"云计算"落地的可喜实践

封面文章<梁念坚漫步云端>(总第217-218期),披露了一个鲜为人知的案例.微软与成郜云计算中心联合开发,于2009年年底建成并投入运营的"猪肉质量安全溯源监管系统",提供了"云计算"技术在一个具体地域、具体行业应用的范例,初显了其对于提高行政效率,节约管理成本,加快信息传播速度,提高信息准确程度,增强公众对于公共事务知晓度和参与度的积极作用.     

继承"昨天"的荣耀成就"明天"的辉煌--记冰箱压缩机行业"十一五"变迁

2010年是我国冰箱压缩机行业历史性的一年,行业产销量双破亿台大关就是最好的明证。作为“十一五”的最后一年,压缩机行业可谓做到了“善终”,同时也给该行业在“十二五”的发展打下了坚实基础。     

After Effects制作"生命的诞生"

电视片头和电视包装的一个共同点就是画面要新颖独特、别具一格,让观众的眼睛为之一亮,其中粒子的运用已经涉及到影视的方方面面,它不仅能点缀画面,也可以作为单独的系统来进行创作.在此,我们用AE的Particular2.0来进行单独创作,和朋友们一起分享.     

林业信息化服务平台"林信通"概述

三明移动公司与以市林业局为主的政府部门结合现有的林业现状及多方的资源优势,率先在全国林业系统中开发"林信通"平台,通过多种创新举措提供一揽子林业信息化服务,将政府、企业、农民有机的融合为一体,打造农民从事农业活动的依赖资讯通道与林业信息共享的最佳渠道,缩小城乡数字鸿沟,加快林业的信息化发展,助力政府推进社会主义新农村建...     

"延时自动同步"音频传输系统在中波同步广播中的应用

本文介绍了基于数字单频网技术的"延时自动同步"音频传输系统的在中波同步广播中的应用.阐述了构建中波同步广播系统的技术要求和实现方法.重点介绍了"延时自动同步"音频传输系统的功能、工作原理以及特点.     

打造"绿色"与"效益"兼备的办公环境

近年来,经济形势日益严峻,迫使全球几乎每一家大型企业都密切关注各项费用和支出。他们在寻求新的成本消减方法,这既要保证不会削弱企业自身的竞争力,又不会影响其向客户提供服务。如今,企业组织推广和开展业务的方式正飞速发展。研究显示,在几乎所有行业中,大多数企业的文档管理成本约占年营收的6%,CFO没意识到这竟会是如此一大笔费用,甚至是熟悉文档管理网络和技术的管理     

为高速数据传输而驿动的"芯"

在大数据和云计算的浪潮之下,高速数据传输技术延续并推进着一个长盛不衰的市场,而基于高速数据传输创新技术芯片在其中扮演着极其重要的角色,抑或是在开拓一系列新颖的应用领域.天津瑞发科公司以独特的USB3.0控制器芯片,支持苹果U盘的市场拓展,又以自主的AVT技术将高速数据传输应用提升到新的高度,从而涵盖网咖电脑集中式机房、车载视觉传输系统、无线高清实时图传,以至于信息安全网络系统,充分显示出本土芯片设计公司的优势.     

希望"美丽的云"不要走上"铱星"的老路

读《IT时代周刊》的《IT巨头眼中的云计算》一文发现,在不同巨头眼中的云计算是有着不同的光彩,但从文中可以看出一点,出身硬件企业的巨头们都在描述着云的美丽,而另一些巨头则描述着云的另一面或憧憬着有云的未来,倪光南老先生也仅仅谈到"云是一种客观趋势"。为什么会有这种分歧?企业利益驱动。     

留在影像中的"马勒"

马勒在生前曾经被认为是音乐史上最伟大的指挥家之一，但是他在世时似乎已经预见到自己作为作曲家的地位，他预言：“我的时代终将来临。”如今，马勒的这一预言果然实现，而导致这一切的因素除开近代以来一批音乐界臣人强有力的不吝推广，还有技术发展的动力。     

"看门狗"技术的实现

1.看门狗概述工业环境中的干扰大多是以窄脉冲的形式出现,而最终造成微机系统故障的多数现象为死机.究其原因是CPU在执行某条指令时,受干扰的冲击,使它的操作码或地址码发生改变,致使该条指令出错.这时,CPU执行随机拼写的指令,甚至将操作数作为操作码执行,导致程序跑飞或进入死循环.为使这种跑飞或进入死循环的程序自动恢复,重...     

