Chain store game based channel allocation in cognitive radio system

In adaptive channel allocation for secondary user(SU) of cognitive radio(CR) system,it is necessary to consider allocation process from the temporal perspective.In this article,a chain store game is modeled to achieve SU's equilibrium state.Due to the computational complexity of solving equilibrium states,the authors explore the correlated equilibrium(CE) by importing signal mechanisms based on time and sequence number.Also,correlated equilibrium based game algorithms are presented.Simulations show that the...     

大型商场建筑能源管理制度的调查与分析——以重庆市为例

通过对重庆市44座大中型商场建筑能耗与能源管理状况的调查,对其能源管理制度水平进行了初步的等级划分,并就其管理中存在的问题及原因进行了分析。同时探讨了商场建筑能耗水平与其能源管理制度之间的关系。     

数值模拟技术预测风机两种摆放方式对冷库堆垛货物的影响

为研究不同风机摆放方式对满载货物冷库气流分布以及堆垛货物温度分布的影响,以实际参观走访的中型冷库(24.3m×21.6m×7.2m)为蓝本,利用多孔介质模型并运用ergun方程对货物侧进行建模,分别建立风机下吹型和对吹型冷库模型,使用fluent软件对模型进行稳态模拟,对比分析两种风机摆放方式对该库及堆垛货物内部气流组织分布的影响。结果发现:下吹风冷库气流在货物区域温度和流速分布均匀,对吹风式冷库在货物区域温度分布并不均匀,气流风机射流末端货物区域存在大片高温区,因而可以得出:在所讨论的冷库中,风机下吹风摆放方式优于冷库风机对吹风摆放方式。     

供配电系统电压暂降的防治

阐述了电压暂降的成因和危害,提出从两个方面防治电压暂降。着重介绍了供配电系统机械储能装置、动态电压调节器、静态电容器、静态补偿器等电压自动补偿措施,可为相关电气设计人员提供参考。     

Conditions for aggregation of CHP plants in the UK electricity market and exploration of plant size

Combined heat and power (CHP) plants with thermal stores may be suitable for sustainable energy production and the accommodation of fluctuating renewable energy sources. At the moment, in the UK, only a few CHP plants have thermal stores. Previous research has shown that thermal stores can improve the economics of CHP plants in the UK under the current market conditions. However, currently, it is only beneficial for CHP plants to sell their electricity to a third party, a Licensed Electricity Supplier, rather than to sell it directly to the power exchange market at prices which are much higher. If CHP plants aggregate, direct access to the power exchange market can become economically viable hence there is the possibility that thermal stores could further improve the economics of CHP plants under an aggregated electricity dispatch. This work firstly explains the conditions under which such plants could aggregate and act as a large power plant in the UK market, and secondly explores the most economic-size of gas engine and thermal store, in the case of aggregation, using energyPRO software and Excel spreadsheets. The work suggests that direct access to the power exchange market can improve the economics of the CHP plants. The highest Net Present Value (NPV), without heat dissipation, for a CHP plant exporting its electricity to the grid for a community heating load of 20 GW h, is more than £5 m, and is obtained for a 6 MW engine with a 28.2 MW h (900 m³) thermal store. The research suggests that such high electricity prices could make even larger plants more profitable than that; however, this can happen only if some of the produced heat is dissipated.     

Chain store game based channel allocation iu cognitive radio system

In adaptive channel allocation for secondary user (SU) of cognitive radio (CR) system, it is necessary to consider allocation process from the temporal perspective. In this article, a chain store game is modeled to achieve SU's equilibrium state. Due to the computational complexity of solving equilibrium states, the authors explore the correlated equilibrium (CE) by importing signal mechanisms based on time and sequence number. Also, correlated equilibrium based game algorithms are presented. Simulations show that these algorithms are superior to other allocation algorithms both in channel utilization and communication time.     

基于实时事务预分析处理的内外存数据交换策略

给出了一种合理的内存数据库存贮结构。基于实时事务具有一定的静态可预报性这一特征，提出了一种基于实时事务预分析处理的内外存数据交换策略，即利用预分析处理提取出关于事务对数据库的存取行为的知识，有预见地进行事务存取数据集的装载（包括数据交换）。这不仅能有效地确保事务在执行过程中没有Ｉ／Ｏ，而且能够最大限度地减小系统开销。     

远程实时监视电路系统的设计

介绍了一种远程实时监视系统的接口电路。主要包括视频切换、视频转换及控制电路等部分，配合相应软件可完成多路视频信号的计算机输入及远程图像传输。具有成本低、实用和多功能处理等特点。     

Why Spatial Planning Often Fails to Control the Spreading Locations of Large Scale Commercial Facilities？

The purpose of this paper is to clarify the mechanism of planning failure on land use control in case of sprawl developments of large scale commercial facilities, which is often seen in many countries. The author demonstrates actual three cases in Japan： a huge commercial development established in the middle of rice field between the two local cities, two huge commercial accumulations established at the opposite fringes of urban area, and many large commercial developments established one by one within the small municipalities surrounding a central city. And by examining the statistical sales amount, the author describes that these huge suburban commercial developments apparently deprived the sales of the downtown. Through analyzing these cases, the author empirically stated that for the motorized local cites, the optimum location of commercial accumulation is no longer the central area of the city but about 15 min away from the center with the smooth accessible arterial road. At last, the author mentions that the ＂planning failure＂ could be occurred if the territory of planning authority and the scale of the development are inconsistent, such as the authority of small municipal government and the large scale commercial facility which impacts beyond the municipal boundary.     

煤矿矿井地质工作的探究

煤矿整个地质工作从矿井建设开始到开采结束,每一个环节都是紧密相连的,在这一个过程中要掌握整个矿井,甚至是整个煤田的构造发育变化规律、煤层的赋存状态、标志层和煤层的层间距及其岩性特征。在这一个过程中的矿井地质工作,是通过做到:1看2对3描4整改5总结的工作流程,这个工作流程同样适用于井下每一次地质变化时的工作。