Cognitive radio network (CRN) is growing worldwide that leads such networks area unit tormented by the challenges of efficient spectrum/resource allocation also as lack of spectrum. Economical spectrum allocation technique becomes new analysis problem in use of CRN. A significant challenge to the current new technology is the way to build honest assignment of accessible spectrum to unaccredited...

In a mobile environment, since a mobile user is able to freely move around these cells, an inter service area handoff occurs when a user moves from the service area of one proxy to that of another. Some cache misses may be incurred by inter service area handoffs since the data objects interest may not be cached in the new proxies. To address this problem, we propose in this paper a novel cache ...

A new strategy for allocating area, at layout, for enhancing the soft yield of R-2R ladders is introduced. In contrast to the conventional and convenient approach of allocating equal area to each R/2R bit-slice, the new strategy allocates progressively larger areas to higher-order bits. With this strategy, the INL yield for a fixed total resistor area as determined by local random variations in...

we consider the problem of continuous dynamic berth allocation to containerships in a tidal seaport. in some container ports, low water depth in coastal area causes many restrictions on providing vessel's services. therefore, berth allocation planning for relatively large vessels with high draft is subject to tidal conditions when the vessels are in the access channel as from anchorage are...

This paper offers an approach that could be useful for diverse types of layout problems or even area allocation problems. By this approach there is no need to large number of discrete variables and only by few continues variables large-scale layout problems could be solved in polynomial time. This is resulted from dividing area into discrete and continuous dimensions. Also defining decision var...