사토양와 양토 재배 후작물 중 Diquat dibromide의 약해와 전이

조일규 ( Il Kyu Cho ),양해룡 ( Hae-Ryong Yang ),설재웅 ( Jae Ung Seol ),오영곤 ( Young Goun Oh ),이동기 ( Dong-gi Lee ),김지명 ( Ji Myung Kim ),김원일 ( Won-il Kim ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

Diquat dibromide (1,1’-ethylene-2,2’-bipyridyldiylium dibromide) is known as a fast-acting nonselective herbicide and plant growth regulator. This agrochemical causes injury to the parts of the plant to which it is applied. However, it may be fatal to humans if swallowed and inhaled even though it is used to desiccate potato vines and seed crops. This study was carried out to understand the safety of the following crops such as pepper, radish, lettuce and corn through phytotoxicity and residual evaluation in the unintentional contamination of the higher residual diquat dibromide. The diquat dibromide was analyzed by using the LC-TriQ-MS/MS. The diquat dibromide was determined after 30 days of crop cultivation in soil which had been applied with 35 and 90 mg/kg of diquat dibromide. The diquat dibromide remained 26.3∼28.1 and 70.9∼75.8 mg/kg at the 35 mg/kg and 90 mg/kg of diquat dibromide-treated soil, respectively. This result indicated that diquat dibromide did not convert to other metabolites and resided mostly in the soil during crop cultivation even though it was partially decomposed. In addition, the diquat dibromide were found around 0.01 mg/kg and below the detection of limit (0.01 mg/kg) in the 47 day-elapsed pepper and radish as well as 30 day-elapsed lettuce and corn cultivating in sandy loam and loam soil which were treated with 90 mg/kg of diquat dibromide.

폴리 아크릴 레진의 누수 보수 평가에 관한 연구

조일규 ( Cho Il-kyu ),김근허 ( Kim Keun-hur ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using cement and acrylics in combination. As a first study, we tried to verify the performance of improve the performance by checking the product properties according to the composition ratio of polyacrylic resin. Polyacrylic resin is evaluated in three different composition ratios. When the material is selected for polyacrylic resin, it is applied to the field to understand the maintenance effect and durability

생태계 유출 왕우렁이 관리를 위한 유인망 효과

조일규 ( Il Kyu Cho ),이종현 ( Jong Hyun Lee ),조우영 ( Woo Young Cho ),홍성준 ( Sung-jun Hong ),형기우 ( Gi-woo Hyoung ) 한국환경농학회 2023 한국환경농학회 학술대회집 Vol.2023 No.0

Golden apple snails have been utilized since 1992 in Korea to control weed growth in rice fields, exploiting their feeding behaviors. However, these snails have recently begun overwintering in the southern parts of Korea due to climate change, causing harm. In 2007, the Ministry of Environment categorized the golden apple snails as a second-class organism for ecological control. This study aims to develop an efficient trapping technique employing baited traps to eradicate the snails released into the surrounding ecosystems. The experiments were conducted in rice fields, agricultural reservoirs and freshwater lakes. The findings revealed that larger traps attracted more snails in small streams and lakes, although their effectiveness in rice fields and lakes was limited. Comparing various trap types, shrimp nets outperformed funnel traps in capturing golden apple snails, including a significant number measuring over 1 cm. Papaya leaves proved to be the most effective attractant for both shrimp nets and funnel traps, followed by potatoes, menthol-containing fish bait and papaya fruit. In the cultivation environment experiments, large funnel traps with papaya leaves captured 192 snails in 7 days, while traps with potatoes only caught 101 snails. This indicates that papaya leaves had roughly double the attraction effect compared to potatoes. However, the attraction effect decreased when focusing on snail capture in rice fields, their natural habitat, compared to experiments conducted in other areas. In the subsequent year, after applying pesticides to the snails on April 24, 2023, baited traps were installed on May 3, and after 6 days, on May 9, increased attraction was observed in large funnel traps with potatoes, melons, watermelons, papaya leaves and oriental melons. The results recommend installing large funnel traps in rice fields, agricultural reservoirs, drainage channels, and suitable locations, emphasizing snail capture and removal methods. Potatoes, melons and watermelons are recommended as attractants due to their ease of use for farmers.

