• 대한임베디드공학회논문지
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• 제2권2호
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• pp.95-100
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• 2007

Recently ubiquitous application services are developed plentifully using RFID techniques in the field of distribution and security industries. However, except these field the applications using RFID are not mature yet. In this study, we proposed a real-time context service model of the u-conference based on the real-time contextual information acquired from conference and exposition. With collection of real-time contextual information for u-conference, the model can provide a lot of information services on the state of session attendee, doorway control, affairs, user certification, presentation progress etc. For the verification of proposed real-time context service model of u-conference, we design and implement the conference progress state service included the state of session attendee, user certification and presentation progress etc. This service provides the presentation state information included the current presenter, the paper list, the number of session attendee, the schedule and place of each session using the collecting RFID tag and the related information.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 사면안정 학술발표회
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• pp.60-76
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• 2000

Early detection in real-time response of slope movements ensures tremendous saving of lives and repair costs from catastrophic disaster Therefore, it is essential to constantly monitor the performance and integrity of slope-stabilizing structures such as Rock bolt, Nail and Pile during or after installation. We developed a novel monitoring system using Fiber Bragg Grating (FBG)sensor. It's advantages are highly sensitivity, small dimension and electro-magnetic immunity. capability of multiplexing, system integrity, remote sensing - these serve real-time health monitoring of the structures. Real-time strain measurement by the signal processing program is shown graphically and it gives a warning sound when the monitored strain state exceeds a given threshold level so that any sign of abnormal disturbance on the spot can be easily perceived.

• 한국정보과학회논문지:소프트웨어및응용
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• 제28권12호
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• pp.921-929
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• 2001

PCL(Object Constraint Language)은 UML, 메타모델을 정밀하게 명세화하기 위해서 UML 의미론의 도큐먼트에 사용되어졌다. 피리고 UMLl-은 실시간 UML 웹 개발 UML 등과 같이 다양한 시스템을 개발하기 위해서 확장되었다. 특히 실시간 시스템을 개발할 때 적시성, 동시성, 예측성, 신뢰성이 고려되어야 한다 이에 따라 실시간 UML을 정밀하게 표현하고 구현을 쉽게 하기 위해서 OCL을 사용해야 하지만 현재의 OCL로 실시간을 묘사하기에는 부적합하다. 본 논문에서는 실시간 시스템을 개발하는데 있어서 실시간 언어고 쉽게 변환이 가능하도록 이벤트 위주로 실시간 OCL을 제안하였고 그 효용성의 검증으로서 권선기 시뮬레이터 개발에 응용하였다.

• 제어로봇시스템학회논문지
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• 제14권3호
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• pp.263-272
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• 2008

We implemented a real-time servo system for a manipulator based on Laser Range Finder (LRF). and established algorithms for grasping a moving cylinder. We devised a manipulator mechanism and driving hardware based on a system board equipped with Xscale Processor with real-time operating system RTAI on Linux. The manipulator motor driver is connected to the system board via CAN communication link, and LRF is connected via RS-232C. We implemented real-time software including CAN device driver, RS-232C device driver, manipulator trajectory generator, and LRF control software. A typical application experiment for grasping a cylinder with circle motion demonstrated our system's real-time performance.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제9권2호
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• pp.94-98
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• 2009

This paper proposes an architecture of a real-time EtherCAT master library called RtEML. The controls EtherCAT slaves under EtherCAT protocol in real-time. It provides a simple programming interface which is useful in developing robot application in C/C++ or C#. To achieve deterministic, hard real-time control in Microsoft Windows environment without additional hardware, INtime is used. Since INtime is designed specifically to take advantage of the powerful capabilities of the x86 processor architecture, the proposed RtEML achieves microseconds of real-time performance.

• 제어로봇시스템학회논문지
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• 제18권3호
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• pp.251-257
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• 2012

Unmanned ground vehicles have important military, reconnaissance, and materials handling application. Many of these applications require the UGVs to move at high speeds through uneven, natural terrain with various compositions and physical parameters. This paper presents a framework for high speed autonomous navigation based on the integrated real time traversability. Specifically, the proposed system performs real-time dynamic simulation and calculate maximum traversing velocity guaranteeing safe motion over rough terrain. The architecture of autonomous navigation is firstly presented for high-speed autonomous navigation. Then, the integrated real time traversability, which is composed of initial velocity profiling step, dynamic analysis step, road classification step and stable velocity profiling step, is introduced. Experimental results are presented that demonstrate the method for a $6{\times}6$ autonomous vehicle moving on flat terrain with bump.

