MPLS技术在唐山有线电视综合信息网数据平台中的设计与应用

MPLS技术是一项具有多协议支持的技术，它综合利用了网络核心的交换技术和网络边缘的IP路由技术各自的优点，它将标记分配给多协议的数据桢以便在基于我展品信元的网络中传输。它能够提供现有传统IP路由技术所不能支持的要求保障QoS的业务，通过MPLS技术，我们可以提供各种新兴的增值业务，有效的实施流量工程和计费管理措施，扩展和完善更高等级的基础服务。     

Low response time context awareness through extensible parameter adaptation with ORCA

Ubiquitous computing applications or widespread robots interactions execute in unforeseen environments and need to adapt to changeful available services, user needs, and variations of the environment. Context-awareness ability addresses such a need, enabling, through adaptation rules, applications to react to the perceived dynamic variations. Responses to adaptation have to be quick enough to maximize the time during which the application is coherent with its environment. Adaptation rules, associating variations of the environment to application reactions, are usually established at design time. However, in unforeseen and partially anticipated environments, we claim that adaptation rules have to be dynamically extensible to match previously unexpected variations. Our approach enables rule composition and ensures a deterministic result. We propose to use parameter adaptation to quickly respond to environmental variations and dynamic compositional adaptation to provide extensibility to the parameter adaptation. To foster even lower response times, we internalize context-awareness processing and decision into the application.     

一个新的门限多重代理多重签名方案

In the Paper, we proposed a threshold mult- proxy multi-signature with share verification.In the scheme,a subset of original signers allows a designated group to proxy signers to sign on behalf of the original group, A message m has to be signed of proxy signers who can represent the proxy group. Then, the proxy signature is sent to the verifier group.A subset of verifiers in the verifier group can also represent the group to authenticate the proxy signature.In othe words,some threshold values will be given to indicate the number of persons to represent a group to authorize the signing capability or to sign a messagye or to verify the proxy signature.     

Preparing technical communication students to play a role on the translation team

Technical communicators need to be prepared for the challenges of international communication. This tutorial focuses on the need for technical communication faculty to prepare students to be skilled intercultural communicators and to play a role on the translation team. The tutorial begins with a discussion of the importance of writing for translation in the international workplace and then presents specific assignments designed to instruct students in intercultural communication and give them experience writing for translation. In addition to introducing students to the cultural issues that impact the creation of documentation for international audiences, these assignments also serve to reinforce core skills recognized as vital to professional success in the field of technical communication. Taken together, these assignments can be used as the basis for a course in international technical communication. An appendix to the tutorial includes numerous resources available to faculty who want either to develop a course in international technical communication or to include some of the assignments in existing technical communication courses.     

中间件技术在遗留系统改造中的应用

遗留系统是企业建立新信息系统时,面临的首要问题。在简单介绍了中间件技术的基础上,提出利用中间件技术通过构件化实现对遗留系统改造的方法,改造过程包括4个阶段:恢复遗留系统的软件体系结构;设计目标系统的软件体系结构;重新构造目标系统的构件;实现基于构件的目标系统。实践证明,该方法对遗留系统的再工程具有较大的实用价值。     

E-field ferroelectric sensors: Modeling and simulation [Instrumentation Notes]

In this article, a novel approach to sensing static electric fields has been presented. The approach is extremely interesting due to the low cost of the technology and the simplicity of the architecture. The purpose of the article is to highlight the strategic role of behavioral models in the development and design of E-field sensors. It is important to observe that simulation results must always be supported by experimental evidence to confirm the predicted behaviors. A good solution to perform a reliable investigation, if allowed, is to model the main blocks of the system separately and at the same time to experimentally assess their real behavior to confirm theoretical expectations.     

集成类IT项目的特点与管理方法

以PMBOK项目管理思想为基础,结合集成类IT项目的具体实践,经过多个项目摸索,寻找CMMI模型与集成类IT项目管理过程之间的映射关系.在此基础上进行归纳、总结、提炼,提出了一个初步的、基于CMMI模型的集成类IT项目管理体系架构.     

