作者机构：
[Zhennan H.; Ting L.] School of Electrical Engineering, University of South China, Hengyang, 421 001, China;[Tizheng X.; Zhiyong L.] Zhuhai Hr Information Technology Co. Ltd., Zhuhai, 519080, China
通讯机构：
[Tizheng, X.] Z;Zhuhai Hr Information Technology Co. Ltd.China
关键词：
增量学习;入侵检测;单类支持向量机;信息安全
摘要：
工业控制系统入侵检测是工业网络中的一个难点问题,存在着系统建立速度慢、模型更新代价高和扩展性差等不足,因此提出一种基于增量单类支持向量机(one-class support vector machine,OCSVM)的工业控制系统入侵检测方法.根据正常Modbus /TCP数据信息,利用OCSVM算法学习正常行为的通信模式.随着新样本的持续增加,为了提高学习速度,进一步利用临近分类间隔和KKT条件对当前训练样本集进行约减,约减后的训练样本再次进行快速增量OCSVM训练.经过实验结果分析,证明了该方法在保持较高分类精度的同时提高了入侵检测系统的增量学习速度.
期刊：
International Journal of Applied Mathematics & Statistics,2013年41(11):246-254 ISSN：0973-1377
通讯作者：
Zhao, Y.
作者机构：
[Zhao, Yuhong; Hong, Zhennan] School of Electric Engineering, University of south China, Hengyang, 421001, Hunan, China;[Hu, Heping] School of Mathematics and Physics, University of south China, Hengyang, 421001, Hunan, China
通讯机构：
[Zhao, Y.] S;School of Electric Engineering, , Hengyang, 421001, Hunan, China
摘要：
The roundness and surface roughness are important quality performances for machined round parts. In order to get the best quality performance by less experiment search for optimum parameters, an orthogonal array was used for the experimental design, optimal machining parameters were determined by the grey relational grade obtained from the grey relational analysis, and the main machining parameters that affect the machining performance can be found by the difference between the maximum and minimum value of the grey relational grade of the machining parameters. Experimental results have shown that the roundness and surface roughness of machined round parts can be improved effectively by the proposed approach.
作者机构：
[盛义发; 桂卫华; 喻寿益] School of Information Science and Engineering, Central South University, Changsha 410083, China;[盛义发; 洪镇南] School of Electrical Engineering, University of South China, Hengyang 421001, China
通讯机构：
School of Information Science and Engineering, Central South University, China
摘要：
The roundness and surface roughness are important quality performances for machined round parts. In order to get the best quality performance by less experiment search for optimum parameters, an orthogonal array was used for the experimental design, optimal machining parameters were determined by the grey relational grade obtained from the grey relational analysis, and the main machining parameters that affect the machining performance can be found by the difference between the maximum and minimum value of the grey relational grade of the machining parameters. Experimental results have shown that the roundness and surface roughness of machined round parts can be improved effectively by the proposed approach.
作者机构：
[盛义发; 桂卫华; 喻寿益] Institute of Information Science and Engineering, Central South University, Changsha 410083, Hunan Province, China;[洪镇南] School of Electrical Engineering, University of South China, Hengyang 421001, Hunan Province, China
通讯机构：
Institute of Information Science and Engineering, Central South University, China
摘要：
The interior permanent magnet synchronous motor (IPMSM) can make use of the magnetoresistive effect to improve its efficiency and speed characteristics, so that it is suited to railway vehicle. To solve electromagnetic torque output insufficient of IPMSM using the traditional field weakening control method, the field weakening control strategy of interior permanent magnet synchronous motor for railway vehicle was studied in the paper. A novel method of modifying the current reference and field weakening based on the maximum electromagnetic torque at full speed (whether in the base rate areas or in the field weakening region) were proposed. The method consists of two parts, one is the determination of the field weakening region, and another is the current reference modification. The field weakening region was determined. The reference current vector and the maximum electromagnetic torque expression were obtained by solving the voltage limit equations and the current limit equations in the field weakening region I; the reference current vector was obtained by solving the voltage limit equations and the electromagnetic torque equations in the field weakening region II. The current reference was modified by the field weakening direction and the magnitude of the voltage error according to the field weakening region. The simulink model was founded by Matlab and the experiment platform of the 100 kW IPMSM field weakening control system was implemented using a TMS320LF2407A DSP. The validity of the proposed strategy was proved by the simulation and experimental results.
