COREA 프로젝트를 위한 검출기 모의실험

이성원,강혜성,Lee, Sung-Won,Kang, Hye-Sung 한국천문학회 2006 天文學論叢 Vol.21 No.2

The COREA (COsmic ray Research and Education Array in Korea) project aims to build a ground array of particle detectors distributed over Korean Peninsular, through collaborations of high school students, educators, and university researchers, in order to study the origin of ultra high energy cosmic rays. COREA array will consist of about 2000 detector stations covering several hundreds of $km^2$ area at its final configuration and detect electrons and muons in extensive air-showers triggered by high energy particles. During the intial phase COREA array will start with a small number of detector stations in Seoul area schools. In this paper, we have studied by Monte Carlo simulations how to select detector sites for optimal detection efficiency for proton triggered air-showers. We considered several model clusters with up to 30 detector stations and calculated the effective number of air-shower events that can be detected per year for each cluster. The greatest detection efficiency is achieved when the mean distance between detector stations of a cluster is comparable to the effective radius of the air-shower of a given proton energy. We find the detection efficiency of a cluster with randomly selected detector sites is comparable to that of clusters with uniform detector spacing. We also considered a hybrid cluster with 60 detector stations that combines a small cluster with ${\Delta}{\iota}{\approx}100m$ and a large cluster with ${Delta}{\iota}{\approx}1km$. We suggest that it can be an ideal configuration for the initial phase study of the COREA project, since it can measure the cosmic rays with a wide range energy, i.e., $10^{16}eV{\leq}E{\leq}10^{19}eV$, with a reasonable detection rate.

소아 성대결절 : 음성치료 후 음성장애지수를 이용한 장기 추적관찰 결과

이성원,노종렬,최승호,김상윤,남순열,Lee, Sung-Won,Roh, Jong-Ryeol,Choi, Seung-Ho,Kim, Sang-Yoon,Nam, Soon-Yuhl 대한후두음성언어의학회 2006 대한후두음성언어의학회지 Vol.17 No.2

Objectives : The purpose of this paper is to know the efficacy of voice therapy for vocal fold nodules in children. Materials and Methods : Sixty two patients with vocal nodules(46 boys and 16 girls) were retrospectively reviewed. Age ranged from 4 to 15 years with mean age of 8 years. Questionnaire survey was carried out with voice handicap index, at pretherapy and post-therapy(3 months and 5 years after voice therapy). Results : Sixty two percent of the patients showed improvement by voice therapy. Twenty five patients continued education at home after voice therapy, but only eight childrens were included this group in pre-school aged children. Voice handicap index was improved in 3 months and 5 years after voice therapy. In contrast, pre-school children group showed slight aggravation in 5 years, especially in emotional subdomain. Conclusion : Voice therapy is effective primary treatment in children with vocal fold nodules. Different result between preschool aged children and school aged group shows needs for age specific approach of voice therapy.

썬루프 디플렉터 각도에 따른 썬루프 개구부 주변 유동 특성 연구

이성원,신성룡,최의성,이주완,Lee, Sung Won,Shin, Seongryong,Choi, Eui Sung,Yi, Juwan 한국음향학회 2018 韓國音響學會誌 Vol.37 No.5

본 연구에서는 차량에 장착되는 파노라마 썬루프 디플렉터의 각도에 따른 개구부 주변 유동 특성을 분석하고 공력소음에 미치는 영향을 확인하였다. 파노라마 썬루프 개방 후 주행 시 공력소음을 저감하기 위해 메쉬 디플렉터를 장착하는데, 후방향인 기존 메쉬 디플렉터 각도를 전방향으로 변경하였을 때 유동 변화와 공력소음 기여도를 분석하였다. 이를 위하여 CAT(Computer Aided Test)와 실차 풍동 평가를 진행하였으며, 전방경사형 디플렉터에서 기존 디플렉터 대비 원활한 유동의 흐름과 유동 방향의 상향으로 공력소음이 개선되는 것을 확인하였다. 전방경사형 디플렉터 적용 시 동등한 원가에서 공력소음을 개선할 수 있을 것으로 기대된다. In the present study, flow characteristics and wind noises around the sunroof opening are analyzed variation with panoramic sunroof deflector angle. A mesh deflector is attached to reduce wind noise while a car is driving with the panoramic sunroof opening. A new forward inclined type deflector was invented to improve wind noise. The effect of this new concept of mesh deflector on the open-panoramic flow characteristics and wind noises were studied with CAT (Computer Aided Test) and wind tunnel test, which shows the reduction of open-panoramic wind noises such as sunroof buffeting, sunroof booming, and turbulent noise. Therefore, the forward inclined type deflector can efficiently improve wind noise with the same production cost.

