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정태환 ( Tae Hwan Jung ),이준호 ( Jun Ho Lee ),이혜린 ( Hye Rin Lee ),박형진 ( Hyung Jin Park ),구교진 ( Kyo Jin Koo ) 한국건축시공학회 2011 한국건축시공학회 학술발표대회 논문집 Vol.11 No.1
Construction documents or Data is highly valuable as the information that process are stored in. However it is not systematically manage to a document, productivity decrease and important information that can be reused to other projects is lost. The purpose of this study is a development for linked management prototype of construction data and documents that can manage to construction documents along with data, based on stored data, create second information. It is anticipated that searching time and efforts will be effectively reduced.
회귀식을 사용한 하수처리장 방류수 COD<sub>Mn</sub> 농도의 총 유기탄소 및 난분해성 물질 농도 전환
이태환,이보미,허진,정명숙,강태구,Lee, Tae-Hwan,Lee, Bomi,Hur, Jin,Jung, Myung-Sook,Kang, Tae-Gu 한국물환경학회 2010 한국물환경학회지 Vol.26 No.6
Estimating the organic matter loadings from individual treated sewage has become important for establishment of effective management strategies to control refractory organic matter (R-OM) in watersheds. For this study, regression equations were constructed using treated sewage data to convert the chemical oxygen demand (COD) concentrations, which are mostly available from open database, into total organic carbon (TOC) and R-OM concentrations. Effluent samples were collected from five major sewage treatment plants (STPs) located upstream of the lake Paldang. Variations in the OM concentrations were not associated with either the location of the STP or the sampling season. The effluent investigated were characterized by higher ratio of R-OM with respect to biodegradable organic matter (B-OM) and higher presence of dissolved organic matters (DOM) versus particulate organic matter (POM). Compared to $COD_{Mn}$, $COD_{Cr}$ exhibited higher oxidation efficiencies and greater variations in the concentrations. The concentrations of $COD_{Mn}$ were positively correlated with dissolved organic carbon (DOC), total organic carbon (TOC), and R-OM concentrations. There was nearly no seasonal and annual variation in the regression equations between $COD_{Mn}$ and TOC or R-OM concentrations. The constructed regression equations for TOC and R-OM were $0.650({\pm}0.071){\times}COD_{Mn}+1.426({\pm}0.575)$ and $0.340({\pm}0.083){\times}COD_{Mn}+2.054({\pm}0.670)$, respectively. The established equations are expected to contribute to estimating OM loadings from the STPs into the lake Paldang and also to compensating for the deficiency of the data for effluent OM concentrations in STP.
학습자의 자발적인 e-learning 수용에 관한 연구
이태환(Lee, Tae-Hwan),서창교(Suh, Chang-Kyo) 한국경영교육학회 2009 경영교육연구 Vol.53 No.-
학습자들은 e-learning을 통해서 학습자와 학습자, 교수자와 학습자간의 쌍방향 의사소통이 가능하다. e-learning은 면대면이 아닌 온라인상에서 이루어지는 학습이라는 성격상 학습자의 자발적이고 적극적인 참여가 이루어 질 때 그 장점과 효과성이 발휘된다. e-learning 관련 선행연구에서는 연구의 초점이 주로 비자발적 상황 하에서 학습자의 수용에 관한 연구가 진행되어졌기 때문에 개인에게 선택권이 주어지는 자발적 환경에서도 선행연구에서 검증된 변수들이 e-learning 수용에 영향을 미치는를 확인할 필요가 있다. 본 연구는 온라인 외국어학습사이트를 대상으로 287부의 설문을 분석하였다. 분석결과 유용성, 용이성, 즐거움의 변수가 학습자의 태도, 행위의도, 실제사용에 유의한 영향을 끼치는 것을 검증하였다. 본 연구는 e-learning 학습에 있어서 내·외재적 동기의 중요성을 검증하였다는 데 시사점이 있다. E-learning is becoming an increasingly important part of education these days. Most of previous researches use Technology Acceptance Model(TAM)-related models to investigate the acceptance of students who use e-learning to complement their class courses. When instructors required students to use e-learning, TAM-related model could not measure the students' intention to accept e-learning properly because students had no choice but to accept e-learning. Using e-learning system as the target technology, we investigated the role of the extended Technology Acceptance Model in user acceptance of e-learning for voluntary study. It was students themselves who decided whether they would accept the e-learning or not in voluntary studies. Data collected from 287 undergraduate students were examined. Overall, the results provided support for the model as explaining acceptance of an e-learning system. The data showed easy of use and usefulness were the dominant factors affecting the attitude of students using e-learning. The result also showed perceived enjoyment significantly impacted their intention to use e-learning and the intention to use impacted e-learning usage.
