구두 발표 : 구두발표(OC) - 농업화학 및 생태,식품분야 ; 토양 유기물 함량에 따른 유기염소계 살충제 Endosulfan의 흡착 특성

황정인 ( Jeong In Hwang ),전영환 ( Young Hwan Jeon ),김정민 ( Jung Min Kim ),석다롱 ( Da Rong Seok ),이은향 ( Eun Hyang Lee ),전상오 ( Sang Oh Jeon ),이성은 ( Sung Eun Lee ),김장억 ( Jang Eok Kim ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-

A study on fate and behavior of endosulfan, which is an organochlorine insecticide detected mainly in Korean soil, is important due to its toxicity and persistence in soil environment. To estimate isotherms for the adsorption of endosulfan isomers (α-, β-) and their metabolite (-sulfate) in soil, their adsorption amounts were investigated in various soils containing different organic matter contents. The tested soils were collected at Ansim and Gunwi, and some of them were prepared as organic matter-removed (OMR) samples using H2O2. As time-dependent adsorbed amounts of endosulfan reached to their equilibrium after 6 h in Ansim, Gunwi and OMR Ansim soils, OMR Gunwi soil did not adsorb the pesticide within 24 h. The adsorption isotherms of endosulfan isomers and their metabolite fitted to Freundlich adsorption isotherms for three equilibrated soil samples. The correlation coefficients (R2) of the isotherms were greater than 0.964. Freundlich adsorption coefficient (Kf) ranged from 8.66 to 19.20 for α-endosulfan, from 7.08 to 20.49 for β-endosulfan and from 8.62 to 17.98 for endosulfan-sulfate, respectively. The difference of Kf values of endosulfan indicated that the adsorption amount of endosulfan was dependent on the contents of organic matter. Therefore, the behavior of endosulfan in soil environment is definitely affected by the amount of organic matters in soil.

폐소형가전제품 재활용 현황과 전망

정인상,박지환,황종수,최원희,Jung, Insang,Park, Jihwan,Hwang, Jongsoo,Choi, Wonhee 한국자원리싸이클링학회 2015 資源 리싸이클링 Vol.24 No.4

폐전자제품의 증가로 인해 재활용의 중요성이 대두되었으며, 그 중 폐소형가전제품은 다양한 품목과 구성품으로 인해 재활용이 어려운 실정이다. 폐소형가전제품에 함유되어 있는 주요금속은 철, 구리, 알루미늄이며, 그 외에 PCBs, 플라스틱 등 다양한 구성품으로 이루어져 있다. 국내외에서 폐전자제품에 대한 재활용 규제가 시행되고 있지만 폐소형가전제품의 재활용 기술은 그 규제를 따라가지 못하는 실정이다. 폐소형가전제품의 재활용 공정은 아직 제대로 보급화 되지 않았으며, 개발이 된다면 국가 기술경쟁력(자원재활용률 등)이 증가할 뿐만 아니라, 자원비축, 환경문제 해결 및 경제성 확보 등 많은 긍정적 효과를 기대할 수 있을 것이다. 따라서 폐소형가전제품의 재자원화 가치와 국내외 기술현황 분석을 통하여 재활용공정 제언 및 앞으로 나가야할 방향을 살펴보고자 한다. The importance of recycling came to the fore by increasing of waste electrical and electronic equipment(WEEE) generation. Small WEEE recycling in particular represents a big challenge in Korea because it has various items and components. Main materials of small WEEE are typically well known for metals (copper, iron, aluminum, etc.), PCBs and plastics. Not only Korea but also overseas, the laws for small WEEE were in effect in order to recycle effectively, but the technology is not catched up with the regulation which has to recycle an allocated account of WEEE. In addition, recycling technologies and processes for small WEEE are not developed enough to recycling center properly. In that sense, if we develope the recycling process, have not only technology competitiveness but also resource conservation, improving the environment and economic profits. Therefore, through the analysis of economic value of recycled small WEEE, and current technologies both domestically and internationally, we design conceptual recycling process of small WEEE, and consider the way forward.

