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강민철 ( Min Cheol Kang ),곽수환 ( Soo Hwan Kwak ),김창수 ( Chang Soo Kim ) 한국정보시스템학회 2010 情報시스템硏究 Vol.19 No.4
The ubiquitous computing & technology is to make passive IT machinery as the smart-object to solve the problems of information management. These ubiquitous devices can be a concierge of humans lives. In addition, the ubiquitous computing & technology added with Pro-Active processing technology is the intellectual automatic process capacity that probably enhance quality of human`s life. Although the social influencing power of ubiquitous computing technology is so critical, research on the social impact of ubiquitous has been studied insufficiently. And, we also need the countermeasures to protect the societies from the side effect of the ubiquitous computing technology. The purpose of this research is to minimize the loss which comes from the new ubiquitous society, by presenting the technological and systematic alternatives and by researching the various side effects. This research suggests the proper alternatives by reviewing and by researching the adverse effects of the ubiquitous computing technology.
데이터베이스를 이용한 웹로봇 기반의 정보필터링 에이전트 시스템
강민철 ( Min-chul Kang ),신석철 ( Seok-cheol Shin ),정태선 ( Tae-sun Chung ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
인터넷은 방대한 정보의 집합체이다. 사용자들은 웹에서 자신이 원하는 정보를 검색하여 사용하고 있다. 하지만 웹은 워낙 방대한 정보를 보유하고 있고 사용자가 원하는 정보가 다양해질수록 이러한 정보를 찾는 것은 어려워질 수 있다. 많은 유저들이 서로 다른 기호를 가지고 있는 만큼, 사용자에 따라 다른 형태의 정보를 제공하는 것이 필요하다. 이러한 형태의 서비스를 제공하기 위해서는 다양한 프로그램들이 상호협력하는 것이 필요하다. 본 논문은 데이터베이스를 활용한 멀티 에이전트 시스템을 통하여 사용자가 원하는 정보를 쉽게 관리하고 찾는 것에 목적을 둔다.
용탄단조법에 의해 제조된 Mg-6Al-xZn(x=0 , 1 , 2) 합금의 용체화처리조건 규명
강민철,윤일성,김인배 ( Min Cheol Kang,Il Sung Yoon,In Bae Kim ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.4
This study has been investigated the influence of solid solution treatment on the microstructure of Mg-6Al-xZn(x=0, 1, 2) alloys fabricated by squeeze casting process. The products having clean surface and fine microstructure are fabricated by adopting the liquid metal forging method. The microstructures of as-fabricated state show β(Mg_(17)Al_(12)) precipitates between the dendrite boundaries. It is found that the hardness of the alloys is increased with increasing amount of zinc due to the solid solution hardening effect of zinc. In the changes of microstructure upon solid solution treatment time at 405℃, β phases are dissolved in α matrix up to 1hr and the microstructure are coarsened rapidly after 2hrs. The microhardness are decreased rapidly until lhr of solution treatment time and then stabilized. From the above results, it is concluded that the optimum solid solution treatment condition for Mg-6Al-xZn alloys is at 405℃ for 1hr. The solution treatment time is greatly reduced comparing to conventional casting(at 385∼418℃ for 10∼14hrs) due to the formation of the super-saturated solid solution by liquid metal forging.
강민철(Min-Cheol Kang),이원우(Won-Woo Lee),오재영(JaeYoung Oh),김현수(Hyun-Soo Kim),이효근(HyoGeun Lee),전유진(You-Jin Jeon) 한국해양바이오학회 2017 한국해양바이오학회지 Vol.9 No.2
Temperature is a major factor that affects the physiochemical properties of compounds. This study focus on the determination of thermostability and the effect of temperature on antioxidant activities of Ecklonia cava (E. cava) ethanoic extract. The ethanoic extracts of E. cava were evaluated at 30˚C, 60˚C and 90˚C for 0 to 7 days. The antioxidant activities were determined by DPPH, hydroxyl radical and hydrogen peroxide scavenging activities. The intracellular reactive oxygen species (ROS) scavenging activity was investigated using DCFH-DA assay. Results revealed that the ethanoic extract of E. cava incubated at different temperatures for 0 to 7 days, showed stable scavenging activities on DPPH, hydroxyl radical and hydrogen peroxide. The ROS scavenging activities of ethanoic extract and ascorbic acid were also investigated. The extract showed a stable ROS scavenging activity from 0 to 7 day at 90˚C. However, the scavenging activity of ascorbic acid at 90˚C decreased starting from day 3. These results indicated that the antioxidant effects of this food grade ethanoic extract of E. cava could remain stable during the employed temperatures of food processing.
유럽지역의 마그네슘 합금의 자동차 부품적용 현황과 전망
강민철(Min Cheol Kang),손근용(Keun Yong Sohn) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Magnesium alloys have recently been considered as candidate materials for many automotive components in Europe and North America because of their high specific strength and stiffness with good damping capacity. With the growing environmental reinforcements, the magnesium alloys consumption in automobiles is projected to grow in next decade. Currently, many automobile makers in Europe including Volks Wagen and BMW use magnesium alloys for powertrain components, chassis, and suspension parts. In this paper, the applications of magnesium alloys to automobiles, the prospects of their consumption, and the demand and suppy of magnesium ingots in Europe have been reviewed.<br/>