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고분자 연료전지용 불소계 poly(arylene ether sulfone) 블록 공중합체 전해질막의 합성 및 특성연구
유민철(Yoo, Min-Chul),장봉준(Chang, Bong-Jun),김정훈(Kim, Jeong-Hoon),이수복(Lee, Soo-Bok),이용택(Lee, Yong-Taek) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.4
본 연구는 불소그룹을 함유한 술폰화된 아릴렌에테르계 블록 공중합체 고분자 전해질막의 제조 및 연료전지 특성에 관한 것이다. 이러한 불소그룹을 함유한 술폰화된 아랄렌에테르계 블록 공중합체를 제조하기 위하여 양말단에 불소계 비닐기를 가지면서, 고분자 전환시 상온에서 술폰화 가능한 biphenyl계 단량체와 술폰화가 불가능한 sulfonyl계 단량체를 각각 합성하였다. Biphenyl계 단량체로 부터 올리고머를 합성한 후 sulfonyl계 단량체와 열적 고리화 부가중합을 하여 다양한 몰조성을 갖는 일련의 perfluorocyclobutane(PFCB)기를 포함하는 블록 공중합체를 제조하였다. 제조된 블록 공중합체를 상온에서 술폰화제인 chlorosulfonic acid(CSA)를 이용하여 후술폰화시켜 강산 이온기인 sulfonic acid를 biphenyl계 올리고머 부분에 선택적으로 도입하였다. 이렇게 제조된 술폰화된 고분자를 제막한 후 연료전지 특성을 Nafion-115와 비교하였다. 술폰화가 되는 올리고머 블록의 비율 증가에 따라 이온교환능력 (IEC)이 증가하였고 , 그에 따른 팽윤도 역시 증가하는 것을 보였다. 술폰화된 고분자들은 건조 및 습윤 상태에서도 기계적 강도가 우수하였다. 최적화된 술폰화 블록 고분자(S-2) 를 대상으로 membrane electrolyte assembly(MEA) 를 제조하여 연료전지 초기성능을 측정한 결과 Nafion-112와 유사한 전기화학적 성능을 나타내었다.
BSR 성능 향상을 위한 인사이드벨트 웨더스트립 장착구조 개발
유민한(Ryu, Min Han),장기수,이상현(Lee, Sang Hyun),이재승(Lee, Jae Seung),최형식 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
HKMC producted cars have field claims when door glass up&down and press uprtrim cause noise. That noise is chronic customer complaints. So I need improve that noise claims. Insidebelt weatherstrip mounting structure is important element of the noise. This research paper purpose is improve noise between insidebelt and uprtrim. This research paper will analisis noise reasons and propose improved mounting structure and material about insidebelt. The new proposed mounting structure can be mass product.
이승훈(Seung hoon, Lee),최영근(Young geun Choi),이원섭(Won sup Lee),유희천(Hee cheon You),유민정(Min Jung Yu),고명환(Myoung Hwan Ko),박종관(Jong Kwan Park) 한국컴퓨터게임학회 2015 한국컴퓨터게임학회논문지 Vol.28 No.2
Since the conventional methods of physical therapy may decrease the motivation of a patient for rehabilitation due to repetitive, monotonous movement, a new physical therapy system inducing a motivation from the patient is needed. The present study is intended to develop a physical therapy serious game for enhancement of dynamic balance control. The balance control therapy game was developed by the following steps: (1) survey of existing balance control therapy systems, (2) analysis of balance control literature, (3) ideation and architecture planning of the balance control therapy game, and (4) implementation of the balance control therapy game. The proposed physical therapy serious game can provide better usability, satisfaction, clinical effectiveness for balance control than the conventional methods.
노루발풀 추출물의 in vitro에서의 항산화, 항염증 및 항히스타민 활성
유민정 ( Min Jeong Ryu ),이숙영 ( Sook Young Lee ),차영주 ( Young Ju Cha ) 한국미용학회 2012 한국미용학회지 Vol.18 No.3
Pyrola japonica in Chinese traditional medicine have been used as tonics, sedatives, analgesics against rheumatoid arthritis, hemostatics, and recently isolated anti-inflammatory agents from whole plants. We have investigated antioxidant effect of P. japonica extract using DPPH raidcal scavenging test, total polyphenol and flavonoid content assay, nitrite(NO) scavenging test in cell-free system. Also, antihistamine activity by β-hexosaminidase assay and anti-inflammatory effect by inhibition rate of NO production in RAW 264.7 cell was evaluated. Skin irritation test of the extracts was evaluated in accordance with the guidelines of patch test. Plant extracts were prepared by ethanol extraction method. DPPH raidcal scavenging activity of ethanol extract of P. japonica. was the highest in 400 μg/mL as 88.62±1.51% and increased in a concentration-dependent manner. Total polyphenol and total flavonoid content of the extract was 107.5±0.03 μg/mL and 50±0.01 μg/mL, respectively. The NO scavenging activity in cell-free system was the highest in 800 μg/mL as 42.13±2.72% and it was also increased in a concentration-dependent manner. P. japonica extract will not significantly affect cell viability of RBL-2H3 cell for β-hexosaminidase assay and RAW 264.7 cell for NO content assay at the concentration of 5~50 μg/mL. The inhibition of β-hexosaminidase release was respectively indicated as 15.5, 43.0, 56.4, 67.9% in 5, 10, 20, 50 μg/mL of extract and it was increased in a concentration-dependent manner. Anti-inflammatory activity by NO content measurement in RAW cell was the highest in 50 μg/mL (NO content of 5.7±0.5 μM/mL) of P. japonica extract and additionally it was concentration-dependent. The patch application performed in order to determine dermal irritation of the extract showed result of no dermal reaction that is safety on skin. These results suggest that P. japonica extract can use as a resource of natural cosmetic material for anti-oxidant, anti-inflammatory, anti-itching gradients, and also safety on skin.