Adaptive restarting method for LCC-HVDC based on principle of fault location by current injection

The existing LCC-HVDC transmission project adopts the fixed-time delay restarting method.This method has disadvantages such as non-selectivity,long restart process,and high probability of restart failure.These issues cause a secondary impact on equipment and system power fluctuation.To solve this problem,an adaptive restarting method based on the principle of fault location by current injection is proposed.First,an additional control strategy is proposed to inject a current detection signal.Second,the propagation law of the current signal in the line is analyzed based on the distributed parameter model of transmission line.Finally,a method for identifying fault properties based on the principle of fault location is proposed.The method fully considers the influence of the long-distance transmission line with earth capacitance and overcomes the influence of the increasing effect of the opposite terminal.Simulation results show that the proposed method can accurately identify the fault properties under various complex fault conditions and subsequently realize the adaptive restarting process.

Global Convergence of a New Restarting Conjugate Gradient Method for Nonlinear Optimizations

Conjugate gradient optimization algorithms depend on the search directions with different choices for the parameters in the search directions. In this note, by combining the nice numerical performance of PR and HS methods with the global convergence property of the class of conjugate gradient methods presented by HU and STOREY(1991), a class of new restarting conjugate gradient methods is presented. Global convergences of the new method with two kinds of common line searches, are proved. Firstly, it is shown that, using reverse modulus of continuity function and forcing function, the new method for solving unconstrained optimization can work for a continously dif ferentiable function with Curry-Altman's step size rule and a bounded level set. Secondly, by using comparing technique, some general convergence properties of the new method with other kind of step size rule are established. Numerical experiments show that the new method is efficient by comparing with FR conjugate gradient method.

Global Convergence of a New Restarting Three Terms Conjugate Gradient Method for Non-linear Optimizations

In this note,by combining the nice numerical performance of PR and HS methods with the global convergence property of FR method,a class of new restarting three terms conjugate gradient methods is presented.Global convergence properties of the new method with two kinds of common line searches are proved.

A RESTARTING DIRECTION FOR THE CONJUGATE GRADIENT METHOD

The main purpose of this paper is to provide a restarting direction for improving on the standard conjugate gradient method.If a drastic non-quadratic behaviour of the objective function is observed in the neighbour of xk,then a restart should be done.The scaling symmetric rank-one update with Davidon’s optimal criterion is applied to generate the restarting direction.It is proved that the conjugate gradient method with this strategy retains the quadratic termination.Numerical experiments show that it is successful.

The Problem Related With Community Radio Concept and Restarting of Community Radio in Sri Lanka

Community radio can be considered as an appropriate media of developing the knowledge and attitudes of listeners by clearly identifying their ideas. Community radio services aid to motivate the community participation in communication successfully, as well as to strength the cultural rights of community. It is a current necessity to use community radio services in the process of obtaining successful results through the currently activated developing projects in Sri Lanka. Many countries in the world use this system to succeed their development projects. In this background, there is a necessity to explore the developmental competencies of community radio in Sri Lanka. Community interests for restarting the community radio in Kothmale, Mahaelluppallama and Giradurukotte were identified by the field research. This research proposes a noval format to restarting and continuous implementation of community radio in Sri Lanka, with the factors revealed in the survey. This project is activated under several steps as a collaborative project of Sri Lanka Broadcasting Corporation （SLBC）, the Department of Mass Communication, University of Kelaniya and the community. Proposed community radio will be controlled by a co-administrative system of University of Kelaniya and community. Technical support and frequency will be taken from Sri Lanka Broadcasting Corperation. The content of programs for community radio will be selected by University of Kelaniya and the community. Financial support will be given by the University of Kalaniya for a period of one year. After that, community radio should get the responsibility for its sustainability. Funds will be obtained through various departmental projects, public services, state and non-governmental organization. Those organizations don＇t have a media to implement programs which focuses on rural development. This new radio format could be used for that purpose. This model named as Campus Community Radio （CCR）. It is important to discuss the restarting of community radio services in Sri Lanka, based on the facts such as the incapability of supplying the necessities of listeners in a background of hypermedia. In addition, failure of identifying the developmental expectations of listeners for the radio services in a national level and the usage of community radio services by many countries in the world such as Philippines and India for the success of their rural projects.

