无线传感器网络环境感知的节点定位方法

 节点定位是无线传感器网络的关键技术之一,许多应用都跟节点位置息息相关。针对基于RSSI的定位算法测距误差通常较大的问题,提出了一种环境感知的节点定位方法,该方法首先根据导标节点之间的相互关系,将网络覆盖区域划分为若干子区域,然后再通过他们之间的相互协作,分别确定出无线信号在不同子区域环境下具体的传播损耗模型,从而提高测距精度和定位精度。仿真结果表明,该方法能提高测距精度约15%~30%。     

福建电网黑启动恢复过程中空载合闸过电压分析

结合福建电网的实际情况,在黑启动恢复过程中对空载输电线路进行合闸操作时可能出现的过电压进行分析.分析结果表明,在黑启动恢复过程中对空载输电线路进行合闸操作存在过电压的可能,但通过投入并联电抗器等控制措施后过电压问题可以得到解决.     

Feasibility of the Application of Internet in English Writing Teaching

In this article,I would like to focus my attention on the tight relationship between Internet and English Writing Teaching.The development of Internet has already put Internet on an important position in English Teaching.However,there are few researches about the application of Internet in English Writing Teaching.Through an analysis to the existent problems in English Wring Teaching in China,I will discuss the feasibility of the application of Internet in English Writing Teaching.     

开放式机房网上预约系统的设计

随着机房的开放和实践教学体系改革的不断深化,规范化、网络化、智能化管理成为机房管理发展的趋势。本文结合机房实验教学和管理现状,从注重培养学生的动手能力和分析、解决问题的能力,以及创新能力出发,提出了"基础性——设计性——综合性"的机房实验教学体系,设计了开放式机房网上预约系统。该系统采用B/S(Browser/Server,浏览器/服务器)模式,大大简化了客户端的程序安装,提供了统一、友好、简单的操作界面,提高了系统的安全性,降低了系统维护复杂度。     

兵团农业总产值的回归分析

首先利用经典线性回归分析对影响兵团各师农业总产值的几个因素进行分析,通过分析发现回归结果不尽合理.因此先对各师数据进行主成分分析,然后再利用农业总产值关于各个因素的主成分进行回归.得出了满意的结果.     

Improved Minimum Detectable Velocity in Bistatic Space-Based Radar

Single orbit bistatic space-based radar （SBR） is composed of two radars in the same orbit. The characteristics of the clutter Doppler-angle spectrum of a single orbit bistatic SBR show that the slope of the mainbeam clutter spectrum is highly sensitive to the cone angles. Therefore, the minimum detectable velocity of the bistatic system is dependent on the cone angle. Then a new combined working mode of singleorbit bistatic SBR system was developed in which one radar will act as the transmitter and another as the receiver to improve detection performance for all angles. Simulation results by space-time adaptive processing verify the improved detection performance. The new design also reduces the average power of each radar system and the size and weight of the on-board solar array-battery system.     

Low Latency High Throughout Circular Asynchronous FIFO

This paper describes a circular first in first out （FIFO） and its protocols which have a very low latency while still maintaining high throughput. Unlike the existing serial FIFOs based on asynchronous micropipelines, this FIFO＇s cells communicate directly with the input and output ports through a common bus, which effectively eliminates the data movement from the input port to the output port, thereby reducing the latency and the power consumption. Furthermore, the latency does not increase with the number of FIFO stages. Single-track asynchronous protocols are used to simplify the FIFO controller design, with only three C-gates needed in each cell controller, which substantially reduces the area. Simulations with the TSMC 0.25 μm CMOS logic process show that the latency of the 4-stage FIFO is less than 581 ps and the throughput is higher than 2.2 GHz.     

湘赣边界秋收起义若干史实研究

1927年毛泽东部署湘赣边界秋收起义的安源会议的具体时间、会议性质以及工农革命军第一军第一师如何组建、工农革命军第一面军旗何地诞生、毛泽东从安源出发何时赶到铜鼓等史实,一直是史学界颇有争议的问题。本文运用翔实的史料,通过分析考证,对上述史实提出新的见解。     

研训一体 提高校本培训实效性

校本培训是“以校为本”的教师继续教育活动,其实质是“以教师为本”。它以促进教师专业发展、形成学校特色为宗旨,以问题为中心,是学习、研究、实践的统一。校本培训有利于改变教师在培训中的“被动”地位,有效促进教师主动发展。针对当前“校本培训”存在的“低效现象”,必须把校本培训与教师的自主研修结合起来,走研训一体的道路,提高校本培训的实效性。     

浅论负债经营与负债会计

资金是最紧缺的资源之一,负债经营是企业生存的主要方式。深入地分析和认识负债的分类和特征、合理测算负债经营结构、科学把握负债经营的“度”,以及如何降低企业债务,是负债会计的主要问题。