Systems management of operational support systems applications

This paper discusses some of the challenges of providing systems management to BTs operational support systems (OSS). As the OSS evolve to exploit the three-tier distributed architecture, the provision of successful systems management solutions must overcome many problems, including those of scale, scope, functionality, integration, rate of change, and the relative immaturity of available solutions. The enterprise systems management framework (ESMF), BTs solution to the systems management requirements of three-tier distributed computing systems, is described. The ESMF takes a standards-based approach, integrating suitable tools into a management framework. This framework has then been extended in novel ways to provide the overall solution.     

Multi-expert operational risk management

Operational risk management is the process of monitoring, evaluating, and changing courses of actions with potential detrimental consequences in real time. In this paper, we extend the decision models proposed in the literature for individual risk managers to account for situations where multiple risk managers are involved. For this purpose, two dynamic and adaptive preference aggregation models for cardinal and ordinal assessments are proposed and discussed. The mechanical aspects of the models are then validated using field data collected from experienced operational risk managers in an individual-expert setting. Sensitivity analysis indicates that the models have enough flexibility to be adapted to account for behavioral considerations. The paper closes with a research agenda     

Current-feedback operational amplifiers and applications

The current-feedback operational amplifier (CFOA) is a relatively new arrival in the analogue designer's tool kit. The first monolithic device was produced by Elantec Inc. in 1987 and since then it has intrigued and puzzled many. Is it really better than the conventional and well known voltage-feedback operational amplifier (VOA)? How does the CFOA differ in design? What are the applications where it performs better than the VOA and when should the VOA be used in preference to the CFOA? We attempt to give some insight into the design and performance of the CFOA and to answer these questions     

The BT operational support systems architecture

This paper outlines the process and systems framework that BT has developed to assist in the design, development and procurement of operational support systems.     

小型无线电监测系统的运行环境及其安装与配置

小型无线电监测系统，是用计算机终端通过互联网络加物理隔离远程控制的小型无线电监测系统，能完成一般的监测功能。由于是通过互联网络进行信息的传输，计算机系统难免出现问题。以往监测人员只涉及监测系统的操作使用，对系统出现的故障一般要依赖厂家来解决问题，颇耽误时间、影响工作。这次，在小型无线电监测系统的安装调试过程中，我将安装配置过程做一个总结，希望能给有同样系统的使用者一些帮助。     

管理信息系统与实时监视系统接口的研究

电力工业的特点使其生产、技术的管理乃至领导的决策都需要调度中心所收集的电网实时运行数据.本文研究以局部网络(LAN)构成的电力管理信息系统怎样实现与调度自动化实时系统的联结.并以流行的以太网络(Ethcrnet)为对象着重分析总线竞争型局部网络中电网实时信息的接收、传送和处理.     

Design and applications of the operational floating amplifier (OFA): The most universal operational amplifier

The operational floating amplifier (OFA) is the most universal type of operational amplifier. Both input and output ports are floating ports, i.e., free from restrictive ground connections. The floating input port enables the OFA to accurately equate two voltages between the two input terminals, like a standard operational amplifier, but in addition to that the OFA is able to accurately equate two currents through the two terminals of the floating output port. Specific applications are given, such as current amplifiers, voltage-to-current converters, gyrators, hybrids, and filters. The concept of the OFA allows these analog transfer functions to be realized with the absolute minimum number of accurate internal and external elements necessary to accurately determine the transfer. The OFA does not need accurate internal matched elements, except for offset, to obtain accurate overall transfer functions. This is in contrast to other current-output devices, such as the current conveyer, which transfer depends on the accuracy of internal current mirrors. Several designs of class A and class AB OFAs based on different topologies are presented and compared. This paper gives an overview of the application, the specification, and the design.     

Linear circuit applications of operational amplifiers

Some of the most frequently encountered linear circuit applications of operational amplifiers are discussed in this article. Included are details of differential dc amplifiers, bridge amplifiers, analog integrators, differentiators, line-driving amplifiers, ac coupled feedback amplifiers, current-to-voltage converters, reference-voltage sources, voltage regulators, current amplifiers, and charge amplifiers.     

Data management software for minicomputer production monitoring and control systems

A two-level software system for minicomputers suitable for use in real-time production monitoring and control applications has been designed and implemented. The first level consists of a general-purpose file system implemented in the form of a voluntary virtual memory which can be added to most minicomputer software systems. The second-level software is a set of data management primitives which permit the definition, creation, maintenance, modification, and referencing of large, interlinked, complex data bases which arise in discrete parts manufacturing applications. The software system is described. The application to a discrete parts manufacturing control system is described along with experimental measures of response time and memory requirements.     

