A simulation model is presented to analyze and evaluate the performance of VoIP based integrated wireless LAN/WAN with taking into account various voice encoding schemes. The network model was simulated using OPNET Modeler software. Different parameters that indicate the QoS like MOS, jitter, end to end delay, traffic send and traffic received are calculated and analyzed in Wireless LAN/WAN sce...

Synaptic weights for neurons in logic programming can be calculated either by using Hebbian learning or by Wan Abdullah’s method. In other words, Hebbian learning for governing events corresponding to some respective program clauses is equivalent with learning using Wan Abdullah’s method for the same respective program clauses. In this paper we will evaluate experimentally the equivalence betwe...

Recent proposals have shown that database replication providing 1copy-serializability can have excellent performance in LAN environments by using powerful multicast primitives. In this paper, we evaluate whether a similar approach is feasible in WAN environments. We identify the most crucial bottlenecks of the existing protocols, and propose optimizations that alleviate the identified problems....

The Shastra WAN collaborative architecture provides a highly exible infrastructure for sophisticated WAN based collaborative network computing. The architecture is being used to create powerful collaborative scienti c visualization applications that can be used througout the Internet. This document presents an explanation of the architecture describing the exibility of the system, relates the a...

Cheung Sha Wan Dermatology Clinic, 3/F West Kowloon Health Centre, 303 Cheung Sha Wan Road, Kowloon, Hong Kong An 84-year-old Chinese male patient presented with multifocal bluish red papules on the right foot. Skin biopsy showed a nodular vasoformative tumour composing of spindle cells with slit-like spaces. Human herpesvirus (HHV-8) immunostaining was positive. Based on the clinical features,...

J. Bullock, M. Tosun, M. Hettick, Dr. C. M. Sutter-Fella, Prof. A. Javey Department of Electrical Engineering and Computer Sciences University of California Berkeley, CA 94720, USA E-mail: [email protected] J. Bullock, M. Tosun, M. Hettick, Dr. C. M. Sutter-Fella, Prof. A. Javey Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley, CA 94720, USA J. Bullock, P. Zheng, Dr....

Mobility in modern distributed systems is a vital feature though it brings up such problems as unforeseeable disconnections while crossing the boundaries of wireless cells or networks. Due to the limited coverage and the lack of co-operation between different networks, seamless switching between different networks becomes extremely difficult. This paper addresses the problem of accidental or in...

Traditional networked file systems like NFS do not extend to wide-area due to network latency and dynamics introduced in the WAN environment. In this paper we proposed the design of a wide-area networked system called WireFS. WireFS is based on NFS and extends to the WAN environment by introducing a file redirector infrastructure residing between the central file server and clients. The file re...

Bulk data transfer in wide area networks (WAN) requires scalable and high network bandwidth. In this paper, we identify a number of the scalability limitations that affect the full utilization of peak theoretical network bandwidth. In addition, we study and classify different offered approaches to overcome some of the identified limitations and increase network bandwidth among Grid components i...