• Title/Summary/Keyword: Real - time

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Real-time evaluation of automatic production quality control for friction welding machine (摩擦熔接機械 의 自動생산品質制御 實時間 評價)

  • 오세규;임우조;김형자
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.9 no.6
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    • pp.757-766
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    • 1985
  • Both in-process quality control and high reliability of the weld is one of the major concerns in applying friction welding to the economical and qualified mass-production. No reliable nondestructive monitoring method is available at present to determine the real-time evaluation of automatic production quality control for friction welding machine. This paper, so that, presents the experimental examinations and statistical quantitative analysis of the correlation between the initial cumulative counts of acoustic emission(AE) occurring during plastic deformation period of the welding and the tensile strength of the welded joints as well as the various welding variables, as a new approach which attempts finally to develop an on-line (or real-time) quality monitoring system and a program for the process of real-time friction welding quality evaluation by initial AE cumulative counts. As one of the important results, it was well confirmed that the initial AE cumulative counts were quantitatively and cubically correlated with reliability of 95% confidence level to the joint strength of the welds, bar-to-bar (SCM4 to SUM31, SCM4 to SUM24L) and that an AE technique using initial AE counts can be reliably applied to real-time strength evaluation of the welded joints, and that such a program of the system was well developed resulting in practical possibility of real-time quality control more than 100% joint efficiency showing good weld with no micro-structural defects.

An Analysis on the Real-Time Performance of the IGS RTS and Ultra-Rapid Products (IGS RTS와 Ultra Rapid 실시간 성능 분석)

  • Kim, Mingyu;Kim, Jeongrae
    • Journal of Advanced Navigation Technology
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    • v.19 no.3
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    • pp.199-206
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    • 2015
  • For real-time precise positioning, IGS provides ephemeris predictions (IGS ultra-rapid, IGU) and real-time ephemeris estimates (real-time service, RTS). Due to the RTS data latency, which ranges from 5 s to 30 s, a short-term prediction process is necessary before applying the RTS corrections. In this paper, the real-time performance of the RTS correction and IGU prediction are compared. The RTS correction availability for the GPS satellites observed in Korea is computed as 99.3%. The RTS correction is applied to broadcast ephemeris to verify the accuracy of the RTS correction. The 3D orbit RMS error of the RTS correction is 0.043 m. Prediction of the RTS correction is modeled as a polynomial, and then the predicted value is compared with the IGU prediction value. The RTS orbit prediction accuracy is nearly equivalent to the IGU prediction, but RTS clock prediction performance is 0.13 m better than the IGU prediction.

Architecture Design for Real-time Mobile Embedded Software Test Tools (실시간 이동형 내장 소프트웨어 시험 도구의 구조 설계)

  • Kim, Sang-Il;Lee, Nam-Yong;Rhew, Sung-Yul
    • Journal of KIISE:Software and Applications
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    • v.33 no.4
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    • pp.388-401
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    • 2006
  • A tool for analyzing and testing software in real-time is required for the efficient development of highly reliable real-time mobile embedded software This too] requires various technologies, such as source code based white-box test and real-time system monitoring and control. The tool also should be designed to improve reusability and portability by considering the interaction with other kinds of real-time system. This paper identifies and analyzes the functional requirements for the test tool on real-time mobile embedded software and suggests an adequate tool architecture based on the collected requirements. It also suggests the specific implementation technology and architecture design pattern to support the tool's expandability and portability.

