USB数据传输中CRC校验码的并行算法实现

文章介绍了用于USB总线数据传输的CRC校验的原理和算法，并且采用并行电路实现USB2．0中的CRC产生和CRC校验，与传统的串行电路实现相比，并行电路实现方法虽然在芯片面积上大于串行电路实现，但由于降低了时钟频率，电路更容易综合实现，并且大大降低了功耗，有利于低功耗电路设计。     

短消息前转业务的技术实现分析

文章全面分析了目前所有短消息前转业务的技术实现方案，总结了每种实现方式的设备和接口要求，提出了计费方式的建议，最后对各种实现方式进行了对比分析，为实现该业务提供技术选择的参考。     

用FPGA实现Viterbi译码器

结合Viterbi译码算法和最新的FPGA实现技术，对实现Viterbi译码器的两种常见实现思路进行分析，仿真并采用FPGA对其中的一种进行了终端验证。对两种算法采用Verilog Hdl实现，其中寄存器交换算法实现起来相对简单，对其进行了终端验证；基于存储器管理的算法实现起来相对困难，回溯模块和存储器寻址是实现的难点与焦点，本论文提出了两种存储器的寻址方法，并对其进行了仿真。整个设计采用Verilog HDL实现。     

基于以太网实现VOD的方法研究

对基于以太网视频点播（VOD）系统的实现方法进行了研究，综述了VOD的特点、结构及其关键技术，介绍了基于以太网的VOD系统结构，系统实现的主要工作，重点讨论了系统实现的几项关键技术，指出了该系统实现方法的应用范围。     

基于TD-SCDMA系统的完整性保护算法的研究

无线传输的保密性和安全性已经成为用户的需求，完整性保护正是基于传输安全而设计提出的，他是第三代移动通信要求实现的基本功能。现介绍了完整性保护在无线通信系统中的应用以及实现的方法，并且基于TD—SCDMA系统以其一般性过程为例，还详细介绍了完整性保护实现的具体过程，最后结合实际工作中的成果，重点分析了其算法的实现，其中包括算法实现的设计思想，参数设计，以及算法最终实现的流程图。     

GSM短消息系统在远程数据采集中的应用

本介绍了GSM短消息系统在远程数据采集中的一个实现方案。详细阐述了系统实现的原理，介绍了系统中使用的关键技术，给出了系统实现的硬件框图和软件流程，最后给出了软件实现I^2C总线的方法。     

基于WAP的MUA实现

基于WAP的MUA的实现分析，设计了实际可行的系统方案，建立了具体的实现模型，并简单描述了实现的流程，对其相应的算法进行了分析。     

一种FM信号调制解调数字化实现方法研究

针对陆军某通信电台应用需求，本文提出了一种基于软件无线电设计思想的 FM 信号调制解调数字化实现方法，给出了数字化实现 FM 信号调制解调的原理架构及实现步骤，并与传统的模拟实现方式进行对比，最后对数字化实现过程进行了仿真验证。该方法已实际应用于项目，性能达到了军标要求。     

VPN及其隧道技术研究

文中阐述了VPN及其实现的主要技术——隧道。首先探讨了VPN的产生背景及其能够实现的功能，VPN利用不可靠的公用互联网络作为信息传输媒介，通过附加的安全隧道，用户认证，访问控制等技术实现与专用网络类似的安全性能：随后分析了实现VPN的隧道技术和隧道协议，并着重分析了第二层隧道协议和IPSec第三层隧道协议的实现原理；然后对各种协议作了深入的比较，包括实现难度和性能等；最后对VPN的未来进行了预测，并说明了技术实现的趋势。     

IPSEC技术的研究及实现

介绍了IPSec技术的结构框架并详细讨论各个组成部分(包括认证协议头，安全加载封装安全保护机制，互联网密钥交换协议，解释域，策略等)，讨论了IPSec的实现方式，重点指出了隧道实现方式，并提出了IPSec隧道模式的一个实现框架。     

网格特征的进一步讨论

网格的本质特征主要是低成查高效能、安全性更可靠、异构整合调度；一般物理特征具有充分共享性、虚拟抽象性、有机集成性和合理协商性等。网格还具有分布复杂，规模巨大；资源汇集，充分共享；动态增减，异构多样；同构类似，管理多重等普通特征。网格的多方参与性特征体现在源于各方，差异性强；数据海量、．功能不同；多方建设、协同维护；用户众多、需求各异。分析、研究这些特征对网格技术研究、应用以及网格建设有重要意义。     

