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Membrane performance comparison in a proton exchange membrane fuel cell (PEMFC) stack
김선회,Inkwon Hong 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.6
A 5-cell proton exchange membrane fuel cell (PEMFC) stack with different types of membrane electrode assemblies (MEAs) was tested to compare their performances and electrochemical characteristics. The experimental data were obtained with a stack of 5 cells and active area of 125 cm2. The stack consisted of different Nafion1 and hydrocarbon membranes with the same types of electrocatalyst. The membranes were installed in different cells and in the same stack. Polarization and voltage measurement data were obtained to compare their performances at different temperatures and anode humidity conditions. Also,impedance spectroscopy data were obtained in similar manner to compare the differences in their resistance. 2010 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Effects of humidity and temperature on a proton exchange membrane fuel cell (PEMFC) stack
김선회,Inkwon Hong 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.3
Various operation conditions such as fuel and oxidant humidity and stack temperature were evaluated in order to improve the performance of proton exchange membrane fuel cell (PEMFC). Under the experimental environment, the resultant data were obtained with a stack of 10cm² active area and 10 cells. The humidity was strongly dependent on the temperature of anode and cathode as well as stack temperature change. Compared to anode humidity, the stack performance of PEMFC was more affected by cathode humidity and increased with increasing cathode humidity. In the viewpoint of stack performance, the stack temperature was less influenced than humidity.
Ko, Seok-Jae,Park, Jae-Woo,Lee, Jae-hyung,Lee, Jung-eun,Ha, Na-yeon,Nam, Seong-uk,Lee, Jae-hong,Jeon, Soo-Hyung,Kim, Jong-Won,Kang, Changwan,Yeo, Inkwon,Kim, Jinsung Hindawi 2018 Evidence-based Complementary and Alternative Medic Vol.2018 No.-
<P><B>Introduction</B></P><P> Functional dyspepsia (FD) is a functional gastrointestinal disorder characterized by persistent upper dyspeptic symptoms without organic lesions. There is no standard therapy for FD. Yukgunja-tang (YGJT) is an herbal medicine used for treating upper gastrointestinal symptoms in Asia. Studies on the effect of YGJT on FD have been conducted. However, the results were inconsistent. In<I> Hyungsang</I> medicine, traditional Korean medicine, FD patients are classified into bladder body (BB) or gallbladder body (GB) subtypes by the shape and angle of their faces. Each subtype may have different characteristics, physiology, and pathology of the same disease. YGJT is more effective for patients with BB subtype. The three-dimensional facial shape diagnostic system (3-FSDS) was shown to be effective in diagnosing BB or GB subtypes. This study aimed to investigate the effect of YGJT on FD patients classified using the 3-FSDS.</P><P><B> Materials and Methods</B></P><P> The current study was a placebo-controlled, double-blinded, randomized, two-center trial. Eligible patients were diagnosed with either BB or GB FD subtype using the 3-FSDS. Ninety-six participants (48 BB and 48 GB subtypes) were randomly allocated to treatment or control groups in a 2:1 ratio. YGJT or placebo was administered for eight weeks. The primary outcome was assessed using the total dyspepsia symptom scale (TDS), while the secondary outcomes were assessed using the single dyspepsia symptom scale (SDS), proportion of responders, visual analog scale, Nepean dyspepsia index, functional dyspepsia-related quality of life, and spleen qi deficiency questionnaire.</P><P><B> Results and Discussion</B></P><P> The result of TDS showed the superior effect of YGJT on BB over GB subtype. The subgroup analysis of TDS and SDS scores showed the superior effect of YGJT over placebo. Other outcome variables did not show any significant differences between groups.</P><P><B> Conclusion</B></P><P> YGJT may be considered for FD patients diagnosed with BB subtype using 3-FSDS.</P>