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음이온교환수지 혼입 시멘트 모르타르의 압축강도에 관한 실험적 연구
정도현 ( Jeongf Do-hyun ),이윤수 ( Lee Yun-su ),이한승 ( Lee Han-seung ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.1
Reinforced concrete is a building material that is generally used in modern society. Securing the performance of reinforced concrete is directly connected to the durability and longevity of the building. One of the major factors that deteriorate the durability of concrete is harmful ion. Recently, the quality and improvement method of reinforced concrete for penetration of harmful ion has been studied. In this study, the bead type ion exchange resin is substituted for 0%, 3%, and 6% of the fine aggregate volume in the mortar. The speciments underwent underwater curing and were checked for compressive strengths of 3 days and 28 days. From the results of compressive strength, it can be seen that the higher the substitution ratio of the ion exchange resin, the lower the early strength and long-term strength development, especially the early strength development.
수종 생약에 의한 Lens Aldose Reductase의 억제
정도래,박웅양,이승호,이경순,노재섭,Jeong, Do-Rae,Park, Woong-Yang,Lee, Seung-Ho,Lee, Kyong-Soon,Ro, Jai-Seup 한국생약학회 1993 생약학회지 Vol.24 No.1
To search for inhibitory activities for lens aldose reductase, twenty two medicinal plants were tested by the method of bovine lens aldose reductase inhibition test. In this test Rubia akane(68%), Artemisia selengensis(61%), Lespedeza cuneata (58%), Ligustrum lucidum(58%), Viola patrinii(58%) extracts were shown to have aldose reductase inhibitory activity. From the radix of Rubia akane, $2-methyl-1,\;3,\;6-trihydroxy-9,\;10-anthraquinone-3-O-(6'-O-acetyl)-{\alpha}-rhamnosyl-(1{\rightarrow}2)-{\beta}-D-glucoside$ was isolated and the $IC_{50}$ of this compound in the aldose reductase inhibition test was about $1.2{\times}10^{-6}M$.
미분말 음이온교환수지를 이용한 모르타르의 염소이온 고정 능력에 대한 실험적 연구
정도현 ( Jung Do Hyun ),이윤수 ( Lee Yun Su ),이한승 ( Lee Han Seung ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
When the reinforced concrete structure is in a high salinity environment, chlorine ions penetrate from the surroundings, resulting in corrosion of the reinforcing bars, resulting in low durability. Therefore, studies on the immobilization of chlorine ions are underway, and anion exchange resin, one of them, was used in this study. In this study, chloride ion fixing ability was confirmed by replacing OPC, conventional bead anion exchange resin, and powder anion exchange resin with mortar and then using an electron probe X-ray micro-analyzer. The bead anion exchange resin replaced 3% of the fine aggregate volume and the powder anion exchange resin 5% of the cement volume. The fabricated specimens were cured for 28 days, immersed in NaCl solution for 28 days, and confirmed by electron probe X-ray micro-analyzer.
음이온교환수지 혼입 시멘트 모르타르의 압축강도 및 염소이온 침투 저항성에 관한 실험적 연구
정도현 ( Jung Do-hyun ),이윤수 ( Lee Yun-su ),이한승 ( Lee Han-seung ) 한국건축시공학회 2018 한국건축시공학회 학술발표대회 논문집 Vol.18 No.2
Reinforced concrete is a building material that is generally used in modern society. Also, reinforced concrete structures in high salinity environments have low durability due to corrosion of reinforcing bars due to infiltrated chlorine ions. Anion exchange resins have an ability to immobilize chlorine ions in the resin while releasing their anions. As a material, it has already been shown that it is possible to fix the chloride ion inside the cementitious material through the cement mortar experiment. The purpose of this study is to confirm the compressive strength of cement mortar using powdered anion exchange resin after powdering an anion exchange resin. In order to confirm the chloride ion fixation ability of the powder anion exchange resin, chlorine ion penetration resistance test was carried out.
Inactivation of Spinach Glycolate Oxidase by Arginine-Specific Reagents
이건국,최정도,Lee, Kun-Kook,Choi, Jung-Do 생화학분자생물학회 1986 한국생화학회지 Vol.19 No.1
시금치잎으로 부터 분리한 glycolate oxidase는 arginine과 선택적으로 반응하는 시약, phenylgnyoxal이나 2,3-butanedione에 의해 비활성화 되었다. Phenylglyoxal에 의한 결손효소(apoenzyme)나 전효소(holoenzyme)의 비활성화 반응은 유사일차반응이고, 변형제 농도에 대해서는 일차이다. 기질의 경쟁적 저해제 oxalic acid나 oxalacetic acid는 전효소의 비활성화에 대해서는 효과적으로 방어하지만 결손효소의 비활성화에 대해서는 효과를 나타내지 않았다. 저해제에 의한 방어의 정도는 저해제의 농도와 상관관계가 있었다. 조효소에 FMN의 결합에 의해 효소의 비활성화 속도는 3배 정도 증가하였으며, 이러한 결과는 결손효소가 전효소로 변형될때 기질의 결합에 필요한 arginine이 노출되기 때문인 것으로 추측된다. Glycolate oxidase는 butanedione에 의해 비활성화 되었으며, borate는 비활성화 속도를 촉진시키는 효과를 보여 주었다. Butanedione에 의한 비활성화 반응은 과량의 butanedione과 borate를 제거함으로 효소의 활성이 재생되는 가역적 반응이였다. 이러한 실험결과로부터, arginine은 기질의 결합에 필수적이며, 기질의 음이온 카르복실기의 결합 부위로서 역할을 하는 것으로 생각된다. Glycolate oxidase from spinach is inactivated by arginine-specific reagents, phenylglyoxal and 2,3-butanedione. Inactivation of both apo- and holoenzyme by phenylglyoxal follows pseudo-first-order kinetics and first order with respect to modifier. The substrate-competitive-inhibitors oxalic acid and oxalacetic acid provide protection against inactivation of the holoenzyme but have no significant effect on the inactivation of apoenzyme. The extent of protection is related to the concentration of inhibitor. Binding of coenzyme flavin mononucleotide increase the rate of inactivation 3-fold by probably exposing an arginyl residue essential for substrate binding. The oxidase is also inactivated by 2,3-butanedione, and the rate of inactivation is related to the concentration of borate in solution. Inactivation of the oxidase by butanedione is reversible on removal of excess butanedione and borate. These data provide evidence of essential role of an arginyl residue in the binding of substrate. as a binding site for negatively charged carboxylate group of the substrate.
