合作学习在中职信息教学中的应用

合作学习理论作为一种新的学习理念已经被广泛地运用到各类学校的学习当中,经过不断地实践检验取得了不错的效果。将合作学习的相关理论运用到实践能力要求较高中职信息技术教学中,不仅可以增强学生的学习能力,通过合作学习培养学生之间互相帮助、共同进步的精神,提高他们信息技术学习的水平,还可以培养他们的团队精神,适应将来的就业需要。     

防火墙在组建局域网中的应用

防火墙作为网络安全设备越来越多地应用于局域网络与公用网络的互联中,具有服务代理、包过滤、入侵检测等功能。防火墙作为一个网络互连设备,在组建网络中还有着局域网与Internet互联、隐藏防火墙外网IP地址、隐藏内部网络、IP地址重定向、安全访问控制以及构建VPN等应用。文中结合某单位的局域网规划设计就防火墙的应用作了重要的阐述。     

大数据环境下我国被遗忘权之立法构建——欧盟《一般数据保护条例》被遗忘权之借鉴

在记忆成为常态,而遗忘成为例外的大数据时代,欧盟数据改革提出的“被遗忘和删除权”备受各方关注和争议.本文通过探讨被遗忘权对个人信息保护的重要意义,研究欧盟《一般数据保护条例》草案中“被遗忘和删除权”的具体内容,分析我国现阶段删除权的法律现状及缺陷,提出大数据环境下我国被遗忘权的立法构建,以期提高个人信息在线环境的安全性.     

低碳经济时代的建筑之道

低碳建筑是营造可持续发展未来的关键。本文通过对低碳建筑的全面分析以及对全球知名的设计实例的分析,探讨适应低碳经济时代的建筑发展的方向、目标,指出低碳建设和设计要走向集约型、走向自然、走向效率设计、走向适应性设计、走向循环设计、走向智能化设的发展途径,以及低碳建筑未来的发展方向。     

电话自动监控瓦斯报警器研究与开发

新型电话自动监控瓦斯报警器是在固定式瓦斯报警器的基础上开发研制出来的。它具有在瓦斯浓度超限时进行声光报警功能，同时还具有电话自动监控功能。使煤矿安全官员对基层煤矿负责人、安监员、矿主等人员的失职行为进行监管，避免人为因素造成的瓦斯爆炸事故发生。该文介绍了新型电话自动监控瓦斯报警器的组成结构，对其工作原理进行了详细的分析。     

在教育中加强网络意识

随着当代信息技术向中小学教育的扩展,校园网络的建设已成为许多学校的议事日程。计算机网络应用到教育中,不但有利于激发学生产生主动学习的兴趣,而且还有利于学生综合能力的培养,同时计算机网络的便捷性也有利于提高远程教学质量。所以我们要依托校园网,营造数字化的校园环境,综合利用各种教学方式,充分发挥网络教学的优势,以获得最佳的教学效果。     

Numerical Treatment of the Loss of Hyperbolicity of?the?Two-Layer Shallow-Water System

This article is devoted to the numerical solution of the inviscid two-layer shallow water system. This system may lose the hyperbolic character when the shear between the layer is big enough. This loss of hyperbolicity is related to the appearance of shear instabilities that leads, in real flows, to intense mixing of the two layers that the model is not able to simulate. The strategy here is to add some extra friction terms, which are supposed to parameterize the loss of mechanical energy due to mixing, to get rid of this difficulty. The main goal is to introduce a technique allowing one to add locally and automatically an ??optimal?? amount of shear stress to make the flow to remain in the hyperbolicity region. To do this, first an easy criterium to check the hyperbolicity of the system for a given state is proposed and checked. Next, we introduce a predictor/corrector strategy. In the predictor stage, a numerical scheme is applied to the system without extra friction. In the second stage, a discrete semi-implicit linear friction law is applied at any cell in which the predicted states are not in the hyperbolicity region. The coefficient of this law is calculated so that the predicted states are driven to the boundary of the hyperbolicity region according to the proposed criterium. The numerical scheme to be used at the first stage has to be able to advance in time in presence of complex eigenvalues: we propose here a family of path-conservative numerical scheme having this property. Finally, some numerical tests have been performed to assess the efficiency of the proposed strategy.     

