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고분자전해질 연료전지 열화 분석방법에 의한 PEM 수전해 열화 평가
오소형 ( Sohyeong Oh ),양진원 ( Jinwon Yang ),추천호 ( Cheun-ho Chu ),나일채 ( Il-chai Na ),박권필 ( Kwonpil Park ) 한국화학공학회 2021 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.59 No.1
PEM(Proton Exchange Membrane) 수전해는 PEM 연료전지와 동일한 PEM 전해질 막을 사용하며, 동일한 반응이지만 방향이 반대인 반응에 의해 진행된다. PEM 연료전지는 전해질 막과 촉매의 열화와 내구성에 대해 많은 연구가 진행되어 개발된 열화분석 방법이 많다. 본 연구에서 PEM 수전해 내구성 평가에 PEM 연료전지 내구성 평가 방법 적용이 가능한지 검토하였다. PEM 수전해 열화과정에서 PEM 연료전지와 동일한 조건으로 LSV(Linear sweep voltammetry), CV(Cyclic voltammetry), Impedance, SEM(Scanning Electron Microscope), FT-IR(Fourier Transform Infrared spectroscopy) 등을 분석해 비교하였다. PEM 연료전지처럼 막을 통과한 수소가 Pt/C 전극에서 산화되어 수소투과전류밀도를 측정함으로써 PEM 수전해 고분자 막의 열화정도를 분석할 수 있었다. 수소/질소 유입 조건에서 CV에 의한 전극활성면적(ECSA)을 측정해 전극열화를 분석할 수 있었다. 수소와 공기를 Pt/C 전극과 IrO<sub>2</sub> 전극에 공급하면서 각 전극의 임피던스를 측정해 전극과 고분자 막의 내구성을 평가할 수 있었다. The PEM(Proton Exchange Membrane)water electrolysis uses the same PEM electrolyte membrane as the PEM fuel cell and proceeds by the same reaction but the opposite direction. The PEM fuel cell has many methods of degradation analysis since many studies have been conducted on the degradation and durability of the membrane and catalyst. We examined whether PEM fuel cell durability evaluation method can be applied to PEM electrolytic durability evaluation. During the PEM electrolytic degradation process, LSV(Linear sweep voltammetry), CV(Cyclic voltammetry), Impedance, SEM(Scanning Electron Microscope) and FT-IR(Fourier Transform Infrared spectroscopy) were analyzed and compared under the same conditions as the PEM fuel cell. As the PEM fuel cell, hydrogen passing through the membrane was oxidized at the Pt/C electrode, and the hydrogen permeation current density was measured to analyze the degree of degradation of the PEM membrane. Electrode degradation could be analyzed by measuring the electrode active area (ECSA) by CV under hydrogen/nitrogen flowing conditions. While supplying hydrogen and air to the Pt/C electrode and the IrO<sub>2</sub> electrode, the impedance of each electrode was measured to evaluate the durability of the electrode and membrane.
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Mixed gonadal dysgenesis in 45,X Turner syndrome with SRY gene
정재엽,양소형,정은환,이호창,이영문,한현석,이경희 대한소아내분비학회 2016 Annals of Pediatirc Endocrinology & Metabolism Vol.21 No.3
Turner syndrome is the most common chromosomal disorder in girls. Various phenotypic features show depending upon karyotype from normal female through ambiguous genitalia to male. Usually, Turner girls containing 45,X/46,XY mosaicism, or sex-determining region Y (SRY) gene may have mixed gonadal dysgenesis with various external sexual differentiation. We experienced a short statured 45,X Turner girl with normal external genitalia. Because SRY gene was positive, laparoscopic gonadectomy was performed. The dysgenetic gonads revealed bilateral ovotesticular tissues. The authors report a mixed gonadal dysgenesis case found in clinical 45,X Turner patient with positive SRY gene. Screening for SRY gene should be done even the karyotype is 45,X monosomy and external genitalia is normal.
