The need to securely share information on an ad-hoc basis between collaborating entities is increasingly becoming important. We propose a coalition based access control model (CBAC), comprised of three layers: coalition, role and user-object. Our model enables translation of coalition level policies to implementation level access control in a manner similar to that of the layers of the TCP/IP p...

The distributed, heterogeneity, and dynamic nature of the coalition context has raised the need for new advanced technologies. These technologies aim at managing the coalition informational infrastructure, in terms of autonomy, adaptability, and scalability. To achieve this support, Software Agents (SAs) seem to be a promising approach. To develop this approach, different aspects of a coalition...

This paper studies the stability of the coalition government formed in 1993 in Japan, called the Hosokawa government, by using a dynamic coalition formation model presented in Fukuda and Muto [2]. Ono and Muto [6] studied the stability of the same coalition government by applying the static coalition formation model of Hart and Kurz [4], which employed Owen’s [7] coalition value to measure part...

The aim of this paper is to find normative foundations of Approval Voting.In order to show that Approval Voting is the only social choice functionthat satisfies anonymity, neutrality, strategy-proofness and strict mono-tonicity we rely on an intermediate result which relates strategy-proofnessof a social choice function to the properties of Independence of IrrelevantAlte...

This paper compares three collective choice procedures for the provision of excludable public goods under incomplete information. One, serial cost sharing (SCS), is budget balanced, individually rational, anonymous and strategy proof. The other two are bhybridQ procedures: voluntary cost sharing with proportional rebates (PCS) and with no rebates (NR). PCS satisfies all these properties except ...

We take a cross-layer optimization approach to study energy efficient data transport in coalition-based wireless sensor networks, where neighboring nodes are organized into groups to form coalitions and sensor nodes within one coalition carry out cooperative communications. In particular, we investigate two network models: (1) many-to-one sensor networks where data from one coalition are transm...

OBJECTIVE To explore the relationship between polymorphisms of XbaI and MspI loci of apolipoprotein B (ApoB) gene and -75 bp, +83 bp loci of apolipoprotein AI (ApoAI) gene and coronary heart disease (CHD) in Kazaks of Xinjiang Uyghur Autonomous Region, China. METHODS These loci were analyzed by PCR-restriction fragment length polymorphism (PCR-PFLP). Two hundred and five patients with CHD and...

Policy-making is a dynamic process in which policies can be changed in each period but continue in the absence of new legislation. We study a dynamic legislative bargaining game with an endogenous status quo where in each period a dollar is allocated with a proposal voted against the allocation in the previous period. We characterize for any initial status quo a class of simple Markov perfect e...

In coalition formation with self-interested agents both social welfare of the multi-agent system and stability of individual coalitions must be taken into account. However, in large-scale systems with thousands of agents, finding an optimal solution with respect to both metrics is infeasible. In this paper we propose an approach for finding coalition structures with suboptimal social welfare an...