谐波平衡法及其改进

本文对谐波平衡法作了概括的介绍.通过单频输入和多谐波输入说明了谐波平衡法的工作原理.文中介绍了分析方法、误差目标函数的建立及具体的算法流程.     

料斗秤控制系统

设计了一种以微处理器Atmega 128为核心，由CPU对三路重量信号采样（AID转换）、计算重量、用中文显示重量及状态，根据重量对料斗秤起振、停振等进行控制，同时输出三路4～20mA电流控制信号，且状态及重量通过RS-232（或RS-485）送PC机，从而取代日本大和CFC100料斗秤控制器。     

SIP认证机制的分析和改进

本文简要介绍了会话初始化协议(SIP)的基本内容,然后对SIP协议中注册和呼叫流程中的认证机制做出了分析,并提出了改进的方法。     

改进的变电站监控系统功能设计

本文针对中小型变电站监控系统功能不足的现状,对运行模块采用实时监控技术,综合考虑保护、测量、通信、远动、事故记录、故障录波、直流和五防等功能。进一步设计了屏幕显示和键盘操作的人机交互功能,实时采集和监控处理功能,图形分析、控制操作和闭锁功能。实现了客户端的业务逻辑处理功能,并将同样的应用功能封装在同一应用模块。     

高精度稳像平台静平衡测量系统设计

为了消除载体抖动对稳像平台光轴稳定性能的影响,研制了基于位置恢复原理的高精度稳像平台静平衡测量系统。在阐述了国内外配重技术研究现状的基础上,重点研究了基于位置恢复原理的配重系统的设计方法,以及基于该系统的稳像平台静平衡测量方法,探讨了提高目前国内稳像平台配重精度的有效途径。进行了重复测量精度及分辨力测试实验,实验结果表明:系统的重复测量精度和分辨力达到了10 g.mm的水平。通过对某两轴稳像平台进行静平衡校正,使其静平衡精度达到了10 g.mm水平,满足了弹载稳像平台的配重要求。     

Automated stepper load balance allocation system

In order to improve productivity in the photolithography process of high-product mix/low-volume factories, an automated stepper load balance allocation system was developed. The system enables us to maintain a balanced load distribution of tool constraint layers among all steppers. We developed a processing time estimation function and a load balance allocation function. The processing time estimation function calculates accurate loads based on the processing times related to the product, the process layer, and the stepper. The load balance allocation function was realized by applying a dynamic programming method. The system has decreased the deviation in the total processing time among all steppers by 10%, compared to the conventional manual allocation method.     

黑龙江省通信公司网间结算系统

介绍了黑龙江省通信公司网间结算系统建设的背景、系统功能及运行效果     

HBP: improvement in BP algorithm for an adaptive MLP decision feedback equalizer

Though the decision feedback equalizer (DFE) with multilayer perceptron (MLP) structure can be trained effectively by the backpropagation (BP) algorithm, it is always accompanied by the problem of local minimum. In order to solve some problems of the local minimum in the BP algorithm and to improve the performance of the BP algorithm under the same MLP structure, we combine the hierarchical approach and the BP algorithm to implement the MLP DFE, and we call the new scheme hierarchical BP (HBP) algorithm. Based on the hierarchical approach, from the input layer to the output layer of the MLP, every two layers of neural nodes (with one hidden layer) will be trained with an individual BP algorithm. Therefore, the entire MLP can be trained by several independent BP algorithms, unlike the standard BP algorithm, which utilizes only one BP algorithm to train the whole MLP structure. The results of performance evaluation indicate that the HBP algorithm not only strongly reduces the mean squared error but also yields a much lower bit-error rate than the standard BP algorithm does for equal computational cost and conditions.     

Residual SAR focusing: an application to coherence improvement

The focusing quality of a SAR processor greatly depends on the accuracy of the system geometry estimate. Sometimes ancillary data do not provide enough accuracy, therefore autofocusing has to be performed to get the finest quality possible. A “residual” azimuth compression is introduced to show how a defocused image can be compensated by means of a monodimensional local operator. The residual transfer function that generates defocusing is then derived. The effects of the defocusing are shown on both a complex single SAR image and a SAR interferogram. SAR interferograms, however, are much more sensitive to defocusing than the single SAR image. Two algorithms have been developed to estimate, and compensate for, the defocusing in both the single SAR image and SAR interferometric cases. The processors select data suitable for estimating focusing parameters from the whole images by exploring Kurtosis (for single image focusing) or coherence (for interferometric autofocusing). The residual, short time-domain operator is then exploited to retrieve the focusing parameter values and, finally, to get the focused image. The limitations and accuracy of the algorithm in terms of parameter estimation are investigated. Experimental results, obtained from different SAR missions, are presented     

How to define system improvement and deterioration for a repairablesystem

The problem of how to define system improvement and deterioration for a repairable system has long been of interest to those who are engaged in reliability analysis. A model-free definition of system behavior is provided. Various properties of the definition are studied. A new model is proposed for a repairable system     

Foetos: an expert system for fetal assessment

Assessment of the fetus in a high-risk pregnancy uses a variety of tests for screening and continued detection of in utero compromise. This paper describes Foetos, an expert system designed to help clinical personnel to interpret several fetal assessment tests: fetal biophysical profile, contraction stress test, and nonstress tests. Foetos has been built using the knowledge engineering tool Genie, which adopts a mixed frame- and rule-based approach to represent the clinical knowledge in the field. Foetos includes diagnostic, prognostic, and therapeutic structures, based on heuristic interpretation of such tests and contextual structures which relate interpretation to the overall clinical picture. The results of initial retrospective and prospective program validation are included in the report. These results show a substantial level of agreement between Foetos' recommendations and clinical management. Interpretation of the results indicates that the obstetrical field could be an area of interest for the application of AI techniques.     

