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CNT강화 알루미늄 나노복합재의 자동차용 부품 적용성 연구
민병호 ( Byung Ho Min ),남동훈 ( Dong Hoon Nam ),박훈모 ( Hoon Mo Park ),이경문 ( Kyung Moon Lee ),이종국 ( Jong Kook Lee ) 한국복합재료학회 2015 Composites research Vol.28 No.4
CNT(carbon nanotubes) 강화 알루미늄 나노복합재는 우수한 기계적 특성으로 자동차용 차세대 경량재료로 주목을 받고 있으나 소재 제조 과정에 있어 CNT의 균일 분산 확보가 어렵고 대량제조 공정 확립이 어려워 자동차 부품으로의 적용이 어렵다. 그러나 점차 CNT 생산이 대량화 되고 있고 복합재로서의 특성이 개선되고 있다. 따라서 본 연구는 CNT강화 알루미늄 나노복합재의 현 수준을 확인하고 자동차 부품 관점에서의 적용가능성을 검토하고자 하였다. 평가에 사용된 소재는 20L급 High energy milling기에서 알루미늄 분말과 CNT를 혼합한후, 소결 및 압출하여 봉상(ø80)으로 제조되었다. 소재 관점에서 기계적 특성 및 열적 특성을 분석하였으며, 부품적용성 관점에서는 현재 자동차 부품에 사용되는 소재와 그 소재가 사용되는 각 부품의 주요 요구 특성을 상대비교하였다. 고강성과 성형성이 요구되는 부품에 사용되는 상용소재(A390) 및 SiC/Al 복합재와 성형성 비교평가를 진행하였으며, 탄성계수를 측정하였다. 피로 내구 및 경량화가 요구되는 메인베어링캡 양산소재와의 내구성비교 평가를 실시하였다. 또한 고온 안정성이 요구되는 피스톤용 내열 소재와 열팽창계수 및 열화에 따른 강도저하를 비교 평가하였다. 구배가 큰 금형을 설계하여 단조 가공 후, 성형성(외관 crack 및 성형압 측정)을 비교하였으며, 내구성 평가를 위해 실제 부품인 H社 소형 엔진블록의 메인베어링 캡을 적용하여 일축 단품 피로 시험을진행하였다. 이를 통해 우수한 소재 특성을 확인하였고, 자동차 구조용 부품으로 적용이 가능함을 확인하였다. Various characteristics(thermal expansion, microstructure, etc.) and mechanical properties of CNTaluminum nano composites manufactured by volume production system were evaluated. Also, formability and durability were evaluated for potential applications in automotive parts, via compared with high-elasticity material (A390) and the current commercial product. As a result, this composite has excellent mechanical properties and formability, therefore, to verity its potential for application as light and high strength materials in automobile part.
민병호(Byung Ho Min),손대현(Dae Hyun Son) 한국호텔관광학회 2000 호텔관광연구 Vol.2 No.3
To attract tourists through festivals, Korean Government (Ministry of Culture and Tourism) have sponsored about 20 regional tourism festivals since 1996. For the purpose of enhancing service quality and customer satisfaction of these regional festivals and enjoying them together with people of the global village, Government-supported festivals must be galvanized and activated trough managing service quality. For those seeking to improve the quality festival, this study suggests that service quality perceptions are measurable. However, improved scales will need to be developed which are positive evaluations of a vast majority of those surveyed. This research has identified two potential gap in service quality that should be addressed. Ranging from a distinction of service quality (physical/process/societal quality) studied by Gronroos and Kolter to the frame of suppliers` internal marketing proposed by Albrecht and Zeithaml et al. was identified to back up theories. Futhermore, it was found that service quality is an antecedental variable of consumer satisfaction. Meanwhile, SERVPERF model by Cronin et al. for measuring performance of service quality was conducted in place of SERVQUAL and case studies was carried out to induce dimensions of festival service quality. Based on the study objectives, Gumsan Insam Festival and Gangjin Celadon Festival were chosen for population sampling and empirical analysis of which methodology was taken from factor analysis, t-test, multiple regression analysis, etc. The findings revealed that 28 dimensions of service quality consisting of 7 factors were derived and the highest perception gap between tourists and suppliers were vendors` services and quality of vendor` products. Findings also indicated that the factor of `contribution to regional development` strongly influenced the factors of `contents of program` and `convenience amenities` influentially affected tourist satisfaction. This research has significant meanings that firstly evaluation criteria of 28 dimensions for service quality of regional festival be developed, secondly societal quality be tried to measure festivals besides physical quality and process quality, thirdly, perception comparison of both tourist and supplier has been investigated instead of previous measurement form of `tourist satisfaction`.
RAW264.7세포주와 염증생쥐모델에서 항염증(抗炎症) 작용(作用)에 대한 행경홍화탕(行經紅花湯)의 효과(效果)
민병호 ( Byung Ho Min ),유동열 ( Dong Youl Yoo ) 대한한방부인과학회 2005 大韓韓方婦人科學會誌 Vol.18 No.4
Purpose: The Purpose of this research was to investigate the effects of Haingkyunghonghwatang(HKHHT) on anti-inflammatory effects. Methods: As for the parameters of inflammation, levels of several inflammatory cytokines and chemical mediators were determined in mouse lung fibroblast cells (mLFC) and RAW264.7 cells. Also, changes in pathological features by drug treatment were investigated in the in vivo edema-induced rats by carrageenin /arachidonic acid or in the colitis-induced mice by DSS treatment. Results: The cytotoxicity of HKHHT on mLFC and RAW264.7 cells wasn`t observed at 100, 50, 10, and 1㎍/㎖ of The treatments. IL-1β, IL-6 and NOS-II mRNA expression of RAW264.7 cells was inhibited by The treatments in a dose-dependent manner. HKHHT treatment of RAW264.7cells(HtRc) inhibited TNF-α and COX-2 mRNA expression. HtRc significantly inhibited IL-6 and NO production. HtRc inhibited ROS production. HKHHT inhibited rat`s paw edema induced by carrageenin or arachidonate treatment in all concentrations examined. The body weight and colon length of colitis-induced mice were recovered to a normal level by DSS treatment. Clinical disease levels were significantly improved compared to the control animals. HKHHT treatment of colitis-induced mice(HtCm) significantly increased hematological values such as WBC and RBC counts, Hgb and HCT levels, but decreased PLT values. HtCm decreased IL-6 and TNF-α production significantly HtCm significantly increased CD3+(T) cell counts. In contrast, HKHHT treatment decreased CD19+ B cell counts and CD3+/CD69+ significantly, and also decreased B/T ratio (%) though not significant. Conclusion: These results indicated that HKHHT could be used for treating diverse female diseases caused by the inflammation.
허현태(Heo.Hyun-Tae),민병호(Min.Byung-Ho),이현정(Lee.Hyun-Jung) 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1
This study deals with the relationships between place and activity in neighborhood environments. It aims to clarify the role of activities on place experiences. Focused interviews were performed of neighborhood children to identify their most meaningful places that they have in their day-to-day neighborhood lives. The meaning of places were also examined during the interviews. These interview results were analyzed in parallel with the observations of children's activities separately performed. This critical comparative analysis shows that place is spatially related to activity; Places are where activities are concentrated. In addition, activities in places are more environmentally dependent, coordinated, and patterned whereas those in other neighborhood spaces tend to be of transient and mobile natures. The study overall indicates that activity is a significant mode through which places and their meanings are formed and maintained.<br/> <br/>