The explosion of the technology of mesoscopic constructions is having a superb effect on physics and electric engineering as a result attainable purposes of those buildings in microelectronic and optoelectronic units of the long run.

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The main challenge is to design scheduling algorithms that can construct the optimal program that minimizes the average access time. In the second mode, the pull mode, the server delivers information to mobile clients in response to their submitted requests. From the (outstanding) requests, the server determines the next object to be picked for dissemination based on some criterion. The challenge in this case is to design scheduling algorithms that determine the object which can greatly improve the effectiveness of the system when it is picked for broadcasting.

We also suggest promising research topics that deserve further attention. KIAN-LEE TAN & BENG CHIN OOI Page 1 Chapter 1 INTRODUCTION We are living in an increasingly mobile world where people travel from place to place. At the same time, information has become such an important asset that many people are craving after to meet their information needs as well as to confer upon themselves a competitive advantage. Wireless computing is the phenomenon that enables one to receive and disseminate information even when one moves about – it is mobile computing with untethered communications.

However, because of the unique characteristics (or rather limitations) of wireless computing environments, the basic request-response approach is not the most desirable approach to be deployed in such environments. For example, the request-response approach does not scale well in terms of the number of queries/users that can be supported. Instead, a data delivery mechanism should have the following features: Efficient wireless bandwidth utilization. The wireless bandwidth can quickly become congested as the client population increases.

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