In this position paper, we argue that usable privacy and security is a grand challenge that needs more attention from the HCI community. We also discuss benefits to and new challenges for HCI, and use our research experiences to provide a critique of HCI. Usable Privacy and Security: A Grand Challenge for HCI Jason I. Hong Carnegie Mellon University 5000 Forbes Ave, Pittsburgh PA 15213

In this paper we provide three new characterizations of largeness of the core. The first characterization of largeness of the core is based on minimal covers of the grand coalition and associated inequalities. The second characterization shows the relation between the bases that provide core elements of the game and the bases that provide core elements of the games that are obtained from the or...

Requiring that supersymmetric SU(5) and SU(6) grand unifications in the heterotic string theory must have 3 chiral families, adjoint (or higher representation) Higgs fields in the grand unified gauge group, and a non-abelian hidden sector, we construct such string models within the framework of conformal field theory and asymmetric orbifolds. Within this framework, we construct all such string ...