When elephants dance, mice watch out! [legal issues]

Bristol Technology develops software tools-in particular cross-platform tools that software developers use to port applications software to Unix from other operating system platforms. Bristol had an agreement with Microsoft to get access to technical information about the Win98 application interfaces (APIs), the means for causing applications software to interact with the operating system. According to Bristol, its Wind/U tool was making it too easy for developers to write Unix programs that could also run under NT. Microsoft therefore used pretexts to deny Bristol access to the updated APIs for Windows NT 5, the operating system that will follow Win98 (probably under the name Windows 2000). Microsoft denies that it is doing any more than trying to gain a fair price for the crown jewels of its intellectual property. Yes; Microsoft is demanding four times as high a fee for access to the source code needed to use the NT APIs, but NT code is worth much more than that for Win98 or Win95. The article focuses on the ensuing legal battle between Microsoft and Bristol Technology     

一种新的大型通用分布式服务器架构

目前许多大型应用如电子商务系统、电子邮件系统、企业信息系统等都是基于大型分布式服务器系统。给出了一种新的大型分布式服务器系统架构的设计与实现，该分布式服务器体系结构为各种大型应用系统提供了一个统一的服务器架构和开发模型。它能够高效处理大量并发业务，容易随着系统业务规模扩大而扩展，并且适用于目前所有操作系统和硬件平台。     

基于WMI技术的无代理主机入侵检测系统模型设计*

Windows管理设备（WMI）是微软操作系统的一个组成部分,它是微软的一个基于Web的企业管理（WBEM）的实现。研究并建立了一个基于WMI技术的无代理主机入侵检测系统,很好地克服了传统的基于主机的入侵检测系统在部署和管理方面存在的高成本、低效率的缺点。     

Windows 2000 security: A postmortem analysis

Introduction

After initially releasing Windows 2000 (W2K) in February 2000, Microsoft touted it as a secure operating system, one that was far improved over its predecessor, Windows NT(WNT). Yet even before Microsoft released W2K the software giant announced that it would release Service Pack 1 (SP1) for this operating system. The information security community immediately wondered whether the claims about the much improved security in W2K were true; many events and findings since then have reinforced this doubt. After a reign of three years as Microsoft's flagship operating system, last year Microsoft rolled out its newest server operating system, Windows Server 2003 (WS2003), signaling the end of an era for the W2K operating system. Windows XP (WXP) had already supplanted W2K Professional as the newest workstation operating system several years before. This is not to say that nobody uses W2K any more—to the contrary. But as W2K continues to increasingly take a proverbial back seat to newer Microsoft operating systems, now is a good time to take a retroactive look at W2K from a security viewpoint. Was it a success from a security perspective? What were its major failings and why? This paper addresses these issues.     

Exploiting Application Tunability for Efficient,Predictable Resource Management in Parallel and Distributed Systems

Parallel and distributed computing is becoming increasingly mainstream, driven both by the widespread availability of commodity small-scale symmetric multiprocessors and high-performance cluster platforms, as well as the growing use of parallelism and distribution in networked applications such as image recognition, media processing, virtual reality, and telepresence. However, many of these applications impose soft timeliness and output quality constraints on top of the traditional performance requirements, necessitating efficient, predictable management of system resources. Existing techniques are inadequate to simultaneously support these twin requirements of efficiency and predictability. In this paper, we propose a novel approach for increasing system efficiency while meeting application timeliness and quality constraints. Our approach exploits the application tunability found in many general-purpose computations. Tunability refers to an application's ability to trade off resource requirements over several dimensions including time, quality, and resource type; the resulting flexibility enables the underlying resource management system to choose an application operating point best suited to available resource characteristics. We describe language and scheduler extensions to support tunability in the MILAN metacomputing environment and then systematically characterize performance benefits of tunability using a parameterizable task system. Our results show that application tunability is easily expressible and can significantly improve resource utilization.     

Virtual machines for enterprise desktop security

A virtual machine monitor (VMM) allows a single computer to run two or more operating systems at the same time. VMMs are relatively simple and are typically built to high assurance standards, which means that the quality of isolation provided by a virtual machine monitor is usually greater than that which can be achieved with a general-purpose operating system. This paper discusses how the flexibility afforded by multiple OS environments and the robust isolation provided by a virtual machine monitor can be used to improve client PC security. A prototype system is also described.This paper is neither a product announcement nor an official Microsoft position paper, but rather it is a discussion of interesting configuration options that can be constructed using existing Microsoft and third-party products: in this case two or more operating systems running in conjunction with a virtual machine monitor.     

