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Importance measure based optimal maintenance policy for deteriorating components

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High Technology Letters 2014年第1期20卷 42-47页

作者：祁鑫 zuo decheng Zhang Zhan Yang Xiaozong School of Computer Science and Technology Harbin Institute of Technology

An optimal maintenance policy tor deteriorating components based on quasi renew-process model is presented. In this policy, the first N - 1 failures of a component are maintained by repairs and the N＇h failure is maintained by replacement. The policy takes replacement actions at component lev- el by considering the fact that more and more components are designed to be field replaceable and maintenance activities are setting free from system halt. Concerning system structure impact, impor- tance measure is employed in the optimization procedure which aims at maximizing the long-rnn prof- it per unit time. Two example series parallel systems are taken to illustrate the policy and it is proved to work well. According to importance analysis, components are classified into important ones and unimportant ones based on the system behavior under their failures. Simulation results show that the presented policy makes a clear distinction between them and takes effective mainte- nance actions to compensate the deteriorating of components.

关键词： deteriorating components quasi-renew process maintenance policy series paral-lel systems importance measure

I-Neat:An Intelligent Framework for Adaptive Virtual Machine Consolidation

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Tsinghua Science and Technology 2022年第1期27卷 13-26页

作者： Yanxin Liu Yao Zhao Jian Dong Lianpeng Li Chunpei Wang decheng zuo the School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China

With the increasing use of cloud computing,high energy consumption has become one of the major challenges in cloud data *** Machine(VM)consolidation has been proven to be an efficient way to optimize energy consumption in data centers,and many research works have proposed to optimize VM ***,the performance of different algorithms is related with the characteristics of the workload and system status;some algorithms are suitable for Central Processing Unit(CPU)-intensive workload and some for web application ***,an adaptive VM consolidation framework is necessary to fully explore the potential of these *** is an open-source dynamic VM consolidation framework,which is well integrated into ***,it cannot conduct dynamic algorithm scheduling,and VM consolidation algorithms in Neat are few and basic,which results in low performance for energy saving and Service-Level Agreement(SLA)*** this paper,an Intelligent Neat framework(I-Neat)is proposed,which adds an intelligent scheduler using reinforcement learning and a framework manager to improve the usability of the *** scheduler can select appropriate algorithms for the local manager from an algorithm library with many load detection *** algorithm library is designed based on a template,and in addition to the algorithms of Neat,I-Neat adds six new algorithms to the algorithm ***,the framework manager helps users add self-defined algorithms to I-Neat without modifying the source *** experimental results indicate that the intelligent scheduler and these novel algorithms can effectively reduce energy consumption with SLA assurance.

关键词： cloud computing dynamic Virtual Machine(VM)consolidation Open Stack Neat reinforcement learning

Software architecture based software deployment reliability estimation considering architectural style

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High Technology Letters 2012年第3期18卷 281-288页

作者： Su Xihong Wu Zhibo Liu Hongwei Yang Xiaozong zuo decheng School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 P. R. China

Software today often consists of a large number of components offering and requiring services. Such components should be deployed into embedded, pervasive environments, and several deployment architectures are typically possible. These deployment architectures can have significant impacts on system reliability. However, existing reliability estimation approaches are typically limited to certain classes or exclusively concentrate on software reliability, neglecting the influence of hardware resources, software deployment and architectural styles. The selection of an appropriate architectural style has a significant impact on system reliability of the target system. Therefore, we propose a novel software architecture （SA） based reliability estimation model incorporating software deployment and architectural style. On the basis of two architectural styles, we design influence factors and present a new approach to calculate system reliability. Experimental results show that influence factors provide an accurate and simple method of reflecting architectural styles and software deployment on system reliability. It is important for considering the influence of other architectural styles on system reliability in large scale deployment environment.

关键词： software architecture ( SA) software deployment reliability architectural style component

DPHM: A FAULT DETECTION PROTOCOL BASED ON HEARTBEAT OF MULTIPLE MASTER-NODES

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Journal of Electronics(China) 2007年第4期24卷 544-549页

作者： Dong Jian zuo decheng Liu Hongwei Yang Xiaozong School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

In most of fault detection algorithms of distributed system, fault model is restricted to fault of process, and link failure is simply masked, or modeled by process failure. Both methods can soon use up system resource and potentially reduce the availability of system. A fault Detection Protocol based on Heartbeat of multiple Master-nodes (DPHM) is proposed, which can immediately and accurately detect and locate faulty links by adopting voting and electing mechanism among master-nodes. Thus, DPHM can effectively improve availability of system. In addition, in contrast with other detection protocols, DPHM reduces greatly the detection cost due to the structure of master-nodes.

关键词： Distributed Fault detection Heartbeat Voting

RESEARCH ON KEY NODES OF WIRELESS SENSOR NETWORK BASED ON COMPLEX NETWORK THEORY

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Journal of Electronics(China) 2011年第3期28卷 396-401页

作者： Ma Chuang Liu Hongwei zuo decheng Wu Zhibo Yang Xiaozong School of Computer science and technology Harbin Institute of Technology Harbin 150001 China

On the basis of complex network theory, the issues of key nodes in Wireless Sensor Networks (WSN) are discussed. A model expression of sub-network fault in WSN is given at first; subsequently, the concepts of average path length and clustering coefficient are introduced. Based on the two concepts, a novel attribute description of key nodes related to sub-networks is proposed. Moreover, in terms of node deployment density and transmission range, the concept of single-point key nodes and generalized key nodes of WSN are defined, and their decision theorems are investigated.

关键词： Wireless Sensor Network (WSN) Key nodes Fault model Complex network theory

SA BASED SOFTWARE DEPLOYMENT RELIABILITY ESTIMATION CONSIDERING COMPONENT DEPENDENCE

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Journal of Electronics(China) 2011年第1期28卷 118-125页

作者： Su Xihong Liu Hongwei Wu Zhibo Yang Xiaozong zuo decheng School of Computer Science and Technology Harbin Institute of Technology Harbin 150001 China

Reliability is one of the most critical properties of software *** deployment architecture is the allocation of system software components on host *** Architecture(SA) based software deployment models help to analyze reliability of different *** many approaches for architecture-based reliability estimation exist,little work has incorporated the influence of system deployment and hardware resources into reliability *** are many factors influencing system *** translating the multi-dimension factors into degree matrix of component dependence,we provide the definition of component dependence and propose a method of calculating system reliability of ***,the parameters that influence the optimal deployment may change during system *** existing software deployment architecture may be ill-suited for the given environment,and the system needs to be redeployed to improve *** approximate algorithm,A*_D,to increase system reliability is *** the number of components and host nodes is relative large,experimental results show that this algorithm can obtain better deployment than stochastic and greedy algorithms.

关键词： Software Architecture(SA) Software deployment System reliability Component Redeploy

A New Software Reliability Framework —— A Extended Cleanroom Model

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High Technology Letters 2001年第2期7卷 42-46页

作者：姚文斌 Dept. of Computer Science and Eng. Harbin Institute of Technology Harbin 150001 China

Cleanroom software engineering has been proven effective in improving software development quality while at the same time increasing reliability. To adapt to large software system development, the paper presents an extended the Cleanroom model, which integrates object-oriented method based on stimulus history, reversed engineering idea, automatic testing and reliability assessment into software development. The paper discusses the architecture and realizing technology of ECM.

关键词： Cleanroom model Stimulus history Object-oriented method Reversed engineering Automatic testing Reliability assessment

Real-Time Automatic ECG Diagnosis Method Dedicated to Pervasive Cardiac Care

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Wireless Sensor Network 2009年第4期1卷 276-283页

作者： Haiying ZHOU Kun-Mean HOU decheng zuo 不详

Recent developments of the wireless sensor network will revolutionize the way of remote monitoring in dif-ferent domains such as smart home and smart care, particularly remote cardiac care. Thus, it is challenging to propose an energy efficient technique for automatic ECG diagnosis (AED) to be embedded into the wireless sensor. Due to the high resource requirements, classical AED methods are unsuitable for pervasive cardiac care (PCC) applications. This paper proposes an embedded real-time AED algorithm dedicated to PCC sys-tems. This AED algorithm consists of a QRS detector and a rhythm classifier. The QRS detector adopts the linear time-domain statistical and syntactic analysis method and the geometric feature extraction modeling technique. The rhythm classifier employs the self-learning expert system and the confidence interval method. Currently, this AED algorithm has been implemented and evaluated on the PCC system for 30 patients in the Gabriel Monpied hospital (CHRU of Clermont-Ferrand, France) and the MIT-BIH cardiac arrhythmias da-tabase. The overall results show that this energy efficient algorithm provides the same performance as the classical ones.

关键词： Pervasive Cardiac Care Automatic ECG Diagnosis QRS detector Rhythm Classifier Wireless Sensor Networks

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对等网络中的低开销失效检测算法研究

高技术通讯 2012年第11期22卷 1155-1160页

作者：任潇董剑左德承杨孝宗哈尔滨工业大学计算机科学与技术学院哈尔滨150001

针对当前大规模P2P网络失效检测负载对系统可扩展性的影响，对失效检测结果的共享机制展开了研究，提出了一个基于被动订阅机制的低开销失效检测（***）算法。L-FD算法通过被检测节点来建立检测结果的订阅关系，使每个节点只需保持常数... 详细信息

针对当前大规模P2P网络失效检测负载对系统可扩展性的影响，对失效检测结果的共享机制展开了研究，提出了一个基于被动订阅机制的低开销失效检测（***）算法。L-FD算法通过被检测节点来建立检测结果的订阅关系，使每个节点只需保持常数个检测关系即可获得所有邻居节点的失效状态，在节点不发生失效情况下可使检测负载下降为O（N）。该算法的结果共享关系可灵活建立，不受覆盖网拓扑结构及同步时钟等因素的影响，可灵活适应不同的P2P系统。仿真实验及分析结果证实了这一新算法的可行性和有效性。

关键词： P2P网络失效检测结果共享检测负载