The Experts below are selected from a list of 4659 Experts worldwide ranked by ideXlab platform
Raja Parasuraman - One of the best experts on this subject based on the ideXlab platform.
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the role of the air traffic controller in future air traffic management an empirical study of active control versus Passive Monitoring
Human Factors, 2001Co-Authors: Ulla Metzger, Raja ParasuramanAbstract:Proposals for air traffic management such as Free Flight call for a transfer of responsibility for separation between aircraft from air traffic controllers (ATCos) to pilots. Under many proposals, the role of the ATCo will change from one of active control to Passive Monitoring. The present study directly compared these types of control with respect to ATCo mental workload, conflict detection, and memory. Eighteen ATCos participated in an air traffic control simulation of Free Flight procedures under moderate and high traffic load. Dependent variables included accuracy and timeliness in detecting potential conflicts, accepting and handing off aircraft, mental workload (as assessed by a secondary task, heart rate variability, and subjective ratings), and memory for aircraft location. High traffic density and Passive control both degraded conflict detection performance. Actual or potential applications of this research include the recommendation that designs for future air traffic management keep authority for separation of aircraft with the controller. Language: en
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Free Flight and the Air Traffic Controller: Active Control versus Passive Monitoring
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 1999Co-Authors: Ulla Metzger, Raja ParasuramanAbstract:Free Flight, as originally proposed by the RTCA (1995), would allow transfer of authority for separation of aircraft from the air traffic controller to the pilot. More recent proposals have called for final authority to rest with the controller (FAA, 1997). These proposals have differing implications for the controller in terms of active control and Passive Monitoring. The present study investigated the effects of active control versus Passive Monitoring and traffic density on controller mental workload, performance, and memory in an air traffic control (ATC) task simulating FF conditions. Eighteen ATC specialists participated in an ATC simulation. Independent variables were (1) active control versus Monitoring of traffic and (2) moderate versus high traffic density. Dependent variables included accuracy and timeliness in detecting potential conflicts, accepting and handing-off aircraft. Mental workload was assessed with a secondary task, heart rate variability and NASA-TLX ratings. Controller memory of a...
F. Zane - One of the best experts on this subject based on the ideXlab platform.
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INFOCOM - Clustering and server selection using Passive Monitoring
Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies, 2002Co-Authors: M. Andrews, B. Shepherd, A. Srinivasan, P. Winkler, F. ZaneAbstract:We consider the problem of client assignment in a distributed system of content servers. We present a system called Webmapper for clustering IP addresses and assigning each cluster to an optimal content server. The system is Passive in that the only information it uses comes from Monitoring the TCP connections between the clients and the servers. It is also flexible in that it makes no a priori assumptions about network topology and server placement and it can react quickly to changing network conditions. We present experimental results to evaluate the performance of Webmapper.
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Clustering and server selection using Passive Monitoring
Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies, 2002Co-Authors: M. Andrews, B. Shepherd, A. Srinivasan, P. Winkler, F. ZaneAbstract:We consider the problem of client assignment in a distributed system of content servers. We present a system called Webmapper for clustering IP addresses and assigning each cluster to an optimal content server. The system is Passive in that the only information it uses comes from Monitoring the TCP connections between the clients and the servers. It is also flexible in that it makes no a priori assumptions about network topology and server placement and it can react quickly to changing network conditions. We present experimental results to evaluate the performance of Webmapper.
Yi-guo Yuan - One of the best experts on this subject based on the ideXlab platform.
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Efficient method of station selection for Passive Monitoring in distributed network using information gain
The IEEE symposium on Computers and Communications, 2010Co-Authors: Xiang Li, Feng Qi, Yi-guo YuanAbstract:Network Monitoring is essential for assessing performance issues, identifying and locating problems. There is increasing interest in Passive Monitoring of flows at multiple locations within a distributed network. In order to figure out how to place monitors under cost-effective and budget constraints within the network, a new approach is presented in this paper, which solves the problem of Monitoring stations selection and the tradeoff between Monitoring cost and reward. Using the method from combinatorial optimization on submodular of information gain, the approach firstly proves that joint entropy and information gain in network models satisfy submodularity under certain conditions, and then an approximate algorithm is proposed to solve optimizing problem of conditional entropies. On the basis, Monitoring stations selected by our solution are much better than existing classical criterion. The simulation results validate the approach, demonstrating the solution improving Monitoring quality, accuracy and computation time.
