• 한국소음진동공학회논문집
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• 제21권9호
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• pp.834-841
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• 2011

Obtaining the real exciting force is important for the analysis of structural vibration or sound radiation to represent the actual condition. But in most cases, it is so difficult to get the actual force signals by direct measurement using sensors due to complex geometry. This paper suggests advanced source identification method which can be applied to the prediction of radiated noise considering correlations between measured signals. This method was implemented to the identification of the fan force in the refrigerator. The analysis of structural vibration and radiated noise caused by the fan force was also performed. The comparison between predicted SPL and measured SPL of the radiated noise by the refrigerator fan showed good agreement.

• 디지털융복합연구
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• 제14권1호
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• pp.445-452
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• 2016

본 연구는 프로야구 팬의 팀동일시와 팀충성도가 모기업 제품에 대한 구매의도에 어떠한 영향을 미치고 있는가를 실증적으로 검증하는데 목적이 있다. 이를 위해 프로야구팀 중 국내 대표적 전자제품 제조사를 모기업으로 두고 있는 삼성라이온스와 LG트윈스 팬을 연구대상으로 278명의 설문조사를 실시하여 다음과 같은 연구결과를 얻었다. 첫째, 프로야구 팬의 팀동일시는 팀충성도에 정(+)적인 영향을 미치고 있다. 둘째, 프로야구 팬의 팀충성도는 모기업 제품 구매의도에 정(+)적인 영향을 미치고 있다. 셋째, 팀충성도는 팀동일시와 모기업 제품 구매의도간을 매개하는 효과가 있다. 이상의 연구결과를 종합하여 볼 때, 팀동일시는 모기업 제품 구매의도에 긍정적인 영향을 미치는 주요 변인이며, 팀충성도는 이를 매개하는 효과가 있음을 확인하였다.

• Journal of Sport and Applied Science
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• 제4권2호
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• pp.45-51
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• 2020

Purpose: The purpose of this study is to investigate how sports fans' loyalty is built via CSR activities of professional sports teams. Furthermore, the study sought to suggest the model presenting the process of developing loyalty of sport fans by teams' CSR performance. Research design, data, and methodology: For this purpose, a survey was conducted on 450 professional sports fans through the convenience sampling method. A total of 357 of the data were used for the final analysis. Based on the collected data, frequency analysis, reliability analysis, confirmatory factor analysis, and structural equation model analysis were conducted. Results: The results showed that CSR activities contribute to building a positive image of team. Regarding fan identification, team image has also a positive effect on enhancing identification. The finding has supported the notion that attitudinal loyalty is enhanced by fan identification and further attitudinal loyalty significantly influences behavioural loyalty of fans. Conclusions: The results of this study explored the function of CSR of the teams on attitudinal and behavioural outcomes, loyalty. Moreover, the study suggested the constructual model presenting its role on enhancing fans' attitudes and behaviour affecting participation and consumption. Academic and practical implications were discussed for sport marketers and practitioners.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 B
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• pp.549-551
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• 1999

Recently, Several type of motors are used more widely in Fan system because of their low cost and high reliability. Therefore, the importance of fault detection and isolation of fan system significantly increases. The motor is a important factor bring out the fan system fault. So the problem of a fault detection for motor based on a parameter identification will be considered in this paper. After an introduction into fault detection with parameter estimation, a mathematical model for motor with special emphasis on motor itself. In the fault detection system, current and motor speed are used as parameter. Finally, simulation results are used to demonstrate the efficiency of the fault detection system.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2002년도 유체기계 연구개발 발표회 논문집
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• pp.123-128
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• 2002

Over the range(OTR) has been applied for cooking and ventilation functions especially in northern Amarica. Because flow rate and operating rpm of the double sided sirocco fan for ventilation are much higher and than the microwave oven system, the major noise source is the sirocco fm. Recently, the quiet fan development is one of very important issues for amenity. In this study, the noise source identification using multi-microphone array system was carefully carried out and numerical simulations for understanding the aerodynamic and aeroacoustic of the fan were peformed. The sound level of tonal noise is predicted with a good accuracy but that of the broadband shows some discrepancy. In order to reduce the broadband noise, the inlet region of sirocco fan have to be modified that the secondary flow should be suppressed. Based on these results, new low noise fan and OTR is now developing.

