프롭테크 도입을 통한 부동산 전자계약시스템 개선에 관한 연구 - 블록체인 기술을 중심으로 -

이성민,김희준,이명훈,김재준,Lee, Sung-Min,Kim, Hee-Joon,Lee, Myeong-Hun,Kim, Jae-Jun 한국BIM학회 2021 KIBIM Magazine Vol.11 No.3

Existing real estate markets are monopolized because they are capital intensive and have information asymmetry. However, with the advent of the Fourth Industrial Revolution, technology is converging in various industries based on information technology (IT), and the real estate market is also developing a new field called "PropTech". According to this trend, new PropTech technologies are emerging in various real estate services sectors in Korea, but the electronic contract system, which accounts for the largest portion of the real estate industry, is still cited as a complex identification process and long processing time. Therefore, in this paper, we propose an improvement plan for the current electronic contract system through the introduction of blockchain technology, which is drawing attention with the development of PropTech, and explore the possibility of introduction by producing an experimental model of blockchain-applied electronic contract system in a programming language.

숭례문 사례를 통한 육축 문화재의 구조특성 연구

이성민,이기학,최희수,박주경,최취경,Lee, Sung-Min,Lee, Ki-Hak,Choi, Hee-Soo,Park, Joo-Kyung,Choi, Chui-Kyoung 한국공간구조학회 2011 한국공간구조학회지 Vol.11 No.4

우리나라의 석조문화재을 모델링할 때 불연속면을 갖는 구조재의 강성을 어떻게 규명하느냐가 매우 중요하지만 원형보존을 해야 하는 문화재의 특성상 이를 파악하기란 매우 곤란하다. 이를 위해 본 연구에서는 비파괴조사를 이용하여 고유진동수를 측정한 후, 시행착오법을 이용하여 측정된 고유진동수와 컴퓨터 모델링 해석을 통해 고유진동수를 비교함으로써 불연속면의 강성, 구조재의 탄성계수 등 숭례문 육축 구조를 이루는 재료의 구조적 물성을 추정하였다. 이를 통해 육축 문화재에 대한 컴퓨터 모델링 기법을 제시하고 육축구조물의 안전성에 영향을 미치는 요인을 분석하였다. 연구결과 적심석의 강성이 육축구조물의 안전성에 가장 큰 영향을 미지는 젓으로 분석되었다. It is hard to predict the mechanical characteristics of discontinuous stone masonry structures with the use of by the static analysis method, because of irregularity of face stones and also due to randomness of backfill materials. Inversely, one can estimate the mechanical characteristics by comparing the natural frequencies between measured from the field tests and computed from the analytical models. The aim of this paper is to investigate the effectiveness and confidence of the computational modeling method of ancient stone arch bridges in Korea and to find the factors influencing their dynamic characteristics. The results revealed that the rigidity of spandrel walls and backfill materials are the most important factors influencing the natural frequencies of stone arch bridges, which are the critical for the stability of the stone arch structure.

1달 간격으로 재발생한 동양안충의 인체감염 1예

이성민,신규민,김동희,강병남,Sung Min Lee,Kyu Min Shin,Dong Hee Kim,Byung Nam Kang 대한안과학회 2010 대한안과학회지 Vol.51 No.6

Purpose: To report a relapsed case of an intra-conjunctival Thelazia callipaeda infestation within one month. Case summary: A 59-year-old female patient presented with symptoms of itching and a sense of foreign substance in her left eye, which she had been experiencing for several days. Conjunctival hyperemia and follicle multiplication along with ten actively moving worms were identified and were extracted with forceps. The symptoms disappeared until 25 days later, when they recurred and five additional worms were extracted. All of the extracted worms were confirmed to be Thelazia callipaeda and the patient’s symptoms disappeared after the final extraction. Conclusions: More than one month of follow-up observation is required for human infection by Thelazia callipaeda due to the post- extraction growth of the larva. J Korean Ophthalmol Soc 2010;51(6):895-898

