Pub Date : 2008-12-01DOI: 10.1109/KAMW.2008.4810710
Jiao Peigang, Zhou Yiqi, Li Zirui, Chen Lei
Two-phase flow problems are presented using the method of smoothed particle hydrodynamics (SPH). The combination of meshless and lagrangian nature inherent in the SPH method offers the advantages in treating large deformations, large inhomogeneities and tracing interfaces in the two-phase flow process. Two cases are solved using a SPH code developed at ACES. It is found that major physics of the two-phase flow such as shape and location can be well captured in the simulation. Two-phase SPH method presented in this paper can be easily extended to deal with many other problems of two-phase flow if simulation control parameters such as input condition, boundary condition and corresponding equation of state etc. are defined properly.
{"title":"Simulation of Two-phase Flow Using Smoothed Particle Hydrodynamics","authors":"Jiao Peigang, Zhou Yiqi, Li Zirui, Chen Lei","doi":"10.1109/KAMW.2008.4810710","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810710","url":null,"abstract":"Two-phase flow problems are presented using the method of smoothed particle hydrodynamics (SPH). The combination of meshless and lagrangian nature inherent in the SPH method offers the advantages in treating large deformations, large inhomogeneities and tracing interfaces in the two-phase flow process. Two cases are solved using a SPH code developed at ACES. It is found that major physics of the two-phase flow such as shape and location can be well captured in the simulation. Two-phase SPH method presented in this paper can be easily extended to deal with many other problems of two-phase flow if simulation control parameters such as input condition, boundary condition and corresponding equation of state etc. are defined properly.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133613411","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810452
Yan Hui, Laiyongbo
In the paper we analyze the effects of different color spaces to color image dither impact and processing velocity and know that dither processing in RGB space is better judging by quality and velocity of image. A multidimensional element algorithmic method named looking-up table is proposed to make the color matching processing velocity heighten more than one amount degree. So that the required time of image processing is saved. With distances reciprocal as standard, we assign error to four points to make error assign better proportioned.
{"title":"Research of Color Image Error Diffusion Method with a New Matching Method","authors":"Yan Hui, Laiyongbo","doi":"10.1109/KAMW.2008.4810452","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810452","url":null,"abstract":"In the paper we analyze the effects of different color spaces to color image dither impact and processing velocity and know that dither processing in RGB space is better judging by quality and velocity of image. A multidimensional element algorithmic method named looking-up table is proposed to make the color matching processing velocity heighten more than one amount degree. So that the required time of image processing is saved. With distances reciprocal as standard, we assign error to four points to make error assign better proportioned.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132982902","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810671
Yi Wen-de, Huang Ai-hua
Both of temporal dependence and contemporaneous dependence are primary dependence relationship of time series vector. In economic and financial applications, one is often interested in estimating or forecasting certain characteristics of a time series given known conditions. Considering both classes of dependence and constructing conditional dependence model of bivariate Markov time series of order 1. Based on this conditional model, the moment and quantile functions of bivariate vector and univariate series are studied and a simulating way for the q th conditional quantile of bivariate vector is proposed. They are useful of measure of portfolio risk in the risk management.
{"title":"Study on the Moment and Quantile Functions of Conditional Model of Bivariate Markov Time Series of Order 1","authors":"Yi Wen-de, Huang Ai-hua","doi":"10.1109/KAMW.2008.4810671","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810671","url":null,"abstract":"Both of temporal dependence and contemporaneous dependence are primary dependence relationship of time series vector. In economic and financial applications, one is often interested in estimating or forecasting certain characteristics of a time series given known conditions. Considering both classes of dependence and constructing conditional dependence model of bivariate Markov time series of order 1. Based on this conditional model, the moment and quantile functions of bivariate vector and univariate series are studied and a simulating way for the q th conditional quantile of bivariate vector is proposed. They are useful of measure of portfolio risk in the risk management.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121610018","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810459
Fan Tiesheng, Xu Weihong, Wang Qingsong, Dou Chunyi, Luo YunShan
On the basis of analyzing the existing progressive mesh (PM) methods, this paper proposes a new structure of a mesh to simplify information record and a new progressive mesh generating algorithm based on edge-collapsed mesh simplification method. In this algorithm, the ambiguous problem in PM technology is solved, and the speed of generating progressive meshes is improved largely.
