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리튬이차전지 양극재인 유기라디칼 고분자의 산화법에 대한 연구
이일복(Il Bok Lee),김영훈(Young Hoon Kim),문지연(Ji Yeon Moon),이철위(Chul Wee Lee),김다은(Da Eun Kim),하경수(Kyoung Su Ha),이동현(Dong Hyun Lee),손형빈(Hyung Bin Son),윤성훈(Song Hun Yoon) 한국고분자학회 2014 폴리머 Vol.38 No.6
라디칼 고분자화 반응 후 산화법을 이용하여 나티트록실 라디칼 고분자를 제조하였다. 두 가지 방법으로 산화된 라디칼 고분자의 라디칼 농도를 electroparamagnetic resonance spectroscopy(EPR) 법과 UV-visible absorption (UV-vis)방법을 통하여 측정하고 이를 통해 과산화수소수-Na2WO4법으로 산화하였을 때 라디칼 농도가 97.6% 정도 높게 얻어짐을 확인하였다. 또한 UV-vis 법은 정량적인 분석이 어려우나 대략적인 라디칼 형성 정도를 평가하는데 유용함을 확인하였다. 제조된 유기라디칼 고분를 리튬이온전지 양극재로 적용한 결과 우수한 용량, 초기효율, 높은 속도 특성을 가짐을 알수 있었다. An organic radical polymer (ORP) was prepared by radical polymerization and following oxidation intonitroxyl radical. Two different oxidation methods were employed and their radical concentrations were measured usingelectroparamagnetic resonance spectroscopy (EPR) and UV-visible absorption (UV-vis) spectroscopy. From these measurements,H2O2-Na2WO4 oxidation method exhibited a complete oxidation, which resulted in 97.6% spin concentration. Also, it was revealed that convenient and cheap UV-vis measurement was useful for preliminary radical concentrationcomparison. After applied as a cathode material in lithium ion batteries, ORP electrode showed a high initial capacity(110 mAh g-1), a good initial efficiency (96%), a very high rate performance (70% charging during 1.2 min) and stablecycle performance.
Cross Hole Type 비 연삭 밀링 인서트의 가공특성에 관한 연구
김택수(Taeck-Su Kim),이상민(Sang-Min Lee),박휘근(Hwi-Keun Park),채승수(Seung-Su Chae),이충석(Choong-Seok Lee),손일복(Il-Bok Son),김학규(Hak-Kyu Kim),이종찬(Jong-Chan Lee) 한국생산제조학회 2008 한국생산제조시스템학회 학술발표대회 논문집 Vol.2008 No.10
This paper reports some experimental results on the machining performance of non-ground cross hole type milling inserts. Six kinds of milling inserts were manufactured without using grinding process. Machining experiments were carried out to compare the machining performance of non-ground inserts with that of ground ones. The experimental results indicate that the cutting forces and surface roughnesses of machined surface of both ground and non-ground inserts are comparable.
스위스 볼을 이용한 체간 안정화 운동과 코어 안정화 운동이 여성노인의 균형과 보행에 미치는 영향
최수희 ( Su Hee Choi ),임재헌 ( Jae Heon Lim ),조화영 ( Hwa Young Cho ),김일복 ( Il Bok Kim ),김모경 ( Mo Kyung Kim ),이현영 ( Hyun Young Lee ) 대한물리의학회 2012 대한물리의학회지 Vol.7 No.1
Purpose:The purpose of this study was to investigate the effects of trunk stabilization exercise using swiss ball and core stabilization exercise on balance and gait in elderly women. Methods:Subjects 19 elderly women were randomly divided by the swiss ball exercise group (n=10) and the core stabilization exercise group (n=9). In a period of 4 weeks, they took trunk stabilization exercise using swiss ball and core stabilization exercise for 60 minutes 3 times a week. Balance and gait were measured by Functional Reach Test (FRT), One Leg Stand Test with Open Eye (OLSTOE), One Leg Stand Test with Closed Eye (OLSTCE), Timed Up and Go Test (TUG) and 6 m Walking Test (6MWT). These tests were measured at before exercise, 4 weeks after exercise and after the follow-up period of 2 weeks. Results:As a result, in all measurement values there was no significant difference in two groups (p>.05). In FRT, TUG, OLSTOE and 6MWT before exercise and 4 weeks after exercise, there was significant difference in both of two groups (p<.05). Moreover, according to results from 4 weeks after exercise and after the follow-up period of 2 weeks, without any particular exercise, in FRT and 6MWT there was no significant difference (p>.05). Conclusion:These finding indicate that trunk stabilization exercise using swiss ball could improve balance and gait in elderly women. Accordingly, In this study trunk stabilization exercise using swiss ball and core stabilization exercise is judged to be used for elderly people with gait and balance problems to prevent hurts from fall.
Cross Hole Type 비 연삭 밀링 인서트의 가공특성에 관한 연구
김택수,이상민,박휘근,채승수,이충석,손일복,김학규,이종찬 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
This paper reports some experimental results on the machining performance of non-ground cross hole type milling inserts. Six kinds of milling inserts were manufactured without using grinding process. Machining experiments were carried out to compare the machining performance of non-ground inserts with that of ground ones. The experimental results indicate that the cutting forces and surface roughnesses of machined surface of both ground and non-ground inserts are comparable.