L61 计算机的设计和质量评价 标准查询与下载

GB/T 43437-2023 信息技术 信息产品研发能力评估模型

Information technology information product R&D capability assessment model

BS EN 62665:2016 多媒体系统和设备. 多媒体电子出版和电子书技术. 印刷文本的听觉表象用材质贴图

Multimedia systems and equipment. Multimedia e-publishing and e-books technologies. Texture map for auditory presentation of printed texts

ITU-T P.834.1-2015 从宽带语音编解码器的仪器设备减值因素模型的推导方法的延伸(研究组12)

Recommendation ITU-T P.834.1 describes an extension of the methodology for deriving equipment impairment factors from instrumental models of Recommendation ITU-T P.834.It is intended that it be primarily applied to determine wideband equipment impairment factors Ie,wb,capturing the degradation introduced by wideband speech codecs.The resulting wideband equipment impairment factors derived by this methodology are intended to be used on the extended transmission rating scale underlying the E-model (see Appendix II of Recommendation ITU-T G.107).They reflect the auditory impairments of the corresponding equipment in a listening-only mode.The methodology of Recommendation ITU-T P.834.1makes use of instrumental models (so called "objective methods"),e.g.,the model defined in Recommendation ITU-T P.862.2.It is to be considered as supplementary to the methodology based on auditory listening-only tests,described in Recommendation ITU-T P.833.1.It provides valid Ie,wb values only for those codecs for which the instrumental model used produces meaningful estimations. Speech material associated with Recommendation ITU-T P.834.1 is freely available on the test signal database at www.itu.int/net/ITU-T/sigdb.

Extension of the methodology for the derivation of equipment impairment factors from instrumental models for wideband speech codecs (Study Group 12)

KS X ISO/IEC 15411:2014 信息技术.分割键盘排列

Information technology－Segmented keyboard layouts

BS EN 62481-3:2014 数字生活网络联盟 (DLNA) 家用网络化设备互用性指南. 链路保护

Digital living network alliance (DLNA) home networked device interoperability guidelines. Link protection

BS EN 62481-2:2014 数字生活网络联盟 (DLNA) 家用网络化设备互用性指南. DLNA媒体格式

Digital living network alliance (DLNA) home networked device interoperability guidelines. DLNA media formats

ITU-T Y.1541 AMD 1-2013 基于IP的服务修改件1网络性能目标;新附录XII:低速接入网络的考虑(研究组12)

Amendment 1 to Recommendation ITU-T Y.1541 (2011) introduces Appendix XII.

Network performance objectives for IP-based services Amendment 1: New Appendix XII – Considerations for low speed access networks (Study Group 12)

BS EN 62665:2012 多媒体系统和设备. 多媒体电子出版和电子书技术. 印刷文本的听觉表象用材质贴图

Multimedia systems and equipment. Multimedia e-publishing and e-book technologies. Texture map for auditory presentation of printed texts

KS X ISO/IEC 15411:2011 信息技术.分割键盘排列

? ??? ??? ???? ??? ??? ??? ? ???? ????? ?? ????. ?

Information technology-Segmented keyboard layouts

ITU-T Y.2058-2011 从下一代网络运营商的角度看网际网路通讯协定第六版的迁移路线图

Recommendation ITU-T Y.2058 specifies multiple phases for next generation network (NGN) operators to migrate from an Internet protocol version 4 (IPv4)-based NGN to an Internet protocol version 6 (IPv6)-based NGN. The migration includes five phases from a pure IPv4-based NGN to a pure IPv6-based NGN. General functional requirements of migration are given as are specific functional requirements for each phase.

Roadmap for IPv6 migration from the perspective of the operators of next generation networks (Study Group 13)

ANSI/IEEE 1680.1:2010 个人电脑产品的环境评定标准(包括笔记本型个人电脑、桌上个人电脑和个人电脑显示器)

This Standard defines environmental performance criteria for personal computer products, including desktop computers, notebook computers, and computer displays.

