• Title/Summary/Keyword: Network Enhancement

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Bandwidth Enhancement for a Proximity Coupled Microstrip patch Antenna with an Impedance Matching Network (임피던스 정합기를 이용한 근접 결합 급전 패치 안테나의 대역폭 확장)

  • Kwak, Eun-Hyuk;Kim, Boo-Gyoun
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.2
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    • pp.55-69
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    • 2015
  • Bandwidth enhancement technique for a proximity coupled patch antenna is investigated. The bandwidth and radiation characteristics of a proximity coupled patch antenna with an integrated impedance matching network printed on substrates with various dielectric constants and thicknesses are compared to those of a proximity coupled patch antenna without an impedance matching network. The bandwidth of a proximity coupled patch antenna with an integrated impedance matching network is greatly increased than that of a proximity coupled patch antenna without an impedance matching network without the degradation of radiation characteristics.

Performance Analysis and Experiment of Network Architecture for Distributed Control System

  • Lee, Sung-Woo;Gwak, Kwi ?Yil;Song, Seong-Il;Park, Doo-Yong
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.334-337
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    • 2005
  • This paper describes the implementation of DCS communication network that provides high bandwidth and reliability. The network for DCS in this paper adopts the Reflective Memory (RM) architecture and Fast Ethernet physical media that have 100Mbps bandwidth. Also, this network uses Ring Enhancement Device (RED) which was invented to reduce the time delay of each node. The DCS network that is introduced in this paper is named as ERCNet(Ethernet based Real-time Control Network). This paper describes the architecture and working algorithms of ERCNet and performs numerical analysis. In addition, the performance of ERCNet is evaluated by experiment using the developed ERCNet network.

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Trends and Analysis of 4G Wireless User Access Networks Issues (4G 무선가입자망 구축 동향 및 고도화 방안)

  • Hwang, Ho-Young;Hong, Jung-Wan;Kim, Seung-Cheon;Roh, Kwang-Hyun
    • The Journal of Society for e-Business Studies
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    • v.16 no.3
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    • pp.145-158
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    • 2011
  • Recently, the rapidly increased use of smartphone devices provides both opportunity and problems at the same time to the telecom companies in domestic and world wide. It provides a great opportunity to overcome the market stagnation of the existing voice- centric communications, and also problems of building a highly efficient new wireless access networks to accommodate huge volume of data traffic among smart devices. Facing with the age of keen competition, telecom companies have two kinds of strategies for network transition; a strategy of building uniform LTE -based 4G networks as fast as possible, and a hybrid network enhancement strategy compounding 3G and 4G networks using HSP A+, WiFi, cloud computing, etc. It is difficult to predict which strategy will have more successful outcome in the near future. This paper studies the trends and issues of network enhancement policies and transition strategies to the 4G network era, and tries to draw appropriate and efficient ways for network enhancement and operation.

Robust speech quality enhancement method against background noise and packet loss at voice-over-IP receiver (배경잡음 및 패킷손실에 강인한 voice-over-IP 수신단 기반 음질향상 기법)

  • Kim, Gee Yeun;Kim, Hyoung-Gook
    • The Journal of the Acoustical Society of Korea
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    • v.37 no.6
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    • pp.512-517
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    • 2018
  • Improving voice quality is a major concern in telecommunications. In this paper, we propose a robust speech quality enhancement against background noise and packet loss at VoIP (Voice-over-IP) receiver. The proposed method combines network jitter estimation based on hybrid Markov chain, adaptive playout scheduling using the estimated jitter, and speech enhancement based on restoration of amplitude and phase to enhance the quality of the speech signal arriving at the VoIP receiver over IP network. The experimental results show that the proposed method removes the background noise added to the speech signal before encoding at the sender side and provides the enhanced speech quality in an unstable network environment.

A Study on the Security Enhancement for Personal Healthcare Information of CloudHIS (CloudHIS의 개인 의료정보를 위한 보안강화에 관한 연구)

  • Cho, Young-Sung;Chung, Ji-Moon;Na, Won-Shik
    • Journal of Convergence for Information Technology
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    • v.9 no.9
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    • pp.27-32
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    • 2019
  • Along with the growth of u-Healthcare, we propose a security enhancement based on network separation for CloudHIS with for handling healthcare information to cope with cyber attack. To protect against all security threats and to establish clear data security policies, we apply desktop computing servers to cloud computing services for CloudHIS. Use two PCs with a hypervisor architecture to apply physical network isolation and select the network using KVM switched controller. The other is a logical network separation using one PC with two OSs, but the network is divided through virtualization. Physical network separation is the physical connection of a PC to each network to block the access path from both the Internet and the business network. The proposed system is an independent desktop used to access an intranet or the Internet through server virtualization technology on a user's physical desktop computer. We can implement an adaptive solution to prevent hacking by configuring the CloudHIS, a cloud system that handles medical hospital information, through network separation for handling security enhancement.