The potential for open source software in telecommunications operational support systems

Over the last five years, open source software has moved into mainstream areas such as Internet and financial applications, with software such as Linux and Apache Web Server now supporting mission-critical operations. Open source software can offer both cost reductions and improvements in software quality. However, the uptake by incumbent telecommunications providers has been virtually zero, instead focusing on major commercial-off-the-shelf (COTS) packages, due to a mixture of prior strategic investments and perceptions over open source risks. This paper addresses the scope for use of open source software in telecommunications operational support systems (OSS). Firstly, the technical scope for open source software is addressed, covering the maturity of available open source software components, and the ways in which these components can have an impact on OSS software architecture. Secondly, the commercial aspects are presented, covering benefits, commercial models and risks. An OSS life cost comparison of open source versus COTS software is included. Thirdly, a test OSS created by BT using primarily open source software, combined with OSS standards to provide a minimum cost base, is presented and analysed. The paper concludes with a statement on the potential for the use of open source software in OSS, and suggests possible next steps.     

The management and the risk

This article is devoted to the management problem of providing an environment favorable to the development of a reliable information and processing base for predictive technology. Much of the article is focused on assessment of risk in large projects that involve an organization of substantial size with several organizational levels and perhaps several departments. The discussion applies to all stages?mission definition, conceptual solution, development and implementation, evaluation of feedback.     

危险分析方法及其应用

信息安全需要理论和方法上的创新,传统安全领域的实践经验值得借鉴和学习。本文探讨了传统安全领域的危险分析方法及其在信息安全领域的应用,以推动我国信息安全领域理论和方法的研究。     

Knowledge-based systems as operational aids in power systemrestoration

The background of power system restoration is analyzed and how this process might benefit from the use of knowledge-based systems is discussed. After describing the state of the art of knowledge-based systems for power system restoration, efforts are made to review knowledge-based techniques to handle system restoration problems. The experiences of system development are reported and evaluation of the systems is addressed. Some needed technological innovations are listed that are required before knowledge-based systems can extensively be applied to power system restoration     

自动调零运算放大器——便携式信号调理应用固有的优点

乍一看,"自动调零"运算放大器好像是个新术语,但事实上这一概念已存在几十年了.本文将探讨自动调零运放的历史,并将大致描述该架构.此外,本文还将探讨该架构在信号调理应用中固有的优点.最后还将分析一个应用示例,以进一步比较自动凋零运放的架构与传统运放的架构.     

A high performance CNFET-based operational transconductance amplifier and its applications

High performance electronic systems face several challenges in driving innovative integrated circuits when the internal transistors are scaled down below 45 nm. Carbon nanotube field effect transistors (CNFETs) are considered as excellent candidates for building energy-efficient electronic systems in the near future, due to their unique characteristics such as ballistic transport, scalability, and better channel electrostatics. In this paper, a new high performance operational transconductance amplifier (OTA) based on 32 nm CNFET devices is presented. The proposed OTA maintains a highly linear wide continuous tuning range and a wide frequency response range, enabled by splitting the linear voltage-to-current conversion and tuning two different blocks. As an application, a universal second-order transconductance-capacitor (G _m  ? C) filter realized using the OTA is introduced. Simulation results show that the CNFET-based OTA offers very a low current consumption of 2.35 μA from a ± 0.9 V power supply, achieves a bandwidth of 9.5 MHz, and has an input dynamic range of ± 0.2 V.     

Commercial implications of operational risk for service-based contracts

This paper explores the relationship between operational risk management and commercial risk management applied to service-or output-based contracts. It examines the development and characteristics of service-based contracts and outlines an approach to modelling service credit exposure. Trade-offs between contract performance, service credit exposure and operational investment are discussed within the context of contract negotiation. Finally, the prime/subcontractor relationship is examined with respect to flow-down of output-and input-based specifications, together with the potential difficulties arising from an adverse combination of the two.     

区域监测网监控系统的工作模式及其在监测管理中的地位和作用

1概述 武汉地区无线电监测网的多数站点为无人值守．需遥控使用,因此当地建立了一套完整有效的监控体系。它如同监测站工作人员的“千里眼”和“顺风耳”．只有了解它的性能结构和工作模式,并熟练掌握其操作方法,才能充分发挥其作用。为此．本文将针对该监控系统的结构、特性以及使用方法．对系统的工作模式进行试论,以便让读者从中了解它在监测管理工作中的地位和作用。     

信息安全风险评估及辅助工具应用

信息安全风险评估是构建信息安全保障体系的重要手段。论文阐述了信息安全风险评估技术,在此基础上开发了风险评估辅助软件,并进行了软件的应用研究。     

Review of software tools and methods used in operational support systems development

This paper provides some background to the diversity of software development environments and tools used within BT. Past and present approaches to the subject are described, along with some of the lessons learned along the way. The paper explains why BT is concerned to use modern tools to give higher productivity and describes the work going on to standardise the operational support systems infrastructure and reduce the large number and variety of tools used. The companys huge software portfolio, covering systems of all sizes from standard (but very large) invoicing systems to complex systems which interact in real time with the voice and data networks, means that BT has to live with a diverse set of software environments and the large variety of tools which go with them. The challenge is to control the diversity in a rapidly changing industry.