• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 제13회 신호처리 합동 학술대회 논문집
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• pp.767-770
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• 2000

본 논문에서는 고음질 오디오 신호에 임의로 삽입된 반향(Echo)신호가 음질에 미치는 영향을 조사하고, 이를 이용한 오디오 워터마킹 기법에 대해 다룬다. 일반적으로 오디오 신호에 반향을 첨가하게 되면 음색이 더욱 풍부해지는 효과를 얻을 수 있지만. 이 때 삽입된 반향신호의 시간 지연과 크기가 충분히 작을 경우에는 심리 음향모델의 시간영역 마스킹 효과에 의해 지각되지 않을 수도 있다 한편 오디오 신호의 구간별로 임의 삽입된 반향의 시간지연을 검출할 수 있다면, 이를 이용한 정보 감춤(data hiding)및 워터마킹 기법에 활용할 수 있다. 반향신호를 이용하여 원 신호에 정보를 삽입하게 되면 가우시안 잡음이나 PN 시퀸스를 이용하는 경우처럼 오디오 신호에 이질적인 잡음을 첨가하지 않기 때문에 청감 특성상 유리하며, 오디오 신호 고유의 통계적 특성을 유지 할수 있는 장점이 있다. 그러나 반향의 첨가가 음질의 왜곡은 초래하지 않으면서 정보의 검출이 가능하도록 하기위해서는 원 신호의 특성에 따른 반향 첨가 기술이 요구된다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.367-371
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• 2005

Social noise survey on multiple residential noises such as nut impact, air-borne, bathroom, drainage and traffic noises was conducted to investigate major variables affecting the overall satisfaction for noise environment The effect of individual noise perception on the evaluation of the overall noise environment was investigated through a questionnaire survey on annoyance, disturbance and noise sensitivity. Auditory experiments was also undertaken to determine noise level according to the percent of satisfaction for individual noise source. As a result of survey, it was found that satisfaction for floor impact noise most greatly affects the overall satisfaction for noise environment and annoyance most greatly affects the satisfaction for individual noise sources. Result of auditory experiment showed that the noise level of floor impact noise by bang machine, airborne, drainage and traffic noise corresponding to 50% satisfaction is 44dB($L_{i,Fmax,AW}$) and 40dBA, respectively.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.581-586
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• 2008

This study aims to examine the existing single rating index in terms of level reduction limit of heavy-weight floor impact sound. To achieve this goal, sounds which have same loudness according to rating methods were suggested to subjects. And followings are results. 1) The rating method of measurement frequency level average is more suitable than that of other methods which are dependent on specific frequency for rating heavy-weight floor impact sound. 2) Level average for measurement frequency of 31.5Hz - 500Hz is more correspondent to psycho-acoustic response than that of measurement frequency of 63Hz - 500Hz which is for KS F 2863-2, existing rating method.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.679-682
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• 2007

This study aims to select the proper vocabularies for evaluation about the noise emission from water supply and drain installations in apartment bathroom. As a result of surveying overlapping vocabularies and scores of them for each sound sources, 'annoying', 'noisy', 'dynamic' and 'strident' are main unpleasant vocabularies to the noise from water supply and drain installations in apartment bathroom. And vocabularies such as 'dynamic', 'sudden', 'loudness', 'noisy' are classified into the first factor by analysis.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.1134-1139
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• 2007

In recent years, public complaints about railroad noise by KTX and Ordinary train are increasing. Restriction of railways uses same standard without distinguishing the type of railways. According to the type of railways, the frequency characteristics of emitting noise is different. Therefore it is requested to know how vary the public response to each types of railway. The noise annoyance to three types of trains (KTX, Electric train, Diesel train) was analyzed by Jury Evaluation Test for assessing the effect of frequency characteristics. The numerical results by a Semantic Differential Method showed that annoyance response to three type of trains depended on the frequency characteristics. As a result, this study proposed that the KTX could have a bonus level of maximum 2.9dB(A) to ordinary train.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.133-137
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• 2007

As the waterpower generation plant, the subject of this Study, is a facility that produces plenty of electricity corresponds to $196{\sim}240GWh$ annually, and in its generation process it creates a loud noise when the turbine related to the hydraulic turbine dynamo revolves, and since such loud noise must be transmitted to the dynamo room and amplified, it is effecting a lot of influences to the adjacent office and space. In such viewpoint, this Research, based on the soundproof measure presented at the preceding research, has attempted to evaluate about the effect of noise-reduction countermeasure against the hydraulic turbine dynamo using Auralizational Technique through Psycho-Acoustics Experiment. It deems that such result could be applied hereafter as the useful material when setting up a soundproof countermeasure for the hydraulic turbine dynamo room in dam.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2006년도 추계학술대회논문집
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• pp.739-746
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• 2006

Anthropogenic underwater sound such as ship radiated noise, pile driving noise. underwater explosive blast and so on, affects marine animals. This study describes the effects of underwater noise on fishes. The characteristics of noise, fish hearing and response, and sound propagation loss are analysed based on existing results and measured data in marine construction site. Finally, the safety zone range of fish on man made underwater noise is derived.

• 한국안전학회지
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• 제20권2호
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• pp.73-78
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• 2005

A fire is occurring increasingly every you and the damage is bigger in proportion to the number. Therefore a fire is classified as a serious calamity. It is important to evacuate and fight a fire by early Perception. However, if the alarming sound is not perceived when a fire breaks out the damage could be expanded. From this point of view, this study aims to analyse the correlation between alarming sound sources and sound quality parameters through psycho-acoustic experiment using Korean vocabularies extracted by existing study. The sound sources more dangerous, tense and urgent were chosen. The results from this study are as follows: 1. airraid, klaxon2 and S.O.S got a point more than conventional alarming sound.2. correlation coefficient between Loudness(L) and Unbiased Annoyance(UA) was highest with 0.63 md Sharpness(S) and Roughness(R) was -0.40 and Fluctuation Strength(FL) and Tonality(T).

• 한국음향학회:학술대회논문집
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• 한국음향학회 2004년도 추계학술발표대회논문집 제23권 2호
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• pp.275-278
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• 2004

본 논문에서는 저 비트오율 압축 시 발생되는 신호 왜곡을 인간의 지각적 특성을 이용하여 음질을 개선하는 알고리즘을 제안한다. 저 비트오율 압축 과정에서 손실된 고주파 영역의 신호를 부가 정보를 사용하지 않고 손실되지 않은 영역의 정보를 사용하여 고주파 영역의 신호를 첨가함으로써 음질을 개선하였다. 비 손실 영역의 순음 및 비 순음 성분을 검출하여 손실영역에 해당 하모닉 성분을 청각 자극 에너지로 스케일 하여 새로운 신호를 첨가한다. 원 신호와 저 비트오율 압축으로 인해 왜곡된 신호, 그리고 본 논문의 알고리즘을 이용하여 개선된 신호를 신호 대 잡음 비를 측정하고 청감 테스트를 통해 음질 개선 효과를 확인하였다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.486-491
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• 2002

Auditory experiments based on subjective responses were undertaken for the standard heavy and light weight impact noise. Relations between noise levels and subjective evaluations were also investigated. As a result, it was shown that the noise class was rated with the range of sensible satisfaction by investigating the various social responses for the floor impact noise. The rate classification for the heavy weight impact noise is suggested as a design guide for concrete slabs which satisfy the residents' requirements in various sound insulation capacities of multistory residential buildings.