한 · 중 전통가구 장식의 상징적 의미를 활용한 디자인 연구

이정(Li Jing?Lee),이성원(Lee, Sung Won) 한국디자인문화학회 2018 한국디자인문화학회지 Vol.24 No.3

문양(紋樣)은 각 나라의 역사와 함께 장식성과 의미상징의 두 가지 기능을 가지고 있다. 특히, 한⋅중 전통적 요소에 있어서 가구에 사용되는 문양은 중요한 요소이자 양국의 귀중한 문화자산이다. 본 논문의 목적인 한 · 중 양국의 전통가구 문양의 상징적 의미를 활용한 디자인 연구를 통해 현대 가구 디자인에 있어 전통문양의 새로운 발전 방향과 응용 방안을 제시하고자 하였으며, 양국의 문화와 정서를 이해를 할 수 있는 기초적 자료를 제공하였다. 본 논문의 연구 범위는 한 · 중, 특히 14세기 말부터 20세기 초의 조선 시대와 중국 명 · 청시기 전통가구를 중심으로 전통문양의 조형적 측면과 상징적 의미에 대한 연구이다. 연구 방법으로 첫째, 전문서적, 논문, 인터넷 등 선행연구 자료의 조사, 검토, 비교 분석을 통하여 한 · 중 전통가구(傳統家具)와 문양에 대한 연구를 진행하였으며, 둘째, 문양의 소재와 문양의 상징적 의미 고찰을 통해 한 · 중 전통가구 문양의 공통점과 차이점을 비교 분석하였고, 셋째, 한 · 중 전통가구에 사용된 장식문양의 사례분석과 한 · 중 전통문양의 관련 이론연구를 중심으로 현대 가구 디자인에 있어 전통문양의 활용 방안에 대하여 제시하였다. 본 연구를 통하여 조선 시대와 명 · 청시기 가구의 문양에 대하여 체계적으로 이해하고, 전통문양이 현대가구 디자인에 잘 융화되어, 전통문화의 소중한 문화재로써 전승되기를 기대한다. The pattern has two functions in addition to the history of each country: ornament and semantic symbol. In particular, patterns used in traditional furniture in Korea and Chinese traditional elements are important. It is a valuable cultural asset of both countries. The purpose of this paper is to present a new development direction and application of traditional patterns in contemporary furniture design through the study of design using the symbolic meaning of traditional furniture patterns in both Korea and China. To understand the culture and emotion of both countries To provide the basic data. The research scope of this thesis is the study on the formative aspect and symbolic meaning of traditional patterns in Korea and China, especially in the Joseon dynasty from the end of the 14th century to the beginning of the 20th century and the traditional Chinese furniture. First, research on traditional Korean furniture and patterns was conducted through researches, reviews, and comparative analyzes of previous research materials such as specialized books, papers, and the Internet. Second, the study of the symbolic meaning of materials and patterns in patterns Third, the analysis of the patterns of decorative patterns used in Korean and Chinese traditional furniture and the related theories of Korean and Chinese traditional patterns. The application of the pattern is suggested. Through this study, we will systematically understand the pattern of furniture of Joseon Dynasty and Ming & Qing Dynasties period furniture, and it is expected that traditional patterns will be well integrated into modern furniture design and handed down as a precious cultural property of traditional culture.

Squeezenet 기반 포트홀 탐지에서 데이터셋 구성 기법

이성원(Sung Won Lee),안광은(KwangEun An),정영주(YoungJu Jeong),류승기(Seung-ki Ryu),서동만(Dongmahn Seo) 한국정보과학회 2018 한국정보과학회 학술발표논문집 Vol.2018 No.12

다른 매질 사이에서의 완전 투과율 파동 제어를 위한 더블 유닛 탄성 메타서페이스

이성원(Sung Won Lee),신예정(Ye Jeong Shin),박홍우(Hong Woo Park),승홍민(Hong Min Seung),오주환(Joo Hwan Oh) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.5

