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Cho Il Kyu,Seol Jae Ung,Rahman Md. Musfiqur,Lee Dong-Gi,Son Hyeongkyu,Cho Hoon 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.1
GreenTD (Dichlorobenzyl derivative, MW 362.17) is a new dichlorobenzyl derivative algaecide. It is effective and selective against harmful algal blooms (HABs). HABs cause serious problems for public health and fishery industries. Algae that cause HABs include Microcystis spp., Anabaena spp., and Aphanizomenon spp. Blooms of toxin-producing Microcystis aeruginosa occur regularly in fresh water where is rich in nitrogen and phosphorus nutrients. Environmental fate studies are needed to investigate the degradation of GreenTD. In the present study, we studied the persistence of GreenTD (90% aqueous solution) in water and toxic effects GreenTD on M. aeruginosa and reduction of microcystin production in the culture media. GreenTD was added in the water pots and microcystis media tubes at levels of 25 g/0.1 ha (0.5 mg/kg) and 50 g/0.1 ha (1.0 mg/kg). Samples were collected after 1, 3, 5, 7 and 14 days. The residues of GreenTD and microcystins in water and the media were determined using high performance liquid chromatography- diode array detection and ultra-performance liquid chromatography-tandem mass spectrometry, respectively. The half-life of GreenTD at concentrations of 0.5 and 1.0 mg/kg was 4.5 and 3.6 days, respectively. This result presents a safety level suitable for the acceptable guideline of water residue. The average recoveries of microcystins RR, YR, LR, and LA were 106–115%, 103–110%, 96–105% and 89–113% in the microcystis media, respectively. The limit of detection of (LOD) the microcystins was 0.1 μg/kg. No microcystins in the media were detected at the LOD (0.1 μg/ kg). GreenTD at concentrations of 0.2 and 0.5 μg/kg had a 100% of control efficacy of M. aeruginosa. No growth of the blue-green algae was observed after 14 days of GreenTD application.
조형규(Hyeongkyu Cho),임형철(Hyoung-Chul Lim) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
본 연구는 공간구문론의 분석에 있어, 도로 중심축을 기준으로 축선도를 작성하는 경우와 보행로를 기준으로 축선도를 작성하는 경우에 대해 살펴보았다. 각각의 축선도가 어떤 분석에 있어 적합한지 살펴본 결과, 도로중심축을 따른 축선도는 큰 규모의 지역을 거시적인 차원에서 분석할 때 적합한 반면, 보행로를 따른 축선도는 작은 규모의 지역을 미시적인 차원에서 분석할 때 적합하다는 것을 알 수 있었다.
조형규(Hyeongkyu Cho),전유진(Yujin Jun),하수훈(Soohun Ha),최진혁(Jinhyeok Choi) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
본 연구는 아이트래킹 기법을 활용하여 도시건축경관에 대한 분석을 실시한 연구의 동향을 살펴보았다. 국내의 건축 도시 분야 아이트래킹 선행연구는 크게 두 가지로 구성된다고 볼 수 있다. 첫째는 건축 도시 분야에 아이트래킹 기법을 적용하기 위한 기법 구축 및 실험방법론 등에 대한 연구가 있고, 둘째는 건축 도시 분야 연구주제를 설정하고 이에 대해 아이트래킹 기법을 적용한 연구가 있다.
조형규(Hyeongkyu Cho),서형준(Hyeongjoon Seo),김종문(Jongmoon Kim),주영주(Youngju Joo),황준(Jun Hwang),송우석(Wooseog Song) 대한설비공학회 2017 대한설비공학회 학술발표대회논문집 Vol.2017 No.6
A comparison of the thermal comfort according to the discharge air flow of the ceiling type 1-way air conditioner with the long distance flow cooling and the comfortable cooling is experimentally examined in the residential environment laboratory. To improve thermal comfort, the characteristics of the discharge air flow of the air conditioner were investigated by measuring the temperature, velocity and PMV. Due to the effect of the hybrid flow path, occupant zone maintained uniform temperature and the discharge air flow distance to the air conditioner was improved.