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이윤경,양소형,박주현,김헌,한윤수 대한소아청소년과학회 2015 Clinical and Experimental Pediatrics (CEP) Vol.58 No.3
Purpose: House dust mite (HDM) has been suggested to be the most important aeroallergenresponsible for atopic asthma in Korea. We aimed to investigate that specific IgE antibodies to HDMand other common indoor aeroallergens contribute differently to total serum IgE and show differentrelationships with longitudinal fractional exhaled nitric oxide (FeNO) measurements in Korean atopicasthmatic patients. Methods: A total of 193 children aged 8 to 16 years with intermittent or mild persistent atopic asthmawere recruited. Sera were assayed for total IgE and specific IgE antibodies to HDM and other commonindoor allergens. FeNO was serially measured 10 times or more over 2 years when subjects were notreceiving controller medications. Results: In 152 children who completed the study, IgE antibodies to specific HDM were more prevalentthan those to other common indoor aeroallergens. In addition, IgE antibody titers to HDM werethe strongest contributor to total IgE increases. Furthermore, only HDM-specific IgE antibody titersignificantly correlated with maximum FeNO (r=0.21, P=0.029) and the rate of FeNO higher than 21parts per billion (ppb) (r=0.30, P=0.002). Eight patients (5%) were found to have maximum FeNO of21 ppb or less, suggesting the presence of a low FeNO phenotype among atopic asthmatic patients. Conclusion: The quantity of HDM-specific IgE antibody provides a possible explanation for increasesof total IgE and significantly correlates with the amount and frequency of FeNO increases in Koreanatopic asthmatic patients.
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PEM 수전해 막전극합체(MEA)의 제법에 따른 내구성 비교
유동근,이선인,양진원,오소형,박권필 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
PEM(Proton Exchange Membrane) 수전해는 양성자 교환막을 사용해 물을 전기분해하여 양극에서는 산화반응이 일어나 산소가 발생하고, 음극에서는 환원 반응이 일어나 수소가 발생한다. PEM 수전해는 순수한 물을 원료로 하기 때문에 수소의 순도가 매우 높고 온실가스나 오염물질 없이 수소를 생산할 수 있어서 청정기술로 각광받고 있지만 수명이 짧다는 문제점을 가지고 있다. 현재 신재생에너지의 과잉 전기를 수소로 저장하기 위한 방법으로 수전해에 대하여 많은 연구가 진행되고 있지만, 내구성에 대한 연구가 아직 부족한 실정이다. 본 연구에서는 MEA제법에 따른 PEM 수전해 내구성에 대해 연구하였다. 데칼방법과 스프레이 방법으로 제조한 MEA의 내구성을 비교하였다. 내구성 평가조건으로 온도와 전압을 변화시키면서 고분자막과 전극의 열화정도를 분석하였다. PEM 수전해 MEA 열화는 가속내구평가 과정에서 I-V, Impedance, CV, IEC, SEM 등을 이용해 분석했다. 스프레이 방법으로 제조한 MEA의 전극 내구성이 데칼방법으로 제조한 MEA보다 우수함을 보였다.
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Yeong Ju Yun,Yun Hee Gyon,양소형,이윤경,박주현,박미림 대한소아청소년과학회 2015 Clinical and Experimental Pediatrics (CEP) Vol.58 No.12
Purpose: To determine the efficacy and safety of oral propranolol as a first-line treatment for superfi- cially located infantile hemangioma (IH) and propose an assessment tool to measure treatment response. Methods: Patients with superficial IH under 1 year of age were prospectively recruited between May 2012 and December 2013 at the Department of Pediatrics of Chungbuk National University Hospital. Propranolol was administered to 12 infants (median age, 3.8 months) while monitoring cardiovascular and adverse metabolic effects. If a patient showed no adverse events, the dosage was gradually increased up to 3 mg/kg/day and maintained for 1 year. We used our own scoring system to assess treatment response using parameters like change in color, and longest diameter, and thickness of the IH. Results: Eleven out of 12 patients completed the protocol with consistent improvement of hemangio- mas during therapy. Patients on propranolol showed a more than 50% involution in the first 3 months, with additional steady involution until 1 year. Patients with the highest scores at 1 month maintained their score and showed better responses until treatment termination. The patient with the lowest score at 1 month did not show any further regression and stopped propranolol treatment 4 months after initiation. In two children with recurrences after successful therapeutic regression, propranolol was effective after being reintroduced. Propranolol treatment was not interrupted in any patient due to adverse events. Conclusion: Oral propranolol at 3 mg/kg/day showed a consistent, rapid, and therapeutic effect on superficial IHs without significant adverse events.
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