排序方式: 共有39条查询结果,搜索用时 453 毫秒
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车辆的高速移动,导致频繁地进行呼叫切换,这就使得信道分配成为车联网VANETs( Vehicular Ad Hoc Network)中最受关注的研究热点。为此,提出一种新的信道分配算法,标记为SBC算法。该算法引用信道再使用技术( Channel Reuse Technique)、信道借用( Channel Borrowing),并依据车辆行驶的速度计算发生切换的时间,从而提高服务质量QoS( Quality of Service)。仿真结果表明,提出的SBC算法在呼叫阻塞概率、丢失率和切换时延方面表现良好的性能。 相似文献
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《Arabian Journal of Chemistry》2020,13(2):4111-4125
The extreme nitrate (NO3−) species in drinking water leads to methemoglobinemia (blue baby syndrome) disease in new born toddlers whereas the excess phosphate (PO43−) and NO3− contents lead to the eutrophication (algae growth) problem of water sources. Upto date, the environmental researchers have developing the suitable adsorbent materials for providing NO3− and PO43− free water system. In present study, a low-cost alginate (Alg) assisted kaolin (KN) (AlgKN) composite beads were prepared and utilized for the removal of NO3− and PO43−. To improve the sorption capacity (SC) and stability, Zr4+ ions were coated onto AlgKN to get Zr@AlgKN composite beads which were prepared via., hydrothermal (Hydro) and in situ precipitation (In situ) methods. The hydro assisted Zr@AlgKN composite beads possess an enhanced SC than the in situ assisted adsorbents. In batch scale, the parameters responsible for the adsorption process such as contact time, co-ions, adsorbent dosage, pH, initial ions concentration and temperature were optimized. The adsorbents were characterized by XRD, FTIR, BET, EDAX and SEM analysis. The adsorption experimental data was fitted with isotherms, kinetics and thermodynamic parameters. The regeneration and field applicability study of the Zr@AlgKN composite beads were also investigated. 相似文献
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SystemC:一种新的系统建模语言 总被引:2,自引:1,他引:1
文章介绍了一种国外正在研究的新的系统建模语言SystemC,因其较好地结合了面向对象的设计方法和硬件建模的特点,从而有望解决系统建模和HW/SW协同设计中等一系列问题。 相似文献
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验证重用中的监视器设计 总被引:4,自引:1,他引:3
现代集成电路设计面临着一个困境,一方面是电路设计规模和复杂度的日益增加,另一方面则又面临着来自面市时间的巨大压力。在中等或大规模设计中验证工作往往占总开发工作量的70%以上,缩短验证时间可以有效提高设计的效率。采用基于事务的监视器搭建模块化验证平台,是实现缩短验证时间的有效手段。文中讨论了基于事务的监视器的基本工作原理和设计方法,并介绍了一个具体实例——总线监视器的设计。 相似文献
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A new route for the synthesis of linear and vinyl thioethers has been demonstrated using bare silica nanoparticle as catalyst at room temperature under solvent-free conditions. The catalyst can be reused up to six times without loss of catalytic activity. 相似文献
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A study involving the scope of substrate in the Knoevenagel reaction in an IL medium has been conducted. Reactivity trends favor formation of the condensation product using electron deficient aryl aldehydes. Use of electron rich aldehydes and ketones lead to lower levels of conversion and no measurable amounts of condensation products, respectively. A recycling study confirmed that the reaction medium could be used multiple times affording, with each run, the desired condensation product 1a in excess of 90% conversion. Post-run analyses of the IL documented that the IL medium was unaltered upon reuse. 相似文献
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For industrialised economy of ourdays, remanufacturing represents perhaps the largest unexploited resource and opportunity
for realising a greater growth of the economy in an environmental-conscious manner. The aim of this paper is to investigate
of the impact of remanufacturing in the economy from an economic-efficiency point of view. In static context this phenomenon
was analysed in the literature. We use the multi-sector input–output framework in a dynamic context to study intra-period
relationships of the sectors of economy. We extend the classical dynamic input–output model taking into consideration the
activity of remanufacturing .We try to answer the question, whether the remanufacturing/reuse increases the growth possibility
of an economy. We expose a sufficient condition concerning the effectivity of an economy with remanufacturing. By this evaluation
we analyse a possible sustainable development of the economy on the basis of the product recovery management of industries. 相似文献
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为了满足产品上市时间和功能丰富性的要求,越来越多的先进设计公司开始提高设计的抽象层次进行复杂的DSP硬件设计,从RTL级提高到C/C ,以保持产品的持续领先地位.Mentor Graphics的高层次综合工具(Catapult Synthesis)是第一个综合标准的ANSI C 的产品,它可无误地生成针对ASIC/FPGA的高质量RTL代码,且速度比手工编码的快10-20倍.本文以FIR的实现为例,利用Catapult Synthesi s快速探索不同的设计架构,快速地找到性能、面积和功耗之间折衷的最佳实现方案,使得真正的IP复用成为可能,并以图表方式给出不同约束下的面积、延迟和吞吐率(36、3、1时钟周期)的性能,同时提供了集成的验证和综合流程,极大地提高了设计效率. 相似文献