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Kwon Jay-Hyun,Tutumluer Erol,Kim Min-Kwan Korean Society of Road Engineers 2006 한국도로학회논문집 Vol.8 No.2
The structural response and performance of a flexible pavement can be improved through the use of geogrids as base course reinforcement. Current ongoing research at the University of illinois has focused on the development of a geogrid base reinforcement mechanistic model for the analysis of reinforced pavements. This model is based on the finite element methodology and considers not only the nonlinear stress-dependent pavement foundation but also the isotropic and anisotropic behavior of base/subbase aggregates for predicting pavement critical responses. An axisymmetric finite element model was developed to employ a three-noded axisymmetric membrane element for modeling geogrid reinforcement. The soil/aggregate-geogrid interface was modeled by the three-noded membrane element and the neighboring six-noded no thickness interface elements. To validate the developed mechanistic model, the commercial finite element program $ABAQUS^{TM}$ was used to generate pavement responses as analysis results for simple cases with similar linear elastic material input properties. More sophisticated cases were then analyzed using the mechanistic model considering the nonlinear and anisotropic modulus property inputs in the base/subbase granular layers. This paper will describe the details of the developed mechanistic model and the effectiveness of geogrid reinforcement when used in different quality unbound aggregate base/subbase layers.
Klebsiella pneumoniae NFB-320이 생산하는 Pullulanase를 이용한 전분당화
권재민,박경호,백운화,배동훈,유주현 한국산업미생물학회 1994 한국미생물·생명공학회지 Vol.22 No.5
본 연구실에서 토양으로부터 분리한 질소고정균인 Klebsiella pneumoniae NFB-320이 생산하는 효소인 pullulanase를 glucoamylase와 함께 이용한 전분류의 당화에 대하여 연구하였다. Pullulanase 조효소액의 최적활성 pH와 온도는 각각 pH6.0, 60℃이었고, pH 안정성과 열안정성은 pH5.0-6.5, 40℃까지 안정하였다. 당화효소인 glucoamylase의 최적활성 pH와 온도는 각각 pH 6.0, 60℃이었고, pH 안정성과 열안정성은 pH 4.O~6.5, 40℃ 까지 안정성이 유지되었다. 가용성 전분의 당화에 pullulanase와 glucoamylase를 함께 이용했을 때 당화효소만을 사용한 경우보다 3.2% 정도 당화 수율이 증가하였고, pullulan의 당화에 두 효소를 함께 사용하므로서 pullulanase만을 이용한 경우에 비해 18배의 환원당을 얻었다. In order to convert starch to the fermentative sugar, the effect of pullulanase on the saccharification of starch and pullulanase was investigated. The optimum pH and temperature for the enzyme activity of the glucoamylase and the crude pullulanase from Klebsiella pneumoniae NFB-320 were shown to be identical as pH 6.0 and 60℃, respectively. The crude pullulanase was stable between pH 5.0∼6.5, and up to 40℃, whereas the glucoamylase was stable between pH 4.0∼6.5, and up to 40℃. When pullulanase and glucoamylase were engaged together in the sacchrification of starch, saccharification yield was increased by 3.2% than the yield obtained by glucoamylase, alone. And the two enzymes produced sugar from pullulan 18 times much higher than the single use of pullulanase.
A Study on the Relationship between Business Ethics and CRM
Jay In Oh,Hyunsik SEO,oh jun KWON,Choi Hyoung Sub,Lim Kyo Hyun,Yang Han Joo 한국로고스경영학회 2008 한국로고스경영학회 학술발표대회논문집 Vol.2008 No.5월
When corporations adopt and apply business ethics to the business practice, it has been known that there are several ethical issues, such as conflict of interest, fraud, and discrimination. While there are ethical issues in the Information Systems (IS) need to be settled, until now there have not been adequate methods or an empirical study to make an approach into those ethical issues. Therefore, the purpose of this paper is to find a method of applying business ethics strategies into the IS fields while identifying ethical issues in IS activities. Through an empirical study, this paper presents several results in the circumstance of corporations of which business ethical activities are high or low and CRM systems are adopted or not. In result, this paper concludes when corporations adopt CRM systems, they should also consider business ethical issues.
