• 제목/요약/키워드: performance improvement

검색결과 12,324건 처리시간 0.044초

단열성능 향상 재료를 사용한 콘크리트의 내구성에 관한 연구 (Durability of Concrete Using Insulation Performance Improvement Materials)

  • 박영신;김정호;김세환;김상헌;전현규
    • 한국구조물진단유지관리공학회 논문집
    • /
    • 제19권3호
    • /
    • pp.22-29
    • /
    • 2015
  • 본 연구에서는 압축강도 24MPa 이상 열전도율이 기존 콘크리트보다 2배 감소된 구조용 단열성능 향상 콘크리트를 개발하고 현장적용하기 위한 실험을 진행하였다. 슬럼프 및 공기량 시험결과 Plain과 규조토 미분말을 사용한 배합은 경과시간에 따라 슬럼프와 공기량 저하가 나타났으며, 마이크로기포제를 사용한 배합은 슬럼프와 공기량 저하가 나타나지 않았다. 또한 단열성능 향상 재료를 사용한 배합의 단위용적질량은 Plain 대비 감소하였다. 압축강도는 단열성능 향상 콘크리트가 Plain보다 감소한 결과를 나타내었으나 목표강도 24MPa를 만족하였으며, 열전도율은 Plain보다 감소하는 경향을 보였다. 단열성능 향상 콘크리트의 동결융해 저항성은 Plain과 유사하였고, 중성화 저항성은 규조토 미분말을 사용한 배합이 재령 4주에 Plain과 유사했으며, 마이크로기포제를 사용한 배합은 Plain보다 중성화 저항성이 저하되었고, 길이변화율은 Plain보다 전체적으로 증가되었다.

노후산업단지 구조고도화사업을 위한 환경개선펀드 성과분석에 관한 연구 (A Study on the Performance Analysis of Environmental Improvement Fund for the Structural Advancement Project of the Old Industrial Complex)

  • 김종하;정재호
    • 토지주택연구
    • /
    • 제11권3호
    • /
    • pp.21-31
    • /
    • 2020
  • This paper quantitatively analyzes the investment performance of the environmental improvement fund focusing on the sales effect and the housing benefit effect. The analysis of this study focused on the effects of sales and housing benefits for completed business sites among the business sites supported by the Environmental Improvement Fund. The analysis results are as follows. First, it appears that the sales effect of the completed workplace is effective compared to the amount of investment, so it seems that the purpose of industrial integration of the environment improvement fund is being achieved. Second, it was found that there are variations by workplace and region in housing benefits. This seems to be due to the fact that profitability can be neglected by reflecting the characteristics of residential facilities built by private businesses. The Environmental Improvement Fund is a policy fund that pursues both profitability and publicity. Therefore, it is necessary to transform the structure of the fund to expand support for industrial infrastructure with high publicity. To this end, it is necessary to establish a long-term management plan that equitably considers the profitability and publicity of the environmental improvement fund.

기존 건축물의 리트로핏에 따른 에너지 성능개선 효과 분석 (Efficiency of Energy Performance Improvement by Retrofit in existing Buildings)

  • 김동희;문현석
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2016년도 추계 학술논문 발표대회
    • /
    • pp.126-127
    • /
    • 2016
  • The Korean government has developed and strengthened energy related regulations to pursue eco-friendly buildings since 1979. However, required design standards for energy based quantitative studies focused on energy performance in existing buildings are meagered. Therefore in this study, required energy performance by design standards for energy are analyzed. And a energy performance by retrofits for insulation improvement is studied using energy simulations.

  • PDF

An Experimental Study on the Improvement of Turbocharger Lag by Means of Air Injection in a Turbocharged Diesel Engine

  • Choi, Nag-Jung;Oh, Seong-Mo
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제34권7호
    • /
    • pp.951-962
    • /
    • 2010
  • An experimental study was performed to investigate the improvement of response performance of a turbocharged diesel engine under the operating conditions of low speed and fast acceleration. In this study, the experiment for improving the low speed and acceleration performance is performed by means of injecting air into the intake manifold of compressor exit during the period of low speed and application of a fast acceleration from low speed. The effects of air injection into the intake manifold on the response performance were investigated at various applicant parameters such as air injection pressure, accelerating rate, accelerating time, engine speed and load. The experimental results show that air injection into the intake manifold at compressor exit is closely related to the improvement of turbocharger lag under low speed and accelerating conditions of a turbocharged diesel engine. During the rapid acceleration period, the air injection into the intake manifold of turbocharged diesel engine indicates the improvement of the combustion characteristics and gas pressure in the cylinder. At low speed range of the engine, the effect of air injection shows the improvement of the pressure distribution of turbocharger and combustion pressure during the period of gas exchange pressure.

프랜차이즈 요식업 종사자의 인적자원관리가 경영성과에 미치는 영향 (A Study on the Influence of Human Resource Management of Franchise Restaurant Employees on Business Performance)