전투기급 항공기의 흡입구 성능 분석을 위한 풍동시험 기법

황배근(Bae-Geun Hwang),정인면(In-Myun Jung),이상수(Sang-Soo Lee),박시영(Si-Young Park),노현우(Hyun-Woo Roh) 한국항공우주학회 2020 한국항공우주학회 학술발표회 논문집 Vol.2020 No.7

약물치료의 예후가 불량한 나팔관임신에서의 초음파 유도하 임신낭내 methotrexate 주입법을 이용한 보존적 치료 2예

황선정 ( Sun Jung Hwang ),이수정 ( Soo Jeong Lee ),김슬아 ( Sul Ah Kim ),최정인 ( Jeong In Choi ),신종철 ( Jong Chul Shin ),최세경 ( Sae Kyung Choi ) 대한산부인과학회 2012 Obstetrics & Gynecology Science Vol.55 No.11

Ectopic pregnancy occurs in about 2% of pregnant women, and may seriously compromise women`s health. Extra uterine implantation can occur anywhere along the reproductive tract with the most common implantation site in the fallopian tube. At early stages of presentation where the risk of rupture of a tubal pregnancy is minimal, medical therapy using methotrexate (MTX) given systemically or injected directly into the ectopic pregnancy is an option occasionally used with good results. In addition, ultrasound technology, particularly the introduction of high-resolution transvaginal probes, has been the driving force behind the revolutionary change towards conservative management strategies in ectopic pregnancy care. Tubal pregnancy can be successfully managed without surgical intervention through local injection of MTX. This treatment not only ablates the ectopic pregnancy but also preserves the salpinx without systemic side effect. In this report, we present two cases of tubal pregnancy which treated successfully with ultrasound-guided intraamnionic MTX injection.

03 구두발표 : 구두발표(OA) - 농업환경 및 토양,수질 분야 ; OA-02 : 토성이 다른 토양 중 Endosulfan 이성질체의 잔류양상 예측

황정인 ( Jeong In Hwang ),전상오 ( Sang Oh Jeon ),이상협 ( Sang Hyeob Lee ),강민수 ( Min Su Kang ),정혜현 ( Hye Hyun Jung ),곽세연 ( Se Yeon Kwak ),이성은 ( Sung Eun Lee ),김장억 ( Jang Eok Kim ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-

Pesticides persisted in soil environment may be subjected to the unexpected uptake by plant root. As these absorbed pesticides can result eventually in safety problems to agricultural products, it is required to predict the plant uptake extent of soil-persisting pesticides inadvance. One of the previous prediction methods is to assess the uptake extent using a mathematical model. When developing the plant uptake model of soil-persisting pesticides, adsorption and dissipation interactions between pesticides and soil may be parameters that play major roles in determining the uptake extent into plant. With considerations of parameters relative to these interactions, we developed a chemical-specific residue (CSR) model, Ce(t)=C0·(1/2)t/T/Kd, in order to predict the residual patterns of endosulfan isomers ( - and  -) in soils containing different organic matter contents. The adsorption (Kd) and dissipation (T) parameters were obtained from indoor experiments, and the applicability of CSR model was assessed by comparing between experimental measurements and modeled estimates. The Kd and T values were significantly varied depending on organic matter contents in the tested soils. For the low organic matter-containing soil, the Kd and T values of the  -isomer were 50.2 mL g-1 and 16 d, respectively; the values of the  -isomer were 54.4 mL g-1 and 231 d, respectively. On the other hand, for the high organic matter-containing soil, the Kd values were 377.4 mL g-1 for the  -isomer and 407.4 mL g-1 for the  -isomer, and the T values for the  - and  -isomers were 139 and 347 d, respectively. Using these parameter values, the modeled values were in good agreement with the measured values with standard errors of less than 23.5%. Therefore, the developed CSR model may be used as a tool for predicting the residual amount of endosulfan in soil.

