• Journal of Korean Society for Geospatial Information Science
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• v.16 no.2
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• pp.57-65
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• 2008

The improvement of the performance in laser radar simulation requires fast retrievals of the spatial locations and attributes of objects in response to the laser signals of the simulators. Since the data used in simulation are complex 3D objects such as terrain, buildings and vehicles, and are of large sizes, commonly used 3D modeling tools are not suitable for this use. We proposed a method to store such 3D objects in a database, perform required queries and integrate with visualization tools. We showed the processes for the data modeling based on 3D topological concepts and then building a spatial DBMS. Also, we illustrated the process for accessing and visualizing the stored data using VRML and performed test computations using some laser signal data. With further enhancement on data modeling and LOD problems in visualization, the proposed method will be practically applied in different situations including laser simulation.

• The Journal of the Acoustical Society of Korea
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• v.26 no.7
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• pp.353-360
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• 2007

Rapid urbanization and population increasing are making a high-rise residential building and high-density residential area. According to spacial concentration of population is occurred road traffic noise problem. Now we are popularly using almost only noise barrier installation, but it makes many disfunctions such as poor landscape, low noise barrier performance and crimes. The purpose of this research is to figure out which is best method one the traffic noise management. Alternative are composed to building layout type ($30^{\circ},\;90^{\circ},\;180^{\circ}$), separation between road and residential building, noise barrier types(noise barrier only, noise barrier and forests and etc). The noise barrier are shown to reduce barrier and building layout angle $30^{\circ}$ position is the best comparing with horizontal and vertical layouts. The gab distance is decreased approximately noise level 5dB(A). We figured out there are noise important method except noise barrier wall and it was analyzed how much decreased. This can be very useful before making a road planning and residential building design.

• Journal of Energy Engineering
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• v.24 no.4
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• pp.81-88
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• 2015

In midst of electrical energy consumption on the rise due to the industrial development and the improved quality of living, medium capacity and multi boilers which use gas that is comparatively low cost and can be supplied reliably are simulated for energy consumption using the partial load data obtained from the experiment. Economic analysis that considers initial and operation costs is carried out based on the Annual equal payment method.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.18 no.12
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• pp.947-954
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• 2006

Building energy consumption according to the ventilation has been considered to be an important subject. The purpose of this study is to investigate the cooling and heating loads in a test space with a forced ventilating system. In the test space, on/off controlled air-conditioning and forced ventilating facility were operated between 8 : 30 to 21 : 00 during 4 days and some important data like temperatures and energy consumption were measured to obtain actual thermal loads. The simulation was carried out in a mode of temperature level control using a TRNSYS 15.3 with a precisely measured air change amount and performance data of air-conditioner. Heating load and cooling load including sensible and latent were compared between by experiment and by simulation. Both of thermal loads associated with ventilation show a close agreement within an engineering tolerance.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.26 no.9
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• pp.409-415
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• 2014

Ground-source heat pump (GSHP) systems have become an efficient alternative to conventional cooling and heating methods due to their higher energy efficiency. These systems use the ground as a heat source and the heat sink for cooling mode operation. The purpose of this simulation study is to evaluate the performance of a hypothetical GSHP system in an office building and to assess the energy saving effect against the existing HVAC systems (boiler and turbo chiller). We collected monthly energy consumption data from an actual office building ($32,488m^2$) in Seoul, and created a model to calculate the hourly building loads with EnergyPlus. In addition, we used GLD (Ground Loop Design) V8.0, a GSHP system design and simulation software tool, to evaluate hourly and monthly performance of the GSHP system. The energy consumption for the GSHP system based on the hourly simulation results were estimated to be 582.6 MWh/year for cooling and 593.2 MWh/year for heating, while those for the existing HVAC systems were found to be 674.5 MWh/year and 2,496.4 MWh/year, respectively. The seasonal performance factor (SPF) of the GSHP system was also calculated to be in the range of 3.37~4.28.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.10
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• pp.6759-6765
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• 2015

In this study, the effects of control strategies of night-purge control system on control characteristics and energy consumption for central cooling system in building are researched by simulation. The start time and set-point temperature for night-purge control with outdoor temperature changes and building cold storage performance are obtained. The system analysis modelling is done by using TRNSYS program package, and the control performances with suggested night-purge control method are compared with the existing control ones. As a result, the suggested night-purge control method shows maximum 16.8% and 28.6% energy saving in comparison with existing control method and conventional one without night-purge control, respectively.

