FAULT IDENTIFICATION IN HETEROGENEOUS NETWORKS USING TIME SERIES ANALYSIS

Fault management is crucial to provide quality of service grantees for the future networks, and fault identification is an essential part of it. A novel fault identification algorithm is proposed in this paper, which focuses on the anomaly detection of network traffic. Since the fault identification has been achieved using statistical information in management information base, the algorithm is compatible with the existing simple network management protocol framework. The network traffic time series is verified to be non-stationary. By fitting the adaptive autoregressive model, the series is transformed into a multidimensional vector. The training samples and identifiers are acquired from the network simulation. A k-nearest neighbor classifier identifies the system faults after being trained. The experiment results are consistent with the given fault scenarios, Which prove the accuracy of the algorithm. The identification errors are discussed to illustrate that the novel fault identification algorithm is adaptive in the fault scenarios with network traffic change.     

Bioethanol Fermentation from Stalk Juice of Sweet Sorghum by Immobilized Yeast

Nowadays, energy is the key and seriousproblem in most countries of the world with theexhausting fossil-fuel resources and more increas-ing consumption demands. Meanwhile any energysource should be evaluated with consideration of itsenvironmental impacts[1]. So refining renewableenergy from green plants is the major project.Some countries rich in agricultural resources ex-ploit vigorously carbohydrate crops and starchcrops to refine ethanol and develop alternative fu-els, such as Brazil, Amer…     

DYNAMIC REQUEST DISPATCHING ALGORITHM FOR WEB SERVER CLUSTER

Distributed architectures support increased load on popular web sites by dispatching client requests transparently among multiple servers in a cluster. Packet Single-Rewriting technology and client address hashing algorithm in ONE-IP technology which can ensure application-session-keep have been analyzed, an improved request dispatching algorithm which is simple, effective and supports dynamic load balance has been proposed. In this algorithm, dispatcher evaluates which server node will process request by applying a hash function to the client IP address and comparing the result with its assigned identifier subset; it adjusts the size of the subset according to the performance and current load of each server, so as to utilize all servers＇ resource effectively. Simulation shows that the improved algorithm has better performance than the original one.     

综交运输、城镇化2规划或将出台——谨慎看待对商用汽车行业的利好影响

据报道,国家有关部门正在酝酿出台有关综合交通运输和城镇化方面的发展规划,而交通建设(包括基础、管理和运行)与城镇化发展态势正好一起构成了商用车尤其是卡车、专用汽车和挂车主要市场的晴雨表。然而,基于对前几年一些规划意见颁布实施得与失的考量,国家今后出台的任何规划意见都将从新的战略思维——稳中求进出发;因此,行业需谨慎看待,不要过分奢望。     

我国海事调查体制之我见

根据《中华人民共和国海上交通安全法》第43条的规定,“船舶、设施发生的交通事故,由主管机关查明原因,判明责任”,这里明确赋予了海事主管机关调查海上交通事故的职责。交通部在《海安法》的基础上制定了《中华人民共和国海上交通事故调查处理条例》,具体规范了海事调查处理工     

浮式风机动力系统的线性耦合动力学分析

浮式风机的前期开发需通过大量的方案比选确定结构基本形式和主尺寸参数,对动力学数值模拟效率提出了较高的要求。与时域非线性耦合模拟法相比,频域线性模拟法更适用于概念设计阶段。对此,文章提出了一种高效的线性耦合数值分析方法。采用了九自由度动力学模型描述浮体、塔筒以及叶轮的运动,对结构动力、气动力以及水动力问题进行线性化处理后,将动力学控制方程写成状态空间表达形式,进而推导出环境扰动-结构响应的传递函数,实现结构-控制系统在频域内的联动求解。为了验证模型的有效性,以时域非线性耦合软件Open FAST作为参考,对比了某半潜式风机在风浪联合工况下的运动响应。结果表明,线性模型的响应标准差相对误差大多在20%以内,而计算效率有大幅度提升,为概念设计阶段的结构选型及主尺寸优化设计提供了高效的分析工具。     

水上交通事故分类与统计方法探讨

随着世界航运业的发展,水路运输、港区作业日益繁忙,船舶密度不断增大,导致船舶交通事故数量也呈上升趋势.所以为了预防和减少事故的发生,对事故进行分类和统计就成了水上安全管理中最基本也是最重要的工作之一.文章旨在通过分析我国与IMO及世界其他国家在水上交通事故的分类、统计方法的区别,指出我国在分类、统计方法上的不足,并提出改进意见.最后,以1998年深圳附近海域发生的事故为例进行分类、统计,找出事故发生的内在规律,并提出改进措施.     

深化海事调查全面与国际接轨

国际上现有的海事调查的发展方向是调查事故发生的内在原因，注重人为因素的调查，从更基础的层面去调查事故，找出事故发生的根本原因，对于一起事故的发生要从SHEL模型涉及的各个层面进行深入的调查，从而真正找出事故发生的原因，总结出经验教训，避免事故的再次发生。     

双体水翼船水翼连接结构分析

本文从结构静力响应出发，将双体水翼船水翼及支柱简化成力学模型，用有限元法计算水翼及支柱的应力，校核其强度及稳定性，并给出了水翼、船体与支柱的连接形式。