• Title/Summary/Keyword: Network equipment

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Audio Signal Processing and System Design for improved intelligibility in Conference Room (회의실의 명료성(STI) 향상을 위한 오디오신호 처리 및 시스템 설계)

  • Kang, Cheolyong;Lee, Seokjoo;Jo, Kwangyeon;Lee, Seonhee
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.17 no.2
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    • pp.225-232
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    • 2017
  • Recently, the development of digital transmission technology of audio signals and the introduction of audio network equipment using digital transmission technology have been made. As a result, audio network technology and equipment are actively applied to the design and construction of audio systems. The meeting room is a place where a large number of participants exchange opinions and communicate with each other. In addition to using an electric acoustic device such as a microphone and a speaker, it improves the intelligibility of the conference room through an example using an audio network.

Cybersecurity Development Status and AI-Based Ship Network Security Device Configuration for MASS

  • Yunja Yoo;Kyoung-Kuk Yoon;David Kwak;Jong-Woo Ahn;Sangwon Park
    • Journal of Navigation and Port Research
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    • v.47 no.2
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    • pp.57-65
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    • 2023
  • In 2017, the International Maritime Organization (IMO) adopted MSC.428 (98), which recommends establishing a cyber-risk management system in Ship Safety Management Systems (SMSs) from January 2021. The 27th International Association of Marine Aids to Navigation and Lighthouse Authorities (IALA) also discussed prioritizing cyber-security (cyber-risk management) in developing systems to support Maritime Autonomous Surface Ship (MASS) operations (IALA guideline on developments in maritime autonomous surface ships). In response to these international discussions, Korea initiated the Korea Autonomous Surface Ship technology development project (KASS project) in 2020. Korea has been carrying out detailed tasks for cybersecurity technology development since 2021. This paper outlines the basic concept of ship network security equipment for supporting MASS ship operation in detailed task of cybersecurity technology development and defines ship network security equipment interface for MASS ship applications.

A Cooperative Security Gateway cooperating with 5G+ network for next generation mBcN (차세대 mBcN을 위한 5G+ 연동보안게이트웨이)

  • Nam, Gu-Min;Kim, Hyoungshick;Lee, Hyun-Jin;Cho, Hark-Su
    • Journal of Internet Computing and Services
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    • v.22 no.6
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    • pp.129-140
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    • 2021
  • The next generation mBcN should be built to cooperate with the wireless network to support hyper-speed and hyper-connectivity. In this paper, we propose a network architecture for the cooperation mBcN and 5G commercial network and architecture of the cooperative security gateway required for the cooperation. The proposed cooperative security gateway is between gNB and UPF to support LBO, SFC, and security. Our analysis shows that the proposed architecture has several advantages. First of all, user equipment connected with the mBcN can be easily connected through the 5G commercial radio network to the mBcN. Second, the military application traffic can be transmitted to mBcN without going through the 5G core network, reducing the end-to-end transmission delay without causing the traffic load on the 5G core network. In addition, the security level of the military application can effectively be maintained because the user equipment can be connected to the cooperative security gateway, and the traffic generated by the user equipment is transmitted to the mBcN without going through the 5G core network. Finally, we demonstrate that LBO, SFC, and security modules are essential functions of the proposed gateway in the 5G test-bed environment.

Energy-Efficient Power Control for Underlaying D2D Communication with Channel Uncertainty: User-Centric Versus Network-Centric

  • Ding, Jianfeng;Jiang, Lingge;He, Chen
    • Journal of Communications and Networks
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    • v.18 no.4
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    • pp.589-599
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    • 2016
  • Most existing resource management problem models arise from the original desire of allocating resources in either a user-centric or network-centric manner. The difference between their objectives is obvious: user-centric methods attempt to optimize the utility of individual users, whereas network-centric models intend to optimize the collective utilities of the entire network. In this paper, from the above two aspects, we analyze the robust power control problem in device-to-device (D2D) communication underlaying cellular networks, where two types of channel uncertainty set (e.g., ellipsoidal and column-wise) are considered. In the user-centric method, we formulate the problem into the form of a Stackelberg game, where the energy efficiency (EE) of each user is the ingredient of utility function. In order to protect the cellular user equipment's (CUE) uplink transmission, we introduce a price based cost function into the objectives of D2D user equipment (DUE). The existence and uniqueness of the game with the influence of channel uncertainty and price are discussed. In the network-centric method, we aim to maximize the collective EE of CUEs and DUEs. We show that by the appropriate mathematical transformation, the network-centric D2D power control problem has the identical local solution to that of a special case of the user-centric problem, where price plays a key role. Numerical results show the performance of the robust power control algorithms in the user-centric and network-centric models.