왕우렁이 월동 방제 친환경농업자재 효과

조일규 ( Il Kyu Cho ),서민경 ( Min-kyoung Seo ),양현주 ( Hyun-joo Yang ),장소영 ( So-young Jang ) 한국환경농학회 2021 한국환경농학회 학술대회집 Vol.2021 No.-

왕우렁이(golden apple snails)는 1983년 식용목적으로 국내에 도입되었다가 1992년부터 왕우렁이의 섭식 특성을 활용하여 벼농사의 논 잡초 방제용으로 사용되기 시작하였다. 국내에 유입된 종은 Pomacea canaliculata 로 남아메리카가 원산지이며 국내에 서식하고 있는 토종우렁이와는 외형, 먹이, 번식 등에서 확연한 차이가 있다. 토종우렁이가 새끼로 번식하는 것에 비해 알로 번식하는 왕우렁이는 원산지인 열대지방에서는 왕우렁이가 벼의 해충으로 인식되고 있고, 필리핀, 대만 등 동남아시아 및 일본에서 벼농사의 심각한 피해를 주기 때문에 IUCN(세계자연보전 연맹)에서는 세계 100대 침입 외래종으로 분류하고 있다. 기후 온난화로 인해 국내에서도 왕우렁이가 월동을 하게 되면서 남부지역에 피해를 끼침으로 환경부는 2007년 왕우렁이를 법정 생태계 위해 생물 2등급으로 분류하고 있다. 본 시험에서는 왕우렁이 월동 방지를 위하여 친환경농업자재 5가지 제품(제품 1: 석회 유황, 제품 2: 황토 및 유황, 제품 3: 제충국 함유, 제품 4: 마트린 함유 제품 5: Pseudomonas chlorohaphis, O6)을 1000배, 2000배로 각각 희석하여 처리 후 시간대별로 활동성을 확인하였다. 24시간 이후 왕우렁이의 폐사 여부를 확인하여 방제률을 확인하였는데, 제품 3이 가장 우수한 왕우렁이 방제 효과를 보였으며, 그 다음으로 제품 1, 2, 4가 유사한 방제력을 나타냈으나 제품 5는 방제 효과가 없는 것으로 나타났는데 이는 Pseudomonas chlorohaphis가 왕우렁이 방제에 영향을 주지 않는 것으로 판단된다.

폴리아크릴 레진의 누수보수재 성능평가

조일규 ( Cho Il-kyu ),유재형 ( Yuh Jae Hyung ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2

In this study, various materials such as epoxy material, urethane material, cement material, and acrylic material are used to solve the water leakage occurring in underground structures. However, in the reality that the durability is insufficient and the effect is insufficient, it is aimed to improve the repairing effect by using acrylics. As a second study, it is confirmed that leachate can be used as a repair material by considering long time under water stability, elongation range test, fatigue resistance test, tube stability test, damage recovery performance ana temperature stability considering leakage environment for polyacrylate. In addition, this material is applied to Expansion Joint to perform leakage repair, and to verify the effect of repairing leakage by monitoring and visual observation of concrete humidification.

아스팔트 2액형 점착재의 누수보수 평가에 관한 연구

조일규 ( Cho Il-kyu ),김근허 ( Kim Keun-hur ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1

6This study is based on the evaluation of a single component injection type adhesive repair material and a new 2 component type used in leakage of underground concrete structures. The studies showed that based on different mix ratio of the 2 component type adhesive sealant comprised of an asphalt main and latex mixture agent the viscosity of the material compound differed significantly. Based on a permeability testing, injection and economic efficiency, and performance, the appropriate ratio was determined to be 6:1 and was proceeded to the KS F 4935 evaluation method. The 2 component type adhesive sealant uses a static mixer and a cartridge type container for the injection procedure and was able to satisfy the evaluation criteria outlined in the KS F 4935 standard.

농업환경화학분야에서 농업곤충단백체학의 응용에 관한 연구

조일규 ( Il Kyu Cho ) 한국환경농학회 2022 한국환경농학회 학술대회집 Vol.2022 No.-

Proteomics is the study of the proteome or the entirety of proteins. It has become an indispensable tool in basic, clinical and translational research. Proteomics techniques have been also applied for agricultural environmental chemistry field to identify a broad spectrum of proteins in living systems such as insect. It may give clues about nutritional value, yield production and food quality. In recent years, technical improvements in the mass spectrometry, bioinformatics, protein extraction and separation have made the high-throughput analysis of agricultural products. The study implicated two subject entitled “identification of protein related to dietary vitamin B₃ deficiency in Mediterranean fruit fly larvae” and “diet-induced over-expression of Flightless-I protein and its relation to Flightlessness in Mediterranean fruit fly, Ceratitis capitata”. The sterile insect technique (SIT) can effectively control medfly popuঢ lations. To rear healthy medflies for the purpose of SIT, it is essential to supplement B vitamins in the diet. However, the function of the dietary B vitamins in Ceratitis capitata larvae is not known. With the microscopic analysis, several organs in the head were examined and the spiracle formation and sensory organs were normally formed between the niacin-supplied and niacin-absent groups. However, formation of the ocular depression was differently developed between the two groups, although the hypostomal sclerite was formed properly. A total of 607 of the 1845 proteins were overexpressed and one third (598 proteins) were downexpressed in the niacin-deficient larvae, while about one third were similarly expressed. One of important overexpressed proteins was optomotor-blind protein in relation to wing development in the niacin-deficient medfly larvae. Likely, the Mediterranean fruit fly, Ceratitis capitata is among the most economically important pests worldwide. Understanding nutritional requirement helps rearing healthy medfly for biocontrol of its population in fields. Flight ability is a high priority criterion. Two groups of medfly larvae were reared with two identical component diets except one with fatty acids (diet A) and another without it (diet B). Adults from larvae reared on diet B demonstrated 20±8% of normal flight ability, whereas those from larvae reared on diet A displayed full flight ability of 97±1%. Proteomes were profiled to compare two groups of medfly pupae using shotgun proteomics to study dietary effects on flight ability. Differential protein profiles indicate that nutritional deficiency induced over-expression of flightless-I protein (fli-I) in medfly.