TDD移动通信系统技术浅析与展望

TDD模式移动通信系统相对于FDD系统有着独特的优势,如支持不对称业务,高频谱利用率,设备复杂度低。在介绍TDD移动通信系统特点的基础上,针对当前出现的新技术,如MIMO、智能天线、Ad-hoc、自适应调制技术TD-LAS-CDMA等,结合TDD移动通信系统的特点,分析了各技术在实际系统应用中的优缺点,最后展望在该模式下移动通信系统的发展前景。     

一种基于WinForm的GPU配置管理系统设计与实现

GPU功能配置模块众多,设置过程步骤繁琐,且配置项之间关系紧密,增加了GPU应用开发难度.针对该问题,文中设计一种基于WinForm的GPU配置管理系统.该系统分为软件数据生成和硬件环境配置两部分,具有完成开机/告警画面生成、驱动配置、汇编工具、光标生成、接口配置和字库工具等功能.运行时可根据用户提供的配置信息,算法自...     

A dynamic model for the assessment of the replacement of lead in solders

A dynamic, interactive map has been developed of the life cycle of a number of metals, from mining through to minerals processing, metal production, product manufacturing, recovery, and waste management. While the existing metal process network and waste management infrastructure provide substantial scope for (product) design, these also limit change because of the strong path dependency of industry and infrastructure development. Therefore, models for dynamic simulation were constructed that allow the specification and evaluation of the metal process network and waste management infrastructure “products” over a longer time span. The model has been constructed using a bottom-up approach, to enable assessment of the environmental aspects of metallurgy, and to simulate changes in the system structure and technology, i.e., from the reactor or individual process step up to integrated material cycles. This dynamic interconnected model is used to investigate the impact of the removal of lead from solders on the coupled flows of the metals Ag, Au, Bi, Cu, Fe, Ni, Pb, Sn, Zn, and PGMs.     

Advances in Printing and Electronics: From Engagement to Commitment

In recent years, printed electronics reached enormous popularity as a result of their huge potential to offer unique features that are not attainable through traditional fabrication, namely low-cost production, multifunctionality, stretchability, sustainability, and flexibility. Being expected a galloping increase in the use of printed technologies in the near future, due to the digitalization efforts associated with the Internet of Things and the 4.0 revolution, it is timely and desirable to discuss the joint features, the interrelations, the complementarities, the interdependency, and the most demanding challenges linked to the relation between printed technologies and electronic materials. In this context, this study offers a broad review of the numerous printing technologies used in the processing of electronics, commonly used substrates, the most effective printed electronic materials, and the key post-printing treatments such as sintering. Disruptive challenges in various printing techniques, (un)expected future research directions of printed electronics, and imminent application trends are also highlighted, following a critical and subjective perspective.     

