• Journal of Biomedical Engineering Research
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• v.18 no.4
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• pp.447-456
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• 1997

When the disabled is operating a rehabilitation assisting system with a joystick by himself, unlike in the case of a normal person, tremor with joystick control or instant miscontrol can often occur. If these misoperations should be directly relayed to the system, shaking or malfunction of the mobile rehabilitation assisting system might be the result. The safety of the disabled is of prime concern. To solve this problem, that is, to prevent the miscontrol of the disabled operator and avoid crashes into his or her surroundings, we propose the force-reflection locomotion algorithm with the joystick. This method uses ultrasonic sensors to measure the distance between the object and mobile robot. Based on the reception of sensory data, the necessary torque is applied via the joystick to the attatched motor. To confirm the effectiveness of the proposed method, the subjects on the reflected force by the dynamic characteristics of the joystick and the reflected force by the distance information are tested Even though there are some differences in human dexterity, we confirmed the fact that the information from the obstacles was relayed to the operator via the joystick and resulted in an improved operational performance and safety level with regard to those obstacles.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.1
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• pp.152-159
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• 2010

High power density and power conversion efficiency have been required in the power converters according to the rapid growth of industry. In this context, the next generation High Speed Train(HST) requires power converter which has high-efficiency, high-performance and high-density. In this paper, the new control technique for battery charger used for the next generation HST is proposed. The phase shift ZVZCS converter is classified according to a resonant circuit which is located in the primary or secondary side. In this paper, The PWM switching technique using all-pass filter is proposed to control ZVZCS converter which has resonant circuit in the secondary side. ATmega_128 micro controller based in all-pass filter in substitute for phase shift IC is presented to have digital control. To verify the proposed topology, the simulation and experiment are performed by using PSIM software and 1[kW] experimental set-up.

• The Transactions of the Korean Institute of Power Electronics
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• v.12 no.5
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• pp.400-408
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• 2007

In this paper, development of the 8kW parallel module converter is presented. For a effective configuration of FB-PWM converter, this paper proposes 4-parallel operation of 2 kw-module. FB converter of 2-kW module is controlled by phase shut PWM and in order to achieve ZVZCS, the simple auxiliary circuit is applied in secondary side. In order to achieve ZCS, control logic for auxiliary circuit operation is designed to reset the primary current during free-wheeling period. For output current sharing of 4-modules, the charge control is employed. The charge control logic is designed with phase shift PWM logic. Voltage controller is implemented by using DSP(TMS320LF2406) with A/D conversion data of the output current and voltage of each module. The developed converter is installed in PCU(Power Conditioning Unit) for HSG(High Speed Generator) in a vehicle and health monitoring system is implemented for vehicle operation test. Finally, performance of the developed converter is proved under practical operation of HSG.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.5
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• pp.1058-1067
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• 2004

Java virtual machine provides code compactness, simple execution engines, and platform-independence which are important features for small devices such as mobile or embedded device, but it has a big problem, such as low throughput due to stack-oriented operation. In this paper hardware lava accelerator targeted for mobile or embedded application is designed to eliminate the slow speed problem of lava virtual machine. The designed lava accelerator can execute 81 instructions of Java virtual machine(JVM)'s opcodes and be used as Java coprocessor of conventional 32-bit RISC processor with efficient coprocessor interface and instruction buffer. It consists of about 14,300 gates and its maximum operating frequency is about 50 Mhz under 0.35um CMOS technology.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.7
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• pp.389-397
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• 2014

This paper focuses on advanced receiver for interference suppression or cancellation from neighbor cells in the 3GPP Rel-12 standard. From UE (User Equipment) perspective, the advanced receiver which can manage inter-cell interference of adjacent cell is required to support and manage fast-growing wireless data traffic. In 3GPP standard, NAICS which is one of approaches to improve SINR and receiver performance by directly suppression or cancellation of data (PDSCH) and control (PDCCH) signal from interference cells is discussed. In this paper, we briefly introduce the concept and candidate receivers for NAICS (Network Assisted Interference Cancellation and Suppression) based on 3GPP Rel-12 standard, and simulation results for basic NAICS receiver performance are provided.

