확률론적 파괴역학을 도입한 CANDU 압력관의 예리한 결함에 대한 건전성평가

이준성,곽상록,김영진,박윤원,Lee, Jun-Seong,Gwak, Sang-Rok,Kim, Yeong-Jin,Park, Yun-Won 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4

This paper describes a probabilistic fracture mechanics(PFM) analysis based on Monte Carlo(MC) simulation. In the analysis of CANDU pressure tube, the depth and aspect ratio of an initial semi-elliptical surface crack, a fracture toughness value and delayed hydride cracking(DHC) velocity are assumed to be probabilistic variables. As an example, some failure probabilities of piping and CANDU pressure tube are calculated using MC method with the stratified sampling MC technique, taking analysis conditions of normal operations. In the stratified MC simulation, a sampling space of probabilistic variables is divided into a number of small cells. For the verification of analysis results, a comparison study of the PFM analysis using other commercial code is carried out and a good agreement was observed between those results.

결정질 실리콘 태양전지용 실리콘 기판의 표면 미세구조에 따른 곡강도 특성

이준성,권순우,박하영,김영도,김형준,임희진,윤세왕,김동환,Lee, Joon-Sung,Kwon, Soon-Woo,Park, Ha-Young,Kim, Young-Do,Kim, Hyeong-Jun,Lim, Hee-Jin,Yoon, Se-Wang,Kim, Dong-Hwan 한국재료학회 2009 한국재료학회지 Vol.19 No.1

The influence of various surface morphologies on the mechanical strength of silicon substrates was investigated in this study. The yield for the solar cell industry is mainly related to the fracturing of silicon wafers during the manufacturing process. The flexural strengths of silicon substrates were influenced by the density of the pyramids as well as by the size and the rounded surface of the pyramids. To characterize and optimize the relevant texturing process in terms of mechanical stability and the fabrication yield, the mechanical properties of textured silicon substrates were investigated to optimize the size and morphology of random pyramids. Several types of silicon substrates were studied, including the planar type, a textured surface with large and small pyramids, and a textured surface with rounded pyramids. The surface morphology and a cross-section of the as-textured and fractured silicon substrates were investigated by scanning electron microscopy.

L1210과 HL60 암세포에 대한 야생식물의 세포독성 검색

이준성,민병선,배기환,Lee, Jun-Sung,Min, Byung-Sun,Bae, Ki-Hwan 한국생약학회 1996 생약학회지 Vol.27 No.3

For the search of anticancer compounds from natural products, 43 plants were extracted with benzene and methanol, separately, and the extracts were screened for the cytotoxicity against L1210 and HL60 cancer cell lines. From the results, 22 samples in benzene extracts showed cytotoxicity against L1210 cells and 23 samples against HL60 cells, respectively. However, any methanol extracts did not exhibit cytotoxicity against two cancer cell lines, it suggested that cytotoxic compounds seemed to have low polarity. $ED_{50}$ values less than $5\;{\mu}g/ml$ were observed in 14 and 9 samples in benzene extracts against L1210 and HL60 cancer cells, respectively.

미세각막절개도를 이용한 데스메막박리 각막내피층판이식술의 국내 장기 임상 결과

이준성,박영걸,윤경철,Jun Sung Lee,Yeoung Geol Park,Kyung Chul Yoon 대한안과학회 2010 대한안과학회지 Vol.51 No.11

Purpose: To evaluate the long-term results of Descemet’s stripping automated endothelial keratoplasty in Korea (DSAEK). Methods: Seven patients with bullous keratopathy who underwent DSAEK and who were followed-up for more than 18 months were reviewed retrospectively. Best corrected visual acuity, refraction, corneal thickness, and endothelial cell count were examined before and after surgery. Results: The mean follow-up period was 19.9 ± 2.9 months (18 to 24 months), and the mean age was 61.42 ± 10.13 years (46 to 76 years). Six patients (85.7%) showed successful results after surgery. Best corrected visual acuity (logMAR) was significantly improved from 1.62 (median) to 1.15 (median) (p = 0.027) at one month after surgery and was maintained until the final follow-up period. There were no statistical differences in spherical ametropia or astigmatism before or 18 months after the operation. Graft failure was observed in one case, in which penetrating keratoplasty was performed 12 months after DSAEK. Conclusions: Long term results of DSAEK showed fast visual recovery, low ametropia and astigmatism. DSAEK may be a good option for the surgical management of corneal endothelial disease. J Korean Ophthalmol Soc 2010;51(11):1431-1437

