The specification of access control policies for large, multi-organization applications is difficult and error-prone. Sophisticated policies are needed for fine-grained control of access to large numbers of entities, resulting in many policies specified by different security administrators. Techniques such as role based access control (RBAC) have been proposed to group policies and provide a fr...

The management of access control (AC) policies in open distributed systems (ODS), like the Grid, P2P systems, or Virtual Repositories (databases or data grids) can take two extreme approaches. The first extreme approach is a centralized management of the policy (that still allows a distribution of AC policy enforcement). This approach requires a full trust in a central entity that manages the A...

AbstmctThe essence of the basic control decisions implicit in load sharing and routing algorithms is captured in a simple model of heterogeneous queue control. We solve for the optimal control policy and investigate the performance of previously proposed policies in a tractable limit of this model. Using our understanding of this solvable limit, we propose heuristic policies for the general mod...

Nowadays, demand response programs (DRPs) play an important role in price reduction and reliability improvement. In this paper, an optimal integrated model for the emergency demand response program (EDRP) and dynamic economic emission dispatch (DEED) problem has been developed. Customer’s behavior is modeled based on the price elasticity matrix (PEM) by which the level of DRP is determined for ...

Online Social Networks have increased the need to understand well and extend the expressiveness of privacy policies. In particular, the need to be able to define and enforce dynamic (and recurrent) policies that are activated or deactivated by context (events) or timeouts. We propose an automaton-based approach to define and enforce such policies using runtime verification techniques. In this p...

This paper considers the problem of scheduling hybrid flowshops with machine availability constraints (MAC) to minimize makespan. The paper deals with a specific case of MAC caused by preventive maintenance (PM) operations. Contrary to previous papers considering fixed or/and conservative policies, we explore a case in which PM activities might be postponed or expedited while necessary. Regardi...

Hundreds of municipalities and counties across the United States have proposed or implemented immigration policies at the local level, ranging from “sanctuary” policies to those designed to exclude undocumented immigrants. Data collected on these policies are presented, and statistically analyzed at the municipal level to interrogate existing hypotheses about factors driving these policy decisi...

The use of attribute certificates and the concept of mobile policies have been proposed to overcome some of the limitations of the role based access control (RBAC) paradigm and to implement security requirements such as the “originator controlled” (ORCON) policy. Mobile policies are attached to the data that they control and enforced by their execution in trusted servers. In this paper we exten...

OBJECTIVE To review and synthesize existing national and state organizations' policies related to the nutritional quality of snacks served in after-school programmes (ASP; 15.00-18.00 hours) in the USA. DESIGN Systematic review of websites and corresponding documentation describing national and state-level ASP organizations' policies, standards, guidelines and/or recommendations for the nutri...