一种提高无线网络语音通话数量的方法

语音通话(Voice over IP)已经成为无线局域网中的一种重要的应用,并且近年来得到了越来越广泛的关注.分析了无线局域网所能支持的语音通话的最大数量,并在网络仿真器NS2上建立了IEEE 802.11语音通话的仿真模型根据仿真分析结果,提出一种自适应传输间隔接入控制方法,提高了IEEE 802.11无线局域网支持语音通话的数量.在自适应传输间隔接入控制方法中,基站(Base Station)通过监测网络冲突概率,自适应的改变网络中语音通话的传输间隔,使网络始终工作在非饱和状态.仿真实验结果表明,提出的白适应传输间隔接入控制方法不仅能够保证IEEE 802.11无线局域网中语音通话的质量,还可以增加网络所能支持语音通话的数量.     

高性能PCB空心线圈电流互感器用于矿区电力系统的研究

高性能PCB空心线圈电流互感器为大截面结构,而理想空心线圈电流互感器要求为小截面结构。文章通过详细的理论分析和推导,解除了对截面大小的这一限制,得出大截面、高精度的PCB空心线圈电流互感器具有和理想空心线圈电流互感器相同测量原理的结论,为PCB空心线圈电流互感器的优化设计和在矿区电力系统中的应用提供了理论基础。实验研究结果表明,高性能PCB空心线圈电流互感器具有良好的测量精度、参数一致性、优异的工频暂态性能和抗电磁干扰能力,适应矿区的电力环境和电力系统进一步数字化的发展潮流。     

电力变电站温度智能监测网络研究与实现

为实现电力系统变电站的温度场的无人职守智能监测的目的.采用无线传感器网络中典型的ZigBee技术应用于变电站的温度监测,完成了网络硬件节点的研究、设计和实现,满足节点低功耗的要求,在协议栈和通信协议方面,分析了ZigBee技术的节点网络地址分配特点.提出了适应于数据采集的自动路由算法;最后分析了节点功耗、采集时间延时和网络生命周期等性能表现,表明温度场智能监测网络可达到长时间无人值守实时监测的目的.     

舰载武器系统局部故障分析方法与研究

针对舰载电子与武器装备结构复杂、设备数量庞大、分布舱室多、检测点分散不集中等问题,在充分调研论证基础上,以系统局部故障分析研究为切入点,提出适用于舰船武器装备特点的局部故障的分析方法;对系统的局部故障我们采用故障树的方法进行界定,并通过核心路径跟踪技术来确定检测点;采用核心路径在线故障检测方法,有效地节省测试资源,提高测试效率。     

A new optical elasticity resin for mobile LCD modules

Abstract— The display used in current cell phones has an air gap between the cover glass and the liquid‐crystal‐display (LCD) module to prevent the LCD glass from being damaged. Reflections at the boundaries of the air gap cause a reduction in the LCD luminance and contrast. To address this problem, a newly proposed LCD structure has been investigated. The “Super View Resin (SVR),” a transparent elastic resin which improves the shock resistance and visibility of the LCD, has been developed. Filling the air gap between the cover glass and LCD module with a refractive‐index‐matching resin solves the light‐reflection problem inherent in the use of a reinforced cover‐glass lens. Moreover, the elastic filler works as a damper, reducing any external shock, which prevents not only the cover glass and LCD module from being damaged, but also the glass from being shattered when it is broken.     

Digital‐to‐analog converter with gamma correction on glass substrate for TFT‐panel applications

Abstract— Low‐temperature polysilicon (LTPS) technology has a tendency towards integrating all circuits on glass substrate. However, the poly‐Si TFTs suffered poor uniformity with large variations in the device characteristics due to a narrow laser process window for producing large‐grained poly‐Si TFTs. The device variation is a serious problem for circuit realization on the LCD panel, so how to design reliable on‐panel circuits is a challenge for system‐on‐panel (SOP) applications. In this work, a 6‐bit R‐string digital‐to‐analog converter (DAC) with gamma correction on glass substrate for TFT‐panel applications is proposed. The proposed circuit, which is composed of a folded R‐string circuit, a segmented digital decoder, and reordering of the decoding circuit, has been designed and fabricated in a 3‐μm LTPS technology. The area of the new proposed DAC circuit is effectively reduced to about one‐sixth compared to that of the conventional circuit for the same LTPS process.     

新建地方本科院校计算机专业人才培养模式研究

新建地方本科院校应适应经济建设和社会发展对人才培养的要求。针对计算机专业人才培养过程中存在的问题和新建地方本科院校自身的特点,阐述了产学研合作是培养计算机专业应用型人才的重要途径,分析了新建地方本科院校产学研合作中存在的问题,探讨了新建地方本科院校计算机专业开展产学研合作教育的有效方式。     

A constructive approach to minimal realization problem of 2D systems

Unlike in the 1D case, it is not always possible to find a minimal state-space realization for a 2D system except for some particular categories. The purpose of this paper is to explore a constructive approach to the minimal Roesser model realization problem for a class of 2D systems which does not belong to the clarified categories. As one of the main results, a constructive realization procedure is first proposed. Based on the proposed procedure, sufficient conditions and explicit construction for minimal realizations of the considered 2D systems are shown. In addition, possible variations and applications of the obtained results are discussed and illustrative examples are presented.     

大众审美影响下乡土商品运用传统包装的商业价值探析

随着民族文化得到不断的重视和提倡,涌现了一股文化回归的浪潮,具有浓郁淳朴气息的传统包装也越来越多的走向市场,本文基于时代发展的大背景下,结合中国民族的审美特点,以乡土商品运用传统包装为例,试析在大众审美影响下,传统包装所蕴含的商业价值。     

供热自动控制中的室温采集电话的设计与实现

应用于供暖自动控制中的室温采集电话除了具有普通电话机的功能外还具有采集室温的功能.室温采集电话通过公共电话网络,接收到室温采集基站的请求后将温度上传至PC机,构成远程温度采集系统.本文基于普通电话的通话电路用HT95C30P微控制器和温度芯片LM92设计和实现室温采集电话.