• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2012.10a
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• pp.391-392
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• 2012

항로표지의 원격 관리를 VHF, CDMA, TRS의 경로설정 최적화(Path Optimization) 기능을 갖는 하이브리드 통신을 이용하면 개별 통신 방식별로 음영지역이 존재하는 경우에도, 최적의 통신방식을 선택하여 통신을 수행하게 됨으로써, 통신 음영지역의 해소가 가능하다. 또한 통신장치마다 동일한 데이터 프레임을 사용함으로써 데이터의 호환성을 높였다. 실험은 30일 동안 각 부표에서 매 5분마다 데이터를 취득하였으며, 데이터 수신율은 99.4 % 이상을 보였다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.286-288
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• 2003

본 논문에서는 서로 다른 네트워크간의 다양한 프로토콜과 이종의 트래픽을 동시에 처리할 수 있는 네트워크용 SoC (System-on-a-Chip) 프로세서를 구현하였다. 제작된 네트워크 SoC 프로세서는 ARM 프로세서 코어와 ATM(Asynchronous Transfer Mode) 블록, 10/100 Mbps 이더넷 볼록, 스케쥴러, UART 등을 이용하였고 각 블록은 AM8A (Advanced Microcontroller Bus Architecture) 버스로 연결하였다. SoC 프로세서는 CADENCE사의 VerilogHDL을 이용하여 설계하였고 0.35$\mu\textrm{m}$ 셀 라이브러리를 이용하여 검증하였다. 구현된 칩은 총 게이트수가 312,000개이며 칠의 최대 동작 주파수는 50MHz 이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.5-6
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• 2019

보통 MCU를 기반으로 하는 임베디드 소프트웨어는 펌웨어 형태로 구현되어 콘솔이 없고, UART는 데이터 송신용으로 사용된다. 그러나 MCU 소프트웨어에 콘솔 드라이버를 구현하면 유닉스·리눅스와 같은 대화적 표준 입·출력 개발환경과 타스크 개념을 실현할 수 있다. 이 논문에서는 운영체제 교과에서 익힌 내용을 바탕으로 Atmega2560 MCU에 인터럽트 기반 콘솔 장치 구동기를 구현하고 실험한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.869-872
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• 2008

This paper presents the VHDL implementation procedure of the passive RFID tag in Ultra High Frequency RFID system. The operation of the tag compatible with the EPCglobal Class1 Generation2(GEN2) protocol is verified by timing simulation after synthesis and implementation on prototyping board. Due to the reading range with relatively large distance, a passive tag needs digital processor which facilitates faster decoding, encoding and state transition for enhancement of the interrogation rate. Also with UART communication, verify a inventory Round in Gen2 Protocol. The verification results with the fastest data rate, 640kbps, and multi tags environment scenario show that the implemented tag spend 1.4ms transmitting the 96bits EPC to reader.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.8
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• pp.1254-1260
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• 2009

CDMA tele-Controller system is designed with a low power consumption 8 bit microcontroller, ATmega 2560. ATmega 2560 microcontroller consists of 4 UART (Universal asynchronous receiver/transmitter) ports, 4 kbytes EEPROM, 256 kbytes flash memory, 4 kbytes SRAM. 4 URAT is used for CDMA modem, communication for GPS module, EEPROM is used for saving a configuration for program running, a flash memory of 256 kbytes is used for storing a F/W(Firm Ware), and SRAM is used for stack, storing memory of global variables while program running. We have tested the communication distance between the coast station and sea by the fabricated control board using 800 MHz CDMA modem and GPS module, which is building for the navigational aid management system by remote control. As a results, the receiving signal strength is above -80 dBm, and then the characteristics of the control board implemented more than 10 km in the distance of the communication.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.1
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• pp.78-85
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• 2014

The Mu-communication board supported by hybrid communication is designed with Cortex M3, which is a low power energy consumption 32-bit microcontroller. The Cortex M3 microcontroller has UART(Universal asynchronous receiver/transmitter) ports which can set appropriately using the command line interpreter (CLI) program with each port. URAT ports are used for hybrid communication modems, GPS modules, etc. When the socket type was compared with the short message service type, the socket type was proven to be better. By improving the receiving performance in the control and management system of the AtoN, data loss was minimized. During the testing of the socket and SMS, data was collected from each buoy for 12 hours every 1 minute and the receiving rate of the data was found to be more than 98.58 % and 99.42 % respectively.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.185-187
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• 2012

In this paper, the MR fluid damper to the application of the paramagnetic (paramagnetic) particles dispersed in the MR fluid inside the magnet current caused by the MR damper using the principles of the internal fluid delivery yield stress variation is characterized in Silky. In other words, the current strength of the MR fluid damper according to the internal friction coefficient varies phenomenon is to use. The MR fluid damper to control the MCU that you want to use Microchip's dsPIC chips, and current control in order to improve performance by using the PWM and UART communication to an external monitor to monitor the entire system was designed. In this study using MR fluid dampers and dsPIC chip dehydration process happens when a washing machine vibration and noise, vibration and noise reduction sikidorok washing machine protection systems are proposed.

• Journal of Astronomy and Space Sciences
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• v.31 no.3
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• pp.235-240
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• 2014

The communications link in a space program is a crucial point for upgrading its performance by handling data between spacecraft bus and payloads, because spacecraft's missions are related to the data handling mechanism using communications ports such as a controlled area network bus (CAN Bus) and a universal asynchronous receiver and transmitter (UART). The NEXTSat-1 has a lot of communications ports for performing science and technology missions. However, the top level system requirements for the NEXTSat-1 are mass and volume limitations. Normally, the communications for units shall be conducted by using point to point link which require more mass and volume to interconnect. Thus, our approach for the novel communications link in the NEXTSat-1 program is to use CAN and serializer and deserializer low voltage differential signal (SerDesLVDS) to meet the system requirements of mass and volume. The CAN Bus and SerDesLVDS were confirmed by using already defined communications link for our missions in the NEXTSat-1 program and the analysis results were reported in this study in view of data flow and size analysis.

• Journal of Satellite, Information and Communications
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• v.7 no.3
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• pp.130-134
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• 2012

This paper introduces a home network service system using a low-cost wireless router on OpenWrt which can be remotely controled by Android devices. The proposed system consists of an embedded system development platform for home network service control based on OpemWrt embedded Linux, an embedded system development platform, a remote control on Android, and a home linghting device made by an interface board with LEDs. The prototype system is made of a wireless router of Buffalo, WZR-HP-G450H, Arduino Uno interface board with LEDs, and an Android development kit of HBE-SM5-S421. The operation was performed by TCP/IP programming for Android remote control, socket programming between Android development kit and wireless router, and UART communication programming between the interface board and wireless router. The implementation result shows that a low cost home network systme could be implemented with a wireless router.

• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.92-99
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• 2016

AIS(Automatic Identification System) is an vessel traffic management system which exchanges vessel data with other nearby ships, AIS base stations using VHF band. A domestic AIS base station is located along coast lines or island. So it is difficult to collect vessel data from the ocean. To solve this problem, we adopted AIS payload on the low earth orbit satellite. The AIS payload on the satellite is interfaced with OBC(On-Board Computer) via UART and the FSW(Satellite Flight Software) manages it. The FSW have to receive AIS command from ground station and forward to AIS payload. Similarly FSW have to receive response, OBP, OGP data from AIS payload and it is downlink to the ground station. So in this paper we describe the FSW design & implementation for AIS payload.