• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2006년도 하계학술발표대회 논문집
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• pp.1144-1149
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• 2006

Electric power is generated by Seeback Effect if there is thermal difference in pettier module. Peltier module is composed by alumina, Bi-Te semiconductor and insulation (or air). If load is increased in pettier module, the alumina of module will be destroyed. One of the preventing method of module destruction is using damper between module and heat source. But the electric Power is dropped because of decrease of thermal difference, if thermal conductivity of damper was tourer than other thermoelectric materials. We design, Polymer Pad for enhancing thermoelectric porter. As the result of these experiment, Polymer Pad is more superior than the Rubber in the stability and thermal conduction.

• 대한한의진단학회지
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• 제18권3호
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• pp.217-223
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• 2014

Objectives This study is on the implementation of the electric cauterizer with the hole for acupuncture to achieve the superposition effect of acupuncture-moxibustion therapies. Methods In this paper, we especially made a hole across the heat terminal of the electric cauterizer for acupuncture. Before the cauterization, the doctor treats a patient with needle. And after acupuncture, the heat terminal is to be superposed upon the needle along the hole to add the cauterization. Results There are 2 coupling methods that the heat terminal is to be superposed with the needle; one is the top-coupling and the other is side-coupling. The top-coupling means that the heat terminal is to be superposed upon the needle along the top of the needle, and side-coupling means that the heat terminal is to be superposed to the needle along the side of the needle. Conclusion This study was aimed to implement the electric cauterizer with the hole for acupuncture to achieve the superposition effect of acupuncture-moxibustion therapies. Not electric acupuncture but manual acupuncture is adopted. The electric cauterizer generates the heat $38{\sim}45^{\circ}C$. This heat is safe for skin not to burn. The electric cauterizer constitutes the smokeless moxa- pad which effects the skin DDS.

• 대한전자공학회논문지TC
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• 제37권6호
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• pp.36-43
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• 2000

두 개의 마이크로 스트립 선로를 이용하여 결합한 유전체 공진기를 유한 차분 시간 영역(FDTD)법을 적용하여 3차원 해석을 하였다. 유전체 공진기의 표면은 곡면으로서, Noriaki model을 이용하여 정확하게 모델링 하였다. 일반적인 FFT에 의해 106.46 MHz의 주파수 해상도를 얻었지만 공진 주파수를 결정할 수가 없다. 따라서 1.00 MHz의 높은 주파수 분해능을 갖기 위해서 Pad 근사법과 Stoer-Bulirsch법을 적용하고 측정치와 비교하였다. 그 결과 Pad 근사법을 통하여 매우 정확한 공진주파수를 얻었다. 그리고 정현파를 인가하여 전자계 분포를 도시하였으며, 공진 모드가 TE/sub 01δ/ 모드임을 알 수 있었다.

• 한국유체기계학회 논문집
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• 제12권6호
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• pp.33-40
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• 2009

The temperature of vertical pump bearing metal in the pumped storage power plant has been high enough to shutdown the unit. Attempts such as decreasing the oil supply temperature, increasing the bearing oil gap etc. were performed to resolve the problem, but the issue was not resolved. Finally, the high bearing metal temperature was corrected by adjusting the bearing preload. The preload is formed by the oil wedge between the journal surface and bearing pad surface and the degree of preload is determined by the machined radial clearance, assembled radial clearance, rotor journal diameter etc. This paper focuses on the analysis of the preload depending on the bearing parameters and the result of the modification of the bearing following the analysis. The bearing metal temperature dropped as much as $20^{\circ}C$ which was similar as expected by software calculation. But the shaft vibration could increase when the assembled radial clearance is excessive. So, the adjustment of the bearing preload for the tilting pad type journal bearing should be carefully performed.

