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Jui-sung Hung - One of the best experts on this subject based on the ideXlab platform.
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Immediate and Long-Term Results of Percutaneous Inoue Balloon Mitral Commissurotomy With Use of a Simple Height-Derived Derived Balloon Sizing Method for the Stepwise Dilation Technique
Mayo Clinic proceedings, 1996Co-Authors: Kean-wah Lau, Wei Gao, Zee-pin Ding, Jui-sung HungAbstract:Objective To assess the short- and long-term efficacy of Inoue balloon percutaneous transvenous mitral commissurotomy (PTMC) with use of our simple balloon Sizing Method based on patient height. Design Data from 105 consecutive patients with symptomatic mitral stenosis who underwent 107 PTMC procedures between October 1991 and April 1995 at our hospital were analyzed. Results All PTMC procedures were successfully completed with no instances of cardiac perforation, systemic embolism, severe mitral regurgitation (grade 3 or more angiographically), or death. The mean mitral valve area increased from 0.8 ± 0.2 cm to 1.7 ± 0.4 cm2 (P = 0.0001), as assessed echocardiographically. Optimal results—defined as an improvement in valve area of 50% or more or a final valve area of 1.5 em or more without significant mitral regurgitation (an increase in mitral regurgitation of two or more grades or a final regurgitation of grade 3 or more)—were obtained in 96% of patients. At a mean follow-up interval of 20 months, symptomatic benefit was maintained in 97% of patients. Echocardiographic evidence of restenosis (loss of more than 50% initial gain in valve area, a valve area of less than 1.5 cm2, or both) was noted in 9.8%. Conclusion Inoue balloon PTMC with use of our simple balloon Sizing Method yielded excellent shortand long-term results in terms of mitral valve enlargement and sustained symptomatic benefit without the creation of severe mitral regurgitation.
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A simple balloon-Sizing Method in Inoue-balloon percutaneous transvenous mitral commissurotomy
Catheterization and Cardiovascular Diagnosis, 1994Co-Authors: Jui-sung HungAbstract:This study was carried out to examine whether the previously determined balloon Sizing Method based on patient height was valid for percutaneous transvenous mitral commissurotomy using the current second-generation Inoue balloon catheter. The study consisted of 70 patients with pliable noncalcified mitral valves (group 1) and 85 patients with calcified mitral valves and/or severe subvalvular lesions (group 2). The mitral valve area was increased more in group 1 than in group 2 (1.0 ± 0.3 to 1.9 ± 0.5 cm2 versus 1.0 ± 0.3 to 1.6 ± 0.5 cm2, P = 0.002). Using the stepwise dilatation technique, none of the group 1 patients developed severe mitral regurgitation. Severe mitral regurgitation occurred in 4 patients (4.7%) in group 2. In conclusion, a simple balloon Sizing Method based on body height for selection of an appropriate-sized balloon catheter, as well as an initial inflated balloon diameter for the stepwise dilatation technique is useful for optimal acute outcomes in mitral commissurotomy. © Wiley-Liss, Inc.
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A simple balloon‐Sizing Method in Inoue‐balloon percutaneous transvenous mitral commissurotomy
Catheterization and cardiovascular diagnosis, 1994Co-Authors: Kean‐wah Lau, Jui-sung HungAbstract:This study was carried out to examine whether the previously determined balloon Sizing Method based on patient height was valid for percutaneous transvenous mitral commissurotomy using the current second-generation Inoue balloon catheter. The study consisted of 70 patients with pliable noncalcified mitral valves (group 1) and 85 patients with calcified mitral valves and/or severe subvalvular lesions (group 2). The mitral valve area was increased more in group 1 than in group 2 (1.0 ± 0.3 to 1.9 ± 0.5 cm2 versus 1.0 ± 0.3 to 1.6 ± 0.5 cm2, P = 0.002). Using the stepwise dilatation technique, none of the group 1 patients developed severe mitral regurgitation. Severe mitral regurgitation occurred in 4 patients (4.7%) in group 2. In conclusion, a simple balloon Sizing Method based on body height for selection of an appropriate-sized balloon catheter, as well as an initial inflated balloon diameter for the stepwise dilatation technique is useful for optimal acute outcomes in mitral commissurotomy. © Wiley-Liss, Inc.
Luis M. Fernández - One of the best experts on this subject based on the ideXlab platform.