An Implementation of the Dual Packet Seamless Transfer Protocol for Safety-related Railway Signaling System Network (철도 신호시스템의 Fail-Safe 네트워크를 위한 DPST(Dual Packet Seamless Transfer) 프로토콜의 구현)

  • Kim, Kyung-Shik;Ryu, Shin-Hyung;Kwon, Cheol;Lee, Jong-Seong
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.396-405
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    • 2009
  • An interlocking equipment of railway signalling systems should have very high functional safety and reliability properties because of its vital railway protection functionality. In order to achieve the required safety and reliability level, an engineer, in general, designs and implements the interlocking equipment to operate under RTOS(Realtime Operating System) environment, and the control hardware architecture redundant to cope with the random failures of system or subsystem. In such an architecture, it's very difficult to implement the interlocking equipment to communicate with various interface systems including the signal operator's terminal. In this paper, we propose a dual ethernet network topology and dual packet seamless transfer protocol algorithm for railway signaling system such as the interlocking equipment. We verify in this paper that the proposed DPST protocol algorithm has the evidence of its robust properties against the random hardware faults and communication errors. The proposed communication structure and algorithm is implemented in the electronic interlocking equipment for the private railway system of Hyundai Steel Company and its performance and properties are validated on the guideline of European Railway Standard EN50159.

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A Study of Digital Message Transfer System based on R-NAD for FM Radios (FM무전기를 통한 디지털 메시지 전송장비에 R-NAD 적용 연구)

  • Rho, Hai-Hwan;Kim, Young-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.05a
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    • pp.523-526
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    • 2010
  • FM Radio communication operating mode is half-duplex mode. FM radio network access control shall be used to detect the presence of active transmissions on a multiple-subscriber-access communications network and shall provide a means to preclude data transmissions from conflicting on the network. In this study, we implemented R-NAD(Random Network Access Delay) that is one of network access control method.

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A Development of Measuring Instrument of Portable Partial Discharge for Diagnosis of GIS Installation and Application (GIS 설비 진단을 위한 포터블 부분방전 측정장치 개발 및 응용)

  • Kim, Jong-Seo;Kim, Jin-Tea;Shin, Heung-Sik;Lee, Heung-Jea
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.2
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    • pp.231-234
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    • 2009
  • Recently, to the development of a highly information-oriented society to a large increase in dependence on power, Accordingly, it is need that active development and spread of preservation technology on accident prevention in operation electrical equipment. However, to lack of the use on maintenance technology of power equipment and to increase of power usage is growing deterioration of power equipment, this is a cause on casualties, property damage and the occurrence of disasters is a growing. GIS equipments which are operated from domestic except the equipment which manages from the big business are depend on a most visual inspection, and do inspection method or measuring instrument etc. a condition which is not supplied widely. Currently, many to measure instrument used in domestic is very expensive or foreign, it will be able to substitute this, the development necessity of the diagnosis technique and the measuring instrument is demanded.

Development of Ultrasonic Test Equipment for Investigating the Morphology of Barrier Materials

  • Kim Sung-Ho;Lee Young-Sam
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.6 no.3
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    • pp.217-222
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    • 2006
  • Recently, LG chemical corporation developed new material called HYPERIER, which has an excellent barrier characteristic. It has many layers which are made of nano-composite within LDPE(Low-Density Poly Ethylene). In order to guarantee the quality of the final product from the production line, a certain test equipment is required to investigate the existence of layers inside the HYPERIER. In this work, ultrasonic sensor based test equipment for investigating the existence of inner layers is proposed. However, it is a tedious job for human operators to check the existence by just looking at the resounding waveform from ultrasonic sensor. Therefore, to enhance the performance of the ultrasonic test equipment, wavelet and PCA(Principle Componet Analysis) schemes are introduced into neural network scheme which is used for classification. To verify the feasibility of the proposed scheme, some experiments are executed.

Development of a Measuring Instrument of Current and Voltage on Power-Transmission Lines for the Construction of Energy-Network

  • Park, Kyi-Hwan;Jiang, Zhongwei
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.107.2-107
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    • 2001
  • We propose portable equipment that monitors a current and potential on high-potential power transmission lines. In the equipment, a current and voltage sensor are attached to a hollow insulator that supports a power transmission line: A current on a power line is detected by an air-core solenoidal coil clamped to the line and the detected current signal is transmitted to the ground station by using optical data link, A potential on a power transmission line is detected by a high resistance element, zinc oxide (ZnO) that acts as a potential divider between the power line and the ground. The equipment does not require high potential insulators and magnetic cores which. This leads to the following advantages of the equipment: (a) It is easily installed owing to its small size and its simple structure; (b) It operates in low ...

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A Development of Integrated Controller Platform Based on Remote and Wired Communication under special environment (특수환경에서 사용되는 유무선 통신 기반의 통합 제어기 플랫폼 개발)

  • Shin, Jeho;Kim, Gun-Yeon;Kwak, Dae-Sik;Choi, Gisu
    • Proceedings of the Korea Information Processing Society Conference
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    • 2015.10a
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    • pp.258-260
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    • 2015
  • 특수목적 기계 등에 사용되는 시스템은 재난환경에서 환경인지 및 인명탐지, 가시성 확보를 위한 다양한 센서 Network, 목적에 맞는 Actuator 구동기능, 영상신호를 포함한 정보수집/전달과 그에 상응하는 제어 기능을 커버하는 플랫폼 기술이 중요하며, 이 목적을 위해 유무선 조합구성으로 통신의 신뢰성을 높이고, 다양한 센서 네트워크를 구비한 독립모듈 운영을 통해 보다 광범위한 장소를 탐색 정보를 제공하고, 이러한 정보를 이용하여 특수목적용도를 높일 수 있는 특수목적 기계용 제어기 Platform 전반에 관한 연구이다.