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ISCC - Efficient method of station selection for Passive Monitoring in distributed network using information gain
The IEEE symposium on Computers and Communications, 2010Co-Authors: Xiang Li, Feng Qi, Yi-guo YuanAbstract:Network Monitoring is essential for assessing performance issues, identifying and locating problems. There is increasing interest in Passive Monitoring of flows at multiple locations within a distributed network. In order to figure out how to place monitors under cost-effective and budget constraints within the network, a new approach is presented in this paper, which solves the problem of Monitoring stations selection and the tradeoff between Monitoring cost and reward. Using the method from combinatorial optimization on submodular of information gain, the approach firstly proves that joint entropy and information gain in network models satisfy submodularity under certain conditions, and then an approximate algorithm is proposed to solve optimizing problem of conditional entropies. On the basis, Monitoring stations selected by our solution are much better than existing classical criterion. The simulation results validate the approach, demonstrating the solution improving Monitoring quality, accuracy and computation time.
Ulla Metzger - One of the best experts on this subject based on the ideXlab platform.
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the role of the air traffic controller in future air traffic management an empirical study of active control versus Passive Monitoring
Human Factors, 2001Co-Authors: Ulla Metzger, Raja ParasuramanAbstract:Proposals for air traffic management such as Free Flight call for a transfer of responsibility for separation between aircraft from air traffic controllers (ATCos) to pilots. Under many proposals, the role of the ATCo will change from one of active control to Passive Monitoring. The present study directly compared these types of control with respect to ATCo mental workload, conflict detection, and memory. Eighteen ATCos participated in an air traffic control simulation of Free Flight procedures under moderate and high traffic load. Dependent variables included accuracy and timeliness in detecting potential conflicts, accepting and handing off aircraft, mental workload (as assessed by a secondary task, heart rate variability, and subjective ratings), and memory for aircraft location. High traffic density and Passive control both degraded conflict detection performance. Actual or potential applications of this research include the recommendation that designs for future air traffic management keep authority for separation of aircraft with the controller. Language: en
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Free Flight and the Air Traffic Controller: Active Control versus Passive Monitoring
Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 1999Co-Authors: Ulla Metzger, Raja ParasuramanAbstract:Free Flight, as originally proposed by the RTCA (1995), would allow transfer of authority for separation of aircraft from the air traffic controller to the pilot. More recent proposals have called for final authority to rest with the controller (FAA, 1997). These proposals have differing implications for the controller in terms of active control and Passive Monitoring. The present study investigated the effects of active control versus Passive Monitoring and traffic density on controller mental workload, performance, and memory in an air traffic control (ATC) task simulating FF conditions. Eighteen ATC specialists participated in an ATC simulation. Independent variables were (1) active control versus Monitoring of traffic and (2) moderate versus high traffic density. Dependent variables included accuracy and timeliness in detecting potential conflicts, accepting and handing-off aircraft. Mental workload was assessed with a secondary task, heart rate variability and NASA-TLX ratings. Controller memory of a...
M. Andrews - One of the best experts on this subject based on the ideXlab platform.
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INFOCOM - Clustering and server selection using Passive Monitoring
Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies, 2002Co-Authors: M. Andrews, B. Shepherd, A. Srinivasan, P. Winkler, F. ZaneAbstract:We consider the problem of client assignment in a distributed system of content servers. We present a system called Webmapper for clustering IP addresses and assigning each cluster to an optimal content server. The system is Passive in that the only information it uses comes from Monitoring the TCP connections between the clients and the servers. It is also flexible in that it makes no a priori assumptions about network topology and server placement and it can react quickly to changing network conditions. We present experimental results to evaluate the performance of Webmapper.
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Clustering and server selection using Passive Monitoring
Proceedings.Twenty-First Annual Joint Conference of the IEEE Computer and Communications Societies, 2002Co-Authors: M. Andrews, B. Shepherd, A. Srinivasan, P. Winkler, F. ZaneAbstract:We consider the problem of client assignment in a distributed system of content servers. We present a system called Webmapper for clustering IP addresses and assigning each cluster to an optimal content server. The system is Passive in that the only information it uses comes from Monitoring the TCP connections between the clients and the servers. It is also flexible in that it makes no a priori assumptions about network topology and server placement and it can react quickly to changing network conditions. We present experimental results to evaluate the performance of Webmapper.
