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RISS 인기검색어
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- 저자 : 김종수 ( Jongsu Kim ) (검색결과 86 건)
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휘발성 유기 화합물 및 암모니아 직접 연소를 통한 배기가스 특성
김종수,최석천,정수화,목진성,김두범,Kim, JongSu,Choi, SeukCheun,Jeong, SooHwa,Mock, ChinSung,Kim, DooBoem 한국청정기술학회 2022 청정기술 Vol.28 No.2
The semiconductor process currently emits various by-products and unused gases. Emissions containing pollutants are generally classified into categories such as organic, acid, alkali, thermal, and cabinet exhaust. They are discharged after treatment in an atmospheric prevention facility suitable for each exhaust type. The main components of organic exhaust are volatile organic compounds (VOC), which is a generic term for oxygen-containing hydrocarbons, sulfur-containing hydrocarbons, and volatile hydrocarbons, while the main components of alkali exhaust include ammonia and tetramethylammonium hydroxide. The purpose of this study was to determine the combustion characteristics and analyze the NO<sub>X</sub> reduction rate by maintaining a direct combustion and temperature to process organic and alkaline exhaust gases simultaneously. Acetone, isopropyl alcohol (IPA), and propylene glycol methyl ether acetate (PGMEA) were used as VOCs and ammonia was used as an alkali exhaust material. Independent and VOC-ammonia mixture combustion tests were conducted for each material. The combustion tests for the VOCs confirmed that complete combustion occurred at an equivalence ratio of 1.4. In the ammonia combustion test, the NO<sub>X</sub> concentration decreased at a lower equivalence ratio. In the co-combustion of VOC and ammonia, NO was dominant in the NO<sub>X</sub> emission while NO<sub>2</sub> was detected at approximately 10 ppm. Overall, the concentration of nitrogen oxide decreased due to the activation of the oxidation reaction as the reaction temperature increased. On the other hand, the concentration of carbon dioxide increased. Flameless combustion with an electric heat source achieved successful combustion of VOC and ammonia. This technology is expected to have advantages in cost and compactness compared to existing organic and alkaline treatment systems applied separately.
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김종수,이재홍,권현범,Kim, Jongsu,Lee, Jaehong,Kwon, Hyeonbeom 충북대학교 교육개발연구소 2018 한국교육논총 Vol.38 No.3
본 연구의 목적은 중등학교 스마트교육의 효과성을 분석하는데 있다. 이를 달성하기 위하여, 스마트교육 개념을 적용한 고등학교와 아닌 고등학교를 대상으로 스마트교육을 구현하는 학교는 어떤 학교이고, 스마트교육 개념은 학생들의 정서에 어떤 영향을 주었으며, 스마트교육 개념은 학생들의 학업성취에 어떤 영향을 미쳤는가에 대한 답을 찾으려는 것이다. 이런 목적을 달성하기 위하여 학교알리미(www.schoolinfo.go.kr)에서 독립변인으로 학습효과, 정서효과의 항목을 추출하여 상대적으로 배경변인이 비슷한 세종시 한솔고등학교와 과천에 있는 고등학교를 추출하여 비교 분석하였다. 스마트교육의 개념과 특징 등을 문헌조사하여 스마트교육 개념을 도입하고 있는 세종시에 위치한 고등학교를 선정하였으며, 학교알리미에서 '결산자료', '전출입 및 학업중단 학생 수', '학교폭력 실태조사', '국가학업성취도 평가에 관한 사항'을 바탕으로 학습효과와 정서효과를 분석하였다. 또한 스마트교육 효과가 나타난 학교의 예산구조를 파악하여, 스마트교육 확산을 위한 예산구조를 분석하였다. 연구결과로 학교 폭력 실태를 비교한 결과, 3년 동안 두 학교 모두 학교 폭력 사태가 줄어드는 경향을 보였으나, 세종시에 있는 한솔고등학교가 과천에 있는 고등학교보다 더 낮은 학교 폭력 피해율을 보였다. 국어, 수학, 영어 과목의 국가학업성취도 평가에서 3년 동안 세종시 한솔고등학교가 과천에 있는 고등학교보다 높은 수치를 나타내었다. 특히, 스마트교육이 본격적으로 시작되기 전인 2013년에는 두 개교가 유의미한 차이를 보이지 않았으나, 2014년과 2015년의 2년에 걸친 조사에서 세종시 한솔고등학교의 수학과 영어 과목학업성취가 과천 고등학교보다 더 높은 경향을 보여주어, 표집의 한계에도 불구하고 스마트교육이 학업성취에 정적인 가능성을 보이는 것으로 나타났다. 