• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.979-981
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• 2006

Recently as the well-being diffuse and the living standard improves. People's demand for an environment lifestyle is gradually on the rise. The major source of the subway running train is rolling noise generated by the surface condition of wheel and rail. In this study, we research trends on the reduction noise level. Further-more, special traffic Ubiquitous helps to environment technical development.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2007.04a
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• pp.597-602
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• 2007

It is proposed to analyze the vibration of slab with MTMD and vibration-induced noise. Substructure synthesis is introduced to develope the interaction between the slab and MTMD which are defined in different space and acoustic power is obtained from the velocity field of slab. Numerical analysis is performed to show that the vibration and noise of slab can be reduced by MTMD. A living room of wall type apartment including the wall and MTMD is modeled and analyzed by FEM program Numerical analysis shows that the vibration and noise control effect is different depending on the location and mass ratio of MTMD. Futhermore, noise is more effectively reduced when the vibration of higher modes of slab are reduced rather than lower modes.

• Journal of Environmental Impact Assessment
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• v.22 no.4
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• pp.361-367
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• 2013

Noise and vibration occurs during construction intermittently, but with the most arise complaints. There is a need to efficiently manage the construction noise and vibration problems because in case a residential facility that requires calmness around the construction site adversely affects the living conditions of nearby residents. The ministry of environment has mandating the installation of soundproofing facilities for the management of construction noise. In order to enforce a particular construction, the mandatory install with soundproofing facilities before the start of construction, and after construction. However, Installation guide of soundproofing facilities for construction sites were not considered affected areas by noise and there is no provision of performance evaluation for soundproofing facilities. In this study, investigated the status and problems of the installation guide for soundproofing facilities in construction sites, we propose an efficient installation guide of soundproofing facilities for the reduction construction noise.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.27 no.1
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• pp.5-13
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• 2017

Noise complaints among neighbors in apartment building are mainly caused by floor impact noise that is structure born noise due to occupant induced floor vibration. To control this noise problems many researchers have investigated floor systems and finishing materials. Light-weight impact noise affects by finishing materials, but heavy-weight impact noise induced by heel impacts during normal walking or jumping of children is concerned with structural system and floor vibration. To figure out the characteristics of floor impact noise and transmission of floor vibration due to human activities, vibration tests were conducted in apartment buildings. Impact hammer, heel drop and walking activities were loaded at center of upstairs living room, and accelerations of slabs for both upstairs and downstairs and sound pressure levels for downstairs were measured. The acceleration ratio of transmitted floor vibration to downstairs and human induced vibration in upstairs was between 0.5 and 1.0 according to slab size, wall, and load type. And floor impact noise occurred in the range of natural frequency of slab.

• Korean Journal of Human Ecology
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• v.1 no.2
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• pp.61-74
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• 1998

The purpose of this study is to investigate residents subjective opinion of the noise on the low-rise multifamily house in U.S.A. The results of this study can be applied for the prevention of noise when planning cities, roads, and multifamily houses in Korea. The subjects of this study are three kinds of multifamily houses and their 109 residents in Athens, U.S.A. The results of this study are as follows. The residents felt the noise from lawn mowers and the sound from filter fans of air conditioners were higher than in the other external noise. The residents daily activities were disturbed a little by the external noise. Of the internal noise, the air home sound was recognized a little by residents. They only felt a moderate sound level from the building services of the solid borne sound. They suffered worse from noise in the summer and they felt worse from 16∼20 o'clock due to noise. The residents who were living in town houses felt better than those in the other multifamily houses. (Korean J Human Ecology 1(2):61∼74. 1998)

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2000.06a
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• pp.927-932
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• 2000

Recently, construction vibration has caused annoyance for a number of dwellers in nearby construction field and that induced from operating of large construction equipment, has become a very serious issue in our living environment. But, construction vibration standard of our living environment. But construction vibration standard of our country is efficient. Especially, directly blow method(diesel piling method, oil pressure method, etc) has caused much problems of highly impactive vibration. Construction works, in order to solve these problem, will be used SIP(Soilcement Injected Precast Pile) method of low vibration equipment. In this point, this study attempts to survey on the characteristics of piling vibration by SIP method for various earth conditions in construction field. And this study intends to get the basic data to establish a standard about construction vibration.

