보통계약약관의 성질

이원석 한국사법행정학회 1966 사법행정 Vol.7 No.11

수도권 대중교통 통합요금제를 반영한 지하철 수요예측 방법

이원석,김채만,Lee, Won-Suk,Kim, Chae-Man 대한교통학회 2010 교통 기술과 정책 Vol.7 No.2

의료용 초음파 위상배열 트랜스듀서의 열 분산 방안

이원석,노용래,Lee, Wonseok,Roh, Yongrae 한국음향학회 2015 韓國音響學會誌 Vol.34 No.3

초음파 영상 품질의 향상을 위해 트랜스듀서의 구동전압을 높이게 되면 트랜스듀서에서 열이 발생하여 환자의 피부 화상 및 트랜스듀서의 성능 저하를 초래할 수 있다. 따라서, 이렇게 온도가 상승하지 않도록 트랜스듀서 내의 열을 효율적으로 분산할 수 있는 방안에 대해 연구하였다. 이때 열 분산 해석 대상으로 중심주파수가 3 MHz이고 32채널을 가진 위상배열 트랜스듀서를 선정하였다. 먼저 트랜스듀서의 동작에 따른 발열 구조를 이론적으로 분석하였고, 그 결과로서 재료의 감쇠와 음압의 크기가 발열에 영향을 미치는 것을 확인하였다. 나아가 유한요소 해석을 통해 트랜스듀서 구성소자의 물성이 열 분산에 미치는 영향을 분석하였다. 분석된 결과를 바탕으로 트랜스듀서 내 열이 잘 분산되기 위한 구성소자의 열물성을 정하였다. 도출된 열 물성을 유한요소 해석 모델에 적용한 결과 환자와 접촉되는 부분인 음향렌즈의 최고온도가 원래 값의 51 %로 저하되었다. When the driving voltage of an ultrasound transducer is increased to improve the quality of ultrasound images, heat is generated inside the transducer that can cause patient's skin burn and degradation of transducer performance. Hence, in this paper, a method to disperse the heat of the transducer has been studied. The phased array transducer having 3 MHz center frequency and 32 channels was selected for analyses of the thermal dispersion. First, mechanism of the heat generation was investigated in relation to the transducer operation through theoretical analysis, and material damping and sound pressure amplitude were confirmed to be influential on the heat generation. Further, we investigated the effects of the properties of the materials constituting the transducer on the thermal dispersion through finite element analysis. Based on the analysis results, we determined the thermal properties of the constituent materials that could facilitate the thermal dispersion inside the transducer. The determined thermal properties were applied to the finite element model, and the results showed that the maximum temperature at an acoustic lens contacting with a patient was decreased to 51 % of its initial value.

En bloc Resection for Right Colon Cancer Directly Invading Duodenum or Pancreatic Head

이원석,전호경,최성호,이우용 연세대학교의과대학 2009 Yonsei medical journal Vol.50 No.6

Purpose: We undertook this study to analyze clinical features and surgical outcome of en bloc resections of the right side colon cancer directly invading duodenum and/or pancreatic head. Materials and Methods: The records of all patients who underwent en bloc resection of duodenum and/or pancreas for right colon cancers were analyzed retrospectively. From September 1994 to September 2006, 1,016 patients underwent curative right hemicolectomy. Nine patients (0.9%) had en bloc resection of a right side colon cancer with duodenum or pancreatic head invasion. Results: The median operative time was 320 minutes (range, 200-420) and the median blood loss was 700 mL (range, 100-2,000). The mean size of tumor was 6.6 cm (range, 3.2-10.7). The mean preoperative carcinoembryonic antigen (CEA) was 10.6 ng/mL (range, 0.2-50.8). There was no 30 day perioperative mortality. The median diseasefree survival was 23.5 months [95% confidence interval (CI) 5.2-41.8] and the median overall survival was 28.1 months (95% CI 9.7-46.5). Conclusion: In patients with locally advanced right side colon cancer that directly invades the duodenum or pancreas can be safely resected with curative potential with minimum morbidity and mortality. Long term disease free survival can occur in a significant number of patients undergoing curative en bloc resection in this particular subset of patients. Purpose: We undertook this study to analyze clinical features and surgical outcome of en bloc resections of the right side colon cancer directly invading duodenum and/or pancreatic head. Materials and Methods: The records of all patients who underwent en bloc resection of duodenum and/or pancreas for right colon cancers were analyzed retrospectively. From September 1994 to September 2006, 1,016 patients underwent curative right hemicolectomy. Nine patients (0.9%) had en bloc resection of a right side colon cancer with duodenum or pancreatic head invasion. Results: The median operative time was 320 minutes (range, 200-420) and the median blood loss was 700 mL (range, 100-2,000). The mean size of tumor was 6.6 cm (range, 3.2-10.7). The mean preoperative carcinoembryonic antigen (CEA) was 10.6 ng/mL (range, 0.2-50.8). There was no 30 day perioperative mortality. The median diseasefree survival was 23.5 months [95% confidence interval (CI) 5.2-41.8] and the median overall survival was 28.1 months (95% CI 9.7-46.5). Conclusion: In patients with locally advanced right side colon cancer that directly invades the duodenum or pancreas can be safely resected with curative potential with minimum morbidity and mortality. Long term disease free survival can occur in a significant number of patients undergoing curative en bloc resection in this particular subset of patients.

