反垃圾邮件个垒打

近两年来，垃圾邮件大量泛滥，不断改头换面，以躲避过滤，魔高一尺；反垃圾邮件技术推陈出新，增强智能别技术，道高一丈。令人汗颜的是，垃圾邮件与病毒为伍，让传统反垃圾邮件技术措手不及。随着安全技术介入，垃圾邮件再次败下阵来。但战争并未结束，垃圾邮件时刻积续力量，准备反攻。俗话说，知己知彼，百战不殆。如若防范垃圾邮件，必须知晓垃圾邮件入侵的突破口，以及恰当的过滤手段。事实上，客户端和邮件服务器是垃圾邮件传播和落脚的根据地，如若横扫“垃圾”，必须直击客户端和邮件服务器。客户端主要靠个人用户维护，邮件服务器端则靠网管维护。现在，我们从这两个角度，讲一讲防范垃圾邮件全套攻略。     

美工系列讲座10讲——游戏制作之角色模型（一）

人类拥有想象力与创意，是创意再造人类的生活，随着虚拟角色的出现，人们开始注意到电脑表现自我的重要性，电脑虚拟角色的诞生，组成了新的生活空间，人们在真实规则，规律的空间中需要情感的宣泄，迷茫的情绪需要精神的寄托，于是，许多人选择了网络的生活空间，虚拟角色便成为了另一个空间中的自我，朋友，恋人，敌人……     

网络毒瘤之蠕虫病毒

近年来，蠕虫，病毒的名声简直是如日中天，引发的安全事件此起彼伏，且有愈演愈烈之势，从2001年爆发的CodeRed蠕虫，Nimda蠕虫，SQL杀手病毒（SQL SLAMMER蠕虫），到近日肆虐的“冲击波”，“震荡波”，无不含有蠕虫的影子，且开始与病毒相结合。     

休闲娱乐的诛仙玩法

游戏之前，刚刚结束了一段一年多的感情，一年多的时间，耗去了我所有的激情和笑容，在他眼里，我好强独立不懂得依赖，甚至在提出分开的那一刻，我依旧平静如水，安静的问，你确定吗？至始至终，我未曾在他面前落泪，只是分开以后，常常整夜整夜的失眠，然后咬住枕头，压抑着低声哭泣。那么长一段时间里，我都渴望着自己睡了之后就不再醒来，     

招聘启事

一家大公司在报纸上刊登了招聘公关的启事，要求非常高：女性，未婚，没有男友，22周岁，身高一米七，名牌大学中文系本科毕业，长相甜美，笑起来有酒窝，身材苗条，腰围一尺八，乌黑长发，没有染过，气质优雅，有大家闺秀的风范……     

口诀——记忆的妙法

在初中学生学习物理的过程中，有大量的知识点需要去记忆，但有一些枯燥的知识和一些较易混淆的知识，学生在记忆时，难度是相当大的，往往是靠机械记忆，不仅一时难以记住，而且暂时记住了，过一段时间，又会迅速遗忘。同时，如果需要学生记忆的内容太多，会使学生对这门功课失去兴趣，久而久之，学习成绩就会下降。     

洋手机的本土化之路

一个人离开原来的生存环境到一个全新的地方去，不管是生理上还是心理上，总会有这样或那样的不适，根据个体差异，适应程度有轻有重，我们把这称之为水土不服。轻的稍微调整一下就能渐入佳境，直至如鱼得水，重的可能无法适应，只能被淘汰或自动离去，更严重的甚至可以致命。当然也有不轻不重的，这种生存状态有如鸡肋，离去吧，可惜，留下吧，无味，这种情况属于找不到感觉型的，他们既可以突然找到感觉，也可能最终黯然离去。到底何去何从，就要看企业的觉悟能力了。     

AS-Interface接口技术及应用

阐述了AS-Interface(Acturator Sensor Interface，简称AS-I)接口技术的特点及其在自动控制系统中的应用。介绍了AS-I接口技术的主要特性，产品的主要构成。分析了接口基本内容和AS-I模块，给出了AS-I的两种典型应用方案。可以看出，AS-I是一个传感器．执行器—接口的技术，用两芯电缆传递数据和电源，用于自动化控制层的最底层，用简单经济的方式将二进制的数字化执行器和传感器连接起来，既可以直接连接到控制箱中，单独或与PLC，IPC一起独立就地运行；或与上层现场总线(Profibus，Interbus，DeviceNet，CAN，Modbus，Modbus ，CC—Link，Ethemet等)相连，作为现场总线的一个分支，应用于网络系统，从而满足工业控制的各种要求。     

网络游戏代练者的真实生活状态素描

他们，生活在网游都市的边缘，苍白，神秘而饱受争议：他们，又生活在现实都市的边缘，灰色，劳累，为了生计夜以继日。游戏中，你是否曾经对他们感到厌恶甚至愤怒？外挂、刷屏、抢怪、抢金，欺诈，仿佛所有的罪恶箭头都指向他们。然而，你是否想过，屏幕前坐着的，不是面无表情的机器，而是一个个活生生的灵魂和他们肩上的责任…一。这就是他们，网游打金者!     

Radio 收音机

Radio，这种古老的传播方式在互联网的时代看似有些out，但是现在不少人逐渐又爱上了收听广播，随意，无拘无束，不过很多手机都简化掉了收音机模块，没关系，只要有网络，通过收音机类的App，不仅能听到本地的电台，而且还能收听到全世界的广播节目。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

正~~     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate