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PEMFC용 복합소재 분리판을 위한 2단계 제조공법의 제조 조건에 대한 연구
허성일(Heo, Seong-Il),오경석(Oh, Kyeong-Seok),윤진철(Yun, Jin-Cheol),양유창(Yang, Yoo-Chang),한경섭(Han, Kyung-Seop) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The 2-step manufacturing method consisting of preforming and stamping processes was developed to manufacture composite bipolar plates for PEMFCs. The preform was composed of expanded graphite, graphite flake and phenol resin. Precuring conditions were optimized by checking the electrical conductivity, flexural strength and microstructure. Precuring temperature (100?C) slightly above the melting point of phenol powders (90?C) induced moderate curing, but also prevented excessive curing. Preforms utilizing the tangled structure of expanded graphite were easily fabricated at low pressure of 0.07-0.28MPa. The proper precuring time, 5min, was determined to fabricate the preform stably because insufficient and excessive precuring deteriorated the flexural strength of composite bipolar plates.
일부 지역 노인의 주관적 구강건조감과 인지기능장애평가의 관련성
허성은(Seong-Eun Heo),장경애(Kyeung-Ae Jang),김유린(Yu-Rin Kim),강현경(Hyun-Kyung Kang) 한국구강보건과학회 2021 한국구강보건과학회지 Vol.9 No.2
Objectives: The purpose of this study was to determine the relevance of cognitive impairment assessment due to subjective oral dry symptoms in older adults. Methods: After a three-month survey of patients visiting some dental hospitals in Busan from December 2019, the final 111 people were analyzed using the SPSS 26.0 program. Results: Groups with high subjective mouth dryness showed higher levels of cognitive dysfunction than those with lower subjective mouth dryness(<.001), and subjective mouth dryness showed a static correlation with the evaluation of cognitive dysfunction(r=.338, p<.01). Conclusions: Therefore, this study is considered to be a meaningful study that approaches the elderly s health problems in the aged society from various angles, and it is intended to be used as a basic data for the development of elderly health prevention programs as well as the prevention of geriatric diseases.