• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.2413-2425
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• 2008

Until now, Many papers were written by graduate school students and consultents about railway station as main consideration. But there is no paper about specific private-invested station development. So in this paper, Just consider limiting Dong-Incheon private-invested station on a noncompetitive point of view that also constructed as a part of railway station development. This paper will be referenced of private-invested station management and direction of development in Korail railway station development. Private-invested station development is actively drived to now after Seoul private-invested station in 1989 as Korail's first induced private capital. Dong-Incheon private-invested station also built in 1989 and operated to now, but it can't keep up with current market and can't meet changeable commercial business. So in this paper, comparing Dong-Incheon private-invested station with one of the successful private-invested stations which is youngdengpo private-invested station and seeking the improvement direction of Dong-Incheon private-invested station as considering Dong-Incheon private-invested station's floating, traffic system, walking line, the range of station, the development type, facilities, and other nation's developing cases.

• 한국조명전기설비학회지:조명전기설비
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• 제8권3호
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• pp.27-35
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• 1994

네온사인의 점멸에 의한 절전방안을 강구하기 위한 연구로서 1[kW]규모의 네온사인을 제작하여, 점멸속도 및 점등시간비 등의 변화에 따른 네온사인의 소비전력량을 조사하였다. 본 실험에서 점멸주기(T)는 1.0, 2.0, 4.0 및 8.0[sec]이며, 점등시간비(D)는 25, 50, 75 및 100[%]로 설정하였다. 정밀한 측정 데이터를 얻기 위하여 전력에너지 분석기가 사용되었다. 실험결과, 점멸주기(T)가 2.0[sec]보다 큰 경우 네온사인의 소비전력량은 T의 변화에 영향이 없으나, 그 이하인 경우에는 소비젼력량이 감소되었다. T 및 D가 다같이 작은 경우에 소비전력량은 최소가 되며, 본 실험 조건에서 T=1.0[sec] 및 D=25[%]인 경우 소비전력량은 연속점등시에 비해 83.0[%]의 감소를 보였다.

• 한국공간구조학회논문집
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• 제8권3호
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• pp.65-73
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• 2008

본 연구에서는 음향적으로 결합된 공간에서 개구부의 크기변화에 따른 주관적 잔향감의 평가를 청취실험을 통해 실시하고 주관적 잔향감을 예측할 수 있는 새로운 물리적 지표를 제시하고자 하였다. 대상공간의 물리적 음향특성은 물론 주관적 음향평가를 위하여 1/10 스케일의 모형을 제작하여 실험에 사용하였다. 주관적 잔향감평가를 위해 바이노럴 임펄스 리스펀스(binaural impulse response)를 더미헤드(dummy head)를 이용해 녹음하여 가청화작업(auralization)을 거쳐 청취실험에 음원으로 제시하였다. 청취실험결과, 주실이 흡음력이 낮은 잔향부실과 음향적으로 결합할 경우 개구율이 12.5%(주실면적대비 1.97%)일 때 주관적 잔향감이 가장 큰 것으로 나타났으며 개구율이 25%(주실면적대비 3.94%)이상일 때 주관적 잔향감이 감소하는 것으로 나타났다 주실이 흡음력이 높은 흡음부실과 음향적으로 결합할 경우 개구율이 $0%{\sim}6.25%$까지(주실면적대비 $0%{\sim}0.99%$)는 주관적 잔향감이 변화하지 않다가 개구율이 12.5%에서부터 점차적으로 감소하는 것으로 나타났다. 이중감쇠현상을 나타내는 물리적 지표 T30/T15는 개구율의 변화에 따른 주관적 잔향감과 상관도가 거의 없는 것으로 나타났으며 저자들이 제시한 새로운 지표 T30/Tbp이 주관적 잔향감과 높은 상관도를 보였다. 또한 개구율 변화에 따른 이중감쇠현상은 초기나 중기감쇠부분에서보다 후기감쇠부분에서 에너지가 현저하게 증가하는 것으로 나타나 T30/T15에 비해 LDT/EDT나 T3/T1가 주관적 잔향감과의 상관성이 높은 것으로 나타났다.

• Structural Engineering and Mechanics
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• 제54권1호
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• pp.105-119
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• 2015

Structural damage detection using modal strain energy (MSE) is one of the most efficient and reliable structural health monitoring techniques. However, some of the existing MSE methods have been validated for special types of structures such as beams or steel truss bridges which demands improving the available methods. The purpose of this study is to improve an efficient modal strain energy method to detect and quantify the damage in complex structures at early stage of formation. In this paper, a modal strain energy method was mathematically developed and then numerically applied to a fixed-end beam and a three-story frame including single and multiple damage scenarios in absence and presence of up to five per cent noise. For each damage scenario, all mode shapes and natural frequencies of intact structures and the first five mode shapes of assumed damaged structures were obtained using STRAND7. The derived mode shapes of each intact and damaged structure at any damage scenario were then separately used in the improved formulation using MATLAB to detect the location and quantify the severity of damage as compared to those obtained from previous method. It was found that the improved method is more accurate, efficient and convergent than its predecessors. The outcomes of this study can be safely and inexpensively used for structural health monitoring to minimize the loss of lives and property by identifying the unforeseen structural damages.

