An important technique to reduce the contention on the limited bandwidth of wireless channels between mobile units and base stations is caching frequently accessed data items. In the literature, two approaches were proposed for cache consistency: Stateful and Stateless. In the Stateful approach, the server has to keep information about all the mobile units in its cell. On the other hand, in the...

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Mycoplasma mobile is a bacterium that uses a unique mechanism to glide on solid surfaces at a velocity of up to 4.5 μm/s. Its gliding machinery comprises hundreds of units that generate the force for gliding based on the energy derived from ATP; the units catch and pull sialylated oligosaccharides fixed to solid surfaces. In this study, we measured the stall force of wild-type and mutant strain...

In this work we present the use of a novel language based on Gurevich Abstract State Machiness7] to specify active mobile objects semantics. We focus on the mobility support based on the explicit interaction abstraction between units of speciication. The mobility is expressed by changing the communication topology dynamically. We provide the formal semantics of the new approach and show how the...

VANET is the technology of building a robust Ad-Hoc network between mobile vehicles and each other, besides, between mobile vehicles and roadside units. Throughout the world, there are many national and international projects in governments, industry, and academia devoted to the development of VANET protocols. In this paper I have reviewed the various security protocols used for vehicular ad ho...

Multicast has been an efficient service for applications such as video conferencing, resources discover and service location, etc. Although multicasting is well developed for static hosts, it is hard to harness in the wireless environment where resources are limited such as bandwidth and power of mobile units. This paper presents a novel and efficient multicast algorithm that aims at reducing d...

This paper provides detailed solutions for trust delegation and security protection for medical records in public mobile communication networks. The solutions presented in this paper enable the development of software for mobile devices that can be used by emergency medical units in urgent need of sensitive personal information about unconscious patients. In today’s world, technical improvement...

An ad hoc network is a set of mobile units connected by wireless technologies, making an infrastructureless temporary network. without turning to a central administration. The network topology is unpredictable, dynamic, it may change any time. These topology changes make ad hoc networks challenging to implement routing protocols. In this paper, we study mobility effects on the performance of se...

A simple theory of the diamagnetic anisotropy of noncyclic planar groups of atoms with resonance structures (mobile electrons)leads to the value --5.36 x 10(-6) cm-g-sec electromagnetic units for the molar diamagnetic anisotropy of the peptide group.