하태환,이인복,권경석,이성복,송상현,윤순식,Ha, Tae-Hwan,Lee, In-Bok,Kwon, Kyeong-Seok,Lee, Sung-Bok,Song, Sang-Hyeon,Bitog, Jessie. P.,Yoon, Soon-Seek 한국농공학회 2012 한국농공학회논문집 Vol.54 No.1
In livestock industry, damage caused by the epidemic diseases such as Foot-and-Mouth Disease (FMD), Highly-Pathogenic-Avian-Influenza (HPAI) and Porcine-Reproductive-and-Respiratory-Syndrome (PRRS) was very serious. The financial loss incurred from FMD alone which occurred on Nov. 2011 in Korea was estimated at 3 billion won, 23 % of annual livestock industry production. The livestock industry in Korea has greater risk of disease infection because of high density production, etc. Investigating the spread of livestock diseases should consider both direct and indirect contact as well as other various factors including airborne. Airborne infection of livestock disease was first hypothesised in the early 1900s, however, field experimental studies are still limited. Furthermore, no protocol is available in detecting airborne viruses in the field. In this study, effective virus samplers were investigated by comparative analysis of the type of samplers used detect to airborne virus. Laboratory experiments were conducted to compare virus samplers such as Bio-sampler, Dust-sampler, Compact-Cascade-Impactor (CCI) and Microflow in detecting PRRSV. Samples were analyzed by Reverse-Transcription PCR to assess the efficiency of the instrument in detecting the airborne virus. First, samples were classified into five levels according to light intensity of gel images and then the classified results were normalized. In every case, Bio-sampler and Dust-sampler were comparable with each other and have shown to be more effective than CCI and Microflow samplers.
애멸구 밀도에 따른 벼 생육시기별 벼 줄무늬잎마름병 발병정도
노태환 ( Tae Hwan Noh ),정관호 ( Kwan Ho Jung ),서수좌 ( Su Joa Seo ),심형권 ( Hyeong Kwon Shim ),최만영 ( Man Young Choi ),박종철 ( Jong Chul Park ),이왕휴 ( Wang Hyu Lee ),김형무 ( Hyung Moo Kim ) 전북대학교 농업과학기술연구소 2013 농업생명과학연구 Vol.44 No.1
We have survey on Rice stripe virus (RSV) incidence according to the density of small brown plant hopper (SBPH) in the individual rice plant, both in the nursery box and in the growing stage. A group of viruliferous SBPH was made by inoculation to rice, Dongjin 1 was infected with RSV for one week and reared continuously on the diseased rice in net box. The inoculation density of 8 viruliferous SBPH per rice resulted in 100% infection of the disease. The infection rate were 15, 30 and 60% with the inoculation density of 1, 2 and 4 SBPH per plant, respectively. Virus disease incidence increased two times as the density of SBPH doubled. The SBPH was inoculated with a group of 10, 20, 40, 80 and 160 SBPH per nursery box. Minimum insect vector density required for the infection of the disease was 80 SBPH with the occurrence rate of 0.3% in RSV. The double score of 0.6% was also reached by the double density of 160 SBPH. However, RSV was not occurred with the inoculation density of 10 to 40 SBPH. In seedling stage of susceptible rice varieties in paddy field, the RSV disease index were 70% for Dongjin 1 and 61% for Unkwang. However for Nampyeong and Onnuri which were resistant varieties, the RSV disease index of 1 and 3% observed. In maximum tillering stage of the rice Dongjin 1 and Unkwang infected with the disease 24 and 19% of disease index, but resistance varieties were not infected with the disease.