Standard for Environmental Assessment of Personal Computer Products, Including Notebook Personal Computers, Desktop Personal Computers, and Personal Computer Displays

ITU-T Y.2701-2007 (预发布)NGN 版本1的安全要求

This Recommendation provides security requirements for Next Generation Networks (NGNs) against security threats. It is achieved by applying the principles of ITU-T Rec. X.805, Security architecture for systems providing end-to-end communications to ITU-T

Security requirements for NGN release 1 Study Group 13

ITU-T Y.2171-2006 NGN中的管理控制优先权等级 第13研究组

This Recommendation proposes three levels for admission control priority for services seeking entry into Next Generation Networks. The admission control priority indicator is intended as a guidance in the development of appropriate signalling protocol ex

Admission control priority levels in Next Generation Networks Study Group 13

ITU-T Y.1541 AMD 1-2006 基于IP业务的网络性能目标 第12研究组

This appendix provides an example on how to calculate IPDV when a number of network sections are involved. It builds on the information contained in 8.2.4/Y.1541 and also provides some background information on the method.

Network performance objectives for IP-based services Amendment 1: New Appendix X ?An example showing how to calculate IPDV across multiple sections Study Group 12

JEDEC JESD79-2C-2006 DDR2 SDRAA 规范要求

Read and write accesses to the DDR2 SDRAM are burst oriented; accesses start at a selected location and continue for a burst length of four or eight in a programmed sequence. Accesses begin with the registration of an Active command, which is then followed by a Read or Write command. The address bits registered coincident with the active command are used to select the bank and row to be accessed (BA0-BA2 select the bank; A0-A15 select the row). The address bits registered coincident with the Read or Write command are used to select the starting column location for the burst access and to determine if the auto precharge command is to be issued. Prior to normal operation, the DDR2 SDRAM must be initialized. The following sections provide detailed information covering device initialization, register definition, command descriptions and device operation.

DDR2 SDRAM SPECIFICATION

ITU-T G.723.1-2006 (预先出版)符合ITU-T G.723.1建议的5.3kbit/s和6.3kbit/s双速率语音编解

This Recommendation specifies a coded representation that can be used for compressing the speech or other audio signal component of multimedia services at a very low bit rate. In the design of this coder, the principal application considered was very low

Dual rate speech coder for multimedia communications transmitting at 5.3 and 6.3 kbit/s Study Group 16

ITU-T Y.1541-2006 基于IP业务的网络性能目标 第12研究组

In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.

Network performance objectives for IP-based services (Study Group 12)

ANSI/ASTM E1340:2005 信息系统的快速样机指南

This guide covers a rapid prototyping method for developing information systems that is particularly relevant to systems for the healthcare sector. Intended readers of this guide are people who develop information systems, and students and teachers of system development methods. Rapid prototyping is an approach to developing information systems which produce a working model more quickly than conventional approaches. Where conventional methods concentrate on preparing Requirements and design documents that describe the needed system, rapid prototyping methods concentrate on preparing a working prototype. Users and developers learn the functional requirements and an appropriate system design by interacting with a series of prototypes, each of which is rapidly produced from a starting framework or from an earlier version. A prototype can evolve into an operational system, it can serve as an exact behavioral specification of an operational system, or it can be used to explore the feasibility of a new idea or design which can be incorporated in a larger system. The method is rapid in preparing each version of the prototype, but the overall time required for system development may be more or less than the time required with conventional methods. Rapid prototyping is most appropriate when the Requirements or design for a system are not well understood, or when experimentation is required to explore some aspect of system behavior. It is not appropriate in hazardous settings, or when the requirements are well understood. The guide recommends use of prototyping tools, but it is not a standard for the tools themselves. It does not cover executable specification tools. Transforming a prototype that is used to clarify Requirements into an operational system is discussed briefly in Section 8 and in detail in other referenced standards . This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Guide for Rapid Prototyping of Information Systems

ITU-T Y.1713-2004 MPLS网络的分路丢失检测 系列Y 第13研究组

This Recommendation provides mechanisms for user-plane OAM (Operation and Maintenance) functionality in MPLS networks according to the requirements and principles given in ITU-T Rec. Y.1710. The current version of this Recommendation is designed primarily

Misbranching detection for MPLS networks Study Group 13

ITU-T Z.100 ANNEX C-2003 (预发布)CCITT规范和描述语言(SDL)附件C 系列Z

This prepublication is an unedited version of a recently approved Recommendation. It will be replaced by the published version after editing. Therefore, there will be differences between this prepublication and the published version.

Pre-Published) Specification and Description Language (SDL) Annex C: Compliance to this Recommendation SERIES Z: LANGUAGES AND GENERAL SOFTWARE ASPECTS FOR TELECOMMUNICATION SYSTEMS Formal description techniques (FDT) ?Specification and Description Langu