Yunhua Wu, Xibin Cao, Y. Xing, Pengfei Zheng, Shijie Zhang
The formation relative motion control by using one body fixed thruster and reaction wheels is a challenging problem due to the coupled translational and rotational dynamics. As the thruster vector depends on the current attitude and its angular velocity, and some of the attitude constraints also couple the position and attitude of the spacecraft, it makes the formation control problem high dimensional. This paper develops two decoupling conditions, including thrust vector maneuverability condition and included angle condition between the thruster and the star camera boresight, and then presents two methods to calculate the target attitude quaternion. Both of the two methods need first design the optimal trajectory of the thrust vector, and then use geometric and nonlinear programming methods to calculate the attitude trajectory. The validity of the proposed approach is demonstrated in a typical application of a dualspacecraft formation initialization.
{"title":"Relative Motion Decoupled Control for Spacecraft Formation with Coupled Translational and Rotational Dynamics","authors":"Yunhua Wu, Xibin Cao, Y. Xing, Pengfei Zheng, Shijie Zhang","doi":"10.1109/ICCMS.2009.12","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.12","url":null,"abstract":"The formation relative motion control by using one body fixed thruster and reaction wheels is a challenging problem due to the coupled translational and rotational dynamics. As the thruster vector depends on the current attitude and its angular velocity, and some of the attitude constraints also couple the position and attitude of the spacecraft, it makes the formation control problem high dimensional. This paper develops two decoupling conditions, including thrust vector maneuverability condition and included angle condition between the thruster and the star camera boresight, and then presents two methods to calculate the target attitude quaternion. Both of the two methods need first design the optimal trajectory of the thrust vector, and then use geometric and nonlinear programming methods to calculate the attitude trajectory. The validity of the proposed approach is demonstrated in a typical application of a dualspacecraft formation initialization.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126204431","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}
Simulation is an important step during the design of control systems. Based on the series tools of MATLABSimulinkxPC, the real-time simulation environment is constructed. By adopting the mixed modeling measures that comprise Simulink, Stateflow and S-function, models for satellite attitude dynamics, all sensors and actuators, control logics of the antenna and etc are all built successfully, then the modes selecting, scheduling and interfaces communication are realized effectively. The tracking and data relay satellite (TDRS) simulator is designed. It simplifies the experiment system. The turn table is eliminated and the experiment system can also reflect the effect of the attitude movement acting on the antenna pointing by using the TDRS simulator. The experiment results indicate that the experiment system can verify the antenna acquiring and tracking processes and is beneficial to the design of the user satellite’s antenna pointing control system for engineers.
{"title":"Semi-physical Simulation Research of the Antenna Acquiring and Tracking System without Turn Tables","authors":"Zhai Kun, Baoyin Hexi, Qu Xi","doi":"10.1109/ICCMS.2009.48","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.48","url":null,"abstract":"Simulation is an important step during the design of control systems. Based on the series tools of MATLABSimulinkxPC, the real-time simulation environment is constructed. By adopting the mixed modeling measures that comprise Simulink, Stateflow and S-function, models for satellite attitude dynamics, all sensors and actuators, control logics of the antenna and etc are all built successfully, then the modes selecting, scheduling and interfaces communication are realized effectively. The tracking and data relay satellite (TDRS) simulator is designed. It simplifies the experiment system. The turn table is eliminated and the experiment system can also reflect the effect of the attitude movement acting on the antenna pointing by using the TDRS simulator. The experiment results indicate that the experiment system can verify the antenna acquiring and tracking processes and is beneficial to the design of the user satellite’s antenna pointing control system for engineers.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130910132","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}
In this paper we study the asymptotic behavior of global solutions to the initial boundary value problem for semilinear Petrovsky equation with nonlinear damping and source terms by using a difference inequality.
