共查询到19条相似文献,搜索用时 109 毫秒
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ISO/IEC 24756定义了一个通用访问框架,可借助辅助技术帮助用户克服计算系统使用环境存在的各种障碍,方便地访问软件应用系统.该标准可用于评价现存应用系统的可访问性. 相似文献
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论述了在Windows 98/2000操作系统下如何实现MS-DOS应用程序对硬件设备的访问。详细分析了在Windows 98中的VxD技术及工作原理,在Windows 2000中的VDD技术及工作原理,以及如何利用VxD和VDD技术完成对硬件设备端口的访问。 相似文献
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采用无状态翻译技术和双重翻译/封装技术IVI/MAP-T/MAP-E定义IPv4/IPv6地址的映射算法和协议翻译/封装算法,在保持互联网地址端对端的特性的基础上,使IPv4和IPv6互联互通,支持由IPv4和IPv6双向发起的访问.无状态翻译技术和双重翻译/封装技术有着不可替代的综合优势,是IPv4/IPv6过渡的必经之路. 相似文献
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赵菁华 《信息技术与标准化》2013,(10):29-30
8月26~31日,ISO/IECJTC1/SC35(用户界面技术分委员会)2013年年会在加拿大萨斯卡通召开。来自中国、加拿大、英国等九个国家的28名代表出席了本次会议。本次会议主要围绕计算机用户界面标准化工作展开,即制定在信息和通信技术(ICT)环境中的用户系统接口规范以及在优先满足JTC1文化语言适应性需求的基础上对所有用户提供服务接口支持,包括残疾或者其他特殊需求的人。会议内容具体涵盖以下七个方面:(1)用户接口的可访问性(要求、需求、方法、 相似文献
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本血液检测系统成功实现了系统数据的采集、批量数据存储、医学算法嵌入、人机交互、上下位机通信等各个模块,融入操作系统μC/OS-Ⅱ对模块和设备进行任务管理,协调各设备之间数据的通信和资源的有序访问。血检系统主板软件结构由简单到复杂、由层次到模块的形式来搭建骨架,依托μC/OS-Ⅱ操作系统邮箱队列机制,创造高低速数据访问模型的可容性,构建数据和软件源码的可穿插访问,最大效率地完成了系统需求。 相似文献
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基于B/S结构的Windows95远程实时数据访问 总被引:2,自引:0,他引:2
根据工业环境的特点,对远程实时数据访问的方案进行了分析.结合当前技术条件,介绍了如何在纯Windows95环境下不编程通过调制解调器和公共电话网实现浏览/服务模式的远程数据访问. 相似文献
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32位操作系统的保护机制限制了用户态应用程序对端口的直接访问。文章讨论了I/O管理器的结构、内核态设备驱动程序模型及实现原理。在屏蔽位矩阵IOPM硬件保护技术的基础上,重点分析了基于WDM驱动程序对I/O端口的访问方法,并给出了程序实例。实际应用表明,此方法具有较强的I/O端口管理能力。 相似文献
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论述了信息无障碍领域标准制定方面有代表性的标准化机构研究方向和侧重点,ISO/IEC JTC1侧重在整体性、全局性的考虑,ITU-T集中在通信技术的无障碍研究规范上,W3C更侧重于网页无障碍的具体技术指标。 相似文献
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《Solid-State Circuits, IEEE Journal of》1986,21(5):649-654
High-speed operation, a 33-MHz serial cycle, and a 10-ns serial data access time have been realized by internal serial/parallel conversion circuits, a newly designed I/O controller circuit, new dynamic register circuits, a divided sensing method, and an optimized layout design. The chip is fabricated with a 1.2-/spl mu/m double-level polysilicon and double-level aluminium n-channel MOS process technology. An optimized interlevel insulator realizes equivalent first- and second-level aluminium pitches for a compact chip design. The chip size is 5.88/spl times/11.2 mm/SUP 2/. This memory has high-speed input and output capability as well as random accessibility. These features are suitable for TV and VCR frame-memory-system applications. 相似文献
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Internet传真业务的现状及发展趋势 总被引:1,自引:0,他引:1
随着Internet的发展和传真技术的成熟,将Internet的广泛通达性和低价格带来到传真通信上已成为人们倍加关注的问题。本文就国际上有关Internet传真业务的试验,应用,标准化进展情况及发展趋势等方面的内容作了一番探讨。 相似文献
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This study investigates random accessibility and efficiency enhancements in highly scalable video and volumetric compression. With the advent of interactive multimedia technology, random accessibility has emerged as an increasingly important consideration in the design and optimization process. In this paper, we assess the impact that the transform, embedded coding components, and code-block configurations have on the compression efficiency and accessibility of a scalable codestream. We develop performance bounds on techniques which exploit temporal redundancy within the confines of a feed-forward compression system. We also examine their random access properties to argue the significance of motion-adaptive subband transforms. When information-theoretic measures are used to determine the potential benefits of three-dimensional (3-D) context coding, we find that most of the coding gain is attributed to code-block extension, rather than interslice context modeling itself. To gain further insight into the tradeoffs that the coding part has to offer, we run a series of simulations to determine code-block partitioning strategies which maximize reconstruction quality and space-time localization. The LIMAT framework and EBCOT coding paradigm have laid a solid foundation for further progress in the development of highly scalable 3-D compression systems. 相似文献
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介绍了ISO/IEC JTC1/SC35用户界面分技术委员会的标准化领域,阐述了文化和语言适应性、信息无障碍、用户接口、键盘布局等方面的标准,最后分析了该分技术委员会的下一步发展重点。 相似文献
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Saeed Mutaz Elradi S. Liu Qingyin Tian GuiYun Gao Bin Li Fagen 《Wireless Networks》2018,24(8):3141-3160
Wireless Networks - In order to improve the accessibility of the services provided by a sensor network, wireless sensor networks (WSNs) is integrated to Internet of Things (IoTs). In this case, the... 相似文献
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The object of this paper is to define the third way to telecommunication development-suitable to the needs and conditions of the third world countries. It begins with some comments on the present conditions, identifies probable reasons, and defines three fundamental goals for developing nations: 1) rural communication,2) accessibility, and 3) reliability. Based on these three goals, the third way to telecommunication development is defined. The need for an autonomous telecommunication technology center for the third world is emphasized, and its objectives, organization, and implementation are discussed. A need for new systems geared toward increasing accessibility is advocated. As an example, a new concept called the "community telephone" is introduced, which is designed to provide reliable telecommunication service to a small community. At the end, it is concluded that the real implication of the third way to telecommunication development can only be analyzed through further interdisciplinary research. 相似文献