감성공학 기술을 적용한 롤러코스터 게임용 모션 시뮬레이터 개발

오중석 ( Jung Seok Oh ),윤석준 ( Sug Joon Yoon ),신영기 ( Young Gi Shin ) 한국감성과학회 2001 추계학술대회 Vol.2001 No.-

대다수의 컴퓨터 게임기들을 거의 예외없이 단지 게임 개발자들이나 일부 전문 게이머들의 경험에 의존하여 사용자의 감성적 특성을 반영하고 있을 뿐이다. 본 연구개발에서 시도되고 있는 게임기는 모션이 가미된 콘솔형 아케이드 시뮬레이션 게임기에 해당되는데, 감성공학 DB와 제시기술을 적용함으로써 게임의 흥미를 극대화하고자 하였다. 총 2차년의 개발기간중 1차년도에는 롤러코스터의 운동을 해석하였으며, 실시간 스케쥴러와 H/W 입출력 및 통신 드라이버에 대한 개발을 수행하였고, 사용자가 직접 트랙을 설계할 수 있는 저작도구와 영상 기반 렌더링 모듈을 개발하였다. 차후 연구될 방향은 게임기의 감성을 평가할 수 있는 표본 집단을 선발하여 게임기에 시승시킨 후 설문지 답변과 시승시 측정되는 생리신호를 추출하여 비교 분석한 후 게임기를 감성친화적으로 개선하는 것이다.

Gimbal형 롤러코스터 모션 시뮬레이터 설계에의 감성공학 적용

오중석 ( Jung Seok Oh ),안재준 ( Jae Joon Ahn ),신영기 ( Young Gi Shin ) 한국감성과학회 2002 춘계학술대회 Vol.2002 No.-

현재 대부분의 시뮬레이터는 6개의 축으로 대상체의 운동자유도를 모사하는 모션 시스템을 사용하고 있다. 본 연구개발에서 개발되어지고 있는 시뮬레이터는 일반적인 Stewart 형식이 아닌 운동 대상체의 운동자유도를 짐발(Gimbal)형으로 재현하고자 하였다 이를 위해 실시간 스케줄러와 H/W 입출력 및 통신 드라이버에 대한 개발을 수행하였고, 시뮬레이션에 적합한 정확도와 실시간성을 유지하도록 롤러코스터 상에서 이루어지는 차량운동을 모델링 하였다. 또한 인간감성의 절용을 고려한 짐발형 모션 시스템의 운동 재현을 위해 워시아웃(Washout) 알고리즘을 개발하였다. 특히, 짐발형 모션 시스템은 그 연구 사례를 찾기 힘든 것으로 운동 모사성의 객관적 검증과 탑승자에 대한 시뮬레이터의 영향을 평가하기 위해 감성평가를 실시하였다. 감성평가를 위해 평가지에 의한 주관적 평가 방법과 탑승자의 생리신호를 측정하는 객관적 평가방법을 사용하였다.

마찰 용접을 이용한 선박용 2 행정 기관용 배기밸브 스핀들의 개발 및 적용

오중석(Jung-Seok Oh),한명섭(Myoung-Seoup Han),박희천(Hee-Cheon Park),정호승(Ho-Seung Jeong),조종래(Jong-Rae Cho) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-

나이모닉 일체형으로 사용되고 있는 선박용 2 행정 저속엔진의 배기밸브 스핀들을 고온, 고압, 배기가스 및 반복 충격 하중에 노출된 스핀들의 Head부분은 기존의 나이모닉 소재를 적용, 기존 재질의 우수한 성질을 유지하고 설계적으로 나이모닉 소재의 적용이 불필요한 Stem부는 오스텐나이트 계열의 SNCrW 소재를 사용하여 관성마찰 용접 방식으로 접합하여 제품을 제작하고, 접합부의 미세조직 관찰, 성분분석, 인장, 경도, 피로시험 등의 기계적, 금속적 특성평가를 통해 마찰용접제품에 대한 신뢰성을 확인하고 양산 생산을 위한 기술적 토대를 마련하였다.

이종재료 마찰용접에 의한 초내열합금 대형 배기밸브 스핀들 개발

박희천,정호승,조종래,이낙규,오중석,한명섭,Park Hee-Cheon,Jeong Ho-Seung,Cho Jong-Rac,Lee Nak-Kyu,Oh Jung-Seok,Han Mvoung-Seoup 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.8

Inertia welding is a solid-state welding process in which butt welds in materials are made in bar and in ring form at the joint race, and energy required lot welding is obtained from a rotating flywheel. The stored energy is converted to frictional heat at the interface under axial load. The quality of the welded joint depends on many parameters, including axial force, initial revolution speed and energy amount of upset. working time, and residual stresses in the joint. Inertia welding was conducted to make the large exhaust valve spindle for low speed marine diesel engine. superalloy Nimonic 80A for valve head of 540mm and high alloy SNCrW for valve stem of 115mm. Due to different material characteristics such as, thermal conductivity and flow stress. on the two sides of the weld interface, modeling is crucial in determining the optimal weld geometry and Parameters. FE simulation was performed by the commercial code DEFORM-2D. A good agreement between the Predicted and actual welded shape is observed. It is expected that modeling will significantly reduce the number of experimental trials needed to determine the weld parameters. especially for welds for which are very expensive materials or large shaft. Many kinds of tests, including macro and microstructure observation, chemical composition tensile , hardness and fatigue test , are conducted to evaluate the qualify of welded joints. Based on the results of the tests it can be concluded that the inertia welding joints of the superalloy exhaust valve spindle are better properties than the material specification of SNCrW.