음이온교환수지 분말이 치환된 포틀랜드 시멘트 모르타르의 염소이온 침투 특성
이윤수 ( Lee Yun-su ),임승민 ( Lim Seung-min ),박장현 ( Park Jang-hyun ),정도현 ( Jung Do-hyun ),이한승 ( Lee Han-seung ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.1
외부로부터 시멘트 복합체 내부로 침투되는 염소이온은 주로 농도차로 인한 확산을 통해 이동한다. 확산하는 염소이온 중 일부는 일반적으로 내부 수화물과의 반응을 통해 고정되는데, 최근의 몇몇 연구는 음이온 교환 수지(AER) 분말이 혼입된 시멘트 복합체의 염소이온 침투 저항성 및 고정능력에 관한 연구결과를 보여주었다. 본 연구에서는 AER이 분쇄되는 과정에서 염소이온 흡착능력이 상실하는지를 확인하고자 한다. AER 분말의 염소이온 흡착능력은 증류수와 포화수산화칼슘 수용액 조건에서 분석되었고, AER 비드의 염소이온 흡착능력에 관한 기존의 연구결과와 비교되었다. 추가로, AER 분말이 포틀랜드 시멘트의 일부 치환된 모르타르의 압축강도 측정, 염소이온 확산계수 도출(NT Build 492 시험방법 이용), 염소이온 침투 프로파일링(전자현미분석 이용)을 수행하였다. 본 연구의 실험 결과는 분쇄과정으로 인한 AER 분말의 염소이온 흡착능력 저하가 거의 없음을 보여주었다. 그리고 AER 분말은 모르타르 내에서도 염소이온을 빠르게 흡착할 수 있었고, 시멘트 수화물보다 우수한 염소이온 흡착성능을 보여주었다. Chloride ion, which penetrates into the cement composites from the outside, generally diffuses by the concentration gradient. Chloride ions are adsorbed by the chemical reaction with cement hydrates. Recent studies have shown that anion exchange resin (AER) powder can effectively adsorb the chloride ion in the cement composites, and thus, the cement composites containing AER have a high chloride adsorption capacity and a good resistance for chloride penetration. In this study, the chloride adsorption ability of the AER powder was investigated under the conditions of distilled water and calcium hydroxide saturated solution to determine if the AER powder is less effective to increase the chloride adsorption ability after grinding process. The chloride adsorption ability of AER powder was compared with the previous research about the chloride adsorption of AER bead. In addition, the compressive strength, chloride diffusion coefficient (using NT Build 492 method), and the chloride profile of cement mortar substituted with AER powder were investigated. There was no decrease in the chloride adsorption capacity of AER powder but increase in the kinetic property for chloride adsorption after the grinding process. The AER powder could absorb the chloride ion in the mortar quickly, and showed better chloride ion adsorption ability than the cement hydrates.
이미정 ( Lee Mi Jeong ),송호경 ( Song Ho Gyeong ),이준우 ( Lee Jun U ),전권석 ( Jeon Gwon Seog ),김효정 ( Kim Hyo Jeong ),정도현 ( Jeong Do Hyeon ) 한국산림과학회 2003 한국산림과학회지 Vol.92 No.4
This study was carried out to select proper species for early stage replantation in forest road cut-slope. From one to fifteen year elapsed forest roads in four regional areas of Chungchung-do, sample plots were selected, and their vegetations and environmental factors were investigated. Invaded species with high frequency ordered Lespedeza bicolor, Rubus crataegifolius, Pueraria thunbergiana, Lysimachia clethroides, Pinus densiflora, Youngia denticulata, Patrinia villosa, and Spodiopogon sibiricus. North cut-slope have the highest value of invaded species number and plant coverage, and so, north aspect cuould be best for plant invasion. According to ordination, distribution of species was influenced by elapsed year and cut-slope aspect. Dactylis glomerata, Eragrostis curvula, Lespedeza bicolor, Lespedeza cuneate, Amorpha fruticosa, Patrinia scabiosaefolia, Artemisia princeps var. orienfalis, Miscanthus sinensis, and Pinus densiflora were considered as proper species for replantation at south slope. Lolium perenne, Dactylis glomerata, Eragrostis curvula, Lespedeza bicolor, Lespedeza cuneata, Amorpha fruticosa, Pueraria thunbergiana, Carex humitis, Patrinia scabiosaefolia, Artemisia princeps var. orientalis, Artemisia keiskeana, Clematis apiifolia, Zanthoxylum schinifolium, Rhus chinensis, Rubus crataegifolius, Rhododendron mucronulatum, Weigela subsessilis, and Pinus densiflora were considered as proper species for replantation at north slope. Sowing herbs(Eragrostis curvula, Lolium perenne, Dactylis glomerata) that were seeded in early stage have changed into invasive herbs, parachute shrubs, and gravitative trees. Naturalized plants(Eragrostis curvula, Dactylis glomerata) that were seeded excessively in early stage have disturbed ecological succession in forest road cut-slope.