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      • KCI등재

        자동차용 알루미늄 5185-폴리프로필렌 샌드위치 판재의 성형성

        김기주,정효태,손일선,김철웅,김중배,Kim, Kee-Joo,Jeong, Hyo-Tae,Sohn, Il-Seon,Kim, Cheol-Woong,Kim, Joong-Bae 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2

        The objective of this study was to develop formability evaluation techniques in order to apply aluminum sandwich panel for automotive body parts. For this purpose, newly adopting formability evaluation (using limit dome height and plane strain test) was carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum forming conditions of the aluminum sandwich panel. The results showed that there were good agreements between the old formability evaluation method and the new method which was more simplified than that of old one. From the results of these formability evaluation, the formability of sandwich panel was higher than that of aluminum alloy sheet alone which was the skin component for the sandwich panel. Also, it was found that sandwich panel could reduce the weight and could have the same flexural rigidity simultaneously when it was compared to the automotive steel sheet.

      • KCI등재

        初期 士林派의 정치적 좌절과 退溪學

        김기주(Kim Kee-joo) 한국양명학회 2009 陽明學 Vol.0 No.23

        이 논문의 목적은 퇴계학과 초기 사림파, 특히 사화기를 거치며 와해된 영남 사림파와의 관련성을 확인하는 데 있다. 누구도 쉽게 부정하지 못하듯 ‘퇴계학’의 등장은 조선성리학의 질적 전환을 불러온 하나의 학문적 사건이다. 이러한 학문적 사건이 도대체 어떻게 일어날 수 있었는가 하는 문제는 퇴계학의 성격에 대한 이해에 있어서 필수적이다. 본 논문에서는 이황의 생애와 중첩되면서도 영남사림파가 와해되어가는 사화기의 절정을 살다간 이현보, 이언적, 주세붕이 보여준 삶의 지향과 성리학에 대한 이해를 바탕으로 퇴계학의 형성배경을 확인하고 있다. 단순히 일상생활의 규범학으로 혹은 정치적 이념으로 이해되던 주자학을 언제부터 우주와 인간의 근원을 물어가는 철학으로 새롭게 이해하고 그것을 사회적으로 확산하기 위한 노력을 기울이기 시작했는지 묻는다면, 사화기를 지나며 초기 사림파가 겪은 정치적 좌절과 그것에 대한 반성이 주요한 전환점이 되었음을 알 수 있다. 그리고 이현보, 이언적, 주세붕은 바로 그러한 지향을 적극적으로 표명하였으며 퇴계학의 성립을 준비한 인물로 평가할 수 있다. The object of this paper is to study the relation between Toegye’s learning, early Sarim sect, and especially Yeongnam Sarim sect which had been collapsed over the Sahwa period. No one can easily deny that emergence of ‘Toegye’s learning’ was an academic event to bring qualitative change to Chosun’s Neo-confucianism. The problem of what made this academic event possible to happen is essential to understand the characteristic of Toegye’s learning. This paper shows the establishment background of Toegye theory based on the appreciation of Neo-confucianism and intention of life shown by Yi-Hyeonbo, Yi-eonjeok and Joo-Seboong, who lived when Yi-hwang was alive and also experienced the culmination of Sahwa period where the Yeongnam Sarim sect was collapsing. If you question when Neo-confucianism, which was simply considered as a study of daily life model or political ideology, started to be understood anew as the philosophy to discover the origins of cosmos and human kind, and get the attention and attempt for its social dissemination, you could see the political frustration and introspection about it that early Sarim sect had experienced during the Sahwa period became a significant turning point. And Yi-Hyeonbo, Yi-eonjeok and Joo-Seboong can be evaluated as the ones who declared their intention and prepared for the establishment of Toegye’s learning.

      • KCI등재
      • KCI등재

        컴퓨터 시뮬레이션(CAE)을 이용한 자동차용 리어 서브-프레임의 하이드로-포밍 공정 개발

        김기주(Kee Joo Kim),성창원(Chang-Won Sung),백영남(Young Nam Baik),이용헌(Yong Heon Lee),배대성(Dae Sung Bae),손일선(Ilseon Sohn) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.3

        The hydroforming technology has been spreaded dramatically in automotive industry last 10 years. Itmay cause many advantages to automotive applications in terms of better structural integrity of the parts, lower cost from fewer part count, material saving, weight reduction, lower springback, improved strength and durability and design flexibility. In this study, the whole process of rear sub-frame parts development by tube hydroforming using steel material having tensile strength of 440 ㎫ grade is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, preforming and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.

      • KCI등재

        컴퓨터 시뮬레이션(CAE)을 이용한 자동차용 엔진 크레들의 하이드로-포밍 공정 연구

        김기주(Kee Joo Kim),최병익(Byung-Ik Choi),성창원(Chang-Won Sung) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.1

        Recently, the use of tubes in the manufacturing of the automobile parts has increased and therefore many automotive manufactures have tried to use hydro-forming technology. The hydro-forming technology may cause many advantages to automotive applications in terms of better structural integrity of the parts, lower cost from fewer part count, material saving, weight reduction, lower spring-back, improved strength and durability and design flexibility. In this study, the whole process of front engine cradle (or front sub-frame) parts development by tube hydro-forming using steel material having tensile strength of 440 ㎫ grade is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydro-formability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape on automotive sub-frame by hydro-forming process were carefully investigated. Overall possibility of hydro-formable sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, preforming and hydro-forming. At the die design stage, all the components of prototyping tools are designed and interference with press is examined from the point of geometry and thinning.