국가직무능력표준(NCS) 커피교육과정 SWOT분석

정인성 ( Jung In-sung ),황규범 ( Hwang Gyu-beom ) 한국융합과학회 2018 한국융합과학회지 Vol.7 No.3

연구목적: 본 연구는 국가직무능력표준(NCS) 커피교육과정 SWOT분석을 통해 현재 커피산업 분야의 교육적인 측면의 동향을 파악하는데 연구의 주된 목적이 있다. 연구방법: 본 연구는 2017년 7월 1 일~7월 30일까지 약 30일 동안 9명의 커피산업에 종사하고 있는 전문가들을 대상으로 SWOT기법을 적용한 질문지법과 심층면담기법을 활용하여 수행되었다. 결론: 결론은 다음과 같다. 첫째, NCS 강점요인은 교육비 지원과 취업 및 재취업의 부담감소, 전문 인력 개발 및 인프라 구성에 유용한 체계화된 교육, 교육과정 이수 후 강점요인은 커피산업 현장 전문가 양성, 장기간 체계적 교육 및 현장 실무위주 실습, 다양한 분야 학습, 교육과정 이수 후에 대한 비전으로는 전문적 지식을 가진 바리스타들이 현재 및 향 후 커피산업의 발전에 지속적인 영향을 미칠 것으로 전망된다. 둘째, NCS 약점요인은 커피산업 종사자 대부분이 NCS 교육과정에 대한 인식이 부족, 빠르게 변하고 있는 커피 커피산업의 트랜드를 충족시키지 못함, 교육의 질 저하와 함께 이론적 내용의 부족함, 현장실습 교육 필요함 등으로 나타났다. 셋째, NCS 위협요인은 종사자의 낮은 연령과 피교육자의 연령이 높을 때는 별다른 교육과정 없이 현장에 투입됨으로써 진입장벽이 현저히 낮다. 특히, 짧은 기간에 이루어지는 주입식 교육, 낮은 교육수준, 변화를 따라가지 못하는 교육 등이다. 넷째, NCS 기회요인은 현장중심으로 체계화된 교육과정을 통한 전문가 양성, 질 높은 평생교육기회 부여, 이수자들의 체계적인 경력 및 인력관리 현장중심 교육과정의 업데이트, 현장중심의 실무교육, 교육·훈련·자격·연계교육 시스템 적용이 필요하다. Pupose: This study aims to figure out a trend of an educational aspect of the coffee industry by the SWOT analysis of a National Competency Standards (NCS) education of the coffee. Method: This study was done by surveys and interviews which are implied SWOT with nine coffee specialists from 1st to 30th, July 2017. Conclusion: First, the strengths of NCS are supporting education costs, decreasing burdens of finding and re-finding jobs, and systemized education for nurturing professionals and building infrastructure; the strengths of post-education are training experts, long-term systemized education and work experience, and diverse education. The vision of post-education are predicted the baristas equipped professional knowledge affect the present and future development of the coffee industry. Second, a lack of awareness about NCS education of most workers at the coffee industry, fulfilling not a trend of the coffee industry changing rapidly, decreasing the quality of the education and lack of theory, and the needs of field experience are the weaknesses of NCS. Third, low entry barriers, that an aged trainee with a young worker would work on the field without some educational processes, are threat of NCS. Especially, learning by rote within short period, low educational levels, and educational process that does not fit in the trend are the threats of NCS. Fourth, the opportunities of NCS are training experts with systemized educational process in the middle of the filed, whole-life education of high-quality, systematic managing career and job capacity of the trainees. For this, these are needed such as update of field education, real work experience on the field, related education system of education, training, and qualifying.

SAN 공중합을 위한 열적 개시 반응의 속도상수 추정 및 반응기 해석

최정인(Jung In Chey),황우현(Woo Hyeon Hwang),이현구(Hyun Ku Rhee) 한국화학공학회 1996 화학공학의이론과응용 Vol.2 No.1

토양잔류 농약의 무 흡수양상 및 토양 안전관리기준 설정

황정인 ( Jeong-in Hwang ),곽세연 ( Se-yeon Kwak ),이상협 ( Sang-hyeob Lee ),강민수 ( Min-su Kang ),류준상 ( Jun-sang Ryu ),강자군 ( Ja-gun Kang ),정혜현 ( Hye-hyeon Jung ),홍성현 ( Sung-hyeon Hong ),김장억 ( Jang-eok Kim ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.4

BACKGROUND: Uptake patterns of α-, β-isomers and sulfate metabolite of endosulfan (ED) by radishes grown in treated soils with ED concentrations of 2 and 10 mg/kg were investigated to establish soil management guidelines for ensuring the safety of radishes from ED residues. METHODS AND RESULTS: All samples of soils and radish plants separated into shoot and root parts were analyzed for ED residues using a gas-chromatography mass spectrophotometer, and the results were used to calculate the bioconcentration factor (BCF), indicating the ratio of ED concentrations between radishes and soils. During the experimental period, uptake and distribution rates of ED-sulfate in radishes were the highest, followed by α- and β-ED. The BCF values to initial ED concentrations in soils were greater for root parts (0.0077 to 0.2345) than for shoot parts (0.0002 to 0.0429) and used to obtain regression equations by time. Long-term BCFs estimated by the obtained equations (R² of 0.86 to 1.00) were evaluated with the maximum residue limit (0.1 mg/kg) of ED for radishes, in order to suggest safe management guidelines of ED for radish-cultivating soils. CONCLUSION: Suggested guidelines showed the significant dependency on duration for radish cultivation and exposed concentration of ED in soil.

