• 제목/요약/키워드: Communication System

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전력선 통신 시스템을 위한 머신러닝 기반의 원신호 예측 기법 (Machine Learning-Based Signal Prediction Method for Power Line Communication Systems)

  • 선영규;심이삭;홍승관;김진영
    • 한국위성정보통신학회논문지
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    • 제12권3호
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    • pp.74-79
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    • 2017
  • 본 논문에서는 머신러닝 알고리즘 중 하나인 다층 퍼셉트론을 기반으로 전력선통신 시스템에서의 수신 신호를 이용하여 송신단에서 전송한 원신호를 예측하는 시스템 모델을 제안한다. 전력망을 활용한 통신 방식을 사용하는 전력선통신 시스템은 일반적인 통신설로를 활용하는 통신 방식에 비해 잡음이 많다. 이 때문에 전력선통신 시스템의 성능이 저하가 되는 문제가 발생한다. 이를 해결하기 위해 본 논문에서 제안하는 통신 시스템 모델을 이용하면 원신호 예측을 통해 잡음의 영향이 최소화되어 전력선통신 시스템의 성능저하를 완화시킨다. 본 논문에서는 제안한 통신 시스템 모델을 백색 잡음 환경에 적용하여 시뮬레이션을 해봄으로써 원신호가 예측 되는지를 입증한다.

핸드오프 구조를 갖는 이동통신망에서의 통신 구조 가용도 계정 (Communication Scheme Availability Evaluation for Hand off Scheme in Mobile Communication Networks)

  • 이준혁;오영환
    • 한국신뢰성학회지:신뢰성응용연구
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    • 제8권4호
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    • pp.193-204
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    • 2008
  • In this paper, we proposed availability evaluation of network in mobile communication network that have hand off structure. Radio mobile communication network is essential hand off action to keep communication that is no discontinuance by transfer of terminal. Part by state and hand off state ago hand off by transfer of terminal and communication network is estimated performance according to the hand off rate and hand off completion rate of system. we applied MS, SM, MM communication structure in radio CORBA for network availability evaluate. System availability in mobile communication network that can repair that propose in this study uses the hand off rate and hand off completion rate of system by transfer of terminal and availability of whole system did evaluate.

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4G LTE 기술을 적용한 고속철도 통신/신호 시스템 영향력에 관한 연구 (Study on the Effectiveness of High-Speed Railway Communication and Signaling System Based on 4G LTE Technology)

  • 손연;이창영;한영재;이진
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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    • pp.2795-2803
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    • 2011
  • Due to speed acceleration, higher requirements have been put forward to high speed railway communication and signaling system. The railway applications, including intra-train, train to ground and trackside networks, demand larger bandwidth, higher reliability and shorter response time from railway communication networks to ensure security operation and passenger communication. However, the current railway communication and signaling system has lagged behind the railway development, so advanced communication technologies are needed to improve the current situation. This paper presents high speed railway communication and signaling system based on 4G LTE technology, introduces its network architecture, key technology and analyzes its technical advantages compared with GSM-R system. According to analysis, LTE based high-speed railway communication network is more effective and reliable.

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광전자식 과전류 보호계전기의 구현에 관한 연구 (Implementation of Optoelectric Over Current Relay)

  • 박병석;오면택;이화준;조홍근
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1998년도 하계학술대회 논문집 E
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    • pp.1846-1849
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    • 1998
  • An optical magnetic filed sensor, YIG (Yittrium Iron Garnet), response rapidly, to the power-line currents to be measured. In response to Faraday effect, it shows wide-and-linear measurable range. This paper reports the development and implementation of an OOCR (Optoelectric OverCurrent Relay) using this sensor. This relay is free from environmental electro-magnetic noises and has excellent insulation characteristics inherently. By using this OOCR, we can reduce insulation cost of protective relaying systems and its maintenance cost, and can achieve high reliability of the system.

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LVDC 배전계통의 접지방식에 따른 인체안전 및 계통영향 분석 (Analysis of Human Safety and System Effect according to Grounding Scheme in LVDC Distribution System)

  • 오윤식;한준;권기현;김두웅;노철호;정택현;김철환
    • 전기학회논문지
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    • 제63권5호
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    • pp.608-614
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    • 2014
  • Recent developments and trends in the electric power consumption clearly indicate an increasing use of DC in end-user equipment. According to the trends, new DC power distribution systems have been researched and developed although we presently enjoy a predominantly AC power distribution system. We can use various grounding schemes in DC distribution system as well as in AC distribution system to protect human body and equipments. However, we need to evaluate carefully which grounding scheme is appropriate for a specific system before applying those schemes. In this paper, we analyze the human safety and system effect according to various grounding schemes in Low Voltage DC (LVDC) distribution system. Some components in LVDC distribution system are modeled and computer simulations are conducted by using ElectroMagnetic Transient Program (EMTP).

