한국의 공업화건축 공법 도입활용과정 분석을 통한 3D 프린팅기술 개발 방향성 연구

이성민,이필원,조후영,이재헌,Lee, Sung-Min,Lee, Pil-Won,Cho, Hoo-Young,Lee, Jae-Heon 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4

This paper aims at finding some lessons applicable to successful implementation of 'The 3D Printing R/D Project' through both examining the process of adopting overseas industrialized housing production technological knowhow by home builders during the 1970's~1980's period and thereafter until now the various efforts to adjust the technologies efficiently to the Korea's unique situation. Some meaningful lessons can be summarized as follows; I) Deep understanding of 3DP technological know-why along with its inheritance, II) Readjusting of R/D period and goals(cf. Global leader Winsun's 15 years experiment), III) Restructuring for more collaborative R/D B&E system among participating researchers IV) Fostering 3DP expert-engineers and technicians from the early stage, V) Clearing legal barriers in users' adopting 3DP methods necessary, VI) Development of appropriate building material besides concrete. Therefore, it is highly recommended that the above-mentioned 6 lessons positively accepted and applied to the Research Implementation Plan in due course, especially by KICT consortium and KAIA under the guidance of Ministry of Land, Infrastructure and Transport.

고유진동수를 이용한 정림사지 5층 석탑의 구조모델

이성민,이기학,박선우,서만철,이찬희,Lee, Sung-Min,Lee, Ki-Hak,Park, Sun-Woo,Suh, Man-Chul,Lee, Chan-Hee 한국공간구조학회 2008 한국공간구조학회지 Vol.8 No.5

요즘은 비선형해석과 유한요소해석이 가능하며 또 불연속면을 모델링을 통해 구현할 수 있도록 개발된 컴퓨터 프로그램이 개발되어 사용되고 있다. 그러나 석조구조물의 물성을 파악하지 않고서는 이러한 프로그램을 이용하여 실제거동을 예측하기가 매우 곤란하다. 이를 위해 석재와 석재의 접촉부의 강성의 변수를 사이부재를 가정하는 방식으로 수행하였으며, 실제 고유진동수를 측정하고, 석탑을 다자유도계 구조물로 가정하여 고유치 해석을 한 다음 이론상 고유진동수와 실제고유진동수가 일치하도록 접촉면의 강성을 조절하는 방식으로 모델링을 수행하였다. 연구를 위해 정림사지 오층석탑을 대상으로 구조모델링을 실시하였다. 본 연구결과는 석탑형 문화재에 대해 범용 프로그램을 이용한 구조모델링을 가능하도록 함으로써 주요 석탑형 문화재의 연직하중 뿐 아니라 진동이나 횡력에 대한 구조안전성 평가를 하는 과정에서도 유용할 것으로 기대된다. Multi-layered stone masonry monuments, such as stone pagoda can be modeled as a multi-degrees of freedom system. The dynamic behavior of these structures are mainly influenced by contour condition of contacting surface of stones. In this case the mass of the system can be easily estimated, mean while the estimation of stiffness at junction is not simple. In this paper a method for estimating the spring constant at the contacting surface of stone in proposed. This paper describes a method of computational modelling technique for structural analysis of stone pagodas using measurement of natural frequency and eigenvalue analysis. For this purpose Five story stone pagoda in Cchongnimsa site was selected as a model.

지각과민 치아에 대한 처치약재의 임상적 연구

이성민,이찬영,이승종,박동수,Lee, Seong-Min,Lee, Chan-Young,Lee, Seung-Jong,Park, Dong-Soo 대한치과보존학회 1989 Restorative Dentistry & Endodontics Vol.14 No.1

The purpose of this study was to evaluate the periodic effect of desensitizing drug such as potassium oxalate(D.D.S. # I&II), strontium chloride (ZAROSEN)$^{(R)}$, and placebo group. The 193 teeth of 93 patients who had been complained dental hypersensitivity, and were divided into three groups by application agent and desensitizing treatment was completed. The interval of observation and treatment period were immediately, 1 week, 2 week, 3 week, 4 week, before and after treatment. The data was statistically analized and the results were as followed. 1. Group I showed best desensitizing effect to the stimuli, followed by Group II, Group III. 2. There was a significant difference (p < 0.005) in desensitizing effect among the Group I, Group III and Group II, Group III but there was no significant difference (p < 0.005) in Group I, Group II. 3. The cold stimuli was most effective in desensitization and there was a significant difference (p < 0.005) in cold, air-blast, but there was no significant difference (p < 0.005) in other stimuli. 4. There was no significant difference (p < 0.005) in effect of the desensitization of the cause of exposed dentine. 5. Anterior teeth was more effective than posterior teeth in desensitization and there was a significant difference (p < 0.005) between anterior teeth and posterior teeth. 6. In analysis of stimuli on the potassium oxalate, there was a significant difference (p < 0.005) in cold, air-blast but there was no significant difference (p < 0.005) in other stimuli.

