• Title/Summary/Keyword: Subsystem Interface

Search Result 86, Processing Time 0.022 seconds

Smart PZT-interface for wireless impedance-based prestress-loss monitoring in tendon-anchorage connection

  • Nguyen, Khac-Duy;Kim, Jeong-Tae
    • Smart Structures and Systems
    • /
    • v.9 no.6
    • /
    • pp.489-504
    • /
    • 2012
  • For the safety of prestressed structures such as cable-stayed bridges and prestressed concrete bridges, it is very important to ensure the prestress force of cable or tendon. The loss of prestress force could significantly reduce load carrying capacity of the structure and even result in structural collapse. The objective of this study is to present a smart PZT-interface for wireless impedance-based prestress-loss monitoring in tendon-anchorage connection. Firstly, a smart PZT-interface is newly designed for sensitively monitoring of electro-mechanical impedance changes in tendon-anchorage subsystem. To analyze the effect of prestress force, an analytical model of tendon-anchorage is described regarding to the relationship between prestress force and structural parameters of the anchorage contact region. Based on the analytical model, an impedance-based method for monitoring of prestress-loss is conducted using the impedance-sensitive PZT-interface. Secondly, wireless impedance sensor node working on Imote2 platforms, which is interacted with the smart PZT-interface, is outlined. Finally, experiment on a lab-scale tendon-anchorage of a prestressed concrete girder is conducted to evaluate the performance of the smart PZT-interface along with the wireless impedance sensor node on prestress-loss detection. Frequency shift and cross correlation deviation of impedance signature are utilized to estimate impedance variation due to prestress-loss.

A Water Quality Management System at Mokhyun Stream Watershed Using GIS and RS (GIS와 RS를 이용한 목현천 수질관리 정보체계)

  • Lee, In Soo;Lee, Kyoo Seock
    • Journal of Environmental Impact Assessment
    • /
    • v.8 no.4
    • /
    • pp.1-12
    • /
    • 1999
  • The purpose of this study is to develop a Water Quality Management System(WQMS), which calculates pollutant discharge and forecasts water quality with a water pollution model. Operational water quality management requires not only controlling pollutants but acquiring and managing exact information. A GIS software, ArcView 3.1 was used to enter or edit geographic data and attribute data, and Avenue Script was used to customize the user interface. PCI, a remote sensing software, was used to derive land cover classification from 20 m resolution SPOT data by image processing. WQMS has two subsystems, database subsystem and modelling subsystem. The database subsystem consisted of watershed data from digital maps, remote sensing data, government reports, census data and so on. The modelling subsystem consisted of NSPLM(NonStorm Pollutant Load Model) and SPLM(Storm Pollutant Load Model). It calculates the amount of pollutant and predicts water quality. These two subsystems were connected through a graphic display module. This system has been calibrated for and applied to Mokhyun Stream watershed.

  • PDF

Auxiliary Power Interface Design for Power Control and Distribution Unit (전력조절분배기의 보조전원 설계)

  • Park, Sung-Woo;Jang, Jin-Beak;Park, Hee-Sung;Yoon, Hee-Kwang
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2009.10a
    • /
    • pp.239-242
    • /
    • 2009
  • Power Control and Distribution Unit (PCDU) plays roles of power generation control for solar array panel, power storage control for battery system, power conversion for unregulated and regulated primary bus and power distribution to bus and payload system. The selection and design of the proper auxiliary power interface for PCDU depending on various mission is one of the most important step for electrical power subsystem design. In this paper, the general design approach of auxiliary power interface for PCDU which can be used for small-sized LEO satellites application is given. And, the auxiliary power design concept for always alived modules such as solar array regulator and house keeping module is also suggested.

  • PDF

Data Management and Communication Networks for Man-Machine Interface System in Korea Advanced Liquid MEtal Reactor : Its Functionality and Design Requirements

  • Cha, Kyung-Ho;Park, Gun-Ok;Suh, Sang-Moon;Kim, Jang-Yeol;Kwon, Kee-Choon
    • Proceedings of the Korean Nuclear Society Conference
    • /
    • 1998.05a
    • /
    • pp.291-296
    • /
    • 1998
  • The DAta management and Communication NETworks (DACONET), Which it is designed as a subsystem for Man-Machine Interface System of Korea Advanced LIquid MEtal Reactor(KALIMER MMIS) and advanced design concept is approached, is described. The DACONET has its roles of providing the real-time data transmission and communication paths between MMIS systems, providing the quality data for protection, monitoring and control of KALIMER and logging the static and dynamic behavioral data during KALIMER operation. The DACONET is characterised as the distributed real-time system architecture with high performance, Future direction, in which advanced technology is being continually applied to Man-Machine interface System Development of Nuclear Power Plants, will be considered for designing data management and communication networks of KALIMER MMIS

