一种应用于移动医疗的体征参数管理软件的设计

随着通信技术的发展,移动医疗在生活中扮演着越发重要的角色。在体域网及移动健康医疗的基础上,实现一种典型的个人健康监护系统,采用Android平台作为系统协调器,设计开发一种软件可以对传感器采集的体征参数进行管理。通过编程测试证明能够实时将用户的体征参数传输进入An-droid手机并发送至远端服务器,并可保证参数在移动监护终端和远端监护设备间实时、准确地传输,这对体域网的发展有着重要的参考价值。     

舰基空基导弹的综合环境适应性研究

以美军标为基础,从导弹经历的环境历程、双平台环境的相同点和不同点以及每种发射平台各自的环境特点几方面,对舰基空基双平台发射导弹的综合环境适应性进行了研究,并提出了双平台发射导弹所应满足的综合环境适应性要求.     

Extended Pilot‐Based Coding for Lossless Bit Rate Reduction of MPEG Surround

Pilot‐based coding (PBC), which is used for lossless bit rate reduction of audio coding, has been recently proposed for MPEG Surround. We propose extended PBC for further lossless bit rate reduction of MPEG Surround. Extended PBC selects the number of pilots depending on the parameter band number and the type of spatial parameter. It then encodes the pilots and the relevant difference data. Experiments show that extended PBC is more effective than the original PBC, especially for high bit rate modes, with a negligible complexity increase on the decoder side.     

UML在巡航控制系统中的应用

标准建模语言UML是最广泛使用的可视化面向对象系统的建模方法。在后PC时代,越来越多的领域需要嵌入式系统的支持,尤其是在工业控制领域。本文把基于软件领域的UML作为通用和完善的方法引入到嵌入式系统领域,并以一个嵌入式实时系统"汽车巡航控制系统"为例论述了利用UML的各种标准符号进行从需求分析开始,到系统整体设计的一系列工作。     

Fabry-Perot Temperature Sensor for Quasi-Distributed Measurement Utilizing OTDR

A quasi-distributed Fabry-Perot fiber optic temperature sensor array using optical time domain reflectometry （OTDR） technique is presented. The F-P sensor is made by two face to face single-mode optical fibers and their surfaces have been polished. Due to the low reflectivity of the fiber surfaces, the sensor is described as low Fresnel Fabry-Perot interferometer （FPI）. The working principle is analyzed using twobeam optical interference approximation. To measure the temperature, a certain temperature sensitive material is filled in the cavity. The slight changes of the reflective intensity which is induced by the refractive index of the material was caught by OTDR. The length of the cavity is obtained by monitoring the interference spectrum which is used for the setting of the sensor static characteristics within the quasi-linear range. Based on our design, a three point sensor array are fabricated and characterized. The experimental results show that with the temperature increasing from -30℃ to 80℃, the reflectivity increase in a good linear manner. The sensitivity was approximate 0.074 dB℃. For the low transmission loss, more sensors can be integrated.     

Voice over wireless local area network

This paper introduces the special issue on voice over wireless local area networks (VoWLAN), which aim to foster interaction among researchers from both academia and industry in networking, wireless communications, and mobile computing. The special issue includes an article investigating the issue of determining an appropriate pricing strategy for VoWLAN provisioning. Also featured are two articles on polling as a solution for supporting real-time traffic over WLANs and another on media optimization network architecture (MONA).     

掺铈石英闪烁光纤的伽马传感特性研究

提出了基于溶胶-凝胶(Sol-Gel)法制备掺铈石英闪烁光纤,将其作为辐射传感头,搭建了对伽马辐射敏感的光纤传感系统。通过改变溶胶-凝胶中铈元素掺杂浓度,分别拉制出Ce与Si的摩尔分数分别为0.14%和0.22%的闪烁石英光纤。利用137Cs伽马辐射源,研究了闪烁光纤涂覆层、铈元素掺杂浓度及闪烁光纤长度等参量对辐射传感特性的影响。     

LiFePO4 Particles Embedded in Fast Bifunctional Conductor rGO&C@Li3V2(PO4)3 Nanosheets as Cathodes for High‐Performance Li‐Ion Hybrid Capacitors

The sluggish kinetics of Faradaic reactions in bulk electrodes is a significant obstacle to achieve high energy and power density in energy storage devices. Herein, a composite of LiFePO₄ particles trapped in fast bifunctional conductor rGO&C@Li₃V₂(PO₄)₃ nanosheets is prepared through an in situ competitive redox reaction. The composite exhibits extraordinary rate capability (71 mAh g^?1 at 15 A g^?1) and remarkable cycling stability (0.03% decay per cycle over 1000 cycles at 10 A g^?1). Improved extrinsic pseudocapacitive contribution is the origin of fast kinetics, which endows this composite with high energy and power density, since the unique 2D nanosheets and embedded ultrafine LiFePO₄ nanoparticles can shorten the ion and electron diffusion length. Even applied to Li‐ion hybrid capacitors, the obtained devices still achieve high power density of 3.36 kW kg^?1 along with high energy density up to 77.8 Wh kg^?1. Density functional theory computations also validate that the remarkable rate performance is facilitated by the desirable ionic and electronic conductivity of the composite.     

IPTV业务发展及关键影响因素分析

首先介绍了IPTV业务在国内外市场的发展状况,指出IPTV是一项能够调动全球整个IT圈热情的业务,其前景十分看好.进而结合我国国情和市场发展的实际情况,深入分析了影响我国IPTV业务发展的六大关键因素--替代竞争、政策管制、成本与价格、获利点、内容和商业模式.指出IPTV业务要想取得成功,参与各方必须找准自己的位置,做好各自的事情,精诚合作,才能实现共赢.     

大功率半导体激光器驱动电源的设计

设计一种大功率半导体激光器的驱动电源。恒稳电流范围为 0～ 10 A,稳流精度为 1m A,脉冲输出电流频率为 10 KHz,脉冲电流的占空比为 1∶ 10 ,脉冲电流幅值为 0～ 10 A可调