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미끄럼 방지 바닥 도료용 폴리프로필렌 수지의 화학적 분쇄에 관한 연구
김대인 ( D L Kim ),정화영 ( H Y Chung ),황석환 ( S H Hwang ),조익성 ( I S Cho ),윤경준 ( K J Youn ),조백수 ( B S Cho ),김광국 ( K K Kim ),윤강재 ( K J Yun ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.6
In this study, some experimental results of the peroxide-degradation process of polypropylene(PP) in a co-rotating twin-screw extruder to produce controlled rheology polypropylene(CRPP) are presented. The peroxide was dicumyl peroxide(DCP) and the concentration of DCP was in the range 0-0.3wt%. It was found that the rheological properties of PP change significantly during reactive extrusion. Melt fiow index(MFI) increased with DCP concentration. Intrinsic viscosity decreases with increasing DCP concentration. From dynamic rheological data, number ave-rage molecular weight(Mn), weight average molecular weight(Mn) and molecular weight distribution(MWD) were cal-culated. Results indicated that Mw decreases and MWD becomes narrower with increasing peroxide concentration. Especially, particle size distribution of CRPP decreases with increasing DCP concentration by chemical powdering process, and anti-slip floor paint, CRPP(DCP 0.2 wt%) powder by 10phr was friction coefficient 2.15μ, abrasion resis-tance 511.18%.
흥분독성 소뇌손상 백서모델에서 운동기술학습이 균형 및 협응력에 미치는 영향
김기도 ( Gi Do Kim ),민경옥 ( Kyung Ok Min ),심재환 ( Jae Hwan Shim ),정재영 ( Jae Young Jeong ),김용억 ( Young Eok Kim ),김경윤 ( Kyung Yoon Kim ),김계엽 ( Gye Yeop Kim ),심기철 ( Ki Cheol Sim ),김은정 ( Eun Jung Kim ),남기원 ( K 대한물리의학회 2010 대한물리의학회지 Vol.5 No.3
Purpose:This study is intended to examine the motor skill learning on balance and coordination in the cerebellar injured rats by 3AP. Methods:This study selected 60 Sprague-Dawley rats of 8 weeks. Experiment groups were divided into four groups and assigned 15 rats to each group. Group Ⅰ was a normal control group(induced by saline); Group Ⅱ was a experimental control group(cerebellar injured by 3AP); Group Ⅲ was a group of motor skill learning after cerebellar injured by 3AP; Group Ⅳ was a group of treadmill exercise after cerebellar injured by 3AP. In each group, motor performance test, histologic observations, synaptophysin expression and electron microscopy observation were analyzed. Results:In motor performance test, the outcome of group Ⅱ was significantly lower than the group Ⅲ, Ⅳ (especially group Ⅲ)(p<.001). In histological finding, the experimental groups were destroy of dendrities and nucleus of cerebellar neurons. Group Ⅲ, Ⅳ were decreased in degeneration of cerebellar neurons(especially group Ⅲ). In immunohistochemistric response of synaptophysin in cerebellar cortex, experimental groups were decreased than group Ⅰ. Group Ⅲ`s expression of synaptophysin was more increased than group Ⅱ, Ⅳ. In electron microscopy finding, the experimental groups were degenerated of Purkinje cell. Conclusion:These result suggest that improved motor performance by motor skill learning after harmaline induced is associated with dynamically altered expression of synaptophysin in cerebellar cortex and that is related with synaptic plasticity.
MOS-EMS연계활용을 위한 실시간 수요예측 프로그램 기능개선을 위한 방법론
김광인(K. I. Kim),김두중(D. J. Kim),김광철(K. C. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
정부의 배전분할 유보결정에 따라 전력거래소에서는 현행 발전경쟁시장의 효율성 향상을 위한 많은 사업을 추진하고 있다. 그중 우선적으로 추진하였던 사업이 도매전력시장을 대비해 구축한 시장운영시스템 (MOS;Market Operation System)을 현행 계통운영을 담당하고 있는 급전 자동화시스템(EMS;Energy Management System)과의 연계활용이다. 이는 시장운영시스템(MOS)에 내재되어 있는 최첨단 기능중에서 일부를 현행 전력시장에 적용함으로써 계통운영의 효율성 향상 뿐만아니라 계통운영기술을 선진화하는 것이다. 특히, 기존 급전시스템에 비해 가장 두드러지는 점은 발전기들에 대한 에너지 및 예비력 급전계획을 사전적으로 5분단위로 최적화하여 수립하고 이를 발전기들에게 송신함으로써 경제적이며 안정적인 전력계통운영을 가능하게 해 줄 수 있는 것이다. 이를 가능하게 하기위해서는 바로 정확한 미리 수요수준의 결정이 필수불가결한 요소이다. 따라서 본 논문에서는 MOS-EMS 연계활용에서의 실시간 수요예측의 중요성과 기존 제작사의 알고리즘과 국내 전력수요특성간의 불일치점 그리고 이를 해결하고자 모색했던 방안들에 대하여 설명하고자 한다.
대한소아외과학회 회원의 1995년도 진료현황 및 수련경력 설문조사
김우기,김상윤,김신곤,김인구,김재억,김종석,김현학,박귀원,박영식,박우현,박주섭,송영택,양정우,오수명,이두선,이명덕,이석구,이성철,장수일,정성은,정풍만,최금자,최순옥,허영수,황의호,Kim, W.K.,Kim, S.Y.,Kim, S.K.,Kim, I.K.,Kim, J.E.,Kim, C.S.,Kim, H.H.,Park, K.W.,Park, Y.S.,Park, W. 대한소아외과학회 1997 소아외과 Vol.3 No.1
To understand the current status of pediatric surgical practice of the members of the Korean Association of Pediatric Surgeons, a survey of the practice of the 31 members in both 1994 and 1995. Twenty five members(80%) representing 20 hospitals responded. An average of four hundred and seventy four cases pediatric surgical operations were performed at individual institution in 1995 with 40 newborn cases. Eighteen members(72%) are currently working at university hospital. Fourteen institutions(70%) are currently classified as tertiary by the health insurance agency. The majority(15 to 60%) of members are working in the metropolitan Seoul area, while five in Taegu area. Sixteen members reported having the title of department head/director. Four members reported occasional non-pediatric surgical practice. Nine members out of 20 reported having independent pediatric surgical out-patient clinic before the establishment of the association(1985). Eight out of 15 members reported being appointed chief of pediatric surgery before 1985. In 20 institutions, 34 full time physicians(27 members, reportedly) are working in pediatric surgery. In regarding to pediatric surgical training, 16 members(64%) received an average of 16 months of training abroad, 5 members trained at home and abroad, and 4 from only at home. There are no differences in length of training periods in these groups. Twenty one members received their basic pediatric surgical training before 1985, the year of inauguration of the association. Twelve members received post-pediatric surgery refresher courses averaging 11 months' duration, after 2-11 years. Thirteen participants of this study belongs to the founding members of the association.