基于荧光光谱法的皮肤胆固醇快速无创检测技术

皮肤胆固醇含量可以作为评价动脉粥样硬化的重要指标之一,现有的皮肤胆固醇含量检测主要基于实验室活检进行,缺少快速无创的检测技术和装备。针对以皮肤胆固醇含量为评价指标的动脉粥样硬化的早期快速筛查需求,本文提出了基于荧光光谱法的皮肤胆固醇快速无创检测方法,研发了一种皮肤胆固醇无创检测系统。为了提高测量的准确性和稳定性,该系统对温度引起的检测试剂荧光效率的波动进行了修正。本文结合气相色谱法对测量结果的准确性进行了验证,并通过检测正常人群和动脉粥样硬化高风险人群的皮肤胆固醇含量,明确了该系统的临床应用价值。本文的研究结果表明,462~520 nm波段内的平均荧光强度与温度的相关系数为-0.995(p<0.0001),可据此建立温度校准曲线对由温度差异引起的荧光波动进行修正。校正后,系统测量的皮肤胆固醇含量与气相色谱测量值的相关性显著,相关系数为0.905(p<0.0001)。在动脉粥样硬化高风险人群的筛查实验中,动脉粥样硬化高风险人群和正常人群的皮肤胆固醇检测结果具有显著差异(P=0.0004)。与现有技术相比,基于荧光光谱法的皮肤胆固醇检测技术具有测量快速无创等优势,为大规模开展动脉粥样硬化的早期风险筛查提供了先进技术手段。     

一款基于树莓派的便携式智能灭火器设计

设计了一款基于树莓派的便携式智能灭火器,该设计过程包括采用瓶体模块设计,存储模块设计,远程监测与报警模块设计.其中,瓶体外部采用ABS阻燃材质,内部采用一种用于气溶胶罐的铝合金铝合金;存储模块采用无压存储S型气溶胶的方式;远程监控系统中使用树莓派作为中央控制器,辅以各种传感器采集信息,然后通过外部方式远程传输数据,实现...     

被动冷却系统于混凝土屋顶应用研究进展

在炎热气候条件下,由混凝土结构构成的建筑物往往会有不让人满意的热力学性质,比如说较高的内部温度,特别是没有那些主动的冷却系统。相比于混凝土层屋顶,添加被动冷却系统的屋顶显示了它慢热的时间响应,当热量传递减少时,这是一个理想的性质可以用来控制热的波动。探究多种被动式冷却系统于混凝土建筑的屋顶的应用。     

