• ETRI Journal
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• 제31권3호
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• pp.348-350
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• 2009

To fit the limited volume and power consumption of the passive radio frequency transmission system of the electronic time fuze, an improved coded mark inversion (CMI) is proposed in this letter. From the performance analysis, the energy transmission efficiency of this encoding method is at least 50% higher than that of CMI and NRZ. Finally, the experiment results show that by adopting this improved CMI, the change of DC voltage through magnetic coupling is lower than 0.2 V when the accuracy of data transmission is above 99.5%.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권2호
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• pp.649-663
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• 2012

We propose a percolation based M2M networking architecture and its data transmission method. The proposed network architecture can be server-free and router-free, which allows us to operate routing efficiently with percolations based on six degrees of separation theory in small world network modeling. The data transmission can be divided into two phases: routing and data transmission phases. In the routing phase, probe packets will be transmitted and forwarded in the network thus multiple paths are selected and performed based on the constriction of the maximum hop number. In the second phase, the information will be encoded, say, with the fountain codes, and transmitted using the paths generated in the first phase. In such a way, an efficient routing and data transmission mechanism can be built, which allow us to construct a low-cost, flexible and ubiquitous network. Such a networking architecture and data transmission can be used in many M2M communications, such as the stub network of internet of things, and deep space networking, and so on.

• 정보보호학회논문지
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• 제26권6호
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• pp.1571-1582
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• 2016

단방향 전송 기술에서 해결해야 할 이슈들 중에 한 가지는 TCP 기반의 데이터 전송에서 발생하는 패킷 손실을 줄이는 것이다. 잘 알려진 에러 수정 기법들을 활용해서 패킷 손실을 줄일 수 있다. 하지만, 기존의 여러 기법들을 활용한다고 하더라도, 링크 에러와 버퍼 오버플로우에 의한 패킷 손실은 여전히 발생할 수 있다. 본 논문에서는 신뢰성 있는 단방향 데이터 전송 시스템(RED, REliable Data diode)을 제안한다. RED는 기존의 단방향 전송 기술과 마찬가지로 TCP 기반의 데이터 전송을 지원하기 위해 TCP 프록시 기법을 활용한다. RED 송신시스템은 TCP 패킷의 지연 전송을 활용하여 버퍼 오버플로우에 의한 패킷 손실을 줄일수 있다. 또한, RED 송신시스템은 패킷의 중요도 및 여유 자원을 고려하여, RED 수신시스템에게 다수의 동일한 패킷을 복제 및 전송함으로써, 단방향 전송 링크에서의 링크 에러에 의한 패킷 손실을 줄일 수 있다.

• 한국항행학회논문지
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• 제23권4호
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• pp.302-308
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• 2019

항공 데이터 네트워크 (ADN; aircraft data network)는 항공기 항전장비들 간 신호데이터 송수신을 위한 네트워크로써 항공기 운용 환경을 고려해 MIL-STD-1553B와 같이 고신뢰성 프로토콜이 사용되어왔다. 최근에는 고속통신의 필요성이 증가함에 따라 상용 이더넷이 ADN으로 활용되고 있으며, 적용 범위가 증가하고 있는 추세이다. 이더넷은 MIL-STD-1553B 프로토콜에 비해 고속 데이터 전송이 가능하다는 장점이 있지만, 지연시간이 길다는 낮은 단점이 있다. 본 논문에서는 ADN으로 활용되는 이더넷의 성능 향상을 위한 동적 라우팅 기법과 우선순위 기반 데이터 전송기법을 제시한다. 제시기법은 이더넷 스위치에 적용되어 네트워크 트래픽의 효율적 관리 및 고우선순위 데이터 전송시간 단축시킬 수 있다. 본 논문에서는 이더넷 스위치 기반 항공전자 네트워크 환경에서 시뮬레이션을 통해 제시기법이 기존 이더넷에서 사용되는 스패닝 트리 프로토콜에 비해 데이터 전송시간을 단축시킬 수 있음을 입증한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.234-236
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• 2004

