• Title/Summary/Keyword: Host Controller

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Implementation of RS232C Serial Communication by CSMA protocol (충돌검지 다중접속(CSMA) 프로토콜에 의한 RS232C 직렬통신의 구현)

  • Kwak, Hee-Soo;Han, Kyong-Ho
    • Proceedings of the KIEE Conference
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    • 1998.07g
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    • pp.2473-2475
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    • 1998
  • In this paper, we implemented RS232C serial communication by the 2 wires(Data,GND), and multiple access, by the applying Collision Sensing Multiple Access(CSMA) Protocol. Multiple access is implemented by assigning a unique ID to each controller. The multiple access control operation starts by sending a command packet from a host to another host and the command packet is composed of ID bytes of source and target host computer, data bytes and the check sum, byte. In host computer, after sending command packet, the collision from loop back data. If collision is detected, it means a command packet was collided with another command packet for another host. The packet communication of the controller enables the multiple acces of the controller through the common serial data link. The application of this serial communication through CSMA protocol and the usage of two wires, have an effect on saving the wires and convenient of layout work.

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분산 제어기 구조를 갖는 마스터 암의 기구학 설계 및 해석

  • Lee, Jangwook;Kim, Yoonsang;Lee, Sooyong;Kim, Munsang
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.6
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    • pp.532-539
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    • 2001
  • In robot teleoperation, much research has been carried out to control the slave robot from remote site. One of the essential devices for robot teleoperation is the masterarm, which is a path command generating device worn on human arm. In this paper, a new masterarm based on human kinematics is proposed. Its controller is based on the distributed controller architecture composed of two controller parts: a host controller and a set of satellite controllers. Each satellite controller measures the corresponding joint angle, while the host controller performs forward and inverse kinematics calculation. This distributed controller architecture can make the data updating faster, which allows to implement real-time implementation. The host controller and the satellited controllers are networked via three-wire daisy-chained SPI(Serial Peripheral Interface) protocol, so this architecture makes the electrical wiring very simple, and enhances maintenance. Analytical method for finding three additional unknown joint angles is derived using only three measured angles for each shoulder and wrist, which makes th hardware implementation very simple by minimizing the required number of satellite controllers. Finally, the simulation and experiment results are given to demonstrate the usefulness and performance of the proposed masterarm.

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Design and implementation of outbound traffic controller for the prevention of ICMP attacks (ICMP 공격 방지를 위한 outbound traffic controller의 설계 및 구현)

  • Yoo, Kwon-jeong;Kim, Eun-gi
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.3
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    • pp.549-557
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    • 2017
  • ICMP(Internet Control Message Protocol) is a main protocol in TCP/IP protocol stack. ICMP compensates the disadvantages of the IP that does not support error reporting. If any transmission problem occurred, a router or receiving host sends ICMP message containing the error cause to sending host. However, in this process, an attacker sends a fake ICMP messages to the host so that the communication can be terminated abnormally. An attacker host can paralyzes system of victim host by sending a large number of messages to the victim host at a high rate of speed. To solve this problem, we have designed and implemented outbound traffic controller that prevents various ICMP attacks. By preventing the transmission of attack messages in different ways according to each case, various network attacks can be prevented. In addition, unnecessary network traffic can be filtered before transmitted.

A study on the outbound traffic controller for prevention of ICMP attacks (ICMP 공격 방지를 위한 outbound traffic controller에 관한 연구)

  • Yoo, Kwon-joeong;Kim, Eun-gi
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2016.10a
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    • pp.759-761
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    • 2016
  • ICMP(Internet Control Message Protocol) supports the processing of error in the communication network based TCP/IP. If a problem is occurred in a data transmission process, router or receiving host sends ICMP message containing the error cause to sending host. However, in this process an attacker sends a fake ICMP message to the host so that the communication between the hosts can be abnormally terminated. In this paper, we performed a study to prevent several attacks related to ICMP. To this, we have designed outbound traffic controller so that attack packet is not transmitted to network in operating system of host.

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NDynamic Framework for Secure VM Migration over Cloud Computing

  • Rathod, Suresh B.;Reddy, V. Krishna
    • Journal of Information Processing Systems
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    • v.13 no.3
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    • pp.476-490
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    • 2017
  • In the centralized cloud controlled environment, the decision-making and monitoring play crucial role where in the host controller (HC) manages the resources across hosts in data center (DC). HC does virtual machine (VM) and physical hosts management. The VM management includes VM creation, monitoring, and migration. If HC down, the services hosted by various hosts in DC can't be accessed outside the DC. Decentralized VM management avoids centralized failure by considering one of the hosts from DC as HC that helps in maintaining DC in running state. Each host in DC has many VM's with the threshold limit beyond which it can't provide service. To maintain threshold, the host's in DC does VM migration across various hosts. The data in migration is in the form of plaintext, the intruder can analyze packet movement and can control hosts traffic. The incorporation of security mechanism on hosts in DC helps protecting data in migration. This paper discusses an approach for dynamic HC selection, VM selection and secure VM migration over cloud environment.

