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Search Results: 1 - 10 of 3679 matches for " Tzu-Hsiang Yen "
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Numerical simulation and performance test of metal hydride hydrogen storage system
Tzu-Hsiang Yen, Bin-Hao Chen, Bao-Dong Chen
International Journal of Energy and Environment , 2011,
Abstract: Metal hydride reactors are widely used in many industrial applications, such as hydrogen storage, thermal compression, heat pump, etc. According to the research requirement of metal hydride hydrogen storage, the thermal analyses have been implemented in the paper. The metal hydride reaction beds are considered as coupled cylindrical tube modules which combine the chemical absorption and desorption in metal hydride. The model is then used metal hydride LaNi5 as an example to predict the performance of metal hydride hydrogen storage devices, such as the position of hydration front and the thermal flux. Under the different boundary condition the characteristics of heat transfer and mass transfer in metal hydride have influence on the hydrogen absorption and desorption. The researches revealed that the scroll design can improve the temperature distribution in the reactor and the porous tube for directing hydrogen can increase the penetration depth of hydride reaction to decrease the hydrogen absorption time.
Design and development of major balance of plant components in solid oxide fuel cell system
Wen-Tang Hong, Tzu-Hsiang Yen, Cheng-Nan Huang, Hsueh-I Tan, Yu Chao
International Journal of Energy and Environment , 2013,
Abstract: The balance of plant (BOP) of a Solid Oxide Fuel Cell (SOFC) system with a 2 kW stack and an electric efficiency of 40% is optimized using commercial GCTool software. The simulation results provide a detailed understanding of the optimal operating temperature, pressure and mass flow rate in all of the major BOP components, i.e., the gas distributor, the afterburner, the reformer and the heat exchanger. A series of experimental trials are performed to validate the simulation results. Overall, the results presented in this study not only indicate an appropriate set of operating conditions for the SOFC power system, but also suggest potential design improvements for several of the BOP components.
Numerical investigation into premixed hydrogen combustion within two-stage porous media burner of 1 kW solid oxide fuel cell system
Tzu-Hsiang Yen, Wen-Tang Hong, Yu-Ching Tsai, Hung-Yu Wang, Cheng-Nan Huang, Chien-Hsiung Lee, Bao-Dong Chen
International Journal of Energy and Environment , 2010,
Abstract: Numerical simulations are performed to analyze the combustion of the anode off-gas / cathode off-gas mixture within the two-stage porous media burner of a 1 kW solid oxide fuel cell (SOFC) system. In performing the simulations, the anode gas is assumed to be hydrogen and the combustion of the gas mixture is modeled using a turbulent flow model. The validity of the numerical model is confirmed by comparing the simulation results for the flame barrier temperature and the porous media temperature with the corresponding experimental results. Simulations are then performed to investigate the effects of the hydrogen content and the burner geometry on the temperature distribution within the burner and the corresponding operational range. It is shown that the maximum flame temperature increases with an increasing hydrogen content. In addition, it is found that the burner has an operational range of 1.2~6.5 kW when assigned its default geometry settings (i.e. a length and diameter of 0.17 m and 0.06 m, respectively), but increases to 2~9 kW and 2.6~11.5 kW when the length and diameter are increased by a factor of 1.5, respectively. Finally, the operational range increases to 3.5~16.5 kW when both the diameter and the length of the burner are increased by a factor of 1.5.
Bluetooth Based Chaos Synchronization Using Particle Swarm Optimization and Its Applications to Image Encryption
Her-Terng Yau,Tzu-Hsiang Hung,Chia-Chun Hsieh
Sensors , 2012, DOI: 10.3390/s120607468
Abstract: This study used the complex dynamic characteristics of chaotic systems and Bluetooth to explore the topic of wireless chaotic communication secrecy and develop a communication security system. The PID controller for chaos synchronization control was applied, and the optimum parameters of this PID controller were obtained using a Particle Swarm Optimization (PSO) algorithm. Bluetooth was used to realize wireless transmissions, and a chaotic wireless communication security system was developed in the design concept of a chaotic communication security system. The experimental results show that this scheme can be used successfully in image encryption.
Application of CMAC Neural Network to Solar Energy Heliostat Field Fault Diagnosis
Neng-Sheng Pai,Her-Terng Yau,Tzu-Hsiang Hung,Chin-Pao Hung
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/938162
Abstract:
Submicron-Bubble-Enhanced Focused Ultrasound for Blood–Brain Barrier Disruption and Improved CNS Drug Delivery
Ching-Hsiang Fan, Hao-Li Liu, Chien-Yu Ting, Ya-Hsuan Lee, Chih-Ying Huang, Yan-Jung Ma, Kuo-Chen Wei, Tzu-Chen Yen, Chih-Kuang Yeh
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0096327
Abstract: The use of focused ultrasound (FUS) with microbubbles has been proven to induce transient blood–brain barrier opening (BBB-opening). However, FUS-induced inertial cavitation of microbubbles can also result in erythrocyte extravasations. Here we investigated whether induction of submicron bubbles to oscillate at their resonant frequency would reduce inertial cavitation during BBB-opening and thereby eliminate erythrocyte extravasations in a rat brain model. FUS was delivered with acoustic pressures of 0.1–4.5 MPa using either in-house manufactured submicron bubbles or standard SonoVue microbubbles. Wideband and subharmonic emissions from bubbles were used to quantify inertial and stable cavitation, respectively. Erythrocyte extravasations were evaluated by in vivo post-treatment magnetic resonance susceptibility-weighted imaging, and finally by histological confirmation. We found that excitation of submicron bubbles with resonant frequency-matched FUS (10 MHz) can greatly limit inertial cavitation while enhancing stable cavitation. The BBB-opening was mainly caused by stable cavitation, whereas the erythrocyte extravasation was closely correlated with inertial cavitation. Our technique allows extensive reduction of inertial cavitation to induce safe BBB-opening. Furthermore, the safety issue of BBB-opening was not compromised by prolonging FUS exposure time, and the local drug concentrations in the brain tissues were significantly improved to 60 times (BCNU; 18.6 μg versus 0.3 μg) by using chemotherapeutic agent-loaded submicron bubbles with FUS. This study provides important information towards the goal of successfully translating FUS brain drug delivery into clinical use.
