一种文本聚类方法及BBS浏览机制研究

文章旨在探索一种新的BBS浏览方式，提出了一种新的文本聚类方法．即以分等级的菜单方式组织帖子，以引导用户方便地浏览他所感兴趣的帖子，也便于了解当前BBS上的热点话题。     

“密码学与网络安全”课程研讨式教学

我院的专业选修课程“密码学与网络安全”的授课对象是信息与通信工程专业高年级本科生.采用研讨式的教学不仅适应该课程的教学特点,同时还可培养学生文献查阅、理论仿真和系统综合设计等技能.本文阐述了该课程的课程目标、课程任务和教学原则.笔者针对研讨专题设置、研讨实施方式、研讨评价考核和研讨教学效果等问题,探讨了研讨式教学在该课程中的尝试和体会.     

Mobile social networking: reconnect virtual community with physical space

Online social networks (OSNs) such as Facebook and MySpace, etc., greatly improve our social connectivity and collaboration. However, those applications lead to a shift from physical communities to virtual communities. The recent availability of mobile broadband connections and location technologies, their increasing affordability, and the usability of new mobile devices (e.g. smartphones) have led to the emergence of mobile social networks (MSNs), which re-connect the virtual community to the physical region, and move users between them in a way that enhances both. Currently, MSN applications are mushrooming and racing to replicate the success of social computing in the mobile domain. We argue that the potential success of MSNs lies in active collaboration among users, which naturally arises many interdisciplinary challenges. However, there exists no systematical survey about MSNs. This paper thoroughly characterizes the basic design principles, research architecture, typical techniques, and fundamental issues in MSNs from cross-discipline and application viewpoints. Our contributions lie in the following aspects: First, we summarized the basic design principles and fundamental issues that run through MSN researches and applications; then, from multidisciplinary viewpoint, the research architecture is divided into multi-dimensional structural characteristics and evolution of users’ rational behaviors. Finally, from application perspective, MSNs are categorized into two areas: Socially inspired mobile networking technologies, and enhanced real social life with mobile computing (people-centric tasks and place centric tasks). Briefly, this paper organizes the isolated topics and systems in existing work into meaningful categories, and structures the design space for identifying social-technical challenges, inspiring potentially interesting social networking applications, and suggesting important research opportunities.     

A project-based approach to teaching research writing to nonnative writers

It is commonly accepted that writing instruction should meet the specific needs of writers and that students in scientific and technical fields benefit more by learning to write to match the requirements of their specific fields. A variety of models for writing classes have been proposed to meet these needs, from genre-based approaches to courses targeting specific disciplines to general courses serving a heterogeneous group of students from many disciplines. Although persuasive arguments can be made for discipline-specific writing courses, many writing courses for nonnative writers at U.S. universities operate with two key constraints. First, monetary and curricular limitations mean that students from a variety of disciplines are placed in the same course. Second, these courses are staffed by instructors who, while well-prepared in addressing language needs of nonnative writers, may know very little about the content and conventions of engineering and science. This paper discusses a writing course which works within these constraints and has been developed for graduate students who are early in their program of study. In the course, groups of students carry out an original research project as a vehicle to learn professional writing conventions common to research papers in a variety of scientific and engineering fields. In addition, students analyze written conventions in published articles within their fields to raise awareness of how general conventions are worked out in their individual disciplines. General principles for the course are discussed, and samples of successful research topics are provided.     

Interface management

Technology has grown so complex and specialized that no one person possesses the necessary knowledge and experience to know all that is needed. Those professionals that are tasked with managing the design and life-cycle development of today's complex systems and products can only achieve their goal by managing at the interface of both people and technology. These interface experts are known as systems engineers. Systems engineering is the interdisciplinary practice used to design and build complex systems. One of the most powerful tools of this discipline is the management of interfaces. Managing the design of complex technical systems at the interface requires an understanding of many topics, including interface-related issues, resource margin allocation, and technical performance measurement (TPM) techniques. Each of these topics is discussed in the article. The challenges in managing complex hardware-software systems can best be met by paying attention to what happens at the system and subsystem interface. Using the tools and techniques presented here, both project engineers and program managers can readily gauge the health of their development system or product.     

An introductory world energy model

The energy problem has suddenly placed new demands on engineering education. The magnitude of the problem and its resolution through the creative application of scientific and engineering principles will no doubt require that essentially all new engineering graduates have some background in basic concepts pertaining to energy production, distribution and utilization. These three aspects of the energy problem in turn suggest the necessity for some background in relevant economics and social factors (e.g., the demand for energy to maintain present life styles) as essential for an understanding of the energy problem. To this end, a world energy model and associated computer simulation are proposed as a medium for providing engineering graduates with the required background. The model contains the essential elements of the supply/demand interaction for five major sources of energy, with intersource competition; the model, however, is of modest complexity so that students are not overwhelmed with detail. The computer program is, therefore, well suited for individual and group study of the key parameters which influence the world energy situation through interactive computer simulation. Students can thereby gain insight and understanding of the principal characteristics of the energy problem. The model is continuous (i.e., an initial value problem in ordinary differential equations), and typically runs through the 50-year period 1970-2020 via low-order Runge-Kutta numerical integration. The coding is in standard Fortran IV so that it is essentially machine independent. The program can, therefore, be readily exchanged by engineering educators.     

