Moving toward maturity: research in technical communication

Research in technical communication in 1989 is assessed. The analysis indicates that systematic research in technical communication is still in a limited stage of development. One major problem is the lack of a clear distinction between an illustrative case and a case study in the empirical sense. In the few articles presenting systematic research, the most frequently used methodology is survey/questionnaire. Problems include sample selection and generalizability. In several studies, however, surveys were just one of several tools in a qualitative approach. While some projects were carefully designed, overall, the quality of the methodology is uneven. A comparison of the areas being researched with those designated by technical communicators as needing research revealed that more research is needed in management. Also needed is more systematic research into visual aspects of technical communication     

Linux平台下基于GTK+的聊天室设计

Linux作为一种自由和开放源码的类Unix操作系统,越来越受到广大编程者的青睐,而GNU图像处理程序(GIMP,GNU Image Manipulation Program)工具包(GTK+,GIMP Tool Kit)作为一套跨多种平台的图形工具包,在被GNU网络对象模型环境(GNOME,The GNU Network Object Model Enviroment)选中作为Linux下图形开发界面的主流开发工具之一后,由于其优越的性质也是广为流传。通过对GTK+编程技术的研究,运用套接字接口,再结合多线程技术,构建了一个简单的聊天室。验证表明,该聊天室可以实现服务器端和客户端的聊天功能。     

The Effect of System and Amplifier Parameters on the Performance of Average Soliton Transmission System Using PSA as In-Line Amplifier

In this paper,the effect of system and amplifier parameters on the performance of soliton transmission systemusing Phase Sensitive Amplifier(PSA)as in-line amplifier has been researched theoretically by computer simulation.Since in PSA soliton system the performance of average soliton regime is much better than that of dynamic soliton regime,in our simulation we only considered average soliton regime.Our simulation results show that although using PSA as in-line amplifiers in soliton system can not only overcome Gordon-Haus restriction but also suppress solitons interaction,lengthen soliton stable transmission distance significantly,the system and amplifier parameters have to be chosen carefullyin order to get a better system perorformance.     

Strain gauge based sensing hydraulic fixtures

Clamping errors in workpiece positioning decrease the outcome of machine tools. To avoid rejects, which occur due to failures in the clamping, a sensory clamping system is being investigated at the Institute of Production Engineering and Machine Tools (IFW). The aim is to provide hydraulic clamping elements with sensory capabilities to enable condition and process monitoring of the clamping system inside the harsh environment of a machine tool.Firstly, this paper gives a general survey of the targeted application and the concept to achieve a sensory clamping system for the industrial use in series production. Then it focuses on the integration of strain gauges into the exemplary chosen hydraulic swing clamp. Hereby, it shows the qualification of strain gauges for the estimation of different objectives, like hydraulic pressure, piston position, and external loads. Therefore, methods for the identification of suitable positions for the strain gauge integration into the clamping element are being discussed on the basis of experimental results and simulations. Furthermore, a method to achieve higher sensor sensitivity by 71% to the detriment of the compliance by 1.3% is presented.     

Fault injection spot-checks computer system dependability

Computer-based systems are expected to be more and more dependable. For that, they have to operate correctly even in the presence of faults, and this fault tolerance of theirs must be thoroughly tested by the injection of faults both real and artificial. Users should start to request reports from manufacturers on the outcomes of such experiments, and on the mechanisms built into systems to handle faults. To inject artificial physical faults, fault injection offers a reasonably mature option today, with Swift tools being preferred for most applications because of their flexibility and low cost. To inject software bugs, although some promising ideas are being researched, no established technique yet exists. In any case, establishing computer system dependability benchmarks would make tests much easier and enable comparison of results across different machines     

太阳能照明系统LED驱动器的优化研究与设计

太阳能照明已成为一项重要的研究课题,应运而生的LED照明光源的驱动技术也成为被研究的主要对象,文中对大功率LED的驱动方法进行了研究与分析,设计和制作了基于恒定导通时间控制的LED驱动器,并对高效驱动LED的恒流驱动电路进行了优化改进,使其与太阳能照明系统实现最优组合。     

CALCE/RAMCAD for Electronics

The University of Maryland's Computer Aided Life Cycle Engineering (CALCE) research effort is aimed at developing techniques for design, analysis, prediction, and optimization of electronics with respect to a variety of design goals. Performance, producibility, reliability, maintainability, life-cycle cost, safety, etc., are the design criteria which are being integrated through the application of interactive heuristic and algorithmic design optimization techniques. The University of Maryland Reliability and Maintainability Computer-Aided Design (RAMCAD) research is CALCE and is focused on second- and third-level electronic package design with respect to interfacing thermal, mechanical, and reliability analysis. The goal is to make reliability and maintainability an integral, real-time, and upfront part of the design process, such that the need to resubmit designs will be eliminated. The motivation behind this project was the fact that schedule constraints are often compromising the effectiveness and efficiency of the design process. To achieve the goal of CALCE/RAMCAD, a cohesive and extensible design environment for analysis and tradeoff tools was developed. A system executive controller that integrates tools for analysis while providing system transparency, design data management, and process management was developed to guide the user through the design process and provide direct access to the design tools. These developments required the integration of computer-aided design (CAD), artificial intelligence (AI), and decision support (DS) techniques. Attention to human factors and the use of interactive graphics were also instrumental in the development.     