건성안 환자에서 쇼그렌증후군의 빈도 및 임상양상

이준성,최원,이신석,윤경철.Jun Sung Lee. MD. Won Choi. MD. Shin Seok Lee. MD. Kyung Chul Yoon. MD. PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.4

Purpose: To investigate the prevalence and clinical aspects of Sjögren syndrome in patients who were diagnosed with dry eye syndrome in Korea. Methods: The medical records of patients who were diagnosed with dry eye syndrome in a dry eye clinic during a 2-year period (March 2008 to March 2010) and were followed up for more than 3 months were reviewed retrospectively. Results: A total of 206 patients were included in the present study. Fifty-eight patients (28%) had Sjögren syndrome and 39 patients (19%) showed primary Sjögren syndrome. Sjögren syndrome patients showed poorer results than non-Sjögren syndrome patients in ocular surface disease index score (OSDI), tear break up time, Schirmer test score, and ocular surface staining score using the Oxford scheme (p < 0.05). Among the patients with primary Sjögren syndrome, 27 patients were SSA (anti-Ro antibodies) or SSB (anti-La antibodies) positive and 12 patients were sero-negative. There were no statistically significant differences in objective or subjective parameters between the sero-positive and sero-negative groups. Conclusions: Sjögren syndrome was observed in 28% of all dry eye patients, in two-thirds of severe dry eye patients. Sjögren syndrome patients showed more severe clinical aspects than dry eye patients with non-Sjögren syndrome. Diagnosing Sjögren syndrome through systemic evaluation is necessary in the patients with severe dry eye. J Korean Ophthalmol Soc 2012;53(4):499-504

154㎸ 지중송전케이블에서 Wavelet을 이용한 Fault Location에 관한 연구

李俊晟(Jun-Sung Lee),文聖喆(Sung-Chall Moon),李鍾範(Jong-Beom Lee) 대한전기학회 2000 전기학회논문지A Vol.49 No.12

軍事施設 所在 古代 關防遺蹟의 관리 · 활용 방안 -임진강 · 한탄강 유역을 중심으로-

이준성(Lee, Jun-sung) 고조선단군학회 2021 고조선단군학 Vol.45 No.-

본고에서는 임진강 · 한탄강을 중심으로 군부대 및 군사시설 내에 위치하고 있는 고대 관방유적의 사례를 살펴보고, 관리 및 활용 방안을 제시하였다. 임진강 · 한탄강 유역은 삼국의 영역 확장 과정에서 오랜 기간 격전이 벌어진 경계 지대로서 다른 지역들에 비해 고대 관방유적이 많이 배치되어 있는 곳이다. 동시에 한국전쟁 이후 지금도 남과 북이 대치하고 있는 곳이기도 하다. 이러한 지역적 특성으로 인해 그동안 이 지역의 고대 관방유적에 관한 연구와 보존, 정비와 관련하여, 많은 수의 해당 유적이 군사시설이나 민간인 출입통제선(민통선) 지역에 분포하여 있다는 점이 제약사항으로 거론되어왔다. 이에 관한 해결책을 모색하는 과정에서 지난 2016년 제정된 「군 문화재보호 훈령」을 주목하였고, 그에 기반하여 관리 · 활용방안을 살폈다. 특히 「훈령」에 명시되어 있는 ‘군사재’의 개념을 활용하여 제도적인 측면에서 해결책을 찾을 수 있는 가능성을 상정해 보았다. 뿐만 아니라 ‘한 문화재 한 지킴이’, ‘문화재 돌봄사업’ 등 기존에 이미 마련되어 있는 정책을 활용하거나, 문화재청과 국방부가 진행하고 있는 ‘군 문화재 관리 역량 강화 교육’을 강화하는 것 역시 필요한 조치로 판단하였다. One of the constraints on the study and preservation of ancient fortress remains is that a large number of remains exist within military facilities. This is due to the fact that geopolitical conditions such as transportation routes and waterways of the Imjin River and Hantan River have not changed much since ancient times, and that the area that was a key military point in the past is still a key point. 「The Ordinance on the Protection of Military Heritage」, enacted in 2016, helps establish measures to manage and utilize these remains. This is because the concept of ‘military assets’ included in the Ordinance can be used to find solutions in an institutional aspect. In addition, it is also necessary to consider actively applying the existing cultural heritage utilization policies that the Cultural Heritage Administration has already implemented to the fortress remains that exist in military facilities.

