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안지호 ( Ji Ho Ahn ),박옥경 ( Ok Kyung Park ),최수훈 ( Su Hoon Choi ),정봉덕 ( Bong Duk Jung ),이희정 ( Hee Jung Lee ) 충북대학교 과학교육연구소 2010 과학교육연구논총 Vol.25 No.2
We propose a teaching material for helping students understand phenomena related to the three dimensional harmonic vibration. The simple harmonic motion of a particle attached springs on a horizontal frictionless plane (a two dimensional plane) can be visualized by so called Lissajous figures. Extending it by using the track of laser beam on vibrating screen after two reflections from the two mirrors vibrating in the two perpendicular directions to the vibration direction of the screen, we made a teaching material to visualize phenomena related to the simple harmonic motion in the three dimensional space.
공모사업 계획수립단계에서 주민의견조사의 실효성에 관한 연구
김성훈(Kim, Sung-Hoon),박수훈(Park, Su-Hun) SH도시연구원 2018 주택도시연구 Vol.8 No.2
The purpose of this study is to include the limitations of the actual project, including how the participation of residents reflected in development of the plan, at the stage of the contest for participation by students, or development of the plan. As a method of research, the final plan was compared with the final plan through a prior study review, a theoretical review of related projects, and a survey that collected opinions from residents in the actual plan. The range was selected for two towns submitted to the 2017 Seoul Campus Town, that was conducted using a university studio, and the 8th Maeul-mandeulgi competition in Seoul. The survey was conducted with residents and users in three methods, through questionnaires, interviews, and questionnaire boarding. Campus Town collected a total of 1,499 opinions from residents, merchants and students, and in its village creation, 212 from the two towns it submitted to the contest. The following implications were derived from the study results, analyzed and compared to the actual plan through such comments. First, because of the nature of contests, collecting opinions in the plan randomly provides various methods such as questionnaire, questionnaire boarding, interview, etc. In this way, however, the residents of the village cannot hear opinions on student contests, and public projects, for a short period. Second, for questionnaires, duplicate answers to the same question are allowed. If such a duplicate response is allowed, the difference between the effective and total number of samples is significant, making the survey less reliable. Third, when the questions are similar in type or when taking the survey with questions that could produce specific items, it has been revealed that the questionnaire is more effective in collecting opinions than the questionnaire. Fourth, the planner identifies the status of the survey and prepares the questionnaire, assuming the survey flows in the direction of the plan. There is a question as to whether these surveys were actually collected by residents. Fifth, comparing residents’ participation in the project with eight levels of Arnstein’s participation in the community, it is inducing residents’ participation as a consultation step, but it is only a formality.
이동녕,박수훈 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.2
The plastic instability in high purity aluminum, commercial purity aluminum and 2024 aluminum alloy sheets was studied using uniaxial tension testing. The emphasis of the study was on the effects of thickness and anisotropy in cold worked specimens and annealed specimens. Localized necking was observed in the specimens whose thickness to width ratio was less than about one fifth regardless of the condition of specimens. The angle between the localized neck trough and the tensile direction is shown to vary with the plastic strain ratio or the R value measured with respect to the tensile direction, whether specimen is planar isotropic or not. The strain at which local necking occurs can also be influenced by anisotropy of the specimen.