고양이 3종(FPV, FHV, FCV) 불활화 백신의 효과

이성민,윤인중,최환원,이근좌,이경열,김무강,Lee, Sung-min,Yoon, In-joong,Choi, Hwan-won,Lee, Keun-jwa,Lee, Kyoung-youl,Kim, Moo-kang 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.3

This study tested the effect of a trivalent (feline panleukopenia; FPV, feline viral rhinotracheitis; FHV, feline calicivirus infection; FCV) inactivated vaccine in cats. The vaccine was tested for the safety in guinea pigs, mice and cats. Also, it was tested for the efficacy in cats. The vaccine was inoculated to cats at 7~9 and 10~12 weeks of age (conventional schedule) and the serological response to vaccination was assessed and was compared to the unvaccinated group. All cats were bled by jugular venipuncture for FPV, FHV and FCV specific serological test (virus neutralizing antibody, VN) at 7~9, 10~12 and 13~15 weeks. After last bleeding, all cats were inoculated with each virus (FPV : orally $2ml\;10^{7.5}\;TCID_{50}/ml$, FHV : nasally $1ml\;10^{7.0}\;TCID_{50}/ml$ and FCV : nasally $1ml\;10^{7.0}\;TCID_{50}/ml$). The Vaccine verified excellent protective effect in guinea pigs, mice and cats. The VN antibody titers of the unvaccinated group cats against FPV, FHV and FCV were <2~16, on the other hand the vaccinated group cats were $512{\sim}{\geq}4096$, 64~1024 and 64~1024, respectively. When all cats were challenged with virulent viruses, the survival rates of the vaccinated group cats were over 80%, while the survival rates of the unvaccinated group cats were less 20%. The typical clinical signs were not observed in the vaccinated group cats, but the typical clinical signs and histopathological lesions were observed in the unvaccinated group cats. As the result of tests, the VN values obtained in this study appeared to be high enough to protect cats from viral challenges. The trivalent (FPV, FHV, and FCV) inactivated vaccine seemed to be very effective, for prevention of feline viral diseases (FPV, FHV, and FCV).

논문편 : 20대와 40대 여성의 상반신 체형과 유방형태 분석 및 분류

이성민,손희순 ( Sung Min Lee,Hee Soon Sohn ) 대한가정학회 1996 Human Ecology Research(HER) Vol.34 No.6

복숭아씨살이좀벌(Eurytoma maslovskii)의 기주, 발생양상 및 산란특성

이성민,김세진,양창열,신종섭,홍기정,Lee, Sung-Min,Kim, Se-Jin,Yang, Chang Yeol,Shin, Jong-Seop,Hong, Ki-Jeong 한국응용곤충학회 2014 한국응용곤충학회지 Vol.53 No.4

매실의 낙과 피해를 일으키는 복숭아씨살이좀벌은 경기도, 충청남북도, 전라남북도 지역의 매실과 살구, 그리고 중국산 복숭아 종자에서 확인되었다. 복숭아씨살이좀벌은 땅에 떨어진 핵과류의 핵 속에서 유충 상태로 월동하고, 노숙유충은 4월 중순까지, 번데기는 3월 하순에서 4월 하순까지 관찰되었으며, 성충은 4월 하순~5월 상순 사이에 90% 이상이 우화하는 것으로 조사되었다. 암컷 성충은 핵이 경화되기 이전 씨앗이 액상일 때 과실 씨앗의 외피 바로 밑에 산란하였으며, 산란관의 길이가 5 mm를 넘지 않아 산란이 가능한 매실의 크기는 직경이 2 cm를 넘지 않았다. 하나의 과실에 최대 5개의 알이 관찰되었으며, 알 기간은 2일을 넘지 않았다. 부화한 유충은 먼저 고형화되는 배로 이동하여 이를 섭식하면서 성장하는데 이 과정에서 유충들 사이의 경쟁으로 인해 한 마리의 유충만 생존하였다. 6월 상순경 피해를 받은 과실의 대부분이 부패증상을 보이며 낙과하였다. 땅에 떨어진 과실의 핵 속에서 이듬해 봄까지 노숙유충으로 월동하였다. We investigated the host fruit, seasonal occurrence, and oviposition habits of the eurytomid wasp, Eurytoma maslovskii that cause Japanese apricot fruit drops. This eurytomid wasp was found to occur in Gyeonggi-do, Chungcheongbuk-do, Chungcheongnam-do, Jeollanam-do, and Jeollabuk-do in Korea, and it attacked seeds of Japanese apricot, apricot, and peach. Overwintered larvae were observed until mid April, inside the stone of Japanese apricots. Pupation took place between late March and late April. More than 90% of the adult wasps emerged between late April and early May. The female wasps laid eggs just under the seed coat before endocarp hardening. The length of the wasp ovipositor was at least 5 mm, and hence, the diameters of fruits for oviposition would not exceed 2 cm. We observed up to five eggs per fruit, and the egg stage did not last for more than two days. Newly hatched larvae moved to the embryo, which is the first part that forms in a seed, and feeds on this. Larval competition occurs during this time; in this study, only one larva survived and matured. Thus, from the larva cycle of the wasp, most of the damaged fruits would have fallen by early June, before the harvest period.

