通信电源的管理及其维护

本文介绍了通信电源系统的组成和特点,强调了对通信电源加强维护管理的重要性。并介绍了对蓄电池的维护和对通信设备的防雷措施方法,以及通信电源和通信设备的接地系统。     

嵌入式系统电源管理架构分析与设计

本文以常见嵌入式的电源管理功能为基础,分析了几种有代表性的嵌入式操作系统电源管理的实现方式,探讨针对嵌入式设备电源管理系统软件现状及研究应用前景,并对目前流行的嵌入式平台的智能电源管理软硬件发展趋势进行了预测.     

基于S3C6410的嵌入式系统休眠与唤醒策略设计与实现

系统休眠与唤醒作为电源管理的关键技术之一,实现了处理器功耗模式的切换和设备电源管理的间接管理。根据S3C6410处理器模块的特性和Windows Embedded CE 6.0电源管理驱动结构,研究并实现了嵌入式系统休眠与唤醒;同时,还对唤醒源设置这样的关键问题进行了研究,最后对该休眠与唤醒策略进行了功能验证和性能分析。实验结果表明,本设计具有良好的稳定性和有效性。通过对休眠唤醒在系统的电源管理过程中发挥的作用进行了定量分析,不失一般性,本设计可为其他嵌入式系统功耗控制提供参考解决方案。     

APC与CISCO携手管电

APC公司宣布与Cisco系统公司合作,通过网络增强对电源保护设备和相关Internet设备进行远程管理。通过集成了APC的电源管理软件的CiscoWoks2000,Cisco的用户可以使用任何一个Web浏览器方便的管理APC电源保护设备和网络电源控制设备。这是APC在一周之内所作出的第二个声明。APC是电源保护和管理设备的制造商,它首先引入了网络管理和网络电源配置的工具。它已经公开了     

发挥现代通信电源效能的维护管理方法

文章主要阐述了在通信电源的维护管理中,要突破传统的维护管理方法和思路。充分发挥现代通信电源设备在通信生产中的作用和潜在效能,扩大现代通信电源的功能,用节能增效的理念去维护管理通信电源。进而探索开拓维护管理方法,以适应创建节约型社会的目标。     

WINCE下中的电源初始化方法

较详细地阐述了如何在WINCE 5.0系统下通过MC13783芯片的电源管理功能实现电源分配的初始化工作,并从工程开发的角度介绍了如何在系统初始化过程中加载电源管理的一种方法.电源管理初始化实现方案的重点在于通过初始化WINCE系统对系统的电源管理进行加裁,从而实现对一整套完整的移动终端设备进行电源管理.     

嵌入式设备的智能化电源管理系统

在分析传统嵌入式系统电源管理的基础上,主要从策略角度分析传统电源管理存在的弊端,提出智能化电源系统应具备的特点,并提出一套嵌入式设备智能化电源管理系统的完整方案。实践验证了此方案的高效性能。     

ARM Linux内核中实现电源管理的方法

随着全球信息化的迅猛发展,以个人信息处理为主要应用目标的各种掌上设备成为了市场的新焦点,出现了一大批功能强大的嵌入式信息处理设备,受到了广大用户的青睐。一台成功的掌上信息处理设备不仅要求体积小巧,功能强大,而且其待机时间也应达到一定的标准,因此掌上设备的电源管理就成为很重要的一个部分内容。笔者在G P L 许可协议下,利用开源组织提供的项目源码,在已成功运行了 Linux[1]的 Intel　DBPXA250　Lub-bock 实验开发板上对电源管理做了探索,并实现了简单的电源管理功能。1 硬件与软件系统概述 系统的硬件平台采用 Intel的 …     

浅谈关于网络信息中心主机房电源系统改造

从安全方面考虑,UPS 电源与网络、服务器设备分开,有利于服务器设备的维护和电源设备的监控以及日常的维护工作.另外主机房在架设配电柜时,将 UPS 电源与市电充分考虑进去,在市电正常情况下,能对 UPS电源进行充电,并通过 UPS 电源对电流进行过滤,起到稳压的作用,从而避免了主机房内的网络、服务器设备因为电流不稳定而造成损伤.另外,要求对负载供电不间断而对 UPS 内部进行维修时,使用维修旁路开关.提高其安全性、可靠性、稳定性,才能保证网络设备及服务器的正常运行.     

Pocket PC 2005电源管理及其信息获取

Windows CE从4．0版开始引入了独立的电源管理组件,取代了传统的GWES的电源管理功能。介绍PocketPC2005电源管理原理与框架、系统电源状态与设备电源状态的概念及映射关系．用C#代码给出了获取电源信息的实例。     

Real‐Time Concurrent Linked List Construction on the GPU

We introduce a method to dynamically construct highly concurrent linked lists on modern graphics processors. Once constructed, these data structures can be used to implement a host of algorithms useful in creating complex rendering effects in real time. We present a straightforward way to create these linked lists using generic atomic operations available in APIs such as OpenGL 4.0 and DirectX 11. We also describe several possible applications of our algorithm. One example uses per‐pixel linked lists for order‐independent transparency; as a consequence, we are able to directly implement fully programmable blending, which frees developers from the restrictions imposed by current graphics APIs. The second uses linked lists to implement real‐time indirect shadows.     

基于用户反馈的API推荐工具

在软件开发的过程中,开发人员经常会检索合适的API来完成编程任务.为了提高软件开发效率,大量API推荐方法及工具应运而生.然而,这些方法大多数都没有考虑用户交互信息.本文提出了一个基于客户端/服务器架构的API推荐工具,将其以插件的形式集成到VS Code IDE中.本工具使用现有的API推荐工具生成初始API推荐列表,结合用户反馈信息,利用排序学习和主动学习技术对API推荐列表进行重新排序,实现了用户个性化推荐.大量实验证明,随着反馈数据量的增加,本工具的性能稳步提升.     

