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매체 순환식 수소제조공정에 적합한 Fe2O3/ZrO2 산소전달입자에 구리 산화물 첨가가 미치는 영향에 관한 연구
이준규 ( Jun Kyu Lee ),김초균 ( Cho Gyun Kim ),배기광 ( Ki Kwang Bae ),박주식 ( Chu Sik Park ),강경수 ( Kyoung Soo Kang ),정성욱 ( Seong Uk Jeong ),김영호 ( Young Ho Kim ),주종훈 ( Jong Hoon Joo ),조원철 ( Won Chul Cho ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.3
매체 순환식 수소제조공정은 직접 고순도의 수소를 생산하는 동시에 CO2 포집 비용을 최소화할 수 있는 고효율/친환경적인 공정이다. 본 공정은 레독스 반응을 통하여 산소를 전달하고 이때 철 산화물계 산소전달입자를 이용하게 된다. 구리 산화물이 첨가된 철-구리 산화물계 산소전달입자는 반응성 향상이 보고되어 왔으나 철 산화물과 구리 산화물간 상호작용에 대한 이해가 부족한 실정이다. 본 연구에서는 여러 기기 분석법(SEM/EDX, XRD, BET, TPR, XPS, TGA)을 통하여 철-구리 산화물계 산소전달입자의 레독스 반응성 향상을 지배하는 주요인을 연구하였다. 첨가된 구리산화물은 철 산화물 성장 억제제 역할 뿐만 아니라 화학적 환경 변화를 일으키는 화학적 촉매제(chemical promoter)역할도 하는 것이 발견되었다. 철-구리 산화물계 산소전달입자의 우수한 환원 반응성은 구리 산화물의 도입으로 Fe2+농도 증가 및 표면 특성 변화 때문이며, 우수한 물분해 특성은 산화 과정에서 일어나는 철 산화물의 응집을 구리 산화물이 억제시킨 것으로 판단되었다. H2 production by chemical looping is an efficient method to convert hydrocarbon fuel into hydrogen with the simultaneous capture of concentrated CO2. This process involves the use of an iron based oxygen carrier that transfers pure oxygen from oxidizing gases to fuels by alternating reduction and oxidation (redox) reactions. The enhanced reactivities of copper oxide doped iron-based oxygen carrier were reported, however, the fundamental understandings on the interaction between Fe2O3 and CuO are still lacking. In this study, we studied the effect of dopant of CuO to Fe2O3/ ZrO2 particle on the morphological changes and the associated reactivity using various methods such as SEM/EDX, XRD, BET, TPR, XPS, and TGA. It was found that copper oxide acted as a chemical promoter that change chemical environment in the iron based oxygen carrier as well as a structural promoter which inhibit the agglomeration. The enhanced reduction reactivity was mainly ascribed to the increase in concentration of Fe2+ on the surface, resulting in formation of charge imbalance and oxygen vacancies. The CuO doped Fe2O3/ZrO2 particle also showed the improved reactivity in the steam oxidation compared to Fe2O3/ZrO2 particle probably due to acting as a structural promoter inhibiting the agglomeration of iron species.
한일철, 박명철, 박정세, 조재국, 정종훈, 이대성 한국대학선교학회 2007 대학과 선교 Vol.13 No.-
Christian colleges and universities strive to instill their students with the institution's founding Christian principles. Chapel services and Understanding Christianity courses are two most important tools in implementing this purpose. In the operation of the Understanding Christianity courses, which are usually required for all undergraduate students in the freshmen year, it is imperative that the Christian faith should be presented always in the context of the contemporary society. As a part of university's general education, Understanding Christianity courses have to make best efforts to present Christian faith look plausible in the academic and secular environment of the university. And they have to intelligently address issues relevant to various fields of colleges and departments. This study closely examines the survey which was conducted in June, 2006 at Yonsei University to assess the effect of "Understanding Christianity" courses. This study will show that there are tangible positive changes as a result of the operation of these courses. Particularly it will show that there are noticeable changes in students perception of Christianity, and in their moral judgment on various social issues.
박진수(Park Jin Su),박원빈(Park Won Bin),황금철(Hwang Keum Cheol) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 인덕티브 라인을 적용한 광대역 이중 타원 안테나를 제안한다. 단일 타원 구조의 안테나에 소형 타원을 추가하여 안테나를 소형화하였고, 인덕티브 라인을 적용하여 저주파 대역과 고주파 대역의 임피던스 개선을 하였으며 ISM, UWB 대역에서 동작하는 광대역 특성을 구현하였다. 제안된 안테나는 2.18~10 GHz 대역에서 –10 dB 이하 반사 계수 특성을 만족하며 동작 주파수 대역 내 안테나의 최대 이득은 1.74~3.78 dBi로 분포한다.
