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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.
이요한(Lee, Yo-Ha),강동규(Kang, Dong-Gyu),최현주(CHOI, Hyun-Joo),정동수(Jung, Dong-So) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.1
In this study, thermodynamic performance of R435A is examined both numerically and experimentally in an effort to replace HFC 134a used in the refrigeration system of domestic water purifiers. Even though HFC134a is used predominantly in such a system these days, it needs to be phased out in the near future in Europe and most of the developed countries due to its high global warming potential. To solve this problem, cycle simulation and experimental measurements are carried out with a new refrigerant mixture of 20%R152a/80%RE170 using actual domestic water purifiers. This mixture is numbered and listed as R435A by ASHRAE recently. Test results show that the system performance with R435A is greatly influenced by the amount of charge due to the small internal volume of the refrigeration system of the domestic water purifiers. With the optimum amount of charge of 21 to 22 grams, about 50% of HFC134a, the energy consumption of R435A is 11.8% lower than that of HFC134a. The compressor discharge temperature of R435A 8℃ lower than that of HFC134a at the optimum charge. Overall, R435A, a new long term environmentally safe refrigerant, is a good alternative for HFC134a requiring little change in the refrigeration system of the domestic water purifiers.
◇ 5분과 : 성장회계분석을 통한 임산업의 성장요인분석과 전망
이요한 ( Yo Han Lee ),정재호 ( Jae Ho Jung ),민경택 ( Kyung Taek Min ) 한국임학회 2015 한국산림과학회지 Vol.104 No.4
이 연구에서는 과거 임산업의 성장과정을 분석하고 임산업의 성장회계분석을 통하여 투입요소별 성장기여도를 분해한 후 향후 임산업의 잠재 성장률을 전망하였다. 이 연구에서 나타난 임산업의 성장요인 분석결과를 토대로 궁극적으로는 임산업의 지속적인 성장을 위한 방향을 제시하였다. 외환위기 이후 경제의 빠른 회복과 함께 우리나라 임산업은 2000년 이후 성장률이 안정되었다. 그러나 과거 임산업은 노동과 자본의 투입에 기초한 성장을 하였다면, 2000년 이후에는 임산업의 성장은 자본 투입의 증가에 의해 주도되었다. 성장회계분석을 통해 잠재 성장률을 추정한 결과, 2012년부터 2020년의 기간 동안 임산업 생산액 평균성장률은 1.65%이며, 이에 대한 노동과 자본, 총요소생산성의 기여도는 각각 0.08%, 1.58%, -0.01%로 나타났다. 또한 이러한 성장 추세를 따른다고 가정한다면 2020년 임산업 총생산액은 약 36.25조 원에 이를 것으로 기대된다. This study analyzed a long-run growth trend of the forestry sector in the Republic of Korea, and forecasted the potential growth in the future after investigating main drivers of growth in the forestry sector through growth accounting analysis. Based on results, we finally suggested a direction to go forward in order to achieve a sustainable growth in the field. After Asia financial crisis, the growth rate of the forestry sector was getting stable with the fast recovery of Korean economy. While the main drivers of growth in the field was labor and capital accumulation in 1980s and 1990s, the main driver of growth has been the increment of capital accumulation since 2000. As the result of our analysis for forecasting the potential growth in the field, the contribution of labor, capital, TFP in total growth is expected as 0.09%, 1.58%, and -0.01%, respectively. The potential growth rate of the forestry sector during 2012-2020 is predicted to be 1.65% and the total production will become 36.25 trillion won.