title: Predictability of social interactions

abstract:
  The ability to predict social interactions between people has profound
applications including targeted marketing and prediction of information
diffusion and disease propagation. Previous work has shown that the location of
an individual at any given time is highly predictable. This study examines the
predictability of social interactions between people to determine whether
interaction patterns are similarly predictable. I find that the locations and
times of interactions for an individual are highly predictable; however, the
other person the individual interacts with is less predictable. Furthermore, I
show that knowledge of the locations and times of interactions has almost no
effect on the predictability of the other person. Finally I demonstrate that a
simple Markov chain model is able to achieve close to the upper bound in terms
of predicting the next person with whom a given individual will interact.


title: Dark energy with gravitational lens time delays

abstract:
  Strong lensing gravitational time delays are a powerful and cost effective
probe of dark energy. Recent studies have shown that a single lens can provide
a distance measurement with 6-7 % accuracy (including random and systematic
uncertainties), provided sufficient data are available to determine the time
delay and reconstruct the gravitational potential of the deflector.
Gravitational-time delays are a low redshift (z~0-2) probe and thus allow one
to break degeneracies in the interpretation of data from higher-redshift probes
like the cosmic microwave background in terms of the dark energy equation of
state. Current studies are limited by the size of the sample of known lensed
quasars, but this situation is about to change. Even in this decade, wide field
imaging surveys are likely to discover thousands of lensed quasars, enabling
the targeted study of ~100 of these systems and resulting in substantial gains
in the dark energy figure of merit. In the next decade, a further order of
magnitude improvement will be possible with the 10000 systems expected to be
detected and measured with LSST and Euclid. To fully exploit these gains, we
identify three priorities. First, support for the development of software
required for the analysis of the data. Second, in this decade, small robotic
telescopes (1-4m in diameter) dedicated to monitoring of lensed quasars will
transform the field by delivering accurate time delays for ~100 systems. Third,
in the 2020's, LSST will deliver 1000's of time delays; the bottleneck will
instead be the aquisition and analysis of high resolution imaging follow-up.
Thus, the top priority for the next decade is to support fast high resolution
imaging capabilities, such as those enabled by the James Webb Space Telescope
and next generation adaptive optics systems on large ground based telescopes.


title:
2D molecular magnets with weak topological invariant magnetic moments:
  Mathematical prediction of targets for chemical synthesis

abstract:
  An open problem in applied mathematics is to predict interesting molecules
which are realistic targets for chemical synthesis. In this paper, we use a
spin Hamiltonian-type model to predict molecular magnets (MMs) with magnetic
moments that are intrinsically robust under random shape deformations to the
molecule. Using the concept of convergence in probability, we show that for MMs
in which all spin centers lie in-plane and all spin center interactions are
ferromagnetic, the total spin of the molecule is a `weak topological invariant'
when the number of spin centers is sufficiently large. By weak topological
invariant, we mean that the total spin of the molecule only depends upon the
arrangement of spin centers in the molecule, and is unlikely to change under
shape deformations to the molecule. Our calculations show that only between 20
and 50 spin centers are necessary for the total spin of these MMs to be a weak
topological invariant. The robustness effect is particularly enhanced for 2D
ferromagnetic MMs that possess a small number of spin rings in the structure.


title:
Regular solutions to a supercritical elliptic problem in exterior
  domains

abstract:
  We consider the supercritical elliptic problem -\Delta u = \lambda e^u,
\lambda > 0, in an exterior domain $\Omega = \mathbb{R}^N \setminus D$ under
zero Dirichlet condition, where D is smooth and bounded in \mathbb{R}^N, N
greater or equal than 3. We prove that, for \lambda small, this problem admits
infinitely many regular solutions.


title: A Model with Chiral Quarks of Electric Charges -4/3 and 5/3

abstract:
  We present a new model based on the SU(3)xSU(2)xU(1) symmetry, in which there
is a new consistent set of chiral fermion fields that renders the model free
from anomalies. The new fermions do not share the usual family structure of the
Standard Model and some of them have exotic electric charges, as the quarks X
and Y with electric charge 5/3 and -4/3, respectively. Interestingly, the model
contains a new heavy neutral lepton which may be a dark matter candidate. Two
Higgs doublets are present in our construction, so that two CP even scalars are
present in the model particle spectrum. One of them is similar to Standard
Model Higgs boson, while the other one couples mainly with the new exotic
fermions. We performed a discovery analysis showing that the 8 TeV LHC can find
the Y quark from single and pair production with masses from 300 GeV up to ~
750 GeV. We also show that the new spectrum does not contribute significantly
to the oblique EW parameters, and that dangerous flavor changing neutral
currents are suppressed. Characteristic signatures from the other new fermions
in the model are also commented.


title: Directional Uncertainty Principle for Quaternion Fourier Transform

abstract:
  This paper derives a new directional uncertainty principle for quaternion
valued functions subject to the quaternion Fourier transformation. This can be
generalized to establish directional uncertainty principles in Clifford
geometric algebras with quaternion subalgebras. We demonstrate this with the
example of a directional spacetime algebra function uncertainty principle
related to multivector wave packets.


title: Misconception in Theory of Quantum Key Distribution -Reply to Renner-

abstract:
  It has been pointed out by Yuen that the security theory of quantum key
distribution(QKD) guided by Shor-Preskill theory has serious defects, in
particular their key rate theory is not correct. Theory groups of QKD tried to
improve several defects. Especially, Renner employed trace distance and quantum
leftover Hash Lemma. However, the present theory encountered a problem of a
quantitative evaluation of security. To cope with it, he uses a wrong
interpretation on the trace distance and its level epsilon_{sec}, and justifies
the unconditional security of own system when epsilon_{sec} is 10^{-6 } ~
10^{-20}. In this paper, we discuss the following problems. What is the origin
of the misconception of the present theory? How does the present theory lead to
the misconception?. To show their process toward the misconception,
Koashi-Preskill's theory which has a typical misconception is examined. A main
point of our comment is that QKD theory ignores the security requirement
against attacker which is necessary to compare whole encryption schemes from
classical to quantum. To clarify it, we emphasize that the trace distance
itself cannot have any operational meaning such as failure probability, and it
is only mathematical tool as a measure of closeness. As a result, it is given
that the security with above values derived from their formulation means
nothing in the general cryptological sense. In addition, I point out that a
comment by Bennett and Riedel on unconditional security of QKD is not correct.
Also, I point out that the experimental systems of groups of Los Alamos,
Toshiba-UK, NICT, and others cannot have security guarantee even in future.


title:
Lipschitz bounds for solutions of quasilinear parabolic equations in one
  space variable

abstract:
  We bound the modulus of continuity of solutions to quasilinear parabolic
equations in one space variable in terms of the initial modulus of continuity
and elapsed time. In particular we characterize those equations for which the
Lipschitz constants of solutions can be bounded in terms of their initial
oscillation and elapsed time.


title: Stochastic Heisenberg limit: Optimal estimation of a fluctuating phase

abstract:
  The ultimate limits to estimating a fluctuating phase imposed on an optical
beam can be found using the recently derived continuous quantum Cramer-Rao
bound. For Gaussian stationary statistics, and a phase spectrum scaling
asymptotically as 1/omega^p with p>1, the minimum mean-square error in any
(single-time) phase estimate scales as N^{-2(p-1)/(p+1)}, where N is the photon
flux. This gives the usual Heisenberg limit for a constant phase (as the limit
p--> infinity) and provides a stochastic Heisenberg limit for fluctuating
phases. For p=2 (Brownian motion), this limit can be attained by phase
tracking.


title:
Representation of Crystallographic Subperiodic Groups by Geometric
  Algebra

abstract:
  We explain how following the representation of 3D crystallographic space
groups in geometric algebra it is further possible to similarly represent the
162 socalled subperiodic groups of crystallography in geometric algebra. We
construct a new compact geometric algebra group representation symbol, which
allows to read off the complete set of geometric algebra generators. For
clarity we moreover state explicitly what generators are chosen. The group
symbols are based on the representation of point groups in geometric algebra by
versors (Clifford group, Lipschitz elements).

categories: cond-mat.mtrl-sci math.GR math.RA math.RT


title: Time-interior gradient estimates for quasilinear parabolic equations

abstract:
  Bounded smooth solutions of the Dirichlet and Neumann problems for a wide
variety of quasilinear parabolic equations, including graphical anisotropic
mean curvature flows, have gradient bounded in terms of oscillation and elapsed
time.


title: Strata of vector spaces of forms in k[x,y] and of rational curves in P^k

abstract:
  Consider the polynomial ring R=k[x,y] over an infinite field k and the
subspace R_j of degree-j homogeneous polynomials. The Grassmanian G=Grass
(R_j,d) parametrizes the vector spaces V in R_j having dimension d. The strata
Grass_H(R_j,d) in G determined by the Hilbert function H=H(R/(V)) or,
equivalently, by the Betti numbers of the algebra R/(V), are locally closed and
irreducible of known dimension. We had previously shown also that they satisfy
a frontier property that the closure of a stratum is its union with lower
strata [I1,I2]. Each stratum corresponds to a partition, and the the poset of
strata under closure is isomorphic to the poset of corresponding partitions in
the Bruhat order. They are coarser than the strata defined by D. Cox, A.
Kustin, C. Polini, and B.Ulrich [CKPU] recently that are determined in part by
singularities of the rational curve determined by V. We explain these results
and give examples to make them more accessible. We also generalize a result of
D. Cox, T. Sederberg and F. Chen [CSC] and another of C. D'Andrea [D]
concerning the dimension and closure of families of parametrized rational
curves from planar to higher dimensional embeddings.


title: Gravitational Waves Bounds in Brane-Worlds

abstract:
  This paper is dedicated to investigate an astrophysical method to obtain the
new dynamics generated by extra dimensions as well as bounds for the brane
tension. Using the modified Einstein equations in the brane with a vanishing
non-local effects, we study the contributions of the modified radiated power by
gravitational waves and the stellar period modified by branes in a binary
system composed by two neutron stars. Finally we propose two lower energy
bounds, using these astrophysical methods.


