• Journal of architectural history
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• v.15 no.5
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• pp.41-56
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• 2006

Signal fire was a communication system which deliver urgent news by smoke and light. It informed the condition of the border to the central government and the military base rapidly. This research was to analyze the border signal-fire which is the main facility of military protective duty for safety of sea side in chosun dynasty. The results of this research were described separately as follows. 1. The border signal-fire has three types of facility layout, The majority was one-site, near two-site, separate type. The majority was near two-site type. 2. Plan configuration of signal-fire stand which is separated with circle, oval, round-rectangular and rectangular type roughly was constructed with circle type generally. Four types of signal-fire stand was observed in southern and western sea side impartially. However, in eastern side, circle type of signal-fire stand was mainly found. Therefore, regional characteristics could be considered partially. 3. The height of signal-fire stand was about 8~10m. The diameter of combustion chamber on the signal-fire stand was 2~3m in circle type, and the dimension of rectangular type was about $1.9{\times}1.9{\sim}3.2{\times}3.0m$. 4. Building base that protect ground moisture and infilteration of rainfall was found in 10 border singal-fire, the height of it was about 0.3m~2.5m.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.48 no.3
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• pp.13-20
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• 2011

In this paper, we proposed a system to raise gas safety management by using the wireless communication module and intelligent gas safety appliances. Our designed systems configure a micom-gas meter, an automatic extinguisher, sensors, and a wallpad. A micom-gas-meter monitors gas flow, gas pressure, and earthquake. An automatic fire extinguisher checks gas(combustible) leaks and temperature of $100^{\circ}C$ and $130^{\circ}C$. Sensors measure smoke and CO gas. In our novel system, a micom-gas meter cut off inner valve with warnings, an automatic fire extinguisher cut off middle valve and spray extinguishing materials, and sensors generate signals for smoke and CO when occurring gas risk. Gas safety appliances and sensors takes safety measures, and transmit those signal to a wallpad. The wallpad again transmit signal like events to a control server. Users can connect web pages for gas safety through B-ISDN and control and manage them. We hereby devised scenarios for gas safety and risk management, and demonstrated their effectiveness through experiments.

• Korean Journal of Food Science and Technology
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• v.49 no.3
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• pp.252-257
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• 2017

In this study, the physicochemical properties of irradiated (gamma-ray and electron-beam) soybeans with different processing (dry and powder) and origins (Korea, China, and USA) were investigated and compared. The results of photostimulated luminescence (PSL) screening indicated that all non-irradiated soybeans showed photon counts (PCs) ${\leq}700$, while all irradiated soybeans showed positive values-gamma-ray 5,815-39,591 count/min; electron beam 5,791-60,055 count/min. The results of thermoluminescence (TL) analysis of all irradiated soybeans indicated that the $TL_1$ glow curves exhibited maximum peaks at 150-250. TL ratio of irradiated samples was ${\geq}0.1$; therefore, the clear identification of irradiated samples was guaranteed by analysis of the $TL_1$ curve shape and TL ratios. The results of electron spin resonance (ESR) signal of 3 irradiated and dried soybeans showed two side peaks mutually spaced at 6.0 mT (cellulose radical). Non-specific signal was detected for all irradiated soybean powders; hence, ESR analysis could not be performed.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.705-706
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• 2015

본 논문은 선풍기 모터의 회전을 정상, Jam상태(정격속도의 20%이내), 구속상태로 구분하여 주권선에서의 온도특성 및 전류를 분석하여 전기화재 위험성을 제시하는 것을 목적으로 하고 있다. 온도의 경우 정상상태 $61^{\circ}C$, Jam상태 $113^{\circ}C$, 구속상태 $133^{\circ}C$로 측정되었다. 선풍기의 경우 대부분의 전기배선이 모터의 고정자 철심에 부착되어 있으며 전선의 허용온도가 $60^{\circ}C$인 점을 감안했을 때 절연열화가 가속될 수 있다. 전류의 경우 정상상태와 구속상태의 차이가 35mA로 가장 높게 났다.

• International Journal of Railway
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• v.2 no.3
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• pp.127-130
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• 2009

The system improves the safety and efficiency of railway transport, combining the advanced axle-counter with single-track semiautomatic block. Using computer, to accomplish relay-based semiautomatic block logic operation and axle-counter to check section status, it will further increase the performance of railway transport. Safety-related communication is one of the important topics in railway signal system. By referring to relevant safety-related communication standards, to research on safety-related communication of Micro-computer automatic block between Railway Stations System, the thesis introduces the basic requirements, concept model, codes, and the process, etc.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1964-1969
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• 2008

A railway is a complex system integrated with a lot of technical elements such as rolling stock, power, signal control, communications, tracks, stations, operation control systems, and so on. As a mass transportation system, a railway could contain potential risks that may result in a high death rate and property losses. Accordingly, Railroad Safety Technology R&D Corps. is adopting the plan of the construction of Railway Safety Test Facilities as a part of the Railway Total Safety Project to enhance the railway safety, and carrying out researches on effective project management methods with Systems Engineering techniques. To support that, we propose the more effectual management method of constructing the Railway Safety Test Facilities applying the model-based systems engineering tool to the research.

• Proceedings of the KOR-KST Conference
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• 2007.02a
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• pp.341-347
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• 2007

• Transportation Technology and Policy
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• v.7 no.1
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• pp.93-102
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• 2010

• Journal of Korean Society of Transportation
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• v.21 no.6
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• pp.67-73
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• 2003

This study preformed a research about the traffic signal light that is adding supplementary green light to prevent driver's cognitive errors and plan safe driving through improving visual cognitivity of present traffic signal light. The result of comparing the present traffic signal light(three colors, four colors) with the traffic signal light(three colors, four colors) adding supplementary green light through car simulator has a significant difference. This result shows possibility that the traffic signal light adding supplementary green light can contribute in safety driving at a point that the traffic signal light advances a point of braking time when drivers didn't recognize by themselves. The findings in this study ca say that there is the meaning in showing a actual application possibility of this study finding by investigating a action of subjective response the moment compare driver's actual response.

• Journal of Power Electronics
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• v.16 no.2
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• pp.805-814
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• 2016

Electric-field coupled power transfer (ECPT) systems have been proposed as an alternative wireless power transfer (WPT) technology in recent years. With the use of capacitive plates as a coupling structure, ECPT systems have many advantages such as design flexibility, reduced volume of the coupling structure and metal penetration ability. In addition, wireless communications are effective solutions to improve the safety and controllability of ECPT systems. This paper proposes a power and signal shared channel for electric-field coupled power transfer systems. The shared channel includes two similar electrical circuits with a band pass filter and a signal detection resistor in each. This is designed based on the traditional current-fed push-pull topology. An analysis of the mutual interference between the power and signal transmission, the channel power and signal attenuations, and the dynamic characteristic of the signal channel are conducted to determine the values for the electrical components of the proposed shared channel. Experimental results show that the designed channel can transfer over 100W of output power and data with a data rate from 300bps to 120 kbps.