• 한국방사선학회논문지
• /
• 제12권3호
• /
• pp.335-341
• /
• 2018

의료수준의 향상과 더불어 환자들의 첨단의료장비에 대한 기대수준이 증가하고 있으며 특히 자기공명영상(Magnetic Resonance Image : MRI)은 현재 모든 임상 분야에서 가장 핵심적인 영상진단 도구로서 사용되고 있다. 그러나 검사 중에 발생하는 심각한 소음으로 많은 환자가 심리적인 불안을 경험한다고 한다. 이에 본 연구에서는 자기공명영상검사실의 기존 헤드셋 흡음재에서 차음재를 추가한 헤드셋의 소음저감평가와 차음재별 영상 아티팩트(artifact) 유무를 알아보고자 하였다. 3D 프린팅한 헤드셋 내부에 흡음재(스펀지)와 차음재(아크릴판, 구리판, 3D copper plate)를 교차 배열하여 MRI 검사소음을 녹음하여 스피커로 같은 dB 값의 소음을 발생시키며 3D 프린팅 된 두부모형의 내부에 소음측정기로 dB 값을 측정하여 정량분석을 하며 자체 제작한 헤드셋을 물팬텀에 밀착시킨 후 MRI영상 아티팩트 유무를 검사한다. 드셋의 정량평가를 한 결과, 헤드셋 평균 dB 값은 81.8 dB로 나타났으며, 차음재를 추가한 헤드셋에서 가장 방음효과가 뛰어난 재료조합(구리, 아크릴판, 스펀지, 스펀지) 헤드셋의 평균 dB 값은 70.4 dB 값이 측정되었지만 MRI 시뮬레이션 결과 구리가 반자성체이기 때문에 아티팩트가 나타나 배제하였고 두 번째로 방음효과가 뛰어난 (스펀지, 아크릴판, e-copper plate, 스펀지) 헤드셋의 평균 dB 값은 70.6 dB 값이 측정되었고 MRI 시뮬레이션 결과 인공물 나타나지 않았다. 구리분말이 약 40%가 포함된 e-copper PLA로 출력한 재료를 동일하게 시뮬레이션을 한 결과 인공물 나타나지 않았으므로 3D 프린팅 재료의 사용이 적합하였고 구리보다 경제성이 우수하며 가공이 용이하므로 적합한 재료로 선정하였다. MRI관련 연구에 있어 3D 프린팅을 이용한 상호발전이 매우 기대된다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 심포지엄 논문집 정보 및 제어부문
• /
• pp.141-142
• /
• 2008

Hearing loss is the most common birth defect among infants. Yet most hearing-impaired children are not identified until 1 to 3 years of age - which is well beyond the critical period(6 month) for healthy speech and language development. However, if a hearing-impairment is identified and treated in its early stages, child's speech and language skills will be comparable to his or her normal- hearing peers. For these reasons, hearing screening at birth and routinely throughout childhood is extremely important. Auditory brain-stem response(ABR) is nowadays one of the most reliable diagnostic tools in the early detection of hard of hearing. In this study, we developed the system that detects auditory evoked potential using micro-processor. Furthermore, it is required to develop a portable system to measure in not only soundproof room but also nursery for infants.

• 환경영향평가
• /
• 제18권2호
• /
• pp.89-97
• /
• 2009

Korean society is faced with various new problems arising from the development projects of new towns, industrial cities, large-scale residential complexes, etc. started from the 1970s. Particularly with the construction of residential and industrial complexes by the roadsides, they are openly exposed to road traffic noise and vibration. Thus, the objective of this study is to examine using noise maps how increasing traffic volume affects road traffic noise and what problems it causes in areas where new towns or complexes are constructed by development projects. According to the results of this study, in areas around the sites of development projects, the noise level increased by road traffic noise compared to that before development and was 1.16~6.92 times higher than the environmental noise standard, but measures to reduce road traffic noise was lukewarm. In addition, areas with soundproof facilities showed a noise level 1~3 step lower than other areas, and in individual buildings, the noise level on the side facing the road was 1~2 step higher than that on the rear side.

• 한국소음진동공학회논문집
• /
• 제20권8호
• /
• pp.742-752
• /
• 2010

In case of the working machine that using in the loud-noisy workplace, as it generates the loud-noise, it is influencing a physical, mental bad effect to those workers. Accordingly, though the noise countermeasure for the loud-noisy workplace is acutely requiring, until now, those methods that wearing the soundproof-protection tool, or restriction the working hours, and minimize the noise exposure volume, were mainly used. However, such noise countermeasures occur many problem points. On such point of view, using the acoustic simulation technique, let the workers to choose the workplace where suffering many damages due to the noise of working machine, and after grasp the physical property of working machine and indoor acoustic characteristic, this Study has attempted to grasp the reduction degree of noise level at before-improvement?after-improvement, through the sound-absorption measure. Passing through such preceding step, using auralizational technique based on the noise of working machine of before-improvement after-improvement, and by conduct psycho-acoustics evaluation, this study intended to investigate the change degree of subject reaction. As the result of evaluation, it is considering that the noise-reduction countermeasure method for the loud-noisy workplace could be much effective, through the sound-absorption measure.

