스타인메츠결선 자기여자 유도 발전기의 커패시턴스 결정

강상수,좌종근 제주대학교 공과대학 첨단기술연구소 2007 尖端技術硏究所論文集 Vol.18 No.-

This paper describes a simple and straightforward method for determining the minimum capacitance required to self excitation in a three-phase induction generator with Steinmetz connection. Using the input impedance of the induction generator and the self-excitation condition, the capacitance is computed by real and imaginary function in an application software. This solution method is applied to determine the capacitance required to maintain the specified terminal voltage when the generator is supplying load. The computed results are compared with Chan and Lai's results to verify the proposed method.

진양호 수질의 영양상태 평가에 관한 연구

강민수,김성우,이동근 경상대학교 환경보전연구소 1999 環境保全硏究所報 Vol.7 No.-

The purpose of this study was to assess trophic state of Chinyang Lake using monthly water quility data in 1998, and to suggest adequate protection method of water supply source. The results of water quality variations and trophic states were evaluated as follows; 1. Algae had rapidly grown from June, and this resulted in the increase of pH, Chlorophyll-a and COD. 2. The annual average ratio of COD by algal biomass to total COD was estimated to be 12% and had the highest value of 31.6% in June. 3. The ration of T-N/T-P was 53.7, and phosphorus became the liming factor for the eutrophication. 4. When considering T-P and Chlorophyll-a concentration, Chinyang Lake seems to be eutrophic state. 5. From the evaluation by TSI & LTSI methods, Chinyang Lake could become rapidly into eutrophic state.

사범대학 영어 강의에 대한 학생들의 인식 및 만족도 조사

강순희,서혁,신상근,이종원,이현주,최진영 이화여자대학교 교과교육연구소 2007 교과교육학연구 Vol.11 No.2

이 연구는 교사교육의 국제화를 지향하는 사범대학 특성화 프로그램 개발을 위한 기초 조사 차원에서 2007학년도 1학기에 146명의 사범대학 학생들을 대상으로 전공 영어 강의에 대한 인식과 만족도 등에 대해 설문조사의 방법으로 이루어졌다. 학생들의 영어 능력에 대한 자기 평가 결과, 대부분의 학생들이 자신의 영어 능력이 영어 강의 수강에 부족하고, 영어 강의에 대한 심리적 부담이 크다는 반응을 나타냈다. 또 영어 강의가 한국어 강의에 비해 전공 지식을 쌓는 데 도움이 되었다는 반응은 이공계를 중심으로 한 기존의 연구 결과보다 상대적으로 낮게 나타나는데, 이는 사범대학 영어 강의의 운영과 관련하여 좀 더 다양하고도 효과적인 방안이 고려되어야 함을 시사한다. 영어 강의 수강 시 어려움을 묻는 질문에서 과제 발표하기, 질문하기, 보고서 작성하기의 순으로 어려움을 호소하고 있는데, 이 역시 영어 강의를 위해서는 전반적인 영어 표현 및 이해 능력 향상 이 전제되어야 하며 무엇보다도 말하기, 듣기의 구어 능력 신장이 우선되어야 함을 재확인해 준다. 영어 강의 개선안에 대한 의견으로는 평가 방법의 다양성 및 융통성 확대, 영어 강의 수강을 돕는 전공 교재의 개발, 영어 강의 내에서의 교수-학생 상호 작용 증대, 국제교류의 기회 확대 등의 순으로 높은 반응을 보였다. 이는 향후 사범대학 영어 강의와 관련한 프로그램 개발에 시사하는 바가 크다. 즉, 영어 강의 평가를 결과 중심의 평가뿐만 아니라 과정평가와 수행평가에 초점을 두고, 영어 표현이 어려운 복잡한 사고 과정이 요구되는 경우 제한적으로 국문 반응을 허용하는 방안도 고려할 만하다. 또한 학습자들에게 좀 더 상세화된 강의 교재를 제공하고, 온·오프라인을 모두 활용하여 교수와 학생의 상호작용을 활성화할 수 있는 방안을 적극적으로 탐색할 필요가 있다. 아울러 학생들이 실질적인 국제교류가 가능하도록 다양한 교류 방안 함께 구체적인 강좌 개설도 요구된다.

