Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5073134
Sitnov Yu, Shuxu Guo, Feng-li Gao
Based on wavelet transformation and chaos theory, low frequency noise in semiconductor laser is studied. The feasibility of chaotic noise model is discussed and prescribed in detail based on techniques of power spectrum, Lyapunov exponents and correlation dimension. And in theory, it also explains the reasons for this chaos phenomenon. The rigorous chaotic character of low-frequency noise in semiconductor laser is found, which is a theoretical basis for the correlative investigation based on semiconductor laser reliability.
{"title":"Study on Chaotic Behavior of Low-Frequency Noise in Semiconductor Laser","authors":"Sitnov Yu, Shuxu Guo, Feng-li Gao","doi":"10.1109/IWISA.2009.5073134","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5073134","url":null,"abstract":"Based on wavelet transformation and chaos theory, low frequency noise in semiconductor laser is studied. The feasibility of chaotic noise model is discussed and prescribed in detail based on techniques of power spectrum, Lyapunov exponents and correlation dimension. And in theory, it also explains the reasons for this chaos phenomenon. The rigorous chaotic character of low-frequency noise in semiconductor laser is found, which is a theoretical basis for the correlative investigation based on semiconductor laser reliability.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74326190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072752
Junhong Li, Zhennan Hong, Wusong Yang
In this paper an variable structure speed controller for induction motor(IM) is developed, which combines the merits of sliding mode variable structure theory, direct field-oriented control (DFOC) and adaptive algorithm. Firstly, a sliding mode controller is designed and the adaptive algorithm is adopted to adjust the sliding gain in order to restrain chattering. And then a sliding mode flux observer is used to observe the rotor flux accurately. All the control strategies are derived in the sense of Lyapunov stability theory so that the stable tracking performance can be guaranteed under the occurrence of system uncertainties and external disturbances. Finally, some simulation results are provided to validate the effectiveness and robustness of the proposed control scheme.
{"title":"Application of Variable Structure Theory to Direct Field-Oriented Induction Motor Speed Controllers","authors":"Junhong Li, Zhennan Hong, Wusong Yang","doi":"10.1109/IWISA.2009.5072752","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072752","url":null,"abstract":"In this paper an variable structure speed controller for induction motor(IM) is developed, which combines the merits of sliding mode variable structure theory, direct field-oriented control (DFOC) and adaptive algorithm. Firstly, a sliding mode controller is designed and the adaptive algorithm is adopted to adjust the sliding gain in order to restrain chattering. And then a sliding mode flux observer is used to observe the rotor flux accurately. All the control strategies are derived in the sense of Lyapunov stability theory so that the stable tracking performance can be guaranteed under the occurrence of system uncertainties and external disturbances. Finally, some simulation results are provided to validate the effectiveness and robustness of the proposed control scheme.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73349381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072881
Ping Li, Hongmei Gao, Xiao-ping Liu
It is difficult to establish mathematical mode for ultra-precision worktable control system, because there are several disadvantages in the system, such as varying as time, nonlinear and so on. Fuzzy control has good robustness and other advantage, such as it need not establish the mathematical mode of controlled system, but steady state precision is bad. So a new control method which combined fuzzy controller with PID controller was proposed. Because different control schemes are used in different period in whole control process, the controller has inherited character of PID control, in which there are no static error and good static stability, and character of fuzzy control, in which there are strong compatibility and good dynamic property. Simultaneously, it gets rid of the disadvantages of them. Simulation experiment for ultra precision worktable control system has been carried on by Matlab software. PID control and fuzzy-PID control have been compared. Simulation results can prove that fuzzy- PID control can achieve better results. It was an efficient control method for the ultra-precision worktable.