한약투여 및 식이, 운동지도를 통한 소아성장치료의 임상적 관찰
공재철 ( Jae Cheol Kong ),이정한 ( Jeong Han Lee ),고연석 ( Youn Seok Ko ),이유진 ( Eu Gene Lee ),나철 ( Cheol Na ),박단서 ( Darn Seo Park ),송용선 ( Yung Sun Song ),신병철 ( Byung Cheul Shin ) 한방재활의학과학회 2008 한방재활의학과학회지 Vol.18 No.3
Objectives : The aim of this study was to observe and analysis the effectiveness of clinical treatments on the growth of children treated with Korean herbal medicine (KHM). Methods : Forty-two children of growth retardation were evaluated from January 2007 to May 2008. All children were administered KHM with diet and exercise guidance. Height percentile and predictive height were calculated following the General Growth Statistics Result (2007), and compared those of pre-treatment with post-treatment. Results : Thirty-one of them were improved (73.8%) and eleven were not (26.2%). The mean growth rate was 7.2cm/yr for male and 6.8cm/yr for female. The mean growth percentile of male showed 7.6% improvement (p=0.003), female 4.4% respectively (p=0.036). The mean predictive height of male showed 2.2cm improvement (p=0.005), female 1.0cm respectively (p=0.007). Change of growth percentile and predictive height were significantly higher on period of prepuberty, and in small children below 50% of height percentile. About inter-relations between growth improvement and compliance of diet, exercise or medication, meaningful statistics were shown in diet control than the others (p=0.077). Diet compliance was in close connection with exercise, but others were not shown close correlations. Conclusions : These results showed that KHM showed promising results on children growth and healthy diet would be an important factor for growth of children. And it was recommended that KHM should be applied on period of prepuberty and smaller than average height.
공재철,박태용,고연석,원재균,박단서,신병철,Kong, Jae-Cheol,Park, Tae-Yong,Ko, Youn-Seok,Won, Jae-Kyun,Park, Darn-Seo,Shin, Byung-Cheul 척추신경추나의학회 2006 척추신경추나의학회지 Vol.1 No.1
Objectives : A rare case of dural tear ensuing after a cervical Chuna Manipulation Treatment leading to cerebrospinal fluid (CSF) leakage in the lower cervical and upper thoracic spine was found, so we report it. Methods : A 32-year-old woman presented with back and neck pain in 1 days earlier. The patient undertook a cervical Chuna Manipulation Treatment. After this maneuver, the patient complained of an orthostatic headache with nausea. The patient's headache worsened, and lying down gave the only measure of limited relief. In Brain CT and MRI study, nonspecific finding was detected. In Cistemography study, CSF leakage at lower cervical or upper thoracic area was detected. Results and Conclusions : It is supposed that this patient suffered a dural tear and CSF leakage secondarily due to a cervical Chuna Manipulation Treatment. From this case, we can understand the etiology of dural tear to some extent and consider the complication of Chuna Manipulation Treatment. In the future, more study, research and prospective trial for complications of a cervical Chuna Manipulation Treatment is needed.
연구논문 : 기독교 이해 과목의 효율적 운영에 관한 연구
한인철,박명철,박정세,조재국,정종훈,이대성 한국대학선교학회 2007 대학과 선교 Vol.13 No.-
Christian colleges and universities strive to instill their students with the institution``s founding Christian principles. Chapel services and Understanding Christianity courses are two most important tools in implementing this purpose. In the operation of the Understanding Christianity courses, which are usually required for all undergraduate students in the freshmen year, it is imperative that the Christian faith should be presented always in the context of the contemporary society. As a part of university``s general education, Understanding Christianity courses have to make best efforts to present Christian faith look plausible in the academic and secular environment of the university. And they have to intelligently address issues relevant to various fields of colleges and departments. This study closely examines the survey which was conducted in June, 2006 at Yonsei University to assess the effect of "Understanding Christianity" courses. This study will show that there are tangible positive changes as a result of the operation of these courses. Particularly it will show that there are noticeable changes in students perception of Christianity, and in their moral judgment on various social issues.