• 감성과학
• /
• 제7권4호
• /
• pp.51-56
• /
• 2004

본 연구의 목적은 각각의 색채 자극 하에서의 생리신호를 측정하고자 하였다. 실험에 사용된 색채는 빨강, 노랑, 녹색, 파랑, 보라, 그리고 백색을 사용하였다. 실험은 방음 암실에서 이루어졌으며, 건강한 성인 남, 여 30명을 대상으로 하였다. 생리신호의 측정은 뇌파와 심전도를 측정하였다. 뇌파의 실험결과는 차가운 색 계통의 색채에서 $\alpha$파의 상대 전력비가 증가한 것을 볼 수 있었다. 또한 심전도의 HRV 분석 결과도 차가운 색 계통에서 HF/LF의 비가 증가한 것을 볼 수 있었으며, 이 결과로서 색채 조명이 인체의 감성변화에 영향을 미치는 것을 알 수 있었으며, 이 결과를 활용하여 색채 환경 설계에 도움을 줄 수 있으리라 사료된다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2007년도 추계학술대회논문집
• /
• pp.488-492
• /
• 2007

Since Equipment-Noises occurring in machine room penetrate wall-body and travel to the adjacent room in the form of air-borne sound and structure-borne sound, it is appearing as the main factor that injures a peaceful residential environment, and due to this, such noise-damage is currently increasing rapidly. Consequently, despite the measures for sound-insulation and soundproof against the equipment-noise penetrated wall-body is urgently required, but as the subjective evaluation considered for psychological response about the equipment-noise was not practiced, many dissatisfactions are still raising even after some measure was taken. On such point of view, this Research, at the spot, has actually measured the equipment-noise that had permeated various wall-bodies, and examined its physical characteristics, thence based upon this, has conducted Psycho-Acoustics Experiment and investigated the interrelation between the physical evaluation value and psychological reaction value. It is considered that such study result could be utilized as the useful material at the time of establishment of the Grading Standard for the insulation performance against the Architectural Plumbing Noise, in the future.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.202-205
• /
• 2005

The purpose of this work is to identify the characteristic of eye movement for visual training of the elderly. This investigation is to examine the relationship between the head and the eye motor system for the localization of visual target direction in three-dimensional space. All experiments were performed in a soundproof chamber. Twenty-one red LEDs (Light-Emitting Diode, Brightness: 20cd/$m^2$) arrayed in three lines on a half circle-surrounding panel are used. LEDs are horizontally 30 degree apart and vertically 20 degree apart from each other. The condition of stimulation is random and anti-saccade. Physiological parameter such as EOG (Electro-Oculography) was measured by BIOPAC system. We measure the mean latency time, which is the time from the start of visual stimulation to the response of the human body. The result shows that the mean latency time is short in the case of the condition of anti-saccade, the fixed head and a quarter visual stimulation. This finding can be used in developing programs for various visual improvements for the elderly by analyzing the characteristic of eye movement.

• 설비공학논문집
• /
• 제19권6호
• /
• pp.476-484
• /
• 2007

Recently, in accordance with the buildings are becoming to large-sizes, high-stories, the large scaled facilities and equipments in machine room are quite demanding, and the generated noise volume according to this situation is on increasing. Since such noise is becoming to the object of a serious civil appeal, it is the real situation that a reduction countermeasure against the machine room equipment noise is keenly necessitated. On such viewpoint, this study has recorded, measured the noises which were generated from each individual as same as the whole equipped machines and tools, on the object of the dormitory machine rooms of the 3 colleges that haying mutually different peculiarities, then after grasp-ing their characters and acoustic powers, this research has verified its prediction possibility and the authenticity by comparison the estimated numerical value with the actually measured numerical value through the acoustic simulation. After grasping the prediction possibility in such way, by utilization of the sound absorption material in the machinery room, from the stage of design, the soundproof measures for the noise reduction at machine room could be regulated effectively, and it is also considered that such data would be utilized as the fundamental material for an establishment of the measure for sound insulation.

• 한국주거학회논문집
• /
• 제22권1호
• /
• pp.25-33
• /
• 2011

With the recent increase in the number of foreign settlers in our country, a societal system is needed which they can adapt to more easily. The results of the study were as follows. First, from the result of analyzing the 171 programs of the multi-cultural family support system, it could be seen that in order for the marriage immigrants to more successfully adapt, various programs are needed. Second, when the study had an interview with 13 marriage immigrants from China, Vietnam and Philippine about their adaptation to residential environment, they had a high satisfaction with their residential environment when their spouses' educational level was high. In, they appraised that South Korea was superior to their native land in scale and facilities of buildings and the buildings of their native land were superior to those in South Korea in terms of soundproof applications, natural lighting and ventilation, which were indoor environmental elements. Third, they were generally satisfied with their residential environment. However, they stated that it took 6 months~ two years to adapt to the Korean residential environment because of the differences in the residential environment compared to their homeland. A based on the research result, the housing adviser is necessary in the marriage immigrants.

• 한국주거학회:학술대회논문집
• /
• 한국주거학회 2009년 춘계학술발표대회 논문집
• /
• pp.137-142
• /
• 2009

The purpose of this study is to collect baseline data about the demands for housing regeneration of the permanent rental apartment dwellers. Self-administered questionaires and interviews were provided to 144 dwellers in Incheon Man-soo 7 complex from 2008 December 29th to 31st. The collected data was used to conduct comparative and descriptive statistical analysis: frequency, t-test, and $X^2$-test. The main findings are as follows : 1. House repairing and papering is most common used service by respondents. They also have much need for economic support. 2. Residents were satisfied with general environment of house. This survey showes that the highest satisfaction was about using food waste disposal sites. and the lowest satisfaction was about soundproof facilities on the other hand, among the questions. 3. Dwellers wanted to remodeling such as bathroom, restroom, a flower garden, space of landscape architecture. More than half dwellers preferred to leave among themselves living at permanent rental apartment as it is. 4. There is important difference in the demands of housing regeneration as the family trait. and variables of those were nuclear family or elderly/handicapped-family.