• Title/Summary/Keyword: Link Server

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A study on Cloud Security based on Network Virtualization (네트워크 가상화 기반 클라우드 보안 구성에 관한 연구)

  • Sang-Beom Hong;Sung-Cheol Kim;Mi-Hwa Lee
    • Convergence Security Journal
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    • v.23 no.5
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    • pp.21-27
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    • 2023
  • In the cloud computing environment, servers and applications can be set up within minutes, and recovery in case of fail ures has also become easier. Particularly, using virtual servers in the cloud is not only convenient but also cost-effective compared to the traditional approach of setting up physical servers just for temporary services. However, most of the und erlying networks and security systems that serve as the foundation for such servers and applications are primarily hardwa re-based, posing challenges when it comes to implementing cloud virtualization. Even within the cloud, there is a growing need for virtualization-based security and protection measures for elements like networks and security infrastructure. This paper discusses research on enhancing the security of cloud networks using network virtualization technology. I configured a secure network by leveraging virtualization technology, creating virtual servers and networks to provide various security benefits. Link virtualization and router virtualization were implemented to enhance security, utilizing the capabilities of virt ualization technology. The application of virtual firewall functionality to the configured network allowed for the isolation of the network. It is expected that based on these results, there will be a contribution towards overcoming security vulnerabil ities in the virtualized environment and proposing a management strategy for establishing a secure network.

Design and Implementation of an Alternate System Interconnect based on PCI Express (PCI Express 기반 시스템 인터커넥트의 설계 및 구현)

  • Kim, Young Woo;Ren, Ye;Choi, WonHyuk
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.8
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    • pp.74-85
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    • 2015
  • PCI Express is a well-known and widely used de-facto system bus standard for connecting among a processor and IO devices. PCI Express is originated from old PCI standard, and its most of applications are limited to be used within a PC or server system. But, because of its fast speed, low power consumption, and good protocol efficiency, it is considered as one of a good candidate for an alternate system interconnect for many years. In this paper, we present design, implementation and early evaluation of an alternate system interconnect by utilizing PCI Express. The developed alternate system interconnect using PCI Express (named PCIeLINK) utilizes non-transparent bridging (NTB) technic which generally used in fail-over system in PCI and PCI Express. By using NTB technic, PCI Express device can be extended to outside of a system without electrical and logical problems arising during system boot and enumeration. To build up an alternate system interconnect, we designed and implemented a network interface card having multiple PCI Express ${\times}4$ connections (theoretically 20 Gbps) and tested, The early test results revealed that an ${\times}4$ port in the card showed 8.6 Gbps peak performance for bulk transmission and 5.1 Gbps peak for normal TCP/IP transfer.

The Design and Implementation of the Motorized Valve Control System using CANopen Protocol (CANopen 프로토콜을 이용한 전동밸브 제어시스템 설계 및 구현)

  • Lee, Myung-Eui;Shin, Keun-Soo;Yang, Sung-Hyun
    • Journal of Advanced Navigation Technology
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    • v.14 no.3
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    • pp.321-327
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    • 2010
  • This paper deals with the design and development of the motorized valve control system using CANopen protocol. The CAN network protocol is used in the physical layer(layer 1) and data link layer(layer 2), and other upper network layer above that layer 1 and 2 utilize the CANopen protocol in this paper. The motorized valve controller is implemented by a PIC microprocessor, and the server application software for the control system user is written in C# language. In particular the CANopen protocol is widely used int the area such as ship automation systems and marine transportation systems. The experimental result of the proposed control system implemented in this paper is evaluated via real-time experiments, which works well as designed.

VLC-based ESL system design for interference avoidance in 2.4GHz ISM band (2.4GHz ISM 대역의 간섭회피를 위한 VLC 기반 ESL 시스템 설계)

  • Lee, Sang-gwon;Oh, Chang-heon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2018.05a
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    • pp.636-637
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    • 2018
  • The electronic shelf label(ESL) system based on wireless communication can reduce waste of disposable paper, reduce labor force and update real time information. However, the environment in which a large number of ESL modules are installed is exposed to interference from radio frequency(RF) communications in the Industry-Science-Medical(ISM) band. In this paper, we propose an ESL system based on visible light communication to avoid congestion of ESL system using ISM band. In the proposed system, the goods information and ID transmitted from the administrator server are transmitted in the ESL Tag, and the ESL Tag identifies the ID and displays the product information. Experiments show that ESL system using visible light communication is possible.

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Development of a Real Time 3D Collaboration and Part Information Brokering System Using WWW(World Wide Web) (웹을 이용한 실시간 3차원 공동작업 부품정보중개시스템 개발)

  • 최영상;김영호
    • Korean Journal of Computational Design and Engineering
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    • v.4 no.2
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    • pp.87-99
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    • 1999
  • We developed a Part Information Brokering System, namely PIBS, that can inter-link part suppliers and buyers using WWW(World Wide Web). The major contribution of this paper is that the system provides a 3D collaboration environment that enables multiple users to share the same workspace where they cooperatively manipulate part features in real time. PIBS carries out two major functions: one to maintain part data in a part library, and the other to provide the means for the clients to cooperate. An object-oriented database is used for the part library which stores apart information registered by part suppliers. VRML(Virtual Reality Modeling Language) the ISO standard for 3D visualization on WWW, is used to represent 3D part models. Several Java programs have been implemented to support synchronous and a synchronous communication of the 3D models. Once the users are interconnected through the system, a user's manipulation of part objects is transparently and instantaneously transmitted to the others. This means that all the participants can are the same view and movement of the 3D part models. Since the system is developed using a Java applet-server architecture, it requires no additional software other than standard web browser. The prototype system has been successfully implemented, and demonstrated its applicability to virtual 3D part information sharing.