<Emphasis Type="Italic">In Situ</Emphasis> Optical Creep Observation of Joint-Scale Tin–Silver–Copper Solder Shear Samples

In this paper the creep behavior of lead-free 96.5Sn-3.0Ag-0.5Cu solder is evaluated. A series of creep tests at different stress/temperature and strain rate/temperature pairs has been conducted. The tests were observed in situ with a high-magnification camera system. Optical observation results are presented from selected tests, showing the occurrence of surface effects such as shear bands, voiding, and rumpling. From these observations the main deformation mechanisms were derived and compiled in terms of their dependence on the test conditions.     

LOOSE PHRASE EXTRACTION WITH n-BEST ALIGNMENTS

Loose phrase extraction method is proposed and applied for phrase-based statistical ma- chine translation. The method extracts phrase pairs that are not strictly consistent with word align- ments. Two types of constraints on word positions are investigated for this method. Furthermore, n-best alignments are introduced for phrase extraction instead of the one-best. Experimental results show that the proposed approach outperforms the baseline system, Pharaoh system, for both one-best and n-best alignments.     

The <Emphasis Type="Italic">Horus</Emphasis> location determination system

We present the design and implementation of the Horus WLAN location determination system. The design of the Horus system aims at satisfying two goals: high accuracy and low computational requirements. The Horus system identifies different causes for the wireless channel variations and addresses them to achieve its high accuracy. It uses location-clustering techniques to reduce the computational requirements of the algorithm. The lightweight Horus algorithm helps in supporting a larger number of users by running the algorithm at the clients. We discuss the different components of the Horus system and evaluate its performance on two testbeds. Our results show that the Horus system achieves its goal. It has an error of less than 0.6 meter on the average and its computational requirements are more than an order of magnitude better than other WLAN location determination systems. Moreover, the techniques developed in the context of the Horus system are general and can be applied to other WLAN location determination systems to enhance their accuracy. We also report lessons learned from experimenting with the Horus system and provide directions for future work. Moustafa Youssef is a research associate in the Department of Computer Science at the University of Maryland at College Park. He received his B.Sc. and M.Sc. in Computer Science from Alexandria University, Egypt in 1997 and 1999 respectively and the Ph.D. degree in computer science from University of Maryland in 2004. His research interests include location determination technologies, pervasive computing, energy-aware computing, sensor networks, and protocol modeling. Dr. Moustafa is a life fellow for the Egyptian Society for Talented, an elected member of the honor society Phi Kappa Phi, among others. He is a member of various professional societies such as IEEE, IEEE Computer Society, IEEE Communication Society and ACM Sigmobile. Dr. Moustafa is the recipient of the 2003 University of Maryland Invention of the Year award for his Horus work. Ashok K. Agrawala is a Professor of Computer Science at the University of Maryland. In 2001, he started the Maryland Information and Network Dynamics (MIND) Lab for which carries out research and development activities in partnership with the industry. He received his B.E. degree in 1963 and an M.E. degree in 1965 from the I.I.Sc., Bangalore; and a Master of Arts and his Ph.D. in Applied Mathematics from Harvard University in 1970. Prof. Agrawala is the author of seven books, six patents (awarded or pending), and over 240 papers and is a recognized authority in the research and use of time management in real-time processing and clock synchronization applications. He has developed a few location determination techniques and several other innovative technologies for systems and networks, which are in different stages of development. Prof. Agrawala is a fellow of the IEEE and senior member of the ACM.     

