일부 농업인에서 자기 기입식 농약 노출 설문에 대한 신뢰도 연구

이요한,차은실,문은경,공경애,고상백,이윤근,이원진,Lee, Yo-Han,Cha, Eun-Shil,Moon, Eun-Kyeong,Kong, Kyoung-Ae,Koh, Sang-Baek,Lee, Yun-Keun,Lee, Won-Jin 대한예방의학회 2010 Journal of Preventive Medicine and Public Health Vol.43 No.6

Objectives: Exposure assessment is a major challenge faced by studies that evaluate the association between pesticide exposure and adverse health outcomes. The objective of this study was to investigate the reliability of information that farmers self-report regarding their pesticide use. Methods: Twenty five items based upon existing questionnaires were designed to focus on pesticide exposure. In 2009, a selfadministrated survey was conducted on two occasions four weeks apart among 205 farmers residing in Gyeonggi and Gangwon provinces. For a reliability measure, we calculated the percentage agreement, the kappa statistics and the intraclass correlation coefficient (ICC) between the two reports according to the characteristics of the subjects. Results: Agreement for ever-never use of any pesticide was 96.4% (kappa 0.61). For both 'years used' and 'age at the first use' of overall pesticides, high agreement was obtained (ICC: 0.88 and, 0.78, respectively), whereas those of 'days used' and 'hours used' were relatively low (ICC: 0.42 and, 0.66, respectively). The kappa value for the use of personal protective equipment ranged from 0.46 to 0.59, and hygiene activities came out at 0.19 to 0.37. The agreement for individual pesticide use ranged widely and there was relatively low agreement due to the low response rates. The reliability scores did not significantly vary according to gender, age, the education level, the types of crop or the years of farming. Conclusions: Our results support that carefully designed, self-reported information on ever-never pesticide use among farmers is reliable. However, the reliability of data on individual pesticide exposure may be unstable due to low response rates and needs to be refined.

지역 분할과 다중 라이트 빔을 이용한 3차원 얼굴 형상 모델링 기법

이요한,조주현,송태경,Lee, Yo-Han,Cho, Joo-Hyun,Song, Tai-Kyong 대한전자공학회 2001 電子工學會論文誌-CI (Computer and Information) Vol.38 No.6

본 논문에서는 한 개의 카메라와 한 대의 환등기(LCD 환등기 혹은 슬라이드 환등기)를 이용하여 2차원 얼굴 영상으로부터 3차원 얼굴 형상을 모델링하는 방법을 제안한다. 환등기를 이용하여 사람 얼굴에 라이트 빔을 투영하고 이를 조금씩 이동시키며 영상을 획득한 뒤 각 2차원 영상의 지역적 정보와 영상들 사이의 시간적 정보를 함께 이용하여 3차원 형상을 복원하는 방법을 채택하였다. 제안된 방법에서는 특정이 서로 다른 영역들의 효과적인 3차원 좌표 모델링을 위해 영상을 그림자 부분 얼굴 부분 그리고 머리카락 부분으로 나누어 처리하는 지역 분할(region segmentation) 기법을 도입하였고, 2차원 얼굴 영상 획득 시간을 줄이고 고속 3차원 스캔을 위하여 한 영상 안에 다수의 라이트 빔(multiple light beams)을 이용하였다. 또 한 라이트 빔의 경계를 정확하게 검출하기 위하여 라이트 빔 캘리브레이션(light beam calibration) 기법을 제안하여 사용하였다. 실험 결과 제안한 방법을 통해서 머리카락 부분을 포함한 전체 얼굴 영역에서 향상된 3차원 모델링 결과를 얻을 수 있었다. This paper presents a 3D face modeling method using a CCD camera and a projector (LCD projector or Slide projector). The camera faces the human face and the projector casts white stripe patterns on the human face. The 3D shape of the face is extracted from spatial and temporal locations of the white stripe patterns on a series of image frames. The proposed method employs region segmentation and multi-beam techniques for efficient 3D modeling of hair region and faster 3D scanning respectively. In the proposed method, each image is segmented into face, hair, and shadow regions, which are independently processed to obtain the optimum results for each region. The multi-beam method, which uses a number of equally spaced stripe patterns, reduces the total number of image frames and consequently the overall data acquisition time. Light beam calibration is adopted for efficient light plane measurement, which is not influenced by the direction (vertical or horizontal) of the stripe patterns. Experimental results show that the proposed method provides a favorable 3D face modeling results, including the hair region.