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Landslide monitoring using wireless sensor network (무선센서 네트워크에 의한 경사면 계측 실용화 연구)

  • Kim, Hyung-Woo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.03a
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    • pp.1324-1331
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    • 2008
  • Recently, landslides have frequently occurred on natural slopes during periods of intense rainfall. With a rapidly increasing population on or near steep terrain in Korea, landslides have become one of the most significant natural hazards. Thus, it is necessary to protect people from landslides and to minimize the damage of houses, roads and other facilities. To accomplish this goal, many landslide prediction methods have been developed in the world. In this study, a simple landslide prediction system that enables people to escape the endangered area is introduced. The system is focused to debris flows which happen frequently during periods of intense rainfall. The system is based on the wireless sensor network (WSN) that is composed of sensor nodes, gateway, and server system. Sensor nodes and gateway are deployed with Microstrain G-Link system. Five wireless sensor nodes and gateway are installed at the man-made slope to detect landslide. It is found that the acceleration data of each sensor node can be obtained via wireless sensor networks. Additionally, thresholds to determine whether the slope will be stable or not are proposed using finite element analysis. It is expected that the landslide prediction system by wireless senor network can provide early warnings when landslides such as debris flow occurs.

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Multi-interface Wireless Mesh Network Testbed using Wireless Distribution System (무선 분산 시스템을 이용한 멀티 인터페이스 무선 메쉬 네트워크 테스트베드)

  • Yoon, Mi-Kyung;Yang, Seung-Chur;Kim, Jong-Deok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.13 no.6
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    • pp.1077-1082
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    • 2009
  • Wireless Mesh Network(WMN) is wireless backbone networks technique which has ease of network configuration and cost of advantage. Recently, WNM released a new product, but most of existing research and technology analysis the performance through the simulation. This paper build the wireless mesh network testbed for actual situation. Testbed supports multi-channel multi-interface using bridge, the Wireless Distribution System and dynamic location-based routing protocol. This routing protocol strongly design against wireless interference using metric for link channel change and real distance. Then, the address of mesh clients assigned by the centralized address management server. Mesh clients is designed and implemented to manage network through Simple Network Management Protocol.

A Study on Developing Traffic Data Converting Algorithm for FM DARC (FM DARC용 교통정보 변환알고리즘 개발)

  • Lee, Bong-Gyu
    • Journal of Korea Spatial Information System Society
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    • v.2 no.2 s.4
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    • pp.39-48
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    • 2000
  • The purpose of this study is to develop a converting algorithm for providing real-time traffic information through the FM DARC(DAta Radio Channel). The converting algorithm based on the GIS node-link system enables raw traffic data to be a standard traffic information. The standard traffic information in data quality, quantity and format is an essential to construct the FM DARC traffic information system effectively. We have developed the algorithm and applied it to the FM DARC system. After introducing FM DARC briefly, this paper presents GIS DB, the converting algorithm and the client/server FM DARC system.

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Design and Implementation of Customer Personalized System Using Web Log and Purchase Database

  • Lee Jae-Hoon;Chung Hyun-Sook;Lee Sung-Joo
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.6 no.1
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    • pp.21-26
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    • 2006
  • In this paper, we propose a customer personalized system that presents the web pages to users which are customized to their individuality. It analyzes the action of users who visit the shopping mall, and preferentially supplies the necessary information to them. When they actually buy some items, it forecasts the user's access pattern to web site and their following purchasable items and improves their web page on the bases of their individuality. It reasons the relation among the web documents and among the items by using the log data of web server and the purchase information of DB. For reasoning, it employs Apriori algorithm, which is a method that searches the association rule. It reasons the web pages by considering the user's access pattern and time by using the web log and reasons the user's purchase pattern by using the purchase information of DB. On the basis of the relation among them, it appends the related web pages to link of user's web pages and displays the inferred goods on user's web pages.

Packet-Level Scheduling for Implant Communications Using Forward Error Correction in an Erasure Correction Mode for Reliable U-Healthcare Service

  • Lee, Ki-Dong;Kim, Sang-G.;Yi, Byung-K.
    • Journal of Communications and Networks
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    • v.13 no.2
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    • pp.160-166
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    • 2011
  • In u-healthcare services based on wireless body sensor networks, reliable connection is very important as many types of information, including vital signals, are transmitted through the networks. The transmit power requirements are very stringent in the case of in-body networks for implant communication. Furthermore, the wireless link in an in-body environment has a high degree of path loss (e.g., the path loss exponent is around 6.2 for deep tissue). Because of such inherently bad settings of the communication nodes, a multi-hop network topology is preferred in order to meet the transmit power requirements and to increase the battery lifetime of sensor nodes. This will ensure that the live body of a patient receiving the healthcare service has a reduced level of specific absorption ratio (SAR) when exposed to long-lasting radiation. We propose an efficientmethod for delivering delay-intolerant data packets over multiple hops. We consider forward error correction (FEC) in an erasure correction mode and develop a mathematical formulation for packet-level scheduling of delay-intolerant FEC packets over multiple hops. The proposed method can be used as a simple guideline for applications to setting up a topology for a medical body sensor network of each individual patient, which is connected to a remote server for u-healthcare service applications.