• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 추계학술대회 논문집
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• pp.591-594
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• 2002

Generating NC-code from 3D part model needs a lot of effort to make many decisions, including machining area, tool change data, tool data, cutting condition, etc., by using either manual or computer aided method. This effort can be reduced by integration of automated process planning and NC-code generation. In case of generating NC code with a help of the process planning system, many data mentioned from the process planning can be used. It means that we can create NC-code about a full part. In this study, integration of FAPPS(Feature based Automatic Process Planning) with a NC-code generating module is described and additional data to adapt NC-code for machine shop is discussed.

• 대한전기학회논문지
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• 제37권5호
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• pp.289-297
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• 1988

In this paper, the analysis of a generating torque characteristics of 2-phase induction motor driven with the phase control method is presented. The generating torque equations which represent average torque and pulsating torque are derived from the elementary machine model. The calculating equations which can get the values of average torque and pulsating torque is expressed by the parameters of the equivalent circuit of 2-phase induction motor. According to the calculating equations, these performance characteristics are investigated under various conditions. Finally, a strategy to eliminate non-linearity and pulsating torque generated in driving 2-phase induction motor with the phase control method is presented.

• Journal of Magnetics
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• 제21권3호
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• pp.399-404
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• 2016

This paper presents a new permanent magnet (PM) assisted topology for a recently introduced brushless wound rotor synchronous machine (BL-WRSM) [1]. The BL-WRSM had a dual-inverter configuration for generating a composite magneto motive force (MMF) with a fundamental component and a subharmonic component. The subharmonic component of the MMF is used for brushless excitation of the rotor. In this paper, additional PMs were introduced on the rotor of the BL-WRSM, making it a hybrid BL-WRSM. We also discussed the flux weakening operation for the hybrid BL-WRSM. The hybrid BL-WRSM offered advantages for starting the machine and provided better performance under full-load conditions. The finite element method (FEM) was used to analyze the performance of the hybrid BL-WRSM, and we compared its performance with BL-WRSM. Finally, prototypes were built with and without the PM-assistance, and experiments were conducted to demonstrate their performance.

• 한국공작기계학회논문집
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• 제12권3호
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• pp.75-81
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• 2003

Pocket machining is metal removal operation commonly used for creating depressions in machined parts. Numerically controlled milling is the primary means for machining complex die surface. These complex surfaces are generated by a milling cutter which removes material as it traces out pre-specified tool paths. To machine, a component on a CNC machine, part programs which define the cutting tool path are needed. This tool path is usually planned from CAD, and converted to a CAM machine input format. In this paper I proposed a new method for generating NC tool paths. This method generates automatically NC tool paths with dynamic elimination of machining errors in 2$\frac{1}{2}$ arbitrary shaped pockets. This paper generates a spiral-like tool path by dynamic computing optimal pocket of the pocket boundary contour based on the type and size of the milling cutter, the geometry of the pocket contour and surface finish tolerance requirements. This part programming system is PC based and simultaneously generates a G-code file.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 춘계학술대회 논문집
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• pp.563-567
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• 1996

This paper was undertaken to analyze the morphology of wear debris generating from moving lubricated machine surfaces by image processing. The lubricating wear test was carried out under different experimentaal conditions using the wear test device was made in our laboritory and wear testing specimen of the pin on disk type wear rubbed in paraffine series base oil, byvarying applied load, sliding distance. The four parameters(50% volumetric diameter, aspect, roundness and reflectivity) to describe the morphology have been developed and are outlined in the paper. A system using such techniques promises to obviate the need for subjective, human interpretation of particle morphology in machine condition monitoring, thus overcoming many of the difficulties with current methods and facilitating wider use of wear particle analysis in machine condition monitoring.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.367-372
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• 2000

Accuracy of a machined component is determined by the relative motion between the cutting tool and the workpiece. One of the important factors which affects the accuracy of this relative motion is the geometric error of machine tools. In this study, geometric error is modeled using form shaping motion of machine tool, where a form shaping function is derived from the homogeneous transformation matrix. Geometric errors are measured by laser interferometer. After that, the local positioning error can be estimated from the form shaping model and geometric error data base. From this information, we can remodel the part by shifting the design surface to the amount of positional error. By generating tool path to the redesigned surface, we can reduce the machining error.

