• Proceedings of the Korean Institute of Building Construction Conference
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• 2010.05a
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• pp.13-16
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• 2010

This study is an Investigation on the Watertightness Properties of Rain-Block System on the Sliding-Roof Joint of Large-Span Membrane Structures. In this experimental, we test the watertightness performance of joint part of sliding door in roof of large span membrane structure(for pilot project) under environment of rain and wind. A shape of rain water blocking systems of joint part in sliding door verifies the defects and effects of water leakage prevention in precipitation with the wind conditions. For obtaining watertightness of large span membrane structures, it is necessary quality of joints and performance, and quality of membrane material of a retractable roof as well as a closed roof. Also, for obtaining quality in joints, it is essential to make a watertightness guideline for design of large-span membrane.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1364-1365
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• 2008

가스 절연 개폐장치(Gas Insulated Switchgear)의 고체 스페이서에 다양한 유전율 분포를 가진 경사기능성 재료(Functionally Graded Material)를 적용할 때, 전계의 완화를 예상할 수 있다. FGM 스페이서는 전계의 집중을 완화시킬 수 있고, 내부의 전계를 더 균일하게 분포시킬 수 있다. 본 연구에서는 유한요소법을 이용하여 상용 GIS의 FGM 스페이서에서 전계의 세기를 계산하였다. 계산 결과를 통해 스페이서의 유전율이 빠르게 변화하는 경우, 더 효율적으로 최대전계를 감소시켰고, 스페이서 내부의 전계를 균일하게 하였다. 결과적으로 FGM 스페이서는 단일 유전율을 가진 스페이서에 비해 절연 성능을 향상시킬 수 있다.

• 전기의세계
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• v.28 no.4
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• pp.3-9
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• 1979

대기오염은 인간의 건강에 중요한 영향을 미칠뿐 아니라 공업적으로도 많은 해를 초래하고 있다. 그중 한가지 예가 접촉부품에 대한 것을 열거할 수 있다. 일반적으로 모든 금속재 부품에 대해서도 같은 영향을 주나 접촉부품에서는 접촉저항 특성을 중요시하기 때문에 대기오염의 영향은 직접적으로 민감하게 미친다고 볼 수 있다. 접촉부품은 전기회로를 개폐, 절환 또는 이탈시키는 작용을 하며, 크게 나누어 개폐, 정지및 접동등 세가지 형식으로 분류할 수 있다. 이러한 견지에서 대부분의 전자장치및 전기기기에는 접촉부품이 어떠한 형태로서든지 사용하게 되며, 또한 중요한 기능과 역할을 담당하고 있음을 알 수 있다. 이러한 접촉부품에서 접점의 성능은 일반적으로 접촉저항특성, 융착특성 및 소모전이 특성 등 여러 특성으로 요약할 수 있으며 특히 소형화의 경향이 있는 접촉부에 대해서는 접촉저항특성이 중요한 요소가 된다. 일반용의 금속과 같은 과정으로 접촉부금속도 주위 분위기의 기체와 반응을 하여 접촉면에 여러 오염피막을 발생시킨다. 이러한 오염피막은 일반적으로 높은 전기저항을 표시하기 때문에 접촉저항특성을 현저하게 나쁘게 할 것이다. 이러한 입장에서 정밀하고 신뢰성 있어야 할 접촉부품이 대기오염으로 인하여 전기적성질이 저하되어 예기치 못하였든 사고발생을 추정해야 할 시기가 우리나라에도 도래한 것 같으며 공업단지내의 공장에 종사하는 기술자는 적어도 이러한 문제를 고려해야 하겠기애 몇가지 사항에 대하여 간단히 기술하고자 한다.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
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• v.16 no.4
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• pp.16-23
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• 2020

In this study, the control characteristics and effects of control methods on heating performance and energy consumption for the hot water floor radiant heating control system of a residential apartment were research by experiment. As a control method, On-Off control and outdoor reset control methods with GRNN(General Regression Neural Network) and without GRNN are considered. Also, the control performances with regard to improvement of indoor thermal environment and reduction of energy consumption are compared, respectively. Experiment results show that the performance of the control method with GRNN is better than that of conventional on-off control method without GRNN in the responses of room set temperature and energy saving.