Low-power circuits for the wireless ligament balance measurement system in TKA

A low power system for the ligament balance measuring in Total Knee Arthroplasty is presented in this paper. The system consists two parts: a front-end Ligament Balance Measuring System (LBMS) which is inserted into the knee joint during the operation, and the display part. LBMS is comprised of a sensors array including eight precise force sensors, signal conditioning circuits that support up to 15 force sensors, a sub-threshold microprocessor, power circuits and a 433?MHz RF transceiver for data transmission. The force corresponding to its distribution is transmitted wirelessly and displayed in 3-D in real time with an accuracy of 0.049?N. The signal conditioning circuits, the sub-threshold 8?bit microprocessor and the application specific integrated circuits chip have been designed and fabricated in 0.18???m CMOS process. The tested resolution is 60.1???V_pp (1.35?g) with ±100?mV_pp input. The chip can operate under 1.2 to 3.6?V voltage supply for single battery application with 116?C160???A power consumption. The testing results of the microprocessor show that the leakage power is 46?nW and the dynamic power is 385?nW @ 165?kHz with operating voltage of 350?mV. The simulation results show that the power circuits can provide the supply voltage ranging from 0.3?V to 0.6?V for the sub-threshold microprocessor. Experimental results verified the system. Some clinical experiments will be carried out in the future.     

Force application during cochlear implant insertion: an analysis for improvement of surgeon technique

Highly invasive surgical procedures, such as the implantation of a prosthetic device, require correct force delivery to achieve desirable outcomes and minimize trauma induced during the operation. Improvement in surgeon technique can reduce the chances of excessive force application and lead to optimal placement of the electrode array. The fundamental factors that affect the degree of success for cochlear implant recipients are identified through empirical methods. Insertion studies are performed to assess force administration and electrode trajectories during implantations of the Nucleus 24 Contour and Nucleus 24 Contour Advance electrodes into a synthetic model of the human Scala Tympani, using associated methods. Results confirm that the Advance Off- Stylet insertion of the soft-tipped Contour Advance electrode gives an overall reduction in insertion force. Analysis of force delivery and electrode positioning during cochlear implantation can help identify and control key factors for improvement of insertion method. Based on the findings, suggestions are made to enhance surgeon technique.     

完美技术推进系统演进--SSL VPN技术成为推动BOSS向新一代演进的关键

目前,电信运营商“全业务”竞争的态势已经展开,新的业务和服务层出不穷,对“业务核心”的BOSS系统提出了更高、更强的要求,向新一代的BOSS系统发展成为电信运营商决胜市场的关键。然而,由于传统的组网技术在远程访问和安全方面的局限性,难以满足数据业务高速发展以及“三网合一”趋势的需要,这已经成为BOSS系统发展的障碍,因此,改造现有的系统势在必行。那么,应该如何进行改造?采用何种技术呢?BOSS:期待新发展随着我国电信市场竞争格局的形成,以及进入WTO带来的市场开放的挑战,竞争的焦点从资源竞争逐渐转向了以加强IT技术建设为…     

系统负载均衡解决方案

提出了解决多链路接入Internet、多防火墙负载均衡、多应用服务器负载均衡及SSL加速服务的全冗余优化网络应用的解决方案，网络经过优化后，使得应用服务的性能、可靠性、安全性、可管理性等得到显著提高。     

虚拟演播室系统性能的改进

以ORAD Cyberset-E系统为例说明了虚拟演播室系统的数据流程，并从如何提升网络识别性能、调校色键参数、使用系统快捷键诸方面揭示了提升系统性能的有效途径。     

Smoothing as an improvement on filtering: a universal bound

Comparison is made between the mean-square errors Pf and Ps associated with the linear least-squares filtered and smoothed estimates of a stationary process of spectral density S(?) in white noise of spectral density No. A universal curve is obtained which relates the minimum possible value of Ps/Pf to ?max{S(?) No}. The curve sets a bound on the maximum improvement over filtering which smoothing will offer, in terms of the maximum signal/noise ratio.     

改善洁净系统空调机组性能的几点认识

根据多年的实践经验，对质量有差异的空调机组性能进行对比，找出关键点，旨在倡导全面改善洁净空气系统空调机组的性能，以实现洁净空气系统的经济、稳定运行。同时也促进空调行业的长足发展。     

Web网络大数据分类系统的设计与改进

Web网络中的数据量巨大,传统系统只采用软件或只采用硬件实现Web网络大数据分类系统的设计,所需消耗的系统资源较多,处理时间长,配置与管理不灵活,无法满足实时性的要求。为此,设计一种新的Web网络大数据分类系统,采用软硬件相结合的形式对Web网络大数据分类系统的总体结构进行设计,分析了的系统硬件结构,主要包括数据采集器、Web网络处理器、网络接口和存储模块,并详细介绍了各硬件结构。软件设计中,给出数据采集和大数据分类的部分代码,对大数据分类的实现进行了改进。实验结果表明,采用所设计系统对Web网络大数据进行分类,不仅分类精度高,而且能耗较低、效率较高,具有好的分类性能。