• 한국지능시스템학회논문지
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• 제20권2호
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• pp.214-219
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• 2010

본 논문은 리튬폴리머 배터리의 잔존충전용량 추정을 위한 비선형 퍼지 $H_{\infty}$ 필터의 설계 방법을 제시한다. 배터리 셀의 동적방정식을 T-S 퍼지시스템으로 모델하고 선형행렬 부등식의 해를 이용하여 퍼지필터를 설계한다. 제시한 퍼지 $H_{\infty}$ 필터의 성능을 입증하기 위하여 UDDS 전류 프로파일을 사용한 실험 데이터를 이용하여 모의실험을 수행하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
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• pp.781-784
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• 2003

In this paper, high density on-board dc/dc converter using multi-layer PCB is proposed. Recently, the communication system wants power supply of open-frame, high density and low profile. So experimental converter was consisted of 3.3V/30A Quarter Brick size DC/DC Converter. To power height limit, coil of transformer, choke and circuits were consisted of multi layer PCB. Besides to improve of efficiency, made secondary synchronous rectifier Mosfet driving circuit. So total efficiency could be improved.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.138-140
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• 1994

The torque production of SRM is dependent on the variation of inductance which is related to rotor position angle. So the realization of high efficiency SRM is achieved by design of optimal inductance profile appropriate for magnetic capacity of motor. This can be obtained by optimal design of winding number of stator. This paper suggests the design standard of winding number of stator for high efficiency. And this paper shows the experimental results of driving performance of SRM.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 1996년도 특별강연 및 추계학술발표 개요집
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• pp.148-152
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• 1996

A transient two-dimensional (2D) model was developed for investigating the heat and fluid flow in old pools and determining velocity profile and temperature distribution for the Gas Metal Arc (GMA) welding process. The mathematical formulation deals with the driving farces (electromagnetic, buoyancy, surface tension and plasma drag forces) as well as energy exchange between the molten filler metal droplet and weld pools. A general thermofluid-mechanics computer program, PHOENICS, was employed to numerically solve the governing equation with the associated source terms. The results of computation have shown that the electromagnetic and surface tension farces as will as the molten filler metal droplet have major influence in shaping the weld pool geometry.

• 한국결정성장학회지
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• 제9권5호
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• pp.454-458
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• 1999

Hydrodynamic Thermal Capilary Model developed previously has been modified to study the transport phenomena in the Czochralski process. Our analysis is focused on the heat transfer in the system, convection in the melt phase, and the meniscus and interface shape. Four major forces drive melt flow in the crucible, which include thermal buoyancy force in the melt, thermocapillary force along the curved meniscus, crucible rotation and crystal rotation. Individual flow mechanism due to each driving force has been examined to determine its interaction with the meniscus and interface shape. A nominal 4-inch-diameter silicon crystal growth process is chosen as a subject for analysis. Heater temperature profile for constant diameter crystal is also present as a function of crystal height or fraction solidified.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.2461-2463
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• 2000

This paper presents a scheme for designing a fuzzy observer for servo control system with nonlinear element, i.e., backlash. It is found that backlash occurs when the feed direction is reversed. Due to the imperfect transient response of the driving mechanism, not only the static backlash error but also the dynamic backlash error is generated on the contouring profile. And also, we utilized two inertia modeling in order to deals with coupled system accurately. The overall control system consists of two parts - a servo controller and an Fuzzy obsever. It is a Takagi-sugeno type fuzzy model whose consequent part is of the state space form is obtained. A simulation is carried out to demonstrate the effectiveness of the proposed scheme.

• Journal of Electrical Engineering and Technology
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• 제12권3호
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• pp.1257-1261
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• 2017

This paper focuses on understanding the interrupting capability of an arc contact system in a molded case circuit breaker (hereafter MCCB). We selected four types of MCCBs and analyzed the magnetic flux density distributions in the contact systems caused by the fault currents. We ascertained that the magnetic flux density profile varies according to the shape of the contact system and was asymmetric at both the ends of an arc, perpendicular to the arc column because of the magnetic grid installed in the contact system. The asymmetric difference creates a magnetic force that pushes the arc current outwards and provides an interrupting capability. We have introduced a simple analysis method for determining the interrupting capability of the contact system for an MCCB by the arc-driving magnetic flux density.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 전력전자학술대회 논문집
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• pp.1-4
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• 2001

SRM(Switched Reluctance Motor) uses reluctance torque by pulse excitation control. SRM drives are much studied in electrical vehicles and industrial application due to the simple, robust mechanical structure and high speed characteristics. For the high performance control of SRM, it is necessary to synchronize the stator phase excitation with the rotor position. This paper proposes a new encoder for high performance excitation control of SRM. The proposed encoder has complex structures of incremental and absolute encoder. An each phase inductance profile can be synchronized with 4-bit absolute position signal and incremental pulses are used for speed detection. Low cost and simple manufacturing of SRM encoder is possible.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2020년도 전력전자학술대회
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• pp.379-380
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• 2020

배터리의 효율적인 관리와 안정적인 운영을 위해서는 배터리의 노화에 따른 배터리의 모니터링이 중요하다. 그 중에서도 노화에 대한 문제는 실제 어플리케이션에서 매우 중요하기 때문에 더 정확하고 안정적인 운영을 위해서는 배터리 잔존 수명을 판단하는 지표인 State of Health (SOH)가 필수적이다. 따라서 실험을 통한 UDDS의 전압 차 (Voltage Difference) 이미지를 학습데이터로 구성하여, SOH의 파라미터인 용량을 추정하는 Convolutional Neural Network(CNN) 모델을 제안한다.

• 한국정보통신학회논문지
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• 제19권11호
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• pp.2689-2696
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• 2015

방사선 진단에 사용되는 방사성동위원소 중 사이클로트론을 이용해 생산되는 방사성동위원소는 사이클로트론에서 인출된 양성자 빔이 타겟에 조사될 때 빔의 크기와 모양, 조사되는 위치에서 빔 균일 정도에 따라 생산 수율에 영향을 받는다. 이에 본 논문에서는 사이클로트론 빔 라인에서 빔의 단면을 측정할 수 있는 BPM(Beam Profile Monitor)장치를 개발하였다. LabView로 BPM장치를 원격 제어할 수 있도록 구성하였으며 BPM 프로그램을 이용하여 X축과 Y축으로 텅스텐 와이어를 스캔하면서 얻은 빔의 수치 정보를 2차원 그래프와 3차원 빔 분포 그래프로 표시하여 해석을 쉽게 모니터링 할 수 있도록 하였다. 빔을 측정하는 데 걸리는 시간은 스텝 모터 구동 속도가 2000pps일 때 37초가 걸린다는 것을 확인 할 수 있었다. 측정된 빔 분포정보를 기반으로 빔 재조정을 통해 빔 분포를 최적화함으로써 방사성동위원소 생산 수율을 극대화 시킬 수 있고 공급 안정화에도 기여하리라 본다.