• KIEAE Journal
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• 제2권1호
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• pp.49-54
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• 2002

Solar daylighting system provides free and comfort lighting, but its cost has been key issue due to difficult design and control of the heavy light collecting system. One of the solutions for the heavy design issues would be using a light framed film such fresnel and prism lens. Prism light guide luminaires have for some time been used to distribute light when it is desirable to have remote light sources. These systems are helpful when it is desirable to have fewer light sources, and/or to position light sources in places where lamp maintenance is easier, or electrical hazard is reduced. This proposed prototype system consists of light collector, light transformer and light pipe.

• 전기학회논문지P
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• 제55권2호
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• pp.110-114
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• 2006

This paper describes the accident analysis by modelling the current transformer mounting in a metal-clad switchgear at 22.9kV. In analyzing the accident, the reconstruction at the current transformer mounting(VCB connecting guide) has to be taken into account. The accident was modelled as a 3-phase ground fault occurring between the end plate of 22.9kV lines and the safety shutter at the current transformer mounting of the VCB inside the metal clad switchgear. Since the outside maintenance of the metal clad switchgear is restricted by the enclosed compartments, Its circumference has to be kept clean. Through the reconstruction results, it was confirmed that the fault of the enclosed switchboard could be reduced when the shutter made of Fe material was chanted into an insulation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1720-1721
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• 2007

This paper presents a Fuzzy+PID control method for a Bridge Inspection Robot(BIR) system. The BIR has been developed with the aim of checking the safety status of a real bridge, gathering accurate data and performing maintenance. The developed robot system is composed of the specially designed car for bridge inspection, the guide rail and the inspection robot. The proposed Fuzzy+PID controllers are used to track speed reference signal of X axis and position reference signal of Z axis. Experimental results verify that the proposed Fuzz+PID control design method can achieve favorable control performance with regard to external disturbance.

• 한국정밀공학회지
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• 제17권11호
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• pp.49-54
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• 2000

A field emission display has spacers separating the emitting base and display face. The arrangement of the spacer is important for maintenance of required clearance, endurance of bending stresses, and efficient vacuum sealing. Topology optimization technique with material density was introduced to select the best position of the spacers from the available positions. The displacement and Von Mises stress distribution of the panels with optimal spacers were calculated by finite element method. Also the design guide for adding eliminating spacers was proposed.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1994년도 FIFTH WESTERN PACIFIC REGIONAL ACOUSTICS CONFERENCE SEOUL KOREA
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• pp.791-795
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• 1994

In this paper, the echo phenomena of Yingying Pagoda(ancient Chinese architecture), which may be resulted from interferences of reflection and diffraction by the pagoda eaves when pulse sound source is at some suitable positions, are investigated by an 1:2 scale model. There are valleys in frequency spectrum due to the interferences. On the other hand, taking eaves as wedges approximately, numerical spectral estimates are obtained from the closed-form impulse solution for diffraction of pulse point-source radiation by an infinite rigid wedge. The results of the numerical computations are similar to those of the model experiments. The study is a helpful guide to reconstruction or maintenance of this kind of ancient buildings.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1485-1490
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• 2009

This paper discusses cases of infrastructure asset management in the U.S., Canada, and Australia and investigates infrastructure management in Korea in order to set the direction for the asset management improvement. The definitions of infrastructure asset management from various entities are introduced and implementation framework and organizational structures are described. The investigation on Korean public asset management practices finds the strong and weak points and defines the requirements and considerations to further improve the current practices. This paper will assist adopting infrastructure asset management in Korea and provide guide for the infrastructure maintenance.

• 한국실내디자인학회논문집
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• 제26권4호
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• pp.42-56
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• 2017

In Korea, which has three sides of the sea, various waterfront spaces are being developed and developed along with various coastal landscapes. However, there are a lot of cases that do not consider the regional characteristic of the coast or the characteristic of the coastal landscape. In many cases, the street facilities cause the landscape degradation and the use inconvenience because of incongruity with the scenery, aging and lax management. Therefore, it is necessary to reflect the specificity of the coastal landscape in planning and directing the street facilities, harmonizing with the surrounding natural environment, and consideration of sustainability. However, there is no research or planning index for sustainable street facilities considering the coastal characteristics. Therefore, this study suggests plan elements to improve the sustainability of the street facilities on the shore and proposes them as basic plan elements, and suggests what kind of improvements should be made to improve the sustainability of coastal facilities in Korea. Based on the plan elements derived from the plan, we checked the problems and complementary points of coastal street facilities in Korea by analyzing the current status of the street facilities around the Jeju Island beach from a sustainable point of view, and suggested plan indicators that should be supplemented to improve sustainability. We surveyed the street facilities such as walkway blocks, benches, pagoda, drinking fountain, trash cans, bicycle shelters, fences, guide maps, streetlights, and shower rooms in 10 beaches in Jeju Island. This study analyzed the sustainability characteristics of the each factor of these facilities by surveying the reflectivity of the 23 plan indicators from the six aspects derived from the sustainability planning factor as conformity, partial reflection, non - reflection, and nonconformity. The results of the analysis showed that the functional aspect was the highest with 68.3%, the material aspect (53%), the landscape aspect (22.3%), the productive aspect (14.7%) and the morphological aspect (12.2%), and maintenance / management (10.6%). In addition, the facilities with the lowest fitness in each aspect are bicycle shelter in landscape aspect, bicycle storage box and trash can in form aspect, shower room in material aspect, trash can in functional aspect, showroom, guide maps and drinking fountain in product aspect, showroom In maintenance aspect. In order to improve the sustainability of coastal facilities in the future, it is necessary to complement the administrative and landscape aspects. In coastal facilities, it is necessary to consider the sustainability planning index, especially for showers, taking into account the specificity of beaches. Consideration should be given to various aspects of sustainability for bike shelters and trash facilities. Through this study, we have proposed the plan elements to systematize, supplement, and improve the planning index for sustainability improvement in coastal facilities planning.

