• Title/Summary/Keyword: 통신장애

Search Result 901, Processing Time 0.036 seconds

포항·광주 로란-C 시간동기시스템 구축 결과

  • Kim, Yong-Seok;Seol, Gwang-Cheol
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • 2019.11a
    • /
    • pp.77-80
    • /
    • 2019
  • GPS 항법 시스템은 재밍(jamming)에 취약한 것으로 알려져 있다. 실제로 2010년부터 북한은 서해상과 수도권에 GPS 전파교란 공격을 감행, 운행 중이던 선박과 항공기의 네비게이션 등에 다수의 장애현상을 유발시켰다. 이것에 대한 대안으로 eLoran(enhanced Long Range Navigation)이 GPS 항법 시스템을 보완할 수 있다고 알려져 있다. 이에 따라 해양수산부(MOF)는 기존 포항·광주 로란-C 송신국에 UTC(Coordinated Universal Time) 기반의 시각동기시스템 구축하여 지상파 eLoran 시스템으로 활용하기 위한 eLoran 사업을 진행하고 있다. 본 논문에서는 기존 포항·광주 로란-C 송신국에 UTC(Coordinated Universal Time) 기반의 시각동기시스템을 구축하기 위한 요구 사항을 살펴보고, 이 요구 사항에 따른 포항·광주 로란-C 시각동기시스템의 구축 결과에 대해 기술하였다.

  • PDF

The Relationship between Voice Recognition Games and Education: Current Research Trends and Future Perspectives (음성인식 게임과 교육의 연관성: 현재 연구 동향과 전망)

  • Se Jeong Heo;Sung Jin Kim;Young Hyun Yoon;Jai Soon Baek
    • Proceedings of the Korean Society of Computer Information Conference
    • /
    • 2023.07a
    • /
    • pp.397-398
    • /
    • 2023
  • 본 논문은 음성인식 기술을 활용한 게임과 교육 분야의 연계성에 대한 연구를 제시한다. 음성인식 게임은 사용자의 음성 명령을 인식하고 상호작용을 가능하게 함으로써 학습자의 참여와 흥미를 유발한다. 관련 연구들은 음성인식 게임이 언어 학습, 수학 학습, 학습 장애 학생 지원 등 다양한 교육 분야에서 효과적으로 활용될 수 있다는 것을 보여준다. 음성인식 게임은 교육 환경에서의 음성인식 기술의 잠재력을 제시하며, 추가 연구가 필요하다는 결론을 도출한다.

  • PDF

Performance Evaluation of Reed-Solomon Encoded Block Recovery in Open Source Blockchain Environments (오픈소스 블록체인 환경에서 리드 솔로몬 부호화 된 블록의 복구 성능 평가)

  • Seong-Hyeon Lee;Myungcheol Lee
    • Annual Conference of KIPS
    • /
    • 2023.11a
    • /
    • pp.250-251
    • /
    • 2023
  • 블록체인 원장의 용량이 폭증하면서 여러 확장성 문제들이 나타나고 있다. 이에 대한 해결 방법으로 원장에 Reed-Solomon 부호화를 적용하여 용량을 줄이려는 연구가 일부 진행 중이나, 피어에 장애가 발생하거나 악의적 행동이 있다면, 데이터 손실을 막기 위한 복구 과정이 필수적이다. 본 논문에서는 원장에 Reed-Solomon 부호화를 적용해 얻는 저장 공간의 감소 효과에 비해서 데이터를 복구할 시 어느 정도의 오버헤드가 발생하는지 성능 평가를 수행했다. 결과적으로, 많은 블록 복구가 필요한 상황에서 인코딩/디코딩 시간은 미미하였고, 대부분의 오버헤드는 청크 재전송 시간이었다.