상왕(商王)의 출정(出征)과 ‘방인(方人)’의 여정

이성원 ( Lee Sung Won ) 호남사학회 2022 역사학연구 Vol.85 No.-

갑골문의 기록에 의하면 상나라는 공방, 토방, 강방, 주방, 인방 등 중원 외곽의 강력한 방국들과 주기적으로 군사적 충돌을 하였고 필요한 경우 상왕은 군사적 출정을 하였다. 이들 지역은 상읍으로부터 500~800킬로미터 거리였기에 이러한 군사적 출정을 다녀오려면 두 달 혹은 석 달이 시간이 소요되는 장도의 원정이었다. 상왕의 출행은 정례적인 卜旬 복사의 사례를 통해서도 확인할 수 있다. 10일간격으로 행해지는 점복을 기록한 복순 복사에서 상왕이 상읍 이외의 지역에 머무르는 경우에는 반드시 그 소재지를 기록함으로써 상왕의 이동 경로를 추론해 볼 수 있다. 복순 복사에 의하면 상대 후기 상왕이 동남 회하유역으로 잦은 원정을 하였고 그 과정에서 여러 경유지에서 복순 복사를 했음을 확인할 수 있었다. 왕이라도 상읍의 출입에는 방위, 택월, 택일 등의 신탁이 허락해야 출입 할 수 있었다. 한편 전쟁에서 생포된 방인들은 상왕과 극적인 대비를 이루는 여정을 보여준다. 특히 강방의 강족들의 기록을 중심으로 검토하면, 그들은 전쟁에서 생포되어 상읍까지 수백 킬로의 험난한 장도를 감내하며 호송되었다. 그 과정에서 많은 이들이 희생되었을 것이며 비록 살아서 상읍에 도착하여도 그들 대부분은 벌제의 식을 통해 제사의식의 희생이 되었다. 즉 그들은 고향을 떠나 와서 이승이 아닌 저 피안의 세계로 돌아올 수 없는 여정을 떠나게 되었다. 그 외의 방인들은 신체의 일부가 절단되거나 훼손되는 육형을 받아야 했고, 남은 여생동안 불구가 되어 내밀한 직무를 수행해야 했다. According to oracle bone scripts, Shang dynasty often waged war against strong nations around central China, called Fang[方], for examples Gong Fang [方], Tu Fang [土方], Qiang Fang [羌方], Zhou Fang[周方], Ren Fang[人方], etc. Sometimes the king of Shang dynasty went to war in person. It was a long expedition to take two or three months at least because it was five or eight hundred kilometers from those nations to Shang. The fact that the king made a journey can be found in the augural scripts which had been written after an fortune forecast for coming ten days, called Bu Xun [卜旬]. Wherever the king might be, he had to perform ‘the ten days forecast’. So when he performed the forecast outside the capital city, he had to write where he was on an oracle bone. According to those scripts we can find the itinerary of the king, especially outside the capital city. It was very important for even king to decide which direction, which month, and which day depended on oracle bone forecast in going out or entering the capital city. On the other hand, compared to that of king, the itinerary of foreigners who had been captured alive in the battle with Shang showed a dramatic contrast. Captured in the battle, they were escorted to Shang hundreds of kilometers away. It was for the first time for them to make a long journey, though it must be a terribly tortured journey to death. Even if they were alive after a tortured journey, they had to meet the more tragic fate. Most of them had to be decapitated as a sacrifice for natural gods and ancestral gods in the ritual ceremony of Shang. A human sacrifice was usual and culminating in Shang dynasty. If they were alive, the rest of them had to be punished to cut the part of their body, for examples a penis, a leg, a nose, skins, etc, and had to serve a kind of shamanistic jobs.

노트북 컴퓨터용 무선 데이타통신 모듈의 개발에 관한 연구

이성원(Sung-Won Lee),박경수(Kyung-Su Park),조동호(Dong_Ho Cho) 한국통신학회 1993 한국통신학회 학술대회논문집 Vol.12 No.1

등가 S-N 선도 모형에서의 굴착기 연료탱크 마운팅부 내구수명 예측 신뢰성 향상 방안 연구

이성원(Sung-Won Lee),정진욱(Jin-Wook Jeong),김성재(Seong-Jae Kim) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.5

It is challenging to estimate the fatigue life of construction equipment consisting of a welded joint using field structure test owing to the uncertainty of the S-N curve. IIW recommends different S-N curves for various welded joint types. However, there is no way to define an appropriate curve considering complex design shape and strain gauge characteristics. This paper proposes an equivalent S-N curve method based on the relationship between IIW effective notch stress and virtual stress using finite element analysis. Moreover, a case study was conducted for the excavator fuel tank. The proposed method is expected to enhance accuracy and consistency in calculating the fatigue life for the welded structure of construction equipment.

증례보고 : 노인환자에서 측와위하 짧은 내시경 수술 후 일측성에서 양측성으로 발전한 급성 폐부종

이성원 ( Sung Won Lee ),김미운 ( Mi Woon Kim ) 대한마취과학회 2008 Korean Journal of Anesthesiology Vol.55 No.5

Although pulmonary vascular permeability and gravity changes have been known to be the mechanism of pulmonary edema, yet the etiology of pulmonary edema remains speculative. The multiple conditions such as congestive heart failure, fluid overload, hypoalbuminemia, upper air way obstruction, increased pulmonary artery pressure and laparoscopic surgery cause poor pulmonary circulatory condition. Pulmonary edema usually occurs bilaterally, but unilateral pulmonay edema is uncommon entity. Unilateral pulmonary edema was reported to occur in special circumstances such as one lung ventilation, lateral decubitus position and unilateral pulmonary damage. We experienced abruptly onset and rapid healing pulmonary edema from unilateral to bilateral after brief laparoscopic operation under lateral decubitus position. Thus, we report this case as complicated condition of acute pulmonary edema in elderly patient without fluid overload, long operation time. (Korean J Anesthesiol 2008;55:644~7)