{"title":"Asymptotic Behavior of Global Solutions for a System of Petrovsky","authors":"Y. Ye, W. Zhu, Xiaoyan Zhou","doi":"10.1109/ICCMS.2009.78","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.78","url":null,"abstract":"In this paper we study the asymptotic behavior of global solutions to the initial boundary value problem for semilinear Petrovsky equation with nonlinear damping and source terms by using a difference inequality.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123911183","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}
As one of the most common network attacks, Denial of service (DoS) usually uses reasonable service requests to take excessive computing and network resources, thus causes the legitimate users to be unable to obtain the service responses. But now little research has performed within the area. This aim of the paper is to develop a double layers detection system for DoS based on the DCs (Dendritic Cells) – T cells interaction mechanism of the Danger Theory in immunology. DCs fuse the multiple signals and present the correlated antigens to T cells, and T cells are responsible for the detection for the structure of the antigens. A large number of semi-connections can be viewed as antigens and the corresponding behavior information of the system and network triggered by these semi-connections can be viewed as signals. The theoretic analysis shows that the method of DCs emphasizing the detection of the signals and T cell emphasizing the detection of the corresponding antigens has a good prospect in the application of DoS detection.
拒绝服务攻击(Denial of service, DoS)是一种最常见的网络攻击，通常利用合理的服务请求占用大量的计算资源和网络资源，导致合法用户无法获得服务响应。但目前在这一领域进行的研究很少。基于免疫学危险理论中的dc(树突状细胞)- T细胞相互作用机制，开发DoS双层检测系统。dc融合多种信号并将相关抗原呈递给T细胞，T细胞负责检测抗原的结构。大量的半连接可以看作抗原，这些半连接所触发的系统和网络相应的行为信息可以看作信号。理论分析表明，dc强调信号检测，T细胞强调相应抗原检测的方法在DoS检测中具有良好的应用前景。
{"title":"A Double Layers Detection for DoS Based on the Danger Theory","authors":"Junmin Zhang, Yiwen Liang","doi":"10.1109/ICCMS.2009.63","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.63","url":null,"abstract":"As one of the most common network attacks, Denial of service (DoS) usually uses reasonable service requests to take excessive computing and network resources, thus causes the legitimate users to be unable to obtain the service responses. But now little research has performed within the area. This aim of the paper is to develop a double layers detection system for DoS based on the DCs (Dendritic Cells) – T cells interaction mechanism of the Danger Theory in immunology. DCs fuse the multiple signals and present the correlated antigens to T cells, and T cells are responsible for the detection for the structure of the antigens. A large number of semi-connections can be viewed as antigens and the corresponding behavior information of the system and network triggered by these semi-connections can be viewed as signals. The theoretic analysis shows that the method of DCs emphasizing the detection of the signals and T cell emphasizing the detection of the corresponding antigens has a good prospect in the application of DoS detection.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128773642","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}
This paper analyzed data features and configuration characteristics of digital mine [1], researched on its structure and system framework, discussed the principle and designed concept of the remote data services and data exchange, then built on the remote visualization model of digital mine information, used SVG[2] to describe structure data and real time data of monitoring based on plug-in technology, and then published it by Web modal, so that realized remote visualization of digital mine information. This remote visualization system had a strong structural flexibility, maintainability, expandability, and it had widely applied and played an important role in the "digital mine" process.
{"title":"Research on SVG-based Remote Visualization System of Digital Mine Information","authors":"Y. Wang, D. Ma","doi":"10.1109/ICCMS.2009.36","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.36","url":null,"abstract":"This paper analyzed data features and configuration characteristics of digital mine [1], researched on its structure and system framework, discussed the principle and designed concept of the remote data services and data exchange, then built on the remote visualization model of digital mine information, used SVG[2] to describe structure data and real time data of monitoring based on plug-in technology, and then published it by Web modal, so that realized remote visualization of digital mine information. This remote visualization system had a strong structural flexibility, maintainability, expandability, and it had widely applied and played an important role in the \"digital mine\" process.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127749120","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}
In this paper, analysis and simulations of splitting and merging self-similar traffic are done on a router/switch which uses prioritized VOQs (Virtual Output Queue) as its input queues and crossbar as its switch fabric. The results of the simulations say that merge traffic with the same Hurst values (no matter what the data rate is) will not change the Hurst value of merged traffic, but merge traffic with different Hurst values (short-range dependent traffic can be considered as the case in which its Hurst value equals 0.5) will result in a traffic whose Hurst value is no more than the maximum and no less than the minimum. Also the splitting of traffic will have a great influence on resulting traffic, even the degree of LRD (Long-Range dependence) is very high in the original traffic, after being split twice at VOQs and priority queues, the degree of LRD is greatly decreased.