A luddite in cyberland,or how to avoid being snared by the web

Advocates of the World Wide Web speak in glowing terms of its ability to provide greater access to information resources and to promote active reading and learning. Furthermore, students are now encouraged to construct Web pages, using hypertext as an alternative to traditional linear written documents. Although the ability to navigate the Web and to construct Web pages is not without merit, instructors who emphasize these skills are likely to sacrifice the stated objectives of most composition programs: to help students learn to write clear, coherent prose, to read critically and analytically, and to conduct meaningful research.     

提高计算机信息系统维护效率的策略探讨

计算机信息系统提升了整个信息时代的高速运转,帮助人们完场信息的采集、处理、存储、传输、检索等工作。如何帮助计算机用户节约更多的时间,是计算机信息系统维护工作需要继续改善的问题,抓住时间的时效性,提高信息的使用价值,就体现在这里。本为,问们将就如何提高计算机信息系统维护效率问题进行一系列的探讨分析。     

A personal chronicle: creating better information systems, withsome guiding principles

The author identifies four guiding principles which have come into play in this work of creating information systems and tools to support information systems. The first principle, open-eyes, is used to characterize information systems that remain open to new information, and consequently can compensate for changes in their mission or inaccuracies in their execution of that mission. The second principle involves abstraction levels, which in information systems are similar to differentiation in calculus. They are used to study the changes within a group of heterogeneous objects, with respect to an object type classification, so as to understand and make use of their patterns and ultimately to control the new objects of each type. The third principle, layered architecture, is used to identify a pattern of successive reimplementations of a set of functions, so as to isolate specific environmentally oriented issues. The fourth principle involves relationships, used to define associations between objects and constraints on those associations and to provide access to objects based on their associations. Reference is made to several specific projects which revealed the operation of these principles     

A standard on human response to vibration — one of a new breed?

Human response to vibration is used as an example for consideration of the requirements of standards in the human factors field. It is suggested that standards relating to people may be concerned primarily with the design of equipment for optimum satisfaction of users, and that this demands a different approach to standards if they are to be effective. It is argued that a clear distinction should be made between standards intended to protect people from harmful conditions, standards intended to minimise the risk of people being harmed, and standards intended to give advice and information. In the case of human response to vibration it is suggested that standards should relate to agreed methods of measurement and assessment, limitations to preserve health, limitations to be applied in specific situations in order to prevent the risk of accidents, together with a data base for designers to work from.     

某型导弹虚拟训练系统操作训练动作设计

对视景仿真软件Vega和DI—GUY人体仿真软件进行了介绍,从工程应用的角度,阐述如何实现虚拟人在场景中的漫游,将DI—GUY人体模型做了适当的修改,提出了一种基于空间定位装置的虚拟入手臂控制方法,给出了方法的具体实现步骤,以及空间定位装置对于本系统的具体应用方法,给出了如何设计手部的碰撞检测的方法,以便进行操作动作的训练,选取要操作的对象物,并对如何应用数据手套形成手部操作训练动作进行了介绍。     

基于.NET的数据访问策略

为了实现基于.NET构架的高效数据库访问，文中介绍了基于.NET构架的四种数据访问策略，并解释这些策略对连接数据源的条件限制以及数据库读取方式的内部运行机制。然后给出具体实例，说明如何实现其中的两种策略，并附上机运行结果。最后，比较这些数据访问策略的特点，分析总结出各种策略适用环境。     

模型参考自适应控制方案对建模误差的鲁棒性局限

在现有模型参考自适应控制(MRAC)方案的结构下,不可能通过设计调节参数规律来 增强对平衡点一致渐近稳定(u.a.s)的自适应控制系统对建模误差的鲁棒性.本文通过研 究能保证系统u.a.s.的一般形式的调节参数规律下的自适应控制系统对建模误差的鲁棒稳 定性,得出了现有MRAC结构对I型建模误差具有鲁棒性,对II型建模误差没有鲁棒性的 结论.     