• 한국산학기술학회논문지
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• 제17권1호
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• pp.99-110
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• 2016

본 연구의 목적은 국내 프로야구 팬들이 갖는 팀 동일시에 영향을 미치는 요인을 개인 요인, 경기 요인, 경기외적 요인으로 구분하여 종합적으로 분석하는 것이다. 이를 위해 2015년 9월 중 수도권 및 지방에 소재한 3개 야구장을 방문하여 편의표본추출법에 의해 총 297부의 설문지를 수집하였으며, 다중회귀분석을 통하여 구체적인 영향력을 파악하였다. 본 연구에서 가장 관심을 갖는 것은 개인 요인으로, 특정 팀에 대한 응원을 시작한 시기가 유소년기 이전일 경우 팀 동일시에 더욱 강한 영향을 미칠 것이라는 가설을 검증하였다. 그 밖에 세 개의 경기 요인과 네 개의 경기외적 요인을 설정하고 응원시작연령과 경기 요인들 간, 그리고 응원시작연령과 경기외적 요인들 간의 교호효과를 분석하였다. 이를 통해 매우 흥미로운 결과가 도출되었는데, 유소년 기에 응원을 시작한 팬들이 그렇지 않은 팬들에 비해 확연하게 강한 팀 동일시 정도를 나타낸다는 것이다. 또한 이 경우 선수 요인이 팀 동일시에 미치는 긍정적 영향을 더욱 강화하는 것으로 밝혀져, 교호효과 역시 일부 존재하는 것으로 분석되었다. 경기 요인과 경기외적 요인 중에서는 선수, 판촉 및 팬 서비스, 가격, 연고지 요인이 팀 동일시에 긍정적인 영향을 미치는 것으로 분석되었다. 본 연구는 기존에 거의 시도되지 않았던 스포츠 산업에서의 아동마케팅의 효과를 실증 분석함으로써 이론적 발전에 기여함은 물론 프로구단으로 하여금 보다 강력한 유소년 마케팅 정책을 펼치도록 하는데 도움을 주는 전략적 시사점을 제공했다는 데에서 의의를 찾을 수 있다.

• 소음진동
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• 제8권6호
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• pp.1043-1052
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• 1998

The noise sources in the outdoor unit of RAC are identified by the sound intensity method. The main noise sources are compressor noise and fluid noise which is caused by the fan. heat exchanger and shroud. First. the fluid noise is reduced through the design of new fan and shroud. reduction of the system resistance by rearrangement of heat exchanger. and optimization of the complex parameter between the fan and shroud. Next, in order to reduce the compressor noise, the new shape of compressor mount and sound-proof material was applied. As a result, the overall noise was reduced by 4∼5dB (A).

• 전기학회논문지
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• 제62권10호
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• pp.1397-1402
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• 2013

This study researched cause of resonance noise for BLDC motor used in the refrigerator. it is difficult to measure dynamic characteristics for small sized fan & rotor system with conventional excitation method. Therefore this study performed electric exiting method and natural frequency method using microphone instead of conventional excitation and showed validity of these methods. Study result showed that tortional vibration frequency of fan & rotor system and natural bending frequency of the fan were matched with exciting frequency of BLDC motor caused by commutating ripple torque. And this frequency match caused resonance of the system. The study analyzed main parameters of this phenomenon and suggested alternative solution.

• 한국소음진동공학회논문집
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• 제26권4호
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• pp.383-390
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• 2016

In this paper, experiment and dynamics simulations were carried out to identify and reduce the out-of-plane vibration that occurs in a centrifugal fan of an air conditioner installed to a wall. In a wall-installed air conditioner, large space between a case and heat exchanger is often required for the fan to avoid the collision with the case and exchanger. This large space hinders the slim design of the air conditioner even if air conditioner market demands a slim air conditioner. In the present study, in order to determine the cause of the vibration in the centrifugal fan, the out-of-plane vibration and the physical properties were investigated, and the dynamic characteristics of the centrifugal fan were obtained by experiments. Based on these experiments, a dynamic simulation model was established to determine the cause of the out-of-plane vibration of the centrifugal fan. It was found that the main factor of out-of-plane vibration in the centrifugal fan is the axial misalignment between the centrifugal fan and the motor shaft.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 제37회 하계학술대회 논문집 B
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• pp.861-864
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• 2006

냉장고에 적용된 BLDC Fan Motor에 있어서 공진소음의 원인에 대하여 연구하였다. 연구에 있어서 종래의 가진 방법을 적용하기 곤란한 구조를 가진 소형 Fan & Rotor System의 동 특성 실험에서 전자 가진법 및 Microphone을 이용한 고유진동수 계측방법을 사용하고 그 타당성을 보였으며 연구결과, Pan과 Rotor System의 비틀림 고유진동수와 Fan의 굽힘 고유진동수가 BLDC Motor의 Commutating Torque Ripple에 의한 가진 주파수와 일치하여 공진이 발생하는 것으로 분석 되었으며 이와 관련된 주요 인자를 분석하고 대안을 제시하였다.