• 한국컴퓨터정보학회논문지
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• 제4권4호
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• pp.177-184
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• 1999

TMN체계에서 GDMO(Guidelines for the Definition of Managed Object) 에이전트 플랫폼(Agent Platform)은 망 요소의 운영 상태와 자원들을 GDMO 표준에 따라 관리객체(Managed Object : MO)로 모델링 하고. 자원들의 상태를 유지하면서 관리자(manager)로 부터의 망관리 기능 요구에 따라 조작된다. 이러한 GDMO 에이전트의 기본 기능을 지원하기 위해 13가지의 시스템 관리 기능(System Management Function : SMF)이 구현되어져야 한다. 이 13가지의 시스템 관리 기능들 중 사건-보고-관리 기능(Event-Report-Management Function)은 모든 시스템 관리 기능에 관련되어진다. 그 이유는 지속적인 장비들과의 통신을 통하여 관리자(manager)측으로 즉각적인 자원들의 상태에 대한 보고가 일어나야 하기 때문이다. 본 논문에서는 효율적인 사건 보고 관리 기능을 위하여 장비(real resource)들과의 통신을 위한 몇 가지 방법에 대한 분석을 행하고 여기서 제시되는 문제점 향상을 위해 RRMC(Real Resource Message Coordinator)구조의 새로운 자원 감시 기법을 제안한다.

• 한국빅데이터학회지
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• 제3권1호
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• pp.55-62
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• 2018

본 연구에서는 그동안 해외에서 주로 실행되어 왔던 빅데이터를 이용한 다양한 질병(독감, 폐렴, 수족구병) 환자수 예측 모델을 개발해 보았다. 기존의 환자수 예측이 병원에서 실제 환자수를 카운팅한 수를 수집하여 발표하는 시스템이라면, 이번에 개발한 연구 모델은 실시간으로 제공되는 질병 관련 단어 및 다양한 기후 데이터를 접목하여 기계학습 방법으로 알고리즘을 만들고, 이를 기반으로 정부에서 발표하기 전 환자수를 예측하는 모델이다. 특히 유행성 질병이 빠르게 확산될 경우, 실시간으로 전파 속도를 파악할 수 있다는 점에서 그 장점이 있다. 이를 위하여 구글 플루 트렌드에서 실패한 부분을 최대한 보완하여 다양한 데이터를 활용한 예측 모델을 개발하였다.

• Journal of Mechanical Science and Technology
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• 제20권5호
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• pp.658-667
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• 2006

Fractional derivative models, which are used to describe the viscoelastic behavior of material, have received considerable attention. Thus it is necessary to put forward the analysis solutions of dynamic systems containing a fractional derivative. Although previously reported such kind of fractional calculus-based constitutive models, it only handles the particularity of rational number in part, has great limitation by reason of only handling with particular rational number field. Simultaneously, the former study has great unreliability by reason of using the complementary error function which can't ensure uniform real number. In this paper, a new approach is proposed for an analytical scheme for dynamic system of a spring-mass-damper system of single-degree of freedom under general forcing conditions, whose damping is described by a fractional derivative of the order $0<{\alpha}<1$ which can be both irrational number and rational number. The new approach combines the fractional Green's function and Laplace transform of fractional derivative. Analytical examples of dynamic system under general forcing conditions obtained by means of this approach verify the feasibility very well with much higher reliability and universality.

