• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.2
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• pp.360-368
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• 2010

MiTS communication is a protocol for the exchange of various information among shipboard systems. It also specifies more than 30 specialized message formats for the information exchange. To build MiTS systems, therefore, the messages should be processed consistently. This paper proposes the design and implementation of such message processing modules. It also describes the test results of the implemented modules.

• Journal of Satellite, Information and Communications
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• v.9 no.4
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• pp.82-86
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• 2014

In this paper, we propose a novel modulation scheme specialized in real time broadcast system using a multicopter. Since multicopters have many advantages in aerial photography, they have been widely used in broadcasting technologies. However, because of restrictions on flight time, it is difficult to utilize multicopters in real time broadcasting systems. Therefore, video transmission using multicopter is necessary for low power communication techniques in air channel environment. Performance results of the hybrid modulation in this paper are compared to that of conventional modulations with Bit Error Rate (BER) and Signal to Noise Ratio (SNR) simulations. The results also showed that proposed system is suitable for aerial photography. Experiments demonstrated the superiority of the proposed modulation scheme by showing received symbols through an USRP equipment.

• Proceedings of the KIEE Conference
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• 2007.11b
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• pp.84-86
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• 2007

통신 및 디지털 연산 기술의 비약적인 발전은 변전소 내부의 정보를 공유 및 통합시켜 변전소 자동화 시스템을 등장할 수 있는 계기가 되었다. 그러나 변전소에 적용된 자동화 시스템은 152 종류의 서로 다른 프로토콜이 사용되어 IED(Intelligent Electronic Device)간 통신이 어려움에 직면하게 되었다. 따라서 이종 IED간 원활한 정보 공유가 가능하도록 변전소에 표준화된 통신 아키텍쳐로서 IEC 61850 통신 프로토콜이 규정되었다. 이 논문은 변전소 내부에 IEC 61850 통신 프로토콜을 이용한 IED간 통신 클라이언트 모듈을 개발한 사례를 소개하고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.4
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• pp.810-816
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• 2011

The existing underwater acoustic communications modem is developing based on commercial products, so it is possible on functionality and performance of underwater acoustic communications modem implementation. But the production of development system is required to single platform system implementation at the system's size and cost. So this paper designs and implements the signal processing module as an important role to single hardware platform production of underwater acoustic communication modem by using TigerSHARC DSP processor.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1331-1332
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• 2015

본 논문은 CAN(Controller Area Network) 통신의 WCRT(Worst Case Response Time) 분석을 통해 IEEE1212 기반 RTU(Remote Terminal Unit)의 통신 신뢰성을 검증한다. RTU는 원격지에서 네트워크를 구성하여 각 모듈들로부터 획득한 정보를 서버로 전송하거나 원격지를 제어하는 역할을 한다. 본 논문에서 대상으로 하는 RTU의 네트워크는 물리계층과 데이터링크 계층은 CAN을 사용하고 응용계층은 IEEE1212 기반으로 통신한다. 즉, RTU를 구성하는 모듈은 각각메모리 영역을 가지고 있고, CAN ID에 메모리 주소를 포함하여 해당 영역을 쓰는 구조로 통신을 한다. 첫 번째로 이러한 응용계층을 고려하여 WCRT를 계산하는 방법을 제시하고, 두 번째로 CAN 메시지의 우선 순위를 최적화하는 방법을 고찰한다. 마지막으로 시험 환경을 구축하고 시뮬레이션을 통해 앞에서 선정한 우선순위에 따라 통신 신뢰성을 검증한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11b
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• pp.1139-1142
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• 2002

DRM(Digital Rights Management)은 디지털 컨텐츠를 암호화하여 인터넷상에서 안전한 거래를 보장하며, 저작권자의 권리를 보호하는 기술로, 디지털 컨텐츠 유통 문제점에 관한 해결방안을 제시하고 있다. 그러나, 현재 디지털 컨텐츠 유통 주체 상호간 인증을 바탕으로 한 비밀 통신, 통신의 무결성 등을 위한 보안통신은 제대로 이루어지지 않고 있다. 또한, SSL(Secure Socket Layer)은 현재 보안 통신 메커니즘으로 가장 널리 사용되며, PKI기반 암호 통신 메커니즘이기 때문에 안정성이 높게 평가된다. 이에 본 논문은 DRM 유통 시스템에서 보안 통신을 제공하기 위한 최적화된 SSL 모듈을 설계하며 구현을 목적으로 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.258-261
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• 2010

The existing underwater acoustic communications modem is developing based on commercial products, so it is possible on functionality and performance of under water acoustic communications modem implementation. But the production of development system is required to single platform system implementation at the system' s size and cost. So this thesis designs and implements the signal processing module as an important role to single hardware platform production of underwater acoustic communication modem by using TigerSHARC DSP chip.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.6
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• pp.620-628
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• 2010

Small satellites can be used for various space research and scientific or educational purposes due to advantages in small size, low-cost, and rapid development. Small Satellites have many advantages of application to Responsive Space. Compared to traditional larger satellites, however, Small satellites have many constraints due to limitations in size. Therefore, it is difficult to expect high performance. To approach maximum capability with minimal size, weight, and cost, standard modular platform of Small satellites is necessary. Modularity supports plug-and-play architecture. The result is Small satellites that can be combined quickly and reliably using plug-and-play mechanisms. For communication between modules, standard bus interface is needed. Controller Area Network(CAN) protocol is considered optimum data bus for modular Small satellite. CAN can be applied to data communication with high reliability. Hence, design optimization and simplification can also be expected. For ease of assembly and integration, modular design can be considered. This paper proposes development method for standardized modular Small satellites, and describes design of data interface based on CAN and a method of testing for modularity.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.4
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• pp.709-718
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• 2021

In this paper, it can be seen that the number of abandoned dogs increases every year through the statistics on the occurrence of abandoned animals. With the goal of reducing the number of stray dogs, a smart pet dog shoulder strap is implemented based on a real-time location tracking system using the ESP32 module and GPS sensor. It is an ESP32 module with a built-in Bluetooth module. It is input to the MCU using various sensors, and finally outputs to a smart-phone application, and communicates through the built-in blue-tooth module. In addition, it uses Neopixels to compensate the weaknesses at night through LED light emission, and automatically sets the warning distance to design a music playback system through the LED flashing effect and MP3 module. In addition, a smart pet dog shoulder strap was designed to help pet dog health care by measuring the moving distance according to the amount of activity through the gyro sensor.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.50 no.2
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• pp.127-135
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• 2022

Compared to the continuous increase of domestic nano-satellite development cases, the initial communication success rate is relatively low. In a situation where communication cases of LEO satellites using commercial satellite communication networks are increasing recently. In this situation, the SNIPE project developed by the KASI(Korea Astronomy and Space Science Institute), KARI(Korea Aerospace Research Institute), and Yonsei University apply an Iridium module for communication test to the SNIPE nano-satellites. Therefore, in this paper, the visibility analysis of the iridium module on the SNIPE satellite was analyzed under considering the orbital and communication environment of the iridium satellite constellation and the attitude control mode. In the case of LEO satellites, the communication possibility was limited due to the relatively small iridium communication coverage for high altitude and the high doppler shift considered in the iridium communication network. For this reason, in this paper, it could be simulated that there was a more performance difference according to the difference in relative RAAN(Right Ascension of Ascending Node) angle with the Iridium constellation. Finally, by checking the visibility of communication module under the tumbling situation that occurred during the initial deployment of the nano-satellite, the possibility of using the iridium communication technology was analyzed.