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A6061-T6과 A5052-H32재의 이종 마찰교반용접시 핀 형상이 기계적 강도에 미치는 영향에 관한 연구
박희상,최원두,고준빈,이영호,신기석,김인철,최만용,Park, Hee-Sang,Choi, Won-Doo,Ko, Jun-Bin,Lee, Young-Ho,Shin, Ki-Seok,Kim, In-Chul,Choi, Man-Yong 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
Friction stir welding is a relatively new solid state joining process. A6061-T6 and A5052-H32 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile play a major role in deciding FSP zone formation in A6061-T6 and A5052-H32 aluminium alloy. Three different tool pin profiles have been used to fabricate the dissimilar butt joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.
A16061-T6 마찰교반용접시 핀 형상과 이송속도가 기계적 강도에 미치는 영향에 관한 연구
박희상,이영호,최원두,고준빈,Park, Hee-Sang,Lee, Young-Ho,Choi, Won-Doo,Ko, Jun-Bin 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.4
Friction stir welding(FSW) is an relatively new solid state joining process. A1606l-T6 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process(FSP) uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile playa major role in deciding FSP zone formation in A16061-T6 aluminium alloy. Tow different tool pin profiles have been used to fabricate the joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.
실시간 운영체제 iRTOS™ 를 위한 메모리 관리 체계 설계 및 구현
박희상(Hi-Sang Park),안희중(Hee-Jung Ahn),김용희(Yong-Hee Kim),이철훈(Cheol-Hun Lee) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.1A
실시간 운영 체제(Real-Time Operating System)는 특정 태스크가 정해진 시간 안에 수행될 수 있도록 시간 결정성(Determinism)을 보장하는 운영 체제이다. 실시간 운영체제는 멀티태스킹(Multitasking) 및 ITC(InterTask Communication 혹은 IPC, InterProcess Communication)을 제공한다는 점에서는 일반 운영체제인 Unix™, Linux™, Windows™ 등과 같지만, 시간 결정성을 보장한다는 점에서 일반 운영 체제와 다르다. 또한 실시간 운영 체제를 포함한 임베디드 시스템(Embedded System)은 일반적으로 디지털 카메라, 디지털 TV, DVD 등에서 수행되므로 실행 이미지(Image) 크기가 작아야 한다. 본 논문에서는 실시간 운영체제의 실행 이미지를 줄이면서 시간 결정성을 보장할 수 있도록 메모리 관리 체계를 설계하고 구현한 내용을 설명한다.
박희상(Hee Sang Park),이상용(Sang Young Lee),김정석(Jeong Suk Kim),박익민(Ik Min Park) 한국주조공학회 2001 한국주조공학회지 Vol.21 No.6
N/A The machinability of cast iron is closely related to its microstructural property. In this study, the effect of graphite mophology and matrix microstructure on machinability in several commercial cast irons (GC 25, GCD 45, GCD 50, GCD 70, GCD HSMo, GCMP) was investigated. To estimate the machinability, turning test was carried out under conditions of spindle speed 80m/min depth of cut 0.25㎜, feed 0.16㎜/rev and cutting distance 1km. Thrust force in turning test decreases in the order of GCMP, GCD 70, GCD 50, GC 25, GCD 45 and GCD HSMo. i.e. machinability increases in this order. The superior machinability of GC 25 is caused by flake type graphite which acts as chip braker and provides lubrication during machining. Consequently, soft ferritic cast irons exhibit superior machinability compared with pearlitic cast irons.
Al6061-T6 마찰교반용접시 핀 형상과 이송속도가 기계적 강도에 미치는 영향에 관한 연구
박희상(Hee Sang Park),이영호(Young Ho Lee),최원두(Won Doo Choi),고준빈(Jun Bin Ko) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.4
Friction stir welding(FSW) is an relatively new solid state joining process. Al6061-T6 aluminium alloy has gathered wide acceptance in the fabrication of light weight structures requiring a high strength to weight ratio and good corrosion resistance. This friction stir process(FSP) uses a non-consumable tool to generate frictional heat in the abutting surfaces. The welding parameters such as tool rotational speed, welding speed, etc., and tool pin profile playa major role in deciding FSP zone formation in Al6061-T6 aluminium alloy. Tow different tool pin profiles have been used to fabricate the joints. The formation of friction stir processed zone has been analysed macroscopically. Tensile properties of the joints have been evaluated and correlated with the friction stir processed zone formation.
박희상(Park, Hee Sang) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
In order to meet Federal Motor Vehicle Safety Standard (FMVSS) 201 energy absorbing parts are used. This paper presents a method to obtain improved structural design to help enhance occupant interior impact protection. Energy absorbing rib structure and bracket are used in this study with variable optimization.