共查询到19条相似文献,搜索用时 820 毫秒
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梅钢公司在生产过程控制和信息化系统建设及其改造过程中,本着科学、可靠和适用的原则,在计算机高可用性方面,不同时期采用了不同的高可用性技术和计算机系统组态策略,如计算机集群技术、虚拟化技术和容错技术等,以满足公司各生产单元的过程控制系统和公司信息化系统的稳定、高效、灵活等要求.通过梅钢实际应用的典型案例,从高可用性技术效果的角度,分析其技术特点,折射出梅钢在计算机主机设备高可用性技术方面的探索发展之路. 相似文献
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随着计算机应用系统在企业生产中所承担的角色越来越重要,构建高町用性计算机系统成为保证应用系统稳定运行的重要手段.本文介绍了宝山钢铁股份有限公司小锈钢分公司设备管理系统中,在B/S三层架构下的集群技术的应用.利用集群技术使B/S架构下的应用服务器和数据库服务器实现互为热备份,从而充分利用现有系统资源,在不增加投资的前提下,构建一个具有高可用性的计算机系统,消除单点故障,实现应用系统的不间断运行. 相似文献
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刘利 《Canadian Metallurgical Quarterly》2011,28(2)
基于校园网数据存储的实际需求,在分析当前校园网数据存储存在问题和实际需求特征的基础上,系统研究了网络附加存储技术(NAS,Network Attached Storage)和存储区域网络技术(SAN,Storage Area Network)的技术特点,构建了基于NAS和SAN技术校园网数据存储结构的策略模型,该模型提供了一种高性能、高可靠性、高可用性和高可扩展性的海量校园网数据存储架构. 相似文献
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高宁 《Canadian Metallurgical Quarterly》2011,(4)
IBM WAS NP是一款符合J2EE标准的基础软件,是Java EE和 Web服务应用程序平台.它的集群功能为业务系统提供负载均衡、可扩展和高可用支持.一种典型集群架构包括1个Deployment Manager、2个应用程序服务器节点和2个Web服务器节点,通过Web服务器和应用程序服务器的灵活配置和扩展可提高集群的硬件资源利用效率和高可用性. 相似文献
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生产控制与管理系统 (简称L3)是宝钢集团一钢公司不锈钢工程的重要组成部分 ,该系统的建成极大地提高了企业的生产控制与管理水平。对于这样一个大型OLTP系统 ,采用了基于三层架构、先进的计算机信息系统 ,三层架构包括VB客户端、Tuxedo中间件和Oracle数据库。讨论了在三层架构下L3开发过程中遇到的困难及其解决方法 ,也论述了三层架构下对L3授权管理的改进。分析了基于三层架构的L3运行系统出现的故障 ,并提出了相应的解决方案 相似文献
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利用高生坯强度润滑剂开发无线通讯装置用PM软磁零件 总被引:1,自引:0,他引:1
软磁烧结铁框是无线通讯装置中的一个重要零件,用其来防止电子元件间的电磁干扰和对人有害的电磁辐射。铁框结构复杂且轻巧,依据电子电路的具体设计,壁厚可薄至0.8mm。传统的金属冲压成形因零件挠曲而不能满足尺寸公差与平直度的要求。用粉末冶金工艺制造铁框面临的难题是因壁薄,截面处易碎而使生坯难以搬运。用常规的硬脂酸锌或EBS蜡之类润滑剂混粉,生坯的废品率高达50%。因此,采取了用新近开发的高生坯强度润滑剂,制造烧结铁框的方法。为使开发的烧结铁框能达到磁性要求,选用了添加0.45%磷的高纯铁粉ATOMET 1001HP。采用冷压、温压及在压制后进行和不进行固化的不同工艺,测试了几种高生坯强度润滑剂纱列,从中选出了一种使压坯强度满足粉末冶金铁框压坯搬运要求的润滑剂系列,从而大大降低了生产成本。 相似文献
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介绍了日立水冷IGBT传动系统的原理、大容量传动系统的硬件及软件构成.针对攀钢实际应用情况,对可能出现的故障进行了诊断和分析,并阐述了IGBT备件的采购和更换原则.酸洗—轧机主机系统采用IGBT传动系统,增强了主机系统的稳定性,降低了故障率. 相似文献
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Adaptation and verification of the relocatable Gill-Thomas-Cosman frame in stereotactic radiotherapy
HM Kooy SF Dunbar NJ Tarbell E Mannarino N Ferarro S Shusterman M Bellerive L Finn CV McDonough JS Loeffler 《Canadian Metallurgical Quarterly》1994,30(3):685-691
PURPOSE: Stereotactic radiotherapy (SRT) combines techniques of stereotactic radiosurgery (SRS) with radiation therapy fractionation schemes. Fractionation in SRT necessitates a relocatable immobilization system to precisely reproduce the patient's position at each treatment. The Gill-Thomas-Cosman (GTC) head frame is such an immobilization device compatible with the Brown-Roberts-Wells (BRW) stereotactic system. We describe this device, our modifications to the original design, the repeat position accuracy, and the daily verification procedure. METHODS AND MATERIALS: The original GTC frame was tested on volunteers. This testing led to an improved strapping system, the decision to construct the oral fixation appliance at our dental clinic, and the construction of a depth confirmation helmet to rapidly confirm the position of the frame on a daily basis. The GTC frame, at our institution, is not acceptable for children requiring anesthesia, and a new frame, the "Boston Childrens' Hospital" frame, was designed. This device uses the base ring