• Title/Summary/Keyword: operation principle

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Operation Fee and Insurance Charge of Hallux Valgus Surgery (무지 외반증의 수술비 및 보험)

  • Song, Ha-Heon;Shim, Dae-Moo;Kim, Dong-Churl;Kweon, Seok-Hyun;Kim, Jong-Yun
    • Journal of Korean Foot and Ankle Society
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    • v.10 no.2
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    • pp.238-241
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    • 2006
  • Purpose: The purpose of this study was to figure out the appropriate and systemic insurance charge for the hallux valgus operations. Materials and Methods: 5 Hospitals for hallux valgus operations were analyzed how they have been charging the national health insurance corporation for their operation fees and how to use the estimated guide and authoritive interpretation through the guide book of health insurance medical treatment grant expense and the guide book of Health insurance medical treatment. Results: There are nothing for guiding principle of hallux valgus operations in both books but a guide of Mcbride operation which is approved 'JA-93-KA and JA-31' for operation fee. So majority of hospitals have charged operation fee depending on their own interpretations they like. According to the guide books, there was a authoritive interpretation that simultaneous operation of osteotomy and tendon transfer for cerebral palsy and flat foot can be eatimated as 'osteotomy+JA-93-NA'. Conclusion: Distal soft tissue procedure should be approved as 'JA-93-NAx100%+JA-31x50%' according to the the estimated guide and authoritive interpretation if transected adductor hllucis is transfered to first metatarsal head. So distal chevron osteotomy could be 'JA-30-1-RAx100%+JA-31x50%', proximal metatarsal osteotomy could be 'JA- 93-NAx100%+JA-31-50%+JA-30-1-RAx50%', first metatarsocuneiform joint arthrodesis could be 'JA-93-NAx100%+ JA-31x50%+JA-73-RAx50%'.

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Improved Efficiency Methodology of 100kW-Energy Storage System with Wide-Voltage Range for DC Distribution (직류배전을 위한 넓은 전압범위를 가지는 100kW급 에너지저장장치의 고효율화 방안연구)

  • Byen, Byeng-Joo;Jeong, Byong-Hwan;Kim, Jea-Han;Choe, Gyu-Ha
    • The Transactions of the Korean Institute of Power Electronics
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    • v.22 no.1
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    • pp.44-52
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    • 2017
  • This paper describes a 100 kW high-efficiency isolated DC-DC converter for DC distribution system. The DC-DC converter consists of two dual-active-bridge (DAB) converters in parallel. The operating principle of the DAB converter is explained, and the algorithm for parallel operation of the DAB converters is proposed. Simulation and experiments are conducted to verify the performance of the proposed system. Experimental results demonstrate that the developed converter excellently marks 97.4 percent of peak efficiency under its normal operating condition.

Cold electronics based 128 temperature sensor interface with 14 leads for testing of high Tc superconducting cable

  • Gour, Abhay Singh;Thadela, S.;Rao, V.V.
    • Progress in Superconductivity and Cryogenics
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    • v.20 no.1
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    • pp.11-14
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    • 2018
  • High Temperature Superconducting (HTS) power cables are capable of transmitting bulk power without any loss compared to conventional copper cables. The major challenge in the design of such HTS cables is the high stresses (electro-thermal/electro-mechanical) developed at high voltages, high currents and cryogenic temperatures. The safe and reliable operation of HTS cables involves lots of instrumentation for monitoring, measurement, control and safe operation. In principle, a four probe method for resistance (RTD PT-100) is used for temperature measurements at various locations of HTS cable. The number of connecting leads required for this is four times that of the number of sensors. The present paper discusses a novel way of connecting 128 RTD sensors with the help of only 14 leads using a cold electronics based multiplexer board. LabVIEW 11.0 software was used for interfacing and displaying the readings of all the sensors on computer screen.

A Study of Development and Product ion Technology for Camcoder Iris Assembly (캠코더용 Iris Assembly의 국산화 및 생산 기술 개발 사례)

  • Ko, Jong-Sun
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.250-252
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    • 1996
  • In this paper, the principle of operation. the part characteristic, characteristic of component movement, analysis are carried out for camcoder iris assembly which is one of the important element component in Video large projection TV instrument, and some Know-how for development of element component is also included. The magnetic field circuit for the small and simple structure with low power consumption is introduced and new materials of yoke for small motor system is suggested. Especially, the relation with remained magnetic field and operation duration time is analyzed by experimental results. Some problems of nonlinear torque characteristics include to obtain the simple and low cost structure in domestic production of element component is analyzed. Furthermore, development procedure is suggested for iris assembly and some methods to reduce the burr with some check points for small precise accessories are explained.