Concurrency Control Based on Triggering Relationship for Real-Time Active Database (실시간 능동 데이터베이스에서 triggering 관계를 고려한 동시성 제어 기법)

  • 홍석희
    • The KIPS Transactions:PartD
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    • v.8D no.1
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    • pp.10-23
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    • 2001
  • Transactions in real-time active databases have the notion of activeness where transactions are generated by external effects and another transaction. In this paper, we propose the multi version concurrency control algorithm for real-time active transactions. A real-time active transaction has a timing constraint in the form of a deadline until which the user wants to complete the transaction, and is characterized by triggering relationships which mean that association between a transaction that triggers the execution of another transaction and the triggered transaction. The triggering relationship is an important factor to resolve data conflicts among real-time active transactions. The proposed concurrency control mechanism resolves data conflicts by considering triggering relationships between conflicting transactions as well as priorities and precedence relationships. The conflict resolution mechanism considers association types of the triggering relationship such as abort and commit dependency, and then resolves data conflicts in favor of higher priority transactions. We also present the experimental results of our algorithm comparing other real-time active concurrency control algorithms.

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Design Scheme of A Micro Real-Time Control System with CAN and RTOS (CAN과 RTOS를 내장한 소형 실시간 시스템 설계 기법)

  • Lim, Young-Gyu;Kim, Dong-Seoung
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.5
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    • pp.207-215
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    • 2014
  • In this paper, we propose a Micro Real-Time Control System (MRTCS) for decreasing the delay during interrupts processing and data transfer on sensor nodes. The MRTCS consists of a control, sensor nodes based on Controller Area Network (CAN) device. The control node was designed with Real Time Operating System (RTOS) on top of the small Micro Control Unit (sMCU). Sensor nodes have the CAN device without sMCU, which have multiple Digital Inputs, Outputs (DI/DO) and the CAN controller. We have evaluated with OCTAVE v3.6.4 from open source for system performance. Simulation results show that the system performance was increased through the delay reducing for interrupt processing and internal data transfer. We verify that a proposed MRTCS approach will be adapted to various real-time control system.

Design and Implementation of Storage Manager for Real-Time Compressed Storing of Large Volume Datastream (대용량 데이터스트림 실시간 압축 저장을 위한 저장관리자 설계 및 구현)

  • Lee, Dong-Wook;Baek, Sung-Ha;Kim, Gyoung-Bae;Bae, Hae-Young
    • Journal of Korea Spatial Information System Society
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    • v.11 no.3
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    • pp.31-39
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    • 2009
  • Requirement level regarding processing and managing real-time datastream in an ubiquitous environment is increased. Especially, due to the unbounded, high frequency and real-time characteristics of datastream, development of specialized stroge manager for DSMS is necessary to process such datastream. Existing DSMS, e.g. Coral8, can support datastream processing but it is not scalable and cannot perform well when handling large-volume real-time datastream, e.g. 100 thousand over per second. In the case of Oracle10g, which is generally used in related field, it supports storing and management processing. However, it does not support real-time datastream processing. In this paper, we propose specialized storage manager of DSMS for real-time compressed storing on semiconductor or LCD production facility of Samsung electronics, Hynix and HP. Hynix and HP. This paper describes the proposed system architecture and major components and show better performance of the proposed system compared with similar systems in the experiment section.

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Real-Time Support on the Tablet PC Platform (태블릿 PC 환경의 실시간 처리 기능 지원)

  • Park, Ji-Yoon;Jo, Ah-Ra;Kim, Hyo-Joung;Choi, Jung-Hyun;Heo, Yong-Kwan;Jo, Han-Moo;Lee, Cheol-Hoon
    • The Journal of the Korea Contents Association
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    • v.13 no.11
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    • pp.541-550
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    • 2013
  • Generally in case of tablet PC's, the Windows 8 is used to support various functions or development convenience, however it cannot support real-time processing. In addition, existing commercial solutions and RTiK has a problem to support real-time processing due to impossibility of getting APIC timer count value which is used to generate timer interrupt separated from that of Windows. Thus, in this paper, we set the initial APIC count value using MSR_FSB_FREQ to support real-time processing on the Windows 8-based tablet PC's. Additionally, we deal with designing and implementing RTiK+ providing real-time processing to guarantee interrupt periods by controlling C-State which is used for low power techniques. To evaluate the performance of the proposed RTiK+, we measured the periods of generated real-time threads using RDTSC instructions which return the number of CPU clock ticks, and verified that RTiK+ operates correctly within the error ranges of 1ms.