{"title":"Simulation of Self-Similar Traffic in Switches Using Crossbar and Prioritized VOQs","authors":"Xia Yu, Zhuang Juhua","doi":"10.1109/ICCMS.2009.17","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.17","url":null,"abstract":"In this paper, analysis and simulations of splitting and merging self-similar traffic are done on a router/switch which uses prioritized VOQs (Virtual Output Queue) as its input queues and crossbar as its switch fabric. The results of the simulations say that merge traffic with the same Hurst values (no matter what the data rate is) will not change the Hurst value of merged traffic, but merge traffic with different Hurst values (short-range dependent traffic can be considered as the case in which its Hurst value equals 0.5) will result in a traffic whose Hurst value is no more than the maximum and no less than the minimum. Also the splitting of traffic will have a great influence on resulting traffic, even the degree of LRD (Long-Range dependence) is very high in the original traffic, after being split twice at VOQs and priority queues, the degree of LRD is greatly decreased.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131616013","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}
Zhiqiang Xie, Y. Liu, Shuzhen Hao, Guangyu Tan, F. Wang
Aiming at the problem that the machine is single and some machine has effect on the processing efficiency in complex product dynamic scheduling, based on the conceptions of bottleneck device classification and increasable bottleneck device, an algorithm which can confirm the increasable bottleneck device is put forward by calculating the total time of parallel operations and by analyzing the number of immediate predecessors. Calculating the total time of parallel operations for a device can confirm the shrinkable times of increasing this device. When devices have the same total time of parallel operations, choosing the device which has the most number of immediate predecessors can make more operations be processed as soon as possible. The verification and comparison of example show that the aim of improving the production efficiency is achieved by adding the increasable bottleneck device. The algorithm is simple and it can confirm the increasable bottleneck device quickly in complex product dynamic scheduling.
{"title":"Notice of RetractionStudy on Confirming Increasable Bottleneck Device in Complex Product Dynamic Scheduling","authors":"Zhiqiang Xie, Y. Liu, Shuzhen Hao, Guangyu Tan, F. Wang","doi":"10.1109/ICCMS.2009.24","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.24","url":null,"abstract":"Aiming at the problem that the machine is single and some machine has effect on the processing efficiency in complex product dynamic scheduling, based on the conceptions of bottleneck device classification and increasable bottleneck device, an algorithm which can confirm the increasable bottleneck device is put forward by calculating the total time of parallel operations and by analyzing the number of immediate predecessors. Calculating the total time of parallel operations for a device can confirm the shrinkable times of increasing this device. When devices have the same total time of parallel operations, choosing the device which has the most number of immediate predecessors can make more operations be processed as soon as possible. The verification and comparison of example show that the aim of improving the production efficiency is achieved by adding the increasable bottleneck device. The algorithm is simple and it can confirm the increasable bottleneck device quickly in complex product dynamic scheduling.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116378848","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}
The simulation of chemical reacting systems is one of the most challenging topics in Systems Biology, due to their complexity and inherent randomness. The Gillespie's Stochastic Simulation Algorithm (SSA) is a standard algorithm to simulate well-stirred biochemical systems, butthe computational burden makes this algorithm slow to compute for many realistic problems. Recent programmability improvements allow non-graphics applications to leverage the Graphics Processing Units'(GPUs) computational power. This paper describes practical issues arising by a parallel implementation on GPU technology, shows how to reduce the memory space required by one of the most known versions of SSA, and presents the application of the implemented algorithm to a test model.
