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바이오 기반 폴리머가 포함된 블렌드의 상압 및 가압 발포 연구
한동훈,김영민,이단비,손성호,서건희,김한성,Dong-Hun Han,Young-Min Kim,Danbi Lee,Seongho Son,Geon-hee Seo,Hanseong Kim 한국복합재료학회 2023 Composites research Vol.36 No.5
There are several methods for shaping foams, but the most commonly used methods involve the use of resin mixed with a foaming agent, which is then foamed under high temperature and pressure in the case of compression foaming, or foamed under high temperature without applying pressure in the case of atmospheric foaming. The polymers used for foaming require design and analysis of optimal foaming conditions in order to achieve foaming under ambient pressure. Environmentally friendly bio-based polymers face challenges when it comes to foaming on their own, which has led to ongoing research in blending them with resins capable of traditional foam production. This study investigates changes in the characteristics of bio-based polymer-EVA blend foams based on variations in the content of bio-based polymers and explores the optimal foaming conditions according to crosslinking. The correlation between foaming characteristics and mechanical properties of the foams was examined. Through this research, we gained insights into how the content of bio-based polymers affects the properties of foams containing bio-based polymers and identified differences between ambient pressure and high-pressure foaming processes. Additionally, the feasibility of commercializing bio-based polymer-EVA composite foams was confirmed.
한동훈,안명석,이광열,오병삼,강문구,Han, Dong-Hun,Ahn, Myung-Seog,Lee, Kwang-Yeol,Oh, Byung-Sam,Kang, Moon-Gu 한국터널지하공간학회 2003 터널기술 Vol.5 No.3
터널 발파에 있어서 진동특성을 규명하기 위하여 브이-컷 심발패턴으로 시험발파를 수행하고, '터널 진행방향'과 '터널 진행직각방향'의 두 방향에서 발파진동을 계측하였다. 최대 지발당 장약량을 기준으로 지반의 진동전달 특성을 확인하기 위하여 자승근 환산거리와 삼승근 환산거리로 회귀분석을 수행한 결과 5mm/sec에서 교차점은 35~45m였으며 터널 진행방향에서 측정한 경우가 터널진행직각방향에서 측정한 경우보다 진동수준과 진동감쇠가 더욱 크게 나타났으며, 근거리에서 이루어지는 터널발파의 경우 삼승근 환산거리 방식으로 설계하는 것이 더욱 바람직하였다. 또한 발파가 없었던 시기에 사전균열조사결과에서는 미소량의 균열이 진행되고 있었으며, 공사기간중 균열조사 결과는 옥외구조물의 균열허용기준치 0.33mm대비 51.5~81.8%였다. Tunnel blasting has been performed with V-cut to investigate the characteristics. Blasting vibrations were measured at two directions, the proceed direction and side direction. Propagation characteristics were determined by regression analysis; square root scaled distance and cube root scaled distance with maximum charge per delay of the blast. Testing result, The cross point was 62m in the allowable vibration velocity of 3mm/sec and 46m in 5mm/sec. Also, vibration level with measuring point was highest and decayed fastest, adapting to cube root scaled distance, for the proceed direction on ground.
U-City 서비스 수용에 영향을 미치는 요인에 관한 연구
한동훈(Dong Hun Han),김광수(Kwang Soo Kim),임춘성(Choon Seong Leem) 한국전자거래학회 2014 한국전자거래학회지 Vol.19 No.2
유비쿼터스 도시(이하 U-City)는 ICT 기술을 활용하여 도심화의 문제를 해결하는 새로운 패러다임으로 각광받고 있다. 하지만 수익 창출 저하 및 시민체감형 서비스의 부족 등의 문제로 인해 U-City 서비스의 인식은 부정적인 수준에 머무르고 있다. 따라서 사용자 중심의 수익창출형 서비스 개발을 위한 연구가 필요하다. 본 연구는 U-City 서비스 개발을 위한 기반연구로서 U-City에 생활하는 시민들은 어떠한 요인에 의해 U-City 서비스를 수용하는지에 대해 도출해보고자 한다. 연구의 기본모델로는 새로운 기술수용 연구에 일반적으로 사용되는 기술수용모델을 활용하였다. 기술수용모델의 변수들은 U-City의 특성을 반영하여 사용자, 기술, 서비스 관점으로 나눠 설계하였다. 실제 U-City 선정 지역 중 7개 도시의 600명 시민을 대상으로 설문조사를 실시하였으며, 가설을 검증하기 위해 구조방정식 모델을 사용하였다. 연구결과의 주요 내용들을 이론적인 측면과 실용적인 측면으로 나눠 시사점을 제시하였으며, 향후 U-City 서비스 설계시 기반 연구로써 활용될 수 있을 것으로 사료된다. Ubiquitous City(U-City) is spotlighted for the new paradigm to solve the problem of urbanization using ICT technology. However, due to the lower profit and the insufficient of citizen-experience service, ubiquitous service(U-Service) is perceived negatively. In this sense, a study for user-centric profitable service development is needed. This study, as a basic research for the development of U-service, is conducted to identify the factors which are affected to acceptance of the U-Service. Technology Acceptance Model is applied for the basic model of the research. The model is modified by the U-City characteristic which has user, technology, and service perspective. The proposed model is empirically tested using survey data collected from 600 citizens of 7 U-City. Structural equation modeling is employed to test the research hypotheses. The survey analysis results are able to apply for basic research of U-Service design, and provide theoretical and practical implications.