title: Discrete flavor symmetries in D-brane models

abstract:
  We study the presence of discrete flavor symmetries in D-brane models of
particle physics. By analyzing the compact extra dimensions of these models one
can determine when such symmetries exist both in the context of intersecting
and magnetized D-brane constructions. Our approach allows to distinguish
between approximate and exact discrete symmetries, and it can be applied to
compactification manifolds with continuous isometries or to manifolds that only
contain discrete isometries, like Calabi-Yau three-folds. We analyze in detail
the class of rigid D-branes models based on a Z_2 x Z'_2 toroidal orientifold,
for which the flavor symmetry group is either the dihedral group D_4 or tensor
products of it. We construct explicit Pati-Salam examples in which families
transform in non-Abelian representations of the flavor symmetry group,
constraining Yukawa couplings beyond the effect of massive U(1) D-brane
symmetries.


title:
Comment on 'Repulsive Contact Interactions Make Jammed Particulate
  Systems Inherently Nonharmonic'

abstract:
  In their Letter, Schreck, Bertrand, O'Hern and Shattuck [Phys. Rev. Lett.
107, 078301 (2011)] study nonlinearities in jammed particulate systems that
arise when contacts are altered. They conclude that there is "no harmonic
regime in the large system limit for all compressions" and "at jamming onset
for any system size." Their argument rests on the claim that for finite-range
repulsive potentials, of the form used in studies of jamming, the breaking or
forming of a single contact is sufficient to destroy the linear regime. We
dispute these conclusions and argue that linear response is both justified and
essential for understanding the nature of the jammed solid.


title: MintHint: Automated Synthesis of Repair Hints

abstract:
  Being able to automatically repair programs is an extremely challenging task.
In this paper, we present MintHint, a novel technique for program repair that
is a departure from most of today's approaches. Instead of trying to fully
automate program repair, which is often an unachievable goal, MintHint performs
statistical correlation analysis to identify expressions that are likely to
occur in the repaired code and generates, using pattern-matching based
synthesis, repair hints from these expressions. Intuitively, these hints
suggest how to rectify a faulty statement and help developers find a complete,
actual repair. MintHint can address a variety of common faults, including
incorrect, spurious, and missing expressions.
  We present a user study that shows that developers' productivity can improve
manyfold with the use of repair hints generated by MintHint -- compared to
having only traditional fault localization information. We also apply MintHint
to several faults of a widely used Unix utility program to further assess the
effectiveness of the approach. Our results show that MintHint performs well
even in situations where (1) the repair space searched does not contain the
exact repair, and (2) the operational specification obtained from the test
cases for repair is incomplete or even imprecise.


title: Aberration in proper motions for stars in our Galaxy

abstract:
  Accelerations of both the solar system barycenter (SSB) and stars in the
Milky Way cause a systematic observational effect on the stellar proper
motions, which was first studied in the early 1990s and developed by J.
Kovalevsky (aberration in proper motions, 2003, A&A, 404, 743). This paper
intends to extend that work and aims to estimate the magnitude and significance
of the aberration in proper motions of stars, especially in the region near the
Galactic center. We adopt two models for the Galactic rotation curve to
evaluate the aberrational effect on the Galactic plane. Based on the
theoretical developments, we show that the effect of aberration in proper
motions depends on the galactocentric distance of stars; it is dominated by the
acceleration of stars in the central region of the Galaxy. Within 200 pc from
the Galactic center, the systematic proper motion can reach an amplitude larger
than 1000 uas/yr by applying a flat rotation curve. With a more realistic
rotation curve which is linearly rising in the core region of the Galaxy, the
aberrational proper motions are limited up to about 150 uas/yr. Then we
investigate the applicability of the theoretical expressions concerning the
aberrational proper motions, especially for those stars with short period
orbits. If the orbital period of stars is only a fraction of the light time
from the star to the SSB, the expression proposed by Kovalevsky is not
appropriate. With a more suitable formulation, we found that the aberration has
no effect on the determination of the stellar orbits on the celestial sphere.
The aberrational effect under consideration is small but not negligible with
high-accurate astrometry in the future, particularly in constructing the Gaia
celestial reference system realized by Galactic stars.


title: Can Research be Taught?

abstract:
  The word 'researcher' is loaded and often confusing. It takes years to become
one and to master all of its aspects. In this paper, we investigate whether or
not this process of 'becoming' can be catalyzed through education. The focus
will be on wireless communications, though the same principle could very well
be replicated to other disciplines.


title: Revisiting the interacting model of new agegraphic dark energy

abstract:
  In this paper, a new version of the interacting model of new agegraphic dark
energy (INADE) is proposed and analyzed in detail. The interaction between dark
energy and dark matter is reconsidered. The interaction term $Q=bH_0\rho_{\rm
de}^\alpha\rho_{\rm dm}^{1-\alpha}$ is adopted, which abandons the Hubble
expansion rate $H$ and involves both $\rho_{\rm de}$ and $\rho_{\rm dm}$.
Moreover, the new initial condition for the agegraphic dark energy is used,
which solves the problem of accommodating baryon matter and radiation in the
model. The solution of the model can be given using an iterative algorithm. A
concrete example for the calculation of the model is given. Furthermore, the
model is constrained by using the combined Planck data (Planck+BAO+SNIa+$H_0$)
and the combined WMAP-9 data (WMAP+BAO+SNIa+$H_0$). Three typical cases are
considered: (A) $Q=bH_0\rho_{\rm de}$, (B) $Q=bH_0\sqrt{\rho_{\rm de}\rho_{\rm
dm}}$, and (C) $Q=bH_0\rho_{\rm dm}$, which correspond to $\alpha=1$, 1/2, and
0, respectively. The departures of the models from the $\Lambda$CDM model are
measured by the $\Delta$BIC and $\Delta$AIC values. It is shown that the INADE
model is better than the NADE model in the fit, and the INADE(A) model is the
best in fitting data among the three cases.


title:
Coinvariant algebras and fake degrees for spin Weyl groups of
  exceptional type

abstract:
  We compute all the spin fake degrees for the exceptional Weyl groups, which
are by definition the graded multiplicities of the simple modules of a spin
Weyl group in its spin coinvariant algebra. The spin fake degrees are all shown
to be palindromic polynomials.


title: Invisible decays of the lightest Higgs boson in supersymmetric models

abstract:
  We consider supersymmetric models in which the lightest Higgs scalar can
decay invisibly consistent with the constraints on the $126$~GeV state
discovered at the CERN LHC. We consider the invisible decay in the minimal
supersymmetric standard model~(MSSM), as well its extension containing an
additional chiral singlet superfield, the so-called next-to-minimal or
nonminimal supersymmetric standard model~(NMSSM).We consider the case of MSSM
with both universal as well as nonuniversal gaugino masses at the grand unified
scale, and find that only an $E_6$ grand unified model with unnaturally large
representation can give rise to sufficiently light neutralinos which can
possibly lead to the invisible decay $h^0 \rightarrow \tilde \chi_1^0 \tilde
\chi_1^0$. Following this, we consider the case of NMSSM in detail, where also
we find that it is not possible to have the invisible decay of the lightest
Higgs scalar with universal gaugino masses at the grand unified scale. We
delineate the regions of the NMSSM parameter space where it is possible to have
the lightest Higgs boson to have a mass of about $126$ GeV, and then
concentrate on the region where this Higgs can decay into light neutralinos,
with the soft gaugino masses $M_1$ and $M_2$ as two independent parameters,
unconstrained by grand unification. We also consider, simultaneously, the other
important invisible Higgs decay channel in the NMSSM, namely the decay into the
lightest CP odd scalars, $h_1 \to a_1 a_1$, which is studied in detail. With
the invisible Higgs branching ratio being constrained by the present LHC
results, we find that $\mu_{eff} < 170$~GeV and $M_1 < 80$~GeV is disfavored in
NMSSM for fixed values of the other input parameters. The dependence of our
results on the parameters of NMSSM is discussed in detail.


title:
Favourable modules: Filtrations, polytopes, Newton-Okounkov bodies and
  flat degenerations

abstract:
  We introduce the notion of a favourable module for a complex unipotent
algebraic group, whose properties are governed by the combinatorics of an
associated polytope. We describe two filtrations of the module, one given by
the total degree on the PBW basis of the corresponding Lie algebra, the other
by fixing a homogeneous monomial order on the PBW basis.
  In the favourable case a basis of the module is parameterized by the lattice
points of a normal polytope. The filtrations induce flat degenerations of the
corresponding flag variety to its abelianized version and to a toric variety,
the special fibres of the degenerations being projectively normal and
arithmetically Cohen-Macaulay. The polytope itself can be recovered as a
Newton-Okounkov body. We conclude the paper by giving classes of examples for
favourable modules.


title:
Nondefective secant varieties of varieties of completely decomposable
  forms

abstract:
  A variation of Waring's problem from classical number theory is the question,
``What is the smallest number $s$ such that any generic homogeneous polynomial
of degree $d$ in $n+1$ variables may be written as the sum of at most $s$
products of linear forms?'' This question may be answered geometrically by
determining the smallest $s$ such that the $s$\nth secant variety of the
variety of completely decomposable forms fills the ambient space. If this
secant variety has the expected dimension, it is called nondefective, and
$s=\left\lceil\binom{n+d}{d}/(dn+1)\right\rceil$. It is conjectured that the
secant variety is always nondefective unless $d=2$ and $2\leq
s\leq\frac{n}{2}$. We prove several special cases of this conjecture. In
particular, we define functions $s_1$ and $s_2$ such that the secant variety is
nondefective when $n\geq 3$ and $s\leq s_1(d)$ or when $n=3$ and $s\geq s_2(d)$
and a function $c$ such that the secant variety is nondefective when $d\geq
n\geq 4$ and $s\leq 2^{n-3}c(n,d)$. We further show that the secant variety is
nondefective when $s\leq 30$ unless $d=2$ and $2\leq s\leq\frac{n}{2}$.