Design of U-healthcare System for Real-time Blood Pressure Monitoring (실시간 혈압 모니터링 u-헬스케어 시스템의 설계)

  • Cho, Byung-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.18 no.4
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    • pp.161-168
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    • 2018
  • High blood pressure is main today's adult disease and existing blood pressure gauge is not possible for real-time blood pressure measurement and remote monitoring. But real-time blood pressure monitoring u-healthcare system makes effect health management. In my paper, for monitoring real-time blood pressure, an architecture of real-time blood pressure monitoring system which consisted of wrist type-blood pressure measurement, smart-phone and u-healthcare server is presented. And the analog circuit architecture which is major core function for pulse wave detection and digital hardware architecture for wrist type-blood pressure measurement is presented. Also for software development to operate this hardware system, UML analysis method and flowcharts and screen design for this software design are showed. Therefore such design method in my paper is expected to be useful for real-time blood pressure monitoring u-healthcare system implementation.

Development of Real-time Service Primitive in Message Handling System Supporting Desk-top Conferencing System (데스크탑 회의시스템 지원을 위한 메시지 처리 시스템의 실시간 서비스 프리미티브 개발)

  • 강승찬;김영준
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.2 no.2
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    • pp.169-180
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    • 1998
  • This research presents development of real-time service primitive in MHS(Message Hanling system) supporting desk-top conferencing system. Desk-top conferencing system is one of the real-time GC(Group Communication) services. The complexity of modem society has led to the consequent need for real-time GC between a number of people in order to jointly handle tasks in business, government and other forms of organization. Despite the many different form of desk-top conferencing systems developed to date, there are still few systems in widespred no. One of the biggest hurdle preventing the widespred adoption of real-time GC is the lack of agreement on user-friendly interchange environments. In distributed office environments, the MHS is one of the most widely used service for information interchange. It is a standard of electronic mail system which is concerned mostly with asynchronous exchange of short notes. It is clear that additional functions on MHS are necessary in order to allow users to properly process their real-time group messages and provide them with important facilities as a communication infrastructure for real-time GC.

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Design and Performance Analysis of Real-Time Hybrid Position Tracking Service System using IEEE 802.15.4/4a in the Multi-Floor Building (복합환경에서 IEEE 802.15.4/4a를 이용한 하이브리드 실시간 위치추적 서비스 시스템 설계 및 성능분석)

  • Kim, Myung-Hwan;Chung, Yeong-Jee
    • Journal of Information Technology Services
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    • v.10 no.1
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    • pp.105-116
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    • 2011
  • With recent spotlight on the, uniquitous computing technology, the need for object of indentification and location infrastructure has increased. Such GPS technolgy must utilize IEEE 802.15.4 Zigbee used for existing wireless sensor network infra as a basice element for user's context-awareness in a uniquitous environement, for effectiveness.Such real-time GPS service is provided in the internal environment where the user would actually are and most high-rise buildlings apply. Underthe assumption, the real-time GPS technology is seperated by each floor, and signals do not get transmitted to other floors, the application on one floor within the high-rise buildling was conducted. This study intends to suggest a floor detection algorithm using IEE 802.15.3/Zigbee's RSSI which supports the accuracy within a couple of meters for the user's the movement between the floors in high-rise buildings in a complex environment. It proposes an floor detection algorithm using IEEE 802.15.4/Zigbee's RSSI which provides accuracy within a radius of few meters for the users movement between the floors for real-time location tracking within high-rise building in a cmoplex environment. Furthermore, for more accurate real-time location tracking, it suggests an algorithm for real-time location tracking using IEEE 802.15.4a/Zigbee's CSS technology based on triangulation. Based on the suggested algorithm, it designs a hybrid real-time location tracking service system in a high-rise buildling and test its functions.