• 한국자동차공학회논문집
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• 제13권6호
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• pp.38-47
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• 2005

In this paper, a regenerative braking algorithm is proposed to make the maximum use of the regenerative braking energy for an independent front and rear motor drive parallel HEV. In the regenerative braking algorithm, the regenerative torque is determined by considering the motor capacity, motor efficiency, battery SOC, gear ratio, clutch state, engine speed and vehicle velocity. To implement the regenerative braking algorithm, HEV powertrain models including the internal combustion engine, electric motor, battery, manual transmission and the regenerative braking system are developed using MATLAB, and the regenerative braking performance is investigated by the simulator. Simulation results show that the proposed regenerative braking algorithm contributes to increasing the battery SOC, which recuperates 60 percent of the total braking energy while satisfying the design specification of the control logic. In addition, a control algorithm which limits the regenerative braking is suggested by considering the battery power capacity and dynamic response characteristics of the hydraulic control module.

• 한국재료학회지
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• 제12권2호
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• pp.146-152
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• 2002

Effect of polyaniline and additives on surface appearance of Zn electrodeposition was investigated by SEM and XRD analyzing. We carried out the experiment from sulfate Zinc bath containing sulfonated polyaniline, gelatin and thiourea by EG(Electrogalvanizing) simulator. Addition of polyaniline and gelatin in bath, crystal size and shape of hexagonal plane of Zn crystal reduced. Mixing of thiourea, however, brittle deposits were observed because of the difference between vertical growth and parallel growth. (1011) peak appeared with polyaniline and gelatin in XRD analysis. In case of mixing of polyaniline, gelatin and thiourea, (1011) peak appeared and intensity of Zn basal plane decreased. These results suggested that overpotential increased with addition of polyaniline and additives In bath.

• Transactions on Control, Automation and Systems Engineering
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• 제3권2호
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• pp.117-123
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• 2001

To improve control performance of a non-linear system, many other reserches have used the sliding model control algorithm. The sliding mode controller is known to be robust against nonlinear and unmodeled dynamic terms. However, this algorithm raises the inherent chattering caused by excessive switching inputs around the sliding surface. Therefore, in order to solve the chattering problem and improve control performance, this study has developed the sliding mode controller with a perturbation estimator using the observer-based fuzzy adaptive network. The perturbation estimator based on the fuzzy adaptive network generates the control input of compensating unmodeled dynamics terms and disturbance. And the weighting parameters of the fuzzy adaptive network are updated on-line by adaptive law in order to force the estimation errors converge to zero. Therefore, the combination of sliding mode control and fuzzy adaptive network gives rise to the robust and intelligent routine. For evaluation control performance of the proposed approach, tracking control simulation is carried is carried out for the hydraulic motion simulator which is a 6-degree of freedom parallel manipulator.

• 대한인간공학회지
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• 제28권2호
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• pp.9-16
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• 2009

The aim of this study was to evaluate the effects of the driving performance and workload according to changing driving environment and types of steering wheel. Twelve drivers who participated in this study consisted of two groups; six Japanese as the left-lane drivers who was accustomed to driving on left-hand side of the road, and six Europeans, Americans, and Korean as the right-lane drivers who was accustomed to driving on right-hand side of the road. They were asked to operate a driving simulator while using two different types of steering wheel (for the left-hand side driving and the right-hand side driving). During the experiment, a range of data were measured including driving performance, mental workload, and eye movements which were recorded in order to identify the amount of time looking towards the in-vehicle route guidance. Results indicated that the use of the steering wheel by parallel moving led to increase high attentional demand and worse glance behavior to traffic signs for the left-lane drivers. In the case of the right-lane drivers, the effects by changing driving direction were more effective than the types of steering wheel due to their habit or traits.

• 전자공학회논문지C
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• 제35C권6호
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• pp.48-55
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• 1998

본 논문에서는 테스트가 용이하도록 ECC(error checking circuit)를 내장하여 테스트를 수행할 수 있는 CAM(content addressable memory)를 설계하였다. 즉, CAM에서 발생하는 읽기, 쓰기 및 매치 동작의 기능 고장을 검사할 수 있는 회로를 내장한 CAM을 설계하였다. 일반적으로 테스트 회로를 내장하면 전체면적의 증가를 가져오게 된다. 본 논문에서는 기존의 병렬 비교기를 사용한 내장(built-in) 테스트 회로의 면적 오버헤드를 줄이기 위해서 새로 제안된 MTA 코드를 이용하였다. 설계한 회로는 VHDL 시뮬레이션을 통하여 검증하였으며, 0.B㎛ double-metal CMOS 공정을 이용하여 레이아웃을 수행하였다. ECC 회로의 경우 CAM의 기본 셀에서 매치기능을 담당하고 있는 XOR회로를 이용함으로써 약 30%정도 면적 감소를 가져왔다.