FHCF: A Simple and Efficient Scheduling Scheme for IEEE 802.11e Wireless LAN

The IEEE 802.11e medium access control (MAC) layer protocol is an emerging standard to support quality of service (QoS) in 802.11 wireless networks. Some recent work shows that the 802.11e hybrid coordination function (HCF) can improve significantly the QoS support in 802.11 networks. A simple HCF referenced scheduler has been proposed in the 802.11e which takes into account the QoS requirements of flows and allocates time to stations on the basis of the mean sending rate. As we show in this paper, this HCF referenced scheduling algorithm is only efficient and works well for flows with strict constant bit rate (CBR) characteristics. However, a lot of real-time applications, such as videoconferencing, have some variations in their packet sizes, sending rates or even have variable bit rate (VBR) characteristics. In this paper we propose FHCF, a simple and efficient scheduling algorithm for 802.11e that aims to be fair for both CBR and VBR flows. FHCF uses queue length estimations to tune its time allocation to mobile stations. We present analytical model evaluations and a set of simulations results, and provide performance comparisons with the 802.11e HCF referenced scheduler. Our performance study indicates that FHCF provides good fairness while supporting bandwidth and delay requirements for a large range of network loads. Pierre Ansel received a multidisciplinary in-depth scientific training in different fields such as Pure and Applied Mathematics, Physics, Mechanics, Computer Science and Economics from the Ecole Polytechnique, Palaiseau, France. Then, he joined the Ecole Nationale Superieure des Telecommunications, Paris, France in 2005 where he went further into electronics, databases, computer network security and high speed networks. He received a multidisciplinary master of sciences degree and an additional master of sciences degree in telecommunications in 2005. He did a summer internship in 2003 in INRIA, Sophia Antipolis, France where he worked on the Quality of Service in 802.11 networks at Planete Group, France. Then in 2004, he joined France Telecom R&D, Issy-les-Moulineaux, France to work on Intranet Security issues. He designed a WiFi security supervision architecture based on WiFi Intrusion Detection Sensors. He is currently a French civil servant and belongs to the French Telecommunications Corps. Qiang Ni received the B.Eng., M.Sc. and Ph.D. degrees from Hua Zhong University of Science and Technology (HUST), Wuhan City, China in 1993, 1996 and 1999 respectively. He is currently a faculty member in the Electronic and Computer Engineering Division,School of Engineering and Design, Brunel University, West London, U.K. Between 2004 and 2005 he was a Senior Researcher at the Hamilton Institute, National University of Ireland, Maynooth. From 1999 to 2001, he was a post-doctoral research fellow in the multimedia and wireless communication laboratory, HUST, China. He visited and conducted research at the wireless and networking group of Microsoft Research Asia Lab during the year of 2000. From Sept. 2001 until may 2004, he was a research staff member at the Planète group of INRIA Sophia Antipolis France. Since 2002, he has been active as a voting member at the IEEE 802.11 wireless LAN standard working group. His current research interests include communication protocol design and performance analysis for wireless networks, cross-layer optimizations, vertical handover and mobility management in mobile wireless networks, and adaptive multimedia transmission over hybrid wired/wireless networks. He has authored /co-authored over 40 international journal/conference papers, book chapters, and standard drafts in this field. He is a member of IEEE. E-mail: Qiang.Ni@ieee.org Thierry Turletti received the M.S. (1990) and the Ph.D. (1995) degrees in computer science both from the University of Nice – Sophia Antipolis, France. He has done his PhD studies in the RODEO group at INRIA Sophia Antipolis. During the year 1995–96, he was a postdoctoral fellow in the Telemedia, Networks and Systems group at LCS, MIT. He is currently a research scientist at the Planete group at INRIA Sophia Antipolis. His research interests include multimedia applications, congestion control and wireless networking. Dr. Turletti currently serves on the Editorial Board of Wireless Communications and Mobile Computing.     

多波段图像融合算法研究及其新发展(Ⅰ)

对多通道、特别针对可见光与长波红外图像像素级融合的各种算法进行了深入的研究,针对工作实际需要,对其均进行了一定的改造和编程调试,对某些算法做了较重大改进,在若干方面提出了自己的具有特色的算法与思想。在此基础上编制了大型程序软件包。     

Correlating mobility with social encounters: distributed localization in sparse mobile networks

Wireless Networks - Most existing connectivity-based localization algorithms require high node density which is unavailable in many large-scale sparse mobile networks. By analyzing large datasets...     

激光与固体透明介质相互作用的力学效应

本文从球体模型出发,研究了激光与固体透明介质相互作用的热弹性应力波激励机理,并进行了实验验证,得到了环氧树脂内部变化的光致热弹性应力波传播速度。     

激光等离子体声波及应用

本文简要介绍了激光等离子体声波的产生机理、特性应用前景。     

10J／0.4ms重复脉冲Nd：YAG激光器

报道了一种频率为１、５、１０和２０ＨＺ,单脉冲能量超过１０Ｊ,脉冲宽度小于０．４ｍｓ,能量外流地４％的重复脉冲Ｎｄ：ＹＡＧ激光器。     

中小型企业会计电算化存在的问题及会计信息化对其影响的分析

中小型企业的会计电算化从发展进程、普及使用情况都与大型企业存在差异,其会计电算化在使用过程中也存在不同于大型企业的问题。忽略会计电算化管理制度、缺乏对会计电算化的认知、电算化软件的选择、内部控制漏洞、缺少复合型会计人才都成为制约会计电算化在中小型企业中规范化使用的原因。而中小型企业在解决这些问题的同时,也应做好应对会计信息化发展的准备,积极应对信息化发展的趋势。