{"title":"Fuzzy-PID Compound Control for Ultra-Precision Worktable","authors":"Ping Li, Hongmei Gao, Xiao-ping Liu","doi":"10.1109/IWISA.2009.5072881","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072881","url":null,"abstract":"It is difficult to establish mathematical mode for ultra-precision worktable control system, because there are several disadvantages in the system, such as varying as time, nonlinear and so on. Fuzzy control has good robustness and other advantage, such as it need not establish the mathematical mode of controlled system, but steady state precision is bad. So a new control method which combined fuzzy controller with PID controller was proposed. Because different control schemes are used in different period in whole control process, the controller has inherited character of PID control, in which there are no static error and good static stability, and character of fuzzy control, in which there are strong compatibility and good dynamic property. Simultaneously, it gets rid of the disadvantages of them. Simulation experiment for ultra precision worktable control system has been carried on by Matlab software. PID control and fuzzy-PID control have been compared. Simulation results can prove that fuzzy- PID control can achieve better results. It was an efficient control method for the ultra-precision worktable.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73419240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072991
Guihua Li, Teng Huang, Minwei Jiang, Ronghua Yue
In allusion to the problems that the conventional wavelet neural network has disadvantages of training slowly, convergence to the local minimum easily and poor approximation performance, two aspects including initial parameters selection and network training methods were selected to be optimized after analyzing its approximation performance. A kind of self-adaptive method to get the number of hidden layer nodes was put forward. And the WNN model based on SCG optimization algorithm was constructed, combining with SCG algorithm and the method of setting the initial parameters based on self-correlation. The model has been used to predict the settlement of high-rise building foundation under complicated geological conditions, and the results showed that the model not only solved the problems of approximation performance very well, but also is better than both of the BP neural network and the conventional WNN based on BP algorithm.
{"title":"Optimization and Application Research of Wavelet Neural Network","authors":"Guihua Li, Teng Huang, Minwei Jiang, Ronghua Yue","doi":"10.1109/IWISA.2009.5072991","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072991","url":null,"abstract":"In allusion to the problems that the conventional wavelet neural network has disadvantages of training slowly, convergence to the local minimum easily and poor approximation performance, two aspects including initial parameters selection and network training methods were selected to be optimized after analyzing its approximation performance. A kind of self-adaptive method to get the number of hidden layer nodes was put forward. And the WNN model based on SCG optimization algorithm was constructed, combining with SCG algorithm and the method of setting the initial parameters based on self-correlation. The model has been used to predict the settlement of high-rise building foundation under complicated geological conditions, and the results showed that the model not only solved the problems of approximation performance very well, but also is better than both of the BP neural network and the conventional WNN based on BP algorithm.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73886054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072671
Nan Cui, Qingan Cui
Understanding how certain media types affect consumers' preference for foreign brands is a major concern for managers of Multinational Corporations to make better media choices in advertising campaigns. However, little research has been conducted to facilitate managers' decision. A rough set based approach to predict consumers' preference for foreign and domestic brands in their purchasing decisions is proposed. Using data collected from a large scale survey, a case study is conducted to illustrate the application and advantages of the proposed approach.
{"title":"A Rough-Set Based Approach to Predict Consumers' Brand Preference","authors":"Nan Cui, Qingan Cui","doi":"10.1109/IWISA.2009.5072671","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072671","url":null,"abstract":"Understanding how certain media types affect consumers' preference for foreign brands is a major concern for managers of Multinational Corporations to make better media choices in advertising campaigns. However, little research has been conducted to facilitate managers' decision. A rough set based approach to predict consumers' preference for foreign and domestic brands in their purchasing decisions is proposed. Using data collected from a large scale survey, a case study is conducted to illustrate the application and advantages of the proposed approach.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73910279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5073183
Q. Tang, Yong Chen, Ge Chen, Tang Qing-hui
Automated sea route design is an important part for the application of electronic chart. An elasticity algorithm based on the grid chart environmental model is brought forward to search the shortest safe sea route automatically by making full use of the adjacency of the grids. The algorithm has the advantage of good stability, briefness and high searching efficiency. The experiment results show that the method is applicable for the sea route planning of complicated large-sized sea areas.
