제조물책임법의 해석론적 연구

윤정환 昌原大學校社會科學硏究所 2003 사회과학연구 Vol.10 No.-

축소된 브랜치라인 하이브릿드 커플러를 이용한 아날로그 이상기 ( Phase Shifter ) 의 설계 ( Analog Phase Shifter Design Using Reduced-Size Branch-line Hybrid Coupler )

윤정환,주창복 대한전자공학회 1996 대한전자공학회 학술대회 Vol.1996 No.1

Variation of Gold Content in Rocks and Minerals from the Seongsan and Ogmaesan Clay Deposits in the Haenam Area, Korea

윤정환,Yoon, Chung-Han The Korean Society of Economic and Environmental G 1995 자원환경지질 Vol.28 No.6

한국 남서부에 위치한 해남지역에는 산성마그마 활동에 수반된 acid-sulfate 점토광상들이 산출되고 있다. 연구지역의 지질은 응회암, 화강암질암, 석영반암, 유문암, 안산암 및 퇴적암으로 구성되어 있으며 화강암질암과 석영반암은 응회암과 퇴적암을 관입하며 광산주변의 유문암과 응회암은 열수변질을 받았다. 채취된 시료중 67개의 시료를 GFAAS와 ICP로 주성분 원소함량과 금을 비롯한 미량원소함량을 분석한 결과 금은 성산광산에서 산출되는 명반석맥과 규화작용을 심하게 받은 변질대에서 부화된 반면 dickite와 dickite가 함유된 암석이나 광석이 열수변질을 받은 경우에는 결핍된 경향을 보여주며, 특히 단층주변과 단층들이 교차하는 지점에서 금함량이 높은 경향을 나타낸다. 명반석-석영-황철석이 공생하는 명반석이나 명반석맥에서는 금함량이 높으나 황철석을 포함하는 응회암과 dickite에서는 일반적으로 금함량이 낮은 경향을 보여준다. 규화작용을 받은 응회앙에서 금함량은 As, Hg 및 Hg와 정의 상관관계를 보여 주며 대부분의 시료에서 Cd, Hg 및 Sb함량변화는 금함량변화와 유사한 경향을 나타낸다. 따라서 이 연구지역에서 지질학적 및 지구화학적으로 금광상을 탐사하기 위해서는 단층이 교차하는 지점의 silicified zone 또는 황철석을 함유하는 명반석맥을 찾아서 As, Hg 및 Sb 등과 같은 지시원소를 분석하는 것이 중요할 것으로 판단된다. Several acid-sulfate clay deposits associated with silicic magmas occur in the Haenam area of the southwestern part of Korea. Geology of the studied area consists of tuffs, granitic rocks, quartz porphyry, rhyolite, andesite and sedimentary rocks. The granitic rocks and quartz porphyry intruded tuffs and sedimentary rocks. The rhyolite and tuffs around the mines have undergone hydrothermally weak or strong alteration. Gold contents with major and trace elements have been determined for a total of sixty-seven specimens of fresh igneous rocks, wall rocks and minerals such as dickite and alunite by graphite furnace atomic absorption spectrometer and inductively coupled plasma. Gold is enriched in the alunite vein and the silicified zone, but is depleted in dickites and hydrothermally altered rocks with dickite of the Seongsan deposit. Gold is especially concentrated near the faults or conjunction area of two faults. High content of gold is shown in the mineral assemblages of alunitequartz- pyrite in the alunite vein and silicic zone of the Seongsan deposit compared with that of minerals and rocks from another deposits distributed in the studied area. Gold content in tuffs and dickites with pyrite is generally low. Gold content in silicified tuff tends to show positive correlations with content of As, Hg and Sb. Variation trends of Cd, Hg and Sb are similar to those of gold content. From the result of gold content variations, gold may be transported and concentrated by mineralizing solutions ascending along the cracks like fault. Therefore, it is important to survey alunite vein and silicified zone at the conjunction of faults, and to analyze pathfinder elements such as As, Hg and Sb for geological and geochemical exploration of gold in the studied deposits.

농축폐액 분말의 정제 제조를 위한 연구

윤정환,김재건,차승영 한국방사성폐기물학회 2009 한국방사성폐기물학회 학술논문요약집 Vol.7 No.1

Cholangiocarcinogenesis

윤정환 대한췌담도학회 2004 대한췌담도학회지 Vol.9 No.1

현장 사용자 관점에서의 건설 정보시스템 만족도 분석

윤정환,윤수원,진상윤,김예상,Yoon, Jeong-Hwan,Yoon, Su-Won,Chin, Sang-Yoon,Kim, Yea-Sang 한국건설관리학회 2006 건설관리 : 한국건설관리학회 학회지 Vol.7 No.4