보완 골격 알고리듬을 이용한 구난로봇의 자체 충돌감지/회피

이원석,홍성일,박규현,강윤식,Lee, Wonsuk,Hong, Seongil,Park, Gyuhyun,Kang, Younsik 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.4

This paper handles self-collision avoidance for a rescue robot with redundant manipulators. In order to detect all available self-collisions in advance, minimum distances between arbitrary robot parts should be monitored in real-time. For the minimum distance estimation, we suggest a modified method from a previous skeleton algorithm which has less computation burden and realize collision avoidance based on a potential function using the proposed algorithm. The resultant command by collision avoidance should not disturb a given primary task, so null-space of joint solution from a CLIK is utilized for collision avoidance by a gradient projection method.

주식회사의 성립과 권리의무의 관계

이원석 단국대학교 법학연구소 1965 법학논총 Vol.6 No.1

TC-16ADPSK을 사용한 이종 정보 동시 전송용 변조방식의 성능 분석

이원석,강희훈,이성백 대한전자공학회 2000 電子工學會論文誌 IE (Industry electronics) Vol.37 No.5

본 논문에서는 TC-16ADPSK(Trellis Coded-16 Amplitude Differential Phase Shift Keying)를 사용하여 데이터 량이 서로 다른 정보(Information)를 동시 전송하기 위한 방식을 제안한다. 제시한 시스템의 성능 분석은 부가적인 화이트 가우시언 잡음(AWGN : Addictive White Gaussian Noise) 채널과 레일라 이 페이딩(Rayleigh Fading) 채널에 대한 비트오율(Bit Error Rate)을 기준으로 한다. 제안한 방식은 정보량이 다른 두 가지 정보를 한 채널에 동시 전송하며 적은 량의 데이터는 Star-16APSK의 신호 격자중에 크기를 결정도록 매핑하고 다른 정보는 위상을 결정하는데 사용된다. 정보 데이터 검파시 ASK와 DPSK 다른 검파 방식을 사용하므로 통합된 정보가 쉽게 분리되며 한 채널에 각각 다른 정보를 효율적으로 전송이 가능하다. 매트랩 통신 툴박스를 사용하여 BER 성능 결과를 분석한 결과, 제안한 방식은 동일 SNR에 대해 서 그레이 코드를 사용한 경우가 0.5㏈-1.5㏈ 정도의 코딩 이득을 나타내었다. A TC-16ADPSK scheme for transmitting different kinds of information simultaneously is proposed in this paper. The scheme is designed for simultaneously transmitting two kinds of Information on one channel. In signal mapping, a data of two kinds of information is used to phase modulation on Star-16APSK constellation and the other to amplitude modulation. In detection, each data independently recovers from mixing signal on each detector Therefore, we can transmit two kinds of Information on one channel can be transmitted efficiently. BER performance of the proposed scheme is analyzed on AWGN channel and Rayleigh fading channels on a computer with Matlab communication toolbox. On same SNR, the Gray code mapping has more 0.5-1.5dB coding gains than Ungerboeck's code mapping gains.

논문 : 국학자 유사배의 공자상

이원석 동국사학회 2005 동국사학 Vol.41 No.-

[책마당 (2)] 『1984』는 아직도 우리 곁에 있다

이원석 대한기독교서회 2016 基督敎 思想 Vol.687 No.-

胡瑗의 變易思想 硏究

이원석 한국유교학회 2014 유교사상문화연구 Vol.57 No.-

胡瑗은 이른바 易三義說에 대한 비판을 바탕으로 王弼의 소극적 실천론을 극복하고자 했다. 역삼의설이란 역에 이(易), 變易, 不易 세 가지 의미가 있다는 학설인데, 이것은 無를 근본으로 삼는 존재론으로 귀결된다. 호원은 이 세 가지 의미 중 변역만이 易의 본의에 부합한다고 봄으로써 무의 존재론에서 벗어나고자 했다. 하지만 변역의 논리만 갖고서는 적극적 실천을 뒷받침할 수 없기 때문에, 그는 仁義의 마음이야말로 실천의 궁극적 근거가 된다는 견해를 제시한다. 그에 따르면, 세계에 관철되는 변역의 원리를 파악하되, 그 원리에 그대로 따름으로써 일신의 안위만을 도모하면 안 된다. 대신 변역의 원리에 따라 도래할 위기의 국면을 미리 인지하고서, 그 위기로부터 백성을 구제할 방안을 강구하고 그것을 실행시켜야 한다. 이는 자연의 객관적 법칙과 인간의 주관적 실천 사이의 관계 방식에 관한 호원 나름의 대답이기도 했다. Hu Yuan, a thinker who lived in Northern Song dynasty, criticized ‘the theory of three meanings in Yi(易)’, and on the basis of that criticism he tried to overcome the Wang Bi's theory of practice which had the characteristic of passiveness. According to ‘the theory of three meanings in Yi’, there are three meanings of Yi , that is ‘easiness’, ‘change’, and ‘unchangeability,’ but Hu Yuan thought that the theory would lead to the ontology of nothingness(無). He insisted that only the meaning of change might accord with that of ‘Yi’, and sought to get out of the ontology of nothingness. However, the principle of change could not sufficiently support positive practice. So he suggested that the mind of humaneness and righteousness can be original source of it. According to him, it is not desirable to only follow the principle of change and to secure oneself. Instead, one should notice the time of disaster to come by applying the principle of change and make a great effort to find and execute ways of taking peoples out of disaster. This is also the Hu Yuan's solution to the relation between nature's objective law and human's subjective practices.