스마트 가로등 시스템의 전력선통신 필터 성능 개선 및 효율 평가 (PLC Filter Capacity Improvement and Efficiency Evaluation of Smart Street Lighting System)

  • 김명호
    • 전기학회논문지P
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    • 제58권2호
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    • pp.154-157
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    • 2009
  • In order to give handiness to the management of the existing street lighting system which is based on the one way communication and to reduce the maintenance cost, the power line communication filter in the two way communication which is based on the CDMA communication and power line communication was improved and accordingly the stability of the communication performance was improved. Also, the efficiency of existing street lighting system and smart street lighting system was evaluated as Visual studio system. As a result, when the number of street lights is 10,000, the hours of daily work fell 50% and the number of necessary maintenance staff decreased 40%. Compared to the maintenance costs of the existing street lighting system, it could be expected to have the cut costs of almost 100 million won a year on the basis of 60 switch board and 1,200 street lights.

A Knowledge-based Network Management System Using Active Information Resources

  • Kinoshita, Tetsuo;Kitagata, Gen;Takahashi, Hideyuki;Sasai, Kazuto;Kalegele, Khamisi
    • International journal of advanced smart convergence
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    • 제3권1호
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    • pp.1-6
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    • 2014
  • An expert network administrator is not always stationed as disasters happen. In that case, it is desirable that a novice administrator is capable of taking part in network recovery operations as well. In this paper, aknowledge-based network management system in emergency situations is presented. We use the Active Information Resource based Network Management System (AIR-NMS) to relieve the human administrator from parts of her management tasks and present an interface that remotely can control this management system. The effectiveness of the system is demonstrated by experiments using a prototype system.

무선통신시스템 활용을 위한 원자력발전소 EMC 확보방안에 관한 연구 (A Study on the EMC for Application of Wireless Communication System in Nuclear Power Plants)

  • 고도영;배병환
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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    • pp.500-502
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    • 2006
  • Recently, nuclear power plants have been testing for application of wireless communication system to improve communication easier. Improving the availability of communication in NPPs, plant operation ability and good communication have contributed to the lower reactior trip frequency. In these regards, the possibilities of improvement in communication systems are reviewed detail. Especially, we reviewed the wire communication system, facility effect, regulation and new technologies. In this paper, we described the application of wireless in NPPs by studying EMI/RFI, EMC effect.

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LoRa WAN 통신 기반의 선박 내/외부 승선자 측위 및 위험상황 감지 시스템 (Measuring Inner or Outer Position of Ship Passenger and Detection of Dangerous Situations based LoRa WAN Communication)

  • 박석현;박문수
    • 한국멀티미디어학회논문지
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    • 제23권2호
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    • pp.282-292
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    • 2020
  • In order to minimize casualties from marine vessel accidents that occur frequently at home and abroad, it is important to ensure the safety of the passengers aboard the vessel in the event of an accident. There is an EPIRB system as a system for disaster preparedness in the marine situation currently on the market, but there is a problem that the price is very expensive. In order to overcome the cost problem, which is a disadvantage of previous system, LoRaWAN-based communication is used. LoRaWAN communication-based vessel positioning and risk detection system based on LoRaWAN communication transmits measurement data of each module using two Beacon and GPS modules to stably perform position measurement for both indoor and outdoor situations. The rider danger situation detection system can detect the safety status of the rider using the 3-axis acceleration sensor, collect data from the rider positioning system and the rider safety status detection system, and send to server using LoRa communication. When conducting communication experiments in the long-distance maritime situation and actual communication experiments using the implemented system, it was found that the two experiments showed over 90% communication success rate on average.

Performance Optimization and Analysis on P2P Mobile Communication Systems Accelerated by MEC Servers

  • Liang, Xuesong;Wu, Yongpeng;Huang, Yujin;Ng, Derrick Wing Kwan;Li, Pei;Yao, Yingbiao
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제16권1호
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    • pp.188-210
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    • 2022
  • As a promising technique to support tremendous numbers of Internet of Things devices and a variety of applications efficiently, mobile edge computing (MEC) has attracted extensive studies recently. In this paper, we consider a MEC-assisted peer-to-peer (P2P) mobile communication system where MEC servers are deployed at access points to accelerate the communication process between mobile terminals. To capture the tradeoff between the time delay and the energy consumption of the system, a cost function is introduced to facilitate the optimization of the computation and communication resources. The formulated optimization problem is non-convex and is tackled by an iterative block coordinate descent algorithm that decouples the original optimization problem into two subproblems and alternately optimizes the computation and communication resources. Moreover, the MEC-assisted P2P communication system is compared with the conventional P2P communication system, then a condition is provided in closed-form expression when the MEC-assisted P2P communication system performs better. Simulation results show that the advantage of this system is enhanced when the computing capability of the receiver increases whereas it is reduced when the computing capability of the transmitter increases. In addition, the performance of this system is significantly improved when the signal-to-noise ratio of hop-1 exceeds that of hop-2.