권용규(Kwon, Yong Kyu),김정현(Kim, Jeong Hyun),이지선(Lee, Jisun),권재현(Kwon, Jay Hyoun) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11
현재 측량장비 및 기술의 발달에 따라 작업규정의 개정이 진행되었다. 하지만 경사지 수준 측량 시 해당 작업규정을 적용하기에는 관측환경에 의한 한계가 존재하며 이는 왕복교차에 영향을 줄 수 있다. 이에 본 연구에서는 현재 도입되어 사용 중인 주요 디지털레벨을 조건별로 비교하여 경사지에서 최적의 수준측량 방법을 제시하고자 하였고, 그 결과 수준측량수행 시 고정점 설치를 최소화하는 경우 구간교차한계 및 전체오차한계 기준을 통과하는 결과를 확인할 수 있었다.
LEE, DO HYUN,CHOI, KYUNG-HA,CHO, JAE-WE,KIM, SO YOUNG,KWON, TAE RIN,CHOI, SUN YOUNG,CHOI, YOO MI,LEE, JAY,YOON, HO SANG,KIM, BEOM JOON UNKNOWN 2014 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.33 No.5
Application of growth factor mixtures has been used for wound healing and anti-wrinkles agents. The aim of this study was to evaluate the effect of recombinant growth factor mixtures (RGFM) on the expression of cell cycle regulatory proteins, type I collagen, and wound healing processes of acute animal wound models. The results showed that RGFM induced increased rates of cell proliferation and cell migration of human skin fibroblasts (HSF). In addition, expression of cyclin D1, cyclin E, cyclin-dependent kinase (Cdk)4, and Cdk2 proteins was markedly increased with a growth factor mixtures treatment in fibroblasts. Expression of type I collagen was also increased in growth factor mixtures-treated HSF. Moreover, growth factor mixtures-induced the upregulation of type I collagen was associated with the activation of Smad2/3. In the animal model, RGFM-treated mice showed accelerated wound closure, with the closure rate increasing as early as on day 7, as well as re-epithelization and reduced inflammatory cell infiltration than phosphate-buffered saline (PBS)-treated mice. In conclusion, the results indicated that RGFM has the potential to accelerate wound healing through the upregulation of type I collagen, which is partly mediated by activation of Smad2/3-dependent signaling pathway as well as cell cycle progression in HSF. The topical application of growth factor mixtures to acute and chronic skin wound may accelerate the epithelization process through these molecular mechanisms.
Analysis of chemical forms of heavy metals in contaminated soil by sequential extraction methods
Oh-Hyeok Kwon,유경근,정경배,Jay Hyun Park,최의규 한국자원공학회 2013 Geosystem engineering Vol.16 No.4
The samples collected from soils and sediments near the mouth of a river (samples A, B, and C), port (sample D), or shooting range (samples E and F) were investigated with Tessier’s sequential extraction method to design the remediation process for contaminated sites. This method was chosen to determine the chemical forms of heavy metal contaminants, which consists of five fractions such as ‘exchangeable’, ‘bound to carbonate’, ‘bound to oxide’, ‘bound to organic matter’, and ‘residue’. In the case of samples from sediments near the mouth of a river, zinc (Zn) distributes in the fractions ‘bound to oxide’ and ‘bound to organic matter’, while copper is observed in the fractions ‘bound to organic matter’ and ‘residue’, respectively. When the sample obtained from the sediment near a port was examined, most of Zn distributes in the fractions ‘bound to organic matter’ and ‘residue’. In sites E and F, lead, Zn, and copper distributed in the fractions ‘bound to carbonate’ and ‘bound to oxide’. On the basis of results, physical treatment followed by chemical leaching for sites A, B, and C, physical separation process for site D, and chemical treatment process for sites E and F would be required to remediate the contaminated sites.