• 한국재료학회지
• /
• 제19권7호
• /
• pp.382-385
• /
• 2009

Efforts to reduce noise in industrial application fields, such as automobiles, aircrafts, and plants have been gaining considerable attention while a sound proof wall to protect people from the noise has been intensively investigated by many researchers. In this study, our research group suggested creating a new sound proof wall composed of scrap aluminum chips and perforated plates in a commercial polyester sound proof wall, which was then successfully fabricated. This wall's sound absorption characteristics were measured by an impedance tube method. The sound absorption property was evaluated by measuring the Noise Reduction Coefficient (NRC) to the standard, ASTM C 423-90a. The noise reduction coefficient of the sound proof wall composed of 3.5 vol.% and 7.5 vol.% of scrap aluminum chips relatively increased to 5% and 8% compared to the commercial polyester sound proof wall. The scrap aluminum perforated plate also relatively increased to 13% compared to the commercial polyester sound proof wall.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2014년도 추계학술대회 논문집
• /
• pp.125-130
• /
• 2014

High speed railroad car and high-rise apartment with development of railway technology cause different problems of noise contrary to the previous generation. It is the most efficient noise reduction countermeasure but we studied that is the way on noise propagation with sound proof wall or sound proof tunnel around railroad. But if it were railroad on bridge, additional cost which is more expensive than installing one on the ground is needed. So sound insulation material considering reducing weight of recent soundproof facilities must be selected. It is in this study that predicted and analyzed acoustical and structural effect for noise reduction by installing soundproof tunnel. If it were departmentalized into additional study, could be able to expect noise reduction effect of sound proof tunnel establishment on the bridge.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2009년도 추계학술발표논문집
• /
• pp.100-102
• /
• 2009

Effect of temperature, pH and soil depth on germination of Dianthus chinensis, Dianthus barbatus, and Perennial pennant were investigated in growth chamber and soil condition at the ratio of 7:3 (natural soil and organic soil) in laboratory condition. the optimum temperature for seed germination was recorded for $20^{\circ}C-\;25^{\circ}C$. Maximum germination was observed for Dianthus barbatus (76%) where as in soil condition Perennial pennant (51%) showed maximum germination at 1 cm soil depth. Similarly, optimum pH for seed germination was at pH 6 in all the species. So in lower pH (at pH4) seed germination was inhibited. Germination of these selected species at different environmental condition help to construct the ecological sound proof wall to mitigate the noise especially in urban areas.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 추계학술대회 논문집
• /
• pp.529-544
• /
• 2007

After rapid running is begun in domestic, problem by the train gust that was not considered at existent train running appeared. If the High-Speed railway business speed rises by 350km/h in the future, is going to become more big problem. This study conducts an experiment that measure in local about KTX train beside Gyeong-Bu High speed railroad track about aerodynamics effect that happen by passage of train and analyzed. In case KTX II runs with the 350km/h speed, forecasted effect that get in the simple vertical surfaces parallel to tracks according to distance from rail center. Compared construction size with structural analysis in case do not consider with case that consider the train gust about sound proof walls representatively. As a result, proposed wind load standard that apply at sound proof walls design.

• 한국분무공학회지
• /
• 제21권3호
• /
• pp.162-169
• /
• 2016

When we construct a road near an apartment complex, we consider a soundproof wall. To make residential places quieter, we may consider a soundproof road tunnel. Such a tunnel, however, would become highly concentrated with soot from vehicles whenever a traffic jam might occur. To create an optimum design, this study utilizes the PHOENICS-VR software. The work considers three cases: (1) no openings (2) openings at 30m intervals, and (3) openings at 60m intervals on the upper side of the tunnel. The study finds that in the second case shows CO concentration distributions were 15% less than those without openings. And the CO concentration distributions of the second and third cases are almost the same. The findings suggest that we should make the soundproof tunnel to reduce construction fees.

• 한국산학기술학회논문지
• /
• 제10권3호
• /
• pp.607-612
• /
• 2009

생태방음벽에 있어서 구조도 중요하지만, 식물종자의 발아와 생장율을 고려한 선택도 매우 중요하다. 재래종과 외래종 35종을 선발하여 온도 $24^{\circ}C$, 습도 60%, 그리고 12시간 주기로 낮과 밤을 조절하였고, 식생기반재로 일반토양과 유기물 토양의 비율을 6:4, 7:3, 8:2, 9:1로 하여 실험하였다. 실험한 종 중 8종은 2주 동안 발아하지 않았지만 그 외 나머지 종들은 시간차를 두고 모두 발아하였다. 가장 발아율이 좋은 종은 Perennial penant(92 %)이고 다음은 Brassica napus(86%), 그리고 Silene armeria(82 %) 순으로 나타났다. 본 연구에서는 발아한 종의 뿌리 및 줄기의 길이를 측정하여 분석하였다. 이번 연구에서 뿌리의 생장이 가장 좋은 3종 Perennial penant, Perennial sonata Rebolsentri가 생태방음벽 개발에 가장 적합한 종으로 사료된다.

