The Experts below are selected from a list of 21903 Experts worldwide ranked by ideXlab platform
Kang G Shin - One of the best experts on this subject based on the ideXlab platform.
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IEEE Real-Time and Embedded Technology and Applications Symposium - On Dynamic Reconfiguration of a Large-Scale Battery System
2009 15th IEEE Real-Time and Embedded Technology and Applications Symposium, 2009Co-Authors: Kang G ShinAbstract:Electric vehicles powered with large-scale battery packs are gaining popularity as gasoline price soars. Large-scale battery packs usually consist of an estimated 12,000 battery cells connected in series and parallel, which are susceptible to battery-cell failures. Unfortunately, current battery-management systems are unable to handlethe inevitable battery-cell failures very well. To address this problem, we propose a Dynamic Reconfiguration framework that monitors, reconfigures, and controls large-scale battery packs online. The framework is built upon a syntactic bypassing mechanism that provides a set of rules for changing the battery-pack configuration, and a semantic bypassing mechanism by which the battery-cell connectivity is reconfigured to recover from a battery-cell failure. In particular, the semantic bypassing mechanism is dictated by constant-voltage-keeping and Dynamic-voltage-allowing policies. The former policy is effective in preventing unavoidable voltage drops during the battery discharge, while the latter policy is effective in supplying different amounts of power to meet a wide-range of application requirements. Our experimental evaluation has shown the proposed framework to enable the battery packs to be 9 times as fault-tolerant as a legacy scheme.
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On Dynamic Reconfiguration of a large-scale battery system
Proceedings of the IEEE Real-Time and Embedded Technology and Applications Symposium, RTAS, 2009Co-Authors: Hahnsang Kim, Kang G ShinAbstract:Electric vehicles powered with large-scale battery packs are gaining popularity as gasoline price soars. Large-scale battery packs usually consist of an estimated 12,000 battery cells connected in series and parallel, which are susceptible to battery-cell failures. Unfortunately, current battery-management systems are unable to handle the inevitable battery-cell failures very well. To address this problem, we propose a Dynamic Reconfiguration framework that monitors, reconfigures, and controls large-scale battery packs online. The framework is built upon a syntactic bypassing mechanism that provides a set of rules for changing the battery-pack configuration, and a semantic bypassing mechanism by which the battery-cell connectivity is reconfigured to recover from a battery-cell failure. In particular, the semantic bypassing mechanism is dictated by constant-voltage-keeping and Dynamic-voltage-allowing policies. The former policy is effective in preventing unavoidable voltage drops during the battery discharge, while the latter policy is effective in supplying different amounts of power to meet a wide-range of application requirements. Our experimental evaluation has shown the proposed framework to enable the battery packs to be 9 times as fault-tolerant as a legacy scheme.
Alexander L Wolf - One of the best experts on this subject based on the ideXlab platform.
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Deployment and Dynamic Reconfiguration planning for distributed software systems
Software Quality Journal, 2007Co-Authors: Naveed Arshad, Dennis Heimbigner, Alexander L WolfAbstract:The quality of software systems are determined in part by their optimal configurations. Optimal configurations are desired when the software is being deployed and during its lifetime. However, initial deployment and subsequent Dynamic Reconfiguration of a software system is difficult because of the interplay of many interdependent factors, including cost, time, application state, and system resources. As the size and complexity of software systems increases, procedures (manual or automated) that assume a static software architecture and environment are becoming untenable. We have developed a novel technique for carrying out the deployment and Reconfiguration planning processes that leverages recent advances in the field of temporal planning. We describe a tool called Planit, which manages the deployment and Reconfiguration of a software system utilizing a temporal planner. Given a model of the structure of a software system, the network upon which the system should be hosted, and a goal configuration, Planit will use the temporal planner to devise possible deployments of the system. Given information about changes in the state of the system, network and a revised goal, Planit will use the temporal planner to devise possible Reconfigurations of the system. We present the results of a case study in which Planit is applied to a system consisting of various components that communicate across an application-level overlay network.
