• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기물성,응용부문
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• pp.194-196
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• 2002

This paper deals with a proper installation methods of SPDs for information-oriented and computerized equipments. Since the information and computerized equipments have AC power lines and communication lines, the potential difference by lightning surge occurs between grounding points of the AC power lines and subscriber protectors, and it causes the flashover and damage. So, we have investigated the effect of the installation methods of surge protectors on the control of overvoltages, using a real-sized test circuit with a customer's facility. As a consequence, it was confirmed that the protection methods by installation of SPDs on the neighbor branch circuit was effective.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2001년도 학술대회논문집
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• pp.173-180
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• 2001

Electric power facilities must have effective grounding to provide means to carry electric current into the earth under fault conditions and to prevent damage of equipment, Ignition, and electrocution of presonnel. nuts paper present an algorithm called the Pattern Search method for the optimal parameters selection of the grounding system. Computer simulation results used the CDEGS grounding analysis program verifying the effects of the grounding system design parameters obtained from this method show that the grounding systems are adequately designed.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
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• pp.149-154
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• 2004

In this paper, we observed an electrode structure that is an important element that decide life of compact fluorescent lamp. We measured winding and application type of electron emission material and electrode damage with SEM(Scanning Electron Microscope). From now on, we need to measure rather several difference aging-time sample than analyze a relation electrode between life

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.99-102
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• 2006

We developed the electronic ballast for the street HID lames with the leakage current detection and circuit breaker function. By detecting the leakage current and breaking the system we are protected from the electric shock and the ballast is safe from the electric damage at the time of the continuous reignition state.

• 한국농촌건축학회논문집
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• 제14권4호
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• pp.117-124
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• 2012

The purpose of this study is the impact of the typhoon damage to housing and facilities in rural areas. House of damage, as well as the only including damage of facilities in rural areas, particularly greenhouse(Glass greenhouse, Plastic greenhouse, Vinyl greenhouse) leads to damage of crops the scale of the damage increases. In this study, focused on Jeollabuk-do area, accompanying him, the number of gale damage and evaluate the extent of the damage to the typhoon. And aims to provide basic data for the rural areas of strong winds and typhoons preparedness and facility design based on the results. Judging from the results of the analysis of natural disasters caused by typhoons and strong winds, the city formed mainly in the area than in the plains or coastal rural areas compared to other areas more damage can appear. In recent years, many design maximum wind speed of 40m/s wind over because disaster type, even if the standard installation, preferably determined through a precise structural analysis to ensure the structural history of acting urgently.

• 한국가스학회지
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• 제22권6호
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• pp.1-7
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• 2018

최근 화학공장에서 사고가 빈번히 발생하여 화학공장의 위험성에 대한 논란이 다시 대두되고 있다. 화학공장에서 발생하는 사고유형은 대부분 화재, 폭발, 누출사고이다. 화재, 폭발사고의 경우는 사고발생 직후 사상자가 발생하지만 누출사고는 즉각적으로 대처하지 못해 사상자가 발생하는 경우가 많다. 특히 화학물질이 피부에 침투하는 경우는 즉시 물로 씻어주면 사망, 실명, 화상과 같은 비가역적인 건강장애를 예방할 수 있다. 이렇게 화학물질이 피부, 눈 등에 노출된 경우 씻을 수 있는 장소가 바로 세안 등의 설비(이하 safety shower)이다. 하지만 국내 화학공장은 대부분 1980년대에 건설되어 노후화, 관리미흡 등으로 safety shower가 비상상황 시 정상 작동하지 못하는 경우가 많다. 따라서 설치/관리기준을 통해 safety shower에 대한 성능을 확보하는 것이 필요하다. 이 논문에서는 safety shower의 설치 및 점검기준을 통해 safety shower의 신뢰도를 향상시키는 연구를 수행하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.190-195
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• 2008

Surge proof equipment is an installation to make surge flow on the ground promptly so as to reduce surge-related damage on infrastructure, not to prevent surge from falling down on infrastructure directly. Compared with classical line individual earth, High speed line common earth has higher surge characteristic and plays a significant role to prevent infrastructure damage and injuries from surge, or short circuit accident between 25kV catenary and rail. In this paper, we analyzed the case of accident that caused communication/signaling system impaired while a tractor crossing level crossing at Honam line; in addition, we examined the accident reduction measures to minimize injury and property damage from cutting accidents with respect to common earth network.

• Structural Monitoring and Maintenance
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• 제7권2호
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• pp.125-147
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• 2020

Damage detection of structures is one of the most important topics in structural health monitoring. In practice, the response is not available at all structural degrees of freedom, and due to the installation of sensors at some degrees of freedom, responses exist only in limited number of degrees of freedom. This paper is investigated the damage detection of structures by applying two approaches, AllDOF and Dynamic Condensation Method (DCM), based on the Modified Modal Strain Energy Method (MMSEBI). In the AllDOF method, mode shapes in all degrees of freedom is available, but in the DCM the mode shapes only in some degrees of freedom are available. Therefore by methods like the DCM, mode shapes are obtained in slave degrees of freedom. So, in the first step, the responses at slave degrees of freedom extracted using the responses at master degrees of freedom. Then, using the reconstructed mode shape and obtaining the modified modal strain energy, the damages are detected. Two standard examples are used in different damage cases to evaluate the accuracy of the mentioned method. The results showed the capability of the DCM is acceptable for low mode shapes to detect the damage in structures. By increasing the number of modes, the AllDOF method identifies the locations of the damage more accurately.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1953-1959
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• 2011

지하철 역사 특성상 천장내 시설물의 잦은 교체, 증설, 점검 등에 따른 시설물의 지지철물(강-앙카) 설치와 천장내부 작업자의 이동 등으로 천장마감재의 훼손 및 콘크리트 구조물의 피해가 우려되고 공사비 증가의 요인이 되고 있다. 또한 공사중 발생되는 소음, 진동, 미세분진 등으로 역사 이용환경이 저해되고 민원이 발생하여 공사관리에 어려움이 있다. 따라서 천장시설물의 지지철물 시공방법을 개선하여 작업의 편리성, 경제성, 효율성 등을 고려한 천장틀 시공방법을 제시코자 한다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.327-331
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• 2007

Inundation of substation and underground power equipment(pad-mounted transformers & switches) breaks out every summer season in low-lying downtown and low-lying shore by localized heavy rain, typhoon and tidal wave. In case inundation of substation and underground power equipment, it occurs a great economic loss owing to recovery time and events of electric shock occur by inundation electrical facility. So we search the damage situation and installation situations. Therefore we propose the necessity of protection of flood at low-lying downtown and low-tying shore. This paper will be used to present a reform proposal of electrical related law about flood protection of existing power equipment.