Little Words That Matter: Discourse Markers "So" and "Oh" and the Doing of Other-Attentiveness in Social Interaction

The article presents an analysis of actual, recorded social interactions between close familiars with the goal to describe discursive practices involved in showing engagement with the other party, or other-attentiveness. Focusing on the deployment of the discourse markers "so" and "oh" in utterances that launch new conversational topics, the article demonstrates that "so" overwhelmingly prefaces other-attentive topics, whereas "oh" prefaces self-attentive topics. We consider the interactional implications of this distribution and how the basic meanings of these linguistic objects are employed in the service of communicating interpersonal involvement.     

Using discretization and Bayesian inference network learning for automatic filtering profile generation

We develop a new approach for text document filtering based on automatic construction of filtering profiles using Bayesian inference network learning. Bayesian inference networks, based on probability theory, offer a suitable framework to harness the uncertainty found in the nature of the filtering problem. In order to learn the networks effectively, we explore three different techniques for discretization. Good features of high predictive power are automatically obtained from the training document content. Our approach does not need to know in advance the subject or content of documents as well as the information needs expressed as topics. A series of experiments on a set of topics were conducted on two large-scale real-world document corpora. The empirical results demonstrate that our Bayesian inference network learning with advanced discretization achieves better performance over the simple naive Bayesian approach.     

Social media,social integration and subjective well-being among new urban migrants in China

The current generation of migrants in Chinese cities, named “new urban migrants,” is closely related with social changes in today’s China. As these urban migrants are increasingly dependent on new media, particularly social media for news, entertainment, and social interaction, it is important to know how social media use contributes to their social integration and subjective well-being. Based on an online survey, this study identified positive relationship between new urban migrants’ social media use and their subjective well-being, as well as the possible indirect relationship through social integration. The overall positive socio-psychological effects of social media use within Chinese urban migrants were found. Specifically, this study revealed that social media use can contribute to their social integration, including their building of social identity and social network as well as real-world social participation. New urban migrants’ social integration, particularly their level of social identity, is significantly associated with their subjective well-being.     

Interdisciplinary MS program in telecommunications at the university of Colorado

The MS degree at the University of Colorado is a broad-based program involving the social sciences, journalism, law, and engineering. It includes a hands-on lab and a thesis requirement. Thus, the graduates have more than a paper familiarity with the technology and they know how to communicate ideas. The program has strong support from industry and government.     

“工程电磁场”课程教学方法探讨

"工程电磁场"课程基本概念抽象,对数学知识要求高,课程涉及问题复杂。笔者从边值问题BVP入手,应用Matlab软件和ANSYS软件,以课堂仿真例子来展示建立边值问题的基本概念,通过仿真作业提高学生对边值问题求解过程的系统了解,以实验的方式提高学生学习兴趣,巩固其理论知识,并结合工程问题为仿真作业和实验建立了丰富的边值问题库。     

The historical roots of concurrent engineering fundamentals

This paper explores the history of the ideas behind concurrent engineering from the end of the 19th Century until the 1960s. Concurrent engineering is the relatively recent term that is applied to the engineering design philosophy of cross-functional cooperation in order to create products that are better, cheaper, and more quickly brought to market. The principles of concurrent engineering that are traced by this paper are: manufacturing and functional design constraints need to be considered simultaneously; combining of people with different functional backgrounds into a design team is a useful way to combine the different knowledge bases; engineering designers must bear in mind customer preferences during the design process; and time to market is an important determinant of eventual success in the market. None of these principles is by itself surprising; concurrent engineering has led to their propagation to many people and firms in the engineering world. The author has examined the engineering literature in order to locate the existence of similar themes in published engineering thought. All of these themes have recurred often in the literature. Concurrent engineering can be seen therefore as a summary of best practice in product development, rather than the adoption of a radically new set of ideas. The paper suggests some reasons that concurrent engineering ideas may not have been adopted more widely     

Systems engineering education

The article discusses some basic principles underlying systems engineering, and the translation of these principles to practices such as to enable the engineering of trustworthy systems of all types that meet client needs. The article is concerned with systems engineering education. Thus, it is inherently also concerned with systems engineering, as this provides a major component of the material that is important for systems engineering education. After setting forth some of the necessary ingredients for success in systems engineering, we devote some comments to objectives for and needs in systems engineering education     

利用多协议标记交换技术实现IP网的流量工程

文章概述了基于集成模式的新一代技术——多协议标记交换技术(MPLS)产生的原动力及其良好的应用前景,并通过对IP网络中流量工程技术发展阶段的分析,比较了各种流量工程技术的差异及优缺点,重点研究了基于MPLS技术实现IP网络中流量工程的工作原理,并以深训市IP城域网为例作了具体说明。     