Reputation based selfishness prevention techniques for mobile ad-hoc networks

Mobile ad-hoc networks require nodes to cooperate in the relaying of data from source to destination. However, due to their limited resources, selfish nodes may be unwilling to forward packets, which can deteriorate the multi-hop connectivity. Different reputation-based protocols have been proposed to cope with selfishness in mobile ad-hoc networks. These protocols utilize the watchdog detection mechanism to observe the correct relaying of packets, and to compile information about potential selfish nodes. This information is used to prevent the participation of selfish nodes in the establishment of multi-hop routes. Despite its wide use, watchdog tends to overestimate the selfish behavior of nodes due to the effects of radio transmission errors or packet collisions that can be mistaken for intentional packet drops. As a result, the availability of valid multi-hop routes is reduced, and the overall performance deteriorates. This paper proposes and evaluates three detection techniques that improve the ability of selfishness prevention protocols to detect selfish nodes and to increase the number of valid routes.     

一种自循迹小车循迹方案优化系统

自循迹小车沿不同特征的曲线轨道运行,运行轨迹直接决定了小车能否快捷到达目的地.本文以高清摄像头捕获小车运行坐标,再利用LabVIEW根据坐标数组绘制运行轨迹,根据背景差分法对比轨道图和实际小车运行轨迹图,实现快速获得当前曲线特征的轨道对应的PID控制参数.     

Using Nonadditive Fuzzy Integral to Assess Performances of Organizational Transformation Via Communities of Practice

Organizational transformations have been widely adopted by firms who wish to improve their competitive advantage to be better prepared to face external challenges. This research has chosen Communities of Practice (CoPs) as the subject of discussion for an assessment model to reform organizations that undertake CoPs for collective knowledge to enhance their core competencies. Given the interrelationships between criteria, this research uses the nonadditive fuzzy integral to develop a framework for the CoPs performance assessment. The purposes of this paper are to identify the key dimensions/criteria in the CoPs, to use fuzzy logic method to analyze the relative importance of each criterion, and to rank the criteria so that proper resources can be allocated while managing the CoPs. Through interviews with experts, four strategy alternatives and 16 criteria along four dimensions are generated. A survey of the CoPs practitioners is then conducted to compare the results of each criterion. The results will not only help organizations that intend to initiate changes via the CoPs activities to decide the ranking of their appraisal criteria, but it can also assist them in guiding the behavior of their staff while effectively monitoring and improving the performances of the CoPs     

光性能检测系统中纳秒脉冲峰值检测方法(英)

In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to digital converter is proposed to broaden the nanosecond pulse and make it easier for the analog to digital converter to catch the peak of the nanosecond pulse.The experimental results demonstrate that,with the proposed scheme,the optical performance system needs less time to get the recovered eye-diagram of high speed optical data signal,and is robust to phase mismatch in the analog to digital converter circuit.     

再论坚持中国特色社会主义文化自信

坚持中国特色社会主义文化自信, 就是坚持对中国特色社会主义文化的认可、尊重、敬仰与传承、发扬、创新。坚持中国特色社会主义文化自信, 必须坚持习近平新时代中国特色社会主义思想在意识形态领域的指导地位, 全面把握和深刻理解中国特色社会主义文化的构成及其组成部分之间的内在逻辑关系, 坚持把中华优秀传统文化、革命文化和社会主义先进文化有机结合起来, 因应中国特色社会主义建设实践而不断进行创新, 增进文化认同。     

基于分区的代码覆盖率工具的研究与设计

随着嵌入式软件的规模和复杂性不断提高,白盒测试中经常用到覆盖率测试。轻量级覆盖率测试工具GCOV在使用上具有操作繁琐的弊端。本文基于GCOV覆盖率测试的原理,依据shell脚本批处理的特点将各部分操作封装为脚本工具,实现各脚本工具调用。通过该设计进行覆盖率报告输出节省了大量时间,提高了软件开发测试的效率。     

Optimization of gas utilization in plasma processes

The reduction of chemical usage in semiconductor manufacturing has been a topic of wide discussion over the past several years. The aim of this study is to optimize plasma efficiency as chemical reactions by using the Taguchi method. In short, the function of plasma is to serve as an etchant that reacts with films. The results of the reaction are discharged. The main point of optimization was to use a main etchant to increase the amount of desirable main reaction and to decrease the amount of unreacted gas in order to keep the undesirable side reaction to a minimum. We found chemical vapor deposition cleaning conditions that improve plasma efficiency up to 200%, perfluorocompounds (PFC) gas usage to one-third, and PFC gas emission to 25%. We also found nitride etching conditions that improve plasma efficiency up to 350%, SF/sub 6/ usage to 25%, SF/sub 6/ emission to 22%, and selectivity to oxide up to 145% over the previous conditions.     