{"title":"Optimized Parallel Implementation of Gillespie's First Reaction Method on Graphics Processing Units","authors":"Cristian Dittamo, Davide Cangelosi","doi":"10.1109/ICCMS.2009.42","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.42","url":null,"abstract":"The simulation of chemical reacting systems is one of the most challenging topics in Systems Biology, due to their complexity and inherent randomness. The Gillespie's Stochastic Simulation Algorithm (SSA) is a standard algorithm to simulate well-stirred biochemical systems, butthe computational burden makes this algorithm slow to compute for many realistic problems. Recent programmability improvements allow non-graphics applications to leverage the Graphics Processing Units'(GPUs) computational power. This paper describes practical issues arising by a parallel implementation on GPU technology, shows how to reduce the memory space required by one of the most known versions of SSA, and presents the application of the implemented algorithm to a test model.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125252950","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}
With the increase in the number of motor vehicles, the speed of the car must be limited in different weather environment in order to ensure the traffic safety. According to the traffic safety problem in our country now days, 3DS MAX is used in the field of traffic simulation. This paper takes that the speed of car does not exceed 60km/h when the visibility is between 100m to 200m for example. Firstly, the car model is created with 3DS MAX, then, the simulation of car that is going is realized with MaxScript built in 3DS MAX. Experimental results show the correctness of the car’s speed limited on by 3D animation.
{"title":"Research of Traffic Safety Simulation Based on 3DS MAX","authors":"Wenbo Wang","doi":"10.1109/ICCMS.2009.49","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.49","url":null,"abstract":"With the increase in the number of motor vehicles, the speed of the car must be limited in different weather environment in order to ensure the traffic safety. According to the traffic safety problem in our country now days, 3DS MAX is used in the field of traffic simulation. This paper takes that the speed of car does not exceed 60km/h when the visibility is between 100m to 200m for example. Firstly, the car model is created with 3DS MAX, then, the simulation of car that is going is realized with MaxScript built in 3DS MAX. Experimental results show the correctness of the car’s speed limited on by 3D animation.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117011956","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}
Qingfa Chen, Ke-pin Zhou, Tengteng Long, Jian-hua Hu, Dan Wang
Taking the fragment ore section of orebody No. 105 with the high value in Gaofeng mine in Guangxi province for example, three representative kinds of goafs in all scales were selected on the basis of the differences of goaf scale, surrounding rock conditions and situ stress field, and their stability were calculated by the universal distinct element code (UDEC). The calculation results showed as follows: 1) with the increase of goaf scale, the tensile stress scope in the goaf roof expanded from 12m to 60m; 2) the tensile failure mode of joints surfaces was primary, and that of ore block was auxiliary; 3) the maximum principal stress peak could reach 40.3MPa which exceeded rock body tensile strength 38.07MPa, but the influence on goaf stability was small because the peak was far away from goaf; 4) the plastic zone in roof changed from 7m to 12m because of the increased scale, so the goaf stability became worse gradually; 5) the objective principles that the whole plastic zone distributed on the left part of goaf roof and no plastic zone in pillar provided reference for choosing proper position of filling wellhead.
{"title":"UDEC-based Stability Analysis of the Goafs in Fragment Ore Section","authors":"Qingfa Chen, Ke-pin Zhou, Tengteng Long, Jian-hua Hu, Dan Wang","doi":"10.1109/ICCMS.2009.41","DOIUrl":"https://doi.org/10.1109/ICCMS.2009.41","url":null,"abstract":"Taking the fragment ore section of orebody No. 105 with the high value in Gaofeng mine in Guangxi province for example, three representative kinds of goafs in all scales were selected on the basis of the differences of goaf scale, surrounding rock conditions and situ stress field, and their stability were calculated by the universal distinct element code (UDEC). The calculation results showed as follows: 1) with the increase of goaf scale, the tensile stress scope in the goaf roof expanded from 12m to 60m; 2) the tensile failure mode of joints surfaces was primary, and that of ore block was auxiliary; 3) the maximum principal stress peak could reach 40.3MPa which exceeded rock body tensile strength 38.07MPa, but the influence on goaf stability was small because the peak was far away from goaf; 4) the plastic zone in roof changed from 7m to 12m because of the increased scale, so the goaf stability became worse gradually; 5) the objective principles that the whole plastic zone distributed on the left part of goaf roof and no plastic zone in pillar provided reference for choosing proper position of filling wellhead.","PeriodicalId":325964,"journal":{"name":"2009 International Conference on Computer Modeling and Simulation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128959634","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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