터널 라이닝 단면력 역산을 위한 유지관리 내공변위계측시스템 적용 연구

이대혁(Dae-Hyuck Lee),김기선(Ki-Sun Kim),한일영(Il-Yeong Han),박연준(Yeon-Jun Park),유광호(Kwang-Ho You) 한국암반공학회 2001 터널과지하공간 Vol.11 No.2

TiO2 귀금속을 첨가한 WO3 후막 센서의 제조 및 NOx 감응 특성

이대식,한상도,손영목,이덕동 ( Dae Sik Lee,Sang Do Han,Young Mok Son,Duk Dong Lee ) 한국센서학회 1997 센서학회지 Vol.6 No.4

NO_x sensors using tungsten oxide films as a base material were prepared and their electrical and sensing characteristics have been investigated. The WO₃ thick films doped with SnO₂ or TiO₂ showed higher sensitivity and better sorption characteristics to NOx gas than the pure WO₃ films material in air at operating temperature of 400 ℃. By addition of noble catalysts, such as Ru or Au, to the TiO₂-WO₃ thick films, their sensitivity, recovery and selectivity to NO_x gas were found to be more enhanced.

광범위한 심부 정맥계의 경색:후두개와 수술 후 발생한 드문 합병증

이대규 ( Dae Kyu Lee ),황승균 ( Sung Kyun Hwang ),김동규 ( Dong Gyu Kim ),정희원 ( Hee Won Jung ),한문희 ( Moon Hee Han ) 대한뇌종양학회 2002 대한뇌종양학회지 Vol.1 No.1

Objective and Importance:Infarction of the deep cerebral venous system is a rare clinical entity and is different from the infarction of the superficial system in its presenting symptoms, severity of the disease and prognosis. The authors present a case of extensive infarction of the deep venous system associated with a postoperative epidural abscess in the posterior fossa following the surgery of a vestibular schwannoma. Pathogenesis is also discussed with diagnosis and treatment. Clinical Presentation:A 43-year-old woman underwent total removal of a vestibular schwannoma through retromastoid suboccipital craniectomy. The immediate postoperative course was uneventful. A high fever occurred on the eighth postoperative day and she subsequently became stuporous. Computed tomography(CT) revealed a crescent-shape lesion at the epidural space around the craniectomy site. Diffuse low-density lesions in the bilateral basal ganglia, thalamus and frontal paraventricular white matter were also seen. Intervention:Revision of the previous wound was performed and the epidural abscess was removed. Postoperative magnetic resonance(MR) imaging showed extensive infarction in the same areas that were seen in the previous CT scan. Occlusions in the straight and lateral sinus were demonstrated by MR venography. Anticoagulation therapy was started and the neurological status of the patient gradually improved. Conclusion:Although an infarction of the deep cerebral venous system is rare, it may occur in patients with postoperative intracranial infection in the vicinity of the dural sinus. A suspicion and rapid diagnosis are important, so that the morbidity of the disease may be reduced and the prognosis for the patient may be improved if an adequate treatment regimen would be taken early.

