• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문 발표회
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• pp.91-95
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• 2003

There is a problem to be solved for improvement of durability and safety supervision. When you do the waterproofing and anticorrosive work of main concrete from the design stage, the material and method of construction need to be correctly applied to appropriate circumstance conditions. Epoxy have mostly been used for concrete water tank structure. Lately, lots of subjects on adaption of polyurea resin waterproofing and anticorrosive are under discussion. Then, we attempt to approach by evaluating and comparing every capabilities with another waterproofs in this study. Performance evaluation items include the adherence performance, the imprint of seal performance, temperature dependence performance, promotion weatherizing ability, inner chemical performance, drinking water eruptive performance. Through the experiment analysis, we found that the polyurea resin waterproofing membrane is dominantly superior to other waterproofs. According to this study, we suggest the polyurea resin waterproofing membrane as a new waterproofing material for concrete structure.

• 한국산학기술학회논문지
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• 제13권1호
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• pp.456-461
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• 2012

본 연구에서는 글리세롤과 우레아를 이용하여 글리세롤카보네이트를 합성하는 반응을 진행하였다. ZnO와 Zn-Al 이원계 금속 산화물 촉매를 제조하고, 제조되어진 촉매를 사용하여 글리세롤의 전환율과 글리세롤카보네이트의 수율을 확인하였고, Al의 첨가에 따른 촉매 특성의 분석과 글리세롤카보네이트 합성반응에서의 역할에 대해 확인하였다. 글리세롤카보네이트 합성 반응에서 ZnO를 단독으로 촉매를 사용한 경우보다 Zn-Al 혼합 산화물을 촉매로 사용하여 반응하였을 때, 부반응이 억제되어 전환율 및 수율이 증가함을 확인하였다.

• 유기물자원화
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• 제9권1호
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• pp.49-55
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• 2001

남은 음식물을 갈아 액상으로 만든 기질을 이용하여 생효모를 함유한 생균제제사료(probiotics)를 생산하기 위해 효모의 호기적 액상발효를 시도하였다. 기질의 영양조성의 최적화를 위해 미리 진탕배양한 결과를 토대로 액상의 남은 음식물 기질에 우레아($0.5g/{\ell}$), 당밀($4g/{\ell}$), O-phosphate($0.4g/{\ell}$), yeast extract($1g/{\ell}$)를 첨가하여 2리터 용량의 발효기를 이용하여 Kluyveromyces marxianus와 Aspersillus. oryzae를 접종하여 통기발효 시킨 결과 12시간 내에 $1.4{\times}10^{10}/liter$의 생균효모농도를 얻을 수 있었다.

• 한국건축시공학회지
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• 제2권1호
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• pp.131-138
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• 2002

There is a problem to be solved for improvement of durability and safety supervision. When you do the waterproofing work of main concrete from the design stage, the material and method of construction need to be correctly applied to appropriate circumstance conditions. Epoxy have mostly been used for concrete water tank structure. Lately, lots of subjects on adaption of polyurea resin waterproofing and anticorrosive are under discussion. Then, we attempt to approach by evaluating and comparing every capabilities with another waterproofs in this study. Performance evaluation items include the adherence performance, the imprint of seal performance, temperature dependence performance, promotion weatherizing ability, Inner chemical performance. drinking water eruptive performance. Through the experiment analysis, we found that the polyurea resin waterproofing membrane is dominantly superior to other waterproofs. According to this study, we suggest the polyurea resin waterproofing membrane as a new waterproofing material for concrete structure.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.91-95
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• 2003

There is a problem to be solved for improvement of durability and safety supervision. When you do the waterproofing and anticorrosive work of main concrete from the design stage, the material and method of construction need to be correctly applied to appropriate circumstance conditions. Epoxy have mostly been used for concrete water tank structure. Lately, lots of subjects on adaption of polyurea resin waterproofing and anticorrosive are under discussion. Then, we attempt to approach by evaluating and comparing every capabilities with another waterproofs in this study. Performance evaluation items include the adherence performance. the imprint of seal performance, temperature dependence performance. promotion westernizing ability, inner chemical performance. drinking water eruptive performance. Through the experiment analysis, we found that the polyurea resin waterproofing membrane is dominantly superior to other waterproofs. According to this study, we suggest the polyurea resin waterproofing membrane as a new waterproofing material for concrete structure.