장거리 가스수송 배관의 배관건전성 확보 대책

이성민,Lee, Sung-Min 한국유체기계학회 2003 한국유체기계학회 논문집 Vol.6 No.2

인도네시아 프람바난 사원의 지진 피해 현황

이성민,이기학,최정삼,Lee, Sung-Min,Lee, Ki-Hak,Choi, Jeong-Sam 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.2

드로잉 공정에서 소재 유입에 영향을 미치는 인자에 관한 연구

이성민,신진희,김경아,이춘규,Lee, Sung-Min,Shin, Jin-Hee,Kim, Kyung-A,Lee, Chun-Kyn 한국금형공학회 2022 한국금형공학회지 Vol.16 No.2

Sheet Metal Forming by Press Forming Process takes a lot of time and cost from mold design to manufacturing. Therefore, all of die-makers are continuously conducting research to reduce the number of mold processes or the size of blanks to reduce costs. In the case of Forming complex shapes such as automobile component, wrinkles and cracks occur, so draw beads are used. Draw beads play an important role in suppressing the inflow of materials and minimizing the size of blanks. Factors that affect material flow include draw bead, blank holding pressure, lubricant, and surface roughness of punch and die. Most of the factors affect friction. In this study, after classifying circular beads and rectangular beads in cylindrical drawing molds using the AutoForm analysis program, the factors affecting the material inflow were considered.

스페이스프레임에 사용되는 에너지 흡수형 볼트의 인장성능연구

이성민,김민숙,최정삼,강창훈,Lee, Sung-Min,Kim, Min-Sook,Choi, Jung-Sam,Kang, Chang-Hoon 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.6

스페이스프레임의 볼 조인트 접합부에서는 축부에 핀의 삽입을 위한 구멍이 존재하기 때문에 응력집중으로 인한 취성파단의 우려가 있다. 따라서 접합부에서의 변형능력이나 에너지흡수능력은 낮은 편이다. 본 연구에서는 볼 조인트 접합부의 소성변형능력을 향상시키기고 현장에서 발생할 수 있는 시공오차의 흡수가 가능하도록, 볼트의 나사부나 핀부의 취성파단 없이 감소된 축부에서 소성변형능력이 기대되는 새로운 접합상세를 개발하였으며 수치해석과 실험을 통해 그 성능을 검증하고자 하였다. 수치해석과 실험을 통하여 볼트의 축부 및 핀부의 단면을 조절함으로써 기존 고력볼트보다 소성변형능력이 향상됨을 확인할 수 있었다. The hole for the insertion of the pin in the shank is exist at ball joint connection of the space frame. It brings about the brittle fracture caused by stress concentration. Consequently it cannot expect the deformation performance or energy absorption performance from ball joint connection. In this study we developed a new connection details which will increase the plastic deformation performance at ball joint connection and can absorb the error in construction, which expect the plastic deformation performance at the reduced shank without brittle fracture at the screw of bolt and pin. Also it's capacity is verified by the performance in numerical analysis and test. We confirmed bolt's plastic deformantion performance through controled shank and pin's area.