微机监测与铁道信号设备安全

目前我们铁路运输事业快速发展,全国各地都新建了高铁铁路。速度是提升了,安全问题也不能忽视。列车在运行过程中要想保证安全,就需要铁道各处的信号信息正确。控制台通过相关的信号设备将运行的指令传递给列车,以保证铁路的整体运行情况。在新的时期,需要能够全天候检测铁路安全的方法,以便维修人员能够及时了解问题并处理。本文通过对TJWX-2006型信号设备监测系统进行研究,来分析在铁路上使用微机来检测铁路的运行情况。这对研究信号设备安全有着积极的意义。     

The integration of theory and practice in teaching designing for the screen

Future typographic and graphic designers will need to be able to design for a range of media, both to secure their role and to provide the necessary design expertise in technological environments. This paper proposes an approach to teaching which introduces theoretical issues within a practical design project to encourage the development of general concepts that can be transferred to different technologies. A specific project on designing for the screen is described, which is taught as part of a BA degree in Typography & Graphic Communication. In the context of this project, reasons for introducing theory are proposed, examples of the nature of the theory are given, and the methods used to introduce material are illustrated. A detailed account of one student's implementation of this project is used to demonstrate how theoretical issues can provide direction in a design task. However, careful consideration needs to be given to how theory and practice are integrated to encourage students to look beyond the short-term benefits of specific training to the development of more general knowledge.     

A boundary-sensitive approach to qualitative location

Reasoning about the location of regions in 2-dimensional space is necessarily based on finite approximations to such regions. These finite approximations are often derived by describing how a region (the figure) relates to a frame of reference (the ground). The frame of reference generally consists of regions, or cells, forming a partition of the space under consideration. This paper presents a new approach to describing figure-ground relationships which is able to take account of how the figure relates to boundaries between cells as well as to their interiors. We also provide a general theory of how approximations to regions lead to approximations to operations on regions. This theory is applied to the case of our boundary-sensitive model of location. The paper concludes by indicating how interpreting boundaries in a more general sense should lead to a theory dealing with generalized partitions in which the cells may overlap. The applications of the theory developed here will include qualitative spatial reasoning, and should have practical relevance to geographical information systems. This revised version was published online in June 2006 with corrections to the Cover Date.     

经典造就时尚——谈谈当今设计与新现代主义

回顾当今设计领域的各种思潮,不同的风格流派给设计师们带来了多角度的启示。本文追忆了由现代主义到后现代主义再到新现代主义的发展历史,然后把它与当今的时尚文化联系起来,探讨了在时尚变幻的时代,设计领域要追随哪一种风格,设计师们究竟要做什么样的设计,是时尚创造了好的作品,还是经典之作成就了时尚的发展文脉。     

浅析如何利用现代计算机技术优化高中政治课教学

随着科技的发展,以往的高中政治课程教学方法已无法满足当前的需求。教职人员需要利用计算机技术对政治课程教学进行优化,以期提高教学效果。本文简要针对高中政治课堂教学应用计算机技术的方法及需要注意的问题进行分析,目的在于进一步提高教学质量,帮助学生完善自身发展。     

Design techniques of a computer program for the identification of processes and the simulation of water quality in aquatic systems

In order to support environmental scientists in finding an “adequate” model for the system they are investigating, a computer program is necessary that allows its users to perform simulations for different models, to assess the identifiability and to estimate the values of model parameters (using measured data), and to estimate prediction uncertainty. These requirements, especially that of providing much freedom in model formulation, are difficult to realize in such a program. In this paper, it is shown how object-oriented program design techniques were employed to facilitate the realization of an identification and simulation program for aquatic systems (AQUASIM) that is very flexible with regard to model formulation and that provides methods of sensitivity analysis, parameter estimation and uncertainty analysis in addition to simulation. It is the goal of this paper to encourage developers of environmental software to revise previously used program structures and to employ modern program design techniques.