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For a given job , we measure the quality of service provided by an algorithm by the stretch of the job , which is defined as the ratio of the amount of time that the job spends in the system to the processing time of the job . Role assignments , introduced by Everett and Borgatti \ cite { Everett91 } , who called them role colorings , formalize the idea , arising in the theory of social networks , that individuals of the same social role will relate in the same way to individuals playing counterpart roles . This paper focuses on variants of the problem in which time-slot assignment constraints are enforced to model the operation of the equipment placed at the nodes of a SONET ring . The committee concluded that the implicit language was necessary to not allow changes of status for Faculty with Special Appointments , which includes temporary appointments . By encouraging students early to use this USU account , we believe we have the ability to better connect them to their advisors , faculty members , and peer mentors that will be crucial in helping them decide to attend USU . We show an algorithm which achieves anonymous communication with O ( 1 ) amortized communication complexity on each link and low computational complexity . These partners include RollingStone.com , which offers readers one-click access to music including Rolling Stone-branded radio stations and exclusive Rolling Stone Original live performances , and Classmates.com , which allows its users to create rich personal profiles that include links to favorite songs that can be enjoyed and shared with fellow alumni . In reality , however , mobile code runs only in the sanitized environment of the playground , where user files cannot be mounted and from which only limited network connections are accepted by machines in the protected domain . Fortunately for me , in both the cases I have in mind , things did n't turn out as bad as I expected ( in fact , one ended up having very good consequences for me ) .