{"title":"The Elasticity Algorithm for Automated Route Design Based on Electronic Chart","authors":"Q. Tang, Yong Chen, Ge Chen, Tang Qing-hui","doi":"10.1109/IWISA.2009.5073183","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5073183","url":null,"abstract":"Automated sea route design is an important part for the application of electronic chart. An elasticity algorithm based on the grid chart environmental model is brought forward to search the shortest safe sea route automatically by making full use of the adjacency of the grids. The algorithm has the advantage of good stability, briefness and high searching efficiency. The experiment results show that the method is applicable for the sea route planning of complicated large-sized sea areas.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84274239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072769
Xin Wan, Toshio Okamoto
We propose a learning process based approach to address the well-known implicit profiling method in group learning recommender system. Our approach makes use of likelihood control to integrate the learning step coefficient of each learner into ratings. We introduce a preference model comprising both user-user and user-item relationships in recommender systems, and present a motivating example of our work based on the model. We empirically evaluated the effectiveness of our approach, which shows that the proposed approach has a good recommendation performance in e-learning recommender system.
{"title":"Building Learner Profile for Group Learning Recommender System from Learning Process","authors":"Xin Wan, Toshio Okamoto","doi":"10.1109/IWISA.2009.5072769","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072769","url":null,"abstract":"We propose a learning process based approach to address the well-known implicit profiling method in group learning recommender system. Our approach makes use of likelihood control to integrate the learning step coefficient of each learner into ratings. We introduce a preference model comprising both user-user and user-item relationships in recommender systems, and present a motivating example of our work based on the model. We empirically evaluated the effectiveness of our approach, which shows that the proposed approach has a good recommendation performance in e-learning recommender system.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84989612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072957
Zhengping Wang, Shijun Guo
The purpose of this paper is to discuss the method of modeling and simulation software design for an aircraft of seamless aeroelastic wing. An aeroelastic wing structure model is established, and then a flight control model is linearized by small disturbance method. The characteristic for aeroelastic wing aerodynamic force varying with the flight speed and the control surface deflection is analyzed through some numerical calculation curves. The analyzing results show that the main challenge is how to achieve a specified rolling rate for the aircraft when the control effectiveness drops down within the flight envelope. In order to resolve this problem, the simulation software integrated dynamics force calculating and control system design is developed and a PID control law is designed. The simulation results show that the control plans are feasible to meet the requirement for rolling control of aeroelastic wing aircraft designed by this paper.
{"title":"Modeling and Simulation for an Aircraft of Seamless Aeroelastic Wing","authors":"Zhengping Wang, Shijun Guo","doi":"10.1109/IWISA.2009.5072957","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072957","url":null,"abstract":"The purpose of this paper is to discuss the method of modeling and simulation software design for an aircraft of seamless aeroelastic wing. An aeroelastic wing structure model is established, and then a flight control model is linearized by small disturbance method. The characteristic for aeroelastic wing aerodynamic force varying with the flight speed and the control surface deflection is analyzed through some numerical calculation curves. The analyzing results show that the main challenge is how to achieve a specified rolling rate for the aircraft when the control effectiveness drops down within the flight envelope. In order to resolve this problem, the simulation software integrated dynamics force calculating and control system design is developed and a PID control law is designed. The simulation results show that the control plans are feasible to meet the requirement for rolling control of aeroelastic wing aircraft designed by this paper.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79431701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072732
Dongwu Liu, Zhiwei Chen
Soil contamination with heavy metals will lead to losses in agricultural yield and hazardous health effects as they enter into the food chain. The lead contamination exerts a wide range of adverse effects on growth and metabolism of plants. In present studies, we investigated the effect of lead on chlorophyll fluorescence of wheat leaves with confocal microscope. The digital images of chlorophyll in the wheat leaves were acquired with a computer linked to confocal microscope. Then the fluorescence intensity of chlorophyll was quantified with confocal software. The results showed that the fluorescence intensity of chlorophyll was higher than the control at 100 and 500 Pb mg kg -1 DW soil on fourteenth and twenty-first days. However, the fluorescence intensity of chlorophyll was lower than the control at 2000 Pb mg kg -1 DW soil on fourteenth and twenty-first days. On twenty-eighth day, the fluorescence intensity of chlorophyll was higher than the control at 100 Pb mg kg -1 DW soil, but the fluorescence intensity of chlorophyll was lower than the control at 500 and 1000 Pb mg kg -1 DW soil. Moreover, we established a method to analysis the effects of heavy metals on chlorophyll fluorescence with the digital images of confocal microscope, which is an easy and simple job.