Clustering Formation and Topology Control in Multi-Radio Multi-Channel Wireless Mesh Networks

  • Que, Ma. Victoria;Hwang, Won-Joo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.7B
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    • pp.488-501
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    • 2008
  • Convergence of various wireless systems can be cost effectively achieved through enhancement of existing technology. The emergence of Wireless Mesh Network (WMN) entails the interoperability and interconnection of various wireless technologies in one single system. Furthermore, WMN can be implemented with multi-radio and multi-channel enhancement. A multi-radio, multi-channel wireless mesh network could greatly improve certain networking performance metrics. In this research, two approaches namely, clustering and topology control mechanisms are integrated with multi-radio multi-channel wireless mesh network. A Clustering and Topology Control Algorithm (CTCA)is presented that would prolong network lifetime of the client nodes and maintain connectivity of the routers.

Comparative Analysis of Deep Learning Researches for Compressed Video Quality Improvement (압축 영상 화질 개선을 위한 딥 러닝 연구에 대한 분석)

  • Lee, Young-Woon;Kim, Byung-Gyu
    • Journal of Broadcast Engineering
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    • v.24 no.3
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    • pp.420-429
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    • 2019
  • Recently, researches using Convolutional Neural Network (CNN)-based approaches have been actively conducted to improve the reduced quality of compressed video using block-based video coding standards such as H.265/HEVC. This paper aims to summarize and analyze the network models in these quality enhancement studies. At first the detailed components of CNN for quality enhancement are overviewed and then we summarize prior studies in the image domain. Next, related studies are summarized in three aspects of network structure, dataset, and training methods, and present representative models implementation and experimental results for performance comparison.

Study of the Enhancement Performance and Security of Inbound Network (인바운드 네트워크의 성능 및 보안성 향상에 관한 연구)

  • Jeon, Jeong-Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.8B
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    • pp.727-734
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    • 2008
  • Recently, Network technology evolve out of expansion a scale of Network and development various Service. also Hacking skill. We have applied to various Security Systems to make a counterattack on this hacking skill. and A Firewall among these security systems is very effective a defense against in the Outbound Network attack. so we need certainly a Firewall to protect a network. But this Conventional Firewall has an directly effect on reduction to the Performance and Security of Inbound Network. and have no effect on a Inner Network Attacking. In this paper, I propose to a "Functional Firewall" as a Secure Objects for the enhancement Performance and Security of Inbound Network.

Performance Analysis and Experiment of Ethernet Based Real-time Control Network Architecture (이더넷기반의 실시간 제어 통신망 구조의 성능 해석 및 실험)

  • Lee, Sung-Woo
    • Journal of Energy Engineering
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    • v.14 no.2 s.42
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    • pp.112-116
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    • 2005
  • This paper describes the implementation of DCS communication network that provides high bandwidth and reliability. The network for DCS in this paper adopts the Reflective Memory (RM) architecture and Fast Ethernet physical media that have 100 Mbps bandwidth. Also, This network uses Ring Enhancement Device (RED) which is invented to reduce the time delay of each node. The DCS network that is introduced in this paper is named as ERCNet (Ethernet based Real-time Control Network). This paper describes the architecture and working algorithms of ERCNet and performs numerical analysis. In addition, the performance of ERCNet is evaluated by experiment using the developed ERCNet network.

Vehicle Detection at Night Based on Style Transfer Image Enhancement

  • Jianing Shen;Rong Li
    • Journal of Information Processing Systems
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    • v.19 no.5
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    • pp.663-672
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    • 2023
  • Most vehicle detection methods have poor vehicle feature extraction performance at night, and their robustness is reduced; hence, this study proposes a night vehicle detection method based on style transfer image enhancement. First, a style transfer model is constructed using cycle generative adversarial networks (cycleGANs). The daytime data in the BDD100K dataset were converted into nighttime data to form a style dataset. The dataset was then divided using its labels. Finally, based on a YOLOv5s network, a nighttime vehicle image is detected for the reliable recognition of vehicle information in a complex environment. The experimental results of the proposed method based on the BDD100K dataset show that the transferred night vehicle images are clear and meet the requirements. The precision, recall, mAP@.5, and mAP@.5:.95 reached 0.696, 0.292, 0.761, and 0.454, respectively.