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김영선,최경,이기식,Kim Young-Sun,Choi Kyung,Lee Ki-Sik 한국공학교육학회 2002 공학교육연구 Vol.5 No.2
최근 들어 인터넷과 웹의 보급이 확산됨에 따라 이를 이용한 교육용 콘텐츠들이 활발히 제작되고 있다. 본 연구에서는 전기전자 분야의 기본과목인 전기자기학을 교과의 대상으로 하여 콘텐츠를 제작하였다. 이 교과를 다루는 대부분의 교재들은 복잡한 수식으로 현상을 설명하고 있으므로 학생들이 현상을 이해하는 것이 쉽지 않다. 그리하여 학습 효과의 증대를 위하여 HTML, 그림, 애니메이션 및 음성 같은 멀티미디어 기법을 사용하여 콘텐츠를 제작하였다. 또한 다양한 전기자기적인 문제의 해석 및 연습에 사용할 수 있는 소프트웨어가 저자에 의해 개발되어 콘텐츠 내에 활용되었다. 본 콘텐츠의 전체적인 구성은 정전계, 정자계, 시변전자계 및 전파의 전파로 되어 있다. Recently, the use of the internet and the web becomes universal. So, many internet applications are made by educators. In this paper, contents about the electromagnetics course which is one of the basic subjects for electrical and electronic fields are dealt. Most textbooks concerned this topic describes the phenomena in mathematical formulas. Naturally, for the students, the understanding of the phenomena is not so easy. For the improvement the educational efficiency, the multimedia techniques such as HTML, pictures, animations and sound are utilized. And also the software developed by authors is available for the analysis or the exercise of various electromagnetic problems. The contents are composed 4 parts : electrostatic fields, magnetostatic fields, time varying fields propagation of waves.
김영선 ( Young Sun Kim ),김신영 ( Shin Young Kim ),이영민 ( Yeong Min Lee ),양기열 ( Ki Yeol Yang ),한지현 ( Ji Hyun Han ),정의 ( Eui Jung ) 대한주산의학회 2008 Perinatology Vol.19 No.4
Prenatal ultrasonographic appearance and Doppler characteristics of extracranial masses are variable, depending on the location, vasculature, amount of arteriovenous shunting, and degree of proliferation. Epidermoid cysts are found in a variety of locations around the skull and midface. They are thought to occur as a result of the persistence of ectodermal elements at sites of suture closure, neural tube closure, and diverticulation of the cerebral hemispheres. They contain ectoderm but no skin element. We experienced 33-year-old primigravida with fetal extracranial mass at 23 weeks gestation. We presumed that this extracranial mass was hemangioma. However, the mass was suspected as scalp epidermoid cyst on postnatal ultasonography.
콘크리트의 전염화물량 평가의 정밀도 향상에 관한 실험적 연구
김영선(Kim Young-Sun),김영덕(Kim Young-Duck),조봉석(Cho Bong-Suk),배기선(Bae Ki-Sun),김규용(Kim Kyu-Yong),김무한(Kim Moo-Han) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
Worldwide, Certification systems for standard of material and quality of product exist very variously. Korean industrial Standard (KS) is most representatively certification systems in Korea. But labolatory of korea uses often ASTM, RILEM and JIS and these standards do not get into unionization. so, Granted that experiment is same, result still can different. Therefore, this research measured chloride amount of hardened concrete using identical material and wished to improve accuracy of chloride estimation as that comparison evaluate to each examination.
보급형 균열저감 콘크리트의 건조수축 변형에 관한 실험적 연구
김영선 ( Young Sun Kim ),김광기 ( Kwang Ki Kim ),이주호 ( Joo Ho Lee ),김보승 ( Bo Seung Kim ),김정선 ( Jung Sun Kim ) 한국건축시공학회 2016 한국건축시공학회 학술발표대회 논문집 Vol.16 No.1
In this study, the shrinkage properties of concrete with the high-performance shrinkage admixture and the crack reinforcing materials applied to the high-flatness flooring of hypermarkets, outlets and warehouses was evaluated. The concrete with the popular shrinkage admixture is significantly reduced compared to the plain concrete without shrinkage admixture for the dry shrinkage deformation, and the difference of shrinkage ratio between the concretes has been shown to increase with increasing age.
콘크리트의 전염화물량 평가의 정밀도 향상에 관한 실험적 연구
김영선 ( Kim Young-sun ),김영덕 ( Kim Young-duck ),조봉석 ( Cho Bong-suk ),배기선 ( Bae Ki-sun ),김규용 ( Kim Kyu-yong ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Worldwide, Certification systems for standard of material and quality of product exist very variously. Korean industrial Standard (KS) is most representatively certification systems in Korea. But labolatory of korea uses often ASTM, RILEM and JIS and these standards do not get into unionization, so, Granted that experiment is same, result still can different. Therefore, this research measured chloride amount of hardened concrete using identical material and wished to improve accuracy of chloride estimation as that comparison evaluate to each examination.
김영선 ( Kim Young-sun ),김광기 ( Kim Kwang-ki ),박순전 ( Park Soon-jeon ),김정선 ( Kim Jung-sun ) 한국건축시공학회 2017 한국건축시공학회지 Vol.17 No.3
Recently, structures such as large retailers, outlets and warehouses have been increasing in accordance with changes in consumption patterns. Since these structures include ultra-flat slab members, they are thoroughly managed to control slab cracking by the plastic and drying shrinkage. In order to control the cracking of the slab member, a chemical crack reduction method is used. In particular, the use of the shrinkage reducing agent has been examined. However, domestic research results are limited. In this study, the shrinkage properties of concrete using shrinkage reducing agent and the drying shrinkage properties according to the mixing factors were investigated. The performance of domestic shrinkage reducing agent was appeared similar to that of overseas high-grade shrinkage reducing agent. As the shrinkage reducing agent usage increased, the drying shrinkage reduction effect increased. At the age of 100 days, the dry shrinkage rate of specimen with the shrinkage reducing agent of 1.5%was shown about half that of the specimen without the shrinkage reducing agent. The shrinkage reducing agent was gound to have no specific performance change for the use of the admixture.
숏크리트 리바운드율에 미치는 시멘트 분말도 영향에 관한 실험적 연구
김영선 ( Young Sun Kim ),김광기 ( Kwang Ki Kim ),김재영 ( Jae Young Kim ),최현국 ( Hyun Kook Choi ),이주호 ( Joo Ho Lee ) 한국건축시공학회 2015 한국건축시공학회 학술발표대회 논문집 Vol.15 No.1
This study was carried out to investigate and analyse the influence of brain and unit weight of cement on the properties of shotcrete through the laboratory and field test. From the results of the test, the shotcrete with high blaine cement showed the rebound ratio lower and the strength properties higher than the shotcrete with normal blaine cement. Such as this was produced also in the mix with low unit weight of high blaine cement.