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여인환,Yeo. In Hwan 한국방재학회 2012 한국방재학회논문집 Vol.12 No.6
본 연구는 현재 법정내화구조로 규정되어 있는 철근콘크리트조, 철골철근콘크리트조 및 철골철망모르타르조 슬래브에 대하여 재하조건에서의 내화성능을 검토함으로써 관련 규정의 분류체계 개선을 위한 자료 구축을 목적으로 하였다. 실험결과를 요약하면 다음과 같다. (1) 피복두께 40 mm의 경우 철근콘크리트조, 철골철근콘크리트조, 철골철망모르타르조의 변형량은 허용기준 대비 40~44%, 피복두께 50 mm의 경우는 34~37%로 유사한 수준의 내화성능을 보이는 것으로 나타나, 동일 피복의 경우 구조형식에 따른 내화성능 차이는 크지 않은 것을 확인하였다. 다만 근소한 차이로 철근콘크리트조, 철골철근콘크리트조, 철골철망모르타르조의 순으로 내화성능이 우수한 것으로 나타났다. (2) 슬래브 피복두께가 10 mm 증가하면 철골철근콘크리트조의 경우 8%, 철골철망모르타르조의 경우는 7%의 내화성능이 향상되는 것으로 나타났다. 이로써 슬래브의 내화성능은 피복두께와 전체 두께에 비례하여 증가하며, 구조형식의 영향은 거의 없는 것을 확인하였다. (3) 슬래브의 차열성능은 구조형식이나 피복두께의 영향보다는 전체 두께가 증가할수록 향상되었다. 하지만 슬래브 두께 200 mm이상에서는 두께가 증가하여도 차열성능에 미치는 영향이 없는 것으로 나타났다. This study aimed to secure the test data for improving the classification scheme of related regulations about fire resistant slabs by testing the structural member of RC, SRC and SWM slabs which legally prescriptived. Test result may be summerised as follows. (1) In the equal thickness condiion of covering, the deflection of specimen of RC, SRC and SWM showed to have equivalent performance at the rate of 40~44% in the case of 40 mm, 34~37% of 50 mm to the proportion of allowed criteria. It can be placed in order, however, RC, SRC and SWM as a view of fire resisting rate. (2) An increase of 10mm cover thickness of slab lead to the fire resisting rate up to 8% and 7% in SRC and SWM, respectively. This showed that the fire resisting rate increases in proportion to the cover and whole thickness, with few influenced by structural type. (3) The insulation performance of slabs improved by increasing whole thickness, with few influenced by structural type or covering thickness, but in the case of over the 200 mm of thickness of slab it was not further improved.
Bladder injury with vesicocutaneous fistula following acupuncture: a case report
여인환,이동언,김창호,김윤정,서준석 대한응급의학회 2021 大韓應急醫學會誌 Vol.32 No.5
Acupuncture is globally practiced extensively, especially in Northeast Asian countries. We present a case of bladder injury with vesicocutaneous fistula (VCF) subsequent to acupuncture treatment on the lower abdomen. We believe that no similar case has been reported in previous literature. A 54-year-old woman was admitted to our emergency department, complaining of lower abdominal pain with erythema, after undergoing acupuncture. Physical examination revealed swelling with erythema and slight pus-like discharges in the lower abdomen, with accompanying tenderness over the area of the swelling. An abdominal computed tomography showed evidence of bladder injury with VCF and abscess. Considering the underlying disease and the risk of surgical treatment, the patient was successfully treated with percutaneous abscess drainage and an indwelling urinary catheter. Considering the outcome of this case, we recommend that practitioners need to perform acupuncture treatment with sufficient anatomical knowledge and proper technique, to reduce the possibility of subsequent complications.
스핀 도핑을 이용한 단결정 실리콘 태양전지 확산 공정 최적화
여인환,박주억,김준희,조해성,임동건,Yeo, In Hwan,Park, Ju Eok,Kim, Jun Hee,Cho, Hae Sung,Lim, Donggun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.5
Rapid thermal processing (RTP) abruptly decreases the time required to perform solar cell processes. RTP were used to form emitter of crystalline silicon solar cells. The emitter sheet resistance is studied as a function of time and temperature. The objective of this study is reduction of doping process time with same performance. Emitter difRapid thermal dfusion was carried out by using a spin on doping and a RTP. iffusion was performed in the temperature range of $700{\sim}750^{\circ}C$ for 1m 30s~15 m. Thermal budgets yielded a $50{\Omega}/sq$ emitter using a P509 source. To reduce process time and get high efficiency, rapid thermal diffusion by IR lamp was employed in air atmosphere at $700^{\circ}C$ for 15 m.
Collateral effect of the COVID-19 pandemic on emergency department visits in Korea
여인환,김종근,( Byunghyuk Yu ),( Kang-suk Seo ),( Jung-bae Park ),( Yeonjoo Cho ),( Jae Young Choe ),( Changho Kim ),( Yun Jeong Kim ),( Dong Eun Lee ),( In Hwan Yeo ),( Won-kee Lee ) 대한응급의학회 2022 대한응급의학회 학술대회초록집 Vol.2022 No.2
여인환,김윤정 대한응급의학회 2021 Clinical and Experimental Emergency Medicine Vol.8 No.3
Pneumatosis intestinalis (PI) can be classified into two groups. Primary PI is idiopathic, and patients can recover spontaneously. In contrast, secondary PI is considered fatal due to the high mortality rate associated with mesenteric ischemia. Herein, we describe two patients with PI and concurrent pneumoperitoneum. Both patients were receiving targeted anticancer therapy, yet neither developed abdominal pain nor fatal symptoms. One of the patients underwent surgery, while the other was managed conservatively. Even though there were no complications, the patient who underwent surgery was hospitalized for 34 days, whereas the one who was managed conservatively was hospitalized for only five days. Usually, patients with cancer receiving chemotherapy are immunosuppressed and susceptible to infections. Therefore, based on the patients’ clinical features, surgical management of patients with cancer who develop PI after receiving anticancer chemotherapy should be done prudently.