• 한국산학기술학회논문지
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• 제19권2호
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• pp.117-124
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• 2018

본 논문은 KM-SAM 다기능레이더용 축류형 송풍기에 대한 국산화 개발 내용을 서술하고 있다. KM-SAM 다기능레이더는 중/저고도 위협표적을 탐지 및 추적하는 핵심 장비로 지속적인 외부 환경의 영향을 받는다. 이러한 장비의 원활한 운용을 위해서는 내부 온도 및 습기를 조절하는 송풍기가 필수적이며, 현재까지 다기능레이더용 송풍기는 전량 해외업체 수입에 의존하고 있다. 이러한 문제점 해결을 위해 국산화 개발 연구가 제안되었으며, 국산화 개발은 원제작사와 체계장비 규격 등 관련 기술자료 검토를 통한 요구도 분석, 시제품 설계, 성능시험 및 환경시험을 통한 설계요구조건 검증 등을 포함한다. 송풍기는 가이드 베인이 있는 축류형 팬으로 구성되고 모터는 최대 970 CFM의 풍량과 4.8 IWG 풍압을 발생하도록 제작되었다. 또한 신뢰성 있는 데이터 획득을 위해 AC 전원 공급기, 팬 성능시험기 및 데이터 수집 장비를 구축하여 시험평가를 수행하였으며, 시제품 모두 수입품 대비 동등수준 이상의 설계 요구도 검증이 이루어졌다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1444-1452
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• 2011

At present, Kyungbu high-speed railway is operated with 300km/h, Honam high-speed railway is being constructed with 350km/h, and the development for the overhead contact line system is to be conducted for the next-generation high-speed railway with the speed of 400km/h. It is necessary to set up the specification and criteria for the key parts such as dropper, termination clamp and tension insulator for the 400km/h railway line. In this paper, the specification and the criteria for dropper, termination clamp and tension insulator has been reviewed and proposed in order to secure long-term reliability and stability under the maximum speed of 400km/h. Also, the specification, criteria and international standards for 300km/h class and 350km/h class railway line system and the international standards related with the insulators have been reviewed, compared and analysed.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.428-432
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• 2008

The next Korean high speed train development project is started. In testing stage of this project, the 400km/h maximum speed test will be conducted. In Korean railway infrastructure conditions the 400km/h seems to be a critical speed especially in the aspect of the overhead contact lines. The current collection performance of the 400km/h which is predicted by dynamic interaction simulation are described in this paper. To discuss the permissible criteria of contact forces, displacements and percentage contact loss, the French 575km/h current collection conditions are simulated. Furthermore, review of the simulation results of the Korean 400km/h current collection conditions is conducted through comparison with that of the French 575km/h.

• 한국초전도ㆍ저온공학회논문지
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• 제22권2호
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• pp.32-37
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• 2020

Sam Dong Co., Ltd. has been succeeded in producing a 1 km multi-filament conductor in 2018. So far, we become more widespread to fabricate a variety of customized multi-filament wires such as 6 + '1' Cu, 18 + '1' Cu, and 36 + '1' Cu. In this work, we discuss the research progress on various MgB₂ wires over the past three years. We also provide a brief review for applications with our wires.

• E2M - 전기 전자와 첨단 소재
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• 제26권7호
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• pp.28-34
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• 2013

• 대한한의학회지
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• 제16권1호통권29호
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• pp.281-294
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• 1995

The effect of Sam Hwa San on the Na-K-ATPase activity was evaluated in microsomal fraction prepared from rabbit cerebral cortex to determine whether Sam Hwa San affects Na-K-ATPase activity of nervous system. Sam Hwa San markedly inhibited the Na-K-ATPase activity in a dose-dependent manner with an estimated $I_{50}$ of 0.12%. Optimal pH for the Na-K-ATPase activity was at 7.5 in the presence or absence of Sam Hwa San. The degree of inhibition by the drug more increased at acidic and alkalic pHs than neutral pH. Kinetic studies of substrate and cationic activation of the enzyme indicate classic noncompetitive inhibition fashion for ATP, Na and K, showing significant reduction in Vmax without a change in Km. Dithiothreitol, a sulfhydryl reducing reagent, partially protects the inhibition of Na-K-ATPase activity by Sam Hwa San. Combination of Sam Hwa San and ouabain showed higher inhibition than cumulative inhibition. These results suggest that Sam Hwa San inhibits Na-K-ATPase activity in central nervous system by reacting with, at least a part, sulfhydryl group and ouabain binding site of the enzyme protein, but with different binding site from those of ATP, Na and K.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집 특별세미나,특별/일반세션
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• pp.201-206
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• 2009

