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2축 피로시험에서 혼합모드(Mode Ⅰ + Ⅱ) 구현에 관한 연구
최성대(Seong-Dae Choi),정선환(Seun-Hwan Cheong),김잠규(Jam-Kyu Kim),김기만(Gi-Man Kim),최명수(Myong-Su Choi),김우재(Woo-Jae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the detection of a tool failure in turning process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. A preliminary stepped workpiece which had intentionally a hard condition was cut by the inserted cermet tool and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms.
카본/메조세공 실리카 복합 막을 응용한 키랄 에폭사이드의가수분해반응과 동시 분리
최성대 ( Seong Dae Choi ),전상권 ( Sang Kwon Jeon ),박근우 ( Geun Woo Park ),양진영 ( Jin Young Yang ),김건중 ( Geon Joong Kim ) 한국공업화학회 2014 공업화학 Vol.25 No.5
The carbon/porous silica composite membrane was fabricated in a simple manner, which could be successfully for the simultaneous separation and production of chiral epoxides and 1,2-diols, based on their differences in hydrophilic/hydrophobic natures. The chiral Co(III)-BF3 salen catalyst adopted in the membrane reactor system has given the very high enantioselectivityand recyclability in hydrolysis of terminal epoxides such as ECH, 1,2-EB, and SO. The optically pure epoxide and the chiral catalyst were collected in the organic phase after hydrolysis reaction. The hydrophilic water-soluble 1,2-diol product hydrolyzed by chiral salen diffused into the aqueous phase through the SBA-16 or NaY/SBA-16 silica composite layer during the reaction. The water acted simultaneously as a reactant and a solvent in the membrane system. One optical isomer was obtained with high purity and yield, and furthermore the catalysts could be recycled without observable loss in their activity in the continuous flow-type membrane reactor.
최성대(Seong Dae Choi),김기만(Gi Man Kim),김잠규(Jam Kyu Kim),허빈(Bin Xu),김종환(Jong Hwan Kim),이달식(Dal Sik Lee) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The vibrating situation of machining center is natural during operating it. If it is possible that you are understanding in theory of mechanism about vibrating situation of machining center and get the hang of vibrating aspect through analysis and control it. It will be very useful for the improved stability and high-speed in operating a machining center for developing productivity.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김잠규(Jam-Kyu Kim),최명수(Myoung-Su Choi),공병채(Byeong-Chae Gong) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The complicated stress modes which are common in most machine structures and parts make the analysis of fracture mechanism The fracture mechanism which are common in most machine structures and parts shows mixed-mode stress. It is very difficult to analyze its behavior using numerical method. In this study, the experiment of fatigue crack growth as varying of stress ratio was carried out and its effects was analyzed. And existence of fatigue fracture closure was observed through fractured surface.
평판TV 프레임의 PEM NUT 대체용 Forming 설계
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김잠규(Jam-Kyu Kim),임광빈(Kwang-Bin Lim),김우재(Woo-Jae Kim) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Structure which is being used for flat TV is consisted almost of press products. Because of characteristic of structure, pemnut that is used for maintaining gaps of other parts and screwing is using by attaching on frame. But, there are some issues about weight and price. This study is about using forming instead of pemnut on frames, and deducing the best answer by comparing analysis of forming designing on background of tension press and twisting.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김기만(Gi-Man Kim),변용근(Yong-Kun Byun),김잠규(Jam-Gyu Kim),양승철(Seung-Cheol Yang) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
Industrial technology has been used to surface hardening method to improve the surface. Shot peening is the one of the surface hardening method and it is used for removing the defect from the surface of steel and improving the fatigue strength on surface. The object of this research work is to investigate the influence of mechanical property by shot peening of hinge spring throughout the experimental method on roughness, hardness, creep, fatigue test and photography. From the result of the this paper, shot peening is improved the surface hardness, heating resistance, fatigue strength of hinge spring and has examined that shot peening is essential requirement to design the hinge spring.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),권현규(Hyun-Kyu Kwon),정영관(Young-Kwan Jeong),홍영배(Yong-Bae Hong) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.4
Glass-to-metal contact should be prevented in the design of any structural glass component. Because glass is extremely brittle and will fracture readily if even a small point load is applied. If the assembly includes a glass component supported by metallic structure, designers should provide a pliable interface of some kind between the two parts. But there happens high demand of glass-to metal contact in semiconductor industries due to adoption of dry cleaning process as one of the good solution to reduce running cost - carry out equipments cleaning with high corrosive and etching gas such as CF4 with keeping process temperature as the same as high service temperature. Therefore the quartz glass have to be received compression by direct contact with metal as the form of weight itself and vacuum pressure and fatigue by vibrations caused by process during the process. In this paper investigation will be carried out on fracture behavior of quartz glass contacted with metal directly under local load and fatigue given by process vibration with apparatus which can give lox\cal load and vibration through PZT ceramics to give guideline to prevent unintended fracture of quartz glass.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),김기만(Gi-Man Kim),양승철(Seung-Cheol Yang),김잠규(Jam-Gyu Kim) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
An experimental investigation with diode laser system was carried out to study on the improvement of thin sheet structure characteristics. The surface heat treatment characteristics of the laser beam on the thin sheet are evaluated using hardness tests, tensile test. The mechanical properties of hardening area indicated such as 877Hv hardness, 345㎬ elastic modulus and 774㎫ tensile strength compare to the low material. We were carried out structure characteristics of thin sheet by laser bean using ANSYS 11.0. Results indicated that the structure characteristics were improving value such as stress and displacement according to the increasing of irradiated laser beam times on the thin sheet. The direction of cross section on the thin sheet was improving structure characteristics more than axial direction and longitudinal direction.
최성대(Seong-Dae Choi),정선환(Seon-Hwan Cheong),유종규(Chong-Kyu Yoo) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.2
The Toyota production system (TPS) developed by Toyota corporation is a management principle and production model to improve values added through elimination of waste. Since the oil shock in 1970s, the TPS has drawn the worldwide attentions as a main factor of competitiveness of Japanese manufacturing system and has been studied and implemented in many countries regardless of size and types of industry. For the correspondence to various customer's requirement, it is required to establish on time delivery procedure and to shorten lead time. Therefore it intended to establish TPS which is adopted to 7 losses reduction and JIT(Just in Time). In this paper, the automatic production line for color TV manufacturing by TPS was developed and proved to push up two times of productivity, to reduce the 25 workers at a time, and to widen the flexibility of manufacturing from 14" to 25" TV.