• 한국구조물진단유지관리공학회 논문집
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• 제20권1호
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• pp.104-111
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• 2016

최근 연구개발이 활발히 이루어지고 있는 철골 조립식주택은 공장에서 생산되고 현장에서 조립되는 건설방식의 특성으로 인해 일반 건축물의 철근콘크리트 바닥판과 같이 일체타설 시공되지 못하게 되며 부재 단면크기 감소 및 경량화 등으로 인해 거주자의 활동에 의한 바닥판의 수직진동 및 처짐이 사용성 평가 측면에서 중요한 문제가 될 수 있다. 따라서 이 연구에서는 대상 조립식주택에서 장변방향 보 중앙에 샛기둥이 설치된 모듈과 설치되지 않은 모듈을 대상으로 실무에서 일반적으로 사용되고 있는 AISC 설계지침서 11의 계산식(이하 AISC 계산식)을 이용하여 바닥판의 진동성능을 평가하고 범용해석프로그램을 이용한 해석결과와 비교를 통해 AISC 계산식의 적용성을 고찰하였다. 이를 토대로 샛기둥이 설치된 모듈의 바닥판에서 AISC 계산식과 해석결과의 오차가 크게 발생되는 구조적 원인을 분석하고 이를 고려하는 방안을 제시하였다. 또한 대상 조립식주택 바닥판에 대한 진동성능 향상방안을 변수로 해석모델을 수립하고 진동응답해석 및 경제성평가를 통해 진동성능과 경제성이 우수한 방안을 제시하였다.

• 한국환경복원기술학회지
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• 제8권2호
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• pp.83-89
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• 2005

The historical changes of seeding work in Japan, the typical slope revegetation method, is possible to divide into five periods as follows; 1) The early period after creation(1927-1948) 2) The spreading period of modern revegetation work with manpower(1947-1958) 3) The spreading period of rapid revegetation technique using exotic grasses with machineries(1959-1985${\dots}$) 4) The spreading period of rapid reforestation technique by fast growing species mainly using leguminous shrub species(1986-1995${\dots}$) 5)The developing period of nature restoration technique using endemic arborous species(1996-) The evaluation basis of vegetated condition after slope seeding has been described to a official guide book, "The Standards of Slope Stabilizing Works" It was mainly revised three times after first edition in 1972, and also the point of evaluation basis changed from the vegetation coverage to the density of woody plant through the 3rd period and the 4th period Recently main purpose of slope seeding has been developing from the erosion protection to the nature restoration in the current of the 5th period, and "The tentative guidelines of slope nature restoration" was announced by The Slope Revegetation Section of Japanese Society of Revegetation Technology in 2004. It was proposed the planning techniques of using suitable seeds/plants based on the preservation level at the real each construction sites Consequently, at present the importance of advanced monitoring methods for vegetation maintenance and plant sociologic survey to evaluate the plant succession is increasing.

• 한국측량학회지
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• 제23권1호
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• pp.31-38
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• 2005

국가 기반시설로서의 도로의 중요성은 상당한 비중을 차지하고 있다. 이에 따른 도로의 신설과 유지관리 비용은 지속적으로 증가하고 있다. 이와 같은 도로관리에 대한 비용 문제를 해결하기 위해서는 기본지리정보를 통한 합리적이고 효율적인 데이터관리가 필요하다. 그러나 현재까지의 기본지리정보 연구는 각 기관별 항목중심으로 연구되어 많은 양의 데이터가 중복구축 되었다. 이에 따라 국토지리정보원에서는 국제표준에 맞는 기본지리정보 지침안을 제시하였다. 본 연구는 동일한 데이터 가공에 대한 비용과 반복구축에 대한 비효율성을 방지하기 위하여 교통분야 기본지리정보를 적용한 도로관리 데이터모델을 제시하였다. 또한 위의 기본지리정보에 의해서 데이터모델을 개발한 사례가 많지 않다. 그렇기 때문에 기본지리정보 데이터모델 지침안이 실제 주제별 데이터모델 구축시 클래스, 속성, 관계 등이 실제 적용하기에 적절한지 고찰하였고 도로관리 데이터모델 실제 적용하였다.