Cooperation systems characterize many emerging environments such as ubiquitous and pervasive systems. Agent based cooperation systems have been proposed in the literature to address challenges of such emerging application environments. A key aspect of such agent based cooperation system is the group situation that changes dynamically and governs the requirements of the cooperation. While indivi...

Given a set of m resources and n tasks, the dynamic capacity acquisition and assignment problem seeks a minimum cost schedule of capacity acquisitions for the resources and the assignment of resources to tasks, over a given planning horizon of T periods. This problem arises, for example, in the integrated planning of locations and capacities of distribution centers (DCs), and the assignment of ...

The dynamic-single-assignment property for shared data accesses can establish data race freedom and determinism in parallel programs. However, memory management is a well known challenge in making dynamic-single-assignment practical, especially when objects can be accessed through tags that can be computed by any step. In this paper, we propose a new memory management approach based on user-spe...

Resources and services are accessible in pervasive computing environments from anywhere and at any time. Also, due to ever-changing nature of such environments, the identity of users is unknown. However, users must be able to access the required resources based on their contexts. These and other similar complexities necessitate dynamic and context-aware access control models for such environmen...

This paper proposes some novel techniques to accommodate users with different transmission rate requirements in a CDMA system which employs orthogonal variable spreading factor codes. Several static and dynamic code assignment strategies are put forth and their behavior investigated, in terms of call blocking probability and number of required call reassignments. Their efficiency in dealing wit...

After a general introduction to the emerging field of network analysis, we will focus on the analysis of group structure in dynamic networks. By defining groups based on similarity of neighborhoods rather than local density, nodes can be associated to roles representing structural positions in a network. A recently proposed relaxation of discrete role assignment allows for varying degrees of me...

Basing on the integration of two models, RBAC and TBAC, an access control model called Role-Task Based Access Control (R&TBAC) is given, which takes two parts as combining sites, one is the role and trustee, the other is the role permission assignment and trustee permissions. A set of fundamental conceptions, a series of authorization processes, a formalized description and some modeling tools ...

This paper studies a novel scalable network architecture combining optical burst switching (OBS) with dynamic wavelength allocation to guarantee quality of service (QoS). All processing and buffering functions are concentrated at the network edge and bursts are assigned to fast tuneable lasers and routed over a bufferless optical transport core using dynamic wavelength assignment. Different bur...

In this paper, we consider task assignment problem in a cluster of servers. We show that optimal static task assignment is tantamount to equalizing an appropriate cost functions associated with the servers. We also propose an improvement of dynamic Shortest Expected Delay (SED) task assignment policy.

This letter presents a cryptographic key assignment scheme for dynamic access control in a hierarchy. A scheme for extending a previous cryptographic key assignment scheme to reduce the computation required for key generation and derivation algorithms is also proposed.