title:
Asymptotic inferences for an AR(1) model with a change point: stationary
  and nearly non-stationary cases

abstract:
  This paper examines the asymptotic inference for AR(1) models with a possible
structural break in the AR parameter $\beta $ near the unity at an unknown time
$k_{0}$. Consider the model $y_{t}=\beta_{1}y_{t-1}I\{t\leq k_{0}\}+\beta
_{2}y_{t-1}I\{t>k_{0}\}+\varepsilon_{t},~t=1,2,\cdots ,T,$ where $I\{\cdot \}$
denotes the indicator function. We examine two cases: Case (I)
$|\beta_{1}|<1,\beta_{2}=\beta_{2T}=1-c/T$; and case
(II)~$\beta_{1}=\beta_{1T}=1-c/T,|\beta _{2}|<1$, where $c$\ is a fixed
constant, and $\{\varepsilon_{t},t\geq 1\}$\ is a sequence of i.i.d. random
variables which are in the domain of attraction of the normal law with zero
means and possibly infinite variances. We derive the limiting distributions of
the least squares estimators of $\beta_{1}$ and $\beta_{2} $, and that of the
break-point estimator for shrinking break for the aforementioned cases. Monte
Carlo simulations are conducted to demonstrate the finite sample properties of
the estimators. Our theoretical results are supported by Monte Carlo
simulations.\newline


title: MathGR: a tensor and GR computation package to keep it simple

abstract:
  We introduce the MathGR package, written in Mathematica. The package can
manipulate tensor and GR calculations with either abstract or explicit indices,
simplify tensors with permutational symmetries, decompose tensors from abstract
indices to partially or completely explicit indices and convert partial
derivatives into total derivatives. Frequently used GR tensors and a model of
FRW universe with ADM type perturbations are predefined. The package is built
around the philosophy to "keep it simple", and makes use of latest tensor
technologies of Mathematica.

categories: cs.MS astro-ph.CO gr-qc hep-th physics.comp-ph


title:
Standard maximum likelihood drift parameter estimator in the homogeneous
  diffusion model is always strongly consistent

abstract:
  We consider the homogeneous stochastic differential equation with unknown
parameter to be estimated. We prove that the standard maximum likelihood
estimate is strongly consistent under very mild conditions. There are also
established the conditions for strong consistency of the discretized estimator.


title:
On the distribution of local times and integral functionals of a
  homogeneous diffusion process

abstract:
  In this article we study a homogeneous transient diffusion process $X$. We
combine the theories of differential equations and of stochastic processes to
obtain new results for homogeneous diffusion processes, generalizing the
results of Salminen and Yor. The distribution of local time of $X$ is found in
a closed form. To this end, a second order differential equation corresponding
to the generator of $X$ is considered, and properties of its monotone solutions
as functions of a parameter are established using their probabilistic
representations. We also provide expressions and upper bounds for moments,
exponential moments, and potentials of integral functionals of $X$.


title:
Multiclass Semi-Supervised Learning on Graphs using Ginzburg-Landau
  Functional Minimization

abstract:
  We present a graph-based variational algorithm for classification of
high-dimensional data, generalizing the binary diffuse interface model to the
case of multiple classes. Motivated by total variation techniques, the method
involves minimizing an energy functional made up of three terms. The first two
terms promote a stepwise continuous classification function with sharp
transitions between classes, while preserving symmetry among the class labels.
The third term is a data fidelity term, allowing us to incorporate prior
information into the model in a semi-supervised framework. The performance of
the algorithm on synthetic data, as well as on the COIL and MNIST benchmark
datasets, is competitive with state-of-the-art graph-based multiclass
segmentation methods.

categories: stat.ML cs.LG math.ST physics.data-an stat.TH


title: A series test of the scaling limit of self-avoiding walks

abstract:
  It is widely believed that the scaling limit of self-avoiding walks (SAWs) at
the critical temperature is (i) conformally invariant, and (ii) describable by
Schramm-Loewner Evolution (SLE) with parameter $\kappa = 8/3.$ We consider SAWs
in a rectangle, which originate at its centre and end when they reach the
boundary. We assume that the scaling limit of SAWs is describable by ${\rm
SLE}_\kappa,$ with the value of $\kappa$ to be determined. It has previously
been shown by Guttmann and Kennedy \cite{GK13} that, in the scaling limit, the
ratio of the probability that a SAW hits the side of the rectangle to the
probability that it hits the end of the rectangle, depends on $\kappa.$ By
considering rectangles of fixed aspect ratio 2, and also rectangles of aspect
ratio 10, we calculate the probabilities exactly for larger and larger
rectangles. By extrapolating this data to infinite rectangle size, we obtain
the estimate $\kappa = 2.66664 \pm 0.00007$ for rectangles of aspect ratio 2
and $\kappa = 2.66675 \pm 0.00015$ for rectangles of aspect ratio 10. We also
provide numerical evidence supporting the conjectured distribution of SAWs
striking the boundary at various points in the case of rectangles with aspect
ratio 2.


title:
Personalized Email Community Detection using Collaborative Similarity
  Measure

abstract:
  Email service providers have employed many email classification and
prioritization systems over the last decade to improve their services. In order
to assist email services, we propose a personalized email community detection
method to discover the groupings of email users based on their structural and
semantic intimacy. We extract the personalized social graph from a set of
emails by uniquely leveraging each node with communication behavior.
Subsequently, collaborative similarity measure (CSM) based intra-graph
clustering approach detects personalized communities. The empirical analysis
shows effectiveness of the resultant communities in terms of evaluation
measures, i.e. density, entropy and f-measure. Moreover, email strainer,
dynamic group prediction, and fraudulent account detection are suggested as the
potential applications from both the service provider and user's point of view.


title: Recognition of Indian Sign Language in Live Video

abstract:
  Sign Language Recognition has emerged as one of the important area of
research in Computer Vision. The difficulty faced by the researchers is that
the instances of signs vary with both motion and appearance. Thus, in this
paper a novel approach for recognizing various alphabets of Indian Sign
Language is proposed where continuous video sequences of the signs have been
considered. The proposed system comprises of three stages: Preprocessing stage,
Feature Extraction and Classification. Preprocessing stage includes skin
filtering, histogram matching. Eigen values and Eigen Vectors were considered
for feature extraction stage and finally Eigen value weighted Euclidean
distance is used to recognize the sign. It deals with bare hands, thus allowing
the user to interact with the system in natural way. We have considered 24
different alphabets in the video sequences and attained a success rate of
96.25%.


title: Designing Run-Time Environments to Have Predefined Global Dynamics

abstract:
  The stability and the predictability of a computer network algorithm's
performance are as important as the main functional purpose of networking
software. However, asserting or deriving such properties from the finite state
machine implementations of protocols is hard and, except for singular cases
like TCP, is not done today. In this paper, we propose to design and study
run-time environments for networking protocols which inherently enforce
desirable, predictable global dynamics. To this end we merge two complementary
design approaches: (i) A design-time and bottom up approach that enables us to
engineer algorithms based on an analyzable (reaction) flow model. (ii) A
run-time and top-down approach based on an autonomous stack composition
framework, which switches among implementation alternatives to find optimal
operation configurations. We demonstrate the feasibility of our self-optimizing
system in both simulations and real-world Internet setups.


title: Scalable Distributed Job Processing with Dynamic Load Balancing

abstract:
  We present here a cost effective framework for a robust scalable and
distributed job processing system that adapts to the dynamic computing needs
easily with efficient load balancing for heterogeneous systems. The design is
such that each of the components are self contained and do not depend on each
other. Yet, they are still interconnected through an enterprise message bus so
as to ensure safe, secure and reliable communication based on transactional
features to avoid duplication as well as data loss. The load balancing,
fault-tolerance and failover recovery are built into the system through a
mechanism of health check facility and a queue based load balancing. The system
has a centralized repository with central monitors to keep track of the
progress of various job executions as well as status of processors in
real-time. The basic requirement of assigning a priority and processing as per
priority is built into the framework. The most important aspect of the
framework is that it avoids the need for job migration by computing the target
processors based on the current load and the various cost factors. The
framework will have the capability to scale horizontally as well as vertically
to achieve the required performance, thus effectively minimizing the total cost
of ownership.


title:
Towards a Simple Relationship to Estimate the Capacity of Static and
  Mobile Wireless Networks

abstract:
  Extensive research has been done on studying the capacity of wireless
multi-hop networks. These efforts have led to many sophisticated and customized
analytical studies on the capacity of particular networks. While most of the
analyses are intellectually challenging, they lack universal properties that
can be extended to study the capacity of a different network. In this paper, we
sift through various capacity-impacting parameters and present a simple
relationship that can be used to estimate the capacity of both static and
mobile networks. Specifically, we show that the network capacity is determined
by the average number of simultaneous transmissions, the link capacity and the
average number of transmissions required to deliver a packet to its
destination. Our result is valid for both finite networks and asymptotically
infinite networks. We then use this result to explain and better understand the
insights of some existing results on the capacity of static networks, mobile
networks and hybrid networks and the multicast capacity. The capacity analysis
using the aforementioned relationship often becomes simpler. The relationship
can be used as a powerful tool to estimate the capacity of different networks.
Our work makes important contributions towards developing a generic methodology
for network capacity analysis that is applicable to a variety of different
scenarios.


title:
Thin disk of co-rotating dwarfs: a fingerprint of dissipative (mirror)
  dark matter?

abstract:
  Recent observations indicate that about half of the dwarf satellite galaxies
around M31 orbit in a thin plane approximately aligned with the Milky Way. It
has been argued that this observation along with several other features can be
explained if these dwarf satellite galaxies originated as tidal dwarf galaxies
formed during an ancient merger event. However if dark matter is collisionless
then tidal dwarf galaxies should be free of dark matter - a condition that is
difficult to reconcile with observations indicating that dwarf satellite
galaxies are dark matter dominated. We argue that dissipative dark matter
candidates, such as mirror dark matter, offer a simple solution to this puzzle.


title:
Decomposition of jet fragmentation function in high-energy heavy-ion
  collisions

abstract:
  Based on a multi-phase transport model, the measured jet fragmentation
function ratio of Pb+Pb collisions to p+p collisions in CERN Large Hadron
Collider experiments is decomposed into two parts, corresponding to the two
contributions of jet hadronization from fragmentation and coalescence. The
results suggest an existence of distinct competitions between two jet
hadronization mechanisms for different $\xi$=ln(1/$z$) ranges in different
centrality bins. The jet fragmentation functions for different types of hadrons
(mesons and baryons) are proposed as a good probe to study the competition
between fragmentation and coalescence for the jet hardonization in high-energy
heavy-ion collisions.


title: Extension of Classical Nucleation Theory for Uniformly Sheared Systems

abstract:
  Nucleation is an out-of-equilibrium process, which can be strongly affected
by the presence of external fields. In this letter, we report a simple
extension of classical nucleation theory to systems submitted to an homogeneous
shear flow. The theory involves accounting for the anisotropy of the critical
nucleus formation, and introduces a shear rate dependent effective temperature.
This extended theory is used to analyze the results of extensive molecular
dynamics simulations, which explore a broad range of shear rates and
undercoolings. At fixed temperature, a maximum in the nucleation rate is
observed, when the relaxation time of the system is comparable to the inverse
shear rate. In contrast to previous studies, our approach does not require a
modification of the thermodynamic description, as the effect of shear is mainly
embodied into a modification of the kinetic prefactor and of the temperature.


