• Title, Summary, Keyword: logical device

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A Study on Device Driver for Fault-Tolerant System (결함허용시스템의 디바이스 드라이버에 관한 연구)

  • Shin, Duck-Ho;Lee, Jong-Woo;Hwang, Jong-Kue;Jung, Eui-Jin
    • Proceedings of the KIEE Conference
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    • pp.2243-2245
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    • 2002
  • This paper show Device Driver for RTOS-FT Systems. In this paper a definition of Device Driver is introduced which is used in RTOS-FT Systems. The structure of Device Driver is briefly divided into physical layer and logical layer. The specific characteristic of physical field and logical field which is discussed in this paper is suggested for the system which is satisfied with fault-tolerant theory.

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A study on Device Driver for RTOS-FT System (RTOS-FT 시스템의 디바이스 드라이버에 관한 연구)

  • 권용진;신덕호;유광균;이기서
    • Proceedings of the KSR Conference
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    • pp.461-466
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    • 2002
  • This paper show Device Driver for RTOS-FT Systems. In this paper, a definition of Device Driver is introduced which is used in RTOS-FT Systems. The structure of Device Driver is briefly divided into physical layer and logical layer. The specific characteristic of Physical Held and logical field which is discussed in this paper is suggested for the system which is satisfied with fault-tolerant theory.

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A Study and Application of Methodology for Applying Simulation to Car Body Assembly Line using Logical Model (Logical 모델을 활용한 자동차 차체 조립 라인의 시뮬레이션 적용을 위한 방안 연구 및 적용)

  • Koo, Lock-Jo;Park, Snag-Chul;Wang, Gi-Nam
    • Korean Journal of Computational Design and Engineering
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    • v.14 no.4
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    • pp.225-233
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    • 2009
  • The objective of this paper is to examine a construction method and verify PLC logic using the logical modeling and simulation of a virtual plant has complex manufacturing system and the domain of application is car body assembly line of automotive industrial operated by PLC Program. The proposed virtual plant model for the analysis of the construction method consists of three types of components which are virtual device, intermediary transfer and controller is modeled by logical model but it the case of the verification of PLC program, HMI and PLC logic in the field substitute for the controller. The implementation of the proposed virtual plant model is conducted PLC Studio which is an object-oriented modeling language based on logical model. As a result, proposed methods enable 3D graphics is designed in the analysis step to use for verification of PLC program without special efforts.

Reliable and Flexible Storage System for NAS Environments (NAS를 위한 신뢰성과 확장성이 있는 저장 장치 시스템)

  • Lee, Tae-Keun;Kang, Yong-Hyeog;Eom, Young-Ik
    • The KIPS Transactions:PartD
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    • v.10D no.7
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    • pp.1085-1092
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    • 2003
  • The rapid growth of high speed multimedia services demands the large capacity of the server's storage that maintains the multimedia contents. Among the server's devices, the low I/O speed and physical or logical failure of storage device decrease the total performance of system. The continuous increase of multimedia contents require the flexibility of storage capacity. In order to solve the these problems, we propose the uses of software RAID and LVM techniques that provide the performance improvement and reliability of storage device and the flexibility of storage device respectively. In the LINUX 2.4 kernel, we implemented the reliable and flexible storage device and evaluated the performance of it.

The Development of Interoperability Tester for the IEC 61850 based on TTCN-3 (TTCN-3 적합성 시험 언어를 이용한 IEC61850 상호 연동성 시험기 개발)

  • Song, Byung-Kwen;Lee, Suk-Hee
    • Journal of IKEEE
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    • v.14 no.3
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    • pp.210-218
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    • 2010
  • TTCN-3(Testing & Test Control Notation Version 3) is the international standard testing language defined by ETSI in 2001. TTCN-3 is generally used for protocol conformance test, but it is also possible to be applied to the platform and API tests based on CORBA. Moreover, it can be also applied to the various testings such as interworking testing, repetition testing, platform testing, etc. IEC 61850 is the protocol proposed for SAS(Substation Automation System) of SCADA(Supervisory Control And Data Acquisition) system. In this paper, a IEC 61850 interoperability Tester based TTCN-3 is developed under the Window environment. IEC 61850 Server Simulator of Linux operating system is used as SUT(System Under Test). Conformance testing items in this paper are the Positive test case_Srv5 of "Server, Logical device, Logical node, and data model" in the testing group of "IEC 61850 - Part10" document.