이런 결과에도 불구하고, 자료의 수집의 한계와 표집의 제한성 등은 향후 스마트교육을 확대시키기 위하여 좀 더 면밀하게 연구되어야 할 필요성을 제시해 준다. The purpose of this study is to analyze the effectiveness of secondary school SMART education. In order to achieve this, the paper separated the high school which implements the smart education for the high school and the high school which did not apply the smart education concept, then figuring out the answer about what school is more effective, the influence of the smart education concept on the students' emotions and academic achievement. This paper analyzed the effectiveness of SMART Education between Hansol high school in SeJong city and Jungang high school in Gwachen city by using 'schoolinfo (www.schoolinfor.go.kr) SMART education.' This study first presented the SMART Education's concept and characteristics through reviewing some literature, and then categorized the characteristics by using the items included academic achievement and emotional effect. These items consist of the 'students academic scores' for the academic achievement, 'the number of students dropped out' and 'the damage rate of school violence' for the emotional items. The conclusion of this study is that Hansol high school indicates lower school violence rate than Gwachen high schools with the two school's violence rate decreasing. Moreover, students' score of Hansol high school is higher than high schools in Gwachen city. The SMART education school budget structure is 'Common type', which requires a lot of investment to 'Basic education activities', 'educational activities support', 'School general operating expenses' among education budget items.
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김웅수(Woongsoo Kim),송일석(Ilseok Song),신종현(Jonghyun Shin),오천환(Cheonhwan Oh),김은아(Eunah Kim),김극태(Keugtae Kim),김현자(Hyunja Kim),김종수(Kim, Jongsu Kim),최윤호(Yunho Choi) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.3
Objectives: The pollution status of heavy metals within the soil was investigated with an aim to establishing a sustainable soil environment within parks and amusement facilities installed in urban areas of Gyeonggi–do Province. Methods: As sampling sites, 14 locations were selected from a city with a number of factories near a residential area, a residential area, and a children s park in a city with mixed green areas. Seven kinds of heavy metals, including Cd, Pb, and Hg, and the pH of soil were analyzed three times by inductively coupled plasma optical emission spectroscopy (ICP-OES) and atomic absorption spectrometer (AAS). Results: In this study, the pH of the samples from the residential park and industrial park showed 5.7-6.5 and 5.9-7.0, respectively. The overall mean concentration (mg/kg) of heavy metals was Zn (132.8), Ni (73.0), Cu (47.4), Pb (35.9), As (4.84), Cd (0.39), and Hg (0.07), indicating that these concentrations of heavy metals were lower than those for the area 1 standard of soil pollution concern criteria. In addition, the sampling sites in the residential area and the industrial area also showed the same tendency for concentration distribution. Conclusions: We found that the soil pollution class (SPC) of some spots were over 200, which are third and fourth classes. In order to manage a sustainable soil environment in a city park, it is suggested that local governments, the management bodies for these parks, need to manage, supervise, and investigate soil pollution and quickly replace contaminated soil.
