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하드웨어 성능에 종속적인 EtherCAT 마스터 패킷 손실률 개선
안철진(Cheol-Jin An),이현철(Hyun-Chul Yi),김형우(Hyoung-Woo Kim),박성문(Sung-Mun Park),최준영(Joon-Young Choi) 한국정보기술학회 2015 한국정보기술학회논문지 Vol.13 No.4
We propose a packet sending and receiving algorithm for the reliable communication between master node and slave nodes in EtherCAT based network systems. The proposed algorithm is designed to efficiently prevent the packet loss whose occurrence frequency is dependent on hardware performance executing EtherCAT master. The algorithm is applied to open-source based IgH EtherCAT master stack by programming module and application, and is experimented by implementing EtherCAT network consisting of desktop computers with various performance levels and commercial EtherCAT slave devices. Through the experiment, we verify that the packet loss rate of the EtherCAT master depends on the hardware performance level and is improved by the proposed algorithm as preventing all the packet losses.
EtherCAT 네트워크 기반 리눅스 RTAI 개방형 CNC 시스템 구현
박성문,안철진,김형우,이현철,최준영,Park, Sung-Mun,An, Cheol-Jin,Kim, Hyoungwoo,Yi, Hyun-Chul,Choi, Joon-Young 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.10
We propose a method for the implementation of an EtherCAT communication bus in a Linux-based open source Computerized Numerical Control (CNC) system. Recently, increasingly more CNC systems support real-time Ethernet protocols such as EtherCAT, which is a high-performance industrial communication protocol. For real-time CNC control over an Ethernet-based protocol, an additional layer driver needs to be implemented between the CNC system and the master of industrial communication protocol. Among the various solutions for the connection layer driver, we employ a Hardware Abstraction Layer (HAL) driver based on Linux. The operation of the implemented CNC system is demonstrated and confirmed by Hal Meter, which is used to observe the pins, signals, or parameters of HAL.
가중평균 볼테라 커널을 이용한 아날로그-디지털 변환기의 블라인드 비선형 등화기 설계
박성문(Sung-Mun Park),안철진(Cheol-Jin An),김형우(Hyoung-Woo Kim),서원기(Won-Gi Seo),최준영(Joon-Young Choi) 한국정보기술학회 2014 한국정보기술학회논문지 Vol.12 No.9
We propose a new method to design a blind nonlinear equalizer to improve the performance of ADC(Analog-to-Digital Converter) by using a weighted averaged Volterra kernels. We employ the structure of the existing blind equalizer using Volterra series for the basic structure of the designed equalizer. While the Volterra kernels are determined from output signals driven by Gaussian input signals in the existing methods, the Volterra kernels are determined by weightedly averaging a set of Volterra kernels obtained from several single-tone input signals. Consequently, the proposed method enables to design an equalizer without additional experiments for Gaussian signals when ADC’s outputs are available for several single-tone input signals. Applying the designed equalizer to a real ADC model and conducting experiments, we confirm that the equalizer adequately compensates the nonlinearity of ADC. Moreover, comparing the experiment results to those from an existing blind equalizer, we verify that the designed equalizer achieves a similar performance to the existing equalizer.
EtherCAT 네트워크 기반 리눅스 RTAI 개방형 CNC 시스템 구현
박성문(Sung-Mun Park),안철진(Cheol-Jin An),김형우(Hyoungwoo Kim),이현철(Hyun-Chul Yi),최준영(Joon-Young Choi) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.18 No.12
We propose a method for the implementation of an EtherCAT communication bus in a Linux-based open source Computerized Numerical Control (CNC) system. Recently, increasingly more CNC systems support real-time Ethernet protocols such as EtherCAT, which is a high-performance industrial communication protocol. For real-time CNC control over an Ethernet-based protocol, an additional layer driver needs to be implemented between the CNC system and the master of industrial communication protocol. Among the various solutions for the connection layer driver, we employ a Hardware Abstraction Layer (HAL) driver based on Linux. The operation of the implemented CNC system is demonstrated and confirmed by Hal Meter, which is used to observe the pins, signals, or parameters of HAL.