基于本体的博物馆知识库构建方法研究

近年来,本体被计算机领域广泛用于知识表达、共享和重用,国内外很多大学及研究机构对本体展开了大量相关研究。为了整合博物馆领域相关信息资源,实现博物馆知识的共享和重用,利用本体技术构建博物馆知识库。通过对本体描述语言、本体构建工具和领域本体构建方法的研究,采用七步法构建了博物馆信息本体,并用本体语言OWL描述该本体,最后设计并实现了B/S架构的博物馆知识库系统。     

纯电动中型客车动力系统参数匹配及性能研究

针对现有车辆改装技术缺乏相应的参数匹配研究及动力学仿真分析,提出利用参数匹配和动力学分析研究汽车改制的方法,该方法以“LS6600C1”型普通中型客车改装的纯电动试验车为研究对象,对动力系统进行参数匹配设计,并利用电动汽车仿真软件ADVISOR建立相应的纯电动汽车动力系统及整车仿真模型,对整车模型的最高车速、加速能力、爬坡性能和续驶里程等指标进行了仿真研究。结果表明,典型工况下改装后的纯电动试验车续驶里程、最高车速、加速性能和爬坡性能等均满足普通中型客车的运行要求和使用条件,该改装技术具有广泛的应用前景。     

数字化工厂技术在电子制造领域的应用

数字化工厂作为制造业新兴技术,近年来在欧美国家及国内得到了广泛的研究,并应用于各类工业生产企业.详细介绍了数字化工厂技术在军工电子制造领域的最新研究成果和成功应用,包括数字化工厂应用架构、生产制造执行系统的主要功能和运行组织方式,同时阐述了以自动化仓储物流、自动化生产线为代表的自动化技术及以此为基础的生产制造信息化管理技术.这些技术促进了企业制造水平的提高,也为先进制造技术的进一步研究和应用打下了良好的基础.     

基于嵌入式Web服务器的监控系统的Java解决方案

监控系统已广泛应用于各种领域,其设计方法也成为研究重点.Java语言是该系统设计的主要方法.本文以天线监控系统的设计为例,研究了以Java作为监控系统的设计语言的设计方法及其优点.     

变间隙法布里-珀罗干涉式长波红外光谱成像系统

干涉式长波红外光谱成像技术以其独特的工作原理和谱段特性,在众多领域具有广泛的应用前景。为解决仪器小型化、轻量化问题,研究了一种基于变间隙法布里-珀罗（F-P）干涉仪的新型长波红外光谱成像系统。在分析系统工作原理的基础上,研究了确定F-P干涉腔两反射面的反射率、变间隙干涉腔的楔角等主要参数的理论依据;搭建了实验系统,得到了整个装置对黑体宽波段热辐射的响应;通过将系统测得的聚丙烯薄膜的透过率曲线与高精度光谱辐射计测量结果进行比较,结果显示系统光谱分辨率满足理论设计要求。研究表明:该系统能够有效满足长波红外光谱成像系统的轻便化、小型化的需求。     

“电磁场与电磁波”课程的Matlab辅助教学

为了提高教学的可视化,我们在＂电磁场与电磁波＂课程教学中引入Matlab软件工具。本文针对课程中的难点和重点,利用Matlab工具箱及各类函数,对于具体的实例给出了仿真结果。Matlab软件工具在教学中的应用,改进了教学方法和手段,丰富了教学内容,取得了良好的教学效果,为课程教学改革探索了新的思路。     

PSM: an object-oriented synthesis approach to multiprocessor systemdesign

Although multiprocessor systems are becoming a trend today, few synthesis tools currently available can actually automate the design of multiprocessor systems. Performance synthesis methodology (PSM) is an object-oriented system-level synthesis approach to multiprocessor system design. Since PSM was designed specifically for the synthesis of multiprocessor systems, it is not only much more efficient when synthesizing parallel systems, but also produces better parallel systems than currently available uniprocessor system-level synthesis tools. Colored Petri nets used in modeling system components and object modeling technique used in the design process have both contributed to the shortening of system development time and to the reduction of design cost. First, user specification consisting of functional models and performance constraints is translated into architecture models. Then, the system is configured by selecting the method of control, the memory organization, the type of processor, and the type of system interconnection. Finally, a heuristic design space exploration algorithm is used to generate several near-optimal design alternatives. The best architecture is chosen by evaluating the design alternatives using a flexible performance estimation formula that mainly considers system level design features, such as system throughput, utilization, reliability, scalability, fault-tolerance, and cost. Several systems were successfully synthesized using this top-down object-oriented PSM, thus showing its feasibility as a design automation tool for parallel systems     