Design of a Patient-Centered Appointment Scheduling with Artificial Neural Network and Discrete Event Simulation  [PDF]
Wen-Jen Chang, Yen-Hsiang Chang
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.111007
Abstract: Quality of medical services is even more critical than ever in a highly competitive health care industry. Long waiting time is a major source of patient dissatisfaction, thus, the issue of how to reduce waiting time to improve service quality is very important. A well-designed appointment scheduling system can effectively shorten the patient waiting time and enhance their satisfaction. This study aims to propose a framework for individualized outpatient appointment scheduling (OAS) in a dental clinic which composed of one attending dentist and two resident dentists. To design the OAS, firstly, the prediction model of the treatment duration of an individual patient was established by using artificial neural network. Secondly, discrete event simulation method was used to develop the simulation model which simulates the operations of the studied dental clinic. Finally, the established simulation model was used to evaluate the performance of the appointment scheduling. The proposed model consists of numbers of main features: 1) the service providers composed of multiple dentists with different professional competence levels; 2) there are two types of patients (return and not-return patients); 3) patient no-shows was considered; and 4) a variety of medical treatments (requiring different treatment time) are provided to the patients. The results of the study show that the proposed OAS can effectively improve the service performance of the dental clinic, this could be caused by patient’s characteristics were taken into consideration of building an appropriated appointment interval.
Current Evidence of the Monoaminergic Regulation of Romantic Love and Relationship  [PDF]
Wei-Hsi Chen, Mei-Yen Chu, Yuan-Hsiang Chu, Yen-Chin Lin, Kuo-Yen Chen
Advances in Sexual Medicine (ASM) , 2017, DOI: 10.4236/asm.2017.73011
Abstract:
Introduction: Sexual response cycle is modulated by a variety of biological factors, especially antidepressants and antipsychotics. Although the circuit of romantic love has recently been delineated, the biological impact on romantic love is barely mentioned in human, however. Methods: In thus study, a comprehensive literature review was completed to elucidate the role of central monoamines, including dopamine, serotonin, norepinephrine, epinephrine, melatonin and histamine, for the romantic love and relationship in human. Results: The central circuit of romantic love includes the mesolimbic and mesocortical tract and their extensions widely distributed in cortical, subcortical and brainstem structures. The activation of brain foci progressively decreases along with the romantic relationship in many areas, including the bilateral caudate and ventral tegmentum area without change of passionate love. Hyperactivity of dopamine and serotonin is suggested at the synaptic level for romantic love in lovers, probably through an inhibition of transporters or increase of terminal release. Romantic love can be modulated by antidepressants or recreational drugs. Polymorphism of dopamine and serotonin receptor relates to the romantic relationship. The effect of other monoamines is barely mentioned. Conclusions: Romantic love is vulnerable for secondary effect, such as drugs which modulate the dopamine and serotonin, in human. Romantic relationship is also impacted by the polymorphism of monoamine receptors. Therefore, the biological effect is not limited to sexual response cycle but also the romantic love and relationship. Further investigation is warranted for understanding the secondary effect in romantic love for romantic dissolution or divorce.
Anonymous and Unlinkable Membership Authentication with Illegal Privilege Transfer Detection  [PDF]
Sung-Ming Yen, Tsung-Min Kuo, Tzu-Yu Yang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2018, DOI: 10.4236/ijcns.2018.112002
Abstract: Anonymous authentication schemes, mostly based on the notion of group signatures, allow a group member to obtain membership from a server and gain access rights if the member can prove their authenticity to the verifier. However, existing authentication schemes are impractical because they neglect to provide an exclusive verification of the blacklist. In addition, the schemes are unaware of malicious members who are involved in privilege transferring. In this paper, a novel membership authentication scheme providing detection of membership transfer and proof of membership exclusiveness to the blacklist is proposed.
The Impact of a Pharmacist-Conducted Interactive Anti-Smoking Education Program on the Attitudes and Knowledge of High School Students  [PDF]
Man-Tzu Marcie Wu, Wan-Chen Shen, Juei-Chia Chang, Yi-Chun Chiang, Hsiang-Mei Chen, Hsiang-Yin Chen
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.47061
Abstract:

Introduction: Smoking among adolescents remains a major concern because of its long term health hazards. An effective adolescent-specific anti-smoking education is needed. Objectives: To measure the impact of a school-based tobacco prevention program provided by pharmacists on the attitudes and knowledge of senior high students. Methods: An anti-smoking program specifically aimed at high school students was developed by pharmacists and introduced to 354 students inTaiwan. It consisted of a role play and a lecture. The students were asked to complete a structural questionnaire right before and after the intervention. Results: After the intervention, the average of the total attitude scores increased from 41.7 to 43.2 (p = 0.001), and the total knowledge scores increased from 6.4 to 8.2 (p < 0.001). The average practice score was 31.2 (maximum score = 50) and the result suggested that the practice score was associated with attitude rather than knowledge. Conclusion: This pharmacist-conducted anti-smoking program for high school students resulted in positive changes regarding both attitude and knowledge. This suggests that further anti-smoking programs targeting students would be effective in helping to prevent youth smoking.

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