• 한국멀티미디어학회논문지
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• 제25권2호
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• pp.325-334
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• 2022

Digital twin has the advantages of quality improvement and cost reduction, so it is widely applied to various industries. In this paper, a method to implement the major technologies of digital twin easily and quickly is presented. These include data management and relay servers, real-time monitoring applications including remote control interfaces, and direct connection protocols for video streaming. In addition, an algorithm for controlling a two-wheeled vehicle with a 2D interface is also proposed. The implemented system performs near real-time synchronization between the real environment and the virtual space. The delay time that occurs in remote control of the vehicle in the real environment was compared with the results of applying the proposed delay time reduction method. In addition, in the case of 2D interface-based control, an algorithm that can guarantee the user experience was implemented and applied to the actual environment and verified through experiments.

• 한국멀티미디어학회논문지
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• 제17권4호
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• pp.478-489
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• 2014

Recently, flood damage by frequent localized downpours in cities are on the increase on account of abnormal climate phenomena and growth of impermeable area by urbanization. In this study, we are focused on flooding on roads which is the basis of all means of transportation. To calculate real-time accumulated rainfall on a road link, we use the Coefficient of Correlation Weighting method (CCW) which is one of the revised methods of missing rainfall as we consider a road link as a unobserved rainfall site. CCW and real-time accumulated rainfall entered through the Internet are used to estimate the real-time rainfall on a road link. Together with the real-time accumulated rainfall, flooding history, rainfall range causing flooding of a road link and frequency probability precipitation for road design are used as factors to determine the Flood Risk Index on roads. We simulated two cases in the past, July, 7th, 2009 and July, 15th, 2012 in Busan. As a result, all of road links included in the actual flooded roads at that time got the high level of flood risk index.

• 한국정보처리학회논문지
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• 제7권12호
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• pp.3804-3814
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• 2000

본 논문에서는 실시간 객체 모델인 TMO(Time-triggered Message-triggered Object)에 기반을 둔 실시간 객체지향 프로그램의 시간 제약이 제대로 만족되는가를 시스템 수행 중에 감시하기 위한 모니터의 효과적인 구현 방안에 대하여 논한다. 구현 환경으로 윈도우 OS상의 TMO 프로그램 실행 환경인 WTMOS(Windows TMO System)를 이용하였고, 감시 주체가 되는 수행 시간 모니터의 성능 분석을 위하여 온도 제어를 위한 응용 시스템이 구축되었다. 모니터 대상과 모니터 조건을 TMO 프로그램내에 명시하는 방법과 정의된 모니터의 기능을 WTMOS 내부와 TMO 형태의 응용 객체로 분산시켜서 적은 비용으로 시스템을 구축하는 방법을 제시한다.

• 지능정보연구
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• 제15권3호
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• pp.103-118
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• 2009

계속적으로 빠르게 변화하는 통신환경에 대처하기 위하여 통신 기업은 운영상에 일어날 수 있는 이상 event들을 빠르게 발견하고 이를 운영요원에게 실시간으로 알려주는 시스템의 도입이 필요하게 되었다. 이러한 실시간 프로세스관리 시스템은 또한 통신회사들이 제공하는 다양한 새로운 서비스들을 빠르게 수용할 수 있어야 한다. 본고에서는 실시간으로 통신망 운용관리 프로세스를 모니터링하고 분석할 수 있는 프로세스관리 시스템을 설계 및 개발한다. 이러한 목표를 이루기 위하여 본고는 통신망 운용관리 분야의 국제표준으로 인정된 Enhanced Telecom Operations Map (eTOM)을 기반으로 하여 application 및 database 구조를 설계하며 이를 바탕으로 실시간 종합 프로세스 상태 모니터링, 실시간 작업상태 모니터링, 조직별 오더 모니터링 등 총 8가지 기능을 구현한다. 이 8가지 기능은 서비스 지향구조로 개발되었으며 따라서 다양한 새로운 서비스들이 이전보다 빠른 속도로 개발될 수 있게 설계 되었다. 또한 실시간으로 프로세스를 관리함으로써 이상 event들을 빠른 속도로 발견할 수 있게 되었다. 마지막으로 이 시스템은 국제 표준기반으로 설계되어짐으로써 다양한 환경 즉 통신망 운용환경이 다른 지역이나 회사에서도 빠르게 개발될 수 있는 flexibility를 가지고 있다. 본 연구는 통신망 운용관리나 또는 다른 분야의 실시간 프로세스관리 시스템을 도입할 필요가 있는 연구자나 실무자에게 좋은 지침이 될 것으로 기대된다.