• Title/Summary/Keyword: wireless control network

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Decision Making for the Industrial Security Management Measures' Importance in Operation Level (운영 수준에서의 산업보안 관리대책 중요도 결정)

  • Chae, Jeong-Woo;Jeong, Jin-Hong
    • The Journal of the Korea Contents Association
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    • v.13 no.4
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    • pp.389-398
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    • 2013
  • This study aims to support rational security investment decision making through prioritizing on operational level of management measures strategically, in carrying out industrial security activities. For this, AHP survey is conducted against industrial security professionals and analyzed. Thereafter, the importance and the priority of industrial security management measures are determined. As a result, in a comparison evaluation among the criteria, 'ICT service management' represents the highest weight (0.54). And the sub-criteria could be divided into three groups (Group I, II, III), depending on their importance. The sensitivity analysis results show that if the weight of the criterion, 'ICT systems/networks access control' is doubled, the sub-criteria, 'O/S access control', 'application access control', and 'wired/wireless network access control' are enter into top rank group. In case of the criterion, 'physical/environmental security' is doubled, the sub-criteria, 'protection zoning/access control' and 'disaster prevention on business equipment/counter-terrorism' are enter into the top rank group, 'securing utilities' is enter into the mid rank group.

LED Lighting Monitoring System Using Bluetooth BLE (Bluetooth BLE를 활용한 LED 조명 관제시스템에 관한 연구)

  • Oh, Am-suk
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.2
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    • pp.367-372
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    • 2017
  • LED illumination has been developed from simple illumination to human oriented multi-functional system depending on the IT convergence trends. Thus, the convergence of IT technology such as various types of sensor and communication functions with application software can make saving of energy, and there are also several needs about the tailor-made illuminations requirements for the diverse users who want to take their own colors, strengths of the light. For the adaption of these kinds of intelligent system illumination, user oriented sensor and control should be possible. The LED lighting control system transmits and receives data via the Bluetooth mesh network and provides functions such as LED lighting control, LED lighting condition monitoring, energy usage monitoring, and energy peak point management. Therefore, in this paper, we suggest wireless communication platform and control system for the LED illumination control. We can expect life extension of LED illumination, and energy saving through this suggested system.

A Study on Design of Safety Transmission Unit for Next-Generation Train Control System (차세대 열차제어시스템 안전전송장치 설계에 관한 연구)

  • Tae-Woon Jung;Ho-Cheol Choo;Chae-Joo Moon
    • The Journal of the Korea institute of electronic communication sciences
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    • v.18 no.4
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    • pp.563-570
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    • 2023
  • The Safety Transmission Unit(STU) is a critical device used in railway systems to ensure safe and efficient operations by providing communication between trains and railway infrastructure. It is responsible for transmitting vital information and commands, allowing for the control and coordination of train movements. The STU plays a crucial role in maintaining the safety of passengers, crew, and the overall railway network. This paper presents the design and testing of a STU for the next-generation wireless-based train control system. An analysis of european and domestic standards was conducted to review requirements and ensure the design of a STU for the train control system meets international standards. Based on this analysis, hardware and software designs were developed to create an internationally recognized level of safety for the communication device. To verify the functionality of the STU, a simulator was developed, and it was confirmed that the designed features were successfully implemented.

An Effective Hotspot Cell Management Scheme Using Adaptive Handover Time in 4G Mobile Networks (4G 이동 망에서 적응적 핸드오버 시간을 활용한 효과적인 핫스팟 셀 관리 기법)