• 한국주거학회논문집
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• 제20권3호
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• pp.19-26
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• 2009

The purpose of this study is to classify roof styles about high-rise apartment complexes in these days. Specially, it is focused on those in Daegu city. It has analyzed for 75 apartment complexes in Daegu city. Those complexes are all over 300 houses each and were built from 2004 to 2007. Generally, roof styles about high-rise apartment complexes are classed as a flat roof style and a slope-sided roof style. Types of the flat roof style were divided a flat roof style and a eyebrows roof style. And, types of the slope-sided roof style were divided a single slope-sided roof style, a gable roof style, and a hipped roof style. The curved roof style didn't show up at these cases. According to this study, the slope-sided roof style including the gable roof style was revealed the most common roof style about high-rise apartment complexes in Daegu city from 2004 to 2007. Among 76 cases of roof styles, the number of the gable roof style is 52, and the number of flat roof style is 18. Each roof style was changed for more decorative shape. Specially, in case of the flat roof style, 17 cases for 18 cases are built as a decorative flat roof style. and, 15 for 52 gable roof style cases are built as a decorative style, too. According this case study, we are able to know that the sort of roof style was advanced variously and decoratively, and the shape of roof style was combined more than 2 decorative factors. The roof style of high-rise apartment complex in future will be more various and decorative than this time and will be develop compositively.

• 교육시설
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• 제11권6호
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• pp.4-12
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• 2004

This research has a purpose to review architectural education in the early modern times in Korea. Although the mission school had some programs on basic woodworks, which were for architectural technicians afterwards, it has not been paid attention yet. Missionaries recognized the problematic situation that the most western-styled building all over Korea were built by Chinese or Japanese technicians, and they made up the minds and tried to train Korean apprentices. This training program couldn't be developed to the authorized curriculum, and moreover was limited that it was concentrated on just woodwork training; however, the missionaries made their best endeavor to overcome the deficiency of skillful technicians. At the woodwork department of the mission school there were occasionally effective programs, for example, a training of drawing or an actual participation at the real construction site. Mission schools could be said to offer the helpful programs for the early education on newly coming architecture.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(II)
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• pp.417-422
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• 2003

Rockfall mitigation methods have been widely constructed along railway lines but aren't estimated with any economic analysis methods up to now. Therefore, this study applied a benefit-cost analysis to rockfall mitigation method to determine whether it is indeed an economically efficient construction. The Benefits were estimated based on data collected from disaster history, and included three types of benefits that are originated by reduction of train accident, train delay and rockfall removing cost. The costs included both construction cost and the maintenance cost of the selected method. This analysis could clarify the investment effect of rockfall mitigation method that would be built at rockfall prone slope.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.300-303
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• 2004

In this paper, floor impact noise reduction in a cruise ship cabin by using floating floor is studied. A mock-up is built by using 61 steel plate, and two identical cabins are made where 25t panel is used to construct wall and ceiling inside the steel structure. Various floating floor systems are tested for which normalized impact noise is measured according to ISO 140-7 It is shown that effect of VL(Visco-elastic Layer) is negligible when it is used between deck and mineral wool, since most vibration absorption occurs in the wool. In addition, direction of the mineral wool fiber affects impact noise significantly.

• 한국초전도저온공학회:학술대회논문집
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• 한국초전도저온공학회 2000년도 KIASC Conference 2000 / 2000년도 학술대회 논문집
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• pp.147-149
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• 2000

Samsung Superconducting Test Facility (SSTF) will be built at SAIT, Taejeon. The superconducting cables to be used for KSTAR magnets are going to be tested in SSTF. The background magnet in SSTF is needed to simulate harsh magnetic environment for testing short CICC samples as well as full-scale magnets. The main coils can make central magnetic field of up to 8 Tesla and the blip coils can maintain fast ramping rate of 20T/s. The cancellation coils reduce the disturbance of main coils due to blip coils. The magnetic field distribution of these coils has been obtained with finite element method as well as the direct integration method.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 B
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• pp.465-467
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• 1997

The CD Trend Recorder, developed as a substitution of the existing SCR (Stript Chart Recorder), acquires various outputs (e.g. frequency voltage, current, power, temperature, pressure, etc) simultaneously using PC up to 32 different outputs, display, and analyze them just like the existing SCR. It stores the data in CD-ROM so th various data can be stored permanently this system has built-in MMI program and to monitor and analyze the data in real-t expert system link the data to the do where needs the data to display, analyze, in the new medium at the same time.