Distributed code assignments for CDMA packet radio networks

Code-division multi-access (CDMA) techniques allow many users to transmit simultaneously in the same band without substantial interference by using approximately orthogonal (low cross-correlation) spread-spectrum waveforms. Two-phase algorithms have been devised to assign and reassign spread-spectrum codes to transmitters, to receivers and to pairs of stations in a large dynamic packet radio network in polynomial times. The purpose of the code assignments is to spatially reuse spreading codes to reduce the possibility of packet collisions and to react dynamically to topological changes. These two-phase algorithms minimize the time complexity in the first phase and minimize the number of control packets needed to be exchanged in the second phase. Therefore, they can start the network operation in a short time, then switch to the second phase with the goal of adapting to topological changes. A pairwise code-assignment scheme is proposed to assign codes to edges. Simulations based on well-controlled topologies (sparse topologies) show that the scheme requires much fewer codes than transmitter-based code assignment, while maintaining similar throughput performance     

Measurement and control of torque ripple-induced frame torsional vibration in a surface mount permanent magnet machine

A sensor to measure the stator torsional vibration due to torque ripple produced by a surface mount permanent magnet machine is first described. The sensor is relatively inexpensive and is straight forward to incorporate into a drive system. Experiments are performed to validate that the voltage produced by the sensor is linearly related to torque ripple amplitude. Closed-loop controllers are then described that adjust the stator current harmonics applied to the machine to achieve a commanded average torque while mitigating measured torsional vibration. Simulation and experimental results are used to demonstrate the effectiveness of the control techniques.     

期货套期保值VaR风险的最优期货量算法设计

期货套期保值是利用期货规避现货交易风险的一种有效策略,投资者在具体操作过程中,需要通过数学模型求出最优期货量进行套期保值方案的设计.VaR套期保值模型是用风险价值来度量套期保值风险,并且使VaR风险达到最小确定最优期货量的数学模型.基于期货套期保值VaR风险的最优期货量的算法设计与实现,对相对庞大的期货数据价格进行数值分析,为确保模型算法的精确性,选用了数值分析领域广泛应用的Matlab作为实现语言.     

A system for the exposure of small laboratory animals to a 25-mT60-Hz alternating or traveling magnetic field

A versatile exposure system which can be used to investigate the effects of a 60-Hz alternating magnetic field or traveling magnetic field on small laboratory animals is described. Special attention was given to the design of the electric circuit to simplify the supply requirements and to keep the overall current to a minimum. A magnetic field having a flux density up to 30 mT (300 G) can be generated, and a traveling magnetic field is obtained by reconnecting the coils to a three-phase supply. The total magnetic field due to the currents in the three coils used in the exposure system is analyzed. A computer program was written to evaluate the magnetic field in the region where the animals are located. The difference observed between measured and computed values is attributed to the representation of the multiturn, multilayer coils by equivalent single-turn coils     

Bispectrum estimation: A digital signal processing framework

It is the purpose of this tutorial paper to place bispectrum estimation in a digital signal processing framework in order to aid engineers in grasping the utility of the available bispectrum estimation techniques, to discuss application problems that can directly benefit from the use of the bispectrum, and to motivate research in this area. Three general reasons are behind the use of bispectrum in signal processing and are addressed in the paper: to extract information due to deviations from normality, to estimate the phase of parametric signals, and to detect and characterize the properties of nonlinear mechanisms that generate time series.     

VOD 点播业务在广电单向网络中的应用

在三网融合的情况下,双向化改造是广电网络发展的重点,但是双向网改需要大量的资金投入,大力开展双向业务还需要更换现有的机顶盒,资金压力在短时间内难以得到缓解,像以前一样单纯依赖收视费已经难以为继,亟需依靠多元化的增值业务以增强盈利能力,为此主要介绍在单向网络环境下开展的VOD增值业务系统。