土壤重金属污染进入食物链后将导致农业产量损失和有害健康影响。铅污染对植物的生长和代谢具有广泛的不利影响。本研究利用共聚焦显微镜研究了铅对小麦叶片叶绿素荧光的影响。利用共聚焦显微镜连接的计算机获取小麦叶片叶绿素的数字图像。然后用共聚焦软件定量叶绿素的荧光强度。结果表明，在100和500 Pb mg kg -1 DW土壤中，第14天和第21天叶绿素荧光强度均高于对照。在2000 Pb mg kg -1 DW土壤中，第14天和第21天叶绿素荧光强度低于对照。第28天，100 Pb mg kg -1 DW土壤下叶绿素荧光强度高于对照，500和1000 Pb mg kg -1 DW土壤下叶绿素荧光强度低于对照。此外，我们还建立了一种利用共聚焦显微镜数字图像分析重金属对叶绿素荧光影响的方法，该方法简便易行。
{"title":"Analysis Effects of Lead on Chlorophyll Fluorescence of Wheat Leaves with Confocal Software","authors":"Dongwu Liu, Zhiwei Chen","doi":"10.1109/IWISA.2009.5072732","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072732","url":null,"abstract":"Soil contamination with heavy metals will lead to losses in agricultural yield and hazardous health effects as they enter into the food chain. The lead contamination exerts a wide range of adverse effects on growth and metabolism of plants. In present studies, we investigated the effect of lead on chlorophyll fluorescence of wheat leaves with confocal microscope. The digital images of chlorophyll in the wheat leaves were acquired with a computer linked to confocal microscope. Then the fluorescence intensity of chlorophyll was quantified with confocal software. The results showed that the fluorescence intensity of chlorophyll was higher than the control at 100 and 500 Pb mg kg\u0000 -1\u0000 DW soil on fourteenth and twenty-first days. However, the fluorescence intensity of chlorophyll was lower than the control at 2000 Pb mg kg\u0000 -1\u0000 DW soil on fourteenth and twenty-first days. On twenty-eighth day, the fluorescence intensity of chlorophyll was higher than the control at 100 Pb mg kg\u0000 -1\u0000 DW soil, but the fluorescence intensity of chlorophyll was lower than the control at 500 and 1000 Pb mg kg\u0000 -1\u0000 DW soil. Moreover, we established a method to analysis the effects of heavy metals on chlorophyll fluorescence with the digital images of confocal microscope, which is an easy and simple job.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79677691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-23DOI: 10.1109/IWISA.2009.5072787
Hong-bin Zhang, Zhi-xin Jia
For the complex system, there are many influencing factors of the reliability, and apart of the factors can only be assessed qualitatively. Furthermore, the complex system is composed by different type sub-systems. So it is difficult to allocate the reliability of system to every subsystem by traditional reliability allocation method. So, a new reliability allocation method which based on the fuzzy decision is proposed. The basic idea and the steps are introduced. And the formula for calculating the reliability of sub-system is defined. At last, an example is calculated by this method. It is proved that the result is accord with the principles of reliability allocation completely.
{"title":"Complex System Reliability Allocation Based on Fuzzy Decision Method","authors":"Hong-bin Zhang, Zhi-xin Jia","doi":"10.1109/IWISA.2009.5072787","DOIUrl":"https://doi.org/10.1109/IWISA.2009.5072787","url":null,"abstract":"For the complex system, there are many influencing factors of the reliability, and apart of the factors can only be assessed qualitatively. Furthermore, the complex system is composed by different type sub-systems. So it is difficult to allocate the reliability of system to every subsystem by traditional reliability allocation method. So, a new reliability allocation method which based on the fuzzy decision is proposed. The basic idea and the steps are introduced. And the formula for calculating the reliability of sub-system is defined. At last, an example is calculated by this method. It is proved that the result is accord with the principles of reliability allocation completely.","PeriodicalId":6327,"journal":{"name":"2009 International Workshop on Intelligent Systems and Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79758477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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