  • 윤강석;임상호
    • 산업진흥연구
    • /
    • 제2권2호
    • /
    • pp.7-13
    • /
    • 2017
  • 본 연구는 프랜차이즈 요식업 종사자의 인적자원관리가 경영성과에 미치는 영향을 분석하였다. 첫째, 프랜차이즈 종사자의 채용관리가 경영성과에 통계적으로 유의한 영향을 미치지 않았다. 둘째, 평가관리(p<.05, ${\beta}=1.887$)가 업무향상에는 유의한 영향을 미친 것으로 나타났으나, 재무성과에는 유의한 영향을 미치지 않았다. 셋째, 경력관리(p<.05, ${\beta}=1.715$)는 재무성과에 영향을 미친 것으로 나타났으나, 업무향상에는 유의한 영향을 미치지 못한 것으로 분석되었다. 넷째, 업무향상과 채용관리(.441), 업무향상과 평가관리(.476)는 p<.01 유의 수준으로 다소 높은 상관관계가 있는 것으로 나타났고, 재무성과와 채용관리(.375), 재무성과와 평가관리(.356), 재무성과와 경력관리(.371)는 p<.05 유의 수준의 상관관계가 있는 것으로 분석되었다. 본 연구는 프랜차이즈 요식업 종사자의 인적자원관리가 경영성과에 미치는 영향을 분석함으로써 채용관리, 경력관리, 평가관리가 업무향상, 재무성과에 대한 특성 요인의 중요도를 파악하고 특성요인의 효과성을 검증하는데 연구의 의의가 있다.

멀티미디어 객체 처리 성능 향상을 위한 웹 캐싱 기법의 설계 (A Design of Web Caching for Improvement of Processing Performance on a Multimedia Object)

  • 나윤지;최승권;신승수;조용환
    • 한국콘텐츠학회:학술대회논문집
    • /
    • 한국콘텐츠학회 2004년도 춘계 종합학술대회 논문집
    • /
    • pp.434-438
    • /
    • 2004
  • 본 연구에서는 멀티미디어 객체 처리의 성능 향상을 위한 웹 캐싱 기법을 제안한다. 제안 기법은 멀티미디어 객체의 이질성을 기반으로 하고 있으며, 멀티미디어 객체의 캐싱 효율을 높여 캐싱 시스템의 성능을 높이고자 하는 것이다. 또한 실험에서 제안 시스템의 성능 분석을 통해 시스템의 성능 향상을 검증하였다.

  • PDF

조직성과에 미치는 SPI 영향요인에 관한 연구 :조직 성숙도의 조절효과 관점에서 (The SPI Factors Affecting on Organizational Performance: The Prespective of the Moderating Effect of Organizational Maturity Level)

  • 김인재;설경환
    • 한국정보시스템학회지:정보시스템연구
    • /
    • 제19권2호
    • /
    • pp.97-118
    • /
    • 2010
  • Software Process Improvement(SPI) has been a challenging issue to software organizations. The factors affecting SPI were analysed for improving software development processes. Numerous studies suggested influencing factors, and assessment models were utilized for software improvement. This research suggested that SPI factors affecting on an organizational performance may vary according to the CMM(Capability Maturity Model) level. The moderating effects of organizational maturity level between the SPI factors and the organizational performance were empirically tested. This research found that all six SPI factors except for the resistance to change affected the organizational performance. The moderating effects of management support, goal alliances, participation, and effect analyses were empirically supported. These results can provide several implications or a practical guidance to academic and industry professionals.

Output Improvement of a Magnetic Levitation Control System

  • Jung, Hae-Young;Na, Seung -You
    • 한국지능시스템학회:학술대회논문집
    • /
    • 한국퍼지및지능시스템학회 1995년도 추계학술대회 학술발표 논문집
    • /
    • pp.59-70
    • /
    • 1995
  • Output performance improvement using fuzzy logic to the conventional control scheme for a magnetic levitation system is presented in this paper, Adverse characteristics of nonlinearity, unstability, system parameter variation, etc, in the levitation system are partially overcome by the general fuzzy control action. Using a PD type compensator, a coarse framework of output performance is provided to the levitation system. Then a fine regulation to the output performance requirement is obtained by the natural description of the control action in the form of fuzzy logic controller. This control action soothes the adverse characteristics of the levitation system. In this way a better output performance can be obtained in a real time experiment.

  • PDF

디칸터의 고장분석 및 성능 향상에 관한 연구 (A Study on the Failure Analysis and Performance Improvement of a Decanter)

  • 신창호;이동철;김우형;최태주;정진태
    • 대한기계학회논문집A
    • /
    • 제28권5호
    • /
    • pp.586-592
    • /
    • 2004
  • In this study, the failure analysis of a decanter is carried out and the methods of performance improvement are presented. The decanter is a centrifugal separator that is used to separate water and solids from municipal and industrial sludge. Therefore, the decanter should be designed to improve the dewatering of sludge. Besides high performance, the decanter should guarantee its life time under a severe using condition. For theses reasons, the failure analysis and performance improvement of the decanter are studied. It is found from this study that the failure is caused by mass unbalance, wear, clogging or crack. If these failure causes are prevented, the life time as well as the performance is expected to be improved.

페이딩 채널에서 최대비 합성 다이버시티 기법과 길쌈 부호화 기법을 채용한 16 QAM 신호의 수신 성능 개선에 관한 연구 (A Study on Performance Improvement of Convolution coded 16 QAM Signal Reception with Maximum ratio combining Diversity in Fading Channel)

  • 이호영;김언곤
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2008년도 추계학술대회 논문집
    • /
    • pp.1312-1320
    • /
    • 2008
  • In this paper, we analyzed the error rate performance of convolution coded 16 QAM signal with Optimum Threshold Detection with maximum ratio combining diversity in Rician Fading Environments. The performance of 16-QAM signal with CTD (conventional threshold detection) which employs convolution coding technique was analyzed and the performance improvement of convolution coded 16-QAM signal with OTD (optimum threshold detection) which is varied according to fading parameter "K" and AWGN in Rician Fading channel was simulated. As a result of analysis, it was shown the effect of performance improvement to overcome the environment of mobile radio data communication channel.

  • PDF