• Tribology and Lubricants
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• 제34권1호
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• pp.16-22
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• 2018

Cylindrical turbine guide bearings (TGBs) with simple plain pads have conventionally been used in vertical hydro-power turbine-generator applications in order to provide turbine runner shafts with smooth rotation guides and supports. To overcome low-load/low-eccentricity performance drawbacks, such as very low film stiffness and lack of design credibility in the stiffness values themselves, of conventional cylindrical TGBs, the introduction of a rotational-directional leading-edge taper to each partitioned pad, simply pad leading-edge taper, has been found to be very effective in enhancing their design-application availability and usefulness. In this study, we investigate the effects of taper angle and length for given taper heights in detail in order to systematically establish the effectiveness of design on the performance improvement of vertical hydro-power application cylindrical TGBs with pad leading-edge tapers. The analysis results with $4-Pad{\times}1-Row$ cylindrical TGBs show that the lubrication performance of the cylindrical TGBs is optimized with an approximate taper angle ratio of 0.8 and taper length ratio of 0.9. We conclude that the introduction of pad leading-edge tapers along with the optimization of taper designs can be very effective in improving the overall operation reliability of cylindrical TGBs and the rotordynamic characteristics of vertical hydro-power turbine-generator rotor-bearing systems as well, to which the TGBs are applied.

• 대한전자공학회논문지TC
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• 제37권6호
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• pp.396-396
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• 2000

두 개의 마이크로 스트립 선로를 이용하여 결합한 유전체 공진기를 유한 차분 시간 영역(FDTD)법을 적용하여 3차원 해석을 하였다. 유전체 공진기의 표면은 곡면으로서, Noriaki model을 이용하여 정확하게 모델링 하였다. 일반적인 FFT에 의해 106.46 MHz의 주파수 해상도를 얻었지만 공진 주파수를 결정할 수가 없다. 따라서 1.00 MHz의 높은 주파수 분해능을 갖기 위해서 Pad 근사법과 Stoer-Bulirsch법을 적용하고 측정치와 비교하였다. 그 결과 Pad 근사법을 통하여 매우 정확한 공진주파수를 얻었다. 그리고 정현파를 인가하여 전자계 분포를 도시하였으며, 공진 모드가 $TE_{01{\delta}}$ 모드임을 알 수 있었다.

• 소성∙가공
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• 제6권3호
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• pp.192-202
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• 1997

This study presents an effect of number of passes in wire-cut electric discharge machining on fine blanking dies and products. Three part fine blanking dies were produced by the difference of numbers of passes discharge machining. Brake pad was produced, through the die produced like that, the objective of this study is the improvement in surface roughness of die block and punch, life extension of die block, the decrease of second fracture dimensions, the rise of productive.

• 한국화재조사학회학술대회
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• 한국화재조사학회 2011년도 제21회 춘계학술대회
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• pp.98-101
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• 2011

• KEPCO Journal on Electric Power and Energy
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• 제8권1호
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• pp.5-7
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• 2022

KEPCO's plan is undergoing a trial operation to replace the open-loop section with ring main units configuration where underground distribution lines are installed, by linking the multi-way circuit breakers auto (MCA) on the power side of each pad-mounted transformer. However, ring main units application mentioned above may cause the ripple effects, when implementing the configuration without a study of protection coordination. Because ring main units with classical pre-set protection devices contribution in fault condition didn't consider yet. For the reliable ring main units operation, it is necessary to resolve several protection issues such as the protection coordination with substation side, prevention of the transformer inrush current. These issues can radically deteriorate the distribution system reliability Hence, it is essential to design proper protection coordination to reduce these types of problems. This paper presents a scheme of ring main units' configuration and MCA's settings of time-current curves to preserve the performance of protection coordination among the switchgears considering constraints, e.g. prevention of the ripple effects (on the branch section when a transformer failure occurs and the mainline when a branch line failure occurs). It was confirmed that the propagation of the failure for each interrupter segment could be minimized by applying the proposed TCC and the interrupter settings for the MCAs (branch, transformer). Further, it was verified that the undetected area of the distribution automation system (DAS) could be supplemented by having the MCA configurated ring main units operate first, instead of the internal protection equipment in the transformer such as the fuse, STP when a transformer failure occurs.

• 대한화상학회지
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• 제22권2호
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• pp.21-24
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• 2019

Incidence of low-temperature contact burn by use of an electric pad is increased recently, especially in depressed sensory. Acquired immune deficiency syndrome patient using antiretroviral agent suffered with sensory depression as side effect. There are many limitations in wounds treatment of these patients. These patients are vulnerable to infection due to their weak immunity, so it is necessary to keep them in a state of isolation when a wound occurs. We report a case of a third degree burn by electric pad with a surface area of approximately 5% of the body surface of a patient who underwent a sensory depression, which is a side effect of antiretroviral drugs used for treatment in patients with AIDS. In this regard, we report the case with literature review, which is safely recovered using negative-pressure wound therapy and split-thickness skin graft.