• 정보보호학회논문지
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• 제26권3호
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• pp.603-608
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• 2016

인코딩은 정보의 형태나 형식을 표준화, 보안, 처리 속도 향상, 저장 공간 절약 등을 위해 다른 형태나 형식으로 변환 또는 처리 하는 것을 말한다. 정보 통신에서 송신자의 정보가 다른 형태로 수신자에게 전달할 수 있도록 정보를 변환하는 것도 인코딩이다. 이 처리를 수행 하는 장치를 인코더라 부른다. 본 논문에서는 양자 컴퓨터에서 요구되는 인코더 중 가장 기본적인 4-to-2 인코더를 제안한다. 제안한 인코더는 2개의 OR 게이트를 사용하여 구성된다. 제안한 구조는 셀의 간격을 최적화 하고 배선간의 잡음을 최소화하는 것을 목적으로 설계한다. 제안된 인코더를 QCADesigner를 통해 시뮬레이션을 수행하고, 그 결과를 분석하여 효율성을 확인한다.

• 한국정보통신학회논문지
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• 제8권7호
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• pp.1506-1511
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• 2004

디지털 통신망을 통한 정보 송수신시 전송로 상에서의 잡음으로 인해 데이터 블록에 발생하는 오류는 전체 통신 시스템의 성능 및 전송효율에 지대한 영향을 미친다. 설계된 RS 코드 복호기는 오류 위치 다항식과 오류평가 다항식을 구하기 위해 수정된 유클리드 알고리즘을 적용하였다. 본 논문에서 적용된 설계 구조와 알고리즘 계산 방식은 복호기 설계시 1개의 셀을 사용하여 면적을 최소화하고, 연산을 ROM과 병렬 구조로 구성하였기 때문에 높은 동작주파수에서 고속 동작을 실현 할 수 있을 것이라 기대된다. 본 논문에서 설계된 회로는 ModelSim과 Active-HDL 그리고 Synopsys Tool상에서 설계되었으며, Xilinx Virtex2 XC2V3000에 PNR시 slice 점유율은 28% 시스템 클럭 스피드는 45Mhz의 결과를 얻었다.

• 전기학회논문지
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• 제65권5호
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• pp.831-835
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• 2016

In this paper, a dual-channel feed-forward transimpedance(TIA) array is realized in a standard $0.18-{\mu}m$ CMOS technology which exploits automatic gain control function to provide 40-dB input dynamic range for either detecting targets nearby or sensing imminent danger situations. Compared to the previously reported conventional feed-forward TIA, the proposed automatic-gain-control feed-forward TIA(AFF-TIA) extends the input dynamic range 25 dB wider by employing a 4-level automatic gain control circuit. Measured results demonstrate the linearly varying transimpedance gain of 47 to $72dB{\Omega}$, input dynamic range of 1:100, the bandwidth of $${\geq_-}670MHz$$, the equivalent input referred noise current spectral density of 6.9 pA/${\surd}$HZ, the maximum sensitivity of -26.8 dBm for $10^{-12}BER$, and the power consumption of 27.6 mW from a single 1.8-V supply. The dual-channel chip occupies the area of $1.0{\times}0.73mm^2$ including I/O pads.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2016년도 춘계학술대회
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• pp.691-692
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• 2016

본 논문은 802.11a 무선 랜용 5.25-GHz BiCMOS 저 잡음 증폭기를 제안한다. 이러한 회로는 1볼트 전원에서 동작하며, 저 전압 전원 공급에서도 높은 전압 이득을 가지도록 설계하였다. 제안한 회로는 $0.18{\mu}m$ SiGe HBT BiCMOS로 설계되어 있다. 저 전압 및 저 전력 동작을 위해 바이어스 회로는 밴드 갭 참조 (band-gap reference circuit) 바이어스 회로를 사용하였다. 제안한 회로는 최근 발표된 연구결과에 비해 높은 전압이득, 낮은 잡음지수 및 작은 칩 크기 특성을 보였다.

• 전력전자학회논문지
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• 제21권1호
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• pp.58-64
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• 2016

This study presents a design method for a single-loop voltage controller that is suitable for an arbitrary waveform generator (AWG). The voltage control algorithm of AWG should ensure high dynamic performance and should attain sufficient robustness to disturbances such as inverter nonlinearity, sensor noise, and load current. By analyzing the power circuit of AWG, control limitation and control target are presented to improve the dynamic performance of AWG. The proposed voltage control algorithm is composed of a single-loop output voltage control, an inverter current feedback term to improve transient response, and a load current feedforward term to prevent voltage distortion. The guideline for setting control gain is presented based on output filter parameters and digital time delay. The performance of the proposed algorithm is proven by experimental results through comparison with the conventional algorithm.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 B
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• pp.1260-1263
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• 2000