환경 인쇄물 기반 어휘 활동이 초등학교 영어 학습자의 어휘 학습 결과와 정의적 태도에 미치는 영향

강은정,신상근 이화여자대학교 교과교육연구소 2017 교과교육학연구 Vol.21 No.5

This study investigates the effects of environmental prints on vocabulary learning of Korean Elementary School English language learners and their perspectives on vocabulary learning. The participants were 107 elementary school students in Kyunggi province, and they were divided into two groups. The students in both groups participated in vocabulary learning activities based on different materials, which were environmental prints and photos, respectively. The results of the post-test and delayed post-test showed that the students in the environmental prints group learned significantly more vocabulary items than the students in the photos group. The analyses of the students’ responses to the questionnaire revealed that the environmental print group had shown significant progress in interests and confidence in vocabulary learning. The results also showed that the students believed that they may be able to use the target words in their lives, indicating that environmental prints enhanced the situational authenticity of vocabulary instruction. These results suggest that environmental prints are useful instructional materials for vocabulary teaching in elementary school English instruction. 본 연구의 목적은 환경 인쇄물을 활용한 어휘 학습 활동이 초등학교 영어 학습자의 어휘 학습 결과와 어휘 학습에 대한 태도에 미치는 영향을 알아보는 데 있다. 환경 인쇄물은 학습자가 실생활에서 쉽게 접할 수 있고 목표 어휘에 대한 맥락을 제공하며 학습자의 학습동기를 높일 수 있어서 모국어 교육에서는 많이 활용되지만 제2 언어 어휘 교육에서는 상대적으로 많이 활용되지 않고 있는 실정이다. 본 연구는 환경 인쇄물이 영어를 외국어로 배우는 환경에서 초등학교 어휘 학습에 유용한 교수 자료인지 알아보고자 한다. 이를 위하여 본 연구에서는 초등학교 6학년 학습자를 대상으로 초등학교 어휘 교수에서 많이 사용되고 있는 사진 자료를 사용해서 어휘를 학습한 집단과 환경 인쇄물을 활용한 어휘 학습 집단으로 나누어 총 60개의 어휘를 교수한 후 학습 결과와 학습자의 정의적 태도를 비교하였다. 연구 결과 환경 인쇄물을 활용한 집단이 사진을 활용하여 어휘를 학습한 집단보다 통계적으로 유의미한 수준에서 어휘를 더 많이 학습한 것으로 나타났다. 어휘 학습에 대한 흥미와 자신감, 그리고 어휘 학습의 중요성에 대한 학습자의 반응을 비교한 결과 자신감 영역에서 환경 인쇄물 집단의 점수가 사진 집단의 점수보다 더 높았다.

파손된 치면열구전색제의 수리 방법에 따른 미세누출 비교

강명봉,현홍근,김영재,김정욱,장기택,이상훈,한세현,김종철 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.2