『대동여지도』로 읽는 19세기 조선

이대화(Lee, Dae Hwa),한미라(Han, Mi Ra) 다빈치미래교양연구소 2021 교양학연구 Vol.- No.15

이 논문은 한국사 교육에서 새로운 자료를 발굴하거나, 기존의 자료를 분석하는 관점을 다양화함으로써 교양교육의 목표를 효과적으로 달성하는 방안을 제시하고자 한다. 이를 위해 조선후기 고지도 제작기법과 수록 내용을 통해 제작 당시의 사회상을 유추하는 연구방법을 고안하였다. 1860년대에 완성된 『대동여지도』는 조선후기에 제작된 지도의 대표작으로 매우 높은 평가를 받고 있다. 그런데 『대동여지도』를 지은 김정호의 가계나 생애, 지도와 지리지 제작 방법과 과정 같은 정보는 거의 알려져 있지 않았다. 그래서 1920년대부터 『대동여지도』와 김정호에 대해 과장된 이야기가 창작되어 대중들에게 유포되었다. 대표적으로, 전국을 직접 답사하여 지도를 그렸다든가, 당시 조선사회와 지배층이 지도의 가치를 이해하지 못했다는 것이 대표적이다. 1930년대에는 더욱 과장된 이야기가 창작되었다. 김정호가 대동여지도를 완성했을 당시의 실권자인 흥선대원군이 지도를 본 뒤, 국가 기밀을 누설한다는 혐의를 씌워 김정호를 처벌하고 지도를 새긴 목판은 불에 태웠다는 내용이 대표적이다. 이처럼 김정호와 『대동여지도』에 대해 잘못 알려진 내용이 1970년대까지 초등학교 국어 교과서에 실려 있었다. 그 결과 적지 않은 한국인은 19세기 후반의 조선은 김정호의 업적을 제대로 판별하지 못하는 미개한 사회라는 선입견을 갖게 되었다. 또한 초등교육과 중등교육 한국사 교육과정에서 19세기는 세도정치와 민란, 조세제도의 문란함 등을 중심으로 교육하기 때문에, 김정호와 『대동여지도』가 인정받을 수 없었다는 데 개연성을 더해주고 있다. 결과적으로 기존의 역사교육은 19세기에 대한 선입견을 형성하고 있는 셈이다. 하지만 김정호에 관해 알려진 기존의 이야기는 대부분 역사적 근거가 전혀 없는 창작물임이 학술적 연구에 의해 차례차례 입증되고 있다. 애초에 김정호의 고생담을 창작한 의도는 악의적이지 않았다. 김정호를 부각시켜 식민치하의 조선인에게 고난과 역경을 극복하는 인물상을 제시하려는 목적이었다. 그러나 조선총독부가 교과서 내용으로 채택하면서, 『대동여지도』의 가치를 알아보지 못했던 조선왕조의 무능함을 강조하고, 김정호의 고생담을 통해 조선사회가 미개하였음을 강조하는 방향으로 왜곡된 것이다. 최근의 한국사 및 지리학 분야에서 발표된 연구를 토대로 대동여지도를 다시 들여다보면, 19세기 조선이 낙후되고 고립된 ‘쇄국’의 공간이 아니라는 점을 알 수 있다. 그러므로 대동여지도라는 고지도(이자 고전 자료)를 소재로 19세기 조선을 다시 해석한다면, 19세기에 대한 부정적인 선입견을 극복할 수 있을 것이다. 또한 학습자들이 새로운 시각을 습득하여 사유의 범위를 확장함으로써, 대학 교양교육의 목표를 달성하게 될 것이다. This thesis presents a method to reach the goal of liberal arts education effectively by discovering a new data or by diversifying viewpoints in analyzing existing data in Korean history education. For this purpose, a study method was designed to infer the state of society at the time of production of the old map in the late Joseon through its production technique and its contents. 『Daedong Yeojido』 completed in the 1860s is the most well-known map among those were produced in the late Joseon period. However, not much information of Kim Jeongho, the producer of 『Daedong Yeojido』 such as his family line, life and the method and process of production of the map and the book of geography was shared to the public. Thus, from the 1920s, the exaggerated stories about 『Daedong Yeojido』 and Kim Jeongho were created and circulated among the public. The stories such as Kim Jeongho drew the map by traveling all over the country or the society of Joseon and its ruling class at that time didn't understand the value of the map are the most popular ones. Even more exaggerated stories were created in the 1930s. After Heungseon Daewongun, who held the actual authority when Kim Jeongho completed Daedong Yeojido, saw the map, punished Kim Jeongho for leaking national securities and burned the woodblock inscribed with the map was one of the major stories created. Like this, distorted information about Kim Jeongho and 『Daedong Yeojido』 were published in elementary Korean textbook until 1970s. As a result, many Korean were biased against the late 19th century Joseon as an uncivilized society that couldn't appreciate the value of Kim Jeongho's work. Also, since curriculum of elementary education and Korean history in Middle and High school education teach the 19th century focusing on power politics, civil riot and corruption in taxation system it adds more weight that Kim Jeongho and 『Daedong Yeojido』 were unappreciated. As a result, current history education forms the biased idea toward 19th century. However, it is proved one by one in academic researches that the majority of existing stories related to Kim Jeongho are fictions without any historical basis. In the first place, the intention of creating the story of Kim Jeongho's suffering didn't mean any harms. It served a purpose to present an image of a person who overcame the agony and trouble by the modeling of Kim Jeongho for the people of Joseon under colonial rule. Nonetheless, when the Japanese Government General of Korea adopted that story for the textbook, it was distorted toward the direction to emphasize the incompetence of the Joseon Dynasty that was unable to recognize the value of 『Daedong Yeojido』 and to stress that the society of Joseonis uncivilized through Kim Jeongho's story of suffering. To take an another look at Daedong Yeojido based on recently published researches in the field of Korean History and Geography, it is known that the 19th century Joseon was not a “secluded” place that is underdeveloped and isolated. Therefore, when we reinterpret the 19th century Joseon through an old map (also a classical material) called Daedong Yeojido the negative prejudice toward the 19th century could be overcome. Also, the learners will achieve the objective of university liberal arts education by broadening their range of thought when they obtain new perspectives.

