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황정환,전흥석,Hwang, Jung-Hwan,Jeon, Heung-Seok 한국정보처리학회 2011 정보처리학회논문지 A Vol.18 No.2
최근 청소로봇을 위한 여러 가지 알고리즘들이 개발되면서 다양한 청소로봇들이 개발되고 있다. 그 중 청소로봇이 청소하는데 있어 청소시간의 제약이 있을 경우 효율적으로 청소할 수 있는 알고리즘인 DmaxCoverage 알고리즘이 있는데 이 알고리즘을 구현하는데 장애물이 존재하지 않는 비어있는 공간을 찾기 위해 Rectangle Tiling기법을 사용하고 있다. Map을 그리드 형태의 수많은 사각형으로 나타낼 경우 사각형을 찾는 기법 중 수학적 방법으로 Rectangle Tiling이 최적의 값을 찾아줄 수 있다. Rectangle Tiling 기법은 그리드 형식의 map에서 생성될 수 있는 사각형들의 모든 경우의 수를 찾는 것이다. 이때 그리드선의 간격이 촘촘하고 map의 크기가 클 경우 많은 사각형이 생성됨으로 많은 시간을 소모해야 하는 문제점이 있다. 본 논문에서는 Rectangle Tiling에 근접한 정확성과 보다 개선된 속도를 제공하는 Four Direction Rectangle Scanning(FDRS)기법을 제안한다. FDRS기법은 존재하는 모든 사각형을 찾는 것이 아니라 물체가 존재하는 셀의 상하좌우만을 검색하여 빈 공간을 찾는 기법이다. 이 두 알고리즘을 비교하여 FDRS의 효율이 뛰어남을 실험을 통해 보여준다. Recently, many cleaning robots have been made with various algorithms for efficient cleaning. One of them is a DmaxCoverage algorithm which efficiently clean for the situation when the robot has a time limit. This algorithm uses Rectangle Tiling method for finding the biggest rectangle that doesn't have any obstacle. When the robot uses grid map, Rectangle Tiling method can find the optimal value. Rectangle Tiling method is to find all of the rectangles in the grid map. But when the grid map is big, it has a problem that spends a lot of times because of the large numbers of rectangles. In this paper, we propose Four Direction Rectangle Scanning(FDRS) method that has similar accuracy but faster than Rectangle Tiling method. FDRS method is not to find all of the rectangle, but to search the obstacle's all directions. We will show the FDRS method's performance by comparing of FDRS and Rectangle Tiling methods.
영상처리기술과 안드로이드를 이용한 축산물 원산지 판별 어플리케이션에 관한 연구
황정환(Jung Hwan Hwang),박창선(Chang Seon Park),문형만(Hyung Man Moon),김병주(Byung Ju Kim),서정민(Jung Min Seo) 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.2
국내 유통되고 있는 쇠고기는 대부분 한우육과 젖소육, 그리고 수입육인데 소비자들의 한우육 선호로 인해 젖소육 이나 수입육이 한우육 으로 둔갑 판매되는 경우가 종종 있다. 또한 미국산 쇠고기 수입 개방과 더불어 원산지표시제 시행에 따라 한우와 수입쇠고기의 감별에 대한 요구가 높아졌다. 이에 따라 한우와 젖소고기 감별기술의 다양한 연구가 진행되어 왔으며 한우 특이 마커의 개발 등 현재에도 다양한 연구가 진행 중에 있으나 특정 개체에 한정되어 있을 뿐 아니라 대중화되기 까지 상당한 시간과 노력이 소요 될 것으로 판단된다. 본 논문에서는 이미지 처리 기술과 안드로이드를 이용하여 축산물의 원산지 정보를 제공하는 어플리케이션을 제안 하였다. 소비자에게 친숙한 모바일 기기를 통해 국내에서 유통되는 축산물에 관한 신뢰도를 향상시킴으로서 유통의 촉진을 향상 시킬 수 있을 것이다.
이정수(Jung-Soo Lee),백기엽(Kee-Yoeup Paek),신영안(Young-An Shin),박수형(Su-Hyung Park),정석태(Seok-Tae Jeong),황정환(Jeong-Hwan Hwang) 한국원예학회 2004 원예과학기술지 Vol.22 No.1
There is a high demand for oriental melons during summer (May to July). At this time of year, the soil is waterlogged due to monsoon in Korea. Plant responses to soil waterlogging was investigated in this experiment. The soil was waterlogged for 1, 3 and 5 days during the early vegetative, and late fruit stages. After waterlogging, O₂ concentration in soil decreased rapidly and CO₂ concentration increased rapidly. Root viability and leaf net photosynthesis decreased and leaf resistance decreased as waterlogging duration extended. With waterlogging, leaves turned yellow more rapidly in mature leaves than young leaves. Leaf ethylene production increased with extending waterlogging duration, but then decreased rapidly after waterlogging. The ethylene production in fruits, especially in mature fruits decreased as waterlogging duration increased. The reduction of sugar concentration in fruit was inversely related to waterlogging duration. Extension of waterlogging duration at any plant's developmental stage decreased the number and weight of marketable fruit and their soluble solids content. Roots of waterlogged plants were thinner and more branched than those of control plants.