치면열구전색은 수 십년간 교합면 우식의 예방에 가장 효과적인 방법 중 한가지로 알려져 왔다. 하지만 치면열구전색제의 마모와 파절 때문에 치면열구전색제의 재시술 또는 수리를 필요로 하게 되었다. 본 연구의 목적은 파손된 치면열구전색제를 수리할 때 치질과 잔여 전색제의 표면처리 방법에 따른 미세누출 차이를 알아보고자 하는 것이다. 120개의 영구 대구치에 치면열구전색제를 적용하고 인위적인 파손을 만든 뒤 인공타액에 4주 동안 보관하였다. 4주 후 근심 또는 원심의 치면열구전색제가 완전히 파손 양상을 나타내는 치아 60개를 선택하여 각각 15개씩 4개 군으로 나누어 실험에 사용하였다. 각 군을 산부식만 시행한 경우(1군), air-abrasion만 시행한 경우(2군), 산부식 후 결합제를 적용한 경우(3군), air-abrasion 후 결합제를 적용한 경우(4군)로 나눠 각각의 치아를 표면처리한 후 치면열구전색제를 도포하였다. 고온(55℃)과 저온(5℃)에서 각각 30초씩 500회의 열순환을 시행한 뒤 미세누출도를 검사하여 다음과 같은 결과를 얻었다. 1. 치면열구전색제/치면열구전색제 경계면에서 미세누출도는 결합제 사용 유무에 관계없이 air-abrasion을 처리한 2군, 4군에서 산부식을 사용한 1군, 3군보다 낮은 값을 보였고(p<0.05) 1군과 2군, 3군과 4군 사이에는 통계적 유의차가 없었다(p>0.05). 2. 치면열구전색제/치아 경계면에서 미세누출도는 결합제를 사용한 3군, 4군에서 결합제를 사용하지 않은 1군, 2군보다 낮은 값을 보였고(p<0.05) 산부식을 사용한 1, 3군과 air-abrasion을 사용한 2, 4군 사이에는 통계적 유의차가 없었다(p>0.05). 3. SEM 상에서 치면열구전색제를 산부식 처리하였을 때 표면거칠기의 증가가 적었으나 air-abrasion 하였을 경우 표면거칠기가 현저하게 증가하는 것을 관찰하였다. The aim of this study was to investigate whether differences in surface treatment Prior to repair influenced the seal of a resin fissure sealant placed on the occlusal surfaces of permanent molar teeth. One hundred and twenty extracted human molars were selected and a light curing sealant was placed on their occlusal surface following cleaning by prophylaxis and acid etching. The teeth were deliberately damaged, and then stored in artificial saliva for four weeks. Sixty teeth with the desired morphology of sealant failure were randomly divided into four groups where one group was treated with only etching agent, another by only air-abrasion, another by applying an etching agent followed by a bonding agent, and the last by air-abrasion followed by a bonding agent each. After sealant application, the samples were thermocycled and the degree of microleakage was determined. The results were as follows: 1. In the sealant/sealant interface, group 2(0.22), 4(0.23) using air-abrasion showed a significantly lower microleakage score than group 1(0.38), 3(0.35) using an etching agent(p<0.05). There were no statistically significant differences(p>0.05) between groups 1, 2 and groups 3, 4. 2. In the sealant/tooth interface, group 3(0.20), 4(0.20) which used a bonding agent showed a significantly lower microleakage score than group 1(0.35), 2(0.40)(p<0.05). There were no statistically significant differences (p>0.05) between groups 1, 3 and groups 2, 4. 3. In SEM examination, while sealant surfaces treated with etching did not result in highly rough surfaces, those treated with air-abrasion did show rough surfaces.

일체부착형 합성고분자 시트를 이용한 지하구조물 방수 성능 향상에 관한 실험적 연구

강효진,오상근 서울産業大學校 2005 논문집 Vol.54 No.2

The waterproofing in slab and wall of underground structure have a couple of construction methods which are inside waterproofing methods for inner surface, and outside waterproofing methods for out wall and slab surface waterproofing. In resent years, however, it has been adapted the inside waterproofing construction method, as increasing of construction expenses cost and low workability and technology, nevertheless, outside waterproofing has set a most high value construction method. In inside waterproofing construction method, it is difficult to repair and assure durability and safety for concrete which has direct water-press. So, it is necessary for adopt the outside waterproofing method. For that reasons, this study based on the application for outside waterproofing method on the under ground structure, to introduce mono adhesive sheet waterproofing materials to more increase durability, as considering chemical and physical properties.

장애인 및 노약자를 위한 생활관련 시설의 연계방향

강병근,성기창,박광재,윤영삼,김상운,정현정,류상오 한국의료복지시설학회 2009 의료·복지 건축 Vol.15 No.1

This study aims to plan connecting living facilities considering on the Barrier Free Walking of the disabled and the elderly in the residential area. We had found several physical problems on the peestrian's way that becomes the major factor of disturbing the barrier free movement for using living facilities in the local area by investigations and enquetes. We had suggested the arrangement method for these physical problems on the pedestrian's way and building the ideal area for living facilities by the disposition stages with the result of investigations and enquetes. After these process, we had planned connecting living facilities considering on the Barrier Free WaIking of the disabled and the elderly in the residential area.