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deployment and Dynamic Reconfiguration planning for distributed software systems
International Conference on Tools with Artificial Intelligence, 2003Co-Authors: Naveed Arshad, Dennis Heimbigner, Alexander L WolfAbstract:Initial deployment and subsequent Dynamic Reconfiguration of a software system is difficult because of the interplay of many interdependent factors, including cost, time, application state, and system resources. As the size and complexity of software systems increases, procedures (manual or automated) that assume a static software architecture and environment are becoming untenable. We have developed a novel technique for carrying out the deployment and Reconfiguration planning processes that leverages recent advances in the field of temporal planning. We describe a tool called Planit, which manages the deployment and Reconfiguration of a software system utilizing a temporal planner. Given a model of the structure of a software system, the network upon which the system should be hosted, and a goal configuration, Planit will use the temporal planner to devise possible deployments of the system. Given information about changes in the state of the system, network and a revised goal, Planit will use the temporal planner to devise possible Reconfigurations of the system. We present the results of a case study in which Planit is applied to a system consisting of various components that communicate across an application-level overlay network.
Andrea Brovelli - One of the best experts on this subject based on the ideXlab platform.
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Dynamic Reconfiguration of Visuomotor-Related Functional Connectivity Networks
Journal of Neuroscience, 2017Co-Authors: Andrea Brovelli, Jean-michel Badier, Francesca Bonini, Fabrice Bartolomei, Xolivier Coulon, Guillaume AuziasAbstract:Cognitive functions arise from the coordination of large-scale brain networks. However, the principles governing interareal functional connectivity Dynamics (FCD) remain elusive. Here, we tested the hypothesis that human executive functions arise from the Dynamic interplay of multiple networks. To do so, we investigated FCD mediating a key executing function, known as arbitrary visuomotor mapping, using brain connectivity analyses of high-gamma activity recorded using MEG and intracranial EEG. Visuomotor mapping was found to arise from the Dynamic interplay of three partly overlapping cortico-cortical and cortico-subcortical functional connectivity (FC) networks. First, visual and parietal regions coordinated with sensorimotor and premotor areas. Second, the dorsal frontoparietal circuit together with the sensorimotor and associative frontostriatal networks took the lead. Finally, cortico-cortical interhemispheric coordination among bilateral sensorimotor regions coupled with the left frontoparietal network and visual areas. We suggest that these networks reflect the processing of visual information, the emergence of visuomotor plans, and the processing of somatosensory reaffer-ence or action's outcomes, respectively. We thus demonstrated that visuomotor integration resides in the Dynamic Reconfiguration of multiple cortico-cortical and cortico-subcortical FC networks. More generally, we showed that visuomotor-related FC is nonstationary and displays switching Dynamics and areal flexibility over timescales relevant for task performance. In addition, visuomotor-related FC is characterized by sparse connectivity with density 10%. To conclude, our results elucidate the relation between Dynamic network Reconfiguration and executive functions over short timescales and provide a candidate entry point toward a better understanding of cognitive architectures.
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Dynamic Reconfiguration of visuomotor-related functional connectivity networks
Journal of Neuroscience, 2016Co-Authors: Jean-michel Badier, Francesca Bonini, Fabrice Bartolomei, Guillaume Auzias, Olivier Coulon, Abdelhak Mahmoudi, Sylvain Takerkart, Fakhita Regragui, Driss Boussaoud, Andrea BrovelliAbstract:Cognitive functions arise from the coordination of large-scale brain networks. Yet, the principles governing interareal functional connectivity Dynamics (FCD) remain elusive. Here, we test the hypothesis that human executive functions arise from the Dynamic interplay of multiple networks. To do so, we investigated FCD mediating a key executing function, known as arbitrary visuomotor mapping, using brain connectivity analyses of high-gamma activity recorded using magnetoencephalography and intracranial electroencephalography. Visuomotor mapping was found to arise from the Dynamic interplay of three partly-overlapping cortico-cortical and cortico-subcortical FC networks. First, visual and parietal regions coordinated with sensorimotor and premotor areas. Second, the dorsal fronto-parietal circuit together with the sensorimotor and associative fronto-striatal networks took the lead. Finally, cortico-cortical interhemispheric coordination among bilateral sensorimotor regions coupled with the left fronto-parietal network and visual areas. We suggest that these networks reflect the processing of visual information, the emergence of visuomotor plans and the processing of somatosensory reafference or action's outcomes, respectively. We thus demonstrated that visuomotor integration resides in the Dynamic Reconfiguration of multiple cortico-cortical and cortico-subcortical FC networks. More generally, we showed that visuomotor-related FC is non-stationary, and displays switching Dynamics and areal flexibility over time scales relevant for task performance. In addition, visuomotor-related FC is characterized by sparse connectivity with density less than 10%. To conclude, our results elucidate the relation between Dynamic network Reconfiguration and executive functions over short time scales, and provide a candidate entry point towards a better understanding of cognitive architectures.