Vector control of a single phase induction machine(SPIM) is usually employed by mechanical methods than electrical ones. The disadvantage of a SPIM has large noise at the starting. Using auxiliary winding which is only utilized for starting, the SPIM can be controlled with the vector control method. Regarding a auxiliary winding one phase, the SPIM is analyzed by the unsymmetrical two phase motor and phase transformation is unnecessary such as three phase IM. Including a auxiliary winding, SPIM is modeled by mathematical getting by component of turns ratio with main to auxiliary winding. It will be take with complicated resultant formula, by comparison to symmetrical three phase TM. For using the vector control theory, it must be decoupled of rotor flux and torque component. stator current is controlled and decoupled. This paper presents a variable-speed control system of SPIM, which to decoupled with flux and torque component and to use machine equivalent circuit referred to rotor, conventionally three phase IM by similar method.

• Smart Structures and Systems
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• 제12권5호
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• pp.523-545
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• 2013

Piezoelectric and dielectric behaviors of a piezoceramic patch adhesively centered on a carbon composite plate are identified using a robust multi-objective optimization procedure. For this purpose, the patch piezoelectric stress coupling and blocked dielectric constants are automatically evaluated for a wide frequency range and for the different identifiable behaviors. Latters' symmetry conditions are coded in the design plans serving for response surface methodology-based sensitivity analysis and meta-modeling. The identified constants result from the measured and computed open-circuit frequencies deviations minimization by a genetic algorithm that uses meta-model estimated frequencies. Present investigations show that the bonded piezoceramic patch has effective three-dimensional (3D) orthotropic piezoelectric and dielectric behaviors. Besides, the sensitivity analysis indicates that four constants, from eight, dominate the 3D orthotropic behavior, and that the analyses can be reduced to the electromechanically coupled modes only; therefore, in this case, and if only the dominated parameters are optimized while the others keep their nominal values, the resulting piezoelectric and dielectric behaviors are found to be transverse-isotropic. These results can help designing piezoceramics smart composites for various applications like noise, vibration, shape, and health control.

• Journal of Magnetics
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• 제15권4호
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• pp.194-198
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• 2010

In our present work, we developed a GMI (giant magnetoimpedance) sensor system to detect magnetic fields in the milli gauss range based on the asymmetric magnetoimpedance (AGMI) effect in Co-based amorphous ribbon with self bias field produced by field-annealing in open air. The system comprises magnetoimpedance sensor probe, signal conditioning circuits, A/D converter, USB controller, notebook computer, and program for measurement and display. Sensor probe was constructed by wire-bonding the cobalt based amorphous ribbon with dimensions $10\;mm\;{\times}\;1\;mm\;{\times}\;20\;{\mu}m$ on a printed circuit board. Negative feedback was used to remove the hysteresis and temperature dependence and to increase the linearity of the system. Sensitivity of the milli gauss meter was 0.3 V/Oe and the magnetic field resolution and environmental noise level were less than 0.01 Oe and 2 mOe, respectively, in an unshielded room.

• 한국통신학회논문지
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• 제25권9B호
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• pp.1635-1640
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• 2000

본 논문에서는 기본파를 억제시키고 2차 고조파가 주 발진신호로 동작되는 18GHz 대역의 push-push 발진기를 semi-MMIC 형태로 설계 및 제작하였다. 마이크로스트립 선로를 포함하는 passive component는 semi-insulating GaAs 기판위에 MMIC 공정을 이용하여 구현하고, Chip 형태의 P-HEMT, 저항, 캐패시터를 Au wire-bonding에의해 연결하였으며, via-hole 대신 접지면을 회로 주변에 구성하여, back-side와 wire-bonding하였다. 실험 결과 -10.5 dBm의 출력 전력 특성을 얻었으며, 기본 주파수 억압은 -17.3 dBc/Hz의 특성을 보였다. 위상 잡음은 100kHz offset에서 -97.7 dBc/Hz를 얻었다.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권3호
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• pp.131-137
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• 2000

2 phase 8 pole HB-type(flat-type) Linear Pulse Motor can be used as the high precision position actuator because of its many advantages (simple control circuit, high stiffness characteristics, etc). Also, using the microstep drive, its noise and vibration can be reduced considerably and positional resolution may be increased further. But, $20^{\circ}$tapered tooth shape to reduce the normal force have an much effect on the static thrust force characteristics. And, because of hybrid-type LPM, interaction between the permanent magnet and the excitation current have an effect on the various characteristics of LPM. Hence, in this paper, the effect of tooth shape on static thrust force characteristics was analyzed using the air gap permeance by finite element method. For analyzing the effect of unbalance between the m.m.f of permanent magnet and the m.m.f of excitation current, unbalanced m.m.f coefficient $\sigma$ were introduced with the permenace matrix and switching matrix.