• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.393-396
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• 2007

Recently one level higher intelligent switching board than established one by the application of intelligent building and digital system are being constructed. Therefore facility's high efficiency, high degree satisfaction, miniaturaization, standardization through application of communication technology and monitoring and controlling by computer system utilized by web-basis power control system and electric IT are practiced. Especially network must be constructed through unified IBS server that monitors every educational institute's switching boards in real time control system. And I intend to create methods to save energy and raise electricity quality by power demand prediction and remote-controled management and operation. In this thesis I intend to suggest measures of forming unified system through researching educational institute's ways of constructing switching board and status analysis and overcoming technical difficulties in user's side and saving and maintenance expense.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.07a
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• pp.261-263
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• 2013

본 논문에서는 회로 구현 디바이스에 따른 저전력 알고리즘을 제안한다. 제안한 알고리즘은 회로를 구현할 디바이스의 면적과 동작 주파수를 고려하여 저전력의 회로를 구현할 수 있는 방법이다. 저전력의 회로를 구현하기 위해 우선 구현하고자 하는 회로를 구성하고 있는 라이브러리들 중에서 최소의 면적을 가지고 있는 라이브러리들을 선택한다. 선택된 라이브러리들의 면적과 지연시간을 이용하여 회로 구현 대상 소자의 면적에 따라 필수 라이브러리들의 면적을 제외한 나머지 면적에 대해 복제가 가능한 라이브러리들의 수를 구한다. 최대의 지연시간을 가지고 있는 라이브러리부터 면적에 따라 차례로 복제를 수행하여 회로 전체의 수행시간을 감소시킨다. 회로 구현의 라이브러리들과 수가 결정되면 회로 동작이 허용하는 범위내에서 주파수를 조절하여 최소의 소모 전력을 갖는 회로를 구현한다. 본 논문에서는 제안한 알고리즘의 효율성을 입증하기 위해 RT 라이브러리를 이용하여 회로를 구현하여 비교 실험을 수행하였다. 실험결과 8.3%의 소모 전력이 감소된 결과를 나타내어 제안한 알고리즘의 우수성이 입증되었다.

• 제어로봇시스템학회:학술대회논문집
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• 1991.10a
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• pp.18-23
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• 1991

We need general developing environment to control robot with effect but less energy. So, software and hardware tools are very important. In this paper, we present a general-purpose robot control language and its implementation on Real Time O/S and VME bus system. The system runs on the VMEexec Real Time Operating System and robot program is written in the "C" language. The developed program is linked with the robot control C library io produce an executable image. Under the developed robot control environment, the user can write a general high-level control program leaving all the specific information about the robot in a robot specific file.ific file.

• Proceedings of the Korean Nuclear Society Conference
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• 1995.05a
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• pp.847-852
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• 1995

A shielding analysis for KSC-7, the shipping cask for transporting the 7 PWR spent fuel assemblies, has been carried out. Radiation source term has been calculated on spent fuel with burnup of 50,000 MWD/MTU and 1.5 years cooling time by ORIGEN2 code. The shielding calculation for the cask has been made by using MCNP4A code with continuous cross section data library from ENDF/B-V. As a result of neutron dose rate analysis, another shielding calculational model on spent fuel shipping cask was provided which is using the Monte Carlo method.

• KIEAE Journal
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• v.10 no.5
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• pp.57-62
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• 2010

Studies on daylighting of buildings have been continuously increased due to the recent escalating oil price and low-carbon strategies in developed countries. Daylighting of buildings not only saves electric energy, but provide the occupants with a comfort visual environment. Atrium spaces are adopted by many modern buildings to improve daylight performance of deep interior spaces. Among the various types of atria, the four-sided type atrium is frequently adopted by library buildings, governmental buildings and office buildings. This study aims to suggest daylighting design data for adjacent occupied spaces by conducting dynamic simulations using Daysim program. Daylight Factor(DF), Daylight Autonomy(DA) and Useful Daylight Illuminance(UDI) levels for 12 measurement points in adjacent occupied spaces were calculated for square-shape four-sided atria with different SAR(Section Aspect Ratio) and different canopy transmittance.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.3
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• pp.197-202
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• 1999

Electric arc furnaces (EAFs) use bulk electrical energy to create heat in metal refining industries. The electric arc process is a main cause of the degradation of the electric power quality such as voltage flicker due to the interaction of the high demand currents of the load with the supply system impedance. The stochastic models have described the aperiodic physical phenomena of EAFs. An alternative approach is to include deterministic chaos in the characterization of the arc currents. In this parer, a chaotic approach to such modeling is described and justified. At the same time, a DLL(Dynamic Link Library) module, which is a FORTRAN interface with TACS (Transient Analysis of Control Systems), is developed to implement the chaotic load model in the Electromagnetic Transients Program (EMTP). The details of the module and the results of tests performed on the module to verify the model and to illustrate its capabilities are presented in this paper.

