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균일전단응력을 받는 2차원 균열포함 무한체에 대한 복소응력함수
김옥환(Kim, Ok-Whan) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-
2차원균열을 포함하고 있는 무한체가 균일한 전단응력을 받고 있는 경우에 대한 복소응력함수를 기 존의 응력함수를 이용하여 해석적으로 구하였다. 이는 등각사상과 정칙연속법에 의하여 구하였다. 결 과는 극한의 경우에 대하여 검증하였으며 구한 복소응력함수는 맞는다는 것을 보여준다.
혼합형 하중항에 있는 판재로 보강된 균열판의 응력세기계수
이강용,김옥환,Lee, Kang-Yong,Kim, Ok-Whan 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
The mode I and II stress intensity factors have been calculated theoretically for the cracked plate reinforced with a plate by symmetric spot welding under remote mixed mode loading. This is the extension of authors' previous work for the reinforced cracked plate under remote normal stress. Regardless of loading types, the reinforcement effect gets better as one joining spot is closer to the crack tip and the others are closer to the crack surface, and optimum number of the joining spots can be existed. For the present model, the remote loading parallel to crack surface produces the mode I stress intensity factor.
Stress Optimization of plastic IC package in reflow soldering process
김근우(Geun Woo Kim),이강용(Kang Yong Lee),이택성(Taek Sung Lee),김옥환(Ok Whan Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
In order to reduce stress in the plastic small outline J-lead(SOJ) package and prevent the interface delamination under the infrared(IR) soldering process, parameterization, parametric study and optimization are used. The design variables of dimensions and material properties are determined among all the possible variables from the parametric study. Their optimized values are determined by applying the constraint optimization to the parameterized IC package.
차량용 파워 시트 작동음의 감성 어휘 추출 및 주관적 음질 평가에 관한 연구
김성육(Sung-Yuk Kim),장주광(Ju-Gwang Jang),지효성(Hyo-Seong Ji),김옥환(Ok-Whan-Kim),김기선(Key-Sun Kim) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.2
In this study, emotional adjectives about the operating sound quality of the vehicle power seat are constructed, and the effectiveness of the emotional adjectives are verified by evaluating the operating sound quality. First, emotional adjectives were collected from the literature related to the automobile field and other sound qualities. A questionnaire was made using these adjectives. The questionnaire was designed to be able to select all adjectives that could express the operating noise of the power seat slide adjuster by applying the multiple- response method. Next, a subjective sound quality evaluation was conducted using the emotional adjectives. In the evaluation, we first recorded the operating noise for two power seats. Second, the subjective sound quality evaluation was performed on the recorded operating noise using a loudspeaker. Finally, through a statistical analysis on the sound quality evaluation results, the relationship between the semantic space and the preference score was verified, and the validity of the emotional adjectives was verified.