Mathematical Analysis of Throughput Bounds in Random Access with Z<Emphasis Type="SmallCaps">ig</Emphasis>Z<Emphasis Type="SmallCaps">ag</Emphasis> Decoding

We investigate the throughput improvement that ZigZag decoding (Gollakota and Katabi 2008) can achieve in multi-user random access systems. ZigZag is a recently proposed 802.11 receiver design that allows successful reception of packets despite collision. Thus, the maximum achievable throughput of a wireless LAN can be significantly improved by using ZigZag decoding. We analyze the throughput bounds in four different idealized multi-access system models for the case when ZigZag decoding is used. We also provide results for the Aloha and CSMA models where exact closed form solutions are infeasible to calculate. Our analysis and simulation results show that ZigZag decoding can significantly improve the maximum throughput of the random access system.     

A primal-dual gradient method for image decomposition based on (<Emphasis Type="Italic">BV</Emphasis>, <Emphasis Type="Italic">H</Emphasis><Superscript>−1</Superscript>)

The main aim of this paper is to accelerate the image decomposition model based on (BV, H ⁻¹). It is solved with a particularly effective primal-dual gradient descent algorithm. The algorithm works on the primal-dual formulation and exploits the information of the primal and dual variables simultaneously. It converges significantly faster than some popular existing methods in numerical experiments. This approach is to some extent related to projection type methods for solving variational inequalities.     

A Formal Analysis of Fault Diagnosis with <Emphasis Type="Italic">D</Emphasis>-matrices

As new approaches and algorithms are developed for system diagnosis, it is important to reflect on existing approaches to determine their strengths and weaknesses. Of concern is identifying potential reasons for false pulls during maintenance. Within the aerospace community, one approach to system diagnosis—based on the D-matrix derived from test dependency modeling—is used widely, yet little has been done to perform any theoretical assessment of the merits of the approach. Past assessments have been limited, largely, to empirical analysis and case studies. In this paper, we provide a theoretical assessment of the representation power of the D-matrix and suggest algorithms and model types for which the D-matrix is appropriate. We also prove a surprising result relative to the difficulty of generating optimal diagnostic strategies from D-matrices. Finally, we relate the processing of the D-matrix with several diagnostic approaches and suggest how to extend the power of the D-matrix to take advantage of the power of those approaches.     

On the analysis of parameter <Emphasis Type="Italic">γ</Emphasis> in fast TCP

The limits of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow model and window control model, the Laplace transform version of congestion control system are presented. It results in a negative feedback system with open loop transfer function. With the analysis of Nyquist curve of the system, a sufficient condition on asymptotical stability of FAST TCP congestion window related to the parameter γ is obtained. Packet level ns-2 simulations are used to verify the theoretical claims.     

Complex structure of optical transitions from the core <Emphasis Type="Italic">d</Emphasis>-levels of InAs and InSb crystals

Using an improved parameterless unified Argand diagram method, the permittivity spectra of InAs and InSb crystals in the range of 15–40 eV are decomposed into thirteen and twelve separate components, respectively, with the three main parameters, specifically, the maximum energies, half-width, and oscillator strength determined for each of them. The oscillator strengths are in the ranges of 0.006–0.10 for InAs and 0.014–0.076 for InSb. The permittivity spectra were preliminary calculated on the basis of experimental reflectance and absorption spectra using Kramers–Kronig integral relations. On the basis of a model of interband and exciton transitions, the nature of the obtained transition bands is suggested.     

PLL demodulation technique for <Emphasis Type="Italic">M</Emphasis>-ray Position Phase Shift Keying

The paper presents a kind of transmission system which employs M-ary Position Phase Shift Keying (MPPSK) to send data and Phase Locked Loop (PLL) based techniques for data retrieve. With a single PLL, MPPSK demodulation is achieved, as well as carrier recovery and symbol syn-chronization. Firstly, MPPSK modulation method is briefly introduced. 2PPSK’s PSD expression is given with its optimization result. Orthogonal Phase Detector (PD) and static threshold are used for the purpose of wider phase range and simplicity in demodulation. The data rate is alterable, which is 4.65 kbps for 2PPSK and 9.3 kbps for 4PPSK in the paper. Then some indicative comparisons in Signal to Noise Ratio Symbol Error Rate (SNR-SER) are made among 2PPSK, 3PPSK and 4PPSK, of which 4PPSK has proved to be optimal in ten slots each symbol conditions. And finally, it is demonstrated by system simulations that lower than 10–4 Symbol Error Rate (SER) performance can be obtained at 13 dB symbol SNR.