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정구인(Gu-In Jung),김지선(Ji-Sun Kim),유환동(Hwan-Dong Yu),이태희(Tae-Hee Lee),우창민(Chang-Min Woo),이영재(Young-Jae Lee),이정환(Jeong-Whan Lee),전재훈(Jae-Hoon Jun) 대한전기학회 2010 정보 및 제어 심포지엄 논문집 Vol.2010 No.10
관절의 움직임을 정확히 측정하는 것은 의료적으로 질병의 진단 및 장애정도를 판단하는 기준, 재활치료 측면에서 매우 중요한 역할을 할뿐 아니라 스포츠 분야에서 동작학습 및 컨디션 조절에 있어 매우 중요하다. 기존에 일반적으로 사용되는 의료용 측각도계는 정확한 축 제시가 힘들고, 반복사용에 따른 기계적 마모로 인한 내구성의 문제, 측정자의 주관성 등의 단점이 존재한다. 이를 개선하기 위해 본 연구에서는 관절의 각 변위를 측정하기 위해 종단 경사 광섬유를 사용하여 빛의 비대칭적 특성을 이용하였다. 실험 결과 종단이 평평한 광섬유에 비해 종단 경사 광섬유를 사용하였을 때 측정 범위가 향상되었고, 이를 이용하여 각 변위 센서의 새로운 모델의 적용 가능성을 제시하고자 한다.
정구복 ( Jeong Gu Bog ),김원일 ( Kim Won Il ),이종식 ( Lee Jong Sig ),신중두 ( Sin Jung Du ),김진호 ( Kim Jin Ho ),윤순강 ( Yun Sun Gang ) 한국환경농학회 2004 한국환경농학회지 Vol.23 No.1
Objectives of this study were to monitor the distribution of heavy metals, to compare extractable heavy metal with total content and to investigate the relationships between soil physico-chemical properties and heavy metals in orchard soil. sampling sites were 48 in Gyeonggi, 36 in Gangwon, 36 in Chungbuk, and 44 in Chungnam. Soils were collected form two depths, 0 to 20 and 20 to 40 cm (here after referred to as upper and lower layers) from March to May in 1998. Total contents of heavy metal in soils were analyzed by ICP-OES after acid digestion (HNO₃:HCl:H₂O₂) whereas extractable contents were measured after successive extraction of 0.1 N-HCl, 0.05 M-EDTA, and 0.005 M-DTPA. Mercury was analysed by mercury atomizer. The average contents of Cd, Cu, and Pb in the extractant with 0.1 N-HCl at upper layer were 0.080, 4.23, and 3.42 ㎎/㎏, respectively. As content in the extractant with 1 N-HCl was 0.44 ㎎/㎏, and total contents of 20, Ni, and Hg were 78.9, 16.1, and 0.052 ㎎/㎏, respectively. m e ratios of concentrations of heavy metals to threshold values (Cd 1.5, Cu 50, Pb 100, Zn 300, Ni 40, Hg 4 ㎎/㎏) in soil Environmental Conservation Act in Korea (2001) were low in the range of 1/2.5-1/76.9 in orchard soils. The ratios of extractable heavy metal to total content ranged 5.4-9.21% for Cd, 27.9-47.8% for Cu, 12.6-21.8% for Pb, 15.8-203% for Zn, 5.3 -6.3% for Nii and 0.7 -3.6% for 2n, respectively. Cu and Pb contents in 0.05 M-EDTA extractable solution were higher than those in the other extractable solution. Total contents of Cd, Ni, and Ni in soils were negatively correlated with sand content, but positively correlated with silt and clay contents. Ratios of extractable heavy metal to total content were negatively correlated with clay content, but Zn and Ni contents were positively correlated with soil pH, organic matter, and available phosphorous. Therefore, the orchard soil was safe because the heavy metal contents of orchard soil were very low as compared to its threshold value in the Soil Environmental Conservation. Act However, it need to consider the input of agricultural materials to the agricultural land for farming practices for assessment of heavy metals.
정구인(Gu-in Jung),김지선(Ji-Sun Kim),허동훈(Dong-Hun Hur),유환동(Hwan-Dong Yu),임성환(Sung-Hwan Lim),최주현(Ju-Hyeon Choi),이정환(Jeong-Hwan Lee),엄광문(Gwang-Moon Eom),전재훈(Jae-Hoon Jun) 대한전기학회 2011 전기학회논문지 Vol.60 No.10
Measuring the movement of joint angle of human body is very important clinically. Human joint angle displacement can be used to evaluate the degree of disease and disability. Also, we can determine the rehabilitation process with angular information. Conventional methods for measuring angular displacement are many weakness. The purpose of this study is to overcome the limitations of existing equipments by using optical method. For this reason, optical sensor system was used to correlate detected light signal with joint angle. Experimental results of the applied joint model in this study showed that joint angular displacement can be measured by optical signals. The suggested method is simple, durable, small, lightweight, convenient, and cost effective.
도심항공교통시스템 운용 개념 분석에 따른 운항경로 구축 연구
이영재(Youngjae Lee),곽태호(Tae Ho Kwag),정구문(Gu Moon Jeong),안재현(Jae Hyun Ahn),정봉철(Bong Cheul Chung),이재우(Jae-Woo Lee) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.12
인공지능, 자율항법 등 4차 산업의 기술들이 발전하면서 도심항공교통(UAM)이 도심의 교통 체증에 대한 효과적인 대안으로 고려되고 있으며, 한국을 비롯한 세계의 많은 기업들이 비행체 개발과 운용 체계 연구를 수행하고 있다. 본 연구에서는 도심항공교통의 운용에 필요한 요소들을 식별, 분류한 뒤 운용 체계 개념을 수립하였으며, 각 요소별로 세부적 고려사항들을 분석하였다. 운용 체계 개념 분석 결과를 기반으로 서울시와 경인권을 연결하는 도심항공교통 운항경로를 구축하였으며, 비행체의 성능 분석을 통하여 구축된 운항경로가 운용이 가능함을 확인하였다. 본 경로 분석연구는 추후 국내 여러 도시의 도심항공교통 운항경로 수립에 적용이 가능할 것으로 예측된다. With the advent of industry 4.0 technologies like the artificial intelligence and the autonomous flight, Urban Air Mobility (UAM) is being considered as an effective alternative to resolve the ground urban traffic congestion. Accordingly, many companies in the world including Korea are investigating on the development of UAM vehicles and operation systems. In this study, after identifying and classifying the essential elements of the UAM operation, the UAM system operational concept has been derived, then detailed analyses for each element has been performed. Based on the conceptual analysis of the UAM operation system, UAM flight routes in Seoul and Gyeong-In area have been established and confirmed to be operable through the performance analysis of UAM vehicles. The flight route analysis in this study is expected to be applied to UAM flight routes establishment in various cities in the future.