新工科背景下“电力电子技术”实践教学改革

新工科背景下电力电子技术的实践教学的改革和创新势在必行。电力电子实践教学改革以电力电子变换器拓扑分析、设计、模拟仿真、实验等过程进行问题导向学习,让学生更深入了解电力电子变换器的原理和特性,注重培养学生从理论、仿真、实践的进阶式开发设计能力。本文以基于PEK-110的谐波电流源设计与实现为实例,阐述电力电子创新实践教学的全过程。实践证明,电力电子实践教学改革满足工程教育创新和新工科建设的发展要求。     

Comments on the Design and Manufacture of Dual-Mode Reciprocal Latching Ferrite Phase Shifters

The design principles for dual-mode reciprocal latching ferrite phase shifters are relatively well understood at present. Discussions of a few selected topics not previously studied are presented in this paper. A tradeoff analysis is carried out for X-band units to show the interrelation between phase-shifter weight and insertion loss. An interesting consequence of this analysis is the theoretical prediction of an optimum range of values for the saturation moment of the ferrite material. Switching energy in the presence of shorted-turn damping is also analyzed and related to the geometry and hysteresis loss of the ferrite material. Finally, a discussion of manufacturing considerations and unit cost at high rates of production is carried out. The major conclusion is that unit cost levels approaching $10.00 are possible for a production run sufficiently large to justify the substantial cost of engineering and tooling for high rates of manufacture.     

Gathering innovative end-user feedback for continuous development of information systems: a repeatable and transferable e-collaboration process

Receiving innovative end user feedback on an information system is essential for acquiring further development ideas. The feedback gathering method should encourage end users to freely bring out new ideas. The method should be repeatable and transferable to allow its use in various contexts. We employ the principles of collaboration engineering using so-callled thinkLets as building blocks to construct a feedback gathering process. We apply the principles for receiving new development ideas for a multi-university student information system in Finland. We reflect on the experiences and give insights on applying two alternative processes in a complex organizational context.     

R&M 2000 The Engineering Connection

This paper introduces 5 principles and 21 associated building blocks representative of successful approaches used within industry to produce reliable and maintainable systems. Several building blocks are singled out for discussion because of recent initiatives undertaken by the Air Force. These topics include modularity, technician transparency, simplification, computer-aided tools, and environmental stress screening. The 21 building blocks provide a strong foundation upon which to build weapon systems with increased combat capability. The requirement to maintain the designed-in reliability and maintainability (R&M) attributes through careful attention to quality control issues also receives emphasis. Those factors which most strongly influence variability in the desired system performance must be identified. Finally, the paper emphasizes the crucial role of education in truly integrating the design aspects of R&M into engineering disciplines.     

Peer Review Anew: Three Principles and a Case Study in Postpublication Quality Assurance

Over the last 15 years, the Internet has enabled new modes of authorship, new forms of open licensing and distribution, and new forms of collaboration and peer production to flourish. But in turn, new anxieties have arisen, especially concerning quality assurance, peer review, reuse, and modification. New innovations are appearing in peer review, endorsement, the measurement of trust, and the understanding of reputation, but without any systematic analysis of the general principles of quality assurance and peer review in this new era. In this paper, we propose a general set of principles for understanding what peer review was in the past and how it should be applied today to different kinds of content and in new platforms for managing quality. The principles stress an analysis not only on the content in materials but also on their context of use. Our focus is on open educational resources, and we present a case study of the open education project Connexions' lens system for quality assurance and review. However, the principles can be applied across multiple levels of knowledge production, including scholarship in engineering and science and reference materials in addition to educational publishing.     

国家自然科学基金科学传播体系构建研究

经过25年的发展,国家自然科学基金现已成为国家知识创新体系的重要组成部分,为我国在基础科学多个领域赶超世界先进水平提供了强有力保障,支撑着我国社会科学事业的持续创新发展。通过不断探索与实践,积累了丰富的科学基金管理经验,形成了具有中国特色的科学基金管理制度。通过国家自然科学基金的资助,由项目申报到结题过程中形成的成果、人才、平台等信息,构成了一个庞大的科学信息库。国家自然科学基金的科学传播应以政府管理层、科学家群体、社会公众对科学基金信息的诉求为出发点;运用现代科学传播方法和不同传播媒介,有效构建新型的科学传播体系,以科技新闻报道为主体,多种科学传播形式综合运用,向社会广为传播;在营造科技创新的社会环境、促进社会科学事业的加速发展。同时,使政府、科技界和全社会对科学基金工作有一个全面的认识,推动科学基金未来更好地发展;自然科学基金科学传播应遵循针对性原则、客观性原则、时效性原则和保密原则;科学传播要注重多种媒体组合宣传和宣传时机及时段,强调"内宣"与"外宣"的有效结合,充分发挥主流媒体和科技媒体的组合传播效果。