this paper proposes an optimal power flow (opf) algorithm by direct load control (dlc) programs to optimize the operational cost of smart grids considering various scenarios based on different constraints. the cost function includes active power production cost of available power sources and a novel flexible load curtailment cost associated with dlc programs. the load curtailment cost is based ...

human papilloma virus (hpv) vaccine recently has been added to the iran drug list, decision makers need information beyond that available from rcts to recommend funding for this vaccination program to add it to the national immunization program in iran. modeling and economic studies have addressed some of those information needs in foreign countries. in order to determine the long term benefit ...

magnetic levitation (maglev) is amongst the most advanced technologies that are available to the transportation industries. it has already been noticed by decision makers in many countries around the globe. contrary to such high levels of interest, there are no practical algorithms available to the engineers and/or managers to assist them in analyzing economics of the maglev systems. therefore,...

in this paper, we present a genetic algorithm (ga) for optimization of a multi-mode resource constrained time cost trade off (mrctct) problem. the proposed ga, each activity has several operational modes and each mode identifies a possible executive time and cost of the activity. beyond earlier studies on time-cost trade-off problem, in mrctct problem, resource requirements of each execution mo...

Caching has been used for decades as an effective performance enhancing technique in computer systems, among others. However, the traditional cache replacement algorithms are not easily applicable to WWW applications. Moreover, the frequently used hit-ratio and byte-hit ratio are not appropriate measures in WWW applications, because non-uniformity of the object sizes and non-uniformity cost of ...