공동주택 지하구조물의 누수부위 성능복원용 보수기술

조일규(Cho, Il Kyu),오상근(Oh, Sang Keun) 대한건축학회 2018 建築 Vol.62 No.5

파프리카 중 tetraconazde의 수입 농산물 잔류허용기준 설정

조일규 ( Ii Kyu Cho ),오영곤 ( Young Gon Oh ),무스픽 ( Musfiqur Rahman ),설재웅 ( Jae Ung Seol ),이동기 ( Dong-gi Lee ),김지명 ( Ji Myung Kim ),정윤수 ( Yun Soo Jeong ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-

The import tolerance of tetraconazole in paprika was proposed using OECD Maximum Residue Limit (MRL) calculator after conducting three different field trials to promote export of it to Taiwan. Pre-harvest interval (PHI) of residual pattern and degradation dynamic of tetraconazole in paprika were determined using ultra performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Samples were extracted with acetonitrile and a mixture of salts and dilution was performed for purification. A six point matrix matched calibration curve was constructed which provided excellent linearity with coefficient of determination (R2) ≥ 0.999. The quantification limits were 0.001 mg/kg. The method was validated in quintuplicate at three different concentrations resulted acceptable recovery ranging from 89.9~104.6% with relative standard deviation (RSD) ≤ 1.2% among the three filed sites. The developed method was applied to the field treated sample harvested at different intervals. In PHI trial, the tetraconazole residues were ranged 0.28-0.99 mg/kg in the field site 1 (Hwasun), 0.44 ~ 0.97 mg/kg in the field site 2 (Jinju), and 0.15 ~ 0.51 mg/kg in the field site 3 (Nomwon). Whereas, in the degradation trial, the observed residues were 0.07 ~ 0.53 mg/kg in the field site 1 and 0.14 ~ 0.29 mg/kg in the field site 3, Consequently, the import tolerance of tetraconazole in paprika using OECD MRL calculator was proposed to 2.0 mg/kg, which is different as the MRL(1.0 mg/kg) for pimento established by Republic of Korea. In conclusion, the residue study supported to propose 2.0 mg/kg as a MRL of tetraconazole for paprika.

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.

농업용 저수지에서 Bisphenol A의 잔류실태조사

조일규 ( Il Kyu Cho ),남효송 ( Hyo Song Nam ),전용배 ( Yongbae Jeon ),박준성 ( Jun Sung Park ),나태웅 ( Tae Wong Na ),김백종 ( Back Jong Kim ),( Eunsung Kan ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.4

BACKGROUND: Significant amount of bisphenol A has been released from the manufacturing process of plastics, epoxy resins, dental material and flame retardants. Bisphenol A has been detected at trace levels in wastewater, surface water, landfill leachate and drinking water. However, the residual survey of bisphenol A has not been performed in agricultural reservoir beside agricultural environment cultivating crops. This study was conducted to monitor the residual bisphenol A in national agricultural reservoirs and understand a level of contamination of bisphenol A in the agricultural environment in Korea. METHODS AND RESULTS: The water and water sediment were collected at agricultural reservoirs in Chungnam, Chungbuk, Kyunggi, Jeonnam, Jeonbuk, Kyungnam and Kyungbuk province. Bisphenol A was analyzed by the LC-MS/MS with triple quad 4500. The recovery of water and water sediment in the agricultural reservoirs showed the level of 95.7~97.2% and 91.5 ~100.3%, respectively. CONCLUSION: Bisphenol A was detected at the level of 0.05 μg/L~0.18 μg/L and 0.1 μg/kg~34 μg/kg in water and water sediment of the reservoirs, respectively. Based on the results, the residue of bisphenol A will be tried in the crops surrounding these agricultural reservoirs where bisphenol A detected above 10 μg/kg of bisphenol A.