title: Phase-Shift Plateaus in the Sagnac Effect for Matter Waves

abstract:
  We simulate ultracold Sagnac atom interferometers using quantum-mechanical
matter wavepackets, e.g. Bose-Einstein condensates, that counter-propagate
within a rotating ring-trap. We find that the accumulation of the relative
phase difference between wavepackets, i.e. the matter wave Sagnac effect, is
manifested as discrete phase jumps. These plateaus result from three effects;
that the atoms should be initially trapped at rest with respect to the rotating
frame, that they counter-propagate with the same group velocities in the
rotating frame, and that the imaging is performed in the rotating frame. We
show that the plateaus persist in the presence of nonlinear atom-atom
interactions, and in atoms undergoing various rotations, and thus will occur
during matter wavepacket experiments. We also introduce the simplest possible
Sagnac atom interferometry scheme which relies on wavepacket dispersion around
a ring-trap.

categories: physics.atom-ph cond-mat.quant-gas nlin.PS quant-ph


title: Strichartz inequality for orthonormal functions

abstract:
  We prove a Strichartz inequality for a system of orthonormal functions, with
an optimal behavior of the constant in the limit of a large number of
functions. The estimate generalizes the usual Strichartz inequality, in the
same fashion as the Lieb-Thirring inequality generalizes the Sobolev
inequality. As an application, we consider the Schr\"odinger equation in a
time-dependent potential and we show the existence of the wave operator in
Schatten spaces.


title: Electromagnetic Lens-focusing Antenna Enabled Massive MIMO

abstract:
  Massive multiple-input multiple-output (MIMO) techniques have been recently
advanced to tremendously improve the performance of wireless networks. However,
the use of very large antenna arrays brings new issues, such as the
significantly increased hardware cost and signal processing cost and
complexity. In order to reap the enormous gain of massive MIMO and yet reduce
its cost to an affordable level, this paper proposes a novel system design by
integrating an electromagnetic (EM) lens with the large antenna array, termed
\emph{electromagnetic lens antenna} (ELA). An ELA has the capability of
focusing the power of any incident plane wave passing through the EM lens to a
small subset of the antenna array, while the location of focal area is
dependent on the angle of arrival (AoA) of the wave. As compared to
conventional antenna arrays without the EM lens, the proposed system can
substantially reduce the number of required radio frequency (RF) chains at the
receiver and hence, the implementation costs. In this paper, we investigate the
proposed system under a simplified single-user uplink transmission setup, by
characterizing the power distribution of the ELA as well as the resulting
channel model. Furthermore, by assuming antenna selection used at the receiver,
we show the throughput gains of the proposed system over conventional antenna
arrays given the same number of selected antennas.


title:
The effective Hamiltonian which governs the propagation dynamics of
  nonspreading wave packets

abstract:
  We discuss the propagation dynamics of nonspreading wave packets. We
decompose the Hamiltonian into two parts. The first part is such that wave
packets is its instantaneous eigenstate and is therefore irrelevant to the
propagation of the packet. The second part is shown to be the effective
Hamiltonian governing the motion of the packet both classically and quantum
mechanically. Thus, analogous to Ehrenfest's theorem, nonspreading wave packets
offer another view point directly connecting quantum mechanics and classical
mechanics. This analysis also works for non-square-integrable packets, such as
Airy packets.


title:
A stochastic recursive optimal control problem under the G-expectation
  framework

abstract:
  In this paper, we study a stochastic recursive optimal control problem in
which the objective functional is described by the solution of a backward
stochastic differential equation driven by G-Brownian motion. Under standard
assumptions, we establish the dynamic programming principle and the related
Hamilton-Jacobi-Bellman (HJB) equation in the framework of G-expectation.
Finally, we show that the value function is the viscosity solution of the
obtained HJB equation.


title: Symmetry results for nonlinear elliptic operators with unbounded drift

abstract:
  We prove the one-dimensional symmetry of solutions to elliptic equations of
the form $-\dive(e^{G(x)}a(|\nabla u|)\nabla u)=f(u) e^{G(x)}$, under suitable
energy conditions. Our results hold without any restriction on the dimension of
the ambient space.


title: Jarnik-type Inequalities

abstract:
  It is well known due to Jarnik that the set Bad of badly approximable numbers
is of Hausdorff-dimension one. If Bad(c) denotes the subset of x in Bad for
which the approximation constant c > c(x), then Jarnik was in fact more precise
and gave nontrivial lower and upper bounds of the Hausdorff-dimension of Bad(c)
in terms of the parameter c > 0. Our aim is to determine simple conditions on a
framework which allow to extend 'Jarnik's inequality' to further examples;
among the applications, we discuss the set of badly approximable vectors in
with weights and the set of geodesics in the hyperbolic space which avoid a
suitable collection of convex sets.


title: Remarks about Mixed Discriminants and Volumes

abstract:
  In this note we prove certain inequalities for mixed discriminants of
positive semi-definite matrices, and mixed volumes of compact convex sets in
n-dimensions. Moreover, we discuss how the latter are related to the
monotonicity of an information functional on the class of convex bodies, which
is a geometric analogue of the classical Fisher information.


title:
Partitioned scheduling of multimode multiprocessor real-time systems
  with temporal isolation

abstract:
  We consider the partitioned scheduling problem of multimode real-time systems
upon identical multiprocessor platforms. During the execution of a multimode
system, the system can change from one mode to another such that the current
task set is replaced with a new one. In this paper, we consider a synchronous
transition protocol in order to take into account mode-independent tasks, i.e.,
tasks of which the execution pattern must not be jeopardized by the mode
changes. We propose two methods for handling mode changes in partitioned
scheduling. The first method is offline/optimal and computes a static
allocation of tasks schedulable and respecting both tasks and transition
deadlines (if any). The second approach is subject to a sufficient condition in
order to ensure online First Fit based allocation to satisfy the timing
constraints.


title:
Existence and Uniqueness of Tronqu\'ee Solutions of the Third and Fourth
  Painlev\'e Equations

abstract:
  It is well-known that the first and second Painlev\'e equations admit
solutions characterised by divergent asymptotic expansions near infinity in
specified sectors of the complex plane. Such solutions are pole-free in these
sectors and called tronqu\'ee solutions by Boutroux. In this paper, we show
that similar solutions exist for the third and fourth Painlev\'e equations as
well.


title: Bayesian nonparametric analysis of reversible Markov chains

abstract:
  We introduce a three-parameter random walk with reinforcement, called the
$(\theta,\alpha,\beta)$ scheme, which generalizes the linearly edge reinforced
random walk to uncountable spaces. The parameter $\beta$ smoothly tunes the
$(\theta,\alpha,\beta)$ scheme between this edge reinforced random walk and the
classical exchangeable two-parameter Hoppe urn scheme, while the parameters
$\alpha$ and $\theta$ modulate how many states are typically visited. Resorting
to de Finetti's theorem for Markov chains, we use the $(\theta,\alpha,\beta)$
scheme to define a nonparametric prior for Bayesian analysis of reversible
Markov chains. The prior is applied in Bayesian nonparametric inference for
species sampling problems with data generated from a reversible Markov chain
with an unknown transition kernel. As a real example, we analyze data from
molecular dynamics simulations of protein folding.


title: Analytical Treatment of Coherent Excitation Transfer in FMO Complex

abstract:
  We suggest a new method of studying coherence in finite level systems coupled
to the environment and use it for the Hamiltonian that has been used to
describe the light-harvesting pigment-protein complex. The method works with
the adiabatic states and transforms the Hamiltonian to a form in which the
terms responsible for decoherence and population relaxation are separated out.
Decoherence is then accounted for non-perturbatively, and population relaxation
using a Markovian master equation. Analytical results can be obtained for the
seven level system and the calculations are very simple for systems with more
levels. We apply the treatment to the seven level system and the results are in
excellent agreement with the exact numerical results of Nalbach et al. (P.
Nalbach, D. Braun, and M. Thorwart, Physical Review E, 84, 041926 (2011)). Our
approach is able to account for decoherence and population relaxation
separately. It is found that decoherence only causes damping of oscillations,
and does not lead to transfer to the reaction centre. Population relaxation is
necessary for efficient transfer to the reaction centre, in agreement with
earlier findings. Our results show that the transformation to the adiabatic
basis followed by a Redfield type of approach leads to results in good
agreement with exact simulation.


title: Optimal discriminating designs for several competing regression models

abstract:
  The problem of constructing optimal discriminating designs for a class of
regression models is considered. We investigate a version of the
$T_p$-optimality criterion as introduced by Atkinson and Fedorov [Biometrika 62
(1975a) 289-303]. The numerical construction of optimal designs is very hard
and challenging, if the number of pairwise comparisons is larger than 2. It is
demonstrated that optimal designs with respect to this type of criteria can be
obtained by solving (nonlinear) vector-valued approximation problems. We use a
characterization of the best approximations to develop an efficient algorithm
for the determination of the optimal discriminating designs. The new procedure
is compared with the currently available methods in several numerical examples,
and we demonstrate that the new method can find optimal discriminating designs
in situations where the currently available procedures fail.


title:
U(1)_{B_1+B_2-2L_1} mediation for the natural SUSY and the anomalous
  muon g-2

abstract:
  We propose a U(1)^\prime mediated supersymmetry (SUSY) breaking, in which
U(1)^\prime is identified with U(1)_{B_1+B_2-2L_1}. The U(1)_{B_1+B_2-2L_1}
gauge symmetry, which is anomaly-free with the field contents of the minimal
supersymmetric standard model, assigns \pm 1/3 charges to the first and second
generations of the quarks, and \mp 2 to the first generation of the leptons. As
a result, the first two generations of squarks acquire masses of about 7 TeV,
and the first generation of the sleptons do those of 40 TeV, respectively, in
the presence of one or three pairs of extra vector-like matter {{\bf
5},\bar{\bf 5}}. Non-observation on extra colored particles below 1 TeV at the
large hadron collider, and also the flavor violations such as \mu^-\rightarrow
e^-\gamma are explained. By virtue of such a gauge symmetry, proton stability
can be protected. The other squarks and sleptons as well as the gauginos can
obtain masses of order 10^{2-3} GeV through the conventional gravity or gauge
mediated SUSY breaking mechanism. The relatively light smuon/sneutrino and the
neutralino/chargino could be responsible for the (g-2)_\mu deviated from the
standard model prediction. The stop mass of \sim 500 GeV relieves the
fine-tuning problem in the Higgs sector. Two-loop effects by the relatively
heavy sfermions can protect the smallness of the stop mass from the radiative
correction by the heavy gluino (\gtrsim 1 TeV). Extra vector-like matter can
enhance the radiative corrections to the Higgs mass up to 126 GeV, and induce
the desired mixing among the chiral fermions after U(1)_{B_1+B_2-2L_1}
breaking.