A middleware model supporting time-triggered message-triggered objects for standard Linux systems

The Time-triggered Message-triggered Object (TMO) programming and specification scheme came out of an effort to remove the limitations of conventional object structuring techniques in developing real-time (RT) distributed computing components and composing distributed computing applications out of such components and others. It is a natural and syntactically small but semantically powerful extension of the object oriented (OO) design and implementation techniques which allows the system designer to specify in natural and yet precise forms timing requirements imposed on data and function components of high-level distributed computing objects. TMO Support Middleware (TMOSM) was devised to be an efficient middleware architecture that can be easily adapted to many commercial-off-the-shelf (COTS) hardware + kernel operating system platforms to form efficient TMO execution engines. However, up until 2003, its adaptations were done for Microsoft Windows platforms only. As we have been developing and refining an adaptation of TMOSM to the Linux 2.6 operating system platform in recent years, TMOSM has been refined to possess further improved modularity and portability. This paper presents the refined TMOSM as well as the techniques developed for efficient adaptation of TMOSM to the Linux 2.6 platform.     

人脑电信号实时监测原型系统设计与实现

针对脑部病患突发状况时不能够在最短的时间内预警并发现和监测效率不高的问题,设计了一种基于无线通信技术和LBS的脑电信号实时监测方法,实现对脑电监测仪携带者的位置和脑电信号的实时监测。将GIS技术、无线传输技术、智能移动终端与现有的信息管理平台相融合,提出了人脑脑电信号实时动态监测框架体系结构,并设计开发了原型系统。该系统可将采集到的脑电数据实时显示并传送到服务器端,实现在服务器端的实时监控与动态分析,并对发生异常的情况做出应急响应,为应急救援提供帮助。     

Managing email overload with an automatic nonparametric clustering system

Email overload is a recent problem that there is increasingly difficulty that people have to process the large number of emails received daily. Currently, this problem becomes more and more serious and it has already affected the normal usage of email as a knowledge management tool. It has been recognized that categorizing emails into meaningful groups can greatly save cognitive load to process emails, and thus this is an effective way to manage the email overload problem. However, most current approaches still require significant human input for categorizing emails. In this paper, we develop an automatic email clustering system, underpinned by a new nonparametric text clustering algorithm. This system does not require any predefined input parameters and can automatically generate meaningful email clusters. The evaluation shows our new algorithm outperforms existing text clustering algorithms with higher efficiency and quality in terms of computational time and clustering quality measured by different gauges. The experimental results also well match the labeled human clustering results.

一种绝缘电阻表检定信息管理系统设计

现有绝缘电阻表检定系统的信息查询和记录均由人工完成,效率和智能化程度低;文章以C++Builder 2010为软件开发平台,通过ADO方式连接后端Microsoft Access 2003数据库,构建集电阻信息采集、检定报表生成和检定信息管理于一体的智能化绝缘电阻表检定信息管理系统;重点阐述系统的构成、规划、信息内部操作原理与报表生成过程。用户使用反馈表明,该系统以报表方式形象、直观地显示检定信息,其智能化录入方式减少了人为操作,提高了检定效率。     

An effective multi-layered defense framework against spam

Spam is a big problem for email users. The battle between spamming and anti-spamming technologies has been going on for many years. Though many advanced anti-spamming technologies are progressing significantly, spam is still able to bombard many email users. The problem worsens when some anti-spamming methods unintentionally filtered legitimate emails instead! In this paper, we first review existing anti-spam technologies, then propose a layered defense framework using a combination of anti-spamming methods. Under this framework, the server-level defense is targeted for common spam while the client-level defense further filters specific spam for individual users. This layered structure improves on filtering accuracy and yet reduces the number of false positives. A sub-system using our pre-challenge method is implemented as an add-on in Microsoft Outlook 2002. In addition, we extend our client-based pre-challenge method to a domain-based solution thus further reducing the individual email users' overheads.     

Achieving evenhandedness in certified email system for contract signing

Certified email is a system which enables a sender to prove a receiver’s receipt of email. Such a system can be used for applications related to electronic commerce on the Internet. This paper considers a situation where a sender or a receiver wants to change his/her mind due to the change of mail content value (e.g., stock, auction, gambling) during the transaction. We point out that no traditional certified email systems have been designed for such a case, thus one of the participants can be at a disadvantage. To avoid this problem, we propose an evenhanded certified email system in which each participant can change his/her choice, either cancel or finish the transaction, at any time during the transaction.