어찌씨 뒷가지의 파생 양상

조일규 ( Il Gyu Cho ) 한말연구학회 2015 한말연구 Vol.- No.38

This paper researches the forms of derivatives of adverbial derivative suffix found in the medieval, modern and current Korean language. The adverbial derivative suffixes in the medieval times contain ‘-이, -오/우, -아/어, -히, -로, -0(nul).’ The suffix ‘-이’ produces adverbs in combination with the derivative bases, such as verbs, adjectives, nouns, or adverbs. The suffix ‘-오/우’ produces adverbs in combination with the derivative bases, such as verbs or adjectives. The suffix ‘-아/어’ produces adverbs in combination with the derivative bases, such as verbs or adjectives. The suffix ‘-히’ produces adverbs in combination with the derivative bases, such as verbs, adjectives, nouns, or incomplete bases. The suffix ‘-로’ produces adverbs in combination with the derivative bases, such as verbs, nouns, or incomplete bases. The suffix ‘-0(null)’ produces adverbs in combination with the derivative bases, such as verbs, adjectives or nouns. The adverbial derivative suffixes in the modern times contain ‘-이, -오/우, - 아/어, -히, -로, -0(null).’ The suffix ‘-이’ produces adverbs in combination with the derivative bases, such as verbs, adjectives, nouns, or adverbs. The suffix ‘-오/우’ produces adverbs in combination with the derivative bases, such as verbs or adjectives. The suffix ‘-아/어’ produces adverbs in combination with the derivative bases, such as verbs or adjectives. The suffix ‘-히’ produces adverbs in combination with the derivative bases, such as verbs, adjectives, nouns, or incomplete bases. The suffix ‘-로’ produces adverbs in combination with the derivative bases, such as verbs, nouns, or incomplete bases. The suffix ‘-0(null)’ produces adverbs in combination with the derivative bases, such as verbs, adjectives or nouns. The adverbial derivative suffixes in the current times contain ‘-이, -오/우, - 아/어, -히, -로, -에, -껏, -리, -내, -추, -코, -다지, -쯤, -냥, -나마, -씩, -0.’

옥상녹화 및 인공지반녹화용 구리시트 방근재의 성능평가에 관한 연구

조일규 ( Il Kyu Cho ),권시원 ( Shi Won Kwon ),곽규성 ( Kyu Sung Kwak ),오상근 ( Sang Keun Oh ) 한국건축시공학회 2007 한국건축시공학회 학술발표대회 논문집 Vol.7 No.1

Selection of proper root barrier as destination part of greening is very important in Root penetration resistance plan. To select proper root barrier, it need to understand composition of greening part, size, kind of plant, connection with waterproofing layer. In this point of view, we have establish greening on the roof or concrete structure, not been understand the structural mechanism. It means that we misunderstood about purpose of greening and using it. So, chosen materials and construction method was not proper for greening, it caused water leakage and decrease performance of concrete structure. Therefore, we examine the practical use of copper sheet considering environmental condition for green roof. Water tightness by water of greening part, root penetration resistance test by root penetration, bacteria resistance by must or bacteria in soil, chemical resistance by rain and chemical agent of fertilizer, and load resistance by soil depth, size of plant. These suggested test methods could be referred as guideline to test in green roof system because of not exist any performance appraisal guideline or standard. Consequently, it should be analysis as technical and institutional subdividing test methods and it need to study constantly as varied angles

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.

급결마이크로시멘트 및 글리시딜아크릴레이트를 복합 적용한 누수현장 보수사례

조일규 ( Cho Il-kyu ),유재형 ( Yuh Jae Hyung ),오상근 ( Oh Sang-keun ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.2

This technology is a water leak repair technology using composite materials of concrete structures that block leakage of structures by injecting rapid microcement into the face of underground concrete to block water and injecting flexible glycidylacrylate. Rapid micro cement system repair materials are mixed with fine fibers to improve the flexural sensitivity of the material and to form a layer that blocks stabilized water at the back of the structure by allowing rapid and tight spatial filling during injection with high cohesion The glycidylacrylate repair material can control the expansion rate, and the external stress also has the characteristic that the form of the material is not destroyed or separated, which can also be applied to vibrating induced structures that produce repetitive fatigue loads, and has an effective durability in saline, alkali, acid (chloric acid, sulfuric acid, nitric acid).

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.

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.