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Sizing optimization dynamic modeling and energy management strategies of a stand alone pv hydrogen battery based hybrid system
International Journal of Hydrogen Energy, 2013Co-Authors: Manuel Castañeda, Higinio Sánchez, Antonio Cano, Francisco Jurado, Luis M. FernándezAbstract:Abstract This paper presents a Sizing Method and different control strategies for the suitable energy management of a stand-alone hybrid system based on photovoltaic (PV) solar panels, hydrogen subsystem and battery. The battery and hydrogen subsystem, which is composed of fuel cell (FC), electrolyzer and hydrogen storage tank, act as energy storage and support system. In order to efficiently utilize the energy sources integrated in the hybrid system, an appropriate Sizing is necessary. In this paper, a new Sizing Method based on Simulink Design Optimization (SDO) of MATLAB was used to perform a technical optimization of the hybrid system components. An analysis cost has been also performed, in that the configuration under study has been compared with those integrating only batteries and only hydrogen system. The dynamic model of the designed hybrid system is detailed in this paper. The models, implemented in MATLAB-Simulink environment, have been designed from commercially available components. Three control strategies based on operating modes and combining technical-economic aspects are considered for the energy management of the hybrid system. They have been designed, primarily, to satisfy the load power demand and, secondarily, to maintain a certain level at the hydrogen tank (hydrogen energy reserve), and at the state of charge (SOC) of the battery bank to extend its life, taking into account also technical-economic analysis. Dynamic simulations were performed to evaluate the configuration, Sizing and control strategies for the energy management of the hybrid system under study in this work. Simulation results show that the proposed hybrid system with the presented controls is able to provide the energy demanded by the loads, while maintaining a certain energy reserve in the storage sources.
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Sizing optimization, dynamic modeling and energy management strategies of a stand-alone PV/hydrogen/battery-based hybrid system
International Journal of Hydrogen Energy, 2013Co-Authors: Manuel Castañeda, Higinio Sánchez, Antonio Cano, Francisco Jurado, Luis M. FernándezAbstract:Abstract This paper presents a Sizing Method and different control strategies for the suitable energy management of a stand-alone hybrid system based on photovoltaic (PV) solar panels, hydrogen subsystem and battery. The battery and hydrogen subsystem, which is composed of fuel cell (FC), electrolyzer and hydrogen storage tank, act as energy storage and support system. In order to efficiently utilize the energy sources integrated in the hybrid system, an appropriate Sizing is necessary. In this paper, a new Sizing Method based on Simulink Design Optimization (SDO) of MATLAB was used to perform a technical optimization of the hybrid system components. An analysis cost has been also performed, in that the configuration under study has been compared with those integrating only batteries and only hydrogen system. The dynamic model of the designed hybrid system is detailed in this paper. The models, implemented in MATLAB-Simulink environment, have been designed from commercially available components. Three control strategies based on operating modes and combining technical-economic aspects are considered for the energy management of the hybrid system. They have been designed, primarily, to satisfy the load power demand and, secondarily, to maintain a certain level at the hydrogen tank (hydrogen energy reserve), and at the state of charge (SOC) of the battery bank to extend its life, taking into account also technical-economic analysis. Dynamic simulations were performed to evaluate the configuration, Sizing and control strategies for the energy management of the hybrid system under study in this work. Simulation results show that the proposed hybrid system with the presented controls is able to provide the energy demanded by the loads, while maintaining a certain energy reserve in the storage sources.
Manuel Castañeda - One of the best experts on this subject based on the ideXlab platform.
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Sizing optimization dynamic modeling and energy management strategies of a stand alone pv hydrogen battery based hybrid system
International Journal of Hydrogen Energy, 2013Co-Authors: Manuel Castañeda, Higinio Sánchez, Antonio Cano, Francisco Jurado, Luis M. FernándezAbstract:Abstract This paper presents a Sizing Method and different control strategies for the suitable energy management of a stand-alone hybrid system based on photovoltaic (PV) solar panels, hydrogen subsystem and battery. The battery and hydrogen subsystem, which is composed of fuel cell (FC), electrolyzer and hydrogen storage tank, act as energy storage and support system. In order to efficiently utilize the energy sources integrated in the hybrid system, an appropriate Sizing is necessary. In this paper, a new Sizing Method based on Simulink Design Optimization (SDO) of MATLAB was used to perform a technical optimization of the hybrid system components. An analysis cost has been also performed, in that the configuration under study has been compared with those integrating only batteries and only hydrogen system. The dynamic model of the designed hybrid system is detailed in this paper. The models, implemented in MATLAB-Simulink environment, have been designed from commercially available components. Three control strategies based on operating modes and combining technical-economic aspects are considered for the energy management of the hybrid system. They have been designed, primarily, to satisfy the load power demand and, secondarily, to maintain a certain level at the hydrogen tank (hydrogen energy reserve), and at the state of charge (SOC) of the battery bank to extend its life, taking into account also technical-economic analysis. Dynamic simulations were performed to evaluate the configuration, Sizing and control strategies for the energy management of the hybrid system under study in this work. Simulation results show that the proposed hybrid system with the presented controls is able to provide the energy demanded by the loads, while maintaining a certain energy reserve in the storage sources.