title:
Asymptotic theory with hierarchical autocorrelation: Ornstein-Uhlenbeck
  tree models

abstract:
  Hierarchical autocorrelation in the error term of linear models arises when
sampling units are related to each other according to a tree. The residual
covariance is parametrized using the tree-distance between sampling units. When
observations are modeled using an Ornstein-Uhlenbeck (OU) process along the
tree, the autocorrelation between two tips decreases exponentially with their
tree distance. These models are most often applied in evolutionary biology,
when tips represent biological species and the OU process parameters represent
the strength and direction of natural selection. For these models, we show that
the mean is not microergodic: no estimator can ever be consistent for this
parameter and provide a lower bound for the variance of its MLE. For covariance
parameters, we give a general sufficient condition ensuring microergodicity.
This condition suggests that some parameters may not be estimated at the same
rate as others. We show that, indeed, maximum likelihood estimators of the
autocorrelation parameter converge at a slower rate than that of generally
microergodic parameters. We showed this theoretically in a symmetric tree
asymptotic framework and through simulations on a large real tree comprising
4507 mammal species.


title:
Verdict Accuracy of Quick Reduct Algorithm using Clustering and
  Classification Techniques for Gene Expression Data

abstract:
  In most gene expression data, the number of training samples is very small
compared to the large number of genes involved in the experiments. However,
among the large amount of genes, only a small fraction is effective for
performing a certain task. Furthermore, a small subset of genes is desirable in
developing gene expression based diagnostic tools for delivering reliable and
understandable results. With the gene selection results, the cost of biological
experiment and decision can be greatly reduced by analyzing only the marker
genes. An important application of gene expression data in functional genomics
is to classify samples according to their gene expression profiles. Feature
selection (FS) is a process which attempts to select more informative features.
It is one of the important steps in knowledge discovery. Conventional
supervised FS methods evaluate various feature subsets using an evaluation
function or metric to select only those features which are related to the
decision classes of the data under consideration. This paper studies a feature
selection method based on rough set theory. Further K-Means, Fuzzy C-Means
(FCM) algorithm have implemented for the reduced feature set without
considering class labels. Then the obtained results are compared with the
original class labels. Back Propagation Network (BPN) has also been used for
classification. Then the performance of K-Means, FCM, and BPN are analyzed
through the confusion matrix. It is found that the BPN is performing well
comparatively.


title:
Relative errors for bootstrap approximations of the serial correlation
  coefficient

abstract:
  We consider the first serial correlation coefficient under an AR(1) model
where errors are not assumed to be Gaussian. In this case it is necessary to
consider bootstrap approximations for tests based on the statistic since the
distribution of errors is unknown. We obtain saddle-point approximations for
tail probabilities of the statistic and its bootstrap version and use these to
show that the bootstrap tail probabilities approximate the true values with
given relative errors, thus extending the classical results of Daniels
[Biometrika 43 (1956) 169-185] for the Gaussian case. The methods require
conditioning on the set of odd numbered observations and suggest a conditional
bootstrap which we show has similar relative error properties.


title: Kinematic Mappings for Cayley-Klein Geometries via Clifford Algebras

abstract:
  This paper unifies the concept of kinematic mappings by using geometric
algebras. We present a method for constructing kinematic mappings for certain
Cayley-Klein geometries. These geometries are described in an algebraic setting
by the homogeneous Clifford algebra model. Displacements correspond to Spin
group elements. After that Spin group elements are mapped to a kinematic image
space. Especially for the group of planar Euclidean displacements SE(2) the
result is the kinematic mapping of Blaschke and Gr\"unwald. For the group of
spatial Euclidean displacements SE(3) the result is Study's mapping.
Furthermore, we classify kinematic mappings for Cayley-Klein spaces of
dimension 2 and 3.


title: Performance analysis of unsupervised feature selection methods

abstract:
  Feature selection (FS) is a process which attempts to select more informative
features. In some cases, too many redundant or irrelevant features may
overpower main features for classification. Feature selection can remedy this
problem and therefore improve the prediction accuracy and reduce the
computational overhead of classification algorithms. The main aim of feature
selection is to determine a minimal feature subset from a problem domain while
retaining a suitably high accuracy in representing the original features. In
this paper, Principal Component Analysis (PCA), Rough PCA, Unsupervised Quick
Reduct (USQR) algorithm and Empirical Distribution Ranking (EDR) approaches are
applied to discover discriminative features that will be the most adequate ones
for classification. Efficiency of the approaches is evaluated using standard
classification metrics.


title: Symmetric Quantum Calculus

abstract:
  We generalize the Hahn variational calculus by studying problems of the
calculus of variations with higher-order derivatives. The symmetric quantum
calculus is studied, namely the $\alpha,\beta$-symmetric, the $q$-symmetric,
and the Hahn symmetric quantum calculus. We introduce the symmetric quantum
variational calculus and an Euler-Lagrange type equation for the $q$-symmetric
and Hahn's symmetric quantum calculus is proved. We define a symmetric
derivative on time scales and derive some of its properties. Finally, we
introduce and study the diamond integral, which is a refined version of the
diamond-$\alpha$ integral on time scales.


title: Optical signatures of the Charge of a Dielectric Particle in a Plasma

abstract:
  With an eye on dust particles immersed into an ionized gas, we study the
effect of a negative charge on the scattering of light by a dielectric particle
with a strong transverse optical phonon resonance in the dielectric constant.
Surplus electrons alter the scattering behavior of the particle by their phonon
limited conductivity in the surface layer (negative electron affinity) or in
the bulk of the particle (positive electron affinity). We identify a
charge-dependent increase of the extinction efficiency for low frequencies, a
shift of the extinction resonance above the transverse optical phonon
frequency, and a rapid variation of the polarization angles over this
resonance. These effects could be used for non-invasive optical measurements of
the charge of the particle.


title:
The Riesz basis property of an indefinite Sturm-Liouville problem with
  non-separated boundary conditions

abstract:
  We consider a regular indefinite Sturm-Liouville eigenvalue problem \{$-f" +
q f = \lambda r f$} on $[a,b]$ subject to general self-adjoint boundary
conditions and with a weight function $r$ which changes its sign at finitely
many, so-called turning points. We give sufficient and in some cases necessary
and sufficient conditions for the Riesz basis property of this eigenvalue
problem. In the case of separated boundary conditions we extend the class of
weight functions $r$ for which the Riesz basis property can be completely
characterized in terms of the local behavior of $r$ in a neighborhood of the
turning points. We identify a class of non-separated boundary conditions for
which, in addition to the local behavior of $r$ in a neighborhood of the
turning points, local conditions on $r$ near the boundary are needed for the
Riesz basis property. As an application, it is shown that the Riesz basis
property for the periodic boundary conditions is closely related to a regular
HELP-type inequality without boundary conditions.


title: Large-Amplitude Superexchange of High-Spin Fermions in Optical Lattices

abstract:
  We show that fermionic high-spin systems with spin-changing collisions allow
to monitor superexchange processes in optical superlattices with large
amplitudes and strong spin fluctuations. By investigating the non-equilibrium
dynamics, we find a superexchange dominated regime at weak interactions. The
underlying mechanism is driven by an emerging tunneling-energy gap in shallow
few-well potentials. As a consequence, the interaction-energy gap that is
expected to occur only for strong interactions in deep lattices is
reestablished. By tuning the optical lattice depth, a crossover between two
regimes with negligible particle number fluctuations is found: first, the
common regime with vanishing spin-fluctuations in deep lattices and, second, a
novel regime with strong spin fluctuations in shallow lattices. We discuss the
possible experimental realization with ultracold 40K atoms and observable
quantities in double wells and two-dimensional plaquettes.


title:
Bound on Noncommutative Standard Model with Hybrid Gauge Transformation
  via Lepton Flavor Conserving $Z$ Decay

abstract:
  The $Z\rightarrow e^{+}e^{-}$ decay is studied basing on the noncommutative
standard model (NCSM) with the hybrid gauge transformation. It is shown that if
the latter is not included, the noncommutative correction to the amplitude of
the $Z\rightarrow e^{+}e^{-}$ appears only as a phase factor, so that there is
no new physical effect on the decay width. However, when the hybrid gauge
transformation is included, the noncommutative effect appears in the two-body
decay process. The discrepancy between the experimental branch ratio and the
standard model prediction allows us to set the bound on the noncommutative
parameters.


title:
An Active Host-Based Intrusion Detection System for ARP-Related Attacks
  and its Verification

abstract:
  Spoofing with falsified IP-MAC pair is the first step in most of the LAN
based-attacks. Address Resolution Protocol (ARP) is stateless, which is the
main cause that makes spoofing possible. Several network level and host level
mechanisms have been proposed to detect and mitigate ARP spoofing but each of
them has their own drawback. In this paper we propose a Host-based Intrusion
Detection system for LAN attacks, which works without any extra constraint like
static IP-MAC, modifying ARP etc. The proposed scheme is verified under all
possible attack scenarios. The scheme is successfully validated in a test bed
with various attack scenarios and the results show the effectiveness of the
proposed technique.


title:
Non-vanishing of Betti numbers of edge ideals and complete bipartite
  subgraphs

abstract:
  Given a finite simple graph one can associate the edge ideal. In this paper
we prove that a graded Betti number of the edge ideal does not vanish if the
original graph contains a set of complete bipartite subgraphs with some
conditions. Also we give a combinatorial description for the projective
dimension of the edge ideals of unmixed bipartite graphs.


