• Journal of Navigation and Port Research
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• 제31권6호
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• pp.463-470
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• 2007

Each on-board equipment providing navigational and engine information has different signals. These signals should be analyze, be transformed to the standard digital form and be transmitted to each client on board through the earlier developed ILU (integrated LAN unit). Therefore this paper was to analyze the signals of each equipment for navigation and engine and was to use the serial technology necessary for the equipment and IDU (information display unit). And this paper was then to develop an SIU (ship's interface unit) and to test it onboard.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 한국항해항만학회 2006년도 추계학술대회 논문집(제1권)
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• pp.139-146
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• 2006

Each on-board equipment providing navigational and engine information has different signals. These signals should be analyzed, be transformed to the standard digital form and be transmitted to each client on board through the earlier developed ILU (integrated LAN unit). Therefore this paper is to analyze the signals of each equipment for navigation and engine and the serial technology necessary for the equipment and IDU (information display unit), and then develop an SIU(ship's interface unit).

• Journal of the Korea Academia-Industrial cooperation Society
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• 제10권5호
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• pp.935-941
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• 2009

In this paper, we study the communication based train control technology which has been improved for the railroad operation efficiency. All the signalling systems currently used in Korea are track circuit based train control systems, which train mobility and safety are considered on. When it comes to the recent abroad trend, development for communication based train control system, which arises new paradigm in the field of high density train separation, have been promoted. Considering the urgent necessity to develop the above mentioned technology, we would like to propose the research and development of communication based train control system and the present domestic and foreign statuses of on-board equipment development. In this paper, therefore, we had been developed localization on-board equipment of communication based train control system, which is the key construction of train control systems. For its verification, we accomplished installation and yard test on-board equipment of communication based train control system on Bundang-line's EMU(Electrical Multiple Unit).

• Transactions of the Korean Society for Noise and Vibration Engineering
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• 제26권4호
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• pp.365-374
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• 2016

The underwater radiated noise can be reduced by decreasing the structure borne noise of the on-board equipment. Therefore, the structure borne noise of the onborad installed equipment is strongly restricted by ROK navy with MIL-Std 740-2. Usually, the vibration transmissibility from the equipment to the hull of the ship is dependent on its mount characteristics. Even though the double mount structure is proper to apply for ship board application rather than single mount, it is not widely applied due to the weight and volume resriction of the ship. Therefore, in this research, the base using sandwitch panel which can act as double mount structure is suggested and its noise reduction capacity is verified with analytic calculation as well as experiment.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 한국신호처리시스템학회 2000년도 추계종합학술대회논문집
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• pp.41-44
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• 2000

In this paper, the dedicated short range communication(DSRC) system which used as the automatic gate system(AGS) Donga Univ. RRC developed is applied to yard automation. We proposed the communication algorithm of between roadside equipment(RSE) and on-board equipment(OBE). We analyzed transmitted and received information, classification and feature of between OBE and RSE for automation of the container yard and unloading system.

• Journal of Fisheries and Marine Sciences Education
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• 제10권1호
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• pp.87-99
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• 1998

For the purpose of increasing the efficiency of practices on board in the education of oceanography by the oceanographic research vessel "Tamyang", the problems which were generated while maneuvering the vessel for the practices were examined thoroughly, the proposals for the improvement of the above problems were summarized as follows : 1. The career of cruise for research should be recognized as the credit of practice on board by the training ship, the chances for credits of practice on board should be provided more and the demand of research assistant should be satisfied. 2. The special programs for the practice on board in the education of oceanography should be developed for increasing the educational and economical efficiency during the practice. 3. The research cruise should be enlarged fir providing the more chance of study to the professor. 4. The supplementary practice on board should be carried out in the vacation. 5. The budget for purchasing the spares of research equipment should be allotted and the expert technician should be supplemented for the maintenance and instruction.

• The Journal of the Korea institute of electronic communication sciences
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• 제8권12호
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• pp.1905-1910
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• 2013

This paper demonstrates the result of Safety Integrity Level (SIL) allocation for IL-type Train Control System(IL-TCS), by applying the semi-quantitative approach. IL-type TCS is defined in this paper as the set of Hardware and Software ATS equipment, Track-side ATP equipment, On-board ATP equipment, Track-side ATO equipment, On-board ATO equipment. SIL allocation is performed for these constituent subsystems of TCS. Based on three principles of the semi-quantitative method, the SIL allocation process is performed for the subsystems composing TCS.

• The Transactions of The Korean Institute of Electrical Engineers
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• 제61권3호
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• pp.384-393
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• 2012

Railroad signaling systems perform controlling the distance and routes between trains. Signaling methods on the wayside are to control passively the train speed by using signal flags which are installed on the wayside. ATS(Automatic Train Stop) device is used as the signaling method on the wayside in Korea. The ATS device is assistance equipment of engineers. Signal information is transmitted by combining mutual inductance between the wayside transmitter and on-board receiver. The wayside transmitter performs changing oscillation frequency according to the signal information. The on-board receiver performs controlling the train by receiving the frequency. Currently, the oscillation frequency on the on-board receiver is 78[kHz] in case of normal state. When the on-board receiver is over the wayside transmitter, the oscillation frequency is changed by capacitors of the wayside transmitter according to signal flags. In case of changing the oscillation frequency, the waveform is modified in the wayside transmitter and on-board receiver. This phenomenon is that other signals or communication frequency are included. In this paper, electric model between the wayside transmitter and on-board receiver is suggested and frequency response in the wayside transmitter and on-board receiver including other signals is estimated by the coupling coefficient. Also, the value of coupling coefficient is proposed to exclude other signals and demonstrated by using Matlab and PSpice program.

• The Journal of Korean Institute of Communications and Information Sciences
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• 제39C권3호
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• pp.298-306
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• 2014

The railway signalling system for safe train operation regulates the train speed to ensure the safety distance between consecutive trains by using wayside facilities such as track circuits and interlocking systems. In addition, this signalling system controls the trackside equipment such as a railway point along the train line. This ground-equipment-based train control systems require high CAPEX and OPEX. To deal with these problems, the train control system using the on-board controller has been recently proposed and its related technologies have been widely studied. The on-board-controller-based train control system is that the on-board controller can directly control the trackside equipment on the train line. In addition, if this system is used, the wayside facilities can be simplified, and as a result, the efficient and cost-effective train control system can be realized. To this end, we have developed the prototypes of the on-board controller and wayside object control units which control the point and crossing gate and performed the integrated operation simulation in a testbed. In this paper, before the field test of the on-board-controller-based train control system, we perform the preliminary field trial including the installation test, wireless access test, interface test with other on-board devices, and normal operation test.

• Journal of KSNVE
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• 제10권6호
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• pp.971-976
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• 2000

High level random vibration environments induced while launching of spacecraft can damage sensitive electronic equipment, unless the equipment is properly packaged. Thus careful consideration on the launch environment, especially for high level random vibration, is required in the design stage of electronic equipment of spacecraft. This paper describes the development process of Solar Array Regulator for KOMPAT-2, which is designed and tested by Korean engineers. Both analytical and experimental techniques are introduced in this paper.