  • PDF

Design and Development of an Alarm Gathering Interface Equipment for ATM Switching System (ATM 시스템 경보 취합 장치 설계 및 개발)

  • Yang, Chung-Ryeol;Kim, Jin-Tae
    • The Transactions of the Korea Information Processing Society
    • /
    • v.3 no.7
    • /
    • pp.1845-1857
    • /
    • 1996
  • An alarm gathering interface equipment has been developed to collect the hardware failure activities in 1$1, 024\times1, 024$ ATM switching system. The equipment use 8-bit microprocessor and ELA-232C port, and is fabricated in a single board, which called Alarm Gathering Interface board Assembly(AGIA). It is programmed to ensure flexibility in modification and expansion of the system capability. The performance is successfully proved through communication test with hardware blocks or modules consisting a ATM switching system, these techniques can be used to develop operation and maintenance functions for more superior ATM switching system in the near future. we additionally have presented some items for further study on alarm subsystem often ATM switching system.

  • PDF

Implementation and performance evaluation of the communications module of TNAS in the advanced CPS (대용량 통신처리시스템의 전화망 정합 장치의 통신 모듈 구현 및 성능 분석)

  • 김건석;조평동
    • Journal of the Korean Institute of Telematics and Electronics S
    • /
    • v.34S no.7
    • /
    • pp.9-18
    • /
    • 1997
  • In this paper, we implemented the communication module in the Telephone Network Access Subsystem(TNAS) of the Advanced Communications Processing System(ACPS). We defined some kinds of communication tasks and related resources like several queues which are executed in real-time operating system, and implemented the procedures for processing the user information. Through traffic modeling and simulation, the performance of the Service Processing board Assembly(SPA) is evaluated in the aspets of system utilization and buffer size. The ACPS should accommodate various public networks such as public switch telephone network, packet switchen data network, frame realy netork, and ATM network. The communications module proposed in this paper could be used inthe interface beween the SPA and the High Speed Network Adaptor of other network interface subsystems.

  • PDF

Development of Integrated Planning System for Efficient Container Terminal Operation (효율적인 컨테이너 터미널 운영 계획 작성을 위한 통합 시스템 개발)

  • 신재영;이채민
    • Journal of Intelligence and Information Systems
    • /
    • v.8 no.2
    • /
    • pp.71-89
    • /
    • 2002
  • In this paper, an integrated planning system is introduced for the efficient operation of container terminal. It consists of discharging and loading planning, yard planning, and berth scheduling subsystem. This interface of this system is considered for user's convenience, and the rule-based system is suggested and developed in order to make planning with automatic procedures, warning functions for errors.

  • PDF

Implementation of Web Based Teleradiology Internet PACS (웹 기반 원격 방사선 인터넷 PACS 구현)

  • 지연상;이성주
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.4 no.5
    • /
    • pp.1105-1110
    • /
    • 2000
  • In the past high cost and complex system configuration often discouraged hospitals from building teleradiology system or PACS(Picture Archiving and Communication System). But new standard platforms enable us to construct the same system with very low cost and simple configurations. internet as a communication channel made us overcome the regional limit and communication cost, and WWW technologies simplified the complex problems on the software developments, configurations and installations. So whoever has a Web browser to access internet can review medical images at anywhere. And we adopted DICOM technology which is a standard for medical imaging, thus we could resolve the interface problems among medical imaging systems such as modalities or archives. The implementation is comprised of three part DICOM/WWW interface subsystem, image format conversion subsystem and viewing applets which are displayed on users WWW browsers. In addition, Teleradiology intrenet PACS system includes DICOM converter that non-DICOM file format converts standard file format.

  • PDF

A Converged Profile and Authentication Control Scheme for Supporting Converged Media Service (융합 미디어 서비스 제공을 위한 통합 프로파일 및 인증제어 기술 연구)

  • Lee, Hyun-Woo;Kim, Kwi-Hoon;Ryu, Won
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.35 no.3B
    • /
    • pp.503-516
    • /
    • 2010
  • In this paper, we propose the converged profile and authentication scheme for supporting converged media services of broadcasting & communications convergence in fixed mobile convergence networks. The proposed scheme supports the management of access, service, mobility and IPTV profiles on subscriber and a function of open API(Application Program Interface) for providing the subscriber profile for the third party service provider with the PUSH/PULL method. The open API is based on a web service and a REST(Representational State Transfer) and provides various services for the third party service provider with ease. In addition, the proposed scheme supports a function of SSO(Single Sign-on). After user succeeded in establishing an access connection, user can sustain the same authentication state with this function although connected access network is changed or IMS(IP Multimedia Subsystem) service network is attached. We evaluate and analyze the performance of the proposed scheme through the implementation of CUPS(Converged User Profile Server) system test-bed.