CIMS信息集成环境下轧钢企业财务管理系统的实现

以鞍钢冷轧厂计算机集成制造系统开发为背景 ,介绍了基于Client/Server方式 ,以OR ACLE为后台数据库的财务管理系统的设计与实现。运用软件工程和数据库理论 ,结合ORACLERDBMS的特点 ,并对实现方法做了比较全面地论述。最后 ,探讨了通向财务信息集成的途径

CIMS环境下异种数据库互操作平台的设计与实现

本文针对ＣＩＭＳ环境下信息集成的问题，提出并讨论了异种数据库互操作的概念、特点及其实现的机制与途径，并结合数据库的最新发展技术提出了基于客户机／服务器的体系结构及其原型系统的实现。

异构分布环境下的远程协作系统(HD-RCS)

分布环境下的应用处理与资源共享将面临不同层次的异构性（包括：数据库层，操作系统层和网络层），为此我们提出了一种基于客户／服务器结构的远程协作系统，该系统是建立在数据库远程过程调用（ＤＢＲＰＣ）的机制之上的，其特点是通过其底层的抽象通信平台（Ｓｔｅｐｇａｔｅ）能实现与各种网络协议的互联。同时也能支持其上层应用系统对各种远程资源（数据资源、操作处理资源等）实现同步或异步远程访问与操作。进而支持异构分布环境下的资源共享与分布处理。

CIMS环境下信息集成平台──系统使能器技术的研究与应用

本文阐述了ＣＩＭＳ环境下信息集成平台中基于开放式客户／服务器结构的系统使能器技术的地位、功能及其在ＣＩＭＳ环境下的实现结构，并结合ＣＩＭＳ的具体应用工厂ＳＢＣＩＭＳ讨论了ＣＩＭＳ环境下基于系统使能器技术的信息集成结构。

远程数据库访问系统客户／服务器体系结构模型的设计与实现

远程数据库访问（ＲＤＡ）是ＯＳＩ应用层一个特别应用服务元素（ＳＡＳＥ），是数据库基础标准，是构造分布数据库开放式体系结构的基础．本文遵照国际标准ＲＤＡ模型、服务、协议，研究并给出实现ＲＤＡ客户／服务器体系结构模型、方法与系统原型。

基于OS／2的客户／服务器体系结构

本文阐述了客户／服务器计算的特点，介绍了ＯＳ／２２·１操作系统为客户／服务器计算模式所提供的各类支持。最后，就以ＯＳ／２为操作系统构建客户／服务器结构的可能模式进行了分析与讨论。

客户／服务器环境下的OS／22·1操作系统

ＯＳ／２２·１是当今客户／服务器计算模式的首选操作系统之一。本文对ＩＢＭＯＳ／２２·１操作系统所具备的，对客户／服务器计算模式的各种支持功能作了详细的介绍。

CIMS环境下的使能器技术及其应用

本文阐述了ＣＩＭＳ中异构分布式数据库环境下基于并行客户／服务器结构的使能器技术、功能及其结构。并讨论了使能器技术在ＣＩＭＳ环境下的应用研究。

120通信指挥系统的呼救处理子系统程序设计

随着计算机技术的发展与国民生活水平的提高，计算机管理与通信技术已被广泛应用于国民生活的各个角落。社会公共服务部门原有的管理体制与运作手段已不再适应社会发展的需要，如何改造旧体制及将新的技术应用到了人民群众的日常生活中成为计算机应用研究员的一个主要课题。120急救部门是社会基础设施的重要组成部分，直接关系到人民的健康与生命，所以实现急救部门的灵活与高效具有重要的现实意义。“120通信指挥系统”的总体目标就是实施急救工作的全程实时控制和信息处理，为指挥与抢救工作提供服务。本文以“120通信指挥系统”为背景，探讨并运用了科学的软件工程技术，力求以最优方法实现呼救处理子系统，辅助急救调度工作的有效实施。呼救处理子系统的主要用途是完成接警、调度以及用急救任务的下达。在整个处理过程中应用地理信息系统提供数字地图，并与后台数据库进行数据交互。论文中采用了第四代编程语言VB能及Client/Server技术实现接警高度过程的计算机化，并在接警过程中应用专家系统技术提供简单的病情诊断为急救工作人员的指挥调度提供依据。系统的开发为计算机技术在社会公共服务部门的应用提供了一条新思路。

Timeliness via Speculation for Real-Time Databases

Various concurrency control algorithms differ in the time when conflicts are detected, and in the way they are resolved. In that respect, the Pessimistic and Optimistic Concurrency Control (PCC and OCC) alternatives represent two extremes. PCC locking protocols detect conflicts as soon as they occur and resolve them using blocking. OCC protocols detect conflicts at transaction commit time and resolve them using rollbacks (restarts). For real-time databases, blockages and rollbacks are hazards that increase the likelihood of transactions missing their deadlines. We propose a Speculative Concurrency Control (SCC) technique that minimizes the impact of blockages and rollbacks. SCC relies on the use of added system resources to speculate on potential serialization orders and to ensure that if such serialization orders materialize, the hazards of blockages and roll-backs are minimized. We present a number of SCC-based algorithms that differ in the level of speculation they introduce, and the amount of system resources (mainly memory) they require. We show the performance gains (in terms of number of satisfied timing constraints) to be expected when a representative SCC algorithm (SCC-2S) is adopted.