• 대한전기학회논문지:전력기술부문A
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• 제48권3호
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• pp.304-312
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• 1999

In order to make industrial robots and CNC machine tools perform tasks efficiently, each axis has to be accelearated and decelerated appropriately. The existing techniques for the acceleration and deceleration of industrial robots and CNC machine tools are not efficient to generate velocity profiles. Thus, these previous techniques cannot generate velocity generating velocity profiles that cannot be generated by them. Based on the proposed approach, an acceleration and deceleration circuit for industrial robots and CNC machine tools is designed with a FPGA by using the VHDL.

• Journal of Magnetics
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• 제12권2호
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• pp.84-88
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• 2007

A micropump with spiral-type magnetic micromachine was fabricated. When a rotating magnetic field was applied, the machine rotated and pumped a surrounding liquid. We experimentally examined the basic properties of this pump. We found that the pressure and the flow rate could be controlled by the rotating frequency, and this pump could work under wide range kinematic viscosity. In addition, we proposed a disposable pump system using the machine. When a plate installed a fluid channel and the machine was set on a stage for generating a rotating magnetic field, the machine worked as the pump.

• 전력전자학회논문지
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• 제12권3호
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• pp.221-233
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• 2007

본 논문에서는 고성능 단축 선형전동기에 적용할 수 있는 최단시간 위치 패턴 알고리즘에 대하여 논한다. 근래 들어 LCD/PDP 및 반도체 산업이 발달함에 따라 대형의 고성능 위치제어 시스템에 대한 요구가 높아지고 있으며 이러한 시스템에서는 공정 주기의 단축을 위하여 시간요소를 최소화시킨 최적 위치 패턴이 반드시 필요하다. 특히 반도체 산업 분야에서는 공작기계 분야와 달리 3차원 입체 위치 패턴보다는 단축 패턴에 대한 수요가 비교적 많은 편이다. 본 연구에서는 가속도가 사다리형인 위치 패턴을 기본으로 하여 연구를 진행하였으며 위치 및 시간을 변수로 고려한 패턴 분석을 통하여 최단시간에 목적하는 위치에 도달하기 위한 패턴을 비교적 간단히 구현할 수 있음을 보이고 이를 시뮬레이션 및 간이 실험으로 구현 가능성을 입증하였다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2022년도 춘계학술대회
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• pp.235-237
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• 2022

영상 콘텐츠는, 길이에 따라 롱폼 영상 콘텐츠와 숏폼 영상 콘텐츠로 구분된다. 롱폼 영상 콘텐츠는 15분 이상 길이로 생성되며, 편집 없이 촬영 영상의 모든 프레임들이 포함되도록 한다. 숏폼 영상 콘텐츠는 1분이상 15분 이내로, 촬영 영상의 프레임들로부터 일부 프레임만 짧은 길이로 편집할 수 있다. 최근 1인 방송 시장의 성장으로 인하여, 시청자들을 늘리기 위한 숏폼 영상 콘텐츠에 대한 수요가 확대되고 있다. 따라서, 숏폼 영상 콘텐츠를 편집하여 생성하는 콘텐츠 편집 기술에 대한 연구가 필요하다. 본 연구는 영상, 음성, 동작을 포착하여 주요 장면의 숏폼 동영상을 생성하는 기술을 연구한다. 주요 장면의 숏폼 동영상은 머신 러닝을 통해 미리 학습된 하이라이트 추출 모델을 이용한다. 하이라이트 영상을 자동으로 생성하는 영상 자동 편집 시스템 및 방법은 숏폼 영상 콘텐츠의 핵심 기술이다. 머신러닝 기반의 영상 자동 편집 방법 및 시스템 연구는 1인 크리에이터들의 영상 편집에 투입되는 노력과 비용시간을 감소시켜, 경쟁력있는 콘텐츠 활동을 할 수 있도록 기여할 것이다.