Yoshiaki Kakuda - One of the best experts on this subject based on the ideXlab platform.
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MSN - A service discovery protocol for mobile ad hoc networks based on service provision groups and their Dynamic Reconfiguration
Lecture Notes in Computer Science, 2005Co-Authors: Tomoyuki Ohta, Yoshiaki KakudaAbstract:Mobile ad hoc networks can be formed by a group of wireless nodes without requiring the use of any preexisting infrastructure. Therefore nodes of such networks can not assume which services exist and where they are hosted. A service discovery protocol that provides automatic discovery of desired services is particularly important to save user from the trouble of configuration and quick access to services. Recently, a service discovery protocol that uses broadcast and introduces the cache function has been proposed. There was a problem of the number of messages increasing with the increase in the number of clients which performs a service discovery request, and becoming the cause of congestion. In this paper, we propose a new service discovery protocol for mobile ad hoc networks, which is characterized by service provision groups and their Dynamic Reconfiguration for the purpose of reducing the number of control messages, and a simulation study is presented to show the effect of the proposed protocol.
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a service discovery protocol for mobile ad hoc networks based on service provision groups and their Dynamic Reconfiguration
Mobile Ad-hoc and Sensor Networks, 2005Co-Authors: Tomoyuki Ohta, Yoshiaki KakudaAbstract:Mobile ad hoc networks can be formed by a group of wireless nodes without requiring the use of any preexisting infrastructure. Therefore nodes of such networks can not assume which services exist and where they are hosted. A service discovery protocol that provides automatic discovery of desired services is particularly important to save user from the trouble of configuration and quick access to services. Recently, a service discovery protocol that uses broadcast and introduces the cache function has been proposed. There was a problem of the number of messages increasing with the increase in the number of clients which performs a service discovery request, and becoming the cause of congestion. In this paper, we propose a new service discovery protocol for mobile ad hoc networks, which is characterized by service provision groups and their Dynamic Reconfiguration for the purpose of reducing the number of control messages, and a simulation study is presented to show the effect of the proposed protocol.
Naveed Arshad - One of the best experts on this subject based on the ideXlab platform.
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Deployment and Dynamic Reconfiguration planning for distributed software systems
Software Quality Journal, 2007Co-Authors: Naveed Arshad, Dennis Heimbigner, Alexander L WolfAbstract:The quality of software systems are determined in part by their optimal configurations. Optimal configurations are desired when the software is being deployed and during its lifetime. However, initial deployment and subsequent Dynamic Reconfiguration of a software system is difficult because of the interplay of many interdependent factors, including cost, time, application state, and system resources. As the size and complexity of software systems increases, procedures (manual or automated) that assume a static software architecture and environment are becoming untenable. We have developed a novel technique for carrying out the deployment and Reconfiguration planning processes that leverages recent advances in the field of temporal planning. We describe a tool called Planit, which manages the deployment and Reconfiguration of a software system utilizing a temporal planner. Given a model of the structure of a software system, the network upon which the system should be hosted, and a goal configuration, Planit will use the temporal planner to devise possible deployments of the system. Given information about changes in the state of the system, network and a revised goal, Planit will use the temporal planner to devise possible Reconfigurations of the system. We present the results of a case study in which Planit is applied to a system consisting of various components that communicate across an application-level overlay network.
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deployment and Dynamic Reconfiguration planning for distributed software systems
International Conference on Tools with Artificial Intelligence, 2003Co-Authors: Naveed Arshad, Dennis Heimbigner, Alexander L WolfAbstract:Initial deployment and subsequent Dynamic Reconfiguration of a software system is difficult because of the interplay of many interdependent factors, including cost, time, application state, and system resources. As the size and complexity of software systems increases, procedures (manual or automated) that assume a static software architecture and environment are becoming untenable. We have developed a novel technique for carrying out the deployment and Reconfiguration planning processes that leverages recent advances in the field of temporal planning. We describe a tool called Planit, which manages the deployment and Reconfiguration of a software system utilizing a temporal planner. Given a model of the structure of a software system, the network upon which the system should be hosted, and a goal configuration, Planit will use the temporal planner to devise possible deployments of the system. Given information about changes in the state of the system, network and a revised goal, Planit will use the temporal planner to devise possible Reconfigurations of the system. We present the results of a case study in which Planit is applied to a system consisting of various components that communicate across an application-level overlay network.
