塘沽电信管理网方案的探讨

在概述电信管理网、天津电信管理网和塘沽现有的电话网集中操作维护系统的基础上，对如何将塘沽现有的电话网集中操作维护系统接入天津电信管理网，以形成塘沽电信管理网的问题，提出了一些设想。     

一种改进的网格作业管理实现方法

面向服务的网格中，实现作业管理的应用程序一般采用多线程机制。这种方法相对于可以划分为相互独立子任务的网格作业而言，灵活性欠缺，而且会造成中心服务器负载过重、资源浪费、导致系统效率降低。针对这个问题，提出了一种“主任务分发-子任务签单”的机制实现作业管理，该机制能够较好地解决面向服务的网格中，具有此类特点的作业的管理方法存在的问题。     

一种基于本体语义的网格服务发现模型

在网格环境中,网格服务的发现机制对于系统的性能和效率有着重要的意义和作用。目前网格服务发现模型多数是集中式的、基于关键字的服务匹配模型,缺乏灵活性和推理能力,发现结果难以令人满意。提出了一种基于本体论语义和Agent代理的网格服务发现模型。采用Agent代理技术进行服务搜索,不同的代理能够提供不同领域的本体知识库,从而达到多领域的服务发现;利用本体论语义进行服务的匹配,从而达到智能化的服务发现。该模型提高了服务发现的准确率,同时也增强了系统的可维护性、灵活性和扩展性以及服务管理的自治性和容错性。     

An Integrated Approach to Thermal Management in High-Level Synthesis

Thermal effects are becoming an important factor in the design of integrated circuits due to the adverse impact of temperature on performance, reliability, leakage, and chip packaging costs. Making all phases of the design flow aware of this physical phenomenon helps in reaching faster design closure. In this paper, we present an integrated approach to thermal management in architectural synthesis. Our synthesis flow combines temperature-aware scheduling and binding based on feedback from thermal simulation. We show that our flow is effective in preventing hotspot formation and creating an even thermal profile of the resources. Our integrated thermal management technique on average reduces the peak temperature of the resources by 7.34 degC when compared to a thermal unaware flow without increasing the number of resources across our set of benchmarks     

An Improved Management Approach to Upgrade Avionic System Reliability

This paper presents an improved reliability-program management-approach for upgrading avionic system reliability. Management of the program was by means of an improvement control plan that included continuously updated field performance data, the improvements planned, and projections of the numerical reliability increase with the changes incorporated. The use of special teams working concurrently to improve design, parts, and manufacturing processes is discussed. Presented are measured field results that verify the effectiveness of these improvement efforts.     

An Information-Based Approach to Sensor Management in Large Dynamic Networks

This paper addresses the problem of sensor management for a large network of agile sensors. Sensor management, as defined here, is the process of dynamically retasking agile sensors in response to an evolving environment. Sensors may be agile in a variety of ways, e.g., the ability to reposition, point an antenna, choose sensing mode, or waveform. The goal of sensor management in a large network is to choose actions for individual sensors dynamically so as to maximize overall network utility. Sensor management in the multiplatform setting is a challenging problem for several reasons. First, the state space required to characterize an environment is typically of very high dimension and poorly represented by a parametric form. Second, the network must simultaneously address a number of competing goals. Third, the number of potential taskings grows exponentially with the number of sensors. Finally, in low-communication environments, decentralized methods are required. The approach we present in this paper addresses these challenges through a novel combination of particle filtering for nonparametric density estimation, information theory for comparing actions, and physicomimetics for computational tractability. The efficacy of the method is illustrated in a realistic surveillance application by simulation, where an unknown number of ground targets are detected and tracked by a network of mobile sensors.     

An Ontology-Based Multi-Agent System for Active Software Engineering Ontology

The ongoing trend towards multi-site software development not only brings the benefits but also creates additional challenges regarding remote communication and coordination. The Software Engineering Ontology (SE Ontology) was first developed to clarify the software engineering concepts and project information, and to enable knowledge sharing among dispersed teams. However, the current SE Ontology has the same passive structure as other ontologies that exist on the Web. Passive structure refers to a need to know exactly the concepts and relationships to which users are referring in the ontology. Otherwise, he/she may not be able to obtain the knowledge required. What is needed is active support that can help users find the information they need and provide them with meaningful output. In this paper, we propose an active Software Engineering Ontology through Multi-Agent System (SEOMAS) framework which is intended to provide active support to access software engineering domain knowledge and to recommend software project information captured in the SE Ontology. The UML and Agent UML are used to formalise the SEOMAS framework and to model interactions between the various agents. The prototype is developed and evaluated using several scenarios of the online shopping system development as a case study.     