• Solar Energy
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• v.18 no.3
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• pp.31-39
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• 1998

Selection of a right weather data set has been considered as one of important factors for a successful building energy audit process. A set of 30 year raw weather data base for six major cities has been developed to provide the weather data file for building energy audit and retrofit analysis in Korea. The program named as KWDP(KIER Weather Data Processor) uses the DB to produce a right data set for a specific building energy performance simulation program like DOE2.1E. A program called WMAKE has been developed to generate the right set of input parameters for DOE2.1E weather utility program. The set of the programs could provide the right weather data for specific building energy audit and retrofit analysis.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.287-288
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• 2011

주택 혹 산업용, 공공건물용으로 상용화 되어 있는 스트링 어레이 중앙 인버터 방식은 고압의 DC 배선으로 인한 안전문제, 고가의 고압 DC 차단기의 설치 및 과전압보호기 등으로 가격이 상승하게 되고 설치 시에도 패널간 균일 성능을 보장해야하고 스트링 상에 놓여 있는 패널 일부가 불량이거나 그림자가 져서 발전이 미비할 경우 전체 시스템 발전이 정지하거나 발전량이 미비해지는 문제가 생기므로 항상 최적의 상태로 운전할 수 없다. 그래서 이러한 태양광 발전 방식의 문제점을 해결하기 위해 각 모듈마다 마이크로 인버터를 장착하여 각각 패널마다 분산적인 MPPT(Maximum Power Point Tracking) 를 수행할 수 있고 DC 배선이 없기 때문에 시스템 설치비용을 획기적으로 절감할 수 있으며 안정성 문제도 중앙 인버터 방식보다 획기적으로 향상된다. 패널 또는 인버터 고장 시 전체 시스템의 차단 없이 교체가 가능 하여 시스템의 설비 이용률을 최대로 할 수 있다. 이러한 패널에 쓰이는 마이크로 인버터를 PSIM으로 구현하여 DLL로 통해 디지털 제어로 구현을 하고 시뮬레이션으로 통해 시스템의 효능을 알아보았다.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.159-162
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• 2009

세계적인 에너지 자원 무기화와 더불어 에너지 효율이 높은 창호개발이 지속적으로 진행되고 있다. 이중 진공패널은 단열성능이 우수하여 건물에서의 에너지 절약 측면에서 미래의 창호소재로 각광 받고 있으나 구조 및 제조공법에 관한 규명이 되어 있지 않다. 진공패널은 대기압 및 외력에 견딜 수 있도록 구조를 형성해야 하며, 이를 위하여 진공간극을 유지하기 위한 지지대를 사용한다. 본 논문에서는 진공패널에서 지지대의 배열에 따른 진공패널의 응력분석과 이 데이터 평가를 통한 허용응력 내에서의 유리지지대 배열방안을 제시하고 시뮬레이션을 통해 그 타당성을 검증하였다.

• 한국태양에너지학회:학술대회논문집
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• 2011.11a
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• pp.196-201
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• 2011

The energy used in Korea is strongly dependent on that produced by foreign countries. Accordingly, saving energy is more important than ever, because of the rise of international oil prices and depletion of oil resources. The development of energy efficient buildings is required especially for public buildings in Korea. In this study, the energy use of public buildings is identify. Then, the analysis of energy usage through regional offices in Busan City offers energy performance for public buildings.