• Smart Structures and Systems
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• 제16권6호
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• pp.1147-1167
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• 2015

Wireless smart sensors, which have become popular for monitoring applications, are an attractive option for implementing structural control systems, due to their onboard sensing, processing, and communication capabilities. However, wireless smart sensors pose inherent challenges for control, including delays from communication, acquisition hardware, and processing time. Previous research in wireless control, which focused on semi-active systems, has found that sampling rate along with time delays can significantly impact control performance. However, because semi-active systems are guaranteed stable, these issues are typically neglected in the control design. This work achieves active control with smart sensors in an experimental setting. Because active systems are not inherently stable, all the elements of the control loop must be addressed, including data acquisition hardware, processing performance, and control design at slow sampling rates. The sensing hardware is shown to have a significant impact on the control design and performance. Ultimately, the smart sensor active control system achieves comparable performance to the traditional tethered system.

• 안보군사학연구
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• 통권2호
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• pp.261-283
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• 2004

To build up the military strength based on information oriented armed forces, the Korean ministry of national defense (MND) promotes the defense CALS (Continuous Acquisition and Life cycle Support) initiative for the reductions of acquisition times, improvements of system qualities, and reductions of costs. These defense CALS activities are the major component of the underlying mid and long term defense digitization program and the ultimate goal of program is to bring a quick victory by providing real-time battlefield intelligence and the economical operations of the military. The concept of defense CALS is to automate the acquisition and disposition of defense systems throughout their life cycle. For implementing defense CALS, the technology for exchange and sharing CALS standard data that is created once and used many times should be considered. In order to develop an efficient CALS information exchange and sharing system, it is required to integrate distributed and heterogeneous data sources and provide systematic search tools for those data. In this study, we developed a content based search engine technology which is essential for the construction of integrated data environments. The developed technology provides the environment of sharing the CALS standard data such as SGML(Standard Generalized Markup Language) and STEP(Standard for The Exchange of Product model data). Utilizing this technology, users can find and access distributed and heterogeneous data sources without knowing its actual location.

• International Journal of Internet, Broadcasting and Communication
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• 제8권1호
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• pp.64-68
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• 2016

These fields are integrated to visualize and finalize the proposed development, in simulation environment. SCADA (supervisory control and data acquisition) systems and distributed control systems (DCSs) are widely deployed in all over the world, which are designed to control the industrial infrastructures, in real ways. To supervise and control the various parts of designed systems; trends to require a deep knowledge to understand the overall functional needs of industries, which could be a big challenge. Industrial field devices (or network sensors) are usually distributed in many locations and are controlled from centralized site (or main control center); the communication provides various signs of security issues. To handle these issues, the research contribution will twofold: a method using cryptography is deployed in critical systems for security purposes and overall transmission is controlled from main controller site. At controller site, multimedia components are employed to control the overall transmission graphically, such as system communication, bytes flows, security embedded parameters and others, by the means of multimedia technology.

• 한국정밀공학회지
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• 제31권4호
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• pp.297-301
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• 2014

The biggest factors, which lower the machining accuracy of machine, are thermal deformation and chatter vibration. In this article, we introduce the development case of a device and technology that can automatically compensate thermal deformation errors of machine during long-time processing on the machine tool's CNC (Computerized Numerical Controller) in real time. In machine processing, the data acquisition of temperature signal in real time and auto-compensation of the machine origin of machine tools depending on thermal deformation have significant influence on improving the machining accuracy and the rate of operation. Thus, we attempts to introduce the related contents of the development we have made in this article : The development of a device that embedded the acquisition part of temperature data, linear regression to get compensation value, compensation model of neural network and a system that compensates the machine origin of machine tool automatically during manufacturing process on the CNC.

• Korean Journal of Hydrosciences
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• 제2권
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• pp.99-113
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• 1991

Integrated irrigation management system (IIMS) that is incorporated with a microcomputer-based decision support system (DSS) has been developed and applied to paddy rice irrigation systems management. The system hardwares consist of field data acquisition units, data transmission units, central data processing units, and printing and displaying units. Ridld data to be collected include incremental rainfall, streamflow and reservoir water levels, and water levels at several irrigation canal sections within an irrigation sidtricts. The softwares are to process field data, real-time forecasting, irrigation control data, and decision variables from data-base and simulation model subsystems. And the user-interface subsystems are incorporated to present the water system operators and managers the results from data and model sugsystems. User-friendly menu with animated graphic modules are adopted to help understand irrigation controls for the district. This paper issues the overal descriptions of DSS as applied to Anjuk irrigation district. The details of major model components for the irrigation controls are presented along with real-time data collection systems. The potentials of DSS have been appraised very practical and promising for better irrigation system operation and management.

• Journal of Communications and Networks
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• 제14권6호
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• pp.597-605
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• 2012

With the smart grid coming near, wide-area supervisory control and data acquisition (SCADA) becomes more and more important. However, traditional SCADA systems are not suitable for the openness and distribution requirements of smart grid. Distributed SCADA services should be openly composable and secure. Event-driven methodology makes service collaborations more real-time and flexible because of the space, time and control decoupling of event producer and consumer, which gives us an appropriate foundation. Our SCADA services are constructed and integrated based on distributed events in this paper. Unfortunately, an event-driven SCADA service does not know who consumes its events, and consumers do not know who produces the events either. In this environment, a SCADA service cannot directly control access because of anonymous and multicast interactions. In this paper, a distributed security framework is proposed to protect not only service operations but also data contents in smart grid environments. Finally, a security implementation scheme is given for SCADA services.

