• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.319-320
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• 2006

At this study, one of the electrical problems, arc characteristics according to loss of contact between a pantograph and a catenary, was analyzed. A characteristic of arc current is disappeared in a short period of time. Nevertheless, it has large current same as a surge, so that it has EMI/EMC problems. In the case of the electrical railway system, there is oscillation and de-wiring. The are current is generated by these problems. The result of this study can be used as a facility design to prevent a surge and needs to prove through actual field data in the main circuit of an electric train for a precise analysis about effect of are.

• Proceedings of the KIEE Conference
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• 2005.11b
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• pp.80-82
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• 2005

There is a method for stringing conductors which is connected to a wire over transmission towers by helicopter or human power and the wire and conductors are pulled by an engine puller. The length of one string section is usually 4-6 km and 2-4 conductors are strung at the same time with a single wire. A tensioner is used to maintain the sag and a running board is installed between the wire and conductors to prevent the rotation of conductors but the variance in topology, the line angle and unequal wiring tension between conductors causes conductor rotation damage or the conductor connection point to breakaway when the pulley is passed. This paper presents a method to prevent conductor rotation during stringing by inserting a pulley in the running board and equally maintaining conductor tension by sling wire after developing and testing.

• Journal of Korean Foot and Ankle Society
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• v.21 no.4
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• pp.165-169
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• 2017

Secondary soft tissue injuries can occur from the pressure of the displaced fragment of posterior calcaneal tuberosity in calcaneal tongue-type fractures and calcaneal tuberosity avulsion fractures. The soft tissue injury can be prevented by immediate reduction of the displaced fragments. Various techniques can be used to fix the fracture fragments, but the stability of fixation and minimal invasiveness to soft tissue should be considered. This paper reports the successful outcomes of patients with soft tissue compromises in calcaneal tongue-type fractures and calcaneal tuberosity avulsion fractures. The fixation technique of a large cannulated screw and simple cerclage wiring is believed to be a useful surgical option for the treatment of secondary soft tissue compromised calcaneal fractures.

• Journal of the Korean Institute of Intelligent Systems
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• v.8 no.2
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• pp.1-8
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• 1998

In this paper, a method which cna detect tracking caused by the insulation deterioration of conduct wiring, is proposed. To investigate it, we analyzed the harmonics of each load current waveform and those of tracking current waveform with FFT. The computer which take experiment data is learned by neural network algorithm, which has recently been used for the load recognition. The proposed metod in our study can be applied to the development of several measuring equipments such as hotline insulation tester, cna earch tester for the detection of tracking under hot-line state, Furthermore, it can substitutes molded case circuit breaker, fuse, and so on.

• Proceedings of the KSME Conference
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• 2003.04a
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• pp.525-530
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• 2003

Recently an automobile industry is concerned about an automobile wiring harness system. It means that development of component modules is on the increase. An importance of the connector in one part of the modules will be enhanced. A connector is made of P.B.T. (Poly Butylene Terephthalate). PBT is resistant to the high temperature. This paper deals with thermal strain of connector. According as temperature increase, effects of the temperature and thermal strains give an analysis of the deformation using ABAQUS. This apparent thermal strain results actually from the variation of temperature. Being based on this analysis, axiomatic design applies to design parameters of the connector. As compared with CAE analysis, a performance improvement makes certain of the truth of the matter.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.58-63
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• 2005

It is an emergency which is in the process of existing using of passenger compartment equipment of the rolling stock to sprout and interphone wiring and by the fire sensor which perceives the smoke in the use passenger car ceiling the receiver which is to driver's cabin it leads and the fire occurrence alarm voice sprouts carried on shoulder but, by no. of the car indication ramp it divides the corresponding vehicle and from inside the passenger compartment of the rolling stock from fire occurrence hour driver's cabin corresponding passenger no. of the car. It is accurate and in order it will be able to perceive. It will be able to confront initially quickly with the technique which it composes. It is regarding the fire safety surveillance system it will be able to embody at the expense which is cheap in order to use existing wiring.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.234-240
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• 2010

Display Unit(DU) of TCMS is very useful device display many data for operation and maintenance graphically. At This Time, rolling stock is reducing the wiring and size of desk for cutting down on their cost and making light weight. Dual Du(Display Unit) of TCMS could make the desk of cab simply by integrating cab's switches and gauges. Dual DU is not only can reduce the wiring and simplify desk of cab but also can making system of TCMS reliable by including backup function each other. For this reason. In this paper, advantages, application and example analysis of Dual DU of TCMS for rolling stock are described through the ongoing projects.

• Proceedings of the KIEE Conference
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• 2006.04a
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• pp.336-338
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• 2006

One of the important topics concerning the safety of electrical and electronic system is the reliability of the wiring system. The Time-Frequency Domain Reflectometry(TFDR) is a state-of-the-art system for detection and estimation of the fault on a wiring/cable. The purpose of this paper is to implement a Labview based TFDR Real Time system though the instruments of PCI extensions for Instrumentation(PXI). The TFDR Real Time system consists of the five parts: Reference signal design, signal generation, signal acquisition, algorithm execution, results diplay part. In the signal generation and acquisition parts we adopt the Arbitrary Waveform Generator(AWG) and Digital Storage Oscilloscope(DSO) PXI modules which offer commonality, compatibility and easy integration at low cost. And execution of the PXI modules not only is controlled by the Labview programing but also the total system process is executed by the Labview application software.

• Congress of the korean instutite of fire investigation
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• 2010.12a
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• pp.91-119
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• 2010

There is an increasing number of car fires along with the increasing numbers of cars. The purpose of this study was to verify the possibility of fires caused by car tuning, which is one of the causes of car fires. The result showed that the possibility of car fires was increased by car tuning including replacement of headlights, excess of allowable current of wires or fuses by using multi cigar jacks, wire damage, earth fault, and vulnerability of wires and cables (sold in auto parts stores) to heat.

• 한국정보통신설비학회:학술대회논문집
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• 2006.08a
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• pp.7-10
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• 2006

FTTH service has been deployed since last year in the single dwelling unit environment. FTTH based on PON technology has many advantages in OPEX compared to FTTC solutions using the BBx. But this is not the case for the MDU environment where new wiring of the fiber cable in the customer premises network costs a lot of money. The purpose of Hybrid-FTTH is to overcome this problem by preserving the wiring environment of the customer premises environment in MDU but still guarantee the quality of service provided by FTTH. In this thesis, we present Hybrid-FTTH technology, especially focused on the DWDM-PON based Hybrid-FTTH technology and its development status.