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Computerized Railway Alignment Evaluation and Construction Quantity Estimation (궤도선형 계산 및 수량 산출 프로그램 개발)

  • Jee Sang Bok;Lee Tai Sik;Lee Dong Wook
    • Journal of the Korean Society for Railway
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    • v.8 no.4
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    • pp.379-384
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    • 2005
  • To maintain the stability during the operation of railway vehicle, the perfect installation of rail, namely the orbit as well as the performance of the railway vehicle itself is required. The orbit of railway needs the intensity and elasticity that stands the shock and vibration due to the weight of the railway vehicle enough, Also, the driving safety during the operation of vehicle should be guaranteed, comfortable feeling of the passenger should be maintained, and the influence of the noise and vibration to the environs should be minimized. Therefore, it is necessary to develop a program that calculates the change of construction cost according to the selection of railway orbit. This study introduces the orbit design automation program according to the selection of railway orbit, and discuss the principle and the way to use of the program.

Boost-Half Bridge Single Power Stage Configured PWM DC-DC Converter for Residential PEFC Stack Interface.

  • Khairy, Fathy;Choi, Kwang-Ju;Lee, Hyun-Woo;Mutsuo, Nakaoka
    • Proceedings of the KIEE Conference
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    • 2006.10d
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    • pp.132-134
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    • 2006
  • This paper presents the design and implementation of 1 kW prototype DC-DC power converter with bridge voltage-doubler suitable for small scale PEM fuel cell system and its associated control scheme. The operation principle of this converter is described using some operating waveforms and the switching mode equivalent circuits based on simulation results and a detailed circuit operation analysis and soft-switching conditions.

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Asymmetrical Half-bridge Flyback Converter with Universal Input Voltage Range (넓은 입력전압 범위에서 동작하는 비대칭 하프브리지 방식의 플라이백 컨버터)

  • Yoo, Doo-Hee;Lee, Jae-Min;Jeong, Gang-Youl
    • Proceedings of the KIPE Conference
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    • 2007.11a
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    • pp.124-126
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    • 2007
  • This paper presents an asymmetrical half-bridge flyback converter with universal input voltage range. The leakage inductance and output capacitance of active switches are used to realize zero voltage switching(ZVS) operation during the transition state between two switches. In this paper, the operating principle and system analysis of the adopted converter are discussed in detail. A 5V/20A prototype has been implemented to verify the proposed topology and theoretical operation under various load condition and universal input voltage range.

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Effect on Molded Case Circuit Breaker of Harmonic Current (고조파 전류가 배선용차단기에 미치는 영향)

  • Yoo, Jae-Geun;Choi, Myung-Il;Park, Chee-Hyun;Son, Jae-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.1
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    • pp.53-58
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    • 2008
  • This paper analyze the operating characteristic of MCCB due to the synthesize harmonic current. Four types of MCCBs, divided by the type of operation system and a principle of operation, tested with 200[%] of rated current. The test result nuisance tripping did not occur but the time delay characteristic of the hydraulic magnetic type MCCB is appeared. From the place where the synthesize harmonic content is high it is good the hydraulic magnetic type MCCB not to use.

Flywheel Energy Storage UPS with Voltage Compensation (플라이휠 저장 에너지를 이용한 무순단 전압보상 기능을 갖는 UPS)

  • Lee K .S.;Kim J. W.;Byeon W. Y.;Nho E. C.;Kim I. D.;Chun T. W.;Kim H. G.
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.592-596
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    • 2004
  • This paper deals with the operation of a flywheel energy storage UPS. The ups has good features such as long life-time, improved efficiency, no environment problems, reduced size and space, and low maintenance cost compared with the conventional UPS using battery. The operating principle of the UPS is analysed in each mode including charging, voltage compensation, discharging, and voltage unbalance compensation. Especially, the tracking characteristic of the disturbed phase of the source voltage after outage is analysed. The usefulness of the operation is proved through simulations.

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A New Active Clamp Forward Converter Using Secondary Inductor Current Ripple for Improved ZVS Operation

  • Lee Sung-Sae;Han Sang-Kyoo;Moo Gun-Woo
    • Proceedings of the KIPE Conference
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    • 2004.07b
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    • pp.615-619
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    • 2004
  • A new asymmetrical zero voltage switching (ZVS) active clamp forward converter is proposed. Since the ripple current of secondary inductor plays a key role in the ZVS operation of main power switch, the proposed converter shows an excellent ZVS performance. The synchronous rectification is employed to reduce the rectification loss. The operational principle and ZVS analysis are presented. Experimental results demonstrate that the proposed converter can achieve an excellent ZVS performance throughout all load conditions and the significant improvement in the efficiency for the 100W(5V,20A) prototype converter.

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