of the GTC frame. Airway access is maintained through fixation on the nasal-glabellar region and the ear canal rather than the hard palate and upper gingiva. RESULTS: The modifications of the GTC frame and the verification protocol result in repeat positioning of the frame with respect to the patient anatomy, with a standard deviation of 0.4 mm for both the modified GTC frame and the Boston Childrens' Hospital frame. The relocatibility of the frames has been established in over 2,000 patient setups in over 60 patients to date. DISCUSSION: The GTC frame is a noninvasive and versatile fixation system that provides patient comfort, as well as accurate relocatibility for SRT. The frame is not appropriate for single fraction radiosurgery, as a large setup error (> 2 mm) for a single treatment cannot be excluded. The GTC frame is compatible with the BRW system, and treatment planning for SRT and SRS patients is identical. We currently treat 10-13 SRT patients per day with intracranial neoplasms on a dedicated stereotactic therapy unit. In addition, the Boston Childrens' Hospital frame allows the use of stereotactic therapy in the treatment of children under 6 years of age. This population will benefit especially from precise and highly focal cranial irradiation. 相似文献
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针对钢铁行业中传统设备管理存在的弊端,给出了一种智能设备管理系统的解决方案。在概述设备管理相关理论的基础上,详细阐述了智能设备管理系统的架构,重点介绍了设备编码、业务流程以及点检仪数据采集过程,并给出了实施效果。该方案对于提高中小企业的设备管理水平具有一定的参考价值。 相似文献
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OBJECTIVE: Right-angle dual-headed tomography has increased cardiac SPECT utility by cutting acquisition time in half which enhances gating capabilities. When gating, however, a deceleration in heart rate, due to a return to baseline rate after stress or lessened anxiety at the end of a study, may significantly affect the last step(s) of a gated study with possible frame or information loss. The purpose of this study was to illustrate the artifacts produced in myocardial perfusion studies when a frame or frames are lost in single- and dual-detector SPECT imaging methodologies. METHODS: A near-normal 99mTc-sestamibi study was obtained using a dual-headed camera system fitted with high-resolution, long-bore collimators. The normal study was processed including all frames (1-32). To demonstrate the effect of losing frames on a dual-headed system, the study was processed three different ways to simulate frame loss. RESULTS: Loss of frames at the end of a SPECT acquisition results in significant inferoseptal wall defects, left ventricular lumen narrowing, as well as thinning of the anterior and lateral walls. The overall appearance of the heart is a more oval-shaped heart with decreased perfusion. The effect of losing the last frame in a dual-headed camera system as opposed to losing the last frame in a single-headed camera system is more substantial. CONCLUSION: A scan resulting in the loss of a frame in either a single- or a dual-headed camera system creates artifacts in the myocardial wall and should always be repeated. It is significant to note that artifacts present in a dual-headed system are much more prevalent than in a single-headed system due to the nature of dual-headed acquisition parameters. 相似文献
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武钢4~#高炉大修炉顶压力由0.15MPa提高至0.20MPa,对粗煤气系统钢结构、设备及管道进行了验算和补强.煤气清洗系统工艺及设备进行了技术改造。 相似文献