Hyperparameter Tuning for Deep Neural Networks Based Optimization Algorithm

For training the present Neural Network(NN)models,the standard technique is to utilize decaying Learning Rates(LR).While the majority of these techniques commence with a large LR,they will decay multiple times over time.Decaying has been proved to enhance generalization as well as optimization.Other parameters,such as the network’s size,the number of hidden layers,drop-outs to avoid overfitting,batch size,and so on,are solely based on heuristics.This work has proposed Adaptive Teaching Learning Based(ATLB)Heuristic to identify the optimal hyperparameters for diverse networks.Here we consider three architec-tures Recurrent Neural Networks(RNN),Long Short Term Memory(LSTM),Bidirectional Long Short Term Memory(BiLSTM)of Deep Neural Networks for classification.The evaluation of the proposed ATLB is done through the various learning rate schedulers Cyclical Learning Rate(CLR),Hyperbolic Tangent Decay(HTD),and Toggle between Hyperbolic Tangent Decay and Triangular mode with Restarts(T-HTR)techniques.Experimental results have shown the performance improvement on the 20Newsgroup,Reuters Newswire and IMDB dataset.

一种TMR容错服务器永久故障恢复机制的研究与实现

恢复是实现容错系统容错目的和提高系统可用性的重要环节。基于自行研制的TMR容错服务器系统 ,提出了一种以检查点为基础的进程复制恢复技术 ,主要介绍恢复机制的整体结构和实现的关键技术—检测点保存与恢复技术(checkpointing/restart)

开放路由平台中OSPF Graceful Restart的研究与实现

GracefulRestart是一种旨在使路由协议重启的影响最小化的机制,其目的是尽量减少路由器重启导致的路由抖动,减少路由计算资源和网络带宽资源的浪费。在对GracefulRestart机制作深入研究的前提下,对开放路由平台Quagga进行了OSPFGracefulRestart扩展,实现了原型系统。

并行作业容错自动调度环境设计

大型科学与工程计算需要实现空前复杂的数值模拟计算和处理空前庞大的数据,有必要设计一个容错环境,自动调度加载故障程序。基于并行作业和系统提供的checkpoint/restart功能,本文设计了一个用户级的并行作业容错自动调度环境,包括并行程序容错调度的自动感知、自动加载和数据完整性保证算法。测试结果表明,并行作业容错自动调度环境保证了checkpoint数据的完整性,并在应用程序出错退出以后,调度环境可以自动感知,自动提交运行作业,实现了并行作业无需用户干预的容错自动调度计算,避免了系统资源和计算时间的浪费。

Oracle Restart在Oracle 19C中的应用

以Oracle 19C为例,阐述其在数据库软硬件出现故障时,尤其是数据库所在主机异常宕机重启后,通过Oracle Restart功能保障Oracle数据库实例、监听等关键组件在非人为干预下可以自动重启,使数据库持续、可靠地对外提供服务成为可能.

全流水线化光线追踪KD-Tree遍历单元硬件架构

在提出引入restart遍历算法的基础上,构造流水线处理机制,使得硬件架构可以实现整个遍历和相交测试流程模块间(粗粒度)和模块内部(细粒度)完全流水线化.同时,也改进了光线-图元相交测试的浮点算法,能够减少浮点运算单元个数.实验结果在FPGA验证中实现了每秒约处理8千万条光线的能力(100MHz工作时钟).

RESTART亚组分析:通过影像学特征评价脑出血后重启抗血小板治疗对卒中复发风险的影响

2019年5月Lancet Neurol杂志发表了RESTART研究的亚组分析,题目为"Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases:subgroup analyses of the RESTART randomised,open-label trial"。1研究介绍1.1研究背景既往研究提示具有脑出血和脑小血管病的影像学特征与脑出血复发风险增加有关。目前指南及一些学者等建议根据这些影像学特征可用于指导脑出血后是否重启抗血小板治疗。

ON THE BREAKDOWNS OF THE GALERKIN AND LEAST-SQUARES METHODS

The Galerkin and least-squares methods are two classes of the most popular Krylov subspace methOds for solving large linear systems of equations. Unfortunately, both the methods may suffer from serious breakdowns of the same type: In a breakdown situation the Galerkin method is unable to calculate an approximate solution, while the least-squares method, although does not really break down, is unsucessful in reducing the norm of its residual. In this paper we first establish a unified theorem which gives a relationship between breakdowns in the two methods. We further illustrate theoretically and experimentally that if the coefficient matrix of a lienar system is of high defectiveness with the associated eigenvalues less than 1, then the restarted Galerkin and least-squares methods will be in great risks of complete breakdowns. It appears that our findings may help to understand phenomena observed practically and to derive treatments for breakdowns of this type.