Metadata Design for Reconfigurable Protocol Stacks in Systems Beyond 3G

Global consensus on the next generation of wireless mobile communications, broadly termed “beyond 3G”, sketches a heterogeneous infrastructure comprising different wireless systems in a complementary manner and vested with reconfiguration capabilities, which support a flexible and dynamic adaptation of the wireless network and its spectrum resources to meet the ever-changing service requirements. For ubiquitous reconfiguration to become a practical capability of mobile communication systems, it is necessary to establish a global architecture for modeling, expressing, and circulating essential metadata related to reconfiguration, including reconfigurable device capabilities and semantic properties of protocol stacks. We outline the relevant standardization initiatives in the mobile domain, summarize existing work in reconfiguration-supporting architectures, and identify key shortcomings that may hinder the advent of ubiquitously reconfigurable systems. Further on, we point out some major limitations of current metadata standards in the mobile domain for the representation of capability information pertaining to reconfigurable protocol stacks. Next, we identify essential metadata classes in support of reconfigurable communication systems, introducing an associated object-oriented UML model. We elaborate on the design rationale of the UML model, presenting and discussing the alternative metadata representation standards and suitable encoding formats. Finally, we demonstrate the suitability of our UML model by applying our reconfiguration-supporting vocabulary in the cases of a standardized protocol stack of 3G mobile devices and stationary 3G cellular network elements. Vangelis Gazis received his B.Sc. and M.Sc. (Communication Networking) degrees from the Department of Informatics & Telecommunications of the University of Athens, Greece, in 1995, and 1998, respectively. He also received an M.B.A. degree from the Athens University of Economics and Business in 2001. Since 1996 until, he has been with the research staff of the Communication Networks Laboratory (CNL) of the University of Athens. He has participated in national and European research projects (MOBIVAS, ANWIRE) of the IST framework programme. He specializes in reconfigurable mobile systems and networks for beyond 3G, metadata and ontology languages, reflective and component middleware, adaptable services and open API frameworks for telecommunications. He is currently a Ph.D. candidate in the Department of Informatics & Telecommunications of the University of Athens. Nancy Alonistioti holds a B.Sc. degree and a Ph.D. degree in informatics and telecommunications from the University of Athens. Presently, she is a senior researcher in the Department of Informatics and Telecommunications of the University of Athens. In the past, she has held a research position with the Institute of Informatics and Telecommunications of NCSR “Demokritos” in the areas of protocol and service design and testing, mobile systems (UMTS), open architectures, and software defined radio systems and networks. Her current research interests are in reconfigurable mobile systems and networks beyond 3G, and adaptable services, pervasive computing and context awareness. She has participated in several national and European R&D projects, and has been the technical manager of the IST-MOBIVAS and IST-ANWIRE projects, which have had a focus on reconfigurable mobile systems, networks an respective service provision. She is currently a member of the management team and workpackage leader in the FP6 IST-E2R project on reconfigurability; she also serves as technical manager for the University of Athens in the FP6 IST-LIAISON project, which focuses on location based services in working environments. Dr Alonistioti is co-editor and co-author of the book entitled “Software defined radio, Architectures, Systems and Functions”, published by John Wiley in May 2003. She has authored over 55 publications in the area of mobile communications and reconfigurable systems and networks. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of the Electrical Engineering and Computer Science Department, University of Connecticut, Storrs. From 1986 to 1994, he was on the faculty of the Electrical and Computer Engineering Department, Northeastern University, Boston, MA. During the period 1993D1994, he served as Director of the Communications and Digital Processing Research Center, Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies and Services (ACTS) and Information Society Technologies (IST) programs funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE, E2R, LIAISON). His research interests are in the design and performance analysis of communication networks, and wireless/mobile communication systems and services. He has authored more than 190 papers in the above areas. Dr. Merakos is Chairman of the Board of the Greek Universities Network, the Greek Schools Network, and Member of the Board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

智能语音操控在广电端到端的系统设计及应用

在数字化中国的大背景下,在公司个人宽带与互动电视在线交费用户均突破300万户的情况下,为解决我们的用户总找不到自己喜欢看的节目,记不住频道名称和喜欢的节目,提升公司竞争力。通过对前端的点播系统、AAA系统、EPG系统、PORTAL系统、ISMP系统、媒资系统、机顶盒终端的功能进行剥离、整合和详细设计,最后完成终端用户语音操控电视直播、点播、时移、回看、页面操控、系统设置,并支持普通话和四川话方言的目的。达到提升用户体验,增加公司竞争力,促进业务的发展。系统试运行后,用户体验效果得到很大提升,完全达到预期设计目的。     

对比有线与无线——映照通信技术的过去与未来

文中通过有线通信和无线通信的发展历程,对比两种传输技术的特点,着重体现两者在各自技术演进中的相互关系.接着通过图表说明目前语音业务中移动取代固网的局面,从而反映两者激烈的竞争状况.最后通过分析原因,指明通信技术发展的必然趋势就是有线无线的融合,并且融合的方向主要是业务、终端、网络的融合.     

通用数据访问接口中间件的设计与应用

目前,不同的数据库系统在高级语言的开发接口上存在较大差异,需要针对数据库系统编写相应的代码。当数据库改变时,应用代码也要相应的修改,系统灵活性会变差。针对上述问题,采用分层思想,在应用层和数据库访问层间增加中间层,即数据库访问接口中间件。通过对应用层和数据库访问层的抽象,实现应用接口与数据库访问控制分离,可至少减少20%的程序开发代码量,提高了系统的扩展性和可维护性。     

黑瓷封装烧结工艺调节

文章介绍了低温玻璃熔封的基本原理,分析了黑瓷封装器件在封装过程中缺陷产生的原因。以日本801型链式烧结炉为例,通过烧结工艺及过程,论述了预烘、烧结气氛、封盖温度、保温时间、升降温速率以及其他因素对黑瓷封装熔封工艺的影响,根据这些影响黑瓷封装熔封工艺的因素进行细化工艺。最后,总结出器件缺陷产生的几种常见形式,并针对性地提出了具体调节黑瓷封装熔封工艺的一些技,亍和方法,以及这些技巧和方法的适用范围,以便掌握黑瓷封盖的基本规律,在以后生产中提高产品可靠性和合格率。