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가스누출 감지용 실리콘 압저항형 절대압센서의 제조 및 온도보상
손승현,김우정,최시영 ( Seung Hyun Son,Woo Jeong Kim,Sie Young Choi ) 한국센서학회 1998 센서학회지 Vol.7 No.3
Silicon piezoresistive absolute pressure sensor for gas leakage alarm system was developed. This sensor must operate normally in the range of 0∼600 mmH₂O pressure, and 100 temperature. To make the most of this sensor for gas leakage alarm system, gas must not leak from the sensor itself when the diaphragm of the sensor fractures. Thus, the sealed diaphragm cavity was anodically bonded to Pyrex 7740 glass under the condition of 10^(-4) torr at 400 ℃. The sensitivity of developed sensor was 4.06 ㎶/VmmH₂O for 600 mmH₂O full-scale pressure range. And temperature compensation method of this sensor is to change bridge-input-voltage linearly in proportion to the temperature variation by using diode(YXIN4001) or Al thin film resistor. By these methods the temperature effect in the range of 0∼100℃ was compensated over 80% for offset drift, 95% for sensitivity.
손승현 ( Son Seung-hyun ),김기호 ( Kim Ki-ho ),김선국 ( Kim Sun-kuk ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Glass fiber reinforced concrete (GFRC) is very suitable as a material for free-form concrete panels (FCPs) because of its lightweight, strong, moldable, durable and sustainable properties. GFRC is superior in construction and maintenance compared with materials such as steel, aluminium, titanium, glass and plastic, and is advantageous in cost. However, GFRC is being produced by skilled craftsmen, and still lacks the technology to economically produce high quality FCPs. Currently, there is a technology to automatically and accurately produce FCPs. However, the developed technology can not be applied to the field with simple production technology without production line for mass production. To solve this problem, the purpose of this study is a basic study of production system development of free-form concrete panels. This study introduces the developed FCPs production technology and builds FCP production system for mass production. The results of this study will be used as basic data for the commercial production of FCPs in the future.
봉사학습을 통한 예비교사의 교육현장 참여경험에 관한 질적분석
손승현(Son, Seunghyun),나경은(Na, Kyong-Eun),문주영(Moon, Juyeong),서유진(Seo, You-Jin) 한국교육방법학회 2011 교육방법연구 Vol.23 No.3
예비교사 교육에서 교육현장 경험이 강조되면서 교육봉사가 필수이수과목으로 지정된 가운데, 본 연구는 봉사학습을 통한 예비교사들의 교육현장 참여경험을 질적으로 분석하였다. 서울시 소재 K대학교에 재학 중인 125명의 사범대 또는 교직이수 학생들이 교직수업과 연계하여 진행된 봉사학습에 참여하였다. 예비교사들의 봉사학습 보고서에 나타난 봉사학습 경험을 지속적 비교법에 기초하여 질적으로 분석하였다. 분석결과 125개의 개념, 34개의 하위범주, 16개의 범주가 도출되었고, 도출된 개념과 범주를 그 내용을 기초로 하여 봉사학습 활동 참여의 시작, 봉사학습 활동 참여의 중심경험, 봉사학습 활동 참여의 맥락조건, 봉사학습 활동의 외부적 영향 조건, 봉사학습 활동 전략, 봉사학습활동 참여 경험의 결과로 분류한 후 제시하였다. 예비교사의 실천적 역량강화를 위한 교과목과 연계한 봉사학습의 적극적 운영 제안과 본 연구의 제한점과 함께 추후연구 방향을 논의하였다. It has been emphasized to integrate field-based experiences into the pre-service education curriculum. This study analyzed the service learning experiences of pre-service teachers qualitatively. The participants were the 125 pre-service teachers who took the classes of the researchers, in which service learning was required to perform. The researchers analyzed the reports completed by the 125 pre-service teachers by asking their service learning experiences and processes. Data were analyzed by using the constant comparative method. As the results, the pre-service teachers' experiences were analyzed into 125 concepts, 34 subcategories, and 16 categories. The implication for the educational service were discussed and suggested.