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미이용 바이오매스의 이산화탄소 활성화를 통한 바이오카본 생산: 포름알데하이드 및 아세트알데하이드 제거 특성
김종수(JongSu Kim),최석천(SeukCheun Choi),이은도(Uendo Lee),박은석(EunSeuk Park),정수화(Soohwa Jeong) 한국청정기술학회 2021 청정기술 Vol.27 No.4
본 연구에서는 미이용 바이오매스인 3급 목재펠렛 및 커피박을 이용하여 바이오카본을 생산하고 이를 통하여 저분자 극성 휘발성 유기화합물인 포름알데하이드 및 아세트알데하이드 제거 성능 실험을 수행하였다. 바이오카본 생산 실험은 이산화탄소를 활성화제로 사용하여 고정층 반응기에서 수행하였다. 활성화 실험 시 반응온도 900 ℃ 및 이산화탄소 1 L min<SUP>-1</SUP>으로 반응조건을 고정하여 진행하였다. 활성화 실험 결과 1급 목재펠렛으로부터 생산한 바이오카본의 BET 비표면적이 약 788 ㎡ g<SUP>-1</SUP>으로 가장 높음을 알 수 있었고 커피박으로부터 생산한 바이오카본이 약 544 ㎡ g<SUP>-1</SUP>으로 가장 낮게 나타났다. 본 실험을 통해 생산된 바이오카본은 대부분 마이크로 기공을 가진 것으로 나타났다. 바이오매스 원료 내 회분의 함량이 낮을수록 바이오카본의 비표면적이 높아지는 것으로 나타났다. 포름알데하이드 및 아세트알데하이드 제거 실험 결과 1급 및 3급 목재펠렛으로부터 생산한 바이오카본에 비해 커피박으로부터 생산한 바이오카본이 더욱 우수한 흡착 성능을 보여주었다. 추가적으로 상용 첨착 활성탄과 커피박으로부터 생산한 바이오카본의 비교 실험을 진행하였다. 포름알데하이드 제거 성능은 상용 첨착 활성탄이 우수한 반면 아세트알데하이드 제거에는 커피박으로부터 생산한 바이오카본이 우수한 것으로 나타났다. In this study, bio-carbons were produced by activation process from unused biomass (Grade 3 wood pellet and spent coffee grounds) to determine the removal performance of formaldehyde and acetaldehyde. The activation experiments were conducted in a fixed bed reactor using CO₂ as an activation agent. The temperature of the activation reactor and input of CO₂ were 900 ℃ and 1 L min<SUP>-1</SUP> for all the experiments. The maximum BET surface area of about 788 ㎡ g<SUP>-1</SUP> was obtained for bio-carbon produced from Grade 1 wood pellet, whereas about 544 ㎡ g<SUP>-1</SUP> was achieved with bio-carbon produced from spent coffee grounds. In all the experiments, the bio-carbons produced were mainly found to have micro-porous nature. A lower ash amount in raw material was favored for the high surface area of bio-carbons. In the removal test of formaldehyde and acetaldehyde, the bio-carbon produced from spent coffee grounds showed excellent adsorption performance compared with woody biomass (Grade 1 wood pellet and Grade 3 wood pellet). In addition, the comparative experiment of commercial impregnated activated carbon and bio-carbon produced from spent coffee grounds was conducted. In terms of formaldehyde removal performance, the commercial impregnated bio-carbon was excellent, while bio-carbon produced from spent coffee grounds was excellent in acetaldehyde removal.
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중력장 내에서의 두 액적 충돌에 관한 수치 시뮬레이션에 관한 연구
김종수(Jongsu Kim),이창훈(Changhoon Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Even though there are numerous theories to explain the process of rain, it is not enough to do adequately. According to observation, the precipitation from the rapidly formed cloud, like squall or shower, has not been understood clearly. Generally, a relationship between droplet and nuclei or between droplets are well known reason for this phenomena and still challenging research part. Especially, in tropics, the relationship between droplets is more important than the other due to temperature. Hence, in this research the numerical simulation between droplets within gravity force field like the earth has been performed. The objective of the research is not only to identify physical properties but also to figure out droplets itself and nearby flows, hence, the Level Set method has been used to track the interface of droplets correctly. The result is verified using existing work, droplet collision without gravity force, and using this model we’d like to show collision
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