“Turn that frown upside-down”: A contextual account of emoticon usage on different virtual platforms

Evidence highlights the prevalent usage of emoticons within digital forms of textual communication and the impact on the recipient. However, little evidence demonstrates the interpersonal functions for the user and whether this varies as a product of virtual platform. This formed the basis for the current study in which participants (N = 92) provided open-ended accounts of their reasons for using emoticons across three virtual platforms (email, text message, and social networking site), and their general emoticon usage across these. Responses revealed a number of themes on reasons for emoticon usage. The first was; “aiding personal expression”, with sub-themes of; “establishing emotional tone”; and “to lighten the mood”. Other themes were “reducing ambiguity of discourse” and “appropriateness of context”. Overall, there was consistency across platforms, on both the personal and interpersonal functions which emoticons served. However, some disparity was identified as email platforms were deemed inappropriate for emoticon use, regardless of the fact that emoticons were recognised as important emotional aids for communication. Taken together these findings highlight the importance of emoticon usage for the user, through a contextual lens to recognise the influential factors upon these behaviours and the implications this has for digital text-based communication. In this regard, this contributes further conceptualisation of one aspect of hyperpersonal communication within virtual interactions, and how different platforms may permit these self-presentational efforts to a greater or lesser extent.     

ECMail:基于实体发现、查找和管理的中文邮件管理系统

随着个人用户的数据和信息级数增长,个人信息管理的研究成为热点.电子邮件作为个人信息的重要载体在个人信息业务中占据着重要的地位.随着个人信息的增加,用户在对邮件进行查询时经常遇到遗忘关键字的困扰,对此普通的邮件工具很难为用户组织和管理个人信息提供帮助.提出了一个基于实体发现、查找和管理的中文邮件管理系统--ECMail,有效改善了以上问题,同时对关键技术-中文分词、实体挖掘和实体关联管理的实现提出了自己的想法和处理机制,最终达到了提高用户邮件管理效率的目的.     

x86服务器虚拟化平台性能测试

提出一种x86服务器虚拟化平台的性能测试系统。该系统支持Xen、VMware ESXi和Microsoft Hyper-V这3种虚拟化平台,可对平台上的虚拟服务器进行性能测试,同时获取虚拟化平台的性能数据。运用该系统对3种虚拟化平台完成性能测试,结果表明,Xen半虚拟化技术具有性能优势,而ESXi的总体表现最好。     

A comparison study of user behavior on Facebook and Gmail

Email is one of the most important communication media to date, and millions of Internet users around the world spend the bulk of their time writing and reading electronic messages. The growing popularity of Social Network Sites (SNS) as a communication medium motivated us to explore the relationship between user behavior on SNS and email. In this paper, we collected objective, privacy-preserved behavior data from participants that were both active Facebook and Gmail users. We show that a large proportion of social interactions still occur through email messages, while participants tend to be more emotional on Facebook. We found that producing more content on Facebook does not necessarily decrease or increase the production of emails. By utilizing the quantitative analysis of usage data instead of surveys, we show that user behavior is likely consistent across SNS and email in some aspects, for example, users with more Facebook friends seem to email to more people, Facebook and Gmail share similar trend of “happiness”.     

电子邮件动态分类系统的研究与应用

电子邮件已成为许多企业开展商务与办公的重要媒介,许多信息都保存在电子邮件系统。对大量邮件的管理,信息分类是一种有效的管理方法,但传统的人工文本分类方式相对静态且耗时较多。针对非结构化的邮件信息管理,提出采用动态分类体系,通过文本挖掘方法,开发一套基于多智能代理架构的电子邮件自动分类系统,提升邮件自动分类的效率。     

智能手机camera应用的设计与实现

当前主流的智能手机平台有Symbian UIQ和Microsoft Windows Mobile,除了以上两种,还有其他一些平台,本文给出了在一种开源平台:linux Qtopia上如何来实现camera应用。Linux Qtopia相对其他平台的优势有两个:一个是开源,需要时你可以对源代码进行的裁剪和修改;另一个是费用低廉,这对企业提高竞争力也有很大的帮助。     

面向英汉词典编纂的粘贴工具的设计、实现及应用

分析和介绍一款用Delphi语言开发的面向英汉词典编纂的粘贴工具的设计、实现和应用。该工具软件依托微软视窗操作系统的进程间通讯机制,实现小巧、方便和实用的设计目标。在英汉词典的编写过程中使用该粘贴工具粘贴或插入频繁用到的特殊符号或专用文字块可以提高工作效率和减少录入错误。     

智能手机camera应用的设计与实现

当前主流的智能手机平台有Symbian＋UIQ和MicrosoftWindowsMobile,除了以上两种,还有其他一些平台,本文给出了在一种开源平台：linux＋Qtopia上如何来实现camera应用。Linux＋Qtopia相对其他平台的优势有两个：一个是开源,需要时你可以对源代码进行的裁剪和修改;另一个是费用低廉,这对企业提高竞争力也有很大的帮助。