{"title":"An Algorithm of Fast Generating Reversible Progressive Meshes","authors":"Fan Tiesheng, Xu Weihong, Wang Qingsong, Dou Chunyi, Luo YunShan","doi":"10.1109/KAMW.2008.4810459","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810459","url":null,"abstract":"On the basis of analyzing the existing progressive mesh (PM) methods, this paper proposes a new structure of a mesh to simplify information record and a new progressive mesh generating algorithm based on edge-collapsed mesh simplification method. In this algorithm, the ambiguous problem in PM technology is solved, and the speed of generating progressive meshes is improved largely.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116552127","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810537
Xiong-qing Peng, Zheng Wu, Yang Yu, Xia Zhang
At present, isolated and single network security system can no longer meet the objective needs. As a new type of network, trusted network can make up many of the traditional network security flaws. Based on the analysis of the background and motivation of trusted network, the article discussed the concept and basic properties. It analyzed the architecture of trusted network and the functions of its composition. Finally, the article discussed one of models of the trusted network management platform and described its functions.
{"title":"Study on the Architecture and Management Platform Model of Trusted Network","authors":"Xiong-qing Peng, Zheng Wu, Yang Yu, Xia Zhang","doi":"10.1109/KAMW.2008.4810537","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810537","url":null,"abstract":"At present, isolated and single network security system can no longer meet the objective needs. As a new type of network, trusted network can make up many of the traditional network security flaws. Based on the analysis of the background and motivation of trusted network, the article discussed the concept and basic properties. It analyzed the architecture of trusted network and the functions of its composition. Finally, the article discussed one of models of the trusted network management platform and described its functions.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121175560","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 : 2008-12-01DOI: 10.1109/ICIEA.2009.5138770
Shuai-Tian He, C. Du
In this paper, the guaranteed cost control with adjustable parameters for linear time-delay systems is studied. Firstly, the guaranteed cost controller with adjustable parameters is designed, and the sufficient condition for the controller existing is given in the form of LMI. And then, by designing the adaptive law of adjustable parameter, the adaptive guaranteed cost control is discussed. When adjustable parameters take different values, the guaranteed cost value and the feedback gains are also different. Different feed-back gains lead to different dynamic performance of closed-loop systems, therefore, the dynamic performance of closed-loop systems can be optimized and the guaranteed cost value can be reduced by choosing proper adjustable parameters. By designing adaptive law of the adjustable parameter, and introducing it into the stability conditions of closed-loop systems, the feedback gains which change with time are gotten. Compared with the results by fixed feedback gains, the proposed method leads to less conservatism. Simulation example is given to show the effectiveness of the proposed approach.
{"title":"Adaptive Guaranteed Cost Control for Time-delay Systems","authors":"Shuai-Tian He, C. Du","doi":"10.1109/ICIEA.2009.5138770","DOIUrl":"https://doi.org/10.1109/ICIEA.2009.5138770","url":null,"abstract":"In this paper, the guaranteed cost control with adjustable parameters for linear time-delay systems is studied. Firstly, the guaranteed cost controller with adjustable parameters is designed, and the sufficient condition for the controller existing is given in the form of LMI. And then, by designing the adaptive law of adjustable parameter, the adaptive guaranteed cost control is discussed. When adjustable parameters take different values, the guaranteed cost value and the feedback gains are also different. Different feed-back gains lead to different dynamic performance of closed-loop systems, therefore, the dynamic performance of closed-loop systems can be optimized and the guaranteed cost value can be reduced by choosing proper adjustable parameters. By designing adaptive law of the adjustable parameter, and introducing it into the stability conditions of closed-loop systems, the feedback gains which change with time are gotten. Compared with the results by fixed feedback gains, the proposed method leads to less conservatism. Simulation example is given to show the effectiveness of the proposed approach.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121510983","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810573
Xu Liu, Zong-ze Xu
Structure constrained parallel factor (PARAFAC) model, which combines the structural property of communication signal with the PARAFAC analysis, was presented in this paper. The uniqueness property of the model was discussed and developed. Structure constrained trilinear alternative least square (SCTALS) algorithm was proposed to fit the constrained model. Simulation results showed that, compared to the normal PARAFAC model, the structure constrained PARAFAC was more suitable to describe communication signal. The blind signal processing algorithm based on the constrained model had better fitting performance, and still worked well in some conditions where the normal PARAFAC-based algorithm failed.