  • Kim Dong-Wook;Lee Han-Jin;Jeon Seung-Woo;Sawhney Mrinalini;Yoon Hyun-Soo
    • Proceedings of the Korean Information Science Society Conference
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    • 2006.06d
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    • pp.217-219
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    • 2006
  • 4G mobile networks are expected to support various multimedia services over IP networks and also satisfy high spectral efficiency requirement. In cellular systems including 4G networks, hotspot cells can occur when available wireless resources at some location are not enough to sustain the needs of users. The hotspot cell can potentially lead to blocked and dropped calls, which can deteriorate the service quality for users. In a 4G mobile network, a band of users enjoying multimedia services can move around, which may generate heavy flows of traffic load. This situation can generate the hotspot cell which has a short life span of only a few minutes. In this paper, we propose a handover-based scheme which can effectively manage hotspot cells in 4G mobile networks. With the scheme, the current serving cell can recognize the load status of the target cell in advance before handover execution. Adaptive handover time control according to the amount of traffic load of cells can effectively and flexibly manage the hotspot cell in the network. And, through our hotspot cell management scheme, acceptable service quality can be supported as users continuously maintain connections with the network. In the simulation results, we find that our scheme generates smaller number of hotspot cells and supports higher service quality than the compared schemes.

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Performance Analysis of IEEE 802.15.4e Time Slotted Channel Hopping for Low-Rate Wireless Networks

  • Chen, Shuguang;Sun, Tingting;Yuan, Jingjing;Geng, Xiaoyan;Li, Changle;Ullah, Sana;Alnuem, Mohammed Abdullah
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.7 no.1
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    • pp.1-21
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    • 2013
  • The release of IEEE 802.15.4e specification significantly develops IEEE 802.15.4. The most inspiring improvement is the enhancement for medium access control (MAC) sublayer. To study the performance of IEEE 802.15.4e MAC, in this paper we first present an overview of IEEE 802.15.4e and introduce three MAC mechanisms in IEEE 802.15.4e. And the major concern here is the Time Slotted Channel Hopping (TSCH) mode that provides deterministic access and increases network capacity. Then a detailed analytical Markov chain model for TSCH carrier sense multiple access with collision avoidance (CSMA-CA) is presented. Expressions which cover most of the crucial issues in performance analysis such as the packet loss rate, energy consumption, normalized throughput, and average access delay are presented. Finally the performance evaluation for the TSCH mode is given and we make a comprehensive comparison with unslotted CSMA-CA in non-beacon enabled mode of IEEE 802.15.4. It can validate IEEE 802.15.4e network can provide low energy consumption, deterministic access and increase network capacity.

A Study on Re-design of Quality Requirements for Disaster Communication Systems (재난통신 체계에 따른 품질요건 재설계에 관한 연구)

  • Yang, Jung-Mo;Kim, Jeong-Ho
    • Journal of Digital Convergence
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    • v.13 no.10
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    • pp.327-335
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    • 2015
  • Wireless mesh networks for public safety and disaster have been developing in a direction from TETRA(TErrestrial Trunked RAdio) to take advantage of the Public Safety-LTE(Long Term Evolution) technology. In Korea, the Disaster Safety Network Building Project has been promoted in order to unify disaster communication systems among disaster response agencies. In this study, the trends of the network construction for national disaster communication and corresponding representative cases of overseas have been analyzed. Through this process, the disaster communication area in line with the purpose of communications. As a result, the disaster communication can be divided into five distinctive areas: the control, the response, the on-site, the victim and the alarm communications. Based on the re-designed communication areas, quality requirements have also been re-organized in this study. Ultimately the construction method for the Disaster Communication systems without exclusion zone will be presented.

Throughput and Delay of Single-Hop and Two-Hop Aeronautical Communication Networks

  • Wang, Yufeng;Erturk, Mustafa Cenk;Liu, Jinxing;Ra, In-ho;Sankar, Ravi;Morgera, Salvatore
    • Journal of Communications and Networks
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    • v.17 no.1
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    • pp.58-66
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    • 2015
  • Aeronautical communication networks (ACN) is an emerging concept in which aeronautical stations (AS) are considered as a part of multi-tier network for the future wireless communication system. An AS could be a commercial plane, helicopter, or any other low orbit station, i.e., Unmanned air vehicle, high altitude platform. The goal of ACN is to provide high throughput and cost effective communication network for aeronautical applications (i.e., Air traffic control (ATC), air traffic management (ATM) communications, and commercial in-flight Internet activities), and terrestrial networks by using aeronautical platforms as a backbone. In this paper, we investigate the issues about connectivity, throughput, and delay in ACN. First, topology of ACN is presented as a simple mobile ad hoc network and connectivity analysis is provided. Then, by using information obtained from connectivity analysis, we investigate two communication models, i.e., single-hop and two-hop, in which each source AS is communicating with its destination AS with or without the help of intermediate relay AS, respectively. In our throughput analysis, we use the method of finding the maximum number of concurrent successful transmissions to derive ACN throughput upper bounds for the two communication models. We conclude that the two-hop model achieves greater throughput scaling than the single-hop model for ACN and multi-hop models cannot achieve better throughput scaling than two-hop model. Furthermore, since delay issue is more salient in two-hop communication, we characterize the delay performance and derive the closed-form average end-to-end delay for the two-hop model. Finally, computer simulations are performed and it is shown that ACN is robust in terms of throughput and delay performances.