title:
Tuple Value Based Multiplicative Data Perturbation Approach To Preserve
  Privacy In Data Stream Mining

abstract:
  Huge volume of data from domain specific applications such as medical,
financial, library, telephone, shopping records and individual are regularly
generated. Sharing of these data is proved to be beneficial for data mining
application. On one hand such data is an important asset to business decision
making by analyzing it. On the other hand data privacy concerns may prevent
data owners from sharing information for data analysis. In order to share data
while preserving privacy, data owner must come up with a solution which
achieves the dual goal of privacy preservation as well as an accuracy of data
mining task - clustering and classification. An efficient and effective
approach has been proposed that aims to protect privacy of sensitive
information and obtaining data clustering with minimum information loss.


title:
A Compact Dual Band Dielectric Resonator Antenna For Wireless
  Applications

abstract:
  This paper presents the design of a dual band rectangular Dielectric
Resonator Antenna (DRA) coupled to narrow slot aperture that is fed by
microstrip line. The fundamental TE111 mode and higher-order TE113 mode are
excited with their resonant frequencies respectively. These frequencies can be
controlled by changing the DRA dimensions. A dielectric resonator with high
permittivity is used to miniaturize the global structure. The proposed antenna
is designed to have dual band operation suitable for both DCS (1710 - 1880 MHz)
and WLAN (2400 - 2484 MHz) applications. The return loss, radiation pattern and
gain of the proposed antenna are evaluated. Reasonable agreement between
simulation and experimental results is obtained.


title: Remarks on the statistical aspects of the safety analysis

abstract:
  We investigate the statistical methods applied throughout safety analysis of
complex systems. The tolerance interval method implemented in the widely
utilized 0.95|0.95 methodology is analyzed. We point out a remarkable weakness
of the tolerance interval method concerning the principle of repeatability. It
is proved that repeating twice the procedure, the probability that the second
maximum will be larger/smaller than the first one is 50\%. This statement is
not surprising, it holds for any random variable with continuous distribution
function. In order to demonstrate the undesirable consequences of the tolerance
interval method in the decision making, the results of the analysis of an
elementary example are discussed. Instead of the tolerance interval method, we
suggest another method based on the sign test which has more encouraging
features, especially in the case of several output variables. The problematic
aspects of the method are also discussed. Finally, we suggest a simple test
case which is able to reveal if the tolerance interval method would not be
capable of determining the risky states of the system, when there are only a
few of them. If there are many, then the method may not explore each one in the
analysis.


title: Reaction $e^+e^-\to\bar DD$ and $\psi'$ mesons

abstract:
  We study the reaction $e^+e^-\to\bar DD$ near threshold in the $^3P_0$
non-relativistic quark model, including as intermediate states the $J/\psi$,
$\psi(2S)$, $\psi(3770)$ and $\psi(4040)$ mesons. The work reveals that
experimental data strongly favor one of the two $\psi(2S)-\psi(3770)$ mixing
angles derived by fitting to the $e^-e^+$ partial decay widths of the
$\psi(2S)$ and $\psi(3770)$ mesons. The meson $X(3940)$ as well as the
resonance around 3.9 GeV observed by Belle and BaBar Collaborations in the
reaction $e^+e^-\rightarrow \bar DD$ is unlikely to be a $c\bar c$
$I^G(J^{PC})=0^-(1^{--})$ state.


title: Implementation of DYMO routing protocol

abstract:
  Mobile ad hoc networks communicate without any fixed infrastructure or ant
centralized domain. All the nodes are free to move randomly within the network
and share information dynamically. To achieve an efficient routing various
protocols have been developed so far which vary in their nature and have their
own salient properties. In this paper, we have discussed one of the latest
protocols i.e. Dynamic Manet on demand (DYMO) routing Protocol, implemented and
analysed its performance with other similar protocols against different
parameters. Finally a comparison has been presented between all of them.


title:
Hide and seek: placing and finding an optimal tree for thousands of
  homoplasy-rich sequences

abstract:
  Finding optimal evolutionary trees from sequence data is typically an
intractable problem, and there is usually no way of knowing how close to
optimal the best tree from some search truly is. The problem would seem to be
particularly acute when we have many taxa and when that data has high levels of
homoplasy, in which the individual characters require many changes to fit on
the best tree. However, a recent mathematical result has provided a precise
tool to generate a short number of high-homoplasy characters for any given
tree, so that this tree is provably the optimal tree under the maximum
parsimony criterion. This provides, for the first time, a rigorous way to test
tree search algorithms on homoplasy-rich data, where we know in advance what
the `best' tree is. In this short note we consider just one search program
(TNT) but show that it is able to locate the globally optimal tree correctly
for 32,768 taxa, even though the characters in the dataset requires, on
average, 1148 state-changes each to fit on this tree, and the number of
characters is only 57.


title: Certified HLints with Isabelle/HOLCF-Prelude

abstract:
  We present the HOLCF-Prelude, a formalization of a large part of Haskell's
standard prelude in Isabelle/HOLCF. Applying this formalization to the hints
suggested by HLint allows us to certify them formally.


title:
Increasing the imaging capabilities of multimode fibers by exploiting
  the properties of highly scattering media

abstract:
  We present a novel design that exploits the focusing properties of scattering
media to increase the resolution and the working distance of multimode fiber
based imaging devices. Placing a highly scattering medium in front of the
distal tip of the multimode fiber enables the formation of smaller sized foci
at increased working distances away from the fiber tip. We perform a parametric
study of the effect of the working distance and the separation between the
fiber and the scattering medium on the focus size. We experimentally
demonstrate submicron focused spots as far away as 800{\mu}m with 532nm light.


title: Entanglement-based linear-optical qubit amplifier

abstract:
  We propose a linear-optical scheme for an efficient amplification of a
photonic qubit based on interaction of the signal mode with a pair of entangled
ancillae. In contrast to a previous proposal for qubit amplifier by Gisin et
al., [Phys Rev. Lett. 105, 070501 (2010)] the success probability of our device
does not decrease asymptotically to zero with increasing gain. Moreover we show
how the device can be used to restore entanglement deteriorated by transmission
over a lossy channel and calculate the secure key rate for device-independent
quantum key distribution.


title: The User Feedback on SentiWordNet

abstract:
  With the release of SentiWordNet 3.0 the related Web interface has been
restyled and improved in order to allow users to submit feedback on the
SentiWordNet entries, in the form of the suggestion of alternative triplets of
values for an entry. This paper reports on the release of the user feedback
collected so far and on the plans for the future.


title: Calculating the Dissonance of a Chord according to Helmholtz Theory

abstract:
  Following the ideas of von Helmholtz and Plomp-Levelt, an algorithm for
calculating the total dissonance of complex sounds, free from logical
inconsistencies and useful for comparing different chords, is proposed. The
method is tested by comparing different tunings of the same major triad. Some
interesting conclusions from this calculation may be drawn.


title: A Note on Graphs of Linear Rank-Width 1

abstract:
  We prove that a connected graph has linear rank-width 1 if and only if it is
a distance-hereditary graph and its split decomposition tree is a path. An
immediate consequence is that one can decide in linear time whether a graph has
linear rank-width at most 1, and give an obstruction if not. Other immediate
consequences are several characterisations of graphs of linear rank-width 1. In
particular a connected graph has linear rank-width 1 if and only if it is
locally equivalent to a caterpillar if and only if it is a vertex-minor of a
path [O-joung Kwon and Sang-il Oum, Graphs of small rank-width are pivot-minors
of graphs of small tree-width, arxiv:1203.3606] if and only if it does not
contain the co-K_2 graph, the Net graph and the 5-cycle graph as vertex-minors
[Isolde Adler, Arthur M. Farley and Andrzej Proskurowski, Obstructions for
linear rank-width at most 1, arxiv:1106.2533].


title:
Rethinking the Secrecy Outage Formulation: A Secure Transmission Design
  Perspective

abstract:
  This letter studies information-theoretic security without knowing the
eavesdropper's channel fading state. We present an alternative secrecy outage
formulation to measure the probability that message transmissions fail to
achieve perfect secrecy. Using this formulation, we design two transmission
schemes that satisfy the given security requirement while achieving good
throughput performance.


title: Some properties of Faber-Walsh polynomials

abstract:
  Walsh introduced a generalisation of Faber polynomials to certain compact
sets which need not be connected. We derive several equivalent representations
of these Faber-Walsh polynomials, analogous to representations of Faber
polynomials. Some simple asymptotic properties of the Faber-Walsh polynomials
on the complement of the compact set are established. We further show that
suitably normalised Faber-Walsh polynomials are asymptotically optimal
polynomials in the sense of [Eiermann and Niethammer 1983].


title: Critically-rotating accretors and non-conservative evolution in Algols

abstract:
  During the mass-transfer phase in Algol systems, a large amount of mass and
angular momentum are accreted by the gainer star which can be accelerated up to
its critical Keplerian velocity. The fate of the gainer once it reaches this
critical value is unclear. We investigate the orbital and stellar spin
evolution in semi-detached binary systems, specifically for systems with
rapidly rotating accretors. Our aim is to better distinguish between the
different spin-down mechanisms proposed which can consistently explain the slow
rotation observed in Algols' final states and assess the degree of
non-conservatism due to the formation of a hotspot. We use our state-of-the-art
binary evolution code, Binstar, which incorporates a detailed treatment of the
orbital and stellar spin, including all torques due to mass transfer, the
interactions between a star and its accretion disc, tidal effects and magnetic
braking. We also present a new prescription for mass loss due to the formation
of a hotspot based on energy conservation. The coupling between the star and
the disc via the boundary layer prevents the gainer from exceeding the critical
rotation. Magnetic-field effects, although operating, are not the dominant
spin-down mechanism for sensible field strengths. Spin down owing to tides is
2-4 orders of magnitudes too weak to compensate the spinning-up torque due to
mass accretion. Moreover, we find that the final separation strongly depends on
the spin-down mechanism. The formation of a hotspot leads to a large event of
mass loss during the rapid phase of mass transfer. The degree of conservatism
strongly depends on the opacity of the impacted material. A statistical study
as well as new observational constraints are needed to find the optimal set of
parameters (magnetic-field strength, hotspot geometry,...) to reproduce Algol
evolutions.


title:
Surface plasmons mediated energy transfer from a semiconductor quantum
  well to an organic overlayer

abstract:
  We consider the resonant energy transfer from a two-dimensional Wannier
exciton (donor) to a Frenkel exciton of a molecular crystal overlayer
(acceptor) when the active medias are separated by a metallic layer, possibly
an electrode. We characterize the effect of the surface plasmon on this
process. Using realistic values of material parameters, we show that it is
possible to change the transfer rate within typically a factor of 5 (up to 44
according to geometrical configuration). We then take into account the
quenching of the organic luminescence due to the proximity with the metal. This
latter is significant and affect negatively the total internal efficiency that
we discuss for different geometries.

