• 제어로봇시스템학회논문지
• /
• 제5권8호
• /
• pp.941-947
• /
• 1999

As pressure transducers are employed in many fields such as production facilities, test facilities vehicles and industrial machinery, there is an increasing need for high precision measurement of pressure without any calibration or maintenance. In this paper, we discuss the development of a smart thin film pressure transducer which is highly suitable for a precise measurement of pressure. The smart functions include automatic zero tracking, automatic span adjustment, temperature compenstion, continuous self-diagnostics for faults (open strain gages, abnormal data, incorrect A/D conversion, and overpressure), data memory and multi-drop communication with PC

• 한국컴퓨터정보학회논문지
• /
• 제7권4호
• /
• pp.121-126
• /
• 2002

3차원 영상은 2차원 영상과 달리 사물을 직접 볼 때처럼 입체감을 느낄 수 있으며 영상을 통해 바라보는 공간과 자신의 공간 연결이 더 자연스러워지므로 시각정보에 큰 영향을 주고 있다. 2차원 영상을 3차원으로 변환하기 위하여 몇 가지 방법이 제시되고 있다. 본 논문에서는 3차원 영상을 변환하기 위하여 2차원 단일 영상을 사용하지 알고 계속적으로 입력되는 다중 영상을 MPEG의 움직임 벡터를 적용한 공간적 분석 알고리즘을 제안한 결과 실험대상으로부터 3차원 효과를 확인하였다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2001년도 ICCAS
• /
• pp.97.2-97
• /
• 2001

This work is concerned with the improvement of the productivity and the product quality in the polymerization reactors by using model-on-demand predictive control(MoDPC). This technique is applied to a continuous styrene polymerization reactor and a semibatch methyl methacrylate (MMA)/vinyl acetate(VAc) copolymerization reactor. The regress is constructed with the most influential variables the conversion and the jacket inlet temperature for the styrene polymerization reactor, and the free volume and the reactor temperature for the MMA/VAc copolymerization reactor through open loop operations. From the simulation results for setpoint tracking and disturbance rejection problems, it is demonstrated that the MoDPC shows ...

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2003년도 추계종합학술대회
• /
• pp.66-70
• /
• 2003

본 논문에서는 쇼트키 장벽 빔 리드 다이오드와 180$^{\circ}$ hybrid coupler를 이용하여 24.10GHz 대역에서 동작하는 단일 평형 주파수 혼합기를 설계 및 제작하였다. 제작된 혼합기는 변환손실이 6 [dB], RF/LO 격리도가 [23]dB, P1dB(in)는 5 [dBm]의 결과를 얻었다. 본 논문에서 제작한 혼합기는 근거리 표적 탐지용 homedyne 레이더에 이용가능 할 것이다.

• Journal of Power Electronics
• /
• 제18권3호
• /
• pp.651-661
• /
• 2018

This paper suggests a new non-isolated high voltage gain DC-DC converter with two switches. The proposed two-switch converter has the following characteristics: a high voltage gain, a continuous input current with a small ripple, a reduction in the size of the inductor, and a simple circuit with only a few elements. A theoretical analysis, guidelines for parameter selection, and a comparison with conventional non-isolated high step-up converters are presented. A prototype of 250 W is set up to demonstrate the correctness of the proposed converter. Results obtained from simulations and experiments are presented.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제5B권4호
• /
• pp.392-398
• /
• 2005

This paper presents technologies that have strategic importance in future motor drives. The underlying strategic issue for motor drives is maintaining cost while increasing certain dimensions of functionality. The dimensions of functionality which should increase include reliability and added value features such as providing continuous energy optimization, providing sensing of the driven system suitable for application specific diagnostic purposes, and providing continuously optimal thermal utilization of the capability of the drive. This paper will address each of these issues and discuss the technology status for each case, with a focus on research needed to fully deliver the needed functionality.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• 제5B권4호
• /
• pp.324-330
• /
• 2005

The complex sensorless control scheme is not practical for use in the field of home appliance systems because it is not economical. Therefore, it is necessary to introduce a simplified sensorless control scheme that is composed of least calculation to estimate the rotor position. This paper presents the principle of the rotor position estimation with comparison of the estimated flux linkage and reference flux linkage. In order to verify the feasibility of the control scheme, ACSL is used for the simulation and TI DSP TMS320F240 is used for the experiment.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
• /
• pp.155-158
• /
• 2004

We propose a dynamic wavelength assignment algorithm for online RWA problem in WDM networks with wavelength conversion. With our algorithm, for a given network condition, the following results have been proven mathematically: (1) the probability to find the set of wavelengths for a requested connection is equal or better than any other previously proposed algorithms, (2) our algorithm minimizes the usage of converters by chaining the minimum number of the longest wavelength continuous segments, leaving more converters available for future requests and (3) the complexity of our algorithm is reasonable, which is also another advantage of our algorithm.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2001년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.343-345
• /
• 2001

새로운 대체 에너지원으로 주목받고 있는 풍력 에너지의 효율적인 이용을 위하여 기개발되어 운용중인 30kW급 수직-수평축 통합형 풍력발전시스템을 대상으로 낙도 지역 등에서 사용할 수 있는 독립형 전원장치를 설계하였다. 설계된 시스템은 무보수 밀패형 배터리와 자체 개발한 배터리 충전 제어 장치 및 교류 전원 출력용 인버터로 구성되며 장시간 바람이 불지 않는 경우에도 양질의 전원을 연속적으로 부하에 공급할 수 있도록 설계되었다.

• Journal of Power Electronics
• /
• 제14권4호
• /
• pp.621-631
• /
• 2014

To invigorate the tapped-inductor boost (TIB) topology in emerging high step-up applications for off-grid products, a lossless snubber consisting of two capacitors and three diodes is proposed. Since the switch voltage stress is minimized in the proposed circuit, it is allowed to use a device with a lower cost, higher efficiency, and higher availability. Moreover, since the leakage inductance is fully utilized, no effort to minimize it is required. This allows for a highly productive and cost-effective design of the tapped-inductor. The proposed circuit also shows a high step-up ratio and provides relaxation of the switching loss and diode reverse-recovery. In this paper, the operation is analyzed in detail, the steady-state equation is derived, and the design considerations are discussed. Some experimental results are provided to confirm the validity of the proposed circuit.