송석환 ( Suck Hwan Song ),황정환 ( Jung Hwan Hwang ),황범구 ( Byum Goo Hwang ),김현욱 ( Hyun Wook Kim ) 한국산업위생학회 2008 한국산업보건학회지 Vol.18 No.4
This study is to characterize the occurrence types and mineralogical characteristics of asbestos for the Kwangcheon areas, Chungnam. The mine areas had been exploited as asbestos mines for several decades since 1930. Host rocks of the asbestos are serpentinites and altered rocks of the ultramafic rocks. Representative samples of the host rocks and minerals were sampled and were examined with microscopes. To confirm for the existences and compositions of the asbestos, the rock samples were analysed with EPMA, XRD and EDS. Chrysotile, tremolite and actinolite were found as asbestos and non-asbestos forms in these areas. Chrysotiles, as non-asbestos forms, occur in the host rocks with mesh and hourglass textures. They, as asbestos forms, are mainly found as the veins. The tremolite and actinolite, as asbestos types, occur as alteration products of the olivine and pyroxene within the host rocks. They, as asbestos types, are also found following the cracks and fractures. Overall results suggest that three types of the asbestos are found in the Kwangcheon and Kaewol mine areas. Based on the occurrence types for the asbestos, additional studies are required for the asbestos in the top soil and air.
ICT기반 인터랙티브 아트 STEAM프로그램 개발: 고등학교중심
김형숙 ( Hyung Sook Kim ),황정환 ( Jung Hwan Hwang ) 한국무용과학회 2015 한국무용과학회지 Vol.32 No.2
본 연구의 목적은 인터랙티브 아트 활동을 통하여 학생들이 과학·기술 기반 지식을 재미있고 다양하게 학습할 수 있는 STEAM 프로그램을 개발하는데 있다. 이를 위하여 고등학교 1학년 과학 교과서 중심으로 내용을 분석하고, 통합예술활동과 키넥트 활동 등으로 과학기반 지식의 이해를 확장하고 이를 사회적 관심사와 연계하여 학생들이 쉽게 이해할 수 있도록 구성하였다. 주제에 따라 상황제시, 창의적 설계, 감성적 체험의 STEAM 준거틀에 따라 전체 10차시로 구성하고 상황제시는 각 차시의 주제에 관심을 갖고 이해를 돕기 위한 애니메이션, 사진, 동영상 등의 자료를 제시하였다. 창의적 설계는 교사가 주제에 따른 내용을 통합예술과 키넥트 등을 선택하여 활용할 수 있도록 구성하고, 감성적 체험은 학습내용을 공유할 수 있도록 발표, 패션쇼, 전시회, 인터랙티브 아트 등으로 구성하였다. 인터랙티브 아트를 활용한 STEAM 프로그램을 통하여 향후 다양한 사회문제해결형 프로그램을 개발하여 제공할 수 있을 것으로 판단된다. The aim of this study is to develop STEAM program through interactive art activities so that students can study science and technology-based knowledge with having fun. For this, a science textbook of the first grade of high school was mainly analyzed and this study focused on integration art activities and Kinect activity to expand the knowledge. We constituted 10 times of classes by topics such as presenting situations, creative design, and emotional touch according to the STEAM standards. Presenting situations provide animations, pictures and video clips to help understanding about the topics. An instructor can choose appropriate integrated art activities or Kinect in each topic in the creative design. Lastly the emotional touch is constituted by presentations, fashion show, exhibition, interactive arts and so on. It is considered that a variety of social problem solving programs can be developed through the STEAM program utilizing the interactive arts.
임상 실습 중인 의과대학생들의 혈액 및 체액에 노출 정도
이창섭 ( Chang Seop Lee ),황정환 ( Jeong Hwan Hwang ),선수연 ( Su Yeon Seon ),정민희 ( Min Hee Jung ),박진희 ( Jin Hee Park ),이흥범 ( Heung Bum Lee ) 대한내과학회 2008 대한내과학회지 Vol.74 No.5
Background/Aims: Medical students face the threat of acquiring blood-borne infections such as HIV, Hepatitis B and Hepatitis C during their clinical activities in clerkship. This study determined the frequency of exposure and the risks of exposure to blood and body fluids among medical students. Methods: An anonymous questionnaire was administrated to the 4th year medical students in a tertiary academy university hospital. Results: The surveys were completed by 124 students (100% of the students). Seventy-one percent (88 cases) reported more than one time of exposure to blood or body fluids during the consecutive 2 years of clinical rotation. Single needle stick injury occurred for 19.3% of the students, both exposure to needle stick and splash occurred for 40.9% and single splash occurred for 39.8% of the 88 cases. Venipucture was the highest exposure event (50%), and the other causes were scrub (35.2%), bedside procedures (35.2%), arterial puncture (22.7%), lancet (13.6%), suture (5.7%) and others (8%). The emergency department had the highest exposures rate (80.7%), and this was followed by general surgery (33%), neurosurgery (8%), orthopedic surgery (8%), plastic surgery (6.8%), obstetrics-gynecology (5.7%) and others (10.1%). The major exposure sites in the hospital were the emergency room (81.8%), operation room (38.6%), intensive care unit (8%), general ward (6.8%) and others (2.3%). Only nineteen cases (21.6%) of hospital exposure were reported to the appropriate medical personnel. Conclusions: This study shows medical students have the potential risk of health care related infection when they are exposed to many patients in the emergency department without a supervisor being present. To avoid the occurrence of these problems, preventive education, and particularly the practice of universal precaution, should be taken by the medical students before beginning their clinical activity.(Korean J Med 74:500-505, 2008)