• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.580-586
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• 2005

In this study, experimental tests for driving noise of various optical disk drives (ODD) have been performed using 1/2' microphone noise measurement system. Several new and old ODD models by different manufacturers are practically considered and compared far realistic driving conditions. Sound insulation case with absorbing material fur the present experimental tests is designed and constructed using CATIA system. It is found that average data transfer rate, operating RPM, and sound noise level seems to be different for the same opposed speed ODD by different manufacturers. Moreover, driving sound noise level can be largely affected by both tray shape and driving speed even for the same apparent data transfer rate.

• 한국소음진동공학회논문집
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• 제15권10호
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• pp.1169-1176
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• 2005

In this study, experimental tests for driving noise of various optical disk drives (ODD) have been performed using 1/2' microphone noise measurement system. Several new and old ODD models by different manufacturers are practically considered and compared for realistic driving conditions. Sound insulation case with absorbing material for the present experimental tests is designed and constructed using CATIA system. It is found that average data transfer rate, operating RPM, and sound noise level seem to be different for the ODD models with same denoted speed by different manufacturers. Moreover, driving sound noise level can be largely affected by both tray shape and driving speed even for the condition of the same apparent data transfer rate.

• 한국소음진동공학회논문집
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• 제25권8호
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• pp.525-531
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• 2015

Driving sound is an effective element to promote the product identity of a vehicle by providing customers with attractive sound which reflects the concept of a vehicle. Recently, major automakers are focusing on the target sound setting so that the sound can represent the brand image as well as the unique concept of a vehicle. In this study, a new method of target setting for the driving sound will be introduced based on using formant filter and musical harmonics characteristics. In addition, a target sound suggested from this method will be realized and verified by using active noise control in vehicle.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 추계학술대회 논문집
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• pp.364-369
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• 2012

The vehicle sound classified into driving sound due to power-train, operating sound due to electric motor like sunroof, door lock and electronic sound. These vehicle sound has various features depend on the characteristic of sound that user required. And it based on cultural and regional difference of user. In this study, the user required vehicle sound characteristics for luxury sedan was investigated in overall viewpoint. And virtual target sound was developed through the result of user preference investigation. Next, Jury test was carried out in Germany, USA and Korea for evaluating the target sound. And the regional and individual difference of preference was analyzed through the result of jury test. This result of research will be contributed to design of vehicle sound quality and target sound setting.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권9호
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• pp.4518-4540
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• 2019

With the development of IT convergence technology, autonomous driving has gradually developed; however, the vehicle is still operated by the driver, who should always be in good health - but sometimes, this is not the case. It is especially dangerous to drive when drowsy, and unable to fully concentrate on driving, such as when taking certain medicines, or through fatigue. Drowsy driving is at least eight times more dangerous than normal driving, and as dangerous as drunk driving. Previous research has looked at technology to detect drowsiness, in order to wake up drivers when necessary, or to safely stop the vehicle. Furthermore, many studies have been conducted to find out when drowsiness occurs. However, it is more desirable for the driver to take sufficient rest during a break, in order to be able to continue to focus and drive. In other words, it is important to maintain a normal state before drowsiness. In this study, we introduce a sound source to increase driver concentration and prevent drowsiness, another that can improve the quality of sleep, and a system that produces these sound sources. The proposed system has a noise reduction effect of about 15 dB. We have confirmed that the proposed sound induces an EEG of the desired form.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.481-482
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• 2014

• 한국음향학회지
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• 제18권8호
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• pp.108-115
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• 1999

본 연구에서는 차 실내의 공간 음향특성으로 인한 음향왜곡과 주행소음으로 인한 오디오 음질 저하를 동시에 개선하기 위한 디지털 필터를 설계하여 음질을 개선하는 방법을 제안하였다. 라우드스피커의 입력에 적용할 디지털 필터는 차량 주행 소음 특성과 차 실내의 음향특성을 고려하여 설계하였다. 차량소음 분석은 주파수 옥타브 밴드 분석법을 이용한 객관적인 분석과 감성적 분석법인 NCB 곡선법을 사용했다. 그 결과를 이용하여 오디오 유니트의 11밴드 디지털 필터 보정치를 구하는데 사용하였다. 최적 음질 구현을 위해 7가지 형태의 디지털 필터를 설계하여 기준 음악원에 적용하여 음악원 샘플을 얻었고, 여기에 100km 차량 주행소음을 합성한 9가지의 음악원 샘플을 제작하였다. 64명의 평가자를 대상으로 Scheffe'가 제안한 7점 주관 평가법을 사용하여 9가지 음악원 샘플에서 최적음질을 나타내는 디지털 필터를 선택하였다.

• 대한음성학회지:말소리
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• 제50호
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• pp.99-110
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• 2004

The normal transmission characteristics of sound are hardly obtained due to the various noises and structural factors in a running car environment. It is due to the channel distortion of the original source sound recorded by microphones, and it seriously degrades the performance of the speech recognition in real driving environments. In this paper we analyze the degree of intelligibility under the various sound distortion environments by channels according to driving speed with respect to speech transmission index(STI) and compare the STI with rates of speech recognition. We examine the correlation between measures of intelligibility depending on sound pick-up patterns and performance in speech recognition. Thereby we consider the optimal location of a microphone in single channel environment. In experimentation we find that high correlation is obtained between STI and rates of speech recognition.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.329-336
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• 1998

The characteristics of vibration and sound signals which occurs at the driving system of electric train are investigated in this study since the vibration of driving system is one of the main sources of vibration and sound in electric train. The vibration signals are changed its signal patterns during the transmission from the source to passengers due to noise or several unknown factors. To avoid the complexity of actual signals of electric train, signals from experimental apparatus of motor/gear driving system are analyzed to find the appropriate method of analysis and to characterize the signal patterns. The used methods are waterfall diagram, transfer function and modal analysis. The results shows that the vibration signals are usually originated from motor bearing and gear meshing and these signals are transmitted to bottom or bogie. Also, the sound signal is similar to the vibration of bottom or bogie, but it is not so clear to figure out the source of vibration.

• 한국콘텐츠학회논문지
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• 제16권2호
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• pp.14-24
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• 2016

최근 전기자동차와 관련된 콘텐츠 연구에서 사운드 디자인이 새로운 연구 주제로 부각되고 있다. 이 연구는 전기자동차 실내 주행음 디자인의 주요 가치들을 사용자 경험(User Experience) 측면에서 탐색하고 검증하는 것을 목적으로 진행되었다. 근거이론에 의한 탐색적 연구를 통해 맥락정보성과 정숙성을 독립변수로 도출하여 $2{\times}2$ 요인 설계로 유용성, 감성, 만족도에 대한 주효과 및 두 변인 간 상호작용 효과를 분석하였다. 실험연구를 통해 맥락정보성과 정숙성의 조합에 따라 전기 자동차의 사용자 경험에 미치는 영향이 달라진다는 점을 밝혔다. 연구 결과에 기반하여 실내 주행 사운드 가치의 개인별 선호를 고려한 사용자 니즈 최적화를 위한 후속 연구 방향을 제시하였다.