• Journal of Bio-Environment Control
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• v.6 no.4
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• pp.242-249
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• 1997

Environmental control operations have been considerably contributed to the reduction of labor cost in both plastic film and glass greenhouses since government supported projects were begun. However, some problems are still remaining on the optimal environmental control and excessive operation due to an inflexible software regulating ventilation gear - reducers. The unadjustable software caused the damage of ventilation system, resulting in heat stresses of crops. This study was performed to develop a ventilation software controlling the vent opening level, opening sequence, based on the wind direction, and control interval according to the difference between ambient and set- up temperatures. The software included a beeper system alarming urgent cases, while a manager was remote from the greenhouse. A compatible hardware with the software was also developed by using a low-cost diffused DSP controller.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.2
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• pp.20-27
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• 2007

[ $SF_6$ ] gas for compacted power facilities has a important role as an insulation gas. It is very blown well that $SF_6$ gas has the superior characteristics as an insulation gas. For reliable operation of SF6-gas-based high and medium voltage equipment it is very important to keep the insulation ability within a safe range. And the experimental and measuring system were implemented. The test chamber designed to endure up to 3 atmospheric pressure. The analysis results of the experimental data shows that positive partial discharge can be detected by discharge current and UHF signal. Additionally it is shown the possibility that $CO_2$ gas sensor of semiconductor type can be detect the variation of $SF_6$ gas condition. The UHF sensor shows good feature to detect the variation of $SF_6$ gas condition for partial discharge and breakdown discharge.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.7
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• pp.67-77
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• 2016

In this paper, we propose an algorithm for open/closed eye detection based on modified Hausdorff distance. The proposed algorithm consists of two parts, face detection and open/closed eye detection parts. To detect faces in an image, MCT (Modified Census Transform) is employed based on characteristics of the local structure which uses relative pixel values in the area with fixed size. Then, the coordinates of eyes are found and open/closed eyes are detected using MHD (Modified Hausdorff Distance) in the detected face region. Firstly, face detection process creates an MCT image in terms of various face images and extract criteria features by PCA(Principle Component Analysis) on offline. After extraction of criteria features, it detects a face region via the process which compares features newly extracted from the input face image and criteria features by using Euclidean distance. Afterward, the process finds out the coordinates of eyes and detects open/closed eye using template matching based on MHD in each eye region. In performance evaluation, the proposed algorithm achieved 94.04% accuracy in average for open/closed eye detection in terms of test video sequences of gray scale with 30FPS/$320{\times}180$ resolution.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.299-300
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• 2019

본 논문에서는 MVDC(Medium-Voltage DC) 차단기의 성능평가를 수행하기 위해 사용되는 단락 시험 설비의 새로운 구조를 제시한다. 단락 시험 설비는 직류 고전압과 고전류를 발생시키고 이러한 조건에서 차단기의 개폐 성능을 검증한다. 고전압과 고전류를 단일 회로로 합성하는 구조의 경우, 단락 시험 설비의 규모와 전력용량이 매우 크다. 제시하는 단락 시험 설비는 별개의 회로인 고전류원과 고전압원으로 구성된다. 각 회로에서 직류 고전압과 고전류를 발생시켜 단락 시험을 수행하는 구조이다. 제시하는 단락 시험 설비의 구조와 동작 원리를 설명하고 시뮬레이션 분석을 통하여 그 성능을 검증하였다.

• Land and Housing Review
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• v.5 no.4
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• pp.325-332
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• 2014

The purpose of this study was to measure the airtightness and Air-Flow Performance for 7th house of small apartment houses adopted window frame-type natural ventilation. All window and living room door is provide with window frame-type natural ventilation, and there is provide with manual controller. As the object of measurement, the 6th type small apartment houses with area of $33m^2$ to $51m^2$ was selected. airtightness performance was measured at the front door using Blower door system. We measured ventilation rate per hour on 50Pa pressure different between inside and outside by the 1st to 6th cases. As a result, when the natural ventilation frame was closed, average amounts are shown as the ventilation rate per hour were 2.27ACH (CASE1). and the result is similar to general apartment house (1.65~4.28ACH). When the natural ventilation frame was open, average amounts are shown as the ventilation rate per hour were 5.87ACH (CASE6). In addition, that's a 3.6ACH increased more than CASE1.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.5
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• pp.2031-2037
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• 2011

The French doors have the advantage that they can use inner space more efficiently due to without of partition between two rooms. However, when they are used for refrigerators, the door gaskets for sealing may cause interference of themselves during opening and closing, which causes fatal effect on sealing by worn out of the gaskets as well as increases door opening force. This research proposes a new mechanism for the French doors using the parallelogram motion of 4-bar linkage mechanism, which does not make any interference between gaskets. We manufactured the French doors of proposed mechanism to verify that they do not cause any interference during opening and closing, as well as opening force is decreased. The use of our developed mechanism is not limited to refrigerators, but can be extended to other industrial products with the French doors.