윈드터빈 자연환기 장치의 외기풍속 및 온도차에 따른 환기특성에 관한 실험연구
한동훈(Dong-Hun Han),김영식(Yeong-Sik Kim),정한식(Hanshik Chung),정효민(Hyomin Jeong),최순호(Soon-Ho Choi) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.4
With the improvement of living standards, the ventilation for the mitigation of indoor or outdoor air-pollution problems has recently attracted a lot of attention. Consequently, the ventilation for the supply of outdoor fresh air into a room is treated as an important building-design factor. The ventilation is generally divided into the forced and natural types; here, the former can control the ventilation rate by using mechanical devices, but it has the disadvantages of the equipment costs, maintenance costs, and noise generation, while the latter is applied to most workshops due to the absence of noise and the low installation and maintenance costs. In this experimental study, the ventilation performance of a typical rotating-type natural ventilator, which is called a “wind turbine,” was investigated with the outdoor-wind velocity and the indoor/outdoor-temperature difference. From the experiment results, it was confirmed that the temperature difference of 10℃ corresponds to the ventilation driving force with an outdoor-wind velocity of 1.0 m/s. Additionally, the intake-opening area of a building also exerts a great effect on the ventilation rates.
직업군인의 자아실현과 공공서비스동기가 개인성과에 미치는 영향에 관한 소고
한동훈 ( Han Dong Hun ),김민석 ( Kim Min Sug ) 공군사관학교 2017 空士論文集 Vol.68 No.1
A career soldier prestives the public interest over private interests of occupational consciousness, responsibility and collectivity base on professionalism. Research on incentives for public servants continues to be carried out, but career soldier is insufficient. The purpose of this study is to derive the theoretical and policy proposal, especially focusing on military organization by proving the effects of Self Actualization(SA) and Public Service Motivation(PSM) on individual performance. For this purpose, the study model to analyze the relations between SA and PSM of individual performance is set up and hypothesis is verified through questionnaire analysis. In terms of measurement tool, applied in this study PSM is derived from Min(1986), Kim et al.(2013) and individual performance is developed by researcher. The theoretical model was testified with date collected from 355(officer 75, warrant officer &sergeant 280) career solders. Research suggests that SA and PSM have a significant effect on individual performance. Based on the result of this study, some theoretical and policy implications are introduced. Research attempted to gain access to SA and PSM for career soldier and a new concept was established based on individual performance as the result of the empirical analysis.
한동훈(Han, Dong-Hun) 한국화재소방학회 2011 한국화재소방학회 학술대회 논문집 Vol.2011 No.춘계
화재현장에서는 화재의 원인으로 간주되는 여러 가지 증거물이 발생한다. 이러한 증거물을 분석하기 위한 수단으로 GC/MS의 역할은 아주 크며, 이를 이용한 증거물의 분석에 관한 표준으로 ASTM 1618-10과 전처리법을 소개한다. 또한 전처리법에 따른 여러 가지 종류의 유류의 특성을 알아보고 유류 성분을 포함한 화재증거물의 실제 사례를 들어 보겠다. 아울러 화재현장에서의 가연물로 추정되는 물질에 대하여 열분해를 통한 GC/MS 분석 사례도 제시하여 본다.