차분진화 알고리즘을 이용한 탄소배출권 거래제 및 Valve-Point Effect 반영 화력발전기 경제급전

이대경(Dae-Kyung Lee),이다한(Da-Han Lee),김동현(Dong-Hyun Tony Kim) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

생물학적 입상화 SBR에서 질소·인 제거 시 온도영향

이대주 ( Dae Ju Lee ),홍성완 ( Sung Wan Hong ),윤금희 ( Geum Hee Yun ),이한샘 ( Han Saem Lee ),윤주환 ( Zu Whan Yun ) 한국물환경학회(구 한국수질보전학회) 2014 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2014 No.-

Spiral CT에서 Interpolation이 선량증가에 미치는 영향에 관한 연구

이대규(Dae kyoo Lee),남윤철(Yoon Chul Nam),김문찬(Moon Chan Kim),한동균(Dong Kyoon Han) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

The purpose of this study is to recognize how much dose and scan length increased by interpolation in spiral scan and to understand about correlation with factors such as beam collimation and pitch. We measured dose and scan length changing pitch and beam collimation using the GE company equipments.

유도전동기 고정자 자속 기준 벡터제어에서 순환 최소자승법을 이용한 회전자 저항 및 고정자 과도 인덕턴스 추정

이대한(Dae-Han Lee),최종우(Jong-Woo Choi) 전력전자학회 2019 전력전자학술대회 논문집 Vol.2019 No.11

Dual Source CT에서 High-pitch Cardiac Scan Mode를 이용한 관상동맥 검사의 유용성

이대규(Dae Kyu Lee),김문찬(Moon Chan Kim),방성호(Sung Ho Bang),한동균(Dong Kyoon Han) 대한CT영상기술학회 2010 대한CT영상기술학회지 Vol.12 No.1