04 포스터 발표 : 대기 환경 분야(PA) ; PA-05 : 산화타이타늄 광 촉매 분해작용에 의한 sulfamethoxazole (SMX)과 그의 산화물의 급성독성 평가

조일규 ( Il Kyu Cho ),조인선 ( In Sun Cho ),설재웅 ( Jae Woong Seol ),간은성 ( Eun Sung Kan ) 한국환경농학회 2015 한국환경농학회 학술대회집 Vol.2015 No.-

The widespread detection of pharmaceutically active compounds, including many synthetic antimicrobial agents, in aquatic environments is raising public health concerns. As a result, there is growing interest in the development of innovative technologies to efficiently transform these compounds to non-toxic and pharmaceutically inactive byproducts. This work examines the photocatalytic degradation of sulfamethoxazole (SMX) and its oxidation products (Hydroxslated SMX, Dihydroxslated SMX and 3-amino 5-methylisoxazole) in aqueous suspensions of nanophase titanium dioxide (TiO2). Experimental results demonstrate that SMX is mineralized by TiO2 irradiated with ultraviolet-A light (UVA: 324≤λ≤400 nm). The acute toxicity of the SMX and its oxidation products were tested using 24 h born Daphnia magna at various dilutions based on the procedure as OECD Guideline 202. The EC50 (%) of 10 mg/kg SMX solution without any photocatalyst (A), 10 mg/kg SMX solution exposed with UV light (B), 10 mg/kg SMX solution exposed with solar light (C) and 10 mg/kg SMX solution treated by solar light with bicarbonate (HCO3 .) as an enhancer for photocatalytic reaction (D) were 74.8, >100.0, >100.0 and 37.5, respectively. The residue of SMX in the A, B, C and D sample were 11.00, <0.05, <0.05 and 5.00 mg/kg, respectively. Hydroxslated SMX, Dihydroxslated SMX and 3-amino 5-methylisoxazole in the samples were detected below the limit of detection (LOD), which was 0.01 mg/kg. Each UV light & solar photocatalyst showed better removal rate than solar photocatalyst treatment with HCO3.

2액형 점착 실링재의 누수보수재 평가에 관한 연구

조일규(Il-Kyu Cho),김근허(Keun-Hur Kim),오상근(Sang-Keun Oh) 한국건설순환자원학회 2016 한국건설순환자원학회 논문집 Vol.4 No.4

본 연구에서는 지하 콘크리트 구조물에 누수 발생 시 콘크리트 배면에 주입하여 보수를 시행하는 1액형 점착 실링재에 대해 알아보고 새로운 콘크리트 배면 주입재인 2액형 점착 실링재에 대한 평가를 진행하였다. 2액형 점착 실링재는 아스팔트 계열의 주제와 라텍스 계열의 증점제로 구성된 실링재이며, 주제와 증점제의 배합비에 따라 실링재의 점도편차가 크게 나타났다. 이에 주제와 증점제의 배합비를 투수시험을 통해 확인한 결과 주입성, 경제성, 성능을 고려하여 적정배합비를 6:1로 정하고 KS F4935 평가를 진행하였다. 2액형 점착 실링재는 static mixer를 활용한 카트리지 타입의 용기를 이용하여 주입이 가능하고 KS F 4935 시험방법에 따라 평가를 진행한 결과 KS 기준을 만족하였다. This study is based on the evaluation of a single component injection type adhesive repair material and a new 2 component type used in leakage of underground concrete structures. The studies showed that based on different mix ratio of the 2 component type adhesive sealant comprised of an asphalt main and latex mixture agent the viscosity of the material compound differed significantly. Based on a permeability testing, injection and economic efficiency, and performance, the appropriate ratio was determined to be 6:1 and was proceeded to the KS F 4935 evaluation method. The 2 component type adhesive sealant uses a static mixer and a cartridge type container for the injection procedure and was able to satisfy the evaluation criteria outlined in the KS F 4935 standard.

타설 콘크리트 부착형 복합방수재의 현장 적용성 평가에 관한 연구

조일규(Cho, Il Kyu),이종용(Lee, Jong Yong) 한국콘크리트학회 2012 한국콘크리트학회 학술대회 논문집 Vol.2012 No.11