초임계 이산화탄소를 이용한 캐놀라 오일 추출

황아름(Ah-Reum Hwang),정인일(In-Il Jung),임교빈(Gio-Bin Lim),유종훈(Jong-Hoon Ryu) 한국생물공학회 2009 KSBB Journal Vol.24 No.4

본 연구에서는 초임계 이산화탄소 추출기술의 scale-up 을 위한 기초 연구로서 추출 용량이 다른 두 종류의 초임계 추출장치를 사용하여 추출기 용량, 초임계 이산화탄소의 흐름방향, 캐놀라 씨앗 입자의 크기, 온도, 압력 등의 공정변수가 캐놀라 오일의 추출 속도와 수율에 미치는 영향을 조사하였다. 분쇄된 씨앗의 입자 크기가 작을수록 추출 효율이 증가하였으며, 약 330 bar 이하의 압력에서는 온도가 증가함에 따라 추출 효율이 감소하고, 330 bar 이상의 압력 범위에서는 온도 증가와 함께 추출 효율이 증가하는 crossover 지점이 나타나는 것을 확인하였다. 추출기의 용량을 10배 증가시킨 경우 추출용량이 추출 수율에 거의 영향을 미치지 않는 다는 것을 알 수 있었으며, 초임계 이산화탄소가 추출기 아래에서 위로 흐르는 경우 반대 방향에 비해 추출 속도가 훨씬 더 높다는 사실을 확인하였다. 또한, 초임계 이산화탄소로 추출된 캐놀라 오일의 트리글리세라이드와 지방산의 조성은 유기용매 추출에 의해 얻은 오일의 조성과 비슷하였으며, 추출 시간이나 초임계 유체의 흐름 방향에 따라서도 오일 조성에 큰 변화가 없음을 확인하였다. In this study, two supercritical extraction systems of different scale, analytical-scale and lab-scale, were employed to investigate the extraction efficiency of canola oil from canola seeds using supercritical carbon dioxide (SCCO2) as an extraction solvent. The effects of various parameters such as extraction temperature (40~80℃), pressure (200~500 bar), particle size, and SCCO2 flow direction on the extraction rate and yield were examined in detail. Triglycerides and fatty acids in the extracted canola oil were analyzed quantitatively by high-performance liquid chromatography and gas chromatography. The solubility values of canola oil in SCCO2 could be calculated from the experimental results. Similar extraction yields were obtained from both analytical-scale and lab-scale extraction systems. The extraction rates obtained under solvent SCCO2) upflow conditions were found to be higher than those of solvent downflow extraction. However, the effect of SCCO2 flow direction on the extraction yield was observed to be relatively insignificant.

BESTOBEAM 전단연결재의 길이에 따른 전단 내력 평가

안형준,정인용,김영주,황재선,Ahn, Hyung Joon,Jung, In Yong,Kim, Young Ju,Hwang, Jae Sun 한국강구조학회 2015 韓國鋼構造學會 論文集 Vol.27 No.5

앵글을 전단연결재로 사용한 시공개선형 합성보(BESTOBEAM)의 전단연결재 길이에 따른 전단 내력을 실험적으로 평가하고 전단내력 설계식을 제안하였다. Eurocode 4의 경우와 달리 BESTOBEAM의 전단연결재는 등분포 하중을 받는 보의 거동과 유사하며 그 순경간(BESTO Width)에 따라 전단 내력이 달라진다. BESTO Width와 콘크리트의 강도에 따른 전단 내력을 Push-out 실험을 통해 측정한 결과 BESTO Width가 길어질수록 내력이 감소하고 연성능력은 증가하는 경향을 보였다. 실험결과를 반영하여 Eurocode 4의 설계식을 수정하여 새로운 설계식을 제안하였다. 제안된 설계식을 통해 예측된 전단연결재의 강도는 10% 오차 범위 이내로 잘 맞는 것을 확인할 수 있었다. 따라서 앵글을 전단연결재로 사용한 BESTOBEAM의 전단 강도 설계에 제안된 식을 사용할 수 있을 것으로 판단된다. Shear resistance of BESTOBEAM, which has angle as shear connector and was developed with purpose of easy construction, was tested. With the test results shear resistance design equation was proposed. Unlike angle connector of Eurocode 4, BESTO BEMA shear connector behaves like fixed-end beam. Therefor longer span of the shear connector the lower shear resistance it has. As a result, shear resistance of BESTOBEAM shear connector according to its length tends to decrease as its length gets longer. The authors proposed design equation of angle shear connector sased on the test results. The results from the test and the proposed equation match within 10% error range. Therefore the proposed equation can be used for designing shear connector of BESTOBEAM.