Relay Protocol in DSRC System (DSRC 시스템에서 릴레이 프로토콜)

  • Choi Kwang-Joo;Choi Kyung-Won;Cho Kyong-Kuk;Yoon Dong-Weon;Park Sang-Kyu
    • Journal of the Institute of Electronics Engineers of Korea TC
    • /
    • v.43 no.9 s.351
    • /
    • pp.32-39
    • /
    • 2006
  • 5.8GHz DSRC(Dedicated Short Range Communications) is a short to medium range communications service that supports both public safety and private operations in roadside to vehicle and vehicle communication. However the 5.8GHz frequency may cause the shadowing effect or communication blocking problem when there is an obstacle or another vehicle between RSE (Road Side Equipment) and OBE (On Board Equipment). In this paper, to solve this problem of the 5.8GHz DSRC, we propose a relay protocol based on the standard of DSRC radio communication between RSE and OBE in the 5.8GHz band made by TTA (Telecommunication Technology Association). By using the proposed relay protocol to DSRC system and intervehicle communication, we also consider a fixed relay protocol and mobile relay protocol. We expect to apply this relay protocol for the DSRC intervehicle communication and video communication between drivers and safe distance among vehicles in the near future.

A Study on Linkage Integration Control System Using Power Line Communication(PLC) and Wireless Sensor Network(WSN) (전력선 통신과 무선 센서 네트워크 기술을 이용한 연동 통합제어 시스템에 관한 연구)

  • Ji, Yun-il;Lim, Kang-il;Park, Kyung-sub
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2009.05a
    • /
    • pp.733-736
    • /
    • 2009
  • Power Line Communication(PLC) is need not additional communication line. So establishment expense is inexpensive and application is simple. Therefore, lower part network of various application field is possible. However, there are high subordinate interference and noise problem on limited transmission data and communication interference element. Wireless Sensor Network(WSN) is need not infrastructure, Self-regulating network architecture of sensor nodes is possible. So at short time, network construction is available. But, power consumption is increased by active sensing for QoS elevation and unnecessary information transmission, low electric power design and necessity of improve protocol are refered to life shortening problem and is studied. In this paper, supplement problem of power line communication and wireless sensor network mutually and because advantage becomes linkage integration control system using synergy effect of two technologies as more restriction be and tries to approach structurally control network that is improved for smooth network environment construction. Honeywell's hybrid sensor network does comparative analysis(benchmarking). Confirm performance elevation proposing teaming of power line communication and wireless sensor network. Through simulation, service delay decreases and confirms that performance elevation.

  • PDF

Comparative Research on Global Policy in ICT Accessibility for Vulnerable Groups -Focusing on Implementation of Legislative System- (취약계층을 위한 정보통신 접근성 정책에 대한 국가 간 비교 연구 -관련제도 중심으로-)

  • Kim, Jung-Yeon;Park, Sung-Woo;Kang, Byung-Gwon;Son, Chang-Yong;Jung, Bong-Keun
    • 재활복지
    • /
    • v.20 no.1
    • /
    • pp.131-150
    • /
    • 2016
  • This study aims to compare global policies on ICT accessibility and to suggest possible solutions that help to enhance ICT accessibility for socially disadvantaged groups. The results indicated that related laws and standards in Korea are relatively well established than Asian countries' whereas they need improvements when compared to the US or the UK. Particularly, in spite of rapid development in information communication technology industry, incorporating the definition of newly developed technologies into existing laws related to ICT accessibility seemed slow that caused reluctancy of related parties to address accessibility issues the new technologies create. In addition, Korean government seems less effortful to develop policies and standards apart from web and mobile application accessibility. In order to resolve the problems, firstly, the period or process of enacting and amending laws can be shorten. Next, a government affiliated research institute can be established to do research and develop ICT accessibility related to user scenarios so that effective policies and standards could be readily provided. Even though other possible solutions can be suggested, what is more important than that is that any interested parties should sustainably make efforts to provide equal opportunities for the underserved populations.

