• Title, Summary, Keyword: Communication Zone

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A Study on Safe School Zone System using LabVIEW

  • Kim, Kyung-Hwa;Shim, Joon-Hwan
    • Journal of Engineering Education Research
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    • v.13 no.5
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    • pp.20-24
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    • 2010
  • The total number of deaths by traffic accidents is decreasing every year in our country. However, in 2009, children died in traffic accidents at a rate of 2.3 deaths per 100,000 children, which was higher than the average of OECD countries (1.9 deaths per 100,000 children). In particular, traffic accidents are showing rapid increase in school zone during the past 2 years because of problems in the designation and management of school zone. Traffic safety facilities such as road sign, reflector mirror, speed bump have the ultimate limit of vehicle accidents prevention. Thus, in school zone, children safety is still not guaranteed due to illegal parking and the absence of driver's awareness of safety. Therefore, In order to protect children from traffic accidents within school zones, we have realized a safe school zone system, which enables the drivers to better know the intended school zones and creates pedestrian environment through unmanned monitoring camera, using LabVIEW.

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The iZone System for Safety Walking of Children (어린이의 안전한 보행을 위한 iZone 시스템)

  • Min, Seonghee;Oh, Yoosoo
    • Journal of Korea Multimedia Society
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    • v.22 no.1
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    • pp.62-69
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    • 2019
  • In this paper, we propose iZone system for safe walking of children. The proposed system recognizes the state that a child is down a roadway as a dangerous situation. And then it informs the surrounding adults and guardians of the child in the event of a dangerous situation. The iZone system consists of the iZone device that attaches to a child's bag or clothing, the iZone app for children, the iZone server, and external beacons. The proposed system uses the ultrasonic sensor of the iZone device and the GPS coordinates and external beacons information by the children's smartphone to determine the dangerous situation. The proposed system uses external beacons to calibrate the GPS coordinates. Moreover, it determines whether the child is down the roadway in sidewalk by measuring the height difference between the roadway and the sidewalk using ultrasonic sensor.

Modeling and Performance Analysis of Zone-Based Registration Considering Cell by Cell Expansion of Location Area (셀 단위로 증가하는 위치영역을 고려한 영역기준 위치등록의 모형화 및 성능 분석)

  • 김경희;백장현;정호연
    • Journal of the Korean Operations Research and Management Science Society
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    • v.28 no.3
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    • pp.67-79
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    • 2003
  • An efficient mobility management for mobile stations plays an important role in mobile communication networks. Even though many a mobility management schemes have been proposed, most of mobile communication networks adopt the mobility scheme based on zone-based registration. This paper studies the mobility management scheme that combines zone-based registration and 2-step selective paging. We assume cell by cell registration area, not ring by ring registration area of previous studies, and set up a new mobility model based on 2-dimensional random walk model considering the characteristic of zone-based registration to evaluate its performance exactly. We provide numerical results using proposed model to demonstrate the performance of zone-based registration and 2-step selective paging under various circumstances.

Modeling and Performance Analysis of Zone-Based Registration for Next Generation Mobile Communication Network (차세대 이동통신망을 위한 영역기준 위치등록의 모형화 및 성능 분석)

  • Kim, Dong-Hoi;Baek, Jang-Hyun
    • Journal of Korean Institute of Industrial Engineers
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    • v.29 no.4
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    • pp.292-303
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    • 2003
  • An efficient mobility management for mobile stations plays an important role in mobile communication network. Two basic operations of mobility management are location registration and paging. A zone-based registration (ZBR) is implemented in most of mobile communication systems and we consider the mobility management scheme that combines a zone-based registration and a selective paging (SP). We propose new analytical model that can reflect on the characteristics of the ZBR based on 2-dimensional random walk mobility model and more efficient paging schemes considering the proposed model. We evaluate the performance of the mobility management scheme with our mobility model to determine the optimal size of location area that will result in the minimum signaling traffic on radio channels. Numerical results are provided to demonstrate that our mobility model is useful to evaluate the ZBR more exactly.

