• Proceedings of the IEEK Conference
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• 2002.06e
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• pp.193-196
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• 2002

In this paper, we presents the remote inspection activity with a mobile robot at the calandria face areas of the PHWR (pressurized heavy water reactor) nuclear power plants during full power plant operation.. The tele-operated mobile robot has been developed for this task. A 4 wheeled mechanism with the dual reconfigurable crawler arm has been adopted for the ease access to the high radiation area of calandria face. A specially designed extendable long reach mast attached on the mobile platform and the thermal image monitoring system enable human eyes to look into the calandria face. Application of robot will keep human workers from high radiation exposure and enhance the reliability of nuclear power plants.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.178-180
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• 2006

저 전력 마이크로 프로세서와 무선 통신 모듈, 통합된 시스템 장치들을 내장한 센서 노드를 이용하여 구축 된 센서 네트워크는 동작환경과 구조가 특이하며 시스템 설계 시 많은 제약 조건들이 고려되어야 한다. 이러한 센서 네트워크의 각 노드는 센서를 이용한 정보 수집과 같은 여러 가지 응용 프로그램, 노드 간 통신, 제한된 시스템 자원을 효율적으로 관리 할 수 있는 기능들이 필요하며 이에 센서 노드를 위한 여러 가지 운영체제들이 제안되었다. 본 논문에서는 센서 노드를 위해 효과적이고 응용의 변화에 대처할 수 있도록 동적 재구성 기능을 지원하도록 설계된 유한 상태 머신 (finite state machine) 기반의 운영체제인 SenOS의 특징과 구현된 SenOS를 개선한 결과를 발표한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.1195-1198
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• 2005

Radio Frequency Identification(RFID)를 이용한 물류 시스템은 바코드를 대체할 시스템으로 주목받고 있다. 이러한 RFID 를 이용한 물류 시스템이 실제로 적용하는 데에는 매우 큰 설치 비용이 문제로 제기된다. 이를 해결하기 위해 무선으로 연결되는 이동형 RFID 리더를 이용한다. 한편 동기화 모드 및 비동기화 모드로 전송되는 RFID 데이터의 특성과 기존의 라우팅 기법의 브로드캐스트에 따른 오버헤드를 줄이기 위해 재구성 가능한 클러스터 기반의 라우팅 기법이 적합하다. 따라서 RFID 창고 관리 시스템을 위한 재구성 가능한 클러스터 기반의 라우팅 기법을 제안한다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2001.06a
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• pp.81-84
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• 2001

A signal path control switch has been designed and implemented with AT&T 0.5${\mu}{\textrm}{m}$ CMOS ORCA FPGA. This device controls the path of digital signals in SDH-based transmission system. The proposed switch is suitable for self-healing operation which protects against transmission network failure. The self-healing operation of the switch is effectively done by the reconfigurable information stored in the registers of the switch. This device consists of eight subparts such west-east transmitting parts, west-east receiving parts, add-drop control parts, AIS control Part, and CPU interface part. The device is capable to a ring network as well as a linear network.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1997.11a
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• pp.67-72
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• 1997

본 논문은 저비용이면서 정확한 제어를 수행하는 새로운 퍼지 제어기의 재구성 가능한 FPGA 시스템상의 구현을 다룬다. 제안한 퍼지 제어기 (Fuzzy Logic Controller : FLC)의 시스템 구조와 이의 VHDL 설계 및 시뮬레이션은 다른 논문에 나타나 있다. 제안한 퍼지 제어기의 구현 과정은 다음과 같다. 각 모듈은 VHDL 언어에 의해서 기술된 뒤, Synopsys사의 FPGA 컴파일러에 의해 합성된다. 합성된 각 모듈은 Xilinx사의 XactStep 6.0에 의해 최적화 및 배치, 배선이 이루어진다. 얻어진 Xilinx rawbit 파일은 VCC사의 r2h에 의해 C 언어의 header 파일 형태의 하드웨어 object로 변환된다. C언어 형태의 하드웨어 object를 포함하는 응용 제어 프로그램이 C 컴파일러에 의해 컴파일된 후, 이 실행 파일이 재구성 가능한 FPGA 시스템 상에 다운로드된다. 제안한 퍼지 제어기를 EVCI 보드 상에 동적으로 구현하여 트럭 후진 주차 제어에 사용할 때 걸리는 시간을 Synopsys사의 VHDL 시뮬레이터와 워크스테이션상에서 C언어에 의해 구현하여 트럭 후진 주차 제어에 사용할 때 걸리는 시간을 각각 비교하였다.