• Journal of the Korean Home Economics Association
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• v.42 no.4
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• pp.85-98
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• 2004

The aims of this study was to provide information of sites to potential buyers and apartment builders through a comparative investigation on the urban criteria in 5 disDicts of Usan city Mugeo, Daun, Guhwa, Guyoung, and Cheonsang. The content analysis method was used to determine the urban factors which reviewed the urban and environment plan legal system and contents of plans which analyzed the housing characteristics in Ulsan city. Also utilized were professional's opinion and various emphasized elements such as the location of apartments through newspaper advertisement from 1990 to 1999. The urban evaluation factors used in this study were degree of air and noise pollulion, traffic facilities, land use, living environment and economics. Major findings are as follows: Mugeo area has the most convenience community facilities, Guyoung and Cheonsang areas have excellent natural environment-air and noise pollution.

• KIEAE Journal
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• v.9 no.5
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• pp.63-68
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• 2009

As with the disappearance of a living room window due to the trend in apartment housing construction that prefers a larger, expanded living room, the sound insulation performance of the balcony window is becoming an important factor to determine the level of indoor noise at an apartment unit. Considering that the indoor noise inside an apartment unit is mandated by law at or below 45dB(A), the balcony window is increasingly assuming an even more important role. Sound insulation performance of the window was measured by examining differences in data involving varying angles of incidence of the sound source as obtained from the same balcony window. Also, acoustic intensity measuring was performed at and around the window to determine its sound insulation quality. Results of measuring on the sound source's angles of incidence indicated that the performance showed some differences in lower frequency ranges, though with no significance. Intensity measuring results showed that the sound insulation performance was reduced near the connection part of the window and the window frame.

• Journal of the Korea Society of Computer and Information
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• v.21 no.3
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• pp.91-96
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• 2016

We have surrounded undesired living noises in our life. One of biggest noises coming out of range hood during cooking in the kitchen. A range hood is one of the most important appliances in the kitchen because it ventilates polluted air out during cooking, and maintains air quality in the kitchen. But current kitchen range hoods bring up some issues; First, the range hoods consume massive amount of standby power not in use condition. Second, current models have designed manual fan operating system with sudden onset of noise with starting. In this paper, we propose an auto control system entire processes from air ventilation to noise reduction. Our system is consist of three parts (Eco-sensors pack, Main Controller and Active Noise Controller); Eco-sensors pack detects air pollution of kitchen areas and sends the detection values to Main Controller. Main Controller determines operation of range hood by detected values. Active Noise Controller is located inside of the range hood. It received starting signals from Main Controller which elicits degrees of polluted air condition and fan operating speed from 1 to 3. Once Active Noise Controller detected the signals, it runs a ventilating fan until new value from Main Controller becomes 0. while the range hood works, A noise cancellation algorithm inside of Active Noise Controller become activated to reduce levels of noise. As a result, the proposed system clearly shows reduction in power consumption include standby power and decreases in levels of noise.

• Korean Institute of Interior Design Journal
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• no.14
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• pp.42-54
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• 1998

This study aims to analyze needs for living space of residents in a farming retirement community In this study a survey was performed about desire for living space and aesthetic aspects of housing environment. Results of the study are as follows; 1. Most residents desire permanently formed dwelling unit rather than assembled temporary structure so that they comfortable in noise-prevented space. 2 The retirement community residents do not desperately prefer individually separated room because open space provides better observsation function for emergencies. 3. They hope their dwelling units are grouped like regular neighborhood and the units have traditional designs such conventional kitchen and sink and wooden floor. Finally in this study it is proposed that Korean rural retirement community be established with maximum use conventional dwelling resources so that the residents benefit old fashioned living tradition even in the recently moved retirement society.