• Title, Summary, Keyword: Noise Map

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A Study on the Selection of Measurement Point for Automatic Environmental Noise Measurement System (환경소음자동측정망의 측정지점 선정에 관한 연구)

  • Lim, J.S.;Lee, B.C.;Jeong, D.J.;Lee, M.H.;Yang, K.H.;Oh, Y.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.442-445
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    • 2007
  • A noise reduction policy can be more effectively made when automatic environmental noise measurement system is set up. However, the local characteristic of noise pollution requires a lot of measurement points. This study considers that automatic environmental noise measurement system connects with automatic air pollution measurement system and noise map. The measurement points of traffic volume by the National Police Agency and the Ministry of Construction and Transportation are investigated to use at drawing the road traffic noise map. Finally, the effective application method of the environmental noise measurement vehicle is discussed.

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Adaptive Noise Reduction Algorithm for an Image Based on a Bayesian Method

  • Kim, Yeong-Hwa;Nam, Ji-Ho
    • Communications for Statistical Applications and Methods
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    • v.19 no.4
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    • pp.619-628
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    • 2012
  • Noise reduction is an important issue in the field of image processing because image noise lowers the quality of the original pure image. The basic difficulty is that the noise and the signal are not easily distinguished. Simple smoothing is the most basic and important procedure to effectively remove the noise; however, the weakness is that the feature area is simultaneously blurred. In this research, we use ways to measure the degree of noise with respect to the degree of image features and propose a Bayesian noise reduction method based on MAP (maximum a posteriori). Simulation results show that the proposed adaptive noise reduction algorithm using Bayesian MAP provides good performance regardless of the level of noise variance.

Evaluation of Present Status for the Korean Noise Map Standardization (국내소음지도 표준화를 위한 현황 평가)

  • Park, In-Sun;Park, Sang-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.517-520
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    • 2005
  • Noise mapping covers the whole mapping process from the collection of raw data, storage and retrieval of the data for computation/modeling, to the presentation of information related to outdoor sound levels, sound exposure, noise effects or numbers of affected person. This presentation can be in either a graphical or numerical form. In Europe, the Directive 2002/49/EC of the European Parliament and of the Council relating to the assessment and management of environmental noise is now being implemented in the EU Member States. Here, The first maps for major areas are required by mid 2007, and action plans required one year later. These activities are repeated at five yearly intervals and all defined areas are incorporated in the following round of deadlines starting in 2012. The above are minimum requirements and some countries are expected to go further and faster. In this study, present status of domestic and international noise maps has been introduced to implemente the Korean noise map standard. This will help to get more convenient and, more fair result, and produce correct map at domestic level.

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A Study on the Computation and Application of Sound Power Level for Road Traffic Noise of Renewal Area (개발 예정지역 도로교통소음 음향파워레벨 산정과 응용에 관한 연구)

  • Kim, Deuk-Sung;Chang, Seo Il
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.6
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    • pp.635-644
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    • 2005
  • This paper is. a study on relation between road traffic noise(RTN) and sound power level(PWL). At present, many experimental formulae and prediction formulae are used for prediction of RTN. But these formulae are difficult to appiy to the metropolitan area because these formulae are inaccurate in the different condition from reference condition. This paper calculate RTN and PWL of each prediction formula, choose the best one and make a noise map of the subject area. Procedure is as follows. First, calculate $L_{eq}$ of RTN using experimental formulae and prediction formulae. Second, calculate PWL using $L_{eq}$ of RTN and distance attenuation for point source at semi-free field. Third, choose the most accurate formula. And finally, make a noise map of the subject area at present and future. The result using noise map will be able to apply to application field. Noise mapping tool used on this paper is Raynoise program using Ray Tracing Method(RTM), Mirror Image Source Method(MISM) and Hybrid Method(HM).

A Study on the Prediction Model of Railway Noise Using Noise Map (소음지도를 이용한 철도소음 예측식의 연구)

  • Park, Chan-Youn;Park, In-Sun;Oh, Jong-Hwa;Lee, Jae-Won;Park, Sang-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.882-886
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    • 2007
  • People living in the large cities are exposed to high level noise due to road-traffic, railway-traffic and aircraft. Nowadays, some researches are ongoing to reduce the noise by using noise map. However it has to be decided which prediction model is the most suitable in Korea. In this study, it has been focused on railway noise prediction models which are employed in a commercial software(Sound Plan) and developed by Korea Railroad Research Institute, and comparative study of the prediction models has been made.