Transmission control protocol(TCP) is protocol used in internet. TCP is seldom transmission error and is protocol based on wire environment. TCP uses 3 way handshake ways, data transmission control through windows size, data transmission control through reception confirmation, sliding window for packet delivery. In this study, designed TCP packet ion module for analyze the TCP segments & correct information about TCP. TCP capture in internet using designed TCP module and analysed TCP segments composition. Through this, could analyze the correct information of protocol in network.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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• pp.266-268
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• 2001

As we move to competition, transmission cost become more and more important. At the wholesale competition market, the process of settlement must include the cost of transport. The aim of this paper is to calculate approximate transmission cost at each power sales district office using KEPCO data. We considered investment cost, transmission constraints and marginal losses as cost elements which must be taken into account in transmission cost calculation.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.171-175
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• 1997

We have developed a remote diagnosis system using the LAN and MODEM which enables a routine check for a patient remotely. We used $LabVIEW^{TM}$ as the programing development tool and DAQ (Data Aquisition) board from National Instrument for data aquisition. The LAN card and MODEM are used for the transmission of patient's data. A patient data are aquired by DAQ board and signal processing is done by $LabVIEW^{TM}$, which is a graphical prgamming language. Two methods for the data of transmission. One is the Client-Server model using TCP/IP (Transmission Control Protocol / Internet Address) in the LAN (Local Area Network) Another is using MODEM to transmit the measured data from a patient. In this case, the data transmission is accomplished by the FTP (File Transfer Protocol).

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권9호
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• pp.2213-2231
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• 2013

Compressed sensing is a novel technology used in the field of wireless communication and sensor networks for channel estimation, signal detection, data gathering, network monitoring, and other applications. It plays a significant role in highly secure, real-time, well organized, and cost-effective data communication in smart-grid (SG) systems, which consist of multi-tier network standards that make it challenging to synchronize in power management communication. In this paper, we present a multi-layer communication model for SG systems and propose compressed-sensing based data transmission at every layer of the SG system to improve data transmission performance. Our approach is to utilize the compressed-sensing procedure at every layer in a controlled manner. Simulation results demonstrate that the proposed monitoring devices need less transmission power than conventional systems. Additionally, secure, reliable, and real-time data transmission is possible with the compressed-sensing technique.

• International Journal of Internet, Broadcasting and Communication
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• 제13권3호
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• pp.25-33
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• 2021

Energy-harvesting wireless sensor networks(EH-WSNs) can collect energy from the environment and overcome the technical limitations of existing power. Since the transmission distance in a wireless sensor network is limited, the data are delivered to the destination node through multi-hop routing. In EH-WSNs, the routing protocol should consider the power situations of nodes, which is determined by the remaining power and energy-harvesting rate. In addition, in applications such as environmental monitoring, when there are urgent data, the routing protocol should be able to transmit it stably and quickly. This paper proposes an adaptive routing protocol that satisfies different requirements of normal and urgent data. To extend network lifetime, the proposed routing protocol reduces power imbalance for normal data and also minimizes transmission latency by controlling the transmission power for urgent data. Simulation results show that the proposed adaptive routing can improve network lifetime by mitigating the power imbalance and greatly reduce the transmission delay of urgent data.

• 한국정보기술학회 영문논문지
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• 제10권1호
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• pp.57-69
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• 2020

In general, many IoT devices, including smart phones, use LTE, Wi-Fi, and Bluetooth, and these communication modules generate a lot of energy consumption during periodic data transmission. This paper proposes a method of the data transmission mode change for improving energy efficiency in various communication environments that mobile devices may encounter. We propose an algorithm for setting the mode considering energy efficiency, data transmission performance and cost when the mobile device transmits data, and transmitting the data in an optimized manner according to the state of the mobile device. The proposed algorithm is implemented through experiments on energy efficiency for each communication module, and the scenario is used to verify how efficiently the proposed algorithm uses energy.