The Experts below are selected from a list of 20874 Experts worldwide ranked by ideXlab platform
Shuji Tasaka - One of the best experts on this subject based on the ideXlab platform.
-
a group Synchronization Mechanism for live media in multicast communications
Global Communications Conference, 1997Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:To support multicast communications for live media, the authors propose a group Synchronization Mechanism and enhance an intra-stream/inter-stream Synchronization Mechanism which they previously proposed for live media. The proposed method employs estimates of network delays for adjustment of the output timing among the destinations. The authors have implemented the Mechanisms on a lip-synch experimental system. Live video of a speaker and his voice captured at a source are multicast, and then they are synchronized and output at the destinations. This paper also presents the system performance such as coefficient of variation of output interval, total pause time, mean square error of Synchronization, average output rate, and average delay.
-
a group Synchronization Mechanism for stored media in multicast communications
International Conference on Computer Communications, 1997Co-Authors: Yutaka Ishibashi, A Tsuji, Shuji TasakaAbstract:This paper proposes a group Synchronization Mechanism, which synchronizes slave destinations with the master destination, for stored media in multicast communications. At the master and slave destinations, intra-stream and inter-stream Synchronization Mechanisms which were proposed by the authors are employed to output the master media stream and slave media streams synchronously. We achieve group Synchronization by adjusting the output timing of the master media stream at each slave destination to that at the master destination. We also deal with traffic control by media scaling and control of joining an in-progress multicast group. Furthermore, the paper presents experimental results using an ATM network. It shows the validity of the Mechanism and illustrates the influence of parameters on the system performance.
-
Synchronization Mechanism for continuous media in multimedia communications
Proceedings - IEEE INFOCOM, 1995Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:This paper proposes a media Synchronization Mechanism which adjusts the output timing among stored continuous media streams in multimedia communications. The proposed method consists of intra-stream and inter-stream Synchronization Mechanisms. The inter-stream Synchronization control is performed after the intra-stream Synchronization control. Then, whether the intra-stream Synchronization is still maintained or not is checked. The Mechanism can be used in networks which have unknown delay bounds, and it does not suppose periodical generation of media units such as video frames. It also deals with two types of media streams depending on how strictly to synchronize media streams: tightly-coupled media streams and loosely-coupled media streams. Furthermore, we enhance the Mechanism to support realtime-inputted media streams as in TV conferencing.
-
INFOCOM - A Synchronization Mechanism for continuous media in multimedia communications
Proceedings of INFOCOM'95, 1Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:This paper proposes a media Synchronization Mechanism which adjusts the output timing among stored continuous media streams in multimedia communications. The proposed method consists of intra-stream and inter-stream Synchronization Mechanisms. The inter-stream Synchronization control is performed after the intra-stream Synchronization control. Then, whether the intra-stream Synchronization is still maintained or not is checked. The Mechanism con be used in networks which have unknown delay bounds, and it does not suppose periodical generation of media units such as video frames. It also deals with two types of media streams depending on how strictly to synchronize media streams: tightly-coupled media streams and loosely-coupled media streams. Furthermore, we enhance the Mechanism to support real-time-inputted media streams as in TV conferencing.
-
Measured performance of a live media Synchronization Mechanism in an ATM network
Proceedings of ICC SUPERCOMM '96 - International Conference on Communications, 1Co-Authors: Yutaka Ishibashi, Shuji Tasaka, A TsujiAbstract:This paper proposes a media Synchronization Mechanism for live media streams. The Mechanism can also handle stored media streams by changing the parameter values. The authors have implemented the Mechanism on a lip-synch experimental system using an ATM network. Live video of a speaker and his voice realtime-inputted at a source workstation are transferred separately on two distinct TCP connections, and then they are synchronized and outputted at a destination workstation. This paper also evaluates the system performance such as the mean square error of Synchronization, average output rate, and the average delay time.