On The Roles of APIs in the Coordination of Collaborative Software Development

The principle of information hiding has been very influential in software engineering since its inception in 1972. This principle prescribes that software modules hide implementation details from other modules in order to reduce their dependencies. This separation also decreases the dependency among software developers implementing these modules, thus simplifying the required coordination. A common instantiation of this principle widely used in the industry is in the form of application programming interfaces (APIs). While previous studies report on the general use and benefits of APIs, they have glossed over the detailed ways in which APIs facilitate the coordination of work. In order to unveil these mechanisms, we performed a qualitative study on how practitioners use APIs in their daily work. Using ethnographic data from two different software development teams, we identified three roles played by APIs in the coordination of software development projects. These roles are described using three metaphors: APIs as contracts, APIs as boundaries, and APIs as communication mechanisms. As contracts, APIs allow software developers to work in parallel and independently. As a communication mechanism, APIs facilitate communication among software developers by giving them something specific to talk about. At the same time, APIs establish the boundaries between developers, and, accordingly, what should be talked about. This paper also reports on problems the studied teams face when using APIs to coordinate their work. Based on these results, we draw theoretical implications for collaborative software engineering.     

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     

一种基于Android的防火墙的研究与实现

Android作为2007年底刚刚发布的全新的开源手机操作系统,由于其开源性与强大的应用层API,使得其在短时间内拥有很多用户。当今手机通过各种网络上网已经非常普及,而Android网络安全问题也随之而来。但是也由于Android的API的限制,使得很多涉及底层的工作无法仅仅依靠API实现。因此讨论了一种利用JNI技术直接与底层模块交互的组件开发方式和规则冲突检测的新算法。最后实现了在Android环境下的包过滤防火墙AndFirewal。     

基于AI Planning的Parlay X电信业务设计

Parlay X是一组电信网络服务(WS)应用程序接口(APIs),智能规划可作为一种WS组合(WSC)方法,所以理论上可基于智能规划设计使用Parlay X APIs的电信业务.但WSC有容错和对动作变化推理的要求,电信业务有多种触发方式和异步响应等特性,智能规划要有确定状态等Parlay X不满足的条件.结合典型P...     

Android系统应用程序组件安全性分析

针对当前Android系统第三方应用程序组件中普遍存在的各种安全问题,分析了引起这种问题的原因。提出了一种基于静态分析Android应用程序中四种组件的属性信息和Java系统服务中的敏感API（Application Programming Interface）调用信息,通过构建Android应用程序的函数调用关系图,检测组件入口函数和和敏感API之间可能存在的不安全的静态可执行路径。该方案主要利用反编译、XML（extensible markup language）文件解析和正则表达式匹配技术以获取应用程序的组件和敏感API的调用信息。实验结果表明了该方案的可行性和有效性。     

Iterative adaptation for mobile clients using existing APIs

Iterative adaptation is a novel approach to adaptation for resource-limited mobile and wireless environments that supports powerful application-specific adaptations without requiring modifications to the application's source code. Common productivity applications, such as browsers, word processors, and presentation tools, export APIs that allow external applications to control their operation. The novel premise in iterative adaptation is that these APIs are sufficient to support a wide range of adaptation policies for applications running on resource-limited devices. In addition to allowing adaptation without having to change the application's source code, this approach has a unique combination of advantages. First, it supports centralized management of resources across multiple applications. Second, it makes it possible to modify application behavior after the application has been deployed. This paper evaluates the extent to which existing APIs can be used for the purposes of adapting document-based applications to run on bandwidth-limited devices. In particular, we implement a large number of bandwidth adaptations for applications from the Microsoft Office and the OpenOffice productivity suites and for Internet Explorer. Although we find limitations in their APIs, we are able to implement many adaptation policies without much complexity and with good performance. Moreover, iterative adaptation achieves performance similar to an approach that implements adaptation by modifying the application, while requiring only a fraction of the coding effort.     

基于 REST 风格的科学计算环境 Web服务 API

基于 Web 页面的计算门户提供了简单易用的用户使用界面,这些门户需要访问异构的计算机群。本文研究和实现基于 REST 风格的科学计算环境 Web 服务 API (SCEAPI-REST),其核心思想是充分利用 Web 服务在复杂系统中的集成优势以及 REST 风格的 API 跨平台和跨编程语言的特性,为开发者提供简单易用的计算机群开发接口,包括用户管理、资源查询、作业管理和文件传输等功能。基于 SCEAPI-REST,开发人员不再需要解决机群访问的繁杂问题,只需要专心构建面向科学计算的终端软件。该 API 已经应用到计算化学、材料科学、生物信息等多个领域的专业社区和工具软件。     

What are the characteristics of popular APIs? A large-scale study on Java,Android, and 165 libraries

Software systems are commonly implemented with the support of libraries, which provide features via APIs. Ideally, APIs should have some characteristics, for example, they should be well documented and stable so that client systems can confidently rely on them. However, not all APIs are equal in number of clients: while some APIs are very popular and used worldwide, other may face much lower usage rates. In this context, one question appears: are there particular characteristics that differentiate popular APIs from ordinary APIs? Answering this question can uncover how worldwide APIs are actually implemented and maintained, revealing practices to better support both research and development on APIs. In this paper, we assess the characteristics of popular APIs, including their size, legibility, documentation, stability, and client adoption. We analyze 1491 APIs provided by Java, Android, and 165 libraries. We detect that popular APIs are distinct from ordinary ones, for example, often, popular APIs are larger, have more comments, and are more unstable than ordinary APIs. Finally, we provide a set of lessons learned from the popular APIs on factors that developers can control, such as the exposure of public methods and the API stability.