Development of NC controller using personal computer (PC를 이용한 NC제어장치의 개발)

  • 김일환;강용근;정광조
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.308-312
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    • 1989
  • We developed a model of NC controller with IBM-PC as a host cpu and integlligent NC servo controller for 2 axes that can be expaned to 4 axes. Basic conceptions, including hardware structure design, servo controller design, communication protocol, and interpolation hardware design was already publicated on '87 KIEE conference. Following this, we focussed on the emulation of tyhe controller with X-Y table as complete NC machine experimenting some drawings made by NC code program that can be edited and executed in automatic on single step mode. In addition we designed the M.S.T functions with PLC and tested for M-function timing. Finally, we designed NC interface to fit with M-function output and we contructed total system of NC controller with IBM PC host with the result of successful development of new NC model.

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Study On Development of Fast Image Detector System (고속 영상 검지기 시스템 개발에 관한 연구)

  • 임태현;이종민;김용득
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.241-244
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    • 2003
  • Nowadays image processing is very useful for some field of traffic applications. The one reason is we can construct the system in a low price, the other is the improvement of hardware processing power, it can be more fast to processing the data. In this study, I propose the traffic monitoring system that implement on the embedded system environment. The whole system consists of two main part, one is host controller board, the other is image processing board. The part of host controller board take charge of control the total system, interface of external environment. and OSD(On screen display). The part of image processing board takes charge of image input and output using video encoder and decoder, image classification and memory control of using FPGA, control of mouse signal. And finally, fer stable operation of host controller board, uC/OS-II operating system is ported on the board.

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Development of ZigBee Wireless Communication System for Remote Diagnosis in Distribution Power Lines (배전선로 원격 진단을 위한 ZigBee 무선통신 시스템 개발)

  • Lee, Kyeong-Seob;Chung, Dong-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.28 no.9
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    • pp.602-606
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    • 2015
  • This paper presents a ZigBee wireless communication system for remote diagnosis in overhead distribution power lines. The system is divided in three parts in the functional aspect - a host computer module, a remote controller module and a diagnostic system module. The host computer module designed as USB interface transmits control signals and receive data measured by sensor. The remote controller module operates the diagnostic system. Diagnostic system module communicates with internal main controller and host computer USB. Multiple communication channel is adopted for simultaneous operations of several diagnostic system. Dedicated protocol for each module is developed. The system is designed with a focus on low cost and small size suitable for lightweight and small diagnostic system.

Implementation of Web Based Embedded Digital Frame Using Nios II Embedded Processor and ${\mu}Clinux$ (Nios II 임베디드 프로세서와 ${\mu}Clinux$를 이용한 웹기반 임베디드 디지털 액자 구현)

  • Jeong, Mun-Su;Yang, Heui-Hwan;Jeong, Je-Myung
    • Proceedings of the Korean Information Science Society Conference
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    • 2008.06d
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    • pp.327-331
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    • 2008
  • 본 논문에서는 ALtera Cyclone II FPGA와 VGA Controller, ISP1362 Host Controller, DM9000A Ethernet Controller를 사용하여 FPGA를 구성하고, ${\mu}Clinux$를 포팅하여 Nano-X 기반에서 JPEG 파일을 디스플레이 시키는 임베디드 디지털 액자를 구현한다. 구현한 시스템은 일반적인 마이크로프로세서를 사용하지 않고 Altera 사의 Cyclone II FPGA를 이용해 직접 프로세서를 설계하고, ISP1362 Host Controller를 이용하여 USB 드라이브를 인식하며, DM9000A를 통해 웹과 연결하여 웹서버로부터 전송되어진 JPEG 이미지를 Display 할 수 있도록 설계하였다.

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Design and Implementation of RAID Controller using Serial ATA Interface (Serial ATA Interface를 통한 RAID Controller 보드의 설계 및 구현)

  • Lim, Seung-Ho;Lee, Ju-Pyung;Park, Kyu-Ho
    • Proceedings of the KIEE Conference
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    • 2003.11c
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    • pp.665-668
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    • 2003
  • In this paper, we have designed and implemented the RAID controller board which connects to the host computer with serial ATA interface and connects to the disks with parallel ATA interface. Serial ATA interface is proposed to overcome the design limitation of parallel ATA while enabling the storage interface to scale with the slowing media rate demands for PC platforms. Serial ATA is to replace parallel ATA with the compatibility with existing operating systems and drivers, adding performance headroom for years to come. It Moreover, serial ATA provides even faster transfer rate of 150 Mbytes/s which is larger than that of current parallel ATA. The RAID controller board designed in this paper combines up to 4 disks with parallel ATA interface, and connects to PC host computer with serial ATA interface. We have implemented RAID controller using Verilog HDL language with FPGA chip. The RAID controller supports RAID level 0 and 1 functionality. Experimently, the average read/write performance of parallel ATA interface is about 30 Mbytes/s. Therefore, when 4 parallel disks is connected to the RAID controller board, we can get almost full throughput of serial ATA protocol using the RAID level 0 configuration with 4 disks.

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