Certification of reference materials and accreditation of reference material producers: Questionable terminology leads to confusion

In the view of the Deutscher Kalibrierdienst (DKD) , a certifying body for reference materials can be considered to be a calibration laboratory. Therefore, accreditation of calibration laboratories in accordance with ISO/IEC 17025 is the most appropriate way to establish confidence in certificates for reference materials. If necessary, the criteria of ISO/IEC 17025 can be tailored to specific cases. There is no need to provide any new kind of reference-material specific accreditation. However, in view of the variety of reference materials and the practice existing in other countries, accreditation of testing laboratories and product certification bodies may optionally be acceptable as long as the same stringent principles with respect to traceability and measurement uncertainty are applied. Such accreditations but not accreditations of reference material producers (ISO Guide 34) are also covered by existing international mutual recognition arrangements (MRA).     

Accreditation of reference material producers: the example of IRMM's Reference Materials Unit

The potential approaches for third-party assessment of reference material producers are revisited and the activities of the Reference Materials (RM) Unit of the Institute for Reference Materials and Measurements (IRMM) to obtain accreditation to ISO Guide 34 and ISO 17025 are described. Accreditation was related to the Unit as all matrix RM activities of the institute are concentrated there. A management system was established that allows sufficient flexibility to be applicable to a wide range of RMs while being precise enough to ensure compliance with ISO Guides 30, 31 and especially 34 and 35. Accreditation was achieved in 2004 with independent scopes for testing and RM production and was confirmed and extended in 2005. The key aspects of the RM Unit's management system for RM production are presented. Presented at BERM-10, April 2006, Charleston, SC, USA     

Application of the ISO 13472-1 in situ technique for measuring the acoustic absorption coefficient of grass and artificial turf surfaces

This paper presents the applicability of an in situ technique based on ISO 13472-1 standard for measuring the acoustic absorption coefficient of grass and artificial turf surfaces for normal incidence from a sound source. The in situ method is based on acoustic impulse response measurement of the material surface. A maximum length sequence (MLS) signal is played through a loudspeaker and the acoustic response from the surface is recorded using a single microphone. The fast Hadamard transform and fast Fourier transform based digital signal post-processing algorithm provides the acoustic absorption coefficient of the surface under test. The normal incidence acoustic absorption coefficient of a commercial artificial quash surface of Dow Co. obtained from this method was compared with the results from the ASTM E1050 impedance tube method for the same surface. The acoustic absorption coefficients of a test-site grass surfaces were measured for 30 mm and 100 mm length of grass blades in wet and dry soil conditions. Substantial difference in the acoustic absorption coefficient was observed for a similar grass-like artificial surface used for estimating sound power of commercial garden equipments and lawnmowers. The advantage of the in situ method lies in its ability to measure the normal incident acoustic absorption coefficient of any planar surface as installed or in situ. Additionally a quick testing time of less than a minute with the use of a laptop sound card based inexpensive data acquisition system is the main feature of this robust method.     

无源UHFRFID标签芯片基带处理器的低功耗设计

在分析ISO18000-6C标准内容的基础上,提出了一种基带处理器的结构,设计了一款符合ISO18000-6C标准的UHF RFID标签芯片的基带处理器。该基带处理器可支持协议规定的所有强制命令。设计通过降低工作电压、降低工作频率、使用门控时钟、增加功耗管理模块等一系列低功耗设计以降低处理器的功率消耗。在Xillinx的Virtex-4FPGA上验证满足协议功能要求,并在工作电压为1V,时钟为1.92MHz时,功耗仿真结果为9.9μW,很好的完成了低功耗电子标签的基带处理器设计。     

基于FPGA的RFID板级标签设计与实现

在分析射频识别原理和特点的基础上,讨论超高频射频识别系统中电子标签设计技术,并采用EP1C6Q240FPGA对超高频电子标签进行了板级设计及其实现.利用Verilog语言实现了标签数字电路,并在板级标签中进行了验证.测试结果表明,该设计实现了ISO18000-6C标准的标签读写功能,读写性能优异,为下一步设计出符合该标准的电子标签芯片提供了有力保证.     

IT服务管理(ITSM)支撑平台设计与实现

提出了一种新的ITSM支撑平台的设计方法,该方法便于实现ITIL中的事件管理、问题管理、变更管理、发布管理、配置管理、业务连续性管理等等,从而为公司和企业的IT服务管理规范化、标准化、流程化奠定基础。     

ERP与ISO9000质量管理体系

本文介绍了ERP的起源和一些基本概念,从管理思想角度入手,比较了ERP和ISO9000质量管理体系的异同,分析了两者的联系以及结合的可能性.认为以ISO9000的理论为基础,结合ERP生产管理思想,再利用ERP软件这一先进的工具,可为企业创造更高的效益.     

An Analog Front‐End Circuit for ISO/IEC 14443‐Compatible RFID Interrogators

An analog front‐end circuit for ISO/IEC 14443‐compatible radio frequency identification (RFID) interrogators was designed and fabricated by using a 0.25 µm double‐poly CMOS process. The fabricated chip was operated using a 3.3 Volt single‐voltage supply. The results of this work could be provided as reusable IPs in the form of hard or firm IPs for designing single‐chip ISO/IEC 14443‐compatible RFID interrogators.     

关于电子企业质量管理的认识和讨论

讨论电子企业在实施ISO9000质量管理体系时面对的挑战与问题,从应用角度提出探索性的看法与建议;为应对激烈的市场竞争,企业需要严密的质量体系与规范的管理制度。