An Integrated Approach for Agricultural Ecosystem Management

Sustainable development and growth of agriculture sector calls for improving its competitiveness through a better understanding of lands, weather and climate, and planting, especially prediction of events with increased accuracy, and systematic integration of observations and prediction into decision-making in agriculture management. In this short paper, a systematic approach based on integrated information systems (IISs) for agricultural ecosystem management is proposed. The approach involves establishing an IIS called agricultural ecosystem enterprise information system (AEEIS) that extracts data on terrain, land use, planting, and others, and integrates them for the purpose of agricultural and ecosystem management. The integration helps in generating managerial/policy alternatives in consultation not only with agricultural and ecological specialists, but also with agriculture and ecosystems management. AEEIS, a platform of enterprise information systems, includes operational database, extract transform and load, data warehouse, data mining, simulation modeling, and knowledge management for generating managerial strategies on land use, planting species/variety, and optimal coverage of plants. AEEIS is part of efforts on integrated agricultural information services that is one of the main applications of China's sustainable agricultural development plan. The short paper concludes that, for effective management of agriculture and ecosystems, a systematic approach is essential in which IISs play a crucial role.     

An Approach to Frequency Assignment

Frequency assignment should be based on minimization of the unwanted interactions between equipment in an environment. An approach to this problem is developed, based on the operations research technique known as dynamic programming. The basic tools required are an interference prediction model that is capable of providing relative values and a means of deciding which objective function is to be evaluated, i.e., which environmental interference measure is to be used. This concept is not presented as a procedure to be followed but as a logical framework to be modified as desired.     

一种超分辨距离多普勒成象方法

众所周知,距离多普勒成象雷达的距离分辨力和横向分辨力分别取决于发射信号的有效带宽和目标相对于雷达视线在相干处理区间内的转角,本文的研究工作旨在突破普通的FFT距离多普勒处理的限制,大大提高距离多普勒成象雷达的分辨能力,我们采用的方法是在进行付里叶重建之前用线性预测进行数据外推,用微波暗室试验数据进行转台成象的初步结果表明,这是一种改善距离多普勒成象雷达分辨能力的颇有前途的方法。     

s-t路径确定方法的研究

确定网络ｓ－ｔ间的路径是利用路径枚举法计算网络可靠性及确定ｓ－ｔ路由所必须的。本文在对以往确定网络ｓ－ｔ间路径算法的研究基础上,提出了一种新的确定路径的算法－邻接矩阵算法,该算法不仅节省计算机内存,减少了计算量,而且用节点序列表示的路径可方便地用于同时考虑节点和边失效情况下的网络可靠性计算。     

An Integrated-Circuit Approach to Extracellular Microelectrodes

This paper describes a new multielectrode microprobe which utilizes integrated-circuit fabrication techniques to overcome many of the problems associated with conventional microelectrodes. The probe structure consists of an array of gold electrodes which are supported on a silicon carrier and which project beyond the carrier for a distance of about 50 ? to allow a close approach to active neurons. These electrodes are covered with a thin (0.4-?) layer of silicon dioxide which is selectively removed at the electrode tips using high-resolution photoengraving techniques to define the recording areas precisely. The processing sequence described permits any two-dimensional electrode array to be realized. Interelectrode spacings can be accurately controlled in the range from 10 to 20 ? or larger, and electrode-tip diameters can be as small as 2 ?.     

An MSK Approach to Offset QASK

This paper demonstrates that an offset quadrature amplitude-shift-keyed (OQASK) signal can be represented as an ncomponent version of a minimum-shift-keyed (MSK) signal. For example, the signal set obtained by summing two MSK signals which are 6 dB different in power and are formed by continuous phase, frequency modulating the same oscillator with two independent binary antipodal data streams, is spectrally equivalent to an OQASK signal set composed of 16 signals in which the symbol pulse is a half-cycle sinusoid rather, than the conventional rectangular form. Such generalizations as the above allow for potentially simpler implementation of spectrally shaped OQASK.     

PtSi接触合金化的一种方法

在制作X35电路系列中,发现PtSi接触合金化是Al/Ti/PtSi/Si欧姆接触的关键。光刻双电极孔,完成Pt溅射之后,在H_2N_2混合气中,采用三种温度(200～300～550℃)一次热处理合金化,不但促进PtSi的形成,而且大大改善了其上面薄氧化层的质量,从而可以得到良好的欧姆接触,提高了电路的成品率和参数。     

An Empirical Bayes Approach to Reliability

A Bayesian reliability estimation technique known as the ``empirical Bayes approach' is developed which uses previous experience nce to get a Bayesian point estimator. The techniques require no knowledge of the form of the unknown prior distribution and are robust to assumptions about its form. Empirical Bayes techniques are applicable to situations in which prior, independent observations of the random variable X from the random couple (?, X) are available where ? is the observed parameter of interest distributed in accordance with the unknown prior distribution. Performance comparisons of the empirical Bayes and other well established techniques are developed by examples for the binomial, exponential, Normal, and Poisson situations which often occur in reliability problems. In all cases the empirical Bayes estimator performed better than the classical estimator in minimizing the average squared error.     

超短波通信链路分析

主要从通信系统设计的角度出发,对超短波通信链路分析进行了初步探索,介绍了能量传播分析法和链路余量分析法以及多径条件下的考虑。结合工程实践,给出了超短波通信链路分析示例,这将有助于系统工程师预知系统设计性能、控制技术风险、进一步提高信道估值的可信度。     

有线电视收视费分帐管理初探

有线电视收视费分帐是有线电视收费管理中一项重要而复杂的工作。本文论述了这项工作的定义及重要性,建立了分帐的计算模型,最后分析了对分帐实行计算机管理的必要性及实现的思路。