• Journal of Institute of Control, Robotics and Systems
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• v.16 no.7
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• pp.661-667
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• 2010

This paper presents a failure diagnosis and accommodation strategy which is capable of tolerating faulty actuators of a submersible vehicle. The proposed method is mainly based on a sliding mode control technique. The primary ideas include a performance index to describe the effectiveness of actuators, and a controller reconfiguration strategy using the actuator effectiveness index. The actuator effectiveness proposed in this work is defined as the relationship between the sliding surface and the controlled system behavior. The resulting actuator effectiveness is then used in reconfiguring the controller in order to counteract for the deteriorated control performance in the presence of a faulty actuator. The effectiveness of the proposed method is demonstrated by means of numerical simulations with a submersible vehicle.

• Journal of the Korean Institute of Intelligent Systems
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• v.11 no.8
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• pp.746-753
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• 2001

In this paper, we review the basic concept of Evolvable Hardware first. And we examine genetic algorithm processor and hardware reconfiguration method and implementation. By considering complexity and performance of hardware at the same time, we design genetic algorithm processor using modularization and parallel processing method. And we design frame that has connection structure and logic block on FPGA, and embody reconfigurable hardware that do so that this frame may be reconstructed by RAM. Also we implemented ECANS that information processing system such as living creatures'brain using this hardware reconfiguration method. And we apply ECANS which is implemented using the concept of Evolvable Hardware to time-series prediction problem in order to verify the effectiveness.

• Journal of electromagnetic engineering and science
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• v.17 no.1
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• pp.14-19
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• 2017

In this paper, a planar directional beam-switchable antenna with four orthogonal beam directions is proposed. The proposed antenna is designed with two crossed active elements and two parasitic elements for each direction. The design methodology is described on the basis of the Yagi-Uda method for the active and parasitic elements, respectively. By adjusting the effective electric lengths of the parasitic elements, the roles of a director and a reflector are exchanged with each other. The planar four-way beam-switchable Yagi-Uda antenna is implemented. From the experimental results. The proposed design method is verified for orthogonal radiation beam switching.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.30B no.6
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• pp.9-19
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• 1993

This paper presents a new concept of a reconfigurable manipulator system which adjusts its mechanical structure to suit the kinematic characteristics of a given task. A highly redundant manipulator designed as a general purpose manipulator needs to be reconfigured for a specific task. A general task can be decomposed of motion and force components with different control requirements: either gross motion control or fine motion control. Each of these task components are distributed to each part of the manipulator based on the control requirements and the structure of the manipulator. Through the reconfiguration, a redundant manipulator is decomposed into two local arms, and the kinematic characteristics of each local arm is adjusted to suit the assigned task. The reconfigured redundant manipulator has two local arms well-configured for the local tasks and cooperating in serial for a given task. This globally enhances the performance of a redundant manipulator to execute a specific task. The simulation results are shown.

• ETRI Journal
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• v.39 no.5
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• pp.632-642
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• 2017

Digital all-optical parallel computing is an important research direction and spans conventional devices and convergent nano-optics deployments. Optical bus-based interconnects provide interesting aspects such as relative information communication speed-up or slow-down between optical signals. This aspect is harnessed in the newly proposed All-Optical Linear Array with a Reconfigurable Pipelined Bus System (OLARPBS) model. However, the physical realization of such communication interconnects needs to be considered. This paper considers spatial layouts of processing elements along with the optical bus light paths that are necessary to realize the corresponding interconnection requirements. A metric in terms of the degree of required physical constraint is developed to characterize the variety of possible solutions. Simple algorithms that determine spatial layouts are given. It is shown that certain communication interconnection structures have associated intrinsic topologies.