The Self-Fault Determination and Restoration Methodology based on the Ethernet Communication (이더넷 통신기반의 자율적 고장 판단 및 복구 방법론 연구)

  • Ko, Yun-Seok;Lee, Seo-Han;Choi, Hyun-Chul;Shin, Jae-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.9
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    • pp.1674-1680
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    • 2009
  • This paper proposes an autonomous fault determination, fault zone isolation and fault restoration strategy based on the ethernet communication as a new attempt to solve the problem the of the existing central control method. In proposed method, The FRTU(Feeder Remote Terminal Unit)s on the feeder determines autonomously where the faulted zone is by exchanging the voltage and current information with neighbor FRTUs based on the network communication, and then separates the faulted zone in an nil-voltage status to make the protective device to reclose successively. In particular, the minimization of outage time and relational load balancing is archived by each interconnection switch which determines autonomously the load zone to be allocated among those zones after the sound outage zones was separated individually. Finally, to show effectiveness of the proposed fault restoration strategy, the several fault cases are simulated for the test distribution system, and the load balancing index of the proposed solution is compared with all of feasible solutions.

Implement for Addiction Patient-Care System based on Status-Information Recognition in Ubiquitous-Zone (u-Zone에서 상태정보 감지를 통한 중독환자 케어 시스템 구현)

  • Lim, Myung-Jae;Lee, Seung-Ho;Lee, Ki-Young;Choi, Mi-Lim
    • The Journal of The Institute of Internet, Broadcasting and Communication
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    • v.10 no.2
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    • pp.123-128
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    • 2010
  • ularly, a points of view Health-care system, it can reduce costs and efforts in order to management of patients. However, Health-care system keep a level of service for person and extends of hospital inner parts system. Although the rate of an addict grow by alcoholic but it is difficult to manage and diagnosis because of patient data gathering. Therefore in this thesis, it is proposed to patient data gathering and monitering method in u-zone. It can collect patient data by pulse, temperature and acceleration sensor and it can diagnosis correct based on emotion change data.

A Study on DNS sinkhole operation using DNS Response Policy Zone (DNS Response Policy Zone 을 이용한 DNS 싱크홀 운영 방안 연구)

  • Chio, Jae-Young;Oh, Sang-Seok;Min, Sung-Gi
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1528-1531
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    • 2011
  • 최근 악성봇은 해커에 의해 원격 조정되어 명령에 의해 스팸메일 발송, DDoS 공격 등의 악성행위를 수행하는 웜/바이러스이다[2]. 악성봇은 이전의 웜/바이러스와 달리 금전적인 이득을 목적으로 하는 것이 많아 작게는 일상생활의 불편함으로부터 크게는 사회적, 국가적으로 악영향을 주고 있다. 국내에서는 이러한 위험을 방어하기 위한 효과적인 대응 방법으로 DNS 싱크홀을 운영 하고 있다. 본 논문에서는 DNS 싱크홀 운영 중 수집한 봇 명령/제어 (Command and Control, C&C) 도메인을 Internet Service Provider (ISP) DNS 싱크홀 시스템에 적용하는 과정에서 나타나는 문제점을 효과적으로 해결 하기 위한 DNS Response Policy Zone(RPZ)을 이용한 DNS 싱크홀 운영 방안을 제시 하였다.

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Compensation PWM Technique for Extended Output Voltage Range in Three-Phase VSI Using Three Shunt Resistors

  • Shin, Seung-Min;Park, Rae-Kwan;Lee, Byoung-Kuk
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1324-1331
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    • 2014
  • This paper proposes a compensation PWM technique for the extension of output voltage ranges in three-phase VSI applications using three shunt resistors. The proposed technique aims to solve the dead zone, which occurs in high modulation indexes. In the dead zone, two phase currents cannot be sampled correctly, so that the three-phase VSI cannot be operated up to the maximum output voltage. The dead zone is analyzed in detail, and the compensation PWM algorithm is developed. The proposed algorithm is verified by numerical analysis and experimental results.

Performance Evaluation of Zone-based Registration in COMA Mobile Communication System (CDMA 이동통신 시스템에서 영역기준 위치등록 방법의 성능분석)

  • Baek, Jang-Hyun;Lie, Chang-Hoon
    • Journal of Korean Institute of Industrial Engineers
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    • v.22 no.4
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    • pp.689-703
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    • 1996
  • In this paper, we evaluate the performance of zone-based registration. First, we propose a mobility function for single zone-based registration. And we establish the circumstances of multiple zone-based registration, which is based on the mobility function for single zone-based registration, and perform simulation programs for the circumstances. Using the simulation results, we obtain optimal N, the number of multiple zones which minimizes signalling traffic in radio channels. Results show that in most cases optimal N is 2. Multiple zone-based registration has less signalling traffic in radio channels than single zone-based registration and zone-based registration must be implemented as multiple zone-based registration.

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