대부분의 대형 건설기업은 정보화의 일환으로 건설현장의 관리 효율화를 위해 건설 정보시스템을 개발하여 건설현장에 적용하고 있다. 하지만 이러한 건설 정보시스템은 도입과정에서 반드시 수행되어야 하는 실무자 요구사항에 대한 반영은 미흡한 상태에 있으며, 실제 사용자의 자발적 참여가 부족한 상태에 있다. 따라서 본 연구는 10개 건설기업 현장을 대상으로 사용자 관점에서의 설문조사와 인터뷰를 실시하여 현재 구축되어져 있는 건설 정보시스템의 기능 현황 및 건설 정보시스템에 대한 전반적인 만족도, 건설 정보시스템이 가지고 있는 기능에 대한 구축수준 만족도에 대한 분석을 하였으며, 이를 통하여 전설 정보시스템에 대한 건설현잔 사용자들의 전반적인 만족도와 건설정보시스템이 가지고 있는 기능에 대한 만족도를 분석하여 앞으로 건설정보화 시스템이 나아가야 할 방향을 제시하고자 하였다. Most of large construction companies have developed construction information systems and their ultimate goals should be improvement of the management efficiency of the construction projects. In order to make them successful, the systems should be designed to meet system users' needs Therefore purpose of this study is to evaluate the current information management systems from the viewpoint of the system users, especially on-site engineers. Questionnaire surveys and interviews have been conducted for the highly ranked 10 construction companies on four major factors including the functions of the systems and satisfaction level of each function, recognition of the use effect, informatization support. From the surveys results, correlation between the functions of the systems and the others has been statistically analyzed.

Er:YAG fractional laser로 치료한 Dowling-Degos병

윤정환,김지훈,최준석,강홍규,백진옥,노주영,이종록 대한피부과학회 2012 대한피부과학회 학술발표대회집 Vol.64 No.1

歸國事業' 반세기의 沈黙을 旅行하다

尹晸煥 한일민족문제학회 2008 한일민족문제연구 Vol.15 No.-

Seven-year Survival Rate of On-line Hemodiafiltration

윤정환,김남호 대한의생명과학회 2019 Biomedical Science Letters Vol.25 No.1

Conventional high-flux hemodialysis (HD) is not as good as normal kidney function. Morbidity and mortality rates of patients receiving HD are still very high. To increase mid-to-large molecule clearance by combining diffusion and convection, on-line hemodiafiltration (HDF) is required. The objective of this study was to compare long-term survival rate of patients treated with on-line HDF to those who received conventional high-flux HD by reviewing data from Chonnam National University Hospital (CNUH). We selected patients who attended the 'CUNH dialysis center' and agreed to participate in the study. Overall, 40 patients with ESRD switched from high flux HD to on-line HDF or started on-line HDF from August 2007 to December 2009. Additionally, a total of 42 patients receiving conventional high-flux HD during the same period were enrolled. We then reviewed long-term survival rate of patients receiving on-line HDF over the next seven years. When we compared survival rates for seven years, the survival rate of the group receiving on-line HDF was 65% (26/40) while that of the group receiving the conventional high-flux HD was 54.8% (23/42). Although the number of patients was small to see survival difference clearly by one specific dialysis modality, there was somewhat difference in survival rate between the two groups. Indicators such as anemia, calcium-phosphate metabolism, nutritional status, treatment adequacy, and hospitalization were also improved in the group receiving HDF. Overall, results of our study showed beneficial effects of on-line HDF on clinical outcomes and survival in chronic HD patients.

Lack of association of SCN2A and KCNJ10 polymorphisms in Korean children with epilepsy: intractability and relapse of epilepsy

윤정환,최병준,박용규,Young Hwi Kang,남석우,이정용,박원상 대한독성 유전단백체 학회 2012 Molecular & cellular toxicology Vol.8 No.1

Epilepsy is characterized by recurrence of unprovoked seizures and can be defined as a channelopathy. Recently, it has been reported that susceptibility to epilepsy and responsiveness to antiepileptic drugs was closely associated with polymorphisms in SCN2A and KCNJ10. In order to investigate whether the association was also present in Korean children with epilepsy, the frequencies of the polymorphisms were examined in 162 pediatric epilepsy patients and 391 healthy children. The genotype and allele frequencies of SCN2A R19K and IVS7-A32G showed no significant differences in the genotype and allele frequencies between epilepsy patients and healthy controls (P¤0.05). For KCNJ10 R271C, only the C/C genotype was observed in both normal healthy individuals and epilepsy patients. When we classified the patients into relapse and intractable groups, we found that the genotype and allelic frequencies of SCN2A IVS7-A32G and SCN2A R19K were not associated with the recurrence of epilepsy. Therefore, we concluded that the polymorphisms of SCN2A and KCNJ10 genes may not contribute to the development or intractability and relapse of epilepsy in Korean children.