• Journal of Information Management
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• v.27 no.3
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• pp.1-24
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• 1996

The purpose of this study is to provide by locating various information sources in illuminating engineering and its related field. The proportion that illumination forms in the total electric power consumption takes up to 18%. For the development of new energy-saving lighting products, it Is indispensable to find out and use related technical information. The result of systematic survey of various information sources will be helpful for the researchers and librarians engaged in the field of illuminating engineering.

• Annual Conference of KIPS
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• 2008.11a
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• pp.469-472
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• 2008

임베디드 시스템에서는 기능적 요구사항 뿐만 아니라 전력량, 응답시간, 견고성 등의 여러 가지 비기능적 요구사항들도 중요하다. 그중에서 전력량에 대한 비기능적 요구사항은 휴대형 임베디드 시스템의 운영에 있어서 핵심적인 요소이다. 임베디드 소프트웨어의 복잡도 및 크기 증가로 전력 소모량이 증가하고 있는 추세이며, 그로인해 소프트웨어 기반의 저전력 소모를 위한 임베디드 시스템 개발 기술이 활발히 연구되고 있다. 본 논문에서는 임베디드 소프트웨어 개발의 선행단계에 설계모델 기반으로 소프트웨어 전력소모량을 예측하기 위하여 요구되는 에너지 라이브러리를 구축한다.

• Tunnel and Underground Space
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• v.23 no.4
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• pp.261-270
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• 2013

As part of the development of the 3-D geologic modeling software, this study addresses on new development of software modules that can perform the analysis and visualization of the fracture network system in 3-D. The developed software modules, such as BOUNDARY, DISK3D, FNTWK3D, CSECT and BDM, are coded on Microsoft Visual Studio platform using the MFC and OpenGL library supported by C++ program language. Each module plays a role in construction of analysis domain, visualization of fracture geometry in 3-D, calculation of equivalent pipes, production of cross-section map and management of borehole data, respectively. The developed software modules for analysis and visualization of the 3-D fracture network system can be used to tackle the geomechanical problems related to strength, deformability and hydraulic behaviors of the fractured rock masses. All these benefits will further enhance the economic competitiveness of the domestic software industry.

• Nuclear Engineering and Technology
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• v.53 no.2
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• pp.423-429
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• 2021

The investigation of the utilization of enriched ²⁰⁸Pb as a coolant to enhance the performance of a long-life fast reactor with a Modified CANDLE (Constant Axial shape of Neutron flux, nuclide densities, and power shape During Life of Energy production) burnup scheme has performed. The analyzes were performed on a reactor with thermal power of 800 MegaWatt Thermal (MWTh) with a refueling process every 15 years. Uranium Nitride (enriched ¹⁵N), ²⁰⁸Pb, and High-Cr martensitic steel HT-9 were employed as fuel, coolant, and cladding materials, respectively. One of the Pb-nat isotopes, ²⁰⁸Pb, has the smallest neutron capture cross-section (0.23 mb) among other liquid metal coolants. Furthermore, the neutron-producing cross-section (n, 2n) of ²⁰⁸Pb is larger than sodium (Na). On the other hand, the inelastic scattering energy threshold of ²⁰⁸Pb is the highest among Na, ^natPb, and Bi. The small inelastic scattering cross-section of ²⁰⁸Pb can harden the neutron energy spectrum. Therefore, ²⁰⁸Pb is a better neutron multiplier than any other liquid metal coolant. The excess neutrons cause more production than consumption of ²³⁹Pu. Hence, it can reduce the initial fuel loading of the reactor. The selective photoreaction process was developing to obtain enriched ²⁰⁸Pb. The neutronic was calculated using SRAC and JENDL 4.0 as a nuclear data library. We obtained that the modified CANDLE reactor with enriched ²⁰⁸Pb as coolant and reflector has the highest k-eff among all reactors. Meanwhile, the ^natPb cooled reactor has the lowest k-eff. Thus, the utilization of the enriched ²⁰⁸Pb as the coolant can reduce reactor initial fuel loading. Moreover, the enriched ²⁰⁸Pb-cooled reactor has the smallest power peaking factor among all reactors. Therefore, the enriched ²⁰⁸Pb can enhance the performance of a long-life Modified CANDLE fast reactor.