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).

汾西 朴瀰의 書畵애호와 그 기록 : 「丙子亂後集舊藏屛障記」를 중심으로

이성민(Lee, seong-min) 동양한문학회 2011 동양한문학연구 Vol.32 No.-

汾西 朴?는 병자호란이 끝난 뒤 강화도에서 돌아와, 소장하고 있던 8점의 서화 작품들을 다시 裝幀하여 병풍으로 만들었다. 그리고 ?丙子亂後集舊藏屛障記?라는 제목 하에 총 8편의 記를 지었다. 이 글에는 서화 品評에 뛰어났던 박미의 모습을 비롯하여 當代 서화계의 다양한 품평 활동이 기록되어 있다. 아울러 서화와 관련된 다수의 逸話가 채록되어 있다. 따라서 17세기 전반기 서화계의 실상을 보여주는 중요한 자료이다. ?丙子亂後集舊藏屛障記?의 내용은 4가지 정도로 요약할 수 있다. 첫째는 宣祖의 御筆 서화에 대한 品評으로, 宣祖의 서화 취향과 성취를 기록하였다는 점에 의의가 있다. 둘째, 當代의 전문적 서화 품평 활동에 관한 내용을 기록하였다. 특히 뛰어난 서화 품평가로서 白沙 李恒福의 위상이 잘 나타나있다. 셋째, 서화 관련 일화의 채록이다. 초상화에 뛰어났던 李信欽 관련 일화는 여타 기록에 보이지 않는 흥미로운 기록이다. 이 일화들은 17세기 전반기 조선 서화계의 이면을 보여준다는 점에서 중요하게 다루어야 한다. 넷째 松雪體에서 王羲之體로의 書體 변화에 대한 박미의 비판적 입장을 확인할 수 있는데, 이 점에 대해서는 보다 구체적인 고찰이 필요하다. ?丙子亂後集舊藏屛障記?는, 題跋 등을 통해 산발적으로 이루어지던 이전 시기 서화 관련 논의의 형태를 벗어나, 같은 제목 하에 서화만을 집중적으로 논의한 ‘최초의 기록’이라는 점에서 그 가치를 평가할 수 있다. Bunseo Park-Mi returning from Kanghwa(江華) Island after Byeongja-horan was over made folding screen again by arranging 8 pieces of work of calligraphy and paintings. And he wrote total 8 writing with title of Byeongjananhu-jipgujangbyungjangi(丙子亂後集舊藏屛障記), meaning of recording document that was written after manufacturing folding screen with collecting old paintings owned by him after Byeongja-horan was over. Various evaluation activities of calligraphy and paintings world at that time were recorded in this writing. Together, many anecdotes related to calligraphy and paintings were collected. Therefore, it is important data that show actual circumstances of calligraphy and paintings world at first half years of 17th century. The contents of this writing can be summarized by four. First, that make evaluation about King Seonjo(宣祖)'s work, there is a meaning that recorded King Seonjo's inclination and accomplishment of calligraphy and paintings. Second, it recorded contents about professional calligraphy and paintings evaluation activity at that time. Especially, he raised the image of Baeksa Lee-hangbok(李恒福) as excellent calligraphy and paintings evaluator. Third, it is collection of anecdotes of calligraphy and paintings. These anecdotes are important at point that show part which it is not known well of Joseon dynasty calligraphy and paintings world at first half years of 17th century. Fourth, we can confirm Park-Mi's critical standpoint about change from Songseolche(松雪體) to Wangheejiche(王羲之體), need more specific investigation about this point. Byeongjananhu-jipgujangbyungjanggi, escaping discussion form related to calligraphy and paintings attained sporadically through Jebal(題跋) at previous time, can be evaluated by the value of “The first recording” that discuss only calligraphy and paintings intensively under same title.

석회석광산 지하대형공간의 재난관리를 위한 업무영향력 분석

이성민,김선명,이연희,Lee, Seong-Min,Kim, Sun-Myung,Lee, Yeon-Hee 한국터널지하공간학회 2013 한국터널지하공간학회논문집 Vol.15 No.6

