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반응표면 분석법을 이용한 마이크로 스피커 다이아프램의 형상최적설계
안찬우,홍도관,우병철,박일수,권용수,최재기 동아대학교 생산기술연구소 2006 生産技術硏究所硏究論文集 Vol.11 No.-
This study uses a characteristic function to explain correlations between the objective function and design variables. Analysis of means and table of orthogonal array were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on the table of orthogonal array is made. Therefore, this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using design of experiments and characteristic function with constraints. We showed improved design variables.
파크골프 참여 노인의 스포츠건강신념이 레크리에이션 전문화에 미치는 영향
안찬우,정찬수 한국운동재활복지협회 2023 운동재활·복지 Vol.4 No.3
이 연구는 파크골프 참여 노인의 스포츠건강신념이 레크리에이션 전문화에 미치는 영향을 구명하는데 그 목적이 있다. 이를 위해 D시에서 파크골프를 즐기는 202명을 단순무작위표집법으로표집 하였다. 그리고 자료는 컴퓨터에 입력(coding)시키고, jamovi 2.3.28 Version과 SPSS 24.0 Version을 이용하여 기술통계분석, 확인적 요인분석, 신뢰도분석, 상관관계분석, 표준중다회귀분석을 실시하여 검증하였다. 이상의 연구방법과 절차를 통하여 다음과 같은 결론을 얻었다. 파크골프 참여 노인의 스포츠건강신념이 레크리에이션 전문화의 하위변인 중 정보, 기술지식, 경험, 숙련도, 중요성, 중심성, 물리적 열정에 유의한 영향을 미치는 것으로 나타났다. 이를 토대로 파크골프참여 노인의 스포츠에 대한 건강신념이 높을수록 레크리에이션의 전문화를 높이는 것을 알 수 이었다. 따라서 스포츠에 대한 건강신념을 높이기 위한 다양한 프로그램이 개발되어야 하며, 이는 노인의 스포츠 참여에 대한 증가와 활성화로 이어질 수 있다 The purpose of this study is to investigate the impact of sports health beliefs of elderly people participating in park golf on recreation specialization. For this purpose, 202 people who enjoy park golf in D city were sampled using simple random sampling. The data were then entered (coded) into a computer and verified by conducting descriptive statistical analysis, confirmatory factor analysis, reliability analysis, correlation analysis, and standard multiple regression analysis using jamovi 2.3.28 Version and SPSS 24.0 Version. Through the above research methods and procedures, the following conclusions were obtained. The sports health beliefs of seniors participating in park golf were found to have a significant impact on information, technical knowledge, experience, proficiency, importance, centrality, and physical passion among the sub-variables of recreation specialization. Based on this, it was found that the higher the health beliefs about the sport of elderly people participating in park golf, the higher the specialization of recreation. Therefore, various programs should be developed to increase health beliefs about sports, which can lead to increased and revitalized sports participation among older adults.
안찬우,최석창,김동영 한국소음진동공학회 1997 소음 진동 Vol.7 No.6
This paper describes the effects of dual dynamic vibration absorbers attached to a primary vibration system with damping. The efficiency of dual dynamic vibration absorbers was investigated with the height of amplitude ratio at the resonance frequency ratio of the damped vibration system according to mass ratio, natural frequency ratio and damping ratio. The variation of amplitude ratio related to frequency ratio of primary vibration system is verified experimentally and theoretically according to dual dynamic vibration systems using computer program designed to find mutual relationship between two absorbers.
안찬우,정현,김예진 한국특수체육학회 2023 한국특수체육학회지 Vol.31 No.4
This study sought to understand the subculture of park golf clubs by classifying and examining the characteristics of the sub-culture by type. For this purpose, eight people who were active in the park golf club were selected as research participants and data was collected through in-depth interviews and participant observation. The collected data were converted into text data through transcription, and the following conclusions were drawn through the analysis process of categorization and conceptualization of meaning. First, the characteristics of the park golf club's game management were the game expedition culture, betting culture, and enforced norm culture. Second, the social relationship characteristics of the park golf club were found to be positive and negative social relationship characteristics. Third, the cultural characteristics of the park golf club were showing off expensive equipment, improving the sense of belonging to the club through monthly meetings, and self-achievement through obtaining certification.
Preparation and thermal behavior of polystyrene end-functionalized with sulfonyl azide units
안찬우,홍성철 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Sulfonyl azides, RSO2N3, are sensitive to heat and irradiation due to the facile elimination of molecular nitrogen, generating highly reactive R-N nitrene intermediate (singlet and triplet). Sulfonyl azide group is well known agent for the modification and cross-linking of various hydrocarbon compounds by C-H insertion reaction of the singlet nitrene. In previous studies, the thermal behavior of low molecular weight compounds containing the sulfonyl azide group has been well explored. However, little effort has been devoted to explore the thermal behavior of polymer containing sulfonyl azide end groups. In the presented work, we synthesized an azo-based initiator containing sulfonyl azide end groups, which was then subsequently used to prepare polystyrene end-functionalized with sulfonyl azide units. Thermal behavior of the end-functionalized polystyrene was then studied by using FT-IR and DSC.
자동차용 Seat Adjust DC Motor의 NVH 저감에 관한 연구
안찬우,홍도관,권용수,최재기,허윤 동아대학교 생산기술연구소 2006 生産技術硏究所硏究論文集 Vol.11 No.-
Recently, usage of DC motor is increasing for vehicle convenience and safety. According to trend, interest for noise and vibration are increasing too. In this paper, decrease of noise & vibration for Compact motor (which) developed for vehicle miniaturization and lighten will be studied. All of test implemented under actual load. Natural frequency of each parts are measured through modal & Random excite except resonance by Natural frequency.
뜨거운 납작관이 존재하는 차가운 사각 밀폐계 내부의 자연대류에 관한 수치적 연구
안찬우,최훈기,박용갑 대한기계학회 2023 大韓機械學會論文集B Vol.47 No.9
This study investigated the effect of the aspect ratio of a heated flat tube on natural convection in a square enclosure. The Rayleigh number was varied between 103 and 106, and the Prandtl number was fixed at 0.71. The aspect ratio of the flat tube was considered in the range of 0.5 ≤ AR ≤ 2.5 in intervals of 0.5. The thermal and fluid flow characteristics were regarded to be independent of time in the range of the Rayleigh number and aspect ratio of the flat tube considered in this case. The effect of the aspect ratio on heat transfer quantities increased with increasing Rayleigh number. At the same Rayleigh number, the heat transfer characteristics improved as the aspect ratio increased. The surface-averaged Nusselt number of the flat tube at the Rayleigh number of 105 and aspect ratio of 2.5 increased by approximately 5.72% compared with that of a circular cylinder.
안찬우,홍성철 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Sulfonyl azide group, RSO<sub>2</sub>N<sub>3</sub>, generates reactive nitrene intermediate by heat or irradiation. The nitrene functionality may then react with C-H bonds of hydrocarbon compound, resulting in modification of the compound. As a model study, non-catalytic and solvent-free postpolymerization modification of polyethylene was attempted employing polystyrene with sulfonyl azide functionality. Firstly, azo based initiator containing the sulfonyl azide functional groups was synthesized, followed by the polymerization of styrene using the initiator to afford polystyrene end-functionalized with sulfonyl azide groups (PS-SA). Commercially available high-density polyethylene (HDPE) was then thermally treated with the PS-SA by using Brabender melt mixer. The modified HDPE exhibited improved tensile mechanical properties, suggesting the potential of this value-adding approach as an efficient technical platform to modify various polymers.