Electrical Characteristics of the PIP Antifuse for Configuration of the Programmable Logic Circuit (프로그램 가능한 논리 회로 구성을 위한 PIP 앤티퓨즈의 전기적 특성)

  • 김필중;윤중현;김종빈
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.12
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    • pp.953-958
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    • 2001
  • The antifuse is a semi-permanent memory device like a ROM which shows the open or short state, and a switch device connecting logic blocks selectively in FPGA. In addition, the antifuse has been used as a logic device to troubleshoot defective memory cells arising from SDRAM processing. In this study, we have fabricated ONO antifuses consisted of PIP structure. The antifuse shows a high resistance more than several G Ω in the normal state, and shows a low resistance less than 500 Ω after program. The program resistance variation according to temperature shows the very stable value of $\pm$20 Ω. At this time, its program voltage shows 6.7∼7.2 V and the program is performed within 1 second. Therefore this result shows that the PIP antifuse is a very stable and programmable logic device.

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Indoor Environment Control System based EEG Signal and Internet of Things (EEG 신호 및 사물인터넷 기반 실내 환경 제어 시스템)

  • Jeong, Haesung;Lee, Sangmin;Kwon, Jangwoo
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.11 no.1
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    • pp.45-52
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    • 2017
  • EEG signals that are the same as those that have the same disabled people. So, the EEG signals are becoming the next generation. In this paper, we propose an internet of things system that controls the indoor environment using EEG signal. The proposed system consists EEG measurement device, EEG simulation software and indoor environment control device. We use data as EEG signal data on emotional imagination condition in a comfortable state and logical imagination condition in concentrated state. The noise of measured signal is removed by the ICA algorithm and beta waves are extracted from it. then, it goes through learning and test process using SVM. The subjects were trained to improve the EEG signal accuracy through the EEG simulation software and the average accuracy were 87.69%. The EEG signal from the EEG measurement device is transmitted to the EEG simulation software through the serial communication. then the control command is generated by classifying emotional imagination condition and logical imagination condition. The generated control command is transmitted to the indoor environment control device through the Zigbee communication. In case of the emotional imagination condition, the soft lighting and classical music are outputted. In the logical imagination condition, the learning white noise and bright lighting are outputted. The proposed system can be applied to software and device control based BCI.

The Activation Plan of Chain Information Network And Efficent NDB Design (효율적인 NDB 설계 및 유통 정보 NETWORK 활성화 방안)

  • 남태희
    • KSCI Review
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    • v.1 no.2
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    • pp.73-94
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    • 1995
  • In this paper, design of efficient NDB(Network Data Base) for the activation plan of chain information network. The DB structure build up, logical structure, store structure, physical structure, the data express for one's record, and the express using linked in the releation of data. Also express as hierarchical model on the DSD(Data Structure Diagram) from the database with logical structure. Each node has express on record type, the linked in course of connective this type, the infuence have efficent of access or search of data, in the design for connection mutually a device of physical, design for database, and construction a form of store for logical. Also activation of chain information network of efficent, using POS(Point Of Sale) system in OSI(Open Systems Interconnection) environment for network standardization, and build up network a design for system.

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New vibration control device and analytical method for slender structures

  • Takabatake, Hideo;Ikarashi, Fumiya
    • Earthquakes and Structures
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    • v.4 no.1
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    • pp.11-39
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    • 2013
  • Since slender structures such as utility poles, radio masts, and chimneys, are essentially statically determinate structures, they often collapse during earthquakes. Although vibration control is the most logical method for improving the earthquake resistance of such structures, there are many practical problems with its implementation due to their very long natural vibration period. This paper proposes a new vibration control device to effectively prevent the collapse of slender structures subjected to strong earthquakes. The device consists of a pendulum, an elastic restraint and a lever, and is designed such that when it is attached to a slender structure, the second vibration mode of the structure corresponds to the first vibration mode of the same structure without the device attached. This is highly effective in causing the transverse motions of the device and the structure to oppose each other and so reduce the overall transverse vibration during an earthquake. In the present paper, the effectiveness of the vibration control device is first evaluated based on laboratory experiments and numerical studies. An example of applying the device to a tall chimney is then simulated. A new dynamic analytical method for slender structures with abrupt rigidity variations is then proposed.

Survey on the virtual commissioning of manufacturing systems

  • Lee, Chi G.;Park, Sang C.
    • Journal of Computational Design and Engineering
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    • v.1 no.3
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    • pp.213-222
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    • 2014
  • This paper reviews and identifies issues in the application of virtual commissioning technology for automated manufacturing systems. While the real commissioning of a manufacturing system involves a real plant system and a real controller, the virtual commissioning deals with a virtual plant model and a real controller. The expected benefits of virtual commissioning are the reduction of debugging and correction efforts during the subsequent real commissioning stage. However, it requires a virtual plant model and hence still requires significant amount time and efforts. Two main issues are identified, the physical model construction of a virtual device, and the logical model construction of a virtual device. This paper reviews the current literature related to the two issues and proposes future research directions to achieve the full utilization of virtual commissioning technology.