현재 국내 석회석광산은 개발 방식 및 특성에 따라 환경적, 사회적, 경영적 측면에서 다양한 문제 등을 내포한 채 운영되고 있다. 따라서 최근에는 이 같은 문제점들을 저감하고 지속가능한 광산개발을 위하여, 갱내채광 혹은 시설물 갱내화 등 다양한 노력이 계속되고 있다. 이러한 노력은 기존의 광산개발 공간 외에 새로운 지하대형공간의 생성을 유발하기 때문에, 작업자 및 시설물의 안전성확보를 위하여 발생 가능한 다양한 종류의 리스크에 대한 재난관리 필요성이 제기되고 있다. 본 연구에서는 지하대형공간을 구축하고 시설물을 갱내화하여 본격가동을 앞둔 석회석광업현장의 작업자들을 대상으로 설문조사를 실시하여 리스크 위험도평가 및 업무영향력분석 후 재난관리를 위한 업무우선순위를 도출하였다. 그 결과, 대상 현장의 경우 파분쇄 및 분립선별공정에서 안전수칙 불이행으로 인한 리스크에 대하여 위험도가 가장 높은 것으로 나타났다. 또한, 이 리스크에 대한 재난발생시 업무연속성 유지를 위한 영향력을 분석결과 우선적으로 갱내외의 연계작업이 원활하게 이루어지도록 해야 하는 것으로 나타났다. As Limestone mines have been operated with various environmental, societal and managemental problems depending on their characteristics and developing methods, many great efforts have been applied to solve these problems. Installing the mining facilities underground is one of the successful efforts to keep the sustainable limestone mine development. This effort could reduce these problems. However, unfortunately it made an side effect of constructing a large underground space in mining site. Moreover, this space caused a necessity of various disaster managements for the safety of workers and facilities. This study introduces the priority list of a limestone mining process if there are disasters in underground mining site. This result is coming from the risk assessment and business impact analysis on survey data which were obtained from the miners of that particular limestone mine. According to the result, the highest risk is 'disregard of safety guidelines in crushing & classifier process'. The result also shows the highest priority business, above all things, is 'a pit linked work of in & out process'.

고효율 플라즈마 디스플레이를 위한 표면 플라즈몬 기술 - 투명 플라즈마 디스플레이를 중심으로 -

이성민,최경철,Lee, Seong-Min,Choe, Gyeong-Cheol 한국정보디스플레이학회 2012 인포메이션 디스플레이 Vol.13 No.3

네트워크 및 전송기술의 발달로, 고품질 HDTV, IPTV 및 3DTV 영상서비스가 가능하게 되었다. 통신망을 사용한 멀티미디어 서비스 및 DMB와 같은 이동 수신 방송 등은 사용자에게 편의성을 제공한다. 그러나 한정된 대역폭으로 인한 압축 열화와 전송오류로 인한 화질 열화의 발생으로 멀티미디어 서비스의 체감 품질(QoE: Quality of Experience)이 중요한 문제로 부각되고 있다. 이러한 문제를 해결하기 위하여 국제전기통신연합(ITU)과 VQEG 등의 국제 표준화 기관에서는 다양한 환경과 규격의 영상에 대해 영상의 품질을 측정하는 표준화를 진행하였다. 본 고에서는 동영상 화질 평가에 대해 기존에 진행된 표준에 대하여 소개하고, 현재 ITU에서 진행중인 표준화 동향 및 이슈들을 살펴본다.

Estimation of the thickness of refractory ceramics using the impact-echo method

이성민,신남호,노용래,Lee, Seongmin,Shin, Namho,Roh, Yongrae The Acoustical Society of Korea 2017 韓國音響學會誌 Vol.36 No.4

일반적으로 내화물의 진동특성은 등방성 재료로 가정한 후 확인한다. 하지만 실제로 내화물은 특정 방향으로 가압 성형하여 제조되기 때문에 이방성 재료특성을 보인다. 따라서 본 연구에서는 내화물을 정방정계 대칭성으로 가정하고, 유한요소프로그램을 이용해 너비, 길이, 높이 방향에 대한 주파수 응답을 얻었다. 해석결과의 타당성은 실제 측정결과의 비교를 통해 검증하였다. 주파수 응답을 기반으로, 충격방향기법을 이용하여 내화벽돌의 세 방향의 두께를 추정하였다. 실험을 통해 찾은 두께와 실제 두께와의 최대 오차율은 5 % 미만으로 확인되었다. 이를 통해 내화물과 같은 이방성 재료 두께 측정 시 충격반향기법의 효용성을 확인하였다. Generally, the vibration characteristics of refractory ceramics are identified by assuming them as isotropic materials. However, in practice, refractory ceramics exhibit anisotropic properties as they are manufactured by pressing ceramic powders along a particular direction. Therefore, in this research, the frequency responses of a refractory ceramic brick along its width, length, and height directions were acquired using finite element analysis by assuming that the ceramics had tetragonal symmetry in their material properties. The validity of the numerical analysis results was verified by comparing them with those from experimental measurements. Based on the frequency response, the thicknesses of the refractory brick along three different directions were estimated using the impact-echo technique. The maximum difference between the estimated and actual thicknesses was observed to be less than 5 %. This result confirms the effectiveness of the impact-echo technique along with anisotropic property characterization to evaluate the thickness of the refractory ceramic.

우리나라 홍예교량의 비파괴진단 및 유지관리

이성민,Lee, S.M. 한국전산구조공학회 2006 전산구조공학 Vol.19 No.4

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.