M. Sobolewski - One of the best experts on this subject based on the ideXlab platform.
-
a dual time vector clock based Synchronization Mechanism for key value data in the silenus file system
International Conference on Parallel and Distributed Systems, 2007Co-Authors: M. Berger, M. SobolewskiAbstract:The SILENUS federated file system was developed by the SORCER research group at Texas Tech University. The federated file system with its dynamic nature does not require any configuration by the end users and system administrators. The SILENUS file system provides support for disconnected operation. To support disconnected operation a relevant Synchronization Mechanism is needed. This Mechanism must detect and order events properly. It must detect also possible conflicts and resolve these in a consistent manner. This paper describes the new Synchronization Mechanism needed for providing data consistency. It introduces dual-time vector clocks to order events and detect conflicts. A conflict resolution algorithm is defined that does not require user interactions. It introduces the switchback problem and how it can be avoided. The Synchronization Mechanisms presented in this paper can be adapted to synchronize any key-value based data in any distributed system.
-
ICPADS - A dual-time vector clock based Synchronization Mechanism for key-value data in the SILENUS file system
2007 International Conference on Parallel and Distributed Systems, 2007Co-Authors: M. Berger, M. SobolewskiAbstract:The SILENUS federated file system was developed by the SORCER research group at Texas Tech University. The federated file system with its dynamic nature does not require any configuration by the end users and system administrators. The SILENUS file system provides support for disconnected operation. To support disconnected operation a relevant Synchronization Mechanism is needed. This Mechanism must detect and order events properly. It must detect also possible conflicts and resolve these in a consistent manner. This paper describes the new Synchronization Mechanism needed for providing data consistency. It introduces dual-time vector clocks to order events and detect conflicts. A conflict resolution algorithm is defined that does not require user interactions. It introduces the switchback problem and how it can be avoided. The Synchronization Mechanisms presented in this paper can be adapted to synchronize any key-value based data in any distributed system.
Yutaka Ishibashi - One of the best experts on this subject based on the ideXlab platform.
-
a group Synchronization Mechanism for live media in multicast communications
Global Communications Conference, 1997Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:To support multicast communications for live media, the authors propose a group Synchronization Mechanism and enhance an intra-stream/inter-stream Synchronization Mechanism which they previously proposed for live media. The proposed method employs estimates of network delays for adjustment of the output timing among the destinations. The authors have implemented the Mechanisms on a lip-synch experimental system. Live video of a speaker and his voice captured at a source are multicast, and then they are synchronized and output at the destinations. This paper also presents the system performance such as coefficient of variation of output interval, total pause time, mean square error of Synchronization, average output rate, and average delay.
-
a group Synchronization Mechanism for stored media in multicast communications
International Conference on Computer Communications, 1997Co-Authors: Yutaka Ishibashi, A Tsuji, Shuji TasakaAbstract:This paper proposes a group Synchronization Mechanism, which synchronizes slave destinations with the master destination, for stored media in multicast communications. At the master and slave destinations, intra-stream and inter-stream Synchronization Mechanisms which were proposed by the authors are employed to output the master media stream and slave media streams synchronously. We achieve group Synchronization by adjusting the output timing of the master media stream at each slave destination to that at the master destination. We also deal with traffic control by media scaling and control of joining an in-progress multicast group. Furthermore, the paper presents experimental results using an ATM network. It shows the validity of the Mechanism and illustrates the influence of parameters on the system performance.
-
Synchronization Mechanism for continuous media in multimedia communications
Proceedings - IEEE INFOCOM, 1995Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:This paper proposes a media Synchronization Mechanism which adjusts the output timing among stored continuous media streams in multimedia communications. The proposed method consists of intra-stream and inter-stream Synchronization Mechanisms. The inter-stream Synchronization control is performed after the intra-stream Synchronization control. Then, whether the intra-stream Synchronization is still maintained or not is checked. The Mechanism can be used in networks which have unknown delay bounds, and it does not suppose periodical generation of media units such as video frames. It also deals with two types of media streams depending on how strictly to synchronize media streams: tightly-coupled media streams and loosely-coupled media streams. Furthermore, we enhance the Mechanism to support realtime-inputted media streams as in TV conferencing.