• Journal of Power Electronics
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• 제16권5호
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• pp.1698-1705
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• 2016

In this paper, a hardware-in-the-loop simulation platform for MMCs is established, which connects a real time digital simulator (RTDS) and a designed MMC controller with optical fiber. In this platform, the converter valves are simulated with a small time step of 2.5 microsecond in the RTDS, and multicore technology is implemented for the controller so that the parallel valve control is distributed between different cores. Therefore, the designed controller can satisfy the requirements of real-time control. The functions of the designed platform and the rationality for the designed controller are verified through experimental tests. The results show that different modulation modes and various control strategies can be implemented in the simulation platform and that each control objective can been tracked accurately and with a fast dynamic response.

• 한국정보과학회논문지:시스템및이론
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• 제27권6호
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• pp.558-566
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• 2000

객체 인식은 고성능 컴퓨팅을 필요로 하는 흥미있는 응용 분야이다. 현재 대부분의 고성능 컴퓨터는 슈퍼스칼라 구조의 범용 마이크로프로세서를 채택하고 있으나, 반도체 집적도가 증가함에 따라 슈퍼스칼라 구조를 대신할 다중처리 마이크로프로세서 구조가 제안되고 있다. 본 논문에서는 다중처리 마이크로프로세서 구조가 객체 인식 응용에 적합한지를 분석한다. 성능 특성을 확인하기 위하여 먼저 프로그램구동방식의 마이크로프로세서 시뮬레이터와 프로그래밍 환경을 개발하였다. 이를 기반으로 시뮬레이션을 수행한 결과, 다중처리 마이크로프로세서가 작은 오버헤드로 쓰레드 수준의 병렬성을 적절히 활용하고 있어 객체 인식 응용에 적합한 구조임을 확인하였다.

• 한국통신학회논문지
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• 제35권12A호
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• pp.1214-1218
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• 2010

본 연구에서는 병렬 결합된 전송 선로에 SIR 구조를 결합하여 가파른 차단 특성과 낮은 상업 손실을 갖는 소형 UWB 대역 통과 여파기를 설계하였다. 대역통과 여파가는 시뮬레이터를 이용하여 최적 설계하였으며, 제작된 대역통과 여파기의 통과대역은 3.1GHz-10.6GHz이고 삽입손실은 8.3GHz에서 0.39dB이며, 반사손실은 9.37GHz에서 12.394dB의 특성을 보였다. 따라서 본 연구에서 제안된 대역통과 여파기는 경량화이면서도 높은 차수가 가지는 가파른 차단 특성이 요구되는 초고속 통신 시스템에 적용될 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.506-506
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• 2000

To improve control performance of a non-linear system, many other researches have used the sliding mode control algorithm. The sliding mode controller is known to be robust against nonlinear and unmodeled dynamic terms. However. this algorithm raises the inherent chattering caused by excessive switching inputs around the sliding surface. Therefore, in order to solve the chattering problem and improve control performance, this study has developed the sliding mode controller with a perturbation estimator using the observer-based fuzzy adaptive network generates the control input for compensating unmodeled dynamics terms and disturbance. And, the weighting parameters of the fuzzy adaptive network are updated on-line by adaptive law in order to force the estimation errors to converge to zero. Therefore, the combination of sliding mode control and fuzzy adaptive network gives rise to the robust and intelligent routine. For evaluating control performance of the proposed approach. tracking control simulation is carried out for the hydraulic motion simulator which is a 6-degree of freedom parallel manipulator.

• Journal of electromagnetic engineering and science
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• 제10권4호
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• pp.316-321
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• 2010

This paper presents a novel fourth harmonic mixer with new structure. The traditional 3-ports fourth harmonic mixer and the novel fourth harmonic mixer are designed by ADS, HFSS and CST simulator. The mixers have been fabricated and tested. The size of the traditional 3-ports fourth harmonic mixer is $12{\times}15$ mm, and the best conversion loss is 18.7 dB according to the measurement. Since the traditional 3-port mixer size is too large to be ranked, we design a novel fourth harmonic mixer for imaging system. The width of the mixing module in the novel fourth harmonic mixer is only 3.65 mm, and this size is fully capable to meet the mixer unit space which is not greater than 5 mm. The simulation result shows that the mixer has good performance, and the experiment result shows that the best conversion loss of the novel fourth harmonic mixer is 16.3 dB at RF signal of 91.3 GHz.