• 전자공학회논문지 IE
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• 제49권2호
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• pp.9-17
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• 2012

음성 인식 시스템의 용용에서 실제 문제점의 하나는 음성신호의 왜곡에 의한 인식성능의 저하이다. 음성신호의 왜곡에 가장 중요한 원인은 부가적인 잡음이다. 이 논문은 잡음에 강인한 음성인식을 위하여, 스펙트럼 피크 향상 기법과 효과적인 잡음 차감 기법에 기초한 스펙트럼 보상 방법을 기술한다. 제안한 방법은 음성 스펙트럼의 포먼트 구조를 향상시키고 스펙트럼 기울기를 보상하면서도 광 대역폭 스펙트럼 요소는 그대로 유지한다. 백색 가우스 잡음, 자동차 잡음, 음성 잡음 또는 지하철 잡음에 의해 왜곡된 음성을 이용한 인식실험을 수행한 결과, 새로운 방법은 스펙트럼 보상을 하지 않은 경우에 비해, 높은 SNR(Signal to Noise Ratio) 환경에서는 평균 오인식율을 약간 줄였으며, 낮은 SNR(10 dB) 환경에서는 평균 오인식율을 1/2로 크게 줄였다.

• 한국소음진동공학회논문집
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• 제22권2호
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• pp.130-138
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• 2012

Environmental noise in the residential area is appeared with different types and features along with the growth of society. In particular when the economic level is raised up, the demand of residents for the environmental noise becomes more sensitive. The existing research on the environmental noise was initiated in the 1980's and resulted that the children's jumping sound was most annoying among the noises transmitted from the other unit. This result caused such activities that the researches were focused on the floor impact noise and that the laws in relation to environmental noise within residential area were revised strictly. This study aimed to survey the consciousness of residents for the environmental noise and to see how it is changed comparing with the previous one. Ultimately this result could be useful to establish the target for research or noise control to make the comfortable residential environment.

• 환경정책연구
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• 제14권1호
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• pp.113-134
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• 2015

2013년 전체 신규 주택 수요 중에서 아파트 등의 공동주택이 차지하는 비중이 89.9%이다. 이와 같이 공동주택의 다수의 세대가 함께 거주함으로써 이웃 간 층간소음에 관한 분쟁은 지속적으로 증가하고 있다. 한국에서의 층간소음 문제는 세계적으로 상당히 심각한 수준으로 국민의 약 88%가 층간소음 스트레스를 받고 있다. 한편, 정부는 층간소음 분쟁 완화를 위해 바닥두께 및 바닥충격음 저감성능 등과 같은 규제강화와 공동주택 단지별로 자체적인 해결을 유도하고 있다. 하지만 이와 같은 물리적 규제와 소극적인 관리정책으로는 층간소음 분쟁완화에 한계가 있다. 또한, 실내 정온한 생활환경을 위한 삶의 질을 향상시키기 위해서는 층간소음에 대한 건강영향이 고려된 정책마련이 필요하다. 따라서 소음노출에 따른 인체반응 연구사례를 조사하여 소음이 건강에 미치는 영향을 분석하였다. 이를 바탕으로 층간소음 노출기간에 따른 건강영향을 고찰하였다.

• 환경영향평가
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• 제18권1호
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• pp.21-30
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• 2009

The study show that things about the noise control are indicated at The Noise & Vibration Control Act and the other Act. Also, the details program and total government ministries' program for the noise control are indicated what are the advance noise control plan. The study consist of the four part which are "Draw up the environmental noise infrastructure plan; the install shall be done the noisemap & the automatic noise measurement devices", "Resetting of environmental noise standard at the application area and Introduce of indoor noise; the guide for region classification of the noise standard & indoor noise", "Setting of aircraft noise standard and Program of measurement point operation; the noise-assessment-standard shall change from WECPN to new index($L_{den}$, $L_{dn}$, $L_{Aeq\;24h}$) & the operation and control of aircraft noise measurement changes from local environmental office to central control center" and "The method of noise regulation at construction site and the plan on making of standard for vibration regulation; It shall be made that the guideline of construction noise should include a target-construction, noise standard etc & the ministries shall unify control about construction vibration of the blasting vibration". The advance noise-policy will improve efficiency to deal with civil appeal & damage on residents about noise.