      • KCI등재

        컴퓨터 시뮬레이션(CAE)을 이용한 자동차용 AA6061 리어 서브-프레임 사이드멤버의 하이드로-포밍 공정 개발

        김기주(Kee Joo Kim),김재현(Jaehyun Kim),최병익(Byung-Ik Choi) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.5

        The automotive industry has shown a growing interest in tube hydroforming during the past years. The advantages of hydroforming (less thinning, a more efficient manufacturing process, etc.) can, for instance, be combined with the high strength of extra high strength steels, which are usually less formable, to produce structural automotive components which exhibit lower weight and improved service performance. Design and production of tubular components require knowledge about tube material and forming behavior during hydroforming and how the hydroforming operation itself should be controlled. These issues are studied analytically in the present paper. In this study, the whole process of rear sub-frame parts development by tube hydroforming using AA6061 material is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Engineering) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable rear sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.

      • KCI등재

        차량 NVH개선 설계를 위한 샤시 구동계의 Driveline Test Bench 구성 및 CAE 해석

        김기주(Kee Joo Kim),주형준(Hyung Jun Ju),이용헌(Yong Heon Lee),배대성(Dae Sung Bae),성창원(Chang Won Sung),백영남(Young Nam Baik),손일선(Il-Seon Sohn) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.1

        The authors have investigated the NVH problems of drive system in full vehicle test. However it is difficult to define the NVH problems of driveline system. Since it is hard to measure the rotating part and it is vague that only the drive system induces the NVH problem. Vibration in a driveline is presented in this paper. In the experiment, the rear sub­frame and propeller shafts and axle were composed and mounted with rubber each other. For applying the vibration input instead of the torsional vibration effect of an engine, the shaker was taken. In particular, torsional vibration due to fluctuating forced vibration excitation across the joint between driveline and rear sub­frame was carefully examined. Accordingly, the joint response was checked from experiments and the FE­simulation using FRF (frequency response function) analysis was performed. All test results were signal processed and validated against numerical simulations. In present study, the new test bench for measuring the vibration signal and simulating the vehicle chassis system was proposed. The modal value and the mode shape of components were analyzed using the CAE model to identify the important components affecting driveline noise and vibration. It could be reached that the simplified test bench could be well established and be used for design guide and development of the vehicle chassis components.

      • KCI등재

        차량 엔진크레들용 크로스멤버 부품의 하이드로-포밍가공 및 해석

        김기주(Kee Joo Kim),이용헌(Yong Heon Lee),배대성(Dae Sung Bae),성창원(Chang Won Sung),백영남(Young Nam Baik),손일선(Il-Seon Sohn) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.2

        The environment and energy related problem has become one of the most important global issues in recent years. One of the most effective ways of improving the fuel efficiency of automobiles is the weight reduction. In order to obtain this goal the hydroforming technology has been adapting for the high strength steel and its application is being widened. In present study, the chassis components (mainly cross members of engine cradle) simulation and development by hydroforming technology to apply high strength steel having tensile strength of 440 ㎫ grade is studied. In the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydroformability in details. Overall possibility of hydroformable chassis parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, performing and hydroforming. In the die design stage, all the components of prototyping tool were designed and interference with press was investigated from the point of geometry and thinning.

      • KCI등재

        차량연비 향상을 위한 DLC 코팅 층이 엔진 마모특성에 미치는 영향

        김기주(Kee Joo Kim),유석종(Seok-Jong Yoo),최병익(Byung-Ik Choi) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.1

        Recently, as the matters of environmental pollution, the energy exhaustion and alternative energy source have become more important issues, around industrial countries and the effort to improve fuel consumption is progressed continuously for decrease of air pollution. In an effort to improve fuel consumption for passenger cars, the study of DLC (Diamond Like Carbon) coating which is widely known to good wear characteristics come to the forefront. Therefore, in present study, it was investigated to the influence of DLC coating layer for wear characteristics with the piston ring material and then suggested to the development process for advanced automotive engine parts that showed improved wear characteristics. From these results, Finally, it will be contributed to improve the fuel consumption for passenger vehicles.

      • KCI등재

        보론강을 이용한 리어 범퍼 임팩트빔의 경량 설계 및 해석

        김기주(Kee Joo Kim),한창평(Chang Pyung Han),임종한(Jong Han Lim),이영숙(Young-Suk Lee),원시태(Si-Tae Won),이재웅(Jae-Woong Lee) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.2

        Increasing the fuel economy has been an inevitable issue for the development of new cars, and one of the important measures to improve the fuel economy is to decrease the vehicle weight. In order to obtain this goal, the researches about lighter, stronger and the well impact absorbing bumper impact beam have been studied without sacrificing bumper safety. In this study, the overall weight reduction possibility of rear bumper impact beam could be examined based on the variation of frontal, offset and corner impact crash capability by substituting a ultra high strength steel material (boron steel) having tensile strength of 1.5 ㎬ grade instead of conventional steels. In addition, the section variations (open section, closed section, open section with 5 stays) of the bumper impact beam structure were examined carefully. It could be reached that this analysis could be well established and be contributed for design guide and the optimum design conditions of the automotive rear bumper impact beam development.

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