{"title":"Structure Constrained PARAFAC Model with Application to Signal Processing","authors":"Xu Liu, Zong-ze Xu","doi":"10.1109/KAMW.2008.4810573","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810573","url":null,"abstract":"Structure constrained parallel factor (PARAFAC) model, which combines the structural property of communication signal with the PARAFAC analysis, was presented in this paper. The uniqueness property of the model was discussed and developed. Structure constrained trilinear alternative least square (SCTALS) algorithm was proposed to fit the constrained model. Simulation results showed that, compared to the normal PARAFAC model, the structure constrained PARAFAC was more suitable to describe communication signal. The blind signal processing algorithm based on the constrained model had better fitting performance, and still worked well in some conditions where the normal PARAFAC-based algorithm failed.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121972141","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810689
Xiaosheng Liu, Bo Zhou
This paper firstly inquired the categories of knowledge on dam safety monitoring expert system and the knowledge acquisition process. Secondly, it not only analyzed knowledge representation about dam safety monitoring expert system, that is, factual knowledge, rule knowledge and procedure knowledge, but also established a simple knowledge base based on relational database for dam safety monitoring expert system including fact base, rule base and knowledge inference strategies. Finally, knowledge base can be applied to dam safety monitoring expert system for providing the dam safety monitoring working with a guarantee.
{"title":"Research on Knowledge Base of Dam Safety Monitoring Expert System Based on Relational Database","authors":"Xiaosheng Liu, Bo Zhou","doi":"10.1109/KAMW.2008.4810689","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810689","url":null,"abstract":"This paper firstly inquired the categories of knowledge on dam safety monitoring expert system and the knowledge acquisition process. Secondly, it not only analyzed knowledge representation about dam safety monitoring expert system, that is, factual knowledge, rule knowledge and procedure knowledge, but also established a simple knowledge base based on relational database for dam safety monitoring expert system including fact base, rule base and knowledge inference strategies. Finally, knowledge base can be applied to dam safety monitoring expert system for providing the dam safety monitoring working with a guarantee.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125127115","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810482
Biao Huang, Peng Yang
As a new theory for studying non-linear complex systems, fractal geometry has received much attention recently. Based on the relationship between length of curve and change of scale as well as the idea that a closed curve is formed by a certain amount of unclosed curves, we present an improved Douglas-Peuker method (IDPM) based algorithm. Our algorithm can not only keep the shape and details of the closed curve but also take advantage of the research achievements of the unclosed curves. In addition, it simplifies the operation and reduces the preserved points while rebuilding boundary of graph.
{"title":"A Method for Rebuilding Closed Curve Based on Fractal","authors":"Biao Huang, Peng Yang","doi":"10.1109/KAMW.2008.4810482","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810482","url":null,"abstract":"As a new theory for studying non-linear complex systems, fractal geometry has received much attention recently. Based on the relationship between length of curve and change of scale as well as the idea that a closed curve is formed by a certain amount of unclosed curves, we present an improved Douglas-Peuker method (IDPM) based algorithm. Our algorithm can not only keep the shape and details of the closed curve but also take advantage of the research achievements of the unclosed curves. In addition, it simplifies the operation and reduces the preserved points while rebuilding boundary of graph.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122276856","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 : 2008-12-01DOI: 10.1109/KAMW.2008.4810408
N. Zhang, Xueyan Zhang, Li Zhang, Zhongqiang Chen
In some cases chaos is equal to instability, which means a tiny disturbance of the initial value to a system will brings a big change in the outcome of the system. Scoring models from credit system also has chaos phenomenon which leads to a paradox that similar people take so different treatment that we can not accept. This paper describes chaos that happens in the credit system and gives an example to explain it.
{"title":"Chaos in the Scoring Models from the Credit System","authors":"N. Zhang, Xueyan Zhang, Li Zhang, Zhongqiang Chen","doi":"10.1109/KAMW.2008.4810408","DOIUrl":"https://doi.org/10.1109/KAMW.2008.4810408","url":null,"abstract":"In some cases chaos is equal to instability, which means a tiny disturbance of the initial value to a system will brings a big change in the outcome of the system. Scoring models from credit system also has chaos phenomenon which leads to a paradox that similar people take so different treatment that we can not accept. This paper describes chaos that happens in the credit system and gives an example to explain it.","PeriodicalId":375613,"journal":{"name":"2008 IEEE International Symposium on Knowledge Acquisition and Modeling Workshop","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122749076","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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