• 한국산학기술학회논문지
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• 제17권7호
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• pp.720-725
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• 2016

본 논문은 APU 소음이 램프 근로자들의 업무 효율이나 스트레스에 어떠한 영향을 미치는지 연구하기 위해 진행되었다. 본 연구를 위하여 우선 공항 램프 근로자들에게 설문조사를 실시하였으며, 그 결과를 분석하였다. 설문조사의 주요 내용은 기초조사를 포함한 램프에서의 항공기 APU 소음이 근로자들에게 미치는 영향과 항공기 APU 소음과 스트레스와의 상관 관계, 마지막으로 항공기 APU 사용시간제한에 관한 설문조사를 실시하였다. 설문조사 결과에 따르면, 설문 대상은 남성이 여성보다 많은 86%를 차지하고 있었으며, 응답자 중 80% 이상이 15년 미만 근로자들로 집계되었다. 설문조사의 직업군은 항공정비사 41명, 지상조업(수화물 담당, 배수 서비스, 폐기물 서비스) 70명, 승무원 담당 19명, 램프관리 18명, 기내식 서비스 12명으로 총 160명으로 집계 되었다. APU 소음에 대해 74%는 APU 소음이 항상 시끄럽게 느껴진다고 응답하였으며, 26%는 가끔 시끄럽게 느껴진다고 응답하였다. 또한, 약 85%의 응답자는 APU 소음으로 인해 신경이 예민해지고 스트레스를 받고 있다고 느끼고 있었으며, 대부분의 응답자가 APU 소음으로 업무 효율이 떨어지고 있다고 응답하였다. 따라서 본 논문은 램프 근로자들의 설문조사 결과를 바탕으로 회귀분석과 카이스퀘어 분석을 이용해 APU 소음과 업무 영향성, 그리고 스트레스와의 관계를 비교 분석하여 연구를 진행하였다.

• 한국멀티미디어학회논문지
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• 제18권4호
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• pp.437-442
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• 2015

Voice activity detection is very important process that voice activity separated form noisy speech signal for speech enhance. Over the past few years, many studies have been made on voice activity detection, but it has poor performance in low signal to noise ratio environment or fickle noise such as car noise. In this paper, it proposed new voice activity detection algorithm using ensemble variance based on wavelet band entropy and soft thresholding method. We conduct a survey in a lot of signal to noise ratio environment of car noise to evaluate performance of the proposed algorithm and confirmed performance of the proposed algorithm.

• Journal of Advanced Marine Engineering and Technology
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• 제32권8호
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• pp.1309-1314
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• 2008

Seismic data is often contaminated with high-energy, spatially aliased noise, which has proven impractical to attenuate using Fourier techniques. Wavelet filtering, however, has proven capable of attacking several types of localized noise simultaneously regardless of their frequencies. In this study a 2-D stationary wavelet transform is used to decompose seismic data into its wavelet components. A threshold is applied to these coefficients to attenuate high amplitude noise, followed by an inverse transform to reconstruct the seismic trace. The stationary wavelet transform minimizes the phase-shift errors induced by thresholding that occur when the conventional discrete wavelet transform is used.

• 한국소음진동공학회논문집
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• 제15권8호
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• pp.980-987
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• 2005

It is very difficult to reduce ambient noise level in the downtown. The best method is to improve the sound amenity of the districts, considering concept of soundscape. This study aims to survey the effect of introducing sound and masking to reduce the background noise level. We carried out the evaluating test for 18 introducing sounds varied S/N ratio(-5, 0, +5) in the city riverside. In these test, subjects evaluated the sound environment with five bipolar adjective scales. It was evaluated that introducing sounds improved the sound environment, and that S/N +5 dB was very appropriate to mask the background noise. But the hearing level was suggested to be S/N 0 dB or less.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.607-610
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• 2005

It is very difficult to reduce traffic noise level in the downtown. The best method is to improve the sound amenity of the districts, considering concept of soundscape. ?his study aims to survey the effect of introducing sound and masking to reduce the background noise level. We carried out the evaluating test for 18 introducing sounds varied S/N ratio(-5, 0, +5) in the city riverside. In these test, subjects evaluated the sound environment with five bipolar adjective scales. It was evaluated that introducing sounds improved the sound environment and that S/N + 5dB was very appropriate to mask the background noise. But the hearing level was suggested to be S/N 0 dB or less.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2001년도 학술논문발표회
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• pp.14-21
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• 2001

Recently, with the increasing of construction works, large construction equipment are used to reduce the term of work and labor cost in construction field. Therefore, construction equipment noise has caused much annoyance for a number of dweller in nearby construction field and it has become a very serious problem in our living environment. Nevertheless, in our country, adequite guidelines for the construction equipment noise are very deficiency because of the lack of basic data and insufficient research works. From this point of view, this study attempts to survey the characteristics and prediction of SIP piling noise. On the basis of measurement value, we analysed about prediction possibility of SIP piling noise by computer simulation.

• KIEAE Journal
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• 제4권3호
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• pp.37-44
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• 2004

In this study, foreign and domestic noise criteria on walls, floors, and water supply facilities were reviewed and the results are as follows : regulation can be divided two things, one is on thickness the other is sound insulation performance. Green Building regulation based on the law and this have sound classification systems. Since these regulations are not established in Korea. The noise regulation on water supply-drain facilities and domestic guideline on interior noise level is needed. Foreign regulations are stricter than those of ours. And those has sound classification system for the better acoustic condition of inhabitants'.

• 한국소음진동공학회논문집
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• 제23권12호
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• pp.1111-1116
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• 2013

In the present study, annoyance caused by diverse construction noises was evaluated through surveys. A survey with a total of 110 construction workers was carried out to investigate annoyance from construction noises at different construction phases. The most effective item of adverse by construction noise was annoyance and the most annoyed construction stage was destruction construction. There were high correlation between work performance and work safety as well as work safety and speech interference. Participant's noise sensitivity were significant between low and high group at work performance, work safety, speech interference.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 추계학술대회 논문집
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• pp.408-413
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• 2011

In the present study, annoyance caused by diverse construction noises was evaluated through surveys and laboratory experiments. A survey with a total of 110 construction workers was carried out to investigate annoyance from construction noises at different construction phases. The most effective item of adverse by construction noise was annoyance and the most annoyed construction stage was destruction construction. Between work performance and work safety had correlation as well as between work safety and speech interference. Participant's noise sensitivity were significant between low and high group at work performance, work safety, speech interference.

• 한국주거학회논문집
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• 제12권3호
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• pp.149-156
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• 2001

Recently, with the increase of income level, many people desire to have agreeable and quiet surrounding. However, construction noise has caused much annoyance for a number of dwellers and workers in nearby construction field. It has become a very serious issue in our living environment. For the accurate evaluation of construction noise with various frequency spectrums and fluctuation characteristics, the evaluation system should reflect not only physical quantities but also the psychological respects of individual persons. With preceding study of psycho-acoustical experiments, this study attempts to survey the classification of adjectives and sound using the method of selected description and intends to get the basic data for establishment of a standard about construction noise.