• Title, Summary, Keyword: Linux

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Fault Isolation for Linux Device Drivers

  • Son, Sunghoon
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.4
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    • pp.1-8
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    • 2017
  • In this paper, we propose a fault isolation system for device drivers of the Linux operating system. High availability systems impose stringent requirements upon Linux operating system. Especially device drivers can be a major source of operating system instability and many times contribute to system degradation and outages. The proposed fault isolation system identifies the occurrence of the memory-related faults in device driver and isolates it from the kernel. By operating at the early stage of the page fault handler in Linux kernel, the system detects which module causes fault and isolates it transparently from the remaining part of the kernel. By experiments, we show that the proposed system efficiently detects faults incurred by device driver, isolates the device driver and the process which accessed the driver module from the kernel.

Implementation of Linux Virtual Server Load Balancing in Cloud Environment (클라우드 환경에서 Linux Virtual Server 로드밸런싱 구현)

  • Seo, Kyung-Seok;Lee, Bon-Hwan
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.793-796
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    • 2012
  • Recently adoption of the Green IT is regarded as an essential element in order to decrease server heat and save energy in data center because of continuous increase of energy consumption and energy price. Consequently the conventional IT infrastructure is replaced with cloud computing platform. In this paper, we have implemented a Linux virtual server load balancing in open source-based cloud platform and the performance of the LVS load balancing is analyzed.

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A Study on the Development of Hard Disk Recoder and Remote Control Using Embedded Linux (임베디드 리눅스를 이용한 하드디스크 레코더 및 원격 제어 구현에 관한 연구)

  • Park, Seung-Ho;Lee, Jong-Su
    • Proceedings of the KIEE Conference
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    • pp.2429-2431
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    • 2004
  • In this paper, we have designed a remote controlable HDR System using all embedded linux board. The system is composed of three parts - a HDR System, a PC client program for remote control and a Nameserver for registering and aquisition of the IP address. The system is built in an embedded board using a linux kernel. With the Linux the system can support networking and file system for a hard disk management In addition, the system embeds a web-server and a ftp-server for remote manipulation and file transfer. And the hardwares of the system are controlled by the linux device driver mechanism. MPEG1/2 technique is used to compress TV tuner signal and external analog video/audio signal. And compressed data is stored in a hard disk. The data stored in the system is accesable through lan or internet. And RTP protocol is used to enable the system to service live stream of instant video/audio input.

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Performance Evaluation and Comparison of Virtual Firewall on Virtual Server Farm using Mainframe Linux for Security Enhancement (Mainframe Linux를 이용한 가상서버환경의 보안성 강화를 위한 Virtual Firewall의 성능 평가 및 비교)

  • Kim, Tae-Gyoon;Hwang, Jin-ok;Min, Sung-gi
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1145-1148
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    • 2004
  • Mainframe Linux를 이용한 가상서버환경은 점차 기존의 분산서버환경과 유사한 방향으로 진화하고 있다. 이와 같이 구현된 가상의 서버환경에서 보안성의 확보는 필수 사항으로 요구되고 있으며 이와 관련한 여러 방안 중 기존 분산서버환경과 유사한 Virtual Firewall의 필요성이 대두되고 있으며, 이에 본 논문은 분산서버환경의 Firewall 적용 및 Mainframe Linux의 가상서버환경 구현에 관한 연구활동을 바탕으로, Firewall로서의 기능적 요구사항과 Mainframe Linux 환경의 Resource 관리 관련요구사항을 기준으로 Debian 계열의 상용 Virtual Firewall의 적용과 성능에 대한 평가를 수행하였다. 추가로 기존 분산서버환경의 Appliance 형태의 Gigabit Firewall의 성능평가 결과를 비교하여 보았다. 기능 및 성능적인 면에서 기존 분산서버환경의 Firewall 제품들과 유사한 수준과, Resource 관리의 측면에서 타 서버들과 공존하는 가상서버환경에 큰 영향을 미치지 않는 결과를 보여주었다.

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Web-based Building Automation System using Embedded Linux (임베디드 리눅스를 이용한 웹 기반 빌딩자동화시스템)

  • 신은철;이수영;최병욱
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.4
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    • pp.334-340
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    • 2004
  • In this paper, a Web-based management system for the building network is described. A multi-protocol converter based on SoC and embedded Linux is designed. The open source licensing, reliability, and broad hardware support are key reasons for use of embedded Linux in embedded industry. The multi-protocol converter integrates control network of RS-485 and LonWorks devices through TCP/IP protocol for a client with Java applet. The system consists of three-tier architecture, such as a client, a server that is performed on a multi-protocol converter, and control devices. The developed system includes the inverter motor control system with modbus protocol for the RS-485 network. The experiment results show that the multi-protocol converter using embedded Linux is a flexible and effective way to builda Web -based monitoring and control system.

