Why is S a Biased Estimate of σ?

This article outlines an experiment that leads one to discover and verify that S is a biased estimator of σ.     

从《黑暗的心》管窥康拉德后殖民书写的矛盾性--一种霍米·巴巴视角

康拉德文化身份的混杂性和他的多元文化经历共同造就了其作品后殖民书写的矛盾性。以《黑暗的心》为例,该作品中人物形象的混杂性揭示了殖民主义的虚伪性,同时反映了康拉德对殖民主义的矛盾态度以及西方话语对东方“他者”既爱又恨的矛盾情感;《黑暗的心》所表征的殖民话语的含混性揭示了殖民地历史的复杂性,殖民者和被殖民者既共谋又对抗的复杂关系消解了殖民权威;库尔兹的人生悲剧映射出殖民主义与生俱来的矛盾;“模拟”本来是殖民统治的策略,但最后却成为被殖民者反抗殖民压迫的有力武器。     

水平电偶极子在覆盖有等离子体的良导体上产生的电磁场的研究

本文研究了水平电偶极子在覆盖有等离子体的良导体上产生的电磁场。总电磁场包括了直射波,理想反射波,侧面波和缺陷表面波。因为等离子体的折射系数是随频率变化的复杂函数,所以用于计算缺陷表面波的极点函数的解也是频率的函数。研究了频率对极点方程及其解的影响,并分别计算了直射波,理想反射波和侧面波之和、总场强、以及缺陷表面波的值。由于金属表面的介电常数可以在很宽的频率范围内表示为等离子体,所以本文的研究成果可以用于集成微带线电路或者微带天线等。     

Intercultural sensitization with synthetic cultures: Evaluation of a computer-based multimedia learning tool

The purpose of the present study was to evaluate a new computer-based multimedia learning tool for intercultural sensitization that is based on synthetic cultures. The learning tool named “Culture Awareness Training” (CAT) is targeted at learners with few intercultural experiences, and its aim is to sensitize participants to cultural influences on behavior and to intercultural differences, and to enhance perspective taking. Two studies were conducted to evaluate the effectiveness of the CAT. Study 1 (N = 107) showed that participation in the CAT led to higher intercultural awareness and higher intercultural interest compared to a control group. In Study 2 (N = 46), the CAT was compared to a simulation game for intercultural sensitization. Participants were students shortly before their stay abroad. Results showed that both the CAT and the classical simulation game enhanced participants’ cultural awareness.     

基于MATLAB/SIMULINK的QDPSK通信系统仿真

利用MATLAB平台的SIMULINK功能编写了一套QDPSK通用功能模块库,并在此基础上进行了多项可视化仿真,较好地显示了数字通信的工作方式和优越性,以及采用SIMULINK进行仿真的良好的演示效果,为QDPSK数字通信系统的研究提供了一个较好的软件平台。     

Verteilungsmodelle für Workflow-Management-Systeme – Klassifikation und Simulation

Zusammenfassung.   In unternehmensweiten Workflow-Management-Systemen (WfMS) kann die von der WF-Engine zu bew?ltigende Last sehr gro? werden. Au?erdem werden hohe Anforderungen an die Verfügbarkeit eines solchen Systems gestellt. Deshalb wurden in der Literatur zahlreiche Architekturen für skalierbare WfMS vorgeschlagen, die auf unterschiedlichen Verteilungsmodellen für die WF-Engine basieren. Im vorliegenden Beitrag werden diese Verteilungsmodelle analysiert, verglichen und klassifiziert. Aufbauend auf diese Klassifikation wird für zwei Beispielszenarien die bei den verschiedenen Verteilungsmodellen entstehende Last simuliert und verglichen. Eingegangen am 12. M?rz 1999 / Angenommen am 8. Oktober 1999     

A critical analysis and evaluation of Web-based environments for program development

This paper provides a classification, review, and critical analysis of current Web-based interactive programming environments and tools that facilitate learning programming languages and concepts. The focal point of the paper is based on (1) categorizing available programming systems and tools into classes according to their pedagogical approaches; (2) reviewing individual systems; and (3) critically analyzing them according to established standards for instructional design. The paper is intended to provide those seeking to use these resources with a comprehensive survey of the available systems, their succinct evaluation, and their effectiveness.     

等离子体及其应用

本文简要介绍了等离子体的概况、应用及发展前景。     

模拟仿真技术在《计算机网络》教学中的应用研究

计算机网络是一门交叉学科,涉及学科范围广,知识点众多且较为抽象,课程教学及实验难度大。针对在《计算机网络》教学过程中所遇到的问题,提出应将模拟仿真技术大量应用到教学实践当中,并根据教学经验,将模拟仿真技术进行分类,以适应不同层次教学实验的要求。