Worldwide Interoperability for Microwave Access (WiMAX) is a new communication technology that conduits the fissure between fixed and mobile access and offers the same Quality of Service (QoS) to both types of users. Generally, WiMAX is more vulnerable to the inside and outside attacks due to the absence of any clear line of defense. The Mobile Subscriber Stations (MSSs) selected to transfer th...

In a mobile computing environment, efficient allocation of wireless communication channels has a consequential impact on the performance of the system. This paper presents a distributed channel allocation algorithm based on the concept of dynamic channel boundaries. Under this scheme, each mobile service station (MSS) is assigned a contiguous range of channels which is not overlapping with the ...

The importance analysis allows reliability estimation depending on the system structure and its components states. Importance measures quantify the criticality of a particular component. Multi-State System (MSS) is mathematical model in reliability analysis that is used for description system with more than two levels of performance. Multiple-Valued Logic mathematical approach is used for MSS r...

We consider the problem (MSSS) of finding the minimum number of arcs in a spanning strongly connected subgraph of a strongly connected digraph. This problem is NP-hard for general digraphs since it generalizes the hamiltonian cycle problem. We characterize the number of arcs in a minimum spanning strong subgraph for digraphs which are either extended semicomplete or semicomplete bipartite. Our ...

Previous works in IEEE 802.16e power saving mainly focused on standard Type I or Type II power saving class. The limitation of adopting Type I or Type II was discussed in our previous work, and the idea of applying traffic modeling and measurement called Load-Based Power Saving (LBPS) was proposed. The base station in LBPS measures the traffic load and estimates the sleep window size for mobile...

In mobile computing, it is desirable to allow read and write accesses to occur on replicated copies of the file at MH (mobile host) and MSS (mobile service station) to increase availability. However, the read-write conflicts among the copies of the database file are to be detected when MH gets connected to MSS. We present a timestamp based technique for the detection of read-write conflicts for...

The interdependency of information security risks often induces firms to invest inefficiently in information technology security management. Cyberinsurance has been proposed as a promising solution to help firms optimize security spending. However, cyberinsurance is ineffective in addressing the investment inefficiency caused by risk interdependency. In this paper, we examine two alternative ri...

In IEEE 802.16 Mesh a node that has a direct connection to backhaul services outside the Mesh network is termed a Mesh Base Station (MBS). All other nodes of a Mesh network are termed Mesh Subscriber Stations (MSS). The MAC scheme used is TDMA and the resource allocation is in terms of time slots within a frame. The standard neither specifies an algorithm for scheduling of the slots to differen...

We describe a speckle imaging reconstruction code written for very fast image reconstruction on a parallel computing platform such as the IBM SP2. We describe the algorithms used for all stages of image reconstruction and present results of a sensitivity study using data obtained with the Maui Space Surveillance Site 1.6-m telescope.

Spasticity is most commonly defined as an inappropriate, velocity dependent, increase in muscle tonic stretch reflexes, due to the amplified reactivity of motor segments to sensory input. It forms one component of the upper motor neuron syndrome and often leads to muscle stiffness and disability. Spasticity can, therefore, be measured through electrophysiological, biomechanical and clinical eva...