• 한국환경보건학회지
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• 제45권6호
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• pp.668-674
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• 2019

Objectives: Modern people spend most of their day indoors. As the health impact of radon becomes an issue, public interest also has been growing. The primary route of potential human exposure to radon is inhalation. Long-term exposure to high levels of radon increases the risk of developing lung cancer. Radon exposure is known to be the second-leading cause of lung cancer, following tobacco smoke. This study measures the indoor radon concentrations in detached houses in area A of Chungcheongbuk-do Province considering the construction year, cracks in the houses, the location of installed detectors, and seasonal effects. Methods: The survey was conducted from September 2017 to April 2018 on 1,872 private households located in selected areas in northern Chungcheongbuk-do Province to figure out the year of building construction and the location of detector installed and identify the factors which affect radon concentrations in the air within the building. Radon was measured using a manual alpha track detector (Raduet, Hungary) with a sampling period of longer than 90 days. Results: Indoor radon concentrations in winter within area A was surveyed to be 168.3±193.3 Bq/㎥. There was more than a 2.3 times difference between buildings built before 1979 and those built after 2010. The concentration reached 195.4±221.9 Bq/㎥ for buildings with fractures and 167.2±192.4 Bq/㎥ for buildings without fractures. It was found that detectors installed in household areas with windows exhibited a lower concentration than those installed in concealed spaces. Conclusion: High concentrations of indoor radon were shown when there was a crack in the house. Also, ventilation seems to significantly affect radon concentrations because when the location of the detector in the installed site was near windows compared to an enclosed area, radon concentration variation increased. Therefore, it is considered that radon concentration is lower in summer because natural ventilation occurs more often than in winter.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 춘계학술대회논문집
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• pp.104-108
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• 2005

With the improvement of living quality, people's desire for quiet living environment keeps increasing. In particular, complaints about the noise emission by constrcution equipments around residential areas take most part of the noise related complaints. In this study, based on the European Directive/20n/14/EC, noise marking obligation system for the high noise construction equipment of Europe has been reviewed to implement the similar system in Korea.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.616-622
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• 2001

The road traffic noise becomes aggravated due to the rapid increase of motor vehicles. It has a great effect on the dwelling environment. Therefore we investigate the characteristics and sources of the motor vehicle noise through grasping the status of the motor vehicle noise. Traffic noise results from the collective contribution of the noise produced by individual motor vehicles. The motor vehicle noise varies enormously depending upon its type and mode of operation.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 II
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• pp.711-718
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• 2001

The tyre/road noise becomes aggravated due to the rapid increase of motor vehicles. It has a great effect on the dwelling environment. Therefore we investigate the characteristics and sources of the tyre/road noise through grasping the status of the tyre/road noise. Traffic noise results from the collective contribution of the noise produced by individual motor vehicles. The tyre/road noise varies enormously depending upon its type and mode of operation.

• 한국인터넷방송통신학회논문지
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• 제10권1호
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• pp.75-80
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• 2010

자동차 환경에서의 음성인식은 잡음처리가 매우 중요한 요소이다. 하드웨어 및 소프트웨어로 적인 접근방법으로 많은 연구가 되어 지고 있다. 하드웨어적인 방법으로는 Low-pass filter를 기본으로한 잡음처리 필터가 많이 연구되어 가시적인 성과를 보이고 있고, 소프트웨어적으로는 Noise canceler, 신경망 등 패턴인식 알고리듬의 연구가 이루어지고 있다. 본 논문에서는 시계열 패턴인식에 적용 가능한 알고리듬인 DTW(Dynamic Time Warping)를 자동차 잡음환경에 적용하여 그 음성인식을 위한 파라미터 패턴에 대한 매칭 레벨을 분류하여 잡음환경 적합한 패턴 매칭 레벨을 분석 하였다.

• 한국전자통신학회논문지
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• 제11권12호
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• pp.1159-1164
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• 2016

본 연구는 디지털위성중계기용 SHF 대역 저잡음증폭장치의 설계 및 구현에 대해 기술하였다. 잡음지수 최소화를 위하여 저잡음 증폭소자인 HEMT(: High Electron Mobility Transistor)소자를 적용하였고, 우주환경에 대한 사전 시뮬레이션 분석을 통하여 장비 오동작 가능성을 최소화 시켰다. 발사환경 시 발생하는 진동 및 우주방사능에 의한 TID(: Total Ionizing Dose)에 대한 시뮬레이션을 통해 신뢰성 있는 저잡음증폭장치를 설계하였으며, 제작 후 주요 성능지표에 대해 만족여부 확인 및 사전 성능 시뮬레이션 결과와 비교하였다.