Key technologies for the novel distributed numerical control integrated system

A novel distributed numerical control (DNC) integrated system based on plug-in software technology is proposed. It connects new or old numerical control (NC) machine tools which have inhomogeneous numerical control systems with CAD/CAM system by CANbus network. A DNC computer is able to control 15 sets of NC machine tools reliably at the same time. The novel DNC system increases the efficiency of machine tools and improve the production management level by realizing non-paper production, agile manufacturing, networked manufacturing and so on in the near future. Key technologies to construct the novel DNC integrated system include the integration of inhomogeneous numerical control systems, NC program restart, and algorithm for communication competition. Such system has demonstrated successful applications in some corporations that have acquired good economic benefits and social effects.

A New Type of Restarted Krylov Methods

In this paper we present a new type of Restarted Krylov methods for calculating peripheral eigenvalues of symmetric matrices. The new framework avoids the Lanczos tridiagonalization process, and the use of polynomial filtering. This simplifies the restarting mechanism and allows the introduction of several modifications. Convergence is assured by a monotonicity property that pushes the eigenvalues toward their limits. The Krylov matrices that we use lead to fast rate of convergence. Numerical experiments illustrate the usefulness of the proposed approach.

Fault Handling in PLC-Based Industry 4.0 Automated Production Systems as a Basis for Restart and Self-Configuration and Its Evaluation

Industry 4.0 and Cyber Physical Production Systems (CPPS) are often discussed and partially already sold. One important feature of CPPS is fault tolerance and as a consequence self-configuration and restart to increase Overall Equipment Effectiveness. To understand this challenge at first the state of the art of fault handling in industrial automated production systems (aPS) is discussed as a result of a case study analysis in eight companies developing aPS. In the next step, metrics to evaluate the concept of self-configuration and restart for aPS focusing on real-time capabilities, fault coverage and effort to increase fault coverage are proposed. Finally, two different lab size case studies prove the applicability of the concepts of self-configuration, restart and the proposed metrics.

修复Windows 2000中“NTLDR Is Missing”错误的特殊故障

一台安装了Windows2000中文版系统的电脑，开机启动后出现以下错误消息：NTLDR is missing Press any key to restart电脑不能工作。

一次SCALSVT RESTART故障的解决

对一次SCALSVTRESTART故障的查排过程进行了分析。

A Note on Global Convergence Result for Conjugate Gradient Methods

We extend a results presented by Y.F. Hu and C.Storey (1991) [1] on the global convergence result for conjugate gradient methods with different choices for the parameter β k . In this note, the conditions given on β k are milder than that used by Y.F. Hu and C. Storey.

Medical Feature Selection Approach Based on Generalized Normal Distribution Algorithm

This paper proposes a new pre-processing technique to separate the most effective features from those that might deteriorate the performance of the machine learning classifiers in terms of computational costs and classification accuracy because of their irrelevance,redundancy,or less information;this pre-processing process is often known as feature selection.This technique is based on adopting a new optimization algorithm known as generalized normal distribution optimization(GNDO)supported by the conversion of the normal distribution to a binary one using the arctangent transfer function to convert the continuous values into binary values.Further,a novel restarting strategy(RS)is proposed to preserve the diversity among the solutions within the population by identifying the solutions that exceed a specific distance from the best-so-far and replace them with the others created using an effective updating scheme.This strategy is integrated with GNDO to propose another binary variant having a high ability to preserve the diversity of the solutions for avoiding becoming stuck in local minima and accelerating convergence,namely improved GNDO(IGNDO).The proposed GNDO and IGNDO algorithms are extensively compared with seven state-of-the-art algorithms to verify their performance on thirteen medical instances taken from the UCI repository.IGNDO is shown to be superior in terms of fitness value and classification accuracy and competitive with the others in terms of the selected features.Since the principal goal in solving the FS problem is to find the appropriate subset of features that maximize classification accuracy,IGNDO is considered the best.