국내·외 관련 제도 및 실태분석을 통한 한국형 장애인 자립생활센터의 계획방향에 관한 연구

강지혜,윤영삼,김상운,성기창,박광재,강병근 한국의료복지시설학회 2006 의료·복지 건축 Vol.12 No.2

The wealth of Korean disability people’s paradigm has developed by the meaning of whole rehabilitation of the small society for acception and protection. Today, that meaning has been changed to make and choose disability people’s future plans by themselves. The CENTER FOR INDEPENDENT LIVING in Korea has been accepted through the American and Japanese’s activity systems with no objection. Following result of the real reserching, because the CENTER FOR INDEPENDENT LIVING in Korea have no legal basement, so there are little support for these centers and no proper rules and check systems. Therefore, we have to make the legal basement of CENTER FOR INDEPENDENT LIVING and separate by each parts of system and to specialize about them. That means, each parts of system have to mark role mode for doing well, and each systems have to develop new programs and services, and to specialize for in Korea. To add, we should have more small CENTER FOR INDEPENDENT LIVING in each area, and the CENTER FOR INDEPENDENT LIVING which are already started should make network system to contact with other centers in society for giving support of proper information.

관상동맥질환 환자에서 스텐트 시술 후 재협착에 관한 연구

강진환,권영주,박상호,한대희,이상철,김명구,변정득,최병조,심규혁,온영근,현민수,김성구 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.2

Background and aims : In the coronary artery disease, a rate of restenosis was much decreased by placement of coronary stent than when percutaneous transluminal coronary angioplasty has been applied, but there are still important clinical problems of restenosis. There has been many progressive studies about various factors contributed to this restenosis. So, we studied a relation between restenosis after placement of coronary stent in the coronary artery disease and many clinical factors, characteristics of stenotic lesion and procedural factors, and also assessed the restenosis rate of various coronary stents. Methods : Total 58 lesions(46 cases of patients ; man 30, woman 16) were evaluated, which has been performed a follow-up coronary angiography after 6 months (mean 188 days) since coronary stent had been placed. Various stents were implanted and assessed a relation between restenosis and many factors. Results : Of 58 lesions were target stenotic studies, there were 22 of restenotic lesions(37.9%), and the restenosis rate wes statistically significant difference in the relation with diabetes mellitus(p<0.05), group of acute myocardial infarction(p<0.05) among clinical diagnosis of ischemic heart disease(stable angina, unstable angina and acute myocardial infarction) in clinical factors and with high dilation pressure of stent(p<0.05) in procedural factors. When the rate of restenosis was evaluated among implanted stents, it was lowest in the Multilink^(®) stent and highest in the Nir Royal^(®) stent(60%). Conclusion : In this study of restenosis and various factors after placement of stents in the coronary artety disease, factors such as diabetes mellitus, group of acute myocardial infarction and a dilation pressure of stent were significant related with restenosis and the restenosis rate of Multilink^(®) stent was lowest and the highest restenosis rate was of Nir Royal^(®) stent.

중독한 추체로 증상을 보인 cyclosporine에 의한 뇌증 1예

강정현,곽승근,신현영,김성은,이정호,이정찬,곽상혁,윤환중,조덕연,김삼용,김제,송창준 충남대학교 의과대학 지역사회의학연구소 2000 충남의대잡지 Vol.27 No.1

The use of cyclosporine(CsA), a potent immunosuppressive agent, is associated with numerous side effects. Neurotoxicity was earlier less well known, but with growing experience central nervous system side effects are now reported up to 40% of patients. Among various CsA-induced neurotoxicities, tremor is most common and posterior leukoencephalopathy is well characterized. An encephalopathy presenting with pyramidal weakness, however, seems to be rare and poorly documented. We report here a case of encephalopathy presenting with multiple generalized seizures followed by fluctuating quadriparesis developed a few days after starting CsA and resolved spontaneously after withdrawal of the drug . A 48-year-old woman with aplastic anemia was placed upon immmunosuppressive treatment consisting of antithymocyte globulin(ATG), CsA, and methylprednisolone. Two days after starting the therapy, she developed a generalized seizure. The next day she developed 2 more episodes of seizure and the therapy was stopped. Computed tomogram of the brain was normal. Six days after starting therapy, she developed mild motor weakness and paresthesia of both lower extremities, which progressed to a definite quariparesis confining her to a bed in 3 days. Magnetic resonance imaging(MRI) of the brain revealed asymmetric, bilateral high-signal abnormalites in the subcortical white matter of fronto-temporal areas. After reaching to a maximum with some fluactuation(14 days after starting the therapy) the motor weakness started to be resolved. She was discharged with a almost complete resolution of the weakness 45 days after starting the therapy. Five months later she did well and brain MRI was negative.