• 한국음향학회:학술대회논문집
• /
• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
• /
• pp.662-667
• /
• 1994

This paper presents the design and construction details of a soundproof enclosure for housing 20 KVA diesel generator-set. As the generator had to be installed close to the hospital building, it was desirable to reduce the transmission of noise by housing the generator in such an enclosure. The diesel engine being an air cooled one, it was essential to supply fresh air into the enclosure for its cooling. Forced inflow of air is provided through an inlet duct located in such a way that the incoming fresh air is thrown close to the inlet of cooling fan of the engine. The high velocity air stream, which heats up while passing over the engine head, escapes to the atmosphere through a rectangular outlet duct with enlarges inlet that receives hot air from the engine. The air ducts were designed specially and have been provided with acoustic lining for sound absorption. The masonary enclosure has been provided with double glazed fixed windows and double doors. The exhaust pipe of the engine fitted with a muffler has been taken out through the enclosure wall facing away from the hospital. Acoustic performance studies conducted in terms of attenuation provided by the enclosure at different frequencies have also been presented and discussed. The noise control measures adopted for building the sound-proof enclosure have been found to be quite effective as the noise levels inside the hospital building are now within the acceptable limits.

• 한국산학기술학회:학술대회논문집
• /
• 한국산학기술학회 2010년도 춘계학술발표논문집 2부
• /
• pp.1101-1104
• /
• 2010

실험에 사용된 식생기반재는 일반토양, 비료, 인공토양을 혼합하여 사용하였다. 기반재는 식물이 뿌리를 발생시켜 착근하는 과정초기에 필요한 비료성분을 즉각적으로 공급하는 화학비료와 장기간에 걸쳐 공급하는 유기물 비료로 구성되었다. 식생기반재 발아실험에 이용된 36종의 종자들은 균일하게 도포한 후 1cm 정도 배합토로 덮어 주었다. 본 실험에서는 배합토의 주성분인 일반토양과 유기물의 비율을 8:2로 하여 실험하였다. 또한 식물의 활착과 피복율을 높이기 위해 Seed Spray를 이용하여 다시 한 번 종자를 분사하여 실험하였다.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2005년도 학술대회 논문집
• /
• pp.201-205
• /
• 2005

도로조명은 야간에 운전자에게 안락함과 안전한 운행을 도울 수 있도록 설치가 이루어져야한다. 최근 늘어나는 자가용에 의해서 주택가나 공공장소에 발생하는 소음을 감소시키기 위하여 도로 위 필요지점들에 방음벽이 설치되어지고 있다. 그러나 현재 이에 적합한 형태의 조명기구가 개발되지 못한 상황이며, 이에 따라서 방음벽에 설치가 가능한 도로조명기구의 반사판을 개발하였다. 개발된 반사판은 도로에 대해 연직방향으로 위치한 방음벽에 그대로 설치되어질 수 있는 형태이며, 도로조명기준에 맞추어 전반 균제도 0.4와 차선 축 균제도 0.7 이상을 만족할 수 있도록 설계되었고, 단위 면적당 소비전력 $1.18[W/m^2]$의 효과를 얻었다.

• 한국환경복원기술학회지
• /
• 제9권2호
• /
• pp.59-71
• /
• 2006

Due to the rapid process of industrialization the cities of Korea confront changes of climate, destructions of the habitate and decrease of the green. Recently Seoul and other local governments have implemented policies and projects to improve the environmental surroundings. In reality, however, those policies and projects face difficulties in the course of implementation. The fact that there are no concrete regulations and specific legal procedures turns out to be one of the main difficulties. The aim of this study is to present specific plans and methods of wall-planting and to provide basic guidelines for the future direction of wall-planting and offer ideas of facilitating wall-planting. This study is based on questionnaires from specialists of landscape architecture through individual interviews and/or e-mails. The questionnaire is consisted of following 4 sections. 1. Show the experts current regulations and/or legal procedures and ask them improvements and suggestions. 2. Ask them choose matters of the highest priority by using Ricardo's diagram method. 3. Ask them to make a graded list in terms of the location and method of wall-planting. 4. Study the maketability of the wall-planting products currently in circulation. The city of Seoul and the Ministry of Environment recommend that trellis and/or planting inducement structures be installed on the building wall by regulation. The specialists responded to the questionnaire advocate that green wall without trellis should be allowed as green zone. Therefore regulations concerning the wall-planting should be determined specifically according to the characteristics of individual plants and walls. It has been urged that legal aid and social support must be reinforced to establish rules dealing with wall-planting. The respondents also point out that significant cutting down of the tax is far more effective in accelerating the wall-green instead of administrative support. The highest priority in terms of planting has been given to sound-proof wall, retaining wall and building wall. Concerning the maketability of the wall-planting products, panel products are recommended for early-planting and building planting. It has been suggested that the research and study of new materials and species be done in advance.