• 한국태양에너지학회 논문집
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• 제32권6호
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• pp.44-52
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• 2012

In all building's energy simulation applications, solar radiation must be calculated on inclined surfaces. Various solar radiation models based on measured data of specific region were used in building simulation programs. Therefore, we should choose the appropriate solar radiation model for Seoul. The purpose of this study is to compare four solar radiation models on inclined surfaces that are widely used in building energy simulations. In this case, it can be said the appropriate model in Seoul is the Isotropic model.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2004년도 하계학술대회
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• pp.577-586
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• 2004

인터넷을 통해 전달되는 교육자료의 양은 나날이 증가하고 있지만 정보 생산자들이 일정한 표준 없이 자의적인 기준에 의해 정보를 분류하여 구성하기 때문에 이용자가 필요한 정보를 정확하게 찾아내기란 매우 어려운 실정이다. 따라서 털 연구는 국내 주제별 검색엔진인 Yahoo Korea와 Naver, Hanmir, Empas의 초등학생용 검색엔진의 분류체계를 비교 분석하여 주제별 검색을 위한 효율적인 카테고리 분류 방법을 제시함으로써 정보접근에 익숙하지 않은 초등학생에게 쉽게, 빠르게, 정확하게 교육자료에 접근할 수 있는 분류체계를 제시하고자 한다.

• 대한화학회지
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• 제55권5호
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• pp.819-823
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• 2011

The relationship between the microstructure, mechanical properties, and oxidation behavior of pitch-, polyacrylonitrile (PAN)-, and Rayon-based carbon fibers (CFs) has been studied in detail. Three types of carbon fiber were exposed to isothermal oxidation in air and the weight change was measured by thermogravimetric analyzer (TGA) apparatus. After activation energy was gained according to the conversion at reacting temperature, the value of specific surface area and the surface morphology was compared, and the reaction mechanism of oxidation affecting development of pores of carbon fibers was examined. This study will lead to a new insight into the relationship between the microstructure and mechanical properties of carbon fibers.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 학술대회지
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• pp.549-551
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• 2004

This paper used OPNET to simulate video streaming service a test IP network and MPLS network with the traffic shaping that have with CQ_ LLQ algorithm, LSP of fixed bandwidth, policy of limitation users and measures parameters such as delay, throughput, packet loss. To verify the performance of video streaming service in IP network and MPLS network, two scenario that have same topology and traffic source. One is the simulation for best-effort service in pure IP network. The other is the simulation for QoS-enabled service in MPLS Network. Based on simulation result, the MPLS network with CQ_ LLQ algorithm and fixed LSP show advantage of the video streaming service QoS, specially delay and packet loss

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1205-1208
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• 2005

By adding user interface to the usual router, an improved functional router is implemented in this paper. Due to the massive amount of spatial data processing, spatial information processing area has been rapidly grown up in recent years based on powerful computer hardware and software development. Spatial index structures are the core engine of geographic information system(GIS). Analyzing and processing of spatial information using GIS has a lot of applications and the number application will be increased in the future. However, study on the under ground is in its infancy due to invisible characteristic of this information. This paper proposes the sub-surface fault detection system using the sub-surface layer information gathered from elastic wave. Detection of sub-surface fault provides very important information to the safety of above and sub-surface man made structures. Development of sub-surface fault detection system will serve as a pre-processing system assisting the interpretation of the geologist.

• 한국음향학회지
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• 제10권2호
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• pp.5-12
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• 1991

본 논문에서는 한국어 연결 숫자음 인식을 하였다. 처리 시간을 줄이기 위하여 벡터양자화와 1-段 DP 법을 결합하는 방법을 도입하였으며, 표준패턴의 수를 줄이기 위한 새로운 group-labelling 기법을 제안하였다. 여기서 group-labelling은 벡터양자화에 의해 연결 숫자음을 각각 group으로 분류하여 labelling에 줌으로서 인식 대상이 되는 표준패턴의 수를 줄여주는 방법이다. 이 방법을 평가하기 위하여 3 연결 숫자음을 대상으로 실험한 결과, labelling된 group의 선택 수가 적을수록 표준패턴의 수가 감소하므로써 계산량을 감소시킬 수 있었다.

• 대한기계학회논문집B
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• 제23권3호
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• pp.330-341
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• 1999

An experimental study for the two types of burners used in the non-oxidizing direct fired furnaces of the heat treatment process for the cold rolled plate has been carried out to investigate the combustion characteristics and the oxidization of the surface of steel plate. A steep temperature gradient and entrainment of residual oxygen were found near the heating surface in the flame of the nozzle mixing burner which has strong swirl velocity component. It was concluded that the elimination of the residual oxygen and the increase of the temperature of combustion gas on the heating surface are needed to enhance the performance of the burners for application to the non-oxidizing direct fired furnaces.

• KIEAE Journal
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• 제11권4호
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• pp.71-78
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• 2011

The goal of this study is to analyze the impact of load factors on building energy consumption by using EnergyPlus program. We selected a campus building and monitored energy consumption from January 2009 to November 2010. First, we simulated energy consumption basically with weather data, building heat gain and EHP performance data. And then we simulated energy consumption with three additional parameter(infiltration, OA control and schedule). Simulation results are verified by MBE and Cv(RMSE) proposed by M&V guideline 3.0. Simulated total energy consumption was 104.3% of measurements, 4.33% of MBE, and 13.62% of Cv(RMSE). Results show infiltration and schedule were revealed as the most dominant factor of heating energy consumption and of cooling energy consumption, respectively.

• 한국정보교육학회:학술대회논문집
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• 한국정보교육학회 2010년도 동계학술대회
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• pp.313-318
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• 2010

한 국가의 미래는 인적 자원의 개발에 달려 있으며 정보영재는 중요한 인적자원이다. 영재교육진흥법 시행에 따라 영재 교육 체제의 정립을 위한 노력이 계속되고 있음에도 불구하고 영역별 특성에 맞는 정확한 판별 기준이 정립되어 있지 않다는 한계점이 제기되고 있다. 따라서 본 고에서는 이 한계를 극복하고자 초등정보영재 교육 대상자 선발을 위한 추천서를 31개 항목으로 나누어 분석하여 과학영재원 합격과의 상관관계를 통해 관찰 추천의 타당도에 대한 지표를 제공하고자 한다.

• Journal of Magnetics
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• 제15권2호
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• pp.70-73
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• 2010

A magnetic phase is partly produced in a steam generator tube due to stress and heat, because steam generator tubes are exposed to high temperature, high pressure and radioactivity conditions. This adversely affects the safety of steam generator tubes. However, it is difficult to detect it using conventional eddy current methods. Therefore, a new type of probe is needed to separate the signals from the defects and magnetic phases. In this study, a new U-type yoke, which contained two types of coils, a magnetizing coil and detecting coil, was designed. In addition, the signal induced by the magnetic phase and defect in an Inconel 600 plate were simulated.