손승현(S.H.Son),김상용(S.Y.Kim),김창섭(C.S.Kim),지철근(C.K.Chee) 한국조명·전기설비학회 1990 한국조명·전기설비학회 학술대회논문집 Vol.1990 No.-
Temperature distribution of high pressure mercury lamp has been measured as a function of time using spectroscopic method. Sampling signal which is synchronized by lamp voltage was used to measure temporal line intensity at each radius. To obtain radial temperature distribution, the measured intensity was transformed into radial line intensity by Abel"s formula. Absolute temperature profile was calculater from relative intensities of spectral lines as a function of line and tube radius. The temperature profile is very similar to the electrical tube current profile.
손승현 ( Son Seung-hyun ),김기호 ( Kim Ki-ho ),이준아 ( Lee Jun-ah ),김선국 ( Kim Sun-kuk ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
Logistics facilities are characterized by wide spans and high flooring, most of which are constructed with PC (Precast Concrete) methods to meet a wide range of commercial and industrial needs. However, the PC structure is a pin joint design, and the construction cost is increased due to the restrictions caused by the installation process, and the construction period is lengthened. In order to solve the above problem, SMART Frame, which is a structural system similar to the steel frame structure, was developed by embedding a steel frame at both ends of the PC. The purpose of this study is to analyze the erection time reduction effect of steel connected precast concrete components (SMART frames) for long span and heavy loaded logistics buildings compared to existing PC frames. For this study, a logistics building constructed with pin joint PC components is selected as a case. The result is compared with the existing PC frame to confirm the erection time reduction effect.
초등수학 사실적, 개념적, 절차적 지식 교수를 위한 증거기반 중재의 실제
손승현 ( Seung Hyun Son ),서유진 ( You Jin Seo ),이주영 ( Joo Young Lee ),문주영 ( Ju Yeong Moon ) 한국초등교육학회 2011 초등교육연구 Vol.24 No.3
본 연구는 초등학교 학생들을 대상으로 한 국내 수학중재 연구 총 64편을 분석하여, 수학의 내용영역에 따라 수학의 사실적, 개념적, 절차적 지식을 향상시키는데 효과적인 증거기반 중재가 무엇인지를 밝히고, 각 중재의 세부적인 특징과 절차, 중재적용 수학영역은 무엇인가를 분석하였다. 분석결과, 첫째, 사실적 지식의 향상을 위한 효과적인 중재는 수와 연산영역에서 또래교수, 놀이활동, 직접교수법 등으로 나타났다. 둘째, 개념적 지식의 향상을 위한 효과적인 중재는 수학의 전 영역에서 현실맥락 교수, 구체물·표상기반 교수, 수학적 의사소통을 위한 교수로 나타났다. 마지막으로 절차적 지식 향상을 위한 효과적인 중재는 수학의 전 영역에서 인지·메타인지 전략, 수학문제 만들기, 도식기반 표상전략 교수인 것으로 나타났다. 각 지식의 영역별 효과적 중재의 특징과 절차, 중재제공시 유의점 등이 기술되었다. 또한 분석결과에 따른 학생들의 수학의 지식영역별, 내용영역별 균형 있는 수학능력 향상을 위한 향후 연구방향과 제안점이 논의되었다. This study reviewed research in elementary mathematics intervention and identified the evidence-based practices to build factual, conceptual, and procedural mathematical knowledge. Also, this study analyzed the instructional procedures and target mathematics content area of the intervention. The results of this study suggested that there were peer tutoring, activity-based mathematics, and direct instruction as effective interventions to build factual mathematical knowledge in the area of number and operation. Second, there were realistic context mathematics, concrete-representation-abstract, and mathematical communication to build conceptual knowledge across the all mathematics area. Finally, there were cognitive/metacognitive strategy instruction, problem posing activity, and schema-based representation strategy to build procedural knowledge across the all mathematics area. Instructional guidelines and procedures of the intervention across three knowledge areas and mathematics area were presented based on the analysis of the 64 articles. The importance of balancing these three knowledge areas across mathematics content areas to improve the instructional practices are discussed.