• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.11a
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• pp.249-254
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• 2008

The objective of this study is to interpret a environmental-friendly plan factors of Korean traditional settlement used of existing classification system. The existing classification system framework is six environmental ecological ideas as the adaptation to the adaptation to the availability of land, the eco-space in village, the system of house, the cycling of material and the reasonable energy system, the water resources, prevention of environment pollution. Additional research was undertaken to verify the findings. Through the interpretation, it has been found out that Gu-Rim tradition village has been developed to an environmental ecological rational setting and has the meaningful elements for environmental friendly housing estates.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.55 no.5
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• pp.265-270
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• 2006

In this paper EMI problems with induction motor drive system using multi-level inverters are investigated. The high power multi-level inverter usually operates with low switching frequency and produces large noises. Generally, EMI consists of the conduction component through source lines and emission component emitted to the space. This conduction component can be classified to the common-mode between source line and ground, and the normal-mode between lines. The EMI filters for the induction motor drive system are designed and implemented to reduce EMI noise. Finally the designed system is verified by the experiment. The experimental results show that both the normal mode and common mode noises are greatly reduced compared to the system without filters.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.561-562
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• 2008

In this paper, we propose a establishment of system level environment to exploit PC system with SSD (Solid State Disk) by using TLM (Transaction Level Modeling) method with SystemC language. The reason why we choose this modeling method is that it eases RTL (Register Transfer Level) modeling burdens and we can accurately estimate the performance about different architectural changes. Also, it provides simulation speed which is relatively faster than RTL modeling method. The baseline architectural platform we implemented showed that SSD's internal transfer time is a dominant factor, so we need to improve that part and it is expected to be a good simulator to measure the system's overall performance by exploiting SSD's internal architectures.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.111.5-111
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• 2001

This paper places great importance on performance improvement of Galvanometer system used for laser display, laser processing, marking system. Fundamentally, we implement control system, on that assumption that laser source exists, and design basic PID controller. Hardware is composed of DSP(TMS320C32) chip, and the position compensation of Galvanometer is performed by using 16-bit A/D and D/A converter. Through frequency response analysis and simulation, the attribute of plant and controller is captured and then, total system is analyzed. We deliberate noise problem that can be caused from analog signal as driving signal for Galvanometer.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2279-2280
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• 2008

When electric power systems expand and become more interconnected, the fault current levels increase in the distribution system. Therefore, we studied the influence of the power system according to application of a resistive FCL. In this paper, the distribution system and the resistive FCL were modeled by using EMTP (Electromagnetic Transients Program), which simulates the effect of the resistive FCL for the single line ground fault in distribution system.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1533-1534
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• 2015

본 논문에서는 VDTA를 이용하여 플로팅 인덕터를 구현하기 위한 새로운 방법을 제안하였다. 제안된 방법은 [3]에서 사용하고 있는 방법을 개선하여 더 적은 수의 회로를 이용하여 양 기능 인덕터를 구현함으로써 변환방법이 용이하고 회로의 면적과 소비전력을 줄일 수 있는 방법이다. 2장에서는 VDTA에 대한 기본적인 개념과 새로운 양기능 인덕터의 구조제안 및 새롭게 제안한 능동 인덕터를 이용하여 2차 2MHz의 중간주파수를 갖는 대역통과 설계하고 그 유용성을 확인하였다. 2MHz의 중심주파수를 가지는 대역통과 필터와 그 필터의 특성을 시뮬레이션을 통하여 나타내었다. 그리고 3장에서 결론지었다.

• Journal of information and communication convergence engineering
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• v.8 no.6
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• pp.651-654
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• 2010

In this paper, we propose two power randomization schemes for the random beamforming (RBF) based MIMO systems in cellular downlink. In the proposed system, a BS randomizes not only the pre-coding matrix but also the power allocation matrix, while the conventional RBF system allocates an equal power to each transmit stream. The proposed water-filling based power randomization scheme (Scheme-I) is proper in the low SNR values and the proposed random-power based randomization scheme (Scheme-II) is proper in the high SNR values. The proposed system with the power randomization outperforms the conventional RBF system which allocates the same power for each data stream.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.460-465
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• 2003

The modeling of PEM (Proton Exchange Membrane) fuel cell system consisting of fuel cell stack and BOP (Balance of Plant) is presented in this paper. The effects of temperature, pressure (air, hydrogen), and humidity on the fuel cell system performance were mainly investigated using thermo-dynamical and electro-chemical equations. To understand the power distribution characteristics of fuel cell system, the effects of operating temperature and air pressure on maximum power and system power were also demonstrated. Through this study, we can get the basic insight into the fuel cell stack and BOP component sizing and it can be used effectively for the optimization of the practical fuel cell systems in purpose.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.05a
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• pp.151-152
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• 2012

Recently, there are growing interests in building LCCO₂ Assessment to reduce carbon emissions. However, existing methods of assessment system include inefficiency in the process of CO₂ calculation requiring considerable data input. Therefore, the purpose of this study is to develop an efficient building assessment system appropriate to material production in construction stage. To that end, quantity input technology was limited to data mapping. Also quantity calculation based on work breakdown structure and item codes consisted of hierarchical structure that is based on facet classification were analyzed. As a result, connectivity links of quantity calculation and CO₂ functional units through item codes for data mapping, and assessment system including calculation and database parts were developed.

• Journal of Institute of Control, Robotics and Systems
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• v.16 no.1
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• pp.90-95
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• 2010

This paper describes the development of integrated head and eye tracker system. Vision based head tracker is performed and it has 7mm error in 300mm translation. The epi-polar method and point matching are used for determining a position of head and rotational degree. High brightness LEDs are installed on helmet and the installed pattern is very important to match the points of stereo system. Eye tracker also uses LED for constant illumination. A Position of gazed object(3m distance) is determined by pupil tracking and eye tracker has 1~5 pixel error. Integration of result data of each tracking system is important. RS-232C communication is applied to integrated system and triggering signal is used for synchronization.