Modern development methods and tools for embedded reconfigurable systems: A survey

Heterogeneous reconfigurable systems provide drastically higher performance and lower power consumption than traditional CPU-centric systems. Moreover, they do it at much lower costs and shorter times to market than non-reconfigurable hardware solutions. They also provide the flexibility that is often required for the engineering of modern robust and adaptive systems. Due to their heterogeneity, flexibility and potential for highly optimized application-specific instantiation, reconfigurable systems are adequate for a very broad class of applications across different industry sectors. What prevents the reconfigurable system paradigm from a broad proliferation is the lack of adequate development methodologies and electronics design tools for this kind of systems. The ideal would be a seamless compilation of a high-level computation process specification into an optimized mixture of machine code executed on traditional CPU-centric processors and on the application-specific decentralized parallel data-flow-dominated reconfigurable processors and hardware accelerators. Although much research and development in this direction was recently performed, the adequate methodologies and tools necessary to implement this compilation process as an effective and efficient hardware/software co-synthesis flow are unfortunately not yet in place. This paper focuses on the recent developments and development trends in the design methods and synthesis tools for reconfigurable systems. Reconfigurable system synthesis performs two basic tasks: system structure construction and application process mapping on the structure. It is thus more complex than standard (multi-)processor-based system synthesis for software-programmable systems that only involves application mapping. The system structure construction may involve the macro-architecture synthesis, the micro-architecture synthesis, and the actual hardware synthesis. Also, the application process mapping can be more complicated and dynamic in reconfigurable systems. This paper reviews the recent methods and tools for the macro- and micro-architecture synthesis, and for the application mapping of reconfigurable systems. It puts much attention to the relevant and currently hot topic of (re-)configurable application-specific instruction set processors (ASIP) synthesis, and specifically, ASIP instruction set extension. It also discusses the methods and tools for reconfigurable systems involving CPU-centric processors collaborating with reconfigurable hardware sub-systems, for which the main problem is to decide which computation processes should be implemented in software and which in hardware, but the hardware/software partitioning has to account for the hardware sharing by different computation processes and for the reconfiguration processes. The reconfigurable system area is a very promising, but quite a new field, with many open research and development topics. The paper reviews some of the future trends in the reconfigurable system development methods and tools. Finally, the discussion of the paper is summarized and concluded.     

DC-DC转换器中功率沟槽MOSFET的优化设计

利用工艺和器件模拟软件TSUPREM-4和MEDICI,研究了工艺参数对DC-DC转换器中的功率沟槽MOSFET的通态电阻Ron、栅-漏电容Cgd的影响以及栅-漏电荷Qgd在开关过程中的变化,指出了在设计和工艺上减小通态电阻Ron和栅-漏电容Cgd,提高器件综合性能的途径。     

Study on chaos phase space synchronous rotation and distinguish switching security communication

A new chaotic dynamic system was proposed and the dynamic of this system was analyzed.Through the research of balance point,Lyapunov index,Lyapunov dimension and Poincare section,the chaotic behavior of the system was approved.Z axis of chaos system phase space was researched.Z axis rotation model in the phase space was built through introducing rotation matrix,and chaos system space synchronous rotation was researched.Based on the research results above,a chaotic distinguish switching security communication system was presented for the communication of information security.     

戈壁地区天空背景光谱研究

利用天空背景测量设备测量了西北戈壁地区的天空背景光谱亮度,对该地区典型时刻的背景光谱分布进行了研究;针对相应背景光谱下的滤波技术对光电系统探测能力的提高进行了仿真研究.研究结果表明：该地区的背景光谱分布相对于理论分布来说,600～900 nm光谱波段背景亮度所占的比重较大,且随着方位角、天顶角的改变光谱分布变化不大;在天空背景为10 W.m-2Sr-1条件下,在该地区采用600～900 nm滤波方式光电系统的探测能力只得到约0.1等星提高.     

Development of a virtual metrology for high-mix TFT-LCD manufacturing processes

Nowadays,TFT-LCD manufacturing has become a very complex process,in which many different products being manufactured with many different tools.The ability to predict the quality of product in such a high-mix system is critical to developing and maintaining a high yield.In this paper,a statistical method is proposed for building a virtual metrology model from a number of products using a high-mix manufacturing process.Stepwise regression is used to select key variables that really affect the quality of th...