The Design and Implementation of RTiK-Linux to Support Real-Time for User-level on Linux (리눅스상의 사용자영역에 실시간성 지원을 위한 RTiK-Linux의 설계 및 구현)

  • Seo, Dal-Mi;Jo, Ah-Ra;Lee, Cheol-Hoon
    • Proceedings of the Korea Contents Association Conference
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    • pp.263-264
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    • 2012
  • 임베디드 시스템은 특정한 목적을 수행하기 위한 시스템으로써, 자동차, 항공, 조선, 원자력발전소 등 다양한 분야에 사용되고 있는 추세이다. 이러한 임베디드 시스템은 빠른 응답성 및 시간 결정성을 위한 실시간성의 지원여부를 중요시 한다. 하지만 임베디드 시스템에서 사용되고 있는 범용 운영체제인 리눅스의 경우, 실시간성을 제공하지 않는 문제점을 가지고 있기 때문에 실시간성 제공을 위해 RTAI, RT-Linux를 통해 실시간성을 제공하고 있다. 그러나 RTAI는 Hard Real-Time을 제공하지 못하고, RT-Linux는 커널코드를 수정할 때 마다 커널 컴파일을 해야 하는 문제점이 있다. 또한, 사용자가 잘못 구현한 Real-Time 태스크의 오류가 커널에 영향을 미쳐 커널을 멈추게 하는 문제점이 있다. 따라서 리눅스 상에서 실시간성을 제공하면서 개발의 편의성 및 커널의 독립성을 제공할 수 있는 연구가 필요하다. 본 논문에서는 리눅스상의 사용자영역에서의 실시간성을 지원하기 위한 방법을 설계 및 구현을 하였다.

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Search Performance Experiments of SQLite Database on Linux Environments (Linux환경에서 SQLite 데이터베이스의 검색 성능 실험)

  • Kim, Soo-hwan;Choi, Jin-oh
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.445-447
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    • 2016
  • SQLite, Realm, etc. are database engines which are suitable for small devices that have large resource restriction and are used a lot in mobile devices based on Linux. These engines are open source programs and have advantages which are lighter weight and faster speed than general purpose databases. This paper implements performance test program and performs performance experiment of SQLite database to test search efficiency in Linux environments. The experiment is processed by comparison with the results of a Oracle database working out at the same environment.

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A Secure Operating System Architecture Based on Linux against Communication Offense with Root Exploit for Unmanned Aerial Vehicles

  • Koo, KwangMin;Lee, Woo-yeob;Cho, Sung-Ryung;Joe, Inwhee
    • Journal of Information Processing Systems
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    • v.16 no.1
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    • pp.42-48
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    • 2020
  • This paper proposes an operating system architecture for unmanned aerial vehicle (UAV), which is secure against root exploit, resilient to connection loss resulting in the control loss, and able to utilize common applications used in Linux. The Linux-based UAVs are exposed to root exploit. On the other hand, the microkernel-based UAVs are not able to use the common applications utilized in Linux, even though which is secure against root exploit. For this reason, the proposed architecture uses a virtualized microkernel on the Linux operating system to isolate communication roles and prevent root exploit. As a result, the suggested Operating system is secure against root exploit and is able to utilize the common applications at the same time.

Search Performance Analysis of SQLite Database on Linux (Linux에서 SQLite 데이터베이스의 검색 성능 분석)

  • Choi, Jin-oh
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.390-391
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    • 2016
  • SQLite is a database engine which is suitable for small devices that have large resource restriction and is used a lot in mobile devices based on Linux. SQLite is open source program and has advantages which are lighter weight and faster speed. This paper tests SQLite database performance of select in Linux environment, and analyzes the pros and cons of the results. The analysis is processed by comparison with the results of other database working out at the same environment.

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Development of WLAN AP based on IBM 405GP (IBM PowerPC 405GP를 이용한 Wireless LAN Access Point 개발에 관한 연구)

  • Kim Do-Gyu
    • The Journal of Information Technology
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    • v.6 no.3
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    • pp.65-73
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    • 2003
  • The evaluation AP embedded Linux board is implemented. The board is made of IBM 405 GP processor, PPCBoot-1.2.1 boot loader, Linux-2.4.21 kernel and root file system. The evaluation board has two flash memories, boot flash and application flash of size 512Kbyte and 16Mbyte, respectively. And it supports IEEE 802.11a which provide the maximum throughput of 54Mbps in the 5.2GHz frequency band. MTD(Memory Technology Device) and JFFS2(Journalling Flash File System version 2) technologies are adopted to optimally package the system software, boot loader, kernel and root file system. And in order to optimize root file system, busybox package and tiny login are used. Linux kernel and root file system is combined together with mkimage utility.

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