메탄-연소배가스 치환 과정의 해리엔탈피 측정

이요한(Yohan Lee),김연주(Yunju Kim),이승민(Seungmin Lee),이재형(Jaehyung Lee),서용원(Yongwon Seo) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.11

메탄 - 연소 배가스 치환공정에서 혼합 가스 하이드레이트의 해리열 측정 및 구조분석

이요한(Yohan Lee),김연주(Yunju kim),이승민(Seungmin Lee),이재형(Jaehyung Lee),서용원(Yongwon Seo) 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05

Measurement of Dissociation Enthalpy for Gas Hydrates Using in-situ High pressure DSC

Seungmin Lee(이승민),Jin Woo Lee(이진우),Kyeong Nam Park(박경남),Sang Yeon Hong(홍상연),Yunju Kim(김연주),Yohan Lee(이요한),Ju Dong Lee(이주동),Yongwon Seo(서용원) 한국신재생에너지학회 2013 한국신재생에너지학회 학술대회논문집 Vol.2013 No.05

Methane+Isoprophylamine 하이드레이트의 상평형 및 분광학적 분석

이승민(Seungmin Lee),이진우(Jinwoo Lee),김연주(Yunju Kim),이요한(Yohan Lee),이주동(Ju Dong Lee),서용원(Yongwon Seo) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.11

열전달 촉진 표면에서 R1234yf의 풀 비등 열전달계수

이요한(Yohan Lee),강동규(Dong Gyu Kang),서훈(Hoon Seo),정동수(Dongsoo Jung) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.3

In this work, nucleate pool boiling heat transfer coefficients (HTCs) of R134a and R1234yf are measured, on flat plain, 26 fpi low fin, Turbo-B, Turbo-C and Thermoexcel-E surfaces. All data are taken at the liquid pool temperature of 7℃, on a small square copper plate (9.53 ㎜×9.53 ㎜), at heat fluxes from 10 ㎾/㎡ to 200 kW/㎡, with an interval of 10 ㎾/㎡. Test results show that nucleate boiling HTCs of all enhanced surfaces are greatly improved, as compared to that of a plain surface. Nucleate pool boiling HTCs of R1234yf are very similar to those of R134a, for the five surfaces tested.

Low-fin 촉진 표면에서 임계 열유속까지의 분무 냉각 열전달 특성

이요한(Yohan Lee),강동규(Dong-Gyu Kang),정동수(Dongsoo Jung) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.9

Spray cooling is a technology of increasing interest for electronic cooling and other high heat flux applications. In this study, heat transfer coefficients (HTCs) and critical heat fluxes (CHFs) were measured on a smooth square flat copper heater of 9.53×9.53 mm at 36℃ in a pool, with a smooth flat surface, and 26 fpi. Low-fin surfaces were used to see the change in HTCs and CHFs according to the surface characteristics, and FC-72 was used as the working fluid. FC-72 fluid had a significant influence on the heat transfer characteristics of the spray over the cooling surface. HTCs were taken from 10 kW/㎡ to critical heat flux, for all surfaces. Test results with Low-fin showed that the CHFs of all the enhanced surface were greatly improved. It can be said that the surface form affects the heat transfer coefficient and critical heat flux.