categories: cond-mat.mes-hall cond-mat.mtrl-sci cond-mat.other physics.optics


title:
Diffusion map for clustering fMRI spatial maps extracted by independent
  component analysis

abstract:
  Functional magnetic resonance imaging (fMRI) produces data about activity
inside the brain, from which spatial maps can be extracted by independent
component analysis (ICA). In datasets, there are n spatial maps that contain p
voxels. The number of voxels is very high compared to the number of analyzed
spatial maps. Clustering of the spatial maps is usually based on correlation
matrices. This usually works well, although such a similarity matrix inherently
can explain only a certain amount of the total variance contained in the
high-dimensional data where n is relatively small but p is large. For
high-dimensional space, it is reasonable to perform dimensionality reduction
before clustering. In this research, we used the recently developed diffusion
map for dimensionality reduction in conjunction with spectral clustering. This
research revealed that the diffusion map based clustering worked as well as the
more traditional methods, and produced more compact clusters when needed.


title:
The 4 K outer cryostat for the CUORE experiment: construction and
  quality control

abstract:
  The external shell of the CUORE cryostat is a large cryogen-free system
designed to host the dilution refrigerator and the bolometers of the CUORE
experiment in a low radioactivity environment. The three vessels that form the
outer shell were produced and delivered to the Gran Sasso underground
Laboratories in July 2012. In this paper, we describe the production techniques
and the validation tests done at the production site in 2012.


title: Electrodynamics of BaFe2As2 from infrared measurements under pressure

abstract:
  We report on an infrared study on the undoped compound BaFe2As2 as a function
of both pressure (up to about 10 GPa) at three temperatures (300, 160, and 110
K). The evolution with pressure and temperature of the optical conductivity
shows that, by increasing pressure, the mid-infrared absorptions associated
with magnetic order are lowered while the Drude term increases, indicating the
evolution towards a conventional metallic state. We evaluate the spectral
weight dependence on pressure comparing it to that previously found upon
doping. The whole optical results indicate that lattice modifications can not
be recognized as the only parameter determining the low-energy electrodynamics
in these compounds.


title:
Light transmission through and its complete stoppage in an ultra slow
  wave optical medium

abstract:
  Light Wave transmission -- its compression, amplification, and the optical
energy storage -- in an Ultra Slow Wave Medium (USWM) is studied analytically.
Our phenomenological treatment is based entirely on the continuity equation for
the optical energy flux, and the well known distribution-product property of
Dirac delta-function. The results so obtained provide a clear understanding of
some recent experiments on light transmission and its complete stoppage in an
USWM.
  Keywords : Ultra slow light, stopped light, slow wave medium, EIT.


title:
Inferring the local interstellar spectrum of cosmic ray protons from
  PAMELA data

abstract:
  We take advantage of the cosmic-ray (CR) proton data collected by the PAMELA
detector in several campaigns covering the period 2006-2009 to derive the local
interstellar CR proton spectrum (LIS), outside the solar system. We describe
the propagation of CR protons in the solar system by means of a detailed model
of the charge-sign dependent drifts occurring while CRs diffuse in the
irregular solar magnetic field. We fit PAMELA data for each year of data taking
and find that they are well described by a unique time-independent LIS. We then
discuss the consequences of this LIS on galactic propagation models. We find
that diffusive reacceleration is strongly constrained, thus confirming previous
results derived from different channels.


title:
Energetic and Broad Band Spectral Distribution of Emission from
  Astronomical Jets

abstract:
  Emission from astronomical jets extend over the entire spectral band: from
radio to the TeV gamma-rays. This implies that various radiative processes are
taking place in different regions along jets. Understanding the origin of the
emission is crucial in understanding the physical conditions inside jets, as
well as basic physical questions such as jet launching mechanism, particle
acceleration and jet composition. In this chapter I discuss various radiative
mechanisms, focusing on jets in active galactic nuclei (AGN) and X-ray binaries
(XRB) environment. I discuss various models in use in interpreting the data,
and the insights they provide.


title: Analysis $\ell_1$-recovery with frames and Gaussian measurements

abstract:
  This paper provides novel results for the recovery of signals from
undersampled measurements based on analysis $\ell_1$-minimization, when the
analysis operator is given by a frame. We both provide so-called uniform and
nonuniform recovery guarantees for cosparse (analysis-sparse) signals using
Gaussian random measurement matrices. The nonuniform result relies on a
recovery condition via tangent cones and the uniform recovery guarantee is
based on an analysis version of the null space property. Examining these
conditions for Gaussian random matrices leads to precise bounds on the number
of measurements required for successful recovery. In the special case of
standard sparsity, our result improves a bound due to Rudelson and Vershynin
concerning the exact reconstruction of sparse signals from Gaussian
measurements with respect to the constant and extends it to stability under
passing to approximately sparse signals and to robustness under noise on the
measurements.


title: Fiber-optical switch controlled by a single atom

abstract:
  We demonstrate highly efficient switching of optical signals between two
optical fibers controlled by a single atom. The key element of our experiment
is a whispering-gallery mode bottle microresonator, which is coupled to a
single atom and interfaced by two tapered fiber couplers. Even in the presence
of the coupling fibers, the atom--resonator system reaches the strong coupling
regime of cavity quantum electrodynamics (CQED), leading to a vacuum Rabi
splitting in the excitation spectrum. We systematically investigate the
switching efficiency of our system, i.e., the probability that the CQED
fiber-optical switch redirects the light into the desired output. We obtain a
large redirection efficiency reaching a raw fidelity of more than 60% without
post-selection.


title:
Geometric operations implemented by conformal geometric algebra neural
  nodes

abstract:
  Geometric algebra is an optimal frame work for calculating with vectors. The
geometric algebra of a space includes elements that represent all the its
subspaces (lines, planes, volumes, ...). Conformal geometric algebra expands
this approach to elementary representations of arbitrary points, point pairs,
lines, circles, planes and spheres. Apart from including curved objects,
conformal geometric algebra has an elegant unified quaternion like
representation for all proper and improper Euclidean transformations, including
reflections at spheres, general screw transformations and scaling. Expanding
the concepts of real and complex neurons we arrive at the new powerful concept
of conformal geometric algebra neurons. These neurons can easily take the above
mentioned geometric objects or sets of these objects as inputs and apply a wide
range of geometric transformations via the geometric algebra valued weights.


title: Derived category of filtered objects

abstract:
  For an abelian category C and a filtrant preordered set Lambda, we prove that
the derived category of the quasi-abelian category of filtered objects in C
indexed by Lambda is equivalent to the derived category of the abelian category
of functors from Lambda to C. We apply this result to the study of the category
of filtered modules over a filtered ring in a tensor category.


title: Some properties are not even partially testable

abstract:
  For a property $P$ and a sub-property $P'$, we say that $P$ is $P'$-partially
testable with $q$ queries if there exists an algorithm that distinguishes, with
high probability, inputs in $P'$ from inputs $\epsilon$-far from $P$ by using
$q$ queries. There are natural properties that require many queries to test,
but can be partitioned into a small number of subsets for which they are
partially testable with very few queries.
  We prove the existence of a property $P$ such that the only subsets $P'$ for
which $P$ is $P'$-partially testable are very small. To prove this we introduce
new techniques for proving property testing lower bounds. In addition to
obtaining some broad-brush criteria for non-testability, this implies a lower
bound on the possibility of PCPPs with a sublinear proof. This also implies
lower bounds on MAPs, a notion newly defined by Gur and Rothblum.
  The new techniques rely on analyzing a proposed partial tester. We show that
the queries performed by a tester must, with high probability, query indexes
where a uniformly random member of the sub-property has low entropy. We then
show how one can aggregate the "entropy loss" to deduce that a random choice in
the sub-property must have low entropy, and therefore the sub-property must be
small.
  We develop two techniques for aggregating the entropy loss. A simpler
technique that applies to non-adaptive testers is based on partitioning the
input bits into high query probability parts and parts where there is an
entropy loss when conditioned on the high probability parts. Against adaptive
testers we develop a technique based on constructing a decision tree. The
root-to-leaf paths in this tree rearrange the input into parts where each
exhibits entropy loss when conditioned on the path prefix. This decision tree
is constructed by combining carefully selected decision trees from those used
by the adaptive testing algorithm.


title:
Einstein's physical geometry at play: inertial motion, the boostability
  assumption, the Lorentz transformations, and the so-called conventionality of
  the one-way speed of light

abstract:
  In this work, Einstein's view of geometry as physical geometry is taken into
account in the analysis of diverse issues related to the notions of inertial
motion and inertial reference frame. Einstein's physical geometry enables a
non-conventional view on Euclidean geometry (as the geometry associated to
inertial motion and inertial reference frames) and on the uniform time. Also,
by taking into account the implications of the view of geometry as a physical
geometry, it is presented a critical reassessment of the so-called boostability
assumption (implicit according to Einstein in the formulation of the theory)
and also of 'alternative' derivations of the Lorentz transformations that do
not take into account the so-called 'light postulate'. Finally it is addressed
the issue of the eventual conventionality of the one-way speed of light or,
what is the same, the conventionality of simultaneity (within the same inertial
reference frame). It turns out that it is possible to see the (possible)
conventionality of distant simultaneity as a case of conventionality of
geometry (in Einstein's reinterpretation of Poincar\'e's views). By taking into
account synchronization procedures that do not make reference to light
propagation (which is necessary in the derivation of the Lorentz
transformations without the 'light postulate'), it can be shown that the
synchronization of distant clocks does not need any conventional element. This
implies that the whole of chronogeometry (and because of this the physical part
of the theory) does not have any conventional element in it, and it is a
physical chronogeometry.


title:
Relativistic Coulomb Integrals and Zeilberger's Holonomic Systems
  Approach II

abstract:
  We derive the recurrence relations for relativistic Coulomb integrals
directly from the integral representations with the help of computer algebra
methods. In order to manage the computational complexity of this problem, we
employ holonomic closure properties in a sophisticated way.


