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基于遗传算法的自适应网格任务调度方法 总被引:7,自引:0,他引:7
文章提出了一种以资源代理为基础的任务调度方法—GMBSA,该方法先对任务执行时间进行预测,然后运用遗传算法结合多队列Backfilling方法进行任务调度,达到最小化任务执行时间(MinimumExecutionTime)的要求,最终实现网格资源的优化分配。试验中采用Simgrid任务调度模拟器对GMBSA的性能进行了测试,并比较了轻重负载情况下GMBSA,多队列Backfilling和FCFS三种调度方案的性能差异。 相似文献
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城市垃圾发电项目主厂房一般有若干个结构单元组成。通常采用多层钢筋混凝土框排架结构和大跨度钢结构,以及两者混合的联合厂房,框排架结构刚度差异大。文章介绍了地震作用时的协调问题及联合厂房不同材质在地震时的不同反应等设计难点。 相似文献
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Prticle-in-cell(PIC) simulations demonstrated that,when the relativistic magnetron with diffraction output(MDO) is applied with a 410 kV voltage pulse,or when the relativistic magnetron with radial output is applied with a 350 kV voltage pulse,electrons emitted from the cathode with high energy will strike the anode block wall.The emitted secondary electrons and backscattered electrons affect the interaction between electrons and RF fields induced by the operating modes,which decreases the output power in the radial output relativistic magnetron by about 15%(10%for the axial output relativistic magnetron),decreases the anode current by about 5%(5%for the axial output relativistic magnetron),and leads to a decrease of electronic efficiency by 8%(6%for the axial output relativistic magnetron).The peak value of the current formed by secondary and backscattered current equals nearly half of the amplitude of the anode current,which may help the growth of parasitic modes when the applied magnetic field is near the critical magnetic field separating neighboring modes.Thus,mode competition becomes more serious. 相似文献
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甘草酸(GL)是甘草类中药材中的有效成分,将甘草酸转化为单葡萄糖酸甘草次酸(GAMG)可以提高其药物活性并降低生物毒性。离心切取新鲜猪肝脏匀浆中间段溶酶体作为酶催化剂,用胆碱基深共晶溶剂作为反应溶剂进行酶催化水解反应,用紫外-可见分光光度法对反应产物进行分析,比较了两种介质下的反应转化率。 相似文献