McAfee推进在华战略

全球入侵防护和安全风险管理解决方案领先供应商McAfee公司7月5日在华宣布,将正式启用中文名称“迈克菲”。同期还宣布在深圳成立的移动技术研究实验室已投入使用,为包括摩托罗拉在内的移动设备开发安全解决方案。此外迈克菲还与中国联通、百度、软通科技和华擎科技四家中国企业结盟,共同为中国的消费者提供安全产品。纵观McAfee的中国区战略,可以说是品牌加固、科研深化与结盟广泛全线推进。迈克菲寓意双重也许启用一个中文名称本身并不是一件值得大惊小怪的事,但从McAfee董事会主席兼CEO GeorgeSamenuk先生亲临北京别具匠心的新闻发…     

干涉型激光直写技术用于光盘防伪

利用作者研制的干涉型激光直写系统，阐述了干涉型激光直写设计OVD的方法，防伪特征，介绍了应用于光盘防伪的OVD技术和应用前景，给出了实验结果。     

Wavelength and Waveband Assignment for Ring Networks Based on Parallel Multi‐granularity Hierarchical OADMs

In this paper we study the optimization issues of ring networks employing novel parallel multi‐granularity hierarchical optical add‐drop multiplexers (OADMs). In particular, we attempt to minimize the number of control elements for the off‐line case. We present an integer linear programming formulation to obtain the lower bound in optimization, and propose an efficient heuristic algorithm called global bandwidth resource assignment that is suitable for the design of large‐scale OADM networks.     

基于USB总线的虚拟频谱分析仪设计

文章详细介绍了基于USB总线的虚拟频谱分析仪的设计过程。该仪器使用嵌入式混合处理器MC56F8323来实现动态信号的实时采集、频谱分析和数字滤波等功能。处理结果由USB2．0接口芯片CY7C68013上传至PC机．以完成数据显示、存储、绘制图形等功能。其中，CY7C68013工作于Slave FIFO模式，以实现与MC56F8323间的数据传输。该系统可同时对两路动态信号进行实时谱分析，每路采样频率高选500kHz。     

基于Matlab的雷达试验数据分析处理系统

针对雷达外场试验中的需求,提出了基于Matlab软件平台的数据分析处理系统。该系统能很好地完成雷达录取数据的精度分析、威力分析和各种显示图形的绘制,并且在实际中得到了应用。     

TD-SCDMA系统终端中的GMM功能实体研究

移动性管理(MM,MobilityManagement)是层3的一个子层,它主要完成与用户的移动性相关的一些功能。根据业务的分域划分,MM子层被分为支持CS模式的MM实体和支持PS模式的GMM实体。本文通过对GMM一般过程和特殊过程的描述,介绍了TD-SCDMA系统终端GMM实体的功能及其实现过程。     

A call admission and rate control scheme for multimedia support over IEEE 802.11 wireless LANs

Quality of service (QoS) support for multimedia services in the IEEE 802.11 wireless LAN is an important issue for such WLANs to become a viable wireless access to the Internet. In this paper, we endeavor to propose a practical scheme to achieve this goal without changing the channel access mechanism. To this end, a novel call admission and rate control (CARC) scheme is proposed. The key idea of this scheme is to regulate the arriving traffic of the WLAN such that the network can work at an optimal point. We first show that the channel busyness ratio is a good indicator of the network status in the sense that it is easy to obtain and can accurately and timely represent channel utilization. Then we propose two algorithms based on the channel busyness ratio. The call admission control algorithm is used to regulate the admission of real-time or streaming traffic and the rate control algorithm to control the transmission rate of best effort traffic. As a result, the real-time or streaming traffic is supported with statistical QoS guarantees and the best effort traffic can fully utilize the residual channel capacity left by the real-time and streaming traffic. In addition, the rate control algorithm itself provides a solution that could be used above the media access mechanism to approach the maximal theoretical channel utilization. A comprehensive simulation study in ns-2 has verified the performance of our proposed CARC scheme, showing that the original 802.11 DCF protocol can statically support strict QoS requirements, such as those required by voice over IP or streaming video, and at the same time, achieve a high channel utilization. Hongqiang Zhai received the B.E. and M.E. degrees in electrical engineering from Tsinghua University, Beijing, China, in July 1999 and January 2002 respectively. He worked as a research intern in Bell Labs Research China from June 2001 to December 2001, and in Microsoft Research Asia from January 2002 to July 2002. Currently he is pursuing the PhD degree in the Department of Electrical and Computer Engineering, University of Florida. He is a student member of IEEE. Xiang Chen received the B.E. and M.E. degrees in electrical engineering from Shanghai Jiao Tong University, Shanghai, China, in 1997 and 2000, respectively, and the Ph.D. degree in electrical and computer engineering from the University of Florida, Gainesville, in 2005. He is currently a Senior Research Engineer at Motorola Labs, Arlington Heights, IL. His research interests include resource management, medium access control, and quality of service (QoS) in wireless networks. He is a Member of Tau Beta Pi and a student member of IEEE. Yuguang Fang received a Ph.D degree in Systems and Control Engineering from Case Western Reserve University in January 1994, and a Ph.D degree in Electrical Engineering from Boston University in May 1997. From June 1997 to July 1998, he was a Visiting Assistant Professor in Department of Electrical Engineering at the University of Texas at Dallas. From July 1998 to May 2000, he was an Assistant Professor in the Department of Electrical and Computer Engineering at New Jersey Institute of Technology. In May 2000, he joined the Department of Electrical and Computer Engineering at University of Florida where he got the early promotion with tenure in August 2003 and has been an Associate Professor since then. He has published over one hundred (100) papers in refereed professional journals and conferences. He received the National Science Foundation Faculty Early Career Award in 2001 and the Office of Naval Research Young Investigator Award in 2002. He is currently serving as an Editor for many journals including IEEE Transactions on Communications, IEEE Transactions on Wireless Communications, IEEE Transactions on Mobile Computing, and ACM Wireless Networks. He is also actively participating in conference organization such as the Program Vice-Chair for IEEE INFOCOM’2005, Program Co-Chair for the Global Internet and Next Generation Networks Symposium in IEEE Globecom’2004 and the Program Vice Chair for 2000 IEEE Wireless Communications and Networking Conference (WCNC’2000).     

天融信逾越中国企业"坎"

从去年年底的一段时间以来,尽管天融信备受外界关注,但除了宣布去年9月在天融信成立十周年之际,具有丰富国际企业运作和管理经验的金玉丹先生出任天融信公司的CEO和今年一月任命韦文为公司CTO以外,天融信通过正面渠道向外界发出的声音似乎并不多,大家听到更多的是通过小道消息或传闻,有人说天融信正在进行人事变动,也有人说天融信正在历经变革与调整,但都未得到正面证实。然而近期天     

SafeNet实现超强安全加密

安全加密产品的领导者SafeNet 公司,近日发布了新一代世界级高安全加密锁产品——圣天狗,以确保软件开发商的知识产权不被非法盗用。圣天狗(Sentinel Dog)是第一个也是唯一一个在市场上采用公钥技术、AES加密和内部验证机制的保护锁。它在提供超强安全加密性能的同时具有弹性化的授权模式。