title: Potentials for transverse trace-free tensors

abstract:
  In the initial conditions of the $3 + 1$ formalism for numerical relativity,
the transverse and trace-free (TT) part of the extrinsic curvature plays a key
role. We know that TT tensors possess two degrees of freedom per space point.
However, finding an expression for a TT tensor depending on only two scalar
functions is a non-trivial task. Assuming either axial or translational
symmetry, expressions depending on two scalar potentials alone are derived here
for \emph{all} TT tensors in flat $3$-space. In a more general spatial slice,
only one of these potentials is found, the same potential given in
\cite{BakerPuzio} and \cite{Dain}, with the remaining equations reduced to a
partial differential equation, depending on boundary conditions for a solution.
As an exercise, we also derive the potentials which give the Bowen-York
curvature tensor in flat space.


title:
Indistinguishability of Warm Dark Matter, Modified Gravity, and Coupled
  Cold Dark Matter

abstract:
  The current accelerated expansion of our universe could be due to an unknown
energy component with negative pressure (dark energy) or a modification to
general relativity (modified gravity). On the other hand, recently warm dark
matter (WDM) remarkably rose as an alternative of cold dark matter (CDM).
Obviously, it is of interest to distinguish these different types of models. In
fact, many attempts have been made in the literature. However, in the present
work, we show that WDM, modified gravity and coupled CDM form a trinity,
namely, they are indistinguishable by using the cosmological observations of
both cosmic expansion history and growth history. Therefore, to break this
degeneracy, the other complementary probes beyond the ones of cosmic expansion
history and growth history are required.


title: The verification of virtual community members socio-demographic profile

abstract:
  This article considers the current problem of investigation and development
of the method of web-members' socio-demographic characteristics' profile
validation based on analysis of socio-demographic characteristics. The
topicality of the paper is determined by the necessity to identify the
web-community member by means of computer-linguistic analysis of their
information track (all information about web-community members, which posted on
the Internet). The formal model of basic socio-demographic characteristics of
virtual communities' member is formed. The algorithm of these characteristics
verification is developed.


title: Sorting suffixes of a text via its Lyndon Factorization

abstract:
  The process of sorting the suffixes of a text plays a fundamental role in
Text Algorithms. They are used for instance in the constructions of the
Burrows-Wheeler transform and the suffix array, widely used in several fields
of Computer Science. For this reason, several recent researches have been
devoted to finding new strategies to obtain effective methods for such a
sorting. In this paper we introduce a new methodology in which an important
role is played by the Lyndon factorization, so that the local suffixes inside
factors detected by this factorization keep their mutual order when extended to
the suffixes of the whole word. This property suggests a versatile technique
that easily can be adapted to different implementative scenarios.


title: The Slow Flow Model of Dust Efflux in Local Star-Forming Galaxies

abstract:
  We develop a dust efflux model of radiation pressure acting on dust grains
which successfully reproduces the relation between stellar mass, dust opacity
and star formation rate observed in local star-forming galaxies. The dust
content of local star-forming galaxies is set by the competition between the
physical processes of dust production and dust loss in our model. The dust loss
rate is proportional to the dust opacity and star formation rate. Observations
of the relation between stellar mass and star formation rate at several epochs
imply that the majority of local star-forming galaxies are best characterized
as having continuous star formation histories. Dust loss is a consequence of
sustained interaction of dust with the radiation field generated by continuous
star formation. Dust efflux driven by radiation pressure rather than dust
destruction offers a more consistent physical interpretation of the dust loss
mechanism. By comparing our model results with the observed relation between
stellar mass, dust extinction and star formation rate in local star-forming
galaxies we are able to constrain the timescale and magnitude of dust loss. The
timescale of dust loss is long and therefore dust is effluxed in a "Slow Flow".
Dust loss is modest in low mass galaxies but massive galaxies may lose up to
70~80% of their dust over their lifetime. Our Slow Flow model shows that mass
loss driven by dust opacity and star formation may be an important physical
process for understanding normal star-forming galaxy evolution.


title:
Affine transformations of finite vector spaces with large orders or few
  cycles

abstract:
  Let V be a d-dimensional vector space over a field of prime order p. We
classify the affine transformations of V of order at least p^d/4, and apply
this classification to determine the finite primitive permutation groups of
affine type, and of degree n, that contain a permutation of order at least n/4.
Using this result we obtain a classification of finite primitive permutation
groups of affine type containing a permutation with at most four cycles.


title:
Photometric, astrometric, and spectroscopic survey of the old open
  cluster Praesepe

abstract:
  We analysed the wide-field near-infrared survey of the Praesepe cluster
carried out by the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters
Survey (GCS) and released by the Data Release 9 (DR9). We compare our Praesepe
mass function (MF) with the ones of the Pleiades, alpha Per, and the Hyades. We
also present preliminary results of a spectroscopic follow-up for the low mass
members (M=<0.1Msol) in Praesepe, alpha Per and Pleiades using the Optical
System for Imaging and low Resolution Integrated Spectroscopy (OSIRIS) mounted
on the 10.4m Gran Telescopio Canarias (GTC). We also present the optical
spectrum of the first L dwarf in Praesepe.


title:
Giant exchange bias in a single-phase magnet with two magnetic
  sublattices

abstract:
  Exchange bias phenomenon is generally ascribed to the exchange coupling at
the interfaces between ferromagnetic and antiferromagnetic layers. Here, we
propose a bulk form of exchange bias in a single-phase magnet where the
coupling between two magnetic sublattices induces a significant shift of the
coercive field after a field cooling. Our experiments in a complicated magnet
YbFe2O4 demonstrate a giant exchange bias at low temperature when the coupling
between the Yb3+ and Fe2+/Fe3+ sublattices take places. The cooling magnetic
field dependence and the training effect of exchange bias are consistent with
our model. In strong contrast to conventional interfacial exchange bias, this
bulk form of exchange bias can be huge, reaching the order of a few Tesla.


title: Effect of Coordination Number on Nonequilibrium Critical Point

abstract:
  We study the nonequilibrium critical point of the zero temperature random
field Ising model on a triangular lattice and compare it with known results on
honeycomb, square, and simple cubic lattices. We suggest that the coordination
number of the lattice rather than its dimension plays the key role in
determining the universality class of the nonequilibrium critical behavior.
This is discussed in the context of numerical evidence that equilibrium and
nonequilibrium critical points of the zero-temperature random field Ising model
belong to the same universality class. The physics of this curious result is
not fully understood.


title:
Is protein folding problem really a NP-complete one ? First
  investigations

abstract:
  To determine the 3D conformation of proteins is a necessity to understand
their functions or interactions with other molecules. It is commonly admitted
that, when proteins fold from their primary linear structures to their final 3D
conformations, they tend to choose the ones that minimize their free energy. To
find the 3D conformation of a protein knowing its amino acid sequence,
bioinformaticians use various models of different resolutions and artificial
intelligence tools, as the protein folding prediction problem is a NP complete
one. More precisely, to determine the backbone structure of the protein using
the low resolution models (2D HP square and 3D HP cubic), by finding the
conformation that minimize free energy, is intractable exactly. Both the proof
of NP-completeness and the 2D prediction consider that acceptable conformations
have to satisfy a self-avoiding walk (SAW) requirement, as two different amino
acids cannot occupy a same position in the lattice. It is shown in this
document that the SAW requirement considered when proving NP-completeness is
different from the SAW requirement used in various prediction programs, and
that they are different from the real biological requirement. Indeed, the proof
of NP completeness and the predictions in silico consider conformations that
are not possible in practice. Consequences of this fact are investigated in
this research work.


title:
CUDA Based Performance Evaluation of the Computational Efficiency of the
  DCT Image Compression Technique on Both the CPU and GPU

abstract:
  Recent advances in computing such as the massively parallel GPUs (Graphical
Processing Units),coupled with the need to store and deliver large quantities
of digital data especially images, has brought a number of challenges for
Computer Scientists, the research community and other stakeholders. These
challenges, such as prohibitively large costs to manipulate the digital data
amongst others, have been the focus of the research community in recent years
and has led to the investigation of image compression techniques that can
achieve excellent results. One such technique is the Discrete Cosine Transform,
which helps separate an image into parts of differing frequencies and has the
advantage of excellent energy-compaction.
  This paper investigates the use of the Compute Unified Device Architecture
(CUDA) programming model to implement the DCT based Cordic based Loeffler
algorithm for efficient image compression. The computational efficiency is
analyzed and evaluated under both the CPU and GPU. The PSNR (Peak Signal to
Noise Ratio) is used to evaluate image reconstruction quality in this paper.
The results are presented and discussed.


title: Pericenter passage of the gas cloud G2 in the Galactic Center

abstract:
  We have further followed the evolution of the orbital and physical properties
of G2, the object currently falling toward the massive black hole in the
Galactic Center on a near-radial orbit. New, very sensitive data were taken in
April 2013 with NACO and SINFONI at the ESO VLT . The 'head' of G2 continues to
be stretched ever further along the orbit in position-velocity space. A
fraction of its emission appears to be already emerging on the blue-shifted
side of the orbit, past pericenter approach. Ionized gas in the head is now
stretched over more than 15,000 Schwarzschild radii RS around the pericenter of
the orbit, at ~ 2000 RS ~ 20 light hours from the black hole. The pericenter
passage of G2 will be a process stretching over a period of at least one year.
The Brackett-{\gamma} luminosity of the head has been constant over the past 9
years, to within +- 25%, as have the line ratios Brackett-{\gamma} /
Paschen-{\alpha} and Brackett-{\gamma} / Helium-I. We do not see any
significant evidence for deviations of G2's dynamical evolution, due to
hydrodynamical interactions with the hot gas around the black hole, from a
ballistic orbit of an initially compact cloud with moderate velocity
dispersion. The constant luminosity and the increasingly stretched appearance
of the head of G2 in the position-velocity plane, without a central peak, is
not consistent with several proposed models with continuous gas release from an
initially bound zone around a faint star on the same orbit as G2.


title: Renormalization group invariants in neutrino sector

abstract:
  We show renormalization group invariants in neutrino sector. These are found
from a simple analytical discussion of Majorana mass matrix for light
neutrinos. It is shown that the invariants are obtained by taking ratios among
elements of the Majorana neutrino mass matrix. The invariance is independent of
neutrino mass ordering and a parameterization of mixing matrix for the lepton
sector. Parameters in the runnings under renormalization group equations in the
neutrino sector are also analyzed.


title: A proof of Lickorish and Wallace's theorem

abstract:
  In this paper, we give a simple proof of Lickorish and Wallace's theorem,
which states that every closed orientable 3-manifold is obtained by surgery on
some link in 3-sphere.