• Transactions of the Korean Society of Automotive Engineers
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• v.21 no.5
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• pp.54-58
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• 2013

In recent days, vehicles have become equipped with electric systems that assist and help drivers driving safe by reducing possible accidents. LDWS(Lane Departure Warning System) and LKAS(Lane Keeping Assistant System) are involved in assist systems, especially for lateral motion of vehicles. Sudden and inattentive lateral motion of vehicles due to drivers' fatigue, illness, inattention, and drowsiness are major causes of accidents in highway. LDWS and LKAS provide drivers with warnings or assisting power to reduce any possibilities of accidents. In order to prevent or minimize the possibilities of accidents, lateral motion control of vehicles has been introduced in this research. DGPS/RTK(Differential Global Positioning System/Real Time Kinematics) and GIS(Geographic Information System) have been used to obtain the current position of vehicles and decide when activate controlling lateral motion of vehicles. The presented lateral motion control has been validated with actual vehicle tests.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.9 no.5
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• pp.191-197
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• 2009

In this paper, multi-variable fuzzy model for efficient combustion control of refuse incineration plant is obtained. First, to obtain model of incineration plant which is complex and nonlinear multi-variable fuzzy modeling is performed. Obtained multi-variable fuzzy model predicts outputs of incinerator almost exactly. Then using multi-variable fuzzy model we can build simulator which is used as operation simulator for building of control strategy and training of operator.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.2049-2050
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• 2011

신체 움직임이 자유롭지 못한 중증 장애인의 경우 환경제어장치를 사용하면 일상생활 보조가 가능해지므로 활용 효과가 매우 크다. 그러나 현재 국내에서 개발되는 제품은 정상인을 위한 홈오토메이션이 대부분이고, 장애인을 위한 환경제어장치의 경우에도 입력 매체에 따라 대상 사용자가 제한되는 문제점이 있었다. 따라서 본 논문에서는 기존의 입력 장치 사용에 제한이 있었던 중증 장애인들도 사용가능하도록 1-채널 생체신호(뇌파 및 얼굴 근전도) 계측 시스템 및 환경제어장치를 개발하였다. 향후 개발된 시스템은 중증 장애인의 일상생활 체험관에 구축하고 장애인의 사용성 평가를 통해 그 효과를 입증하고자 한다.

• Proceedings of the KIEE Conference
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• 2006.07d
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• pp.2041-2042
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• 2006

홈 네트워킹이 이슈화 되면서 많은 기능들을 내장한 홈 네트워크 제품이 개발되어지고 또한 판매되고 있다. 이러한 기능의 추가로 인하여 홈 네트워크 제품들의 소비전력 및 대기전력 또한 증가하고 있다. 본 고에서는 이러한 정보가전기기가 정상동작을 하지 않는 대기동작시의 전력소모량을 줄이기 위하여 기존에 많이 사용하였던 플라이백구조의 SMPS에 디지털 제어블럭 및 보조 SMPS를 이용하여 대기전력 소모량이 적은 디지털제어 전원공급시스템을 구현해 보았다. 이 시스템은 통신기능을 지원하도록 설계함으로써 네트워크 모뎀과의 통신을 통해 외부에서의 원격제어 및 모니터링이 가능하다.

• Proceedings of the KIEE Conference
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• 1999.07b
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• pp.636-638
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• 1999

본 논문에서는 선형 대규모 시스템(large-scale systems)에 대하여 강건한 분산 제어기를 설계한다. 동일한 부시템(identical subsystems)들이 서로 대칭적으로 연결되어 있는 제어기 설계 시 불확실성은 부시스템 행렬과 연결 시스템 행렬의 유계된 매개 변수 변동을 모두 고려한다. 본 논문의 설계 절차는 대칭 연결 구조를 불확실성으로 포함시킨 하나의 인공적인 보조 시스템(artificial auxiliary systems)으로 번환 함으로써 대규모 시스템에 대한 분산 제어기 설계의 복잡성을 줄일 수 있음을 보이고 수치 예를 통해 이를 확인한다.