• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2003년도 추계학술대회논문집
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• pp.923-927
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• 2003

The aim of this study is to investigate the characteristics and quantity of the noise reduction by pipe material, wrapped pipe with glass wool and installed pipe height The characteristics of noise emission from drain-pipes is as follows. The noise reduction pipe in PVC can reduce noise levels in 7-10㏈ and the cast-iron pipe can reduce in 14㏈compared with the normal PVC pipe. In these days, the glass wool was used for preventing the burst and the noise reduction. But the glass wool for wrapping pipe is not effective to the noise reduction. The characteristics of noise emission from various installed pipe height were measured As the ceiling space of the remodeled building was raised, the noise level was troubled by increasing of the vertical pipe length.

• 한국지열·수열에너지학회논문집
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• 제8권1호
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• pp.1-6
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• 2012

This study aims to analysis domestic energy consumption in Korea and reduction greenhouse gas by building mechanical system. At this point be tormented the energy depletion and climate change of earth are big problems on the eatrh. In this paper we will find out best methods to reduction greenhouse gas and energy consumption by practical building mechanical system. Enlargement of greenhome and building adopt, greenhouse gas exhaust reduction in building, publication of energy consumption rate, publish building energy management manual, etc.

• E2M - 전기 전자와 첨단 소재
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• 제8권6호
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• pp.721-726
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• 1995

In this paper, reduction characteristics of NOx gas produced from diesel engine combustion is studied by using pulse corona discharge. Nox concentration of 1900ppm (NO 1870, NO$\sub$2/ 30 ppm, N$\sub$2/ balance gas) was controlled in a fixed quantity of 280ppm, using a flow meter. Reactors are composed of cylinder type. NOx reduction rate is investigated with discharge electrode diameter[0.5,1,3,4.phi.], reactor length [130,300mm], reactor materials[Copper, Poly Vinyl Chloride] and Input voltage[DC, AC, DC Pulse square voltage]. In the result, NOx reduction rate is the best of all in copper reactor, small electrode diameter[0.5.phi.], DC pulse voltage and long reactor[300mm]. Then Teduction rate of NOx is about 93%.

• 한국건축시공학회지
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• 제3권4호
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• pp.123-128
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• 2003

The purpose of this study is to analyze the efficiency of the noise reduction measure in the downtown construction. For decades, the life level rise in Korea makes the environmental issues developed the important issues. Specially the noise problems have become the hot issue in the building construction. This study covers the efficiency of the measures, which is used in the construction field to reduce the noise. The case was obtained by Korean E＆C company in 2003. It is used as important sources. The results of this study are as follows; the reduction efficiency is higher than that of the old measure. But more efforts are needed to comfort nearby residents.

• International Journal of Computer Science & Network Security
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• 제21권3호
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• pp.31-36
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• 2021

RNA sequencing (RNA-Seq) is a technology that facilitates transcriptome analysis using next-generation sequencing (NSG) tools. Information on the quantity and sequences of RNA is vital to relate our genomes to functional protein expression. RNA-Seq data are characterized as being high-dimensional in that the number of variables (i.e., transcripts) far exceeds the number of observations (e.g., experiments). Given the wide range of dimensionality reduction techniques, it is not clear which is best for RNA-Seq data analysis. In this paper, we study the effect of three dimensionality reduction techniques to improve the classification of the RNA-Seq dataset. In particular, we use PCA, SVD, and SOM to obtain a reduced feature space. We built nine classification models for a cancer dataset and compared their performance. Our experimental results indicate that better classification performance is obtained with PCA and SOM. Overall, the combinations PCA+KNN, SOM+RF, and SOM+KNN produce preferred results.

• 대한안전경영과학회지
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• 제16권2호
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• pp.185-192
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• 2014

The production type of foundry industry is a small quantity batch production methods that require the highly skilled technology in the global competition in the variety of customer needs and directly under the influence of fluctuations characteristic. Therefore suitability for small quantity batch production and flexible production capacity and price competitiveness is needed more than anything. To do this, we need transcription and comprehensive innovation activities to maximize the revenue structure of the organization and field survival foundation should be developed the TPI(Total Profit Innovation) process in all aspects of the organization and all employees are involved in order to create a cost, quality, time, and service part of the overall aim how to achieve those effects within a short period of time. We applied the TPI process for S company in the foundry business innovation and productivity through cost reduction. We will expect the productivity improvement and financial performance improvement and then continually accumulate and review the results.

