What made you want to look up negative valence? Please tell us where you read or heard it (including the quote, if possible).
WBS is nothing but Work Breakdown Structure. It is mainly used in Project System (PS) module. Tcode: CJ20N. For any project defined we must have atleast one WBS. Within this WBS we can have networks. Networks are nothing but the series of activities. Material are used to perform the activities.
ANSYS HFSS is a Finite Element Analysis tool for simulating full-wave electromagnetic fields. HFSS incorporates finite element, integral equation, and hybrid methods to solve a wide range of microwave, RF and high-speed digital applications.