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Chronic intractable diarrhea caused by gastrointestinal mastocytosis
( Hyungil Seo ),( Sang Hyoung Park ),( Jeong-sik Byeon ),( Chang Gok Woo ),( Seung-mo Hong ),( Kiju Chang ),( Hoonsub So ),( Minseob Kwak ),( Wan Soo Kim ),( Jeong-mi Lee ),( Dong-hoon Yang ),( Kyung- 대한장연구학회 2016 Intestinal Research Vol.14 No.3
As mast cells have been highlighted in the pathogenesis of diarrhea-predominant irritable bowel syndrome, a new term “mastocytic enterocolitis” was suggested by Jakate and colleagues to describe an increase in mucosal mast cells in patients with chronic intractable diarrhea and favorable response to treatment with antihistamines. Although it is not an established disease entity, two cases have been reported in the English medical literature. Here, for the first time in Asia, we report another case of chronic intractable diarrhea caused by gastrointestinal mastocytosis. The patient was a 70-year-old male with chronic intractable diarrhea for 3 months; the cause of the diarrhea remained obscure even after exhaustive evaluation. However, biopsy specimens from the jejunum were found to have increased mast cell infiltration, and the patient was successfully treated with antihistamines.
Development and Evaluation of Gasket for Polymer Electrolyte Membrane Fuel Cell Stacks
서하규(Seo, Hakyu),한인수(Han, In-Su),정지훈(Jung, Jeehoon),김민성(Kim, Minsung),신현길(Shin, Hyungil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The design and fabrication of a metallic bipolar plate-gasket assembly for polymer electrolyte fuel cells (PEMFCs) is defined. This bipolar plate-gasket assembly was prepared by inserting a previously prepared bipolar plate in the specially designed gasket mold. For this aim, a proprietary fluoro-silicone based rubber was injected directly into the bipolar plate borders. Gaskets obtained like this showed the chemically / physically stable and the good sealibilty in typically operating PEM fuel cell conditions. And also, this bipolar plate-gasket assembly shows lots of advantages with respect to traditional PEMFCs stack assembling systems: useful application to automative stacking due to easy handling, reduced fabrication time, possibility of quality control and failed elements substitution. This bipolar plate-gasket assembly was evaluated in the short fuel cell stack and met the leakage requirement for normal operation both in short-term and in long-term operation. Especially, it was confirmed that this gasket could be applied successfully even in the high pressure FEM fuel cell systems(over 2.0 bar in absolute pressure).
서하규(Seo, Hakyu),한인수(Han, In-Su),정지훈(Jung, Jeehoon),김민성(Kim, Minsung),신현길(Shin, Hyungil),허태욱(Hur, Taeuk),조성백(Cho, Sungbaek) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The coated metallic bipolar plates are getting attractive due to their good feasibility of mass production, low contact resistance, high electrical/thermal conductivity, low gas permeability and good mechanical strength comparing with graphite materials. Yet, metallic bipolar plates for polymer electrolyte membrane(PEM) fuel cells typically require coatings for corrosion protection. Other requirements for the corrosion protective coatings include low electrical contact resistance between metallic bipolar plate and gas diffusion layer, good mechanical robustness, low mechanical and fabrication cost. The authors have evaluated a number of protective coatings deposited on stainless steel substrate by electroplating. The coated metallic bipolar plates are investigated with an electrochemical polarization tests, salt dipping tests, adhesion tests for corrosion resistance and then the contact resistance was measured. The results showed that the selective samples electroplated with optimized method, satisfied the DOE target for corrosion resistance and contact resistance, and also were very stabilized in the typical fuel cell environments in the long-term.