예산 지역의 장소성(場所性) 변천에 관한 일고찰

이요한(Lee, Yo Han) 경인교육대학교 기전문화연구소 2020 기전문화연구 Vol.41 No.2

장소성의 의미는 ‘한 장소에서 드러나는 특별한 성격’으로, 이는 물리적 위치인 공간(空間)에서 생활하는 사람들의 경험이 시간의 흐름에 따라 축적되면서 생성되는 특성이라 풀이할 수 있다. 장소성은 일정 공간의 자연환경이동일하게 유지되더라도 역사적 사건의 여파에 따라 변천을 겪으며, 지역 대내외적으로 순환되면서 강화되는 측면을 띠고 있다. 본고의 연구지역인 예산 지역은, 현재 대중적으로 인지도가 가장 높은 남연군묘 도굴사건을 바탕으로 그 장소성이 부각되는 면이 있다. 그러나 특정지역의 단편적인 사건 강조는 그 지역에 관한 전반적 인식의 폭을 제한하는단점이 있다. 주지하다시피 역사적 사건은 우발적으로 일어나기보다 일련의지리적·문화적 맥락에서 파생될 확률이 높기 때문이다. 이러한 측면에서 예산군의 장소성은 남연군묘가 대내외적으로 부각되고있으나 그와 관련된 지리적 배경과 역사적 맥락을 이해하는 것이 선행되어야한다고 본다. 이에 본고에서는 조선 후기 예산군에 관한 장소성 인식과 그 변천과정을 분석하기 위해 예산군의 인문지리학적 배경을 검토한 후, 기존 연구를 바탕으로 조선 후기의 발생한 연속적 사건과 그 영향을 살펴보았다. 분석 결과, 예산군은 서해안으로 연결되는 관내의 하천을 중심으로 해양문화와 내륙문화가 상호작용하며 발달한 문화적 배경을 띠고 있었다. 장소성의변천 측면에서 예산 지역은 고려시대부터 조선전기까지는 조운의 주요 경로로 인식되다가 조선 후기에 이르러 저명한 지리학자 이중환에 의해 국내 유수의 가거지(可居地)로 알려진 후, 천주교가 전파 전파된 후 부터는, 지속적인 조선 정부의 박해로 인해 극심한 천주교 박해지로 대두된다. 오페르트의남연군묘 도굴사건은 예산 지역의 인문지리적 환경과 이러한 장소성 변천을따라 설명되어야 하며 현재 남연군묘를 강조하려는 해당 지자체의 노력 또한오페르트 도굴사건이 일어난 제반 배경에 대한 이해를 기반으로 진행되어야한다고 생각된다. The dictionary meaning of ‘sense of place’ is a special personality revealed in one place . This can be interpreted as a characteristic that is created as the experiences of people living in a space, which is a physical location, accumulate over time. Even if the natural environment of a certain space remains the same, it undergoes changes according to the aftermath of historical events, and is reinforced as it circulates inside and outside the region. The Yesan area, which is the study area of this paper, is based on the case of the robbery of Namyeon gun grave which is currently the most popularly recognized, and has a side that highlights its location. As is well known, historical events are more likely to derive from a series of geographic and cultural contexts rather than accidentally. In this respect, it is necessary to understand the geographical background and historical context related to it. In this paper, in order to analyze the recognition of the place and the transition process of Yesan-gun in the late Joseon Dynasty, after reviewing the humanities and geographic background of Yesan-gun, based on previous studies, the historical events of the late Joseon Dynasty and their effects were examined. As a result of the analysis, Yesan-gun had a cultural background that developed through the interaction between marine and inland cultures, centering on the rivers in the hall that connect to the west coast. In terms of location, the Yesan area was recognized as the main route of Joun, but in the late Joseon Dynasty, it was known as one of the leading geologists in Korea by renowned geographer Lee Jung-hwan. However, after Catholicism was spread throughout Naepo, including the Yesan area, the persecution of the Joseon government continued, and it transformed into the most severe persecution of Catholicism in the country. Opert s pilgrimage case should be understood in accordance with the geographic environment of the Yesan area and this historical context and the local government s efforts to highlight the current Namyeon-gun mausoleum are also considered to have added meaning when describing the relevant area in accordance with the historical context

1970년대 새마을운동이 산림녹화에 미친 영향 분석

이요한(Yo han Lee),장재봉(Jae Bong Chang) 한국농업정책학회, 한국축산경영학회 2017 농업경영정책연구 Vol.44 No.1

This study investigates how Saemaul Undong in 1970s contributed to the successful forest rehabilitation of South Korea. Based on the theoretical model explaining the relationship between deforestation and income, we conduct an empirical analysis on the driving factors of successful afforestation in South Korea, using the panel data from 1967 to 1979. Results show that afforestation with people’s participation, massive plantation for chestnut production, construction of agriculture roads for income improvement among Saemaul Undong programs had significant impacts on the success of forest rehabilitation in South Korea. In particular, the increase of farm income contributes to converting the main energy source of farm households from fuelwood to fossil-fuel. In addition, strong leadership and people’s participation made synergetic impacts on other Saemaul programs, which resulted in the achievement of national afforestation plan in a short time. This study provides important lessons that implies income improvement is a necessary condition for developing countries to resolve their deforestation problem.