• Journal of the Semiconductor & Display Technology
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• v.22 no.2
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• pp.11-16
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• 2023

EtherCAT is an Ethernet-based fieldbus system standardized in IEC 61158 and SEMI, and widely used in the fields of factory automation, semiconductor equipment and robotics. In this paper, without operating system, we have implemented an EtherCAT master with an open source EtherCAT master stack SOEM on STM32 Nucleo-144 board with an STM32F767 microcontroller. And its jitter performance has been evaluated at the output of the network port to include all the effects of the entire system in the results. The results show that the implemented EtherCAT master has precise control performance for control frequencies from 1KHz to 8KHz and relatively superior jitter performance compared to the EtherCAT masters with real-time patched Linux operating system.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1391-1393
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• 2021

본 시스템은 항만지역에서 지속적으로 발생하는 안전사고에 대응하기 위하여 사물인터넷 기술을 적용한 스마트 웨어러블 기기를 활용하여 근로자의 추락, 협착, 충돌 등 사고 정보를 실시간 수집하고 GIS기반의 모니터링 서비스를 통해서 위급 상황 발생 시 능동적이고 즉각적인 구조 활동 지원 및 골든타임 확보와 지속적 분석을 수행하여 귀중한 인명사고 구조체계를 개선하는데 목적이 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.849-852
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• 2008

Distributed Network Protocol은 Master와 Slave 개념을 적용한 이벤트 감시와 하나의 Master가 다중 Slave의 제어가 필요한 환경에서 유용하게 사용되고 있는 통신 Protocol이다. DNP는 현재 개방형 Protocol로 에너지와 관련된 산업계 분야에서 사실상의 표준으로 적용되어 사용되고 있다. 현재 상용화되고 있는 ASE2000과 DNP3의 분석을 토대로 Master와 Slave Station을 Simulation 하고 DNP3 Message를 Generate하여 Serial Port를 사용해 종단 간에 통신하는 DNP3 Call Simulator를 설계 및 구현하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.151-153
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• 2010

In this paper, the tri-band planar monopole microstrip antenna which stimulaneously meets the three bands such as TRS, WLAN and DMB is designed. The designed antenna size was smaller using CPW-fed structure that shows a ground-plane and a patch-plane are existed at one layer. The proposed antenna is designed on FR-4 substrate with a relative dielectric constant 4.3, thickness of 1.5mm and tangent loss 0.04. The designed antenna shows that VSWR is below 2 and has good return loss below -10dB over the three bandwidths.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.145-147
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• 2010

This study is the visually emotional identification lighting for easy to distinguish using 3colors LED on AtoN facility in shore and harbor, which have realized a controller for certainly express the mouth of a harbor by red light and green light of both sides a harbor and for synchronization at a time of right and left or serial sequential the harbor guidance light through synchronizer or timer by GPS. There is expectation effect that is prevent a confusion about distinguish of facility by ship's operator and to beautify a night scene of harbor, which is expressed to emotional identification lighting differ from great many lighting of harbor with variable color lighting the lighthouse body and vertical layer color lighting using LED. The function of AtoN is adapted that guidance light through synchronization or serial sequential lighting and display of harbor safety message by CW lighting, and this system is the power consumption greatly reduce by candle alternated high light LED.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.143-144
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• 2010

Recently, IALA has introduced AIS AtoN and standardized Aids to Navigation communication system and the World-wide IALA-Net has announced plans to build the system. Systematic beacon network may offer opportunities to make infrastructure for information service and upgrade AtoN service performance. This paper proposes Aids to Navigation information service network for e-NAV. Network based on AIS is consist of AIS AtoN channels as Real, Synthetic or Virtual AIS AtoN. And inner network is consist of Wireless networks as AIS, WCDMA, WIFI, WlBRO, USN or VSAT. Introducing of various network systems can lead to combine and design among land, beacon and service network infrastructures.

• Journal of Navigation and Port Research
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• v.28 no.10 s.96
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• pp.881-889
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• 2004

Using the ETC Service, it is now possible to charge a vehicle for driving pass a specific toll booth electronically, without the vehicle even having to slow down. The smart card and card reader used to collect tolls electronically have a serious problem which it dose not have a standard for the ETC system. In this paper, we suggest the ETC system using mobile phone to collect tolls efficiently instead of existing system which is consist of a Interface Module to connect between a mobile phone and OEE, a mobile phone to send the information of tollgate fees and OEE to communication with RSE of roadway in the vehicle. This primary focus of this system is the IM functions and protocol to assist of the existing mobile phone and OBE.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.43 no.10 s.352
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• pp.45-53
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• 2006

In this paper, we proposed a parallel hardware architecture for deblocking filter in K264/AVC. The deblocking filter has high efficiency in H.264/AVC, but it also has high computational complexity. For real time video processing, we chose a two 1-D parallel filter architecture, and tried to reduce memory access using dual-port SRAM. The proposed architecture has been described in Verilog-HDL and synthesized on Hynix 0.25um CMOS Cell Library using Synopsys Design Compiler. The hardware size was about 27.3K logic gates (without On-chip Memory) and the maximum operating frequency was 100Mhz. It consumes 258 clocks to process one macroblock, witch means it can process 47.8 HD1080P(1920pixel* 1080pixel) frames per second. It seems that it can be used for real time H.264/AVC encoding and decoding of various multimedia applications.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.6
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• pp.83-88
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• 2017

In this paper, a 3-port waveguide circulator of Ka-band millimeter-wave for isolation between transmit channel and receive channel at high power transmit mode is designed and fabricated for the seeker of the guided missile and circulator performance is verified through the S-parameter, high power and operation temperature test. At the configuration design, interface design between a seeker antenna and the circulator is considered and half-height of standard waveguide is applied for minimum and light weight body. The shape of permanent magnet and ferrite is optimized by simulation and tuning dielectrics at each port are placed for the best performance. In Fc(center frequency)${\pm}1000MHz$, designed waveguide circulator has below -20 dB return loss, below 0.5 dB insertion loss and below -23 dB isolation. It is found that circulator characteristics is similar to design results.

• Journal of Navigation and Port Research
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• v.42 no.4
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• pp.267-276
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• 2018

Leisure boat design requires a comprehensive approach combining emotion with engineering technology, and requires designers to constantly exchange information and cooperate with engineers during the design process. This study suggests a design process and design methods suitable for leisure boat design. The design process consists of five steps: understanding, exploring, analyzing, developing, and validating based on the designer's thinking process. Design methods were suggested to foster collaboration and communication between designers and engineers at each phase. This process and methods were applied to the hydrofoil-boat design and evaluated. The results suggest that the design methods promote cooperation and communication between the designer and the engineer and facilitate mutual understanding and trust.