• International journal of advanced smart convergence
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• 제6권3호
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• pp.38-44
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• 2017

Currently, wired gables have been installed or portable storage devices have been installed for data acquisition of flying drone. In this paper, we propose a technology to transmit data wirelessly by sensing information such as battery discharge value, acceleration, and temperature by attaching RF sensor to a drone. The purpose of this paper is to design and develop the monitoring technology of agriculture drone battery usage in real time using RF sensor. In this paper, we propose a monitoring system that can check real time data of battery changed value, temperature, and acceleration during pesticide control activity of agricultural drone.

• Spatial Information Research
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• 제11권1호
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• pp.41-60
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• 2003

책자형태의 대학시설물 도면에서 공간정보의 부정확, 도면의 유지보수의 한계, 현장에서 유지보수 등 작업과 GIS-DB구축간에 이원화된 작업으로 인한 경제적 비효용 등이 문제점으로 지적되어왔다 본 연구에서는 이러한 문제에 대한 대안을 제시하기 위해 시설물 도면을 현장 실무자가 작업현장에서 실시간으로 입·출력하는 시스템의 도입가능성을 평가하고자 하였다. 제안된 기법은 무선 네트워크, 이동 컴퓨팅 등의 최근 정보 통신 환경의 변화 동향을 바탕으로 PDA를 기반으로 하여 작업현장에서 도면을 수정·갱신할 수 있는 실시간 Mobile GIS를 상정하였다. 구축된 시스템을 평가하기 위한 기준에는 다양한 관점이 있을 수 있으나 본 연구에서는 대학시설물 관리자가 기존의 시스템에서 직면한 문제를 해소할 수 있는 지 여부에 주안점을 두고 3종류의 품질 평가기준이 도출되었다: (1) 데이터 검색 (2) 공간분석 (3) 실시간 데이터 갱신. 실제 서비스를 수행하면서 평가기준에 의거 시스템의 가능성을 검증하여 보았다. 본시스템을 이용함으로써 현지 작업인력이 시설물 점검 등 관련업무에서 보다 정확한 위치정보를 확보할 수 있게 되었다. 아울러 작업과정에서 다양한 도면을 실시간으로 직접 확인하여 현재 시설물 상황과 비교함으로서 시설물의 시·공간적 변화 추이를 반영한 공간분석이 이루어질 수 있었다. 또한 이동 컴퓨팅에 의거한 시스템을 통해 작업현장에서 실시간으로 GIS 데이터베이스를 구축할 수 있게 되었다. 본 연구는 실제적인 실시간 Mobile GIS 도입을 위한 개념 및 요구 사항, 구조, 동작 모델에 대해 향후 무선통신 등 관련 기술이 일반화되었을 경우를 대비한 기초연구를 수행하였다는데 큰 의의가 있을 것이다. 본 연구가 전통적인 책자도면 기반의 대학시설물 관리의 한계를 극복할 수 있는 계기가 되어 적은 인력과 예산으로도 대학시설물에 대하여 표준화된 실시간 GIS구축에 중요한 참고자료가 될 수 있을 것으로 사료된다.

• 융합신호처리학회논문지
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• 제12권4호
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• pp.315-321
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• 2011

선박이나 함정에서 일반적으로 사용되는 SONAR 신호용 CRT 모니터 디스플레이 시스템은 벡터 주사 방식을 사용한다. 그래서 시스템의 처리회로가 복잡하고, 부품 생산이 폐쇄되어 부품 수급이 어렵고 가격이 고가이다. FPGA 기반 임베디드 프로세서 시스템은 회로를 단순화함과 더불어 코어설계를 쉽게 재구성함으로써 각종 응용 적용에 유연하고, 저가격대로 고속 성능을 제공한다. 본 논문은 기존 CRT시스템의 문제점을 극복하기 위해서 FPGA 임베디드 프로세서 시스템을 사용하여 SONAR 신호 LCD 디스플레이 시스템을 구현하였다. 제안한 접근법은 기존 시스템에 비해 X-Y 편향과 CRT 제어 블록을 FPGA 임베디드 프로세서 시스템으로 대체함으로써 시스템 구성의 단순성과 유연성을 확보할 수 있고, 또한 저가격화를 가능하게 한다. 구현된 시스템은 SONAR 신호를 실시간으로 획득하고 LCD에 디스플레이하는 것이 가능하다.

• Journal of Astronomy and Space Sciences
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• 제25권4호
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• pp.471-480
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• 2008

통신해양기상위성 송수신자료전처리시스템은 정지계도 기상/해양관측영상을 지상에서 수신하여 실시간 전처리를 수행하고, 처리된 영상과 기타 자료들을 국제권고 규격 형태로 위성을 통해 사용자들에게 배포하는 역할을 담당한다. 또한 국가 기상/해양위성센터와 위성운영센터 세 곳에 설치되어 24시간/365일 자동 운영될 예정이다. 서브시스템 레벨과 서브시스템간 접속 시험을 2008년 상반기에 완료하고 통합된 운영 환경에서 기능, 성능 및 운영 측면의 요구사항을 만족 여부를 검증하는 송수신자료전처리시스템의 통합시험을 수행하였다. 이 논문에서는 송수신자료전처리시스템의 통합시험 목적, 준비 과정, 주요 결과 등을 소개한다.