简单实用的近程双机通讯技术

应用互连技术连接两台计算机，不仅可以实现双机通讯，而且可以实现近程计算机之间系统资源的共享。本着降低设计成本、缩短设计周期、便捷实用的原则，文章介绍了Windows98本身所具有的进行双机通讯的三种方法。     

Sim Wall： a practical user-friendly stereo tiled display wall system

SimWall is a user-friendly, stereo tiled display wall system composed of 18 commodity projectors operated by a Linux graphics cluster. Collaborating together, these projectors work as a single logical display capable of giving a high-resolution show, large-scale, and passive stereo scene. In order to avoid tedious system setup and maintenance, software-based automatic geometry and photometric calibration are used. The software calibration is integrated to the system seamlessly by an on-card transform method and is transparent to users. To end-users, SimWall works just as a common PC, but provides super computing, rendering and displaying ability. In addition, SimWall has stereoscopic function that gives users a semi-immersive experience in polarized passive way. This paper presents system architecture, implementation, and other technical issues such as hardware constraints, projectors alignment, geometry and photometric calibration, implementation of passive stereo, and development of overall soft- ware environment.     

Freedom and Privacy in Ambient Intelligence

This paper analyzes ethical aspects of the new paradigm of Ambient Intelligence, which is a combination of Ubiquitous Computing and Intelligent User Interfaces (IUI’s). After an introduction to the approach, two key ethical dimensions will be analyzed: freedom and privacy. It is argued that Ambient Intelligence, though often designed to enhance freedom and control, has the potential to limit freedom and autonomy as well. Ambient Intelligence also harbors great privacy risks, and these are explored as well.     

光子晶体应用分析

光子具有高传输速度、高密度及高容错性等优点,光子代替电子作为信息载体是二十一世纪信息技术的发展趋势。本文主要介绍了光子晶体的结构特征和应用前景。     

放大电路反馈组态的简易判别

反馈类型的分析判断是放大电路中的重要问题,也是教学中的难点问题之一.单纯按现行的各种教科书所叙述的方法去讲解分析,学生的认识较易发生混乱现象.本文从电路的结构实质出发,提出一些新的分析方法,使得叙述过程更为准确科学,理解起来也更为简单明了.     

浅析多媒体教室的设备配置

随着科学技术的发展,在学校利用多媒体教室进行教学活动,已成为学校的潮流。多媒体设备的生产厂家众多,为满足不同的需求产品五花八门,不同型号之间的参数不可比。如何选择多媒体教室设备配置,对学校的资金投入和教学效果有很大的影响。     

Dividing at an early age: the hidden digital divide in Ohio elementary schools

Computers are now a ubiquitous part of US elementary school education. With policy reports suggesting that inequities in information and communication technology (ICT) access across US schools are a thing of the past, investigating how such resources and their use may nonetheless continue to vary becomes all that much more important. Through a survey of a statistically representative sample of teachers in Ohio, this research examined computer use among third grade students, including in relation to an array of ICT resources and other key factors. The results indicated that such use was more sophisticated among students in affluent suburban schools when compared to students in all other locations, including various rural and urban locations. These differences were correlated with numerous ICT resource discrepancies. Overall, the discrepancies in ICT use and resources can be understood as not only symptomatic of persistent, broader social inequalities, but also factors that reinforce such inequalities as well.     

Evaluating the use of computers in science assessment: Considerations and recommendations

The use of computers in science assessment is viewed through the eyes of the program evaluator by examining six considerations: (1) purpose of computer use in assessment, (2) value of program evaluation models, (3) possible harmful side effects of assessment, (4) nature of imbedded questions, (5) definition of treatment, and (6) computers and the classroom context. Following a discussion of the considerations, four recommendations are offered in regard to continuing to study the use of computers for assessment (examples provided), utilizing the ideas contained in program evaluation models, capitalizing on several interesting, novel possibilities for evaluation design, and combining qualitative and quantitative techniques (mixed methodologies) into the evaluation procedures.     

Conceptually enhanced simulations: A computer tool for science teaching

In this paper, we consider a way computer simulations can be used to address the problem of teaching for conceptual change and understanding. After identifying three levels of understanding of a natural phenomenon (concrete, conceptual, and metaconceptual) that need to be addressed in school science, and classifying computer model systems and simulations more generally in terms of the design choices facing the programmer, we argue that there are ways to design computer simulations that can make them more powerful than laboratory models. In particular, computer simulations that provide an explicit representation for a set of interrelated concepts allow students to perceive what cannot be directly observed in laboratory experiments: representations for the concepts and ideas used for interpreting the experiment. Further, by embedding the relevant physical laws directly into the program code, these simulations allow for genuine discoveries. We describe how we applied these ideas in developing a computer simulation for a particular set of purposes: to help students grasp the distinction between mass and density and to understand the phenomenon of flotation in terms of these concepts. Finally, we reflect on the kinds of activities such conceptually enhanced simulations allow that may be important in bringing about the desired conceptual change.     

论傻子视角的现实性平行与边缘性交叉

阿来《尘埃落定》中的“傻子”是土司制度巩固、走向瓦解的参与、思想、见证人，是作品在历史的厚重中凸显空灵的灵魂人物，他以其自我审视与历史审视的眼睛，既显示出他对土司权力的略带侥幸的患得惠失的不懈图谋，又显示出他长远瞩望不得其真的无奈，他只能无可奈何地站在广漠历史天幕下踟躇独行，矛盾重重地成了一个历史“化亡灵”的记忆。