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Noise Evaluation of Turbo Fan Aircraft(C525) in the Airfield (비행장에서의 터보 팬 항공기(C525) 소음 평가)

  • Kim, Woo-Jin;Ryu, Jong-Hyeon
    • Journal of the Korean Society of Mechanical Technology
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    • v.20 no.5
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    • pp.691-696
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    • 2018
  • Noise is unwanted sound and nerve jarring sound or mentally and physically harmful sound to the human body. In the 20th century, the aviation industry have been comprehensive industry of all areas and humanity have been globalized, the number of aircraft operated have been increased continuously. We confirmed that the actual measured noise data was consistent with the aircraft average noise data to calculate noise maps of INM version 7.0. and based on this, the actual flight scenarios and the noise map were created. For making the noise map, we assumed that the maximum number of flight is operated.

Experimental Study of the Refrigerant Induced Noise for Air Conditioner Using Flow Pattern Map (유동 양식 선도를 이용한 에어컨 실내기의 냉매 소음 저감 분석)

  • Han, Hyung-Suk;Mo, Jin-Yong;Jeong, Weui-Bong
    • Proceedings of the SAREK Conference
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    • pp.957-963
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    • 2008
  • The refrigerant-induced noise of the air conditioner is one of the irregular noises which occurs at the indoor unit. Because the air-conditioner makers are always trying to reduce the sound pressure level radiated from indoor unit, reducing the refrigerant-induced noise at low cooling mode is very important problem. But it is very difficult to estimate whether the refrigerant-induced noise occurs or not before it becomes problem. In this paper, a method to predict the refrigerant-induced noise is suggested using flow pattern map. It is estimated that the irregular noise from the refrigerant comes from the slug flow in a pipe.

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A Study on the Application of Noise Map in Urban Planning (도시계획에서 소음지도 활용방안 연구)

  • Ko, Joon-Hee;Chang, Se-Il;Lee, Seung-Il;Yi, Chang-Hyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.905-910
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    • 2005
  • Increasing population in the cities, it has been demanded that urban planner should consider environmental problem. In this regard compact city has been strongly suggested as an environmental urban form which can reduce energy consumption. However, compact city can also cause noise problem, because residential buildings have to be located near roads and railways. In order to solve this problem, it is necessary for urban planner to examine the types of roads and railways before they are established. Noise map is able to be useful tool for the task.

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A Study on The Improvement Effects of Road Traffic Noise by The Noise Barrier Facilities Using a Noise Map Simulation (소음지도를 활용한 방음시설별 도로교통소음 개선효과에 관한 연구)

  • Jeong, Jea-Hun;Park, Jin-Ho;Kwon, Woo-Taeg;Kim, Hyung-Chul
    • Journal of Environmental Impact Assessment
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    • v.17 no.4
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    • pp.213-224
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    • 2008
  • Since 1970's rapid urbanization and economic growth, the population was highly increased and residential type was changed from single detached house to high density and high-rise apartment. Recently more high-rise residential building generates more traffic volumes and it makes spatial concentration. The highly traffic volumed road and high residential building was constructed nearby, it occurs noise problem. The purpose of this study is comparing the performance of three type noise barrier between noise source and receiver using a noise map simulation. Three types were composed as road side planting trees, building side planting trees and noise barrier wall. Planting trees is less effective than noise barrier wall as a noise barrier. And they are all effective under 3 stories than over 5 stories, especially noise barrier function can't work over 5 stories.

Generation of a City Spatial Model using a Digital Map and Draft Maps for a 3D Noise Map (3차원 소음지도제작을 위한 도화원도와 수치지도를 이용한 도시공간모델 생성)

  • Oh, So-Jung;Lee, Im-Pyeong;Kim, Seong-Joon;Choi, Kyoung-Ah
    • Korean Journal of Remote Sensing
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    • v.24 no.2
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    • pp.179-188
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    • 2008
  • This study aims for generating a city spatial model required for the creation of a 3D noise map. In this study, we propose an efficient method to generate 3D models of the terrain and buildings using only a digital map and draft maps previously established without using any sensory data. The terrain model is generated by interpolating into a grid the elevation values derived from both the contour lines and the elevation point of the digital map. Building model is generated by combining the 2D building boundaries and the building elevations extracted from the digital map and the draft map, respectively. This method has been then applied to a digital map and three sets of draft maps created in the different times. covering the entire area of Yeongdeungpo-gu. The generated city spatial model has been successfully utilized for the noise analysis and the 3D visualization of the analysis results.