Time Switching-based Analog Network Coding for Maximizing the Minimum Required Secrecy Capacity in Energy Harvesting Networks (에너지 하베스팅 네트워크에서 최소 요구 보안 용량을 최대화하기 위한 시간 전환 기반의 아날로그 네트워크 코딩)

  • Lee, Kisong;Choi, Hyun-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.11
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    • pp.2022-2028
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    • 2017
  • Recently, the energy shortage of sensors and the leakage of private information are considered as serious problems as the number of sensors is increasing due to the technological advance in Internet-of-Things. RF energy harvesting, in which sensors collect energy from external RF signals, and physical layer security become increasingly important to solve these problems. In this paper, we propose a time switching-based network analog coding for improving information security in wireless networks where the relay can harvest energy from source signals. We formulate 2-hop relay networks where an eavesdropper tries to overhear source signals, and find an optimal time switching ratio for maximizing the minimum required secrecy capacity using mathematical analysis. Through simulations under various environments, it is shown that the proposed scheme improves the minimum required secrecy capacity significantly, compared to the conventional scheme.

An Enhanced Fast Handover Scheme for Real-Time Traffic in IPv6 Based WiBro Network (IPv6기반 와이브로 시스템에서 실시간 트래픽을 위한 개선된 빠른 핸드오버 방안)

  • Jeong, Seok-Jong;Lee, Sung-Kuen;Park, Jin-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.4A
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    • pp.377-386
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    • 2008
  • In this paper, a new handover management scheme has been proposed to reduce handover latency and to support fast handover without packet losses, so that it may be applicable to the wireless mobile Internet system such as IPv6-based WiBro system. To minimize the handover latency in processing of movement detection, we propose the handover management scheme which simplifies the handover message exchanging procedure between mobile subscriber station (MSS) and network by integrating layer 2 and layer 3 handovers efficiently based on the layer2 information. To reduce the processing delay from new care-of-address (NCoA) configuration during handover, we propose that NCoA is created, distributed and managed by new access control router (NACR). In addition, in order to minimize the packet transmission delay and eliminate the packet losses, the proposed scheme employs a crossover router (CR) which is upper network located over PACR and NACR and employs the packet buffering for MSS. The simulation study shows that the proposed scheme achieves loss-free packet delivery and low latency in the environment of narrow overlapped cell area or high velocity of the MSS, comparing the performance with the conventional schemes.

Development of Agriculture Environment Monitoring System Using Integrated Sensor Module (통합 센서 모듈을 이용한 농업 환경 모니터링 시스템 개발)

  • Lee, Eun-Jin;Lee, Kwoun-Ig;Kim, Heung-Soo;Kang, Bong-Soo
    • The Journal of the Korea Contents Association
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    • v.10 no.2
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    • pp.63-71
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    • 2010
  • In this paper, we propose the Agricultural Environment Monitoring System based on Sensor Network which can collect information of crop cultivation environment and monitor it in real-time by using various environment sensors. Existing wireless sensor nodes, based on the sensor network, require extra conversion/control module depending on the characteristics. To solve this problem, we developed an integrated sensor module which can integrate various kinds of sensors used to obtain the necessary information for the area under crop cultivation. In addition, we developed sensor networks monitoring system which is suitable for an integrated sensor module. To verify the operating status of the proposed system, an integrated sensor node is installed in the test environment so that it can sense information of the environment and monitor it in real-time.