The Experts below are selected from a list of 311802 Experts worldwide ranked by ideXlab platform

Nguyen Minh Phu - One of the best experts on this subject based on the ideXlab platform.

  • Computational fluid dynamics analysis of the heat transfer and pressure drop of solar air heater with conic-curve profile ribs
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Tu Thien Ngo, Nguyen Minh Phu
    Abstract:

    The present study was to investigate the effect of the conic constants of rough geometries and the associated Reynolds numbers on the heat transfer and pressure drop of a solar air heater. An absorber plate attached to multiple conic-curve profile ribs was comprehensively analyzed. The results showed that decreasing the conic constant induced an increase in the Nusselt number and a decrease in the friction factor; therefore, the thermohydraulic Performance Parameter increased. The friction factor was notably invariable when the conic constant changed in the range of − 0.5 to 0. The maximum thermohydraulic Performance Parameter occurred at a Reynolds number of 8000, whereas the largest thermogeometric Performance Parameter occurred at a Reynolds number of 12,000. A regression analysis was performed for the correlations of both the Nusselt number and the friction factor as functions of the Reynolds number and the conic constant. The correlation coefficients of the Nusselt number and friction factor equations were 0.9978 and 0.9351, respectively.

Wei-liang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • Defining and maximizing PPT—a novel Performance Parameter for IEEE 802.11 DCF
    International Journal of Communication Systems, 2006
    Co-Authors: Keping Long, Wei-liang Zhao
    Abstract:

    Much research has been conducted on saturation throughput of IEEE802.11 DCF, and has led to some improvement. But increasing the successful transmission probability of packet is also important for saving stations' battery energy and decreasing the packet delay. In this paper, we define a new Performance Parameter, named Product of successful transmission Probability and saturation Throughput (PPT), for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An analysis is given to maximize PPT. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according to this expression. The Performance of DCF-PPT is simulated with different stations in terms of saturation throughput, successful transmission probability and PPT. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) on condition that the saturation throughput is not decreased. Copyright © 2006 John Wiley & Sons, Ltd.

  • Defining and maximizing PPT—a novel Performance Parameter for IEEE 802.11 DCF: Research Articles
    International Journal of Communication Systems, 2006
    Co-Authors: Keping Long, Wei-liang Zhao
    Abstract:

    Much research has been conducted on saturation throughput of IEEE802.11 DCF, and has led to some improvement. But increasing the successful transmission probability of packet is also important for saving stations' battery energy and decreasing the packet delay. In this paper, we define a new Performance Parameter, named Product of successful transmission Probability and saturation Throughput (PPT), for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An analysis is given to maximize PPT. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according to this expression. The Performance of DCF-PPT is simulated with different stations in terms of saturation throughput, successful transmission probability and PPT. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) on condition that the saturation throughput is not decreased. Copyright © 2006 John Wiley & Sons, Ltd.

  • MMNS - A new Performance Parameter for IEEE 802.11 DCF
    Management of Multimedia Networks and Services, 2005
    Co-Authors: Keping Long, Wei-liang Zhao, Qianbin Chen, Yujun Kuang
    Abstract:

    In this paper, we define a new Performance Parameter, named PPT, for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according this expression. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) in condition that the saturation throughput is not decreased.

Liu Zheng-xing - One of the best experts on this subject based on the ideXlab platform.

  • Development of Pump Performance Parameter Monitor System Based on ARM and uClinux
    Computer Simulation, 2007
    Co-Authors: Liu Zheng-xing
    Abstract:

    The Performance of pump is important to the system.For the sake of monitoring the Performance of pumps,this paper successfully develops a system for monitoring pump Performance Parameter with ARMuClinux.The monitor system of pump Performance Parameter completes the monitoring of the Performance Parameters of pumps and the data storage.The whole system uses the model of data collection board plus master controller.Data collection board classifies and collects the signals with MCU.Upper controller choose the developer platform based on ARM and uClinux,it completes the saving,displaying and storing of data.The data collection board and master controller communicate with RS232.Now the system is used in the Parameters monitoring of pumps in the submarine.The system successfully completes the Performance monitoring of pumps.By analysing the running Parameters of pumps,the malfunctions of pumps can be predicted.