하태환 ( Tae-hwan Ha ),이인복 ( In-bok Lee ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
국내에서 발생하고 있는 쓰레기는 매립 및 소각 등의 여러 가지 방법으로 처리되고 있는데 환경오염 및 악취 발생의 문제점으로 인하여 소각, 재활용 등과 같은 다양한 방법으로 분담하고 있지만 아직까지 매립에 의한 폐기물 처리가 전체의 60%에 이르고 있는 실정이다. 이처럼 매립에 의해 폐기물을 처리할 경우 매립지에서 배출되는 가스와 침출수에 의한 피해가 발생하게 되는데, 매립지에서 배출되는 매립 가스에는 암모니아, 황계열 악취물질 및 휘발성 유기화합물질 등이 혼합되어 있어 악취 관련 민원 발생의 원인이 되고 있다. 전국적으로 악취로 인한 민원 발생은 2001년 이후 해마다 증가해오고 있는데 악취의 정량적인 평가가 어려워서 원인 규명에 많은 어려움을 겪고 있다. 따라서 최근 전산유체역학(CFD)을 이용하여 악취 발생 메커니즘 및 악취 확산 현상에 대한 연구가 진행되고 있지만 대부분 지표 부근 풍향 및 풍속에 큰 영향을 주는 복잡한 지형을 고려하지 않았다. 이에 본 연구에서는 복잡한 지형을 시뮬레이션으로 구현하여 위생매립장의 악취 확산에 대해서 연구하고자 한다. 연구 대상으로 삼은 위생매립장은 대전시 유성구 금고동에 위치하고 있으며 매립면적은 404,153㎡이다. 또한 해발고 도는 70m이며 주변은 247m안 불무산에 의해 둘러싸여 있다. 매립장 주변은 주로 북북서풍의 바람이 0.5 ~ 2.0 ㎧의 풍속으로 불어오며 여름철에는 남서풍의 바람이 0.5 ~ 2.0 ㎧의 풍속이 불어온다. 이러한 기준 풍속을 지표면의 나무와 같은 장애물에 의한 높이별 풍속 분포를 설계하여 시뮬레이션에 적용하였다. 악취 확산 모델링을 위한 지형 모델은 지형의 복잡한 정도에 따라서 격자의 크기를 다르게 적용하여 자세한 계산이 필요한 영역의 격자는 최소 0.15m의 크기로 설계하였으며 상대적으로 자세한 계산이 필요하지 않은 영역의 격자는 최대 30m의 크기로 점차 커지도록 설계하여 전체 격자의 수를 약 170만개로 설계하여 효율적인 계산을 모의하였다. 시뮬레이션 결과 남남서풍 풍향의 바람이 1.5㎧의 풍속으로 불어올 때 매립지에서 산업단지 방향으로 500m 거리에서 4.07ppm의 암모니아가 측정되었으며 1500m에 위치한 산업단지에서는 측정되지 않았다. 또한 남서풍 풍향의 바람이 1.5㎧의 풍속으로 불어올 때 500m 거리에서 1.67ppm의 암모니아가 측정되었으며 산업단지에서는 0.9ppm의 악취가 측정되었다. 매립지에서 산업단지까지 암모니아가스 농도가 거리에 따라서 지수적으로 감소하는 경향을 확인할 수 있었다. 추후 현장에서 검측되는 암모니아 농도와 비교하여 산업단지에 대한 매립지 악취의 영향성을 평가할 수 있을 것으로 기대된다.