A study on the reliability and availability improvement of wireless communication in the LTE-R (철도통합무선망(LTE-R) 환경에서 무선통신 안정성과 가용성 향상을 위한 방안 연구)

  • Choi, Min-Suk;Oh, Sang-Chul;Lee, Sook-Jin;Yoon, Byung-Sik;Kim, Dong-Joon;Sung, Dong-Il
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.24 no.9
    • /
    • pp.1172-1179
    • /
    • 2020
  • With the establishment of the railway integrated radio network (LTE-R) environment, radio-based train control transmission and reception and various forms of service are provided. The smooth delivery of these services requires improved performance in a highly reliable and available wireless environment. This paper measured the LTE-R radio communication environment to improve radio communication performance of railway integrated wireless network reliability and availability, analyzed the results, and established the wireless environment model. Based on the built-up model, we also proposed an improved radio-access algorithm to control trains for improved reliability, suggesting a way to improve stability for handover that occur during open-air operation, and proposed an algorithm for frequency auto-heating to improve availability. For simulation, data were collected from the Korea Rail Network Authority (Daejeon), Manjong-Gangneung KTX route, which can measure the actual data of LTE-R wireless environment, and the results of the simulation show performance improvement through algorithm.

Multi-Path Virtual Network Resource Allocation with Shared Backup Bandwidth (공유 백업 대역폭을 갖는 다중 경로 지원 가상 네트워크 자원 할당 방안)

  • Kim, Hak Suh;Lee, Sang-Ho
    • Journal of Convergence Society for SMB
    • /
    • v.6 no.4
    • /
    • pp.17-23
    • /
    • 2016
  • With the advance of ICT, the Internet has been creating new services in various fields. However, due to the architectural problem of the Internet, it may inhibit the development of network architectures and various services. Network virtualization is being investigated as an alternative to overcome the architectural problem of the Internet and a virtual network resource allocation algorithm is a very important issue. In this paper, we propose a multiple path resource allocation algorithm with shared backup bandwidth in order to overcome single link failure. It will be improved survivability of the virtual networks. Through our experiments, we confirmed that the multi-path creation time of the proposed algorithm has about 50% performance improvement than previous works.

A Computer Access System for the Physically Disabled Using Eye-Tracking and Speech Recognition (아이트래킹 및 음성인식 기술을 활용한 지체장애인 컴퓨터 접근 시스템)

  • Kwak, Seongeun;Kim, Isaac;Sim, Debora;Lee, Seung Hwan;Hwang, Sung Soo
    • Journal of the HCI Society of Korea
    • /
    • v.12 no.4
    • /
    • pp.5-15
    • /
    • 2017
  • Alternative computer access devices are one of the ways for the physically disabled to meet their desire to participate in social activities. Most of these devices provide access to computers by using their feet or heads. However, it is not easy to control the mouse by using their feet, head, etc. with physical disabilities. In this paper, we propose a computer access system for the physically disabled. The proposed system can move the mouse only by the user's gaze using the eye-tracking technology. The mouse can be clicked through the external button which is relatively easy to press, and the character can be inputted easily and quickly through the voice recognition. It also provides detailed functions such as mouse right-click, double-click, drag function, on-screen keyboard function, internet function, scroll function, etc.

A Situational Training System based on Augmented Reality for Developmentally Disabled People (발달 장애인을 위한 증강현실 기반 상황훈련 시스템)

  • Choi, Jae-In;Kim, Kyung-Rae;Kim, Tae-Young
    • Journal of Korea Multimedia Society
    • /
    • v.16 no.5
    • /
    • pp.629-636
    • /
    • 2013
  • Nowadays, many interface devices or training systems have been developed with recent developments in IT technology but only a few training systems for developmentally disabled people have been introduced. In this paper, we present a real-time, interactional and situational training system based on augmented reality in order to improve cognitive capability and adaptive ability in the daily life of developmentally disabled people. Our system is specifically based on serving food in restaurants. This augmented reality based system provides them to experience various different situations safely and take the training session as much as they want under any circumstances. When they use our system, they are able to look around with Head Mounted Display(HMD) and take training sessions easily based on various situational scenarios. After experimenting on our system for 3 months, we found they had no aversion about wearing HMD and learned quicker as they practiced over and over and improved their cognitive capability and adaptive ability. We also got a positive feedback that it had an excellent educational value from teachers in special-education-school.