In the testing stage of HEMU-400X(next Korean high speed train) developing project, maximum speed(400km/h) tests will be conducted. On present and near future conditions of the overhead contact lines, 400km/h is over the design speed criteria. The predictions of current collection performance including the percentage loss of contact(arcs level) parameter through dynamic interaction simulation of HEMU-400X maximum speed test run are described in this paper. Various simulations are conducted at the condition of two different contact wire tensions to draw the proper contact wire increasing values in the 400km/h test line under the available contact wire tension supporting condition of that line.

• 전기학회논문지
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• 제63권12호
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• pp.1742-1746
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• 2014

In order to develop a overhead catenary system for the maximum speed of 400 km/h on Honam high-speed line, increasing tension of contact wire, changing dropper distributions, reducing a hard point and etc. should be considered. And it is also essential to develop core components taking account of the increased tension. Therefore we developed a new steady arm for the max. speed of 400 km/h in this study. FEM (Finite Elements Method) analysis was performed to ensure the strength of the arm. An oval shape was applied to the arm, so that 25 % of strength was increased and 9 % of weight was decreased. And a type test according to the code KRSA-3012 was performed to ensure the performance. Fatigue test in KRRI (Korea Railroad Research Institute)'s test-bed was also performed to evaluate its performance. Some section of the Honam High-speed line was constructed with the developed steady arm.

• 한국철도학회논문집
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• 제19권3호
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• pp.288-296
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• 2016

400km/h급 전차선로가 우리나라에 시범 부설되었다. 400km/h 심플 커티너리를 설계함에 있어서 사전이도를 어떻게 해야 하는가는 관심이 집중된 엔지니어링 항목이다. 사전이도는 일정 고속 대역에서 집전성능을 향상시키는 것으로 알려져 있다. 그러나 400km/h 속도에서 효과에 대해서는 아직 정립되어있지 않다. 400km/h 커티너리에서 적절한 사전이도량을 파악하기 위하여 사전이도 0과 1/3000 조건에서 전차선과 팬터그래프 사이 동적 성능 예측 시뮬레이션을 실시하였다. 이 예측에 근거하여 400km/h 전차선로 설계에서는 0 사전이도를 채택하였다. 그리고 400km/h 전차선로 시범구간(28km)을 건설하면서 일부구간에 1/3000 사전이도 구간(약 1km)을 조성하였다. HEMU-430X 열차를 투입하여 사전이도 조성 구간을 포함하여 시범구간에서 접촉력 측정을 실시하였다. 본 논문에서는 사전이도 조성 구간과 사전이도가 없는 구간의 동적 성능(접촉력)에 대하여 기술하며 그 둘을 비교한다. 결론적으로 400km/h 전차선로에서 사전이도를 주지 않은 구간이 1/3000 사전이도 구간보다 양호한 동적(집전) 성능을 나타냄을 해석적 및 실험적 검토를 통하여 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.932-939
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• 2011

This paper deal with technique of tension length calculation for 350km/h high speed catenary system. Tension length affects in facility investment. Possibility of overlap increasing a tension length and the equipment investor decreases in order to decrease. Considers the parameter which specifies and the grudge which is possible long the fact that decides a tension length is the aim which is important plans overhead contact line. The element which decides a tension length with next following; (i) Operating range of tension device, (ii) Change of the horizontal tension which affects possibility of the effect which operates to the line and span, (iii) Tension of wire material the tensile force which is relation, (iv) Wire thermal expantion which relates with a standard temperature, (v) Curve radius, (vi) Wind velocity, (vii) Thermal range of overhead contact wire and mechanical design of tension mechanism etc.