• 한국건설순환자원학회논문집
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• 제3권3호
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• pp.268-276
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• 2015

본 논문에서는 탄소저감을 위한 산업부산물 사용 증대 및 시공성능 향상을 위하여 시멘트 사용량을 80% 이상 감소시킨 탄소저감형 4성분계 고유동 콘크리트를 제조하여 품질특성, 및 탄소저감 성능을 수행하였다. 탄소저감형 4성분계 고유동 콘크리트의 품질특성 평가를 수행한 결과 다량의 산업부산물을 혼합하여 시멘트 사용량을 80% 이상 감소시킨 배합에서 목표 성능을 만족하는 품질을 얻을 수 있었으며, 유동특성, 역학특성 및 내구특성의 경우 기존 기준 배합과 비교하여 다소 성능이 감소되는 경향이 나타났지만 소요 성능 수준 이상의 성능을 만족할 수 있는 것으로 판단된다. 또한, 탄소저감형 다성분계 고유동 콘크리트의 탄소저감 성능을 분석하기 위하여 콘크리트의 전 과정 평가를(LCA) 실시한 결과 기존 기준 배합과 비교하여 약 62.2%의 탄소저감 성능이 있는 것으로 나타났으며, 제조비용의 경우 약 24.5%의 원가 절감이 되는 것으로 나타났다.

• 한국수자원학회논문집
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• 제45권8호
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• pp.767-782
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• 2012

일반적으로 관거 및 맨홀 등의 도시 배수 시스템에서의 유사 및 유송잡물의 퇴적은 유수 흐름의 저항, 합류식 하수도의 조기 운영 및 도시 침수 및 주수로에서의 필연적인 오염 발생 등의 하수도 시설에 심각한 영향을 미친다. 그러므로 배수관과 연결된 합류맨홀에서 유사의 거동 특성 및 퇴적 양상을 분석할 필요가 있다. 본 연구에서는 문헌조사 및 현장조사를 실시하여 실험장치를 제작하고 실험조건을 선정하였다. 선정된 실험조건인 맨홀 형상 조건(사각형, 원형), 유사 유입 조건, 유입 유사량 및 유사 유입 관거를 변화시키면서 실시하였다. 맨홀 내부에 경사형 benching을 설치한 개선형 합류맨홀은 맨홀의 형상에 관계없이 합류맨홀 내 유사퇴적을 저감시키는 데에 상당한 효과를 나타내고 있으므로 도시 배수 시스템에서 개선형 합류맨홀은 관거 시설의 배수능력을 증대시킬 것으로 판단된다.

• 자원리싸이클링
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• 제22권6호
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• pp.3-11
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• 2013

본 연구는 사용종료매립지 정비를 위한 폐기물 처리과정에서 가연성폐기물의 처리 방법별 온실가스 발생량을 IPCC에서 제시하고 있는 기본배출계수(default emission factor)를 활용하여 산정하고 그 결과 비교를 통해 온실가스 감축량을 산정하였다. 대상 매립지로부터 굴착한 폐기물의 성상을 조사한 결과 토사류가 64.96%로 가장 많은 비율을 차지하고 있었으며, 다음으로 비닐/플라스틱류가 19.18%의 비율을 차지하고 있어 전체 폐기물 중 토사류의 비율이 매우 높은 것으로 나타났다. 음식물류, 목초류, 종이류와 같이 생분해가 용이한 폐기물이 거의 발견되지 않은 점 등이 일반적인 비위생매립지의 굴착폐기물과 성상이 유사하였다. 전체 폐기물의 겉보기 밀도는 평균 $0.74t/m^3$으로 확인되었다. 폐기물을 매립으로 처리하는 경우 약 60,542 $tCO_2$, 소각을 통해 폐기물 처리 시 9,933 $tCO_2$의 온실가스가 배출되며 폐기물 고형연료 생산 시에는 33,738 $tCO_2$의 온실가스가 감축되는 것으로 산정되어 폐기물 고형연료 생산이 온실가스 감축에 도움이 되는 것으로 확인되었다.

• 한국디지털건축인테리어학회논문집
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• 제12권1호
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• pp.89-98
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• 2012

While the housing transaction price of Seoul tends to be stagnant or declining in line with the housing market recession since 2007, the jeonse price keeps continual increase. Such flow of jeonse price change has a serious influence on ordinary person's housing stability seriously. Therefore, it is very meaningful in terms of social policy to analyze the trend of recent jeonse price change. This study aims to have an empirical analysis of structural characteristics of the trend of recent jeonse price change. After the review of various previous studies, this study selected housing jeonse price index, non-sold house quantity, jeonse vs. transaction price rate, and housing construction performance as analytical variables, and employed monthly time series resources from January 2007 to April 2011. As a result, when the housing supply reduced, the potential quantity for jeonse market reduced that occurred unbalance of supply and demand in jeonse market. In turn, it caused the increase of jeonse price. And, in case of jeonse vs. transaction price rate change, the rate increased which means the increase of required rate of return of invested demand. As such, the increase of market risk degenerates the investment sentiment which caused the reduction of quantity for jeonse market as a submarket.