U-health 표준화 동향

이준성(Lee Jun Sung) 한국통신학회 2014 한국통신학회 학술대회논문집 Vol.2014 No.6

방식층 보호장치의 설치에 따른 지중송전케이블

李俊晟(Jun-Sung Lee),李鍾範(Jong-Beom Lee),金瑛(Young Kim) 대한전기학회 2000 전기학회논문지A Vol.49 No.1

수ㆍ당대의 삼한 인식 변화와 『翰苑』의 편목 설정

이준성(Lee, Jun-Sung) 한국고대학회 2021 先史와 古代 Vol.- No.67

『翰苑』의 구성을 살펴보면 다른 지역에 비해 東夷 지역에 대한 관심이 높다. 동이 지역과 관련하여서는 7세기 당시 존재하고 있던 국가들 뿐 아니라 부여, 삼한 등 이미 존재하고 있지 않은 정치체들을 아울러 서술하고 있다. 또한 동이지역의 부여ㆍ삼한ㆍ고려ㆍ신라ㆍ백제 등 5개 편목 사이에는 부여→고구려, 삼한→신라 및 백제의 계승 관계가 설정되어 있다. 편찬 당시 동이 지역에 존재하고 있던 국가에 대한 관심의 범위가 그 역사적 계승에까지 닿아있었던 것이다. 결국 『한원』의 편찬 과정에서는 ‘역사적 삼한’과 ‘현실적 삼한’ 인식이 혼재될 가능성도 있었지만, 찬자는 ‘삼한’에 대해 면밀하게 분석하고 대응하는 대신 상대적으로 내용 파악이 용이한 사서를 중심으로 삼한 편목을 구성하였다. 그것은 漢의 계승을 통한 中華 재건을 표방하던 수ㆍ당대 대외인식을 반영하는 것인 동시에, 아직 동이 지역에 대한 종합적 이해에 이르지 못하던 상황을 반영해준다. Looking at the composition of Hanwon, it is found to show a higher interest in the region of Eastern Barbarians(東夷) than in other regions. Regarding the region of Eastern Barbarians, not only the countries that existed in the 7th century, but also the political bodies that already ceased to exist, such as Buyeo and Samhan, were described. In addition, it established a succession relationship from Buyeo → Goguryeo, Samhan → Silla and Baekje among the five of Buyeo, Samhan, Goguryeo, Silla, and Baekje in the region of Eastern Barbarians. At the time of compilation, the scope of interest in the countries that existed in the region of Eastern Barbarians reached its historical succession. In the end, the author of 『Hanwon』 would have had no choice but to organize a compilation on Samhan focusing on history books that were relatively easy to grasp instead of closely analyzing and addressing ‘Samhan’ after thinking over the difference between ‘Historical Samhan’ and ‘Real Samhan.’ It reflects the external perception in the Sui and Tang Dynasties that advocated the reconstruction of China(中華) through the succession of Han(漢), and at the same time reflects the situation in which a comprehensive understanding of the region of Eastern Barbarians was not yet reached.