Tu Thien Ngo - One of the best experts on this subject based on the ideXlab platform.

  • Computational fluid dynamics analysis of the heat transfer and pressure drop of solar air heater with conic-curve profile ribs
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Tu Thien Ngo, Nguyen Minh Phu
    Abstract:

    The present study was to investigate the effect of the conic constants of rough geometries and the associated Reynolds numbers on the heat transfer and pressure drop of a solar air heater. An absorber plate attached to multiple conic-curve profile ribs was comprehensively analyzed. The results showed that decreasing the conic constant induced an increase in the Nusselt number and a decrease in the friction factor; therefore, the thermohydraulic Performance Parameter increased. The friction factor was notably invariable when the conic constant changed in the range of − 0.5 to 0. The maximum thermohydraulic Performance Parameter occurred at a Reynolds number of 8000, whereas the largest thermogeometric Performance Parameter occurred at a Reynolds number of 12,000. A regression analysis was performed for the correlations of both the Nusselt number and the friction factor as functions of the Reynolds number and the conic constant. The correlation coefficients of the Nusselt number and friction factor equations were 0.9978 and 0.9351, respectively.

Keping Long - One of the best experts on this subject based on the ideXlab platform.

  • Defining and maximizing PPT—a novel Performance Parameter for IEEE 802.11 DCF
    International Journal of Communication Systems, 2006
    Co-Authors: Keping Long, Wei-liang Zhao
    Abstract:

    Much research has been conducted on saturation throughput of IEEE802.11 DCF, and has led to some improvement. But increasing the successful transmission probability of packet is also important for saving stations' battery energy and decreasing the packet delay. In this paper, we define a new Performance Parameter, named Product of successful transmission Probability and saturation Throughput (PPT), for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An analysis is given to maximize PPT. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according to this expression. The Performance of DCF-PPT is simulated with different stations in terms of saturation throughput, successful transmission probability and PPT. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) on condition that the saturation throughput is not decreased. Copyright © 2006 John Wiley & Sons, Ltd.

  • Defining and maximizing PPT—a novel Performance Parameter for IEEE 802.11 DCF: Research Articles
    International Journal of Communication Systems, 2006
    Co-Authors: Keping Long, Wei-liang Zhao
    Abstract:

    Much research has been conducted on saturation throughput of IEEE802.11 DCF, and has led to some improvement. But increasing the successful transmission probability of packet is also important for saving stations' battery energy and decreasing the packet delay. In this paper, we define a new Performance Parameter, named Product of successful transmission Probability and saturation Throughput (PPT), for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An analysis is given to maximize PPT. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according to this expression. The Performance of DCF-PPT is simulated with different stations in terms of saturation throughput, successful transmission probability and PPT. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) on condition that the saturation throughput is not decreased. Copyright © 2006 John Wiley & Sons, Ltd.

  • MMNS - A new Performance Parameter for IEEE 802.11 DCF
    Management of Multimedia Networks and Services, 2005
    Co-Authors: Keping Long, Wei-liang Zhao, Qianbin Chen, Yujun Kuang
    Abstract:

    In this paper, we define a new Performance Parameter, named PPT, for 802.11 DCF, which binds successful transmission probability and saturation throughput together. An expression of optimal minimum contention windows (CWmin) is obtained analytically for maximizing PPT. For simplicity, we give a name DCF-PPT to the 802.11 DCF that sets its CWmin according this expression. The simulation results indicate that, compared to 802.11 DCF, DCF-PPT can significantly increase the PPT and successful transmission probability (about 0.95) in condition that the saturation throughput is not decreased.