Purpose To evaluate the usefulness of prospectively ECG gated high-pitch cardiac scan for CT coronary angiography(CTCA) using dual source CT by analyzing the dose effect and image quality for CTCA protocols. Materials and methods CTCA was performed by using 5 current clinical protocols to evaluate effective dose and organ dose in prima1y beam area with anthropomorphic female phantom and glass dosimetric system. Also, ACR phantom was used to analyze image quality at 128 channel multi-detector CT (scan parameters: 320 mAs at 120 kVp, collimation: 128 × 0.6 mm, scan range :137 mm, reconstructed slice thickness 0.6 mm, increment 0.4 mm). Heart beat rate of phantom was maintained 60 bpm in ECG gating. In a retrospectively ECG gated helical scan mode was done with 280 msecgantry rotation time, 0.23 pitch. Peak dose was used without cardiac dose modulation (pulsing off mode). Peak dose was adopted in range of 60%~80% of R-R interval and 25% reduction in others with cardiac dose modulation (pulsing manual mode). And peak dose was adopted in range of 60%~80% of R-R interval and 4% reduction in others with cardiac dose modulation (pulsing MinDose-manual mode). In a prospectively ECG gated sequential scan mode data were acquired at 70% R-R interval (middle diastolic phase in cardiac cycle), and 170 msec gantry rotation time was used. In a prospectively ECG gated high-pitch cardiac scan mode data were acquired from 60% R-R interval, and 3.4 pitch was used. Analysis of image quality was clone by evaluating objective noise, uniformity, high contrast resolution, and linearity. Results The mean effective dose for pulsing off mode without cardiac dose modulation in a retrospectively ECG gated helical scan was 20.8 mSv, and die mean organ dose of heart was 116.7 mGy. Pulsing manual mode showed 49% reduction, compared with that of pulsing off mode. And pulsing MinDose-manual mode showed 60% reduction compared with that of pulsing off mode. And at die adaptive sequential scan mode under prospective ECG gating die mean effective dose was 2.7 mSv, and die mean organ dose of heart was 17.5 mGy, d1is represents an 86% reduction compared with that of pulsing off mode. In the high pitch cardiac scan under prospective ECG gating die mean effective dose was 1.8 mSv, and the mean organ dose of heart was 10.3 mGy, this represents an 91% reduction compared with that of pulsing off mode. No differences in quantitative measures of linage quality were found between high pitch cardiac scan mode and others for noise, uniformity, high contrast resolution, linearity. Conclusion In patients with a low and stable heart rate, prospectively ECG gated high-pitch cardiac scan provides excellent image quality equivalent to retrospectively ECG gated helical scan-corelated acquisition but reduced effective dose.

수도권 경사주거지의 분포 현황과 생활환경 특성 분석 : - 경사도 유형을 중심으로 -

이대일(Lee, Dae Il),장한두(Jang, Han Doo) 대한부동산학회 2020 大韓不動産學會誌 Vol.38 No.1

본 연구는 수도권에 위치한 경사주거지의 주거환경 개선을 위해 현황과 문제를 파악하는데 목적을 두었으며 주택 수요와 개발 압력이 상대적으로 높은 서울, 경기, 인천 지역의 28개 경사지를 선정후, GIS분석과 설문조사를 실시하고 경사도 수준에 따라 4개 유형을 구분한 후 유형별 특성 분석을 통해 경사도 수준별 생활환경의 차이와 문제를 파악하고자 하였다. 수도권 경사주거지의 분포 현황을 GIS 분석을 통해 전용 및 일반주거지역의 경사지 개별필지를 경사를 기준으로 구분하여 분포 비율을 파악하고, 경사 유형별로 필지의 규모, 주택유형, 인접도로폭 등의 현황 분석을 하였다. 설문조사는 경사지 845부, 인접평지 175부, 총1,020필지를 2013년에 개별방문 방식으로 조사하였으며, 주민이 주거환경을 평가한 88개 항목을 요인분석을 통해 16개 요인으로 압축하여 설명변수로 하고 주거만족도를 종속변수로하는 회귀분석을 실시하여 경사 유형별로 주거만족 영향요인을 비교분석하였다. The purpose of this study was to investigate the distribution status and the factors influencing residential satisfaction in hillside residences of Metropolitan areas in Korea. A cross-sectional survey with face-to-face interviews and Geographic Information System (GIS) were used and the data were collected in from March to April 2013. Participants were total 1,020 residents who were 845 residences representing 28 hillside areas, and 175 residences representing neighboring flat areas in metropolitan areas, such as Seoul, Incheon, and Gyeonggi-do. The slope type was based on the slope level of the individual parcels of participants’ by using GIS analysis. Collected data were analyzed with descriptive tatistics, factor analysis, and multiple regression using the SPSS Win program. This study showed significant factors influencing residential satisfaction and dis-satisfaction, according to the slope types. These results could be used as useful evidences for improving the residential satisfaction of Hillside Residences in Korea.