열점소성 유한요소법을 이용한 대형 배기밸브 스핀들 마찰용접 공정개발

정호승(Ho-Seung Jeong),박희천(Hee-Cheon Park),오중석(Jung-Seok Oh),한명섭(Myoung-Seoup Han),조종래(Jong-Rae Cho) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-

Inertia welding is a solid-state welding process in which butt welds in materials are made in bar and in ring form at the joint face, and energy required for welding is obtained from a rotating flywheel. The stored energy is converted to frictional heat at the interface under axial load. The quality of the welded joint depends on many parameters, including axial force, initial revolution speed and energy, amount of upset, working time, and residual stresses in the joint. Inertia welding was conducted to make the large exhaust valve spindle for low speed marine diesel engine, superalloy Nimonic 80A for valve head of 540㎜ and high alloy SNCrW for valve stem of 115㎜. Due to different material characteristics, such as, thermal conductivity and flow stress, on the two sides of the weld interface, modeling is crucial in determining the optimal weld geometry and parameters. FE simulation was performed by the commercial code DEFORM-2D. A good agreement between the predicted and actual welded shape is observed. It is expected that modeling will significantly reduce the number of experimental trials needed to determine the weld parameters, especially for welds for which are very expensive materials or large shaft.

소결 T1 재종 고속도공구강조직에 미치는 여분 탄소첨가의 영향

문인형,오중석,김영입 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.9

The effect of carbon additive on the sinterability and the micro-structure of P/M-T1 grade high speed steel was investigated. The additional carbon added to the nominal composition of T1 grade high speed steel was very useful for adjustment of carbon content as well as for achievement of full densification, so far as this steel should be produced by conventional P/M technique. The optimal sintering condition was related closely with the excess carbon content. In the present work, the optimal condition was proved that the sintering temperature was 1310℃ for the specimen with 0.3w/o excess carbon.

고속도공구강의 분말야금기술에 의한 제조연구

문인형,오중석 대한금속재료학회(대한금속학회) 1982 대한금속·재료학회지 Vol.20 No.8

It was investigated, whether high speed steel part could be directly fabricated to near net shape by normal P/M process, ie. powder mixing, compacting and sintering procedure. Fe-, W-, Cr₃C₂and VC powders, whose composition is equivalent to the commercial T1 grade high speed steel, were thoroughly mixed in ball mill, and compacted into a disc-type specimens of 10㎜ diameter and about 5㎜ height at a hydraulic pressure of 5.5 ton/㎠. This compact was sintered in alumina tube furnace at temperature between 1220℃ and 1340℃, both in H₂ atmosphere and in vacuum for various sintering time. The fully densified structure could be obtained only by the sintering at the temperature above 1340℃, or by prolonging the sintering time at 1320℃. The heat treatment behavior of a directly sintered P/M HSS was similar to that of a wrought HSS, so far as the alloying components were fully homogenized during sintering process. The microstructure of the sintered, quenched or tempered high speed steel was also observed in order to elucidate the relationship between the structure and properties of the sintered high speed steel. It could be cautiously concluded that the directly sintered HSS. prepared by normal sintering process could be used supplementary for the production of near net shape HSS part, so far as the more finer Fe-powder would be used and the sintering might be carried out at the optimal temperature.

대기 플라즈마 용사법으로 제조된 철계 혼합 코팅층의 마모특성

黃昞哲,安志勳,李聖鶴,吳重錫 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.3

The objective of this study is to investigate the correlation between microstructure and the wear resistance of various ferrous blend coatings applicable to cylinder bores. Seven types of ferrous spray powders, two of which were stainless steel powders and the others were blend powders of ferrous powders mixed with Al_2O_3-ZrO_2 powders, were sprayed on a low-carbon steel substrate by atmospheric plasma spraying. Microstructural analysis of the coatings showed that iron oxides were formed in the austenitic (or martensitic) matrix by oxidation during spraying, while Al_2O_3-ZrO_2 oxides were mainly formed in the matrix for the blend coatings. The wear test results revealed that the blend coatings showed the better wear resistance than the ferrous coatings because they contained a number of hard Al_2O_3-ZrO_2 oxides. However, they had rough worn surfaces because of the preferential removal of the matrix and the cracking of oxides during wear. The STS 316 coating showed the slightly worse wear resistance than the blend coatings, but they showed the excellent wear resistance to a counterpart material resulting from homogeneous wear in oxides and matrix due to the smaller hardness difference between them. In order to improve the overall wear properties with consideration of the wear resistance of a counterpart material, the hardness difference between oxides and matrix should be minimized, while the hardness should be maintained up to a certain level by forming an appropriate amount of oxides.