Basis Token Consistency: A Practical Mechanism for Strong Web Cache Consistency

With web caching and cache-related services like CDNs and edge services playing an increasingly significant role in the modern internet, the problem of the weak consistency and coherence provisions in current web protocols is becoming increasingly significant and drawing the attention of the standards community [LCD01]. Toward this end, we present definitions of consistency and coherence for web-like environments, that is, distributed client-server information systems where the semantics of interactions with resource are more general than the read/write operations found in memory hierarchies and distributed file systems. We then present a brief review of proposed mechanisms which strengthen the consistency of caches in the web, focusing upon their conceptual contributions and their weaknesses in real-world practice. These insights motivate a new mechanism, which we call "Basis Token Consistency" or BTC; when implemented at the server, this mechanism allows any client (independent of the presence and conformity of any intermediaries) to maintain a self-consistent view of the server's state. This is accomplished by annotating responses with additional per-resource application information which allows client caches to recognize the obsolescence of currently cached entities and identify responses from other caches which are already stale in light of what has already been seen. The mechanism requires no deviation from the existing client-server communication model, and does not require servers to maintain any additional per-client state. We discuss how our mechanism could be integrated into a fragment-assembling Content Management System (CMS), and present a simulation-driven performance comparison between the BTC algorithm and the use of the Time-To-Live (TTL) heuristic.

Application of Internet techniques into online collaborative design and manufacture

A research project in Web-enabled collaborative design and manufacture has been conducted. The major tasks of the project include the development of a Web-enabled environment for collaboration, online collaborative CAD/CAM, remote execution of large size programs (RELSP), and distributed product design. The tasks and Web/Internet techniques involved are presented first, followed by detail description of two approaches developed for implementation of the research: (1) a client-server approach for RELSP, where the following Internet techniques are utilized: CORBA, Microsoft’s Internet information server, Tomcat server, JDBC and ODBC; (2) Web-Services supported collaborative CAD which enables geographically dispersed designers jointly conduct a design task in the way of speaking and seeing each other and instantaneously modifying the CAD drawing online.

Mobile Wearable Communications

This special issue provides the latest research and development on wireless mobile wearable communications. According to a report by Juniper Research, the market value of connected wearable devices is expected to reach $1.5 billion by 2014, and the shipment of wearable devices may reach 70 million by 2017. Good examples of wearable devices are the prominent Google Glass and Microsoft HoloLens. As wearable technology is rapidly penetrating our daily life, mobile wearable communication is becoming a new communication paradigm. Mobile wearable device communications create new challenges compared to ordinary sensor networks and short-range communication. In mobile wearable communications, devices communicate with each other in a peer-to-peer fashion or client-server fashion and also communicate with aggregation points (e.g., smartphones, tablets, and gateway nodes). Wearable devices are expected to integrate multiple radio technologies for various applications' needs with small power consumption and low transmission delays. These devices can hence collect, interpret, transmit, and exchange data among supporting components, other wearable devices, and the Internet. Such data are not limited to people's personal biomedical information but also include human-centric social and contextual data. The success of mobile wearable technology depends on communication and networking architectures that support efficient and secure end-to-end information flows. A key design consideration of future wearable devices is the ability to ubiquitously connect to smartphones or the Internet with very low energy consumption. Radio propagation and, accordingly, channel models are also different from those in other existing wireless technologies. A huge number of connected wearable devices require novel big data processing algorithms, efficient storage solutions, cloud-assisted infrastructures, and spectrum-efficient communications technologies.

Aprendizagem baseada em projetos na consolidação de conceitos de programação de linguagens SCRIPT

Relatório da prática de ensino supervisionada, Mestrado em Ensino de Informática, Universidade de Lisboa, 2014

An internet DGPS service for precise outdoor navigation

The goal of the work presented in this paper is to provide mobile platforms within our campus with a GPS based data service capable of supporting precise outdoor navigation. This can be achieved by providing campus-wide access to real time Differential GPS (DGPS) data. As a result, we designed and implemented a three-tier distributed system that provides Internet data links between remote DGPS sources and the campus and a campus-wide DGPS data dissemination service. The Internet data link service is a two-tier client/server where the server-side is connected to the DGPS station and the client-side is located at the campus. The campus-wide DGPS data provider disseminates the DGPS data received at the campus via the campus Intranet and via a wireless data link. The wireless broadcast is intended for portable receivers equipped with a DGPS wireless interface and the Intranet link is provided for receivers with a DGPS serial interface. The application is expected to provide adequate support for accurate outdoor campus navigation tasks.