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Sizing optimization, dynamic modeling and energy management strategies of a stand-alone PV/hydrogen/battery-based hybrid system
International Journal of Hydrogen Energy, 2013Co-Authors: Manuel Castañeda, Higinio Sánchez, Antonio Cano, Francisco Jurado, Luis M. FernándezAbstract:Abstract This paper presents a Sizing Method and different control strategies for the suitable energy management of a stand-alone hybrid system based on photovoltaic (PV) solar panels, hydrogen subsystem and battery. The battery and hydrogen subsystem, which is composed of fuel cell (FC), electrolyzer and hydrogen storage tank, act as energy storage and support system. In order to efficiently utilize the energy sources integrated in the hybrid system, an appropriate Sizing is necessary. In this paper, a new Sizing Method based on Simulink Design Optimization (SDO) of MATLAB was used to perform a technical optimization of the hybrid system components. An analysis cost has been also performed, in that the configuration under study has been compared with those integrating only batteries and only hydrogen system. The dynamic model of the designed hybrid system is detailed in this paper. The models, implemented in MATLAB-Simulink environment, have been designed from commercially available components. Three control strategies based on operating modes and combining technical-economic aspects are considered for the energy management of the hybrid system. They have been designed, primarily, to satisfy the load power demand and, secondarily, to maintain a certain level at the hydrogen tank (hydrogen energy reserve), and at the state of charge (SOC) of the battery bank to extend its life, taking into account also technical-economic analysis. Dynamic simulations were performed to evaluate the configuration, Sizing and control strategies for the energy management of the hybrid system under study in this work. Simulation results show that the proposed hybrid system with the presented controls is able to provide the energy demanded by the loads, while maintaining a certain energy reserve in the storage sources.
Yi Luo - One of the best experts on this subject based on the ideXlab platform.
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an improved optimal Sizing Method for wind solar battery hybrid power system
IEEE Transactions on Sustainable Energy, 2013Co-Authors: Lin Xu, Xinbo Ruan, Chengxiong Mao, Buhan Zhang, Yi LuoAbstract:This paper proposes an improved optimal Sizing Method for wind-solar-battery hybrid power system (WSB-HPS), considering the system working in stand-alone and grid-connected modes. The proposed Method is based on the following principles: a) high power supply reliability; b) full utilization of the complementary characteristics of wind and solar; c) small fluctuation of power injected into the grid; d) optimization of the battery's charge and discharge state; e) minimization of the total cost of system. Compared with the traditional Methods, the proposed Method can achieve a higher power supply reliability while require less battery capacity in stand-alone mode. And in grid-connected mode, the optimization strategy based on energy filter is further utilized to achieve the optimal battery capacity. Thus, the proposed Method can achieve a much smaller fluctuation of power injected into the grid. In addition, the battery's charge and discharge state can be optimized thanks to the consideration of the battery's depth of discharge (DOD), the charge/discharge current, rate and cycles, which will prolong the battery's lifetime. A case study of WSB-HPS located in Hohhot, China is presented to verify the advantages of the proposed optimal Sizing Method.
Kean‐wah Lau - One of the best experts on this subject based on the ideXlab platform.
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A simple balloon‐Sizing Method in Inoue‐balloon percutaneous transvenous mitral commissurotomy
Catheterization and cardiovascular diagnosis, 1994Co-Authors: Kean‐wah Lau, Jui-sung HungAbstract:This study was carried out to examine whether the previously determined balloon Sizing Method based on patient height was valid for percutaneous transvenous mitral commissurotomy using the current second-generation Inoue balloon catheter. The study consisted of 70 patients with pliable noncalcified mitral valves (group 1) and 85 patients with calcified mitral valves and/or severe subvalvular lesions (group 2). The mitral valve area was increased more in group 1 than in group 2 (1.0 ± 0.3 to 1.9 ± 0.5 cm2 versus 1.0 ± 0.3 to 1.6 ± 0.5 cm2, P = 0.002). Using the stepwise dilatation technique, none of the group 1 patients developed severe mitral regurgitation. Severe mitral regurgitation occurred in 4 patients (4.7%) in group 2. In conclusion, a simple balloon Sizing Method based on body height for selection of an appropriate-sized balloon catheter, as well as an initial inflated balloon diameter for the stepwise dilatation technique is useful for optimal acute outcomes in mitral commissurotomy. © Wiley-Liss, Inc.