-
INFOCOM - A Synchronization Mechanism for continuous media in multimedia communications
Proceedings of INFOCOM'95, 1Co-Authors: Yutaka Ishibashi, Shuji TasakaAbstract:This paper proposes a media Synchronization Mechanism which adjusts the output timing among stored continuous media streams in multimedia communications. The proposed method consists of intra-stream and inter-stream Synchronization Mechanisms. The inter-stream Synchronization control is performed after the intra-stream Synchronization control. Then, whether the intra-stream Synchronization is still maintained or not is checked. The Mechanism con be used in networks which have unknown delay bounds, and it does not suppose periodical generation of media units such as video frames. It also deals with two types of media streams depending on how strictly to synchronize media streams: tightly-coupled media streams and loosely-coupled media streams. Furthermore, we enhance the Mechanism to support real-time-inputted media streams as in TV conferencing.
-
Measured performance of a live media Synchronization Mechanism in an ATM network
Proceedings of ICC SUPERCOMM '96 - International Conference on Communications, 1Co-Authors: Yutaka Ishibashi, Shuji Tasaka, A TsujiAbstract:This paper proposes a media Synchronization Mechanism for live media streams. The Mechanism can also handle stored media streams by changing the parameter values. The authors have implemented the Mechanism on a lip-synch experimental system using an ATM network. Live video of a speaker and his voice realtime-inputted at a source workstation are transferred separately on two distinct TCP connections, and then they are synchronized and outputted at a destination workstation. This paper also evaluates the system performance such as the mean square error of Synchronization, average output rate, and the average delay time.
M. Berger - One of the best experts on this subject based on the ideXlab platform.
-
a dual time vector clock based Synchronization Mechanism for key value data in the silenus file system
International Conference on Parallel and Distributed Systems, 2007Co-Authors: M. Berger, M. SobolewskiAbstract:The SILENUS federated file system was developed by the SORCER research group at Texas Tech University. The federated file system with its dynamic nature does not require any configuration by the end users and system administrators. The SILENUS file system provides support for disconnected operation. To support disconnected operation a relevant Synchronization Mechanism is needed. This Mechanism must detect and order events properly. It must detect also possible conflicts and resolve these in a consistent manner. This paper describes the new Synchronization Mechanism needed for providing data consistency. It introduces dual-time vector clocks to order events and detect conflicts. A conflict resolution algorithm is defined that does not require user interactions. It introduces the switchback problem and how it can be avoided. The Synchronization Mechanisms presented in this paper can be adapted to synchronize any key-value based data in any distributed system.
-
ICPADS - A dual-time vector clock based Synchronization Mechanism for key-value data in the SILENUS file system
2007 International Conference on Parallel and Distributed Systems, 2007Co-Authors: M. Berger, M. SobolewskiAbstract:The SILENUS federated file system was developed by the SORCER research group at Texas Tech University. The federated file system with its dynamic nature does not require any configuration by the end users and system administrators. The SILENUS file system provides support for disconnected operation. To support disconnected operation a relevant Synchronization Mechanism is needed. This Mechanism must detect and order events properly. It must detect also possible conflicts and resolve these in a consistent manner. This paper describes the new Synchronization Mechanism needed for providing data consistency. It introduces dual-time vector clocks to order events and detect conflicts. A conflict resolution algorithm is defined that does not require user interactions. It introduces the switchback problem and how it can be avoided. The Synchronization Mechanisms presented in this paper can be adapted to synchronize any key-value based data in any distributed system.
Cruz R De Oliveira - One of the best experts on this subject based on the ideXlab platform.
-
a general purpose multimedia Synchronization Mechanism based on causal relations
IEEE Journal on Selected Areas in Communications, 1996Co-Authors: Jean-pierre Courtiat, Fernando Rust L Da Costa Carmo, Cruz R De OliveiraAbstract:Designing distributed multimedia applications raises temporal and spatial Synchronization issues related to processing, transport, storage, retrieval and presentation of data, sound, still images and video. Within this framework, the paper aims to define a general-purpose multimedia Synchronization Mechanism, known as the conditional delivery Mechanism, capable of addressing both intraand inter-stream Synchronization issues. The proposed Mechanism, based on the identification of causal relations among information units of one or several streams, is designed to ensure that these causal relations, expressed at the user's level, are satisfied when delivering the streams. The conditional delivery Mechanism is analyzed in depth and both informal and formal specifications of the Mechanism are provided. The formal specification refers to an extension of the standard formal description technique LOTOS (RT-LOTOS for real-time LOTOS). Validation results of the conditional delivery Mechanism are finally presented for a distance and interactive training application.