• 대한건축학회논문집:구조계
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• 제35권1호
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• pp.21-28
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• 2019

This study investigates the applicability of composite polyurea to contain fiber reinforcement like fiber glass, steel fiber and carbon nanotube. Polyurea as elastomer is an excellent water-proofing material with many mechanical characteristics such as high tensile strength, ductility, high rate of expansion and contraction, and so on. The reinforcing fibers can be utilized for improving the load-carrying capacity of concrete structures. The polyurea plays a role to improve the ductility and toughness. Composite polyurea takes the mechanical advantages of the fibers and the polyurea. The test variables include the type of reinforcing fiber, its spraying thickness, and its weight ratio contained in the composite polyurea. It is observed that the load-carrying capacity, and the ductility and toughness are improved with the increase in the spraying thickness and the weight ratio contained in the composite polyurea. It is expected that the composite polyurea can be widely utilized in enhancing the structural and seismic performance.

• 한국건설순환자원학회논문집
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• 제7권3호
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• pp.243-254
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• 2019

본 연구에서는 지금까지 공동주택 지하주차장 상부 슬래브에 적용하여 누수하자가 발생된 방수공법들의 문제점과 상부 슬래브의 특성을 고려한 요구조건을 검토하고, 이에 적합한 성능(안)을 선정하여 복합형 폴리우레아 공법을 대상으로 그 적합성 여부를 판단하고자 하였다. 검토결과, 공동주택 지하주차장 상부슬래브에는 (1) 균열 및 거동 대응성, (2) 바탕면 일체성, (3) 수직부 수밀 안정성, (4) 누름층 시공 용이성, (5) 충격 및 누름 대응성, (6) 차량 이동하중에 대한 대응성 등의 성능검토가 필요하겠다. 연질, 경질의 복합형 폴리우레아를 대상으로 요구조건에 해당하는 5가지 항목에 대한 평가를 진행한 결과 모두 조건에 부합하는 것으로 확인되었으며, 단일 공법으로 적용함에 있어 문제점이 있던 재료들을 복합화 함으로서 각 재료의 장단점을 보완하여 효과적으로 적용할 수 있음을 확인하였다. 단, 실제 현장에 적용하기 위해서는 향후 Mock-up 평가 등 현장 적용성에 대한 추가적인 평가가 이루어져야 할 것이며, 복합화에 따른 경제성 및 유지관리성 측면에서의 검토를 통해 실제 시장 적용성 여부에 대한 후속적인 연구가 필요하겠다.

• 한국응용과학기술학회지
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• 제7권1호
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• pp.31-36
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• 1990

Synthesizing octylphosphate(OTP) from phosphorus pentoxide with n-octyl alcohol, octylphosphatethiourea(OTPU) was prepared from OTP with thiourea. After flame retardant finishing OTPU to acrylic fabrics, nylon taffeta and tetron taffeta, the physical properties, such as tear strength and flame retardancy were measured. As the results of the measurement, OTPU was found to be a good flame retardant having softness using to synthetic fibers.

• 약학회지
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• 제60권2호
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• pp.78-84
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• 2016

N-Phenylthiourea derivatives and catechol oxidase receptor complex was studied using molecular mechanics method. The starting structure was adopted from the protein databank and the calculation of energy minimization and molecular dynamics was performed with AMBER package. The molecular dynamics showed that the simulation time span of 20 ns was long enough to observe the interaction profile and stationary ligand-receptor configuration in the complex. The conformation of the ligand was related to the interaction to the receptor and the efficacy was also interpreted in this context.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 C
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• pp.1766-1768
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• 2000

신장병 진단의 척도로 요소의 농도는 매우 중요하다. 요소의 농도를 측정하기 위한 센서개발이 본 연구의 목적이다. 기존의 Potentiometry법은 Nernst식이 적용된다는 가정하에 감도를 측정했다. 실험결과 전극상에서 우레아제의 요소 가수분해 반응은 Nernst식을 적용할 수 없는 비가역적인 반응으로 판단되어 센서의 감도 측정을 Linear sweep Voltammetry(LSV)법을 이용하였다. Voltammetry법은 가역적이든 비가역적이든 관계없이 Cottrell 식에 의한 전류와 농도의 직선관계로부터 감도를 측정할 수 있다는 장점이 있다. 센서 전극의 표면은 SEM으로 분석하였고, LSV 법으로 측정한 센서의 감도는 $34{\mu}A$/decade 였다.