• 한국자동차공학회논문집
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• 제9권6호
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• pp.143-151
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• 2001

During the past several years, the major interests of car manufacturers in development of automatic transmission were in durability and shift quality. However, a large number of researches for improving shift quality that are based on dynamic characteristics of shifting mechanism have been rarely adopted in the developing process because it is quite difficult to predict the shifting performance from the dynamics simulation. One of the important reasons for the difference between simulation results and experiments arises from the automatic transmission hydraulic system that consists of many valves with high order model and shows a lot different dynamics to temperature variation. In this work, hardware-in-the-loop simulation system for automatic transmission was developed f3r improving the accuracy of simulated result by combining the real-time simulation model with the real hydraulic system. The real-time simulation for automatic transmission model excluding hydraulic system is executed with TI's TMS320C31 DSP and the interfacing board which includes 12bit A/D, PWM signal generator and driver, serial driver ,etc is designed for acquiring the simulation data and signal interface with hydraulic system. We verified the proper operation and correctness of shifting result by comparing the off-line simulation result with that of HILS and experimental result which was performed on transmission dynamometer driven by electric motor.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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• pp.665-665
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• 2005

The existing DSP for utility interactive photovoltaic generation system control generally uses floating point process type. Because it is easy to use for number crunching, however, it is too late and too expensive. Fixed point process DSP TMS320F2812, has high control speed and is rather inexpensive. A very complicated real system can be simulated using hardware-in-the-loop (HIL) system in a virtual environment Therefore, HIL system can speed up research and development process with a little effort. Also current DSP for utility interactive photovoltaic generation system adopts floating point process type, which is easy to use for number crunching. However, fixed point process DSF, TMS320F2812, has high control speed and is rather inexpensive. This paper presents more efficient method for MPPT control using TMS320F2812 along with HIL System.

• 한국인터넷방송통신학회논문지
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• 제9권6호
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• pp.101-109
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• 2009

공단지역이나 오폐수 발생 지역에서 발생하는 악취로 인해서 주민들이 불편을 겪고, 해당 지방자치 단체에 민원을 제기하는 일이 빈번히 발생하고 있다. 최근 악취 발생 가능성이 있는 지역을 관내 많이 보유한 지방자치 단체들은 악취 발생 여부를 모니터링하고 필요시 원격으로 현장의 공기를 포집하는 명령을 내릴 수 있는 서비스를 요구하고 있다. 본 논문에서는 악취 센서 및 기상 센서 값을 실시간으로 모니터링 및 제반 장치 관리 업무를 웹 브라우저상에서 수행할 수 있는 시스템을 제안한다. 본 시스템은 기존 시스템과는 달리 사용자의 위치에 구애받지 않고 여러 대의 장치를 동작시키고 관리할 수 있는 기능을 제공한다. 또한, 본 시스템의 블랙보드기반 다중 프로세스 구조는 시스템 사용 중에 필요성을 느낀 새로운 소프트웨어 모듈을 쉽게 통합할 수 있도록 한다. 우리의 시스템을 실험한 결과, 사용 편리성면에서 사용자 만족도가 높았다. 우리의 시스템은 현재 한 지방자치단체의 악취 발생 예정 지역에서 운영되고 있다.

• Nuclear Engineering and Technology
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• 제54권2호
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• pp.770-780
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• 2022

In 1993 the University of Extremadura initiated the design, construction and management of the Radiological Alert Network of Extremadura (RAREx). The goal was to acquire reliable near-real-time information on the environmental radiological status in the surroundings of the Almaraz Nuclear Power Plant by measuring, mainly, the ambient dose equivalent. However, the phased development of this network has been carried out from two points of view. Firstly, there has been an increase in the number of stations comprising the network. Secondly, there has been an increase in the number of monitored parameters. As a consequence of the growth of RAREx network, large data volumes are daily generated. To face this big data paradigm, software applications have been developed and implemented in order to maintain the indispensable real-time and efficient performance of the alert network. In this paper, the description of the current status of RAREx network after 30 years of design and performance is showed. Also, the performance of the graphing software for daily assessment of the registered parameters and the automatic on real time warning notification system, which aid with the decision making process and analysis of values of possible radiological and non-radiological alterations, is briefly described in this paper.

• 대한임베디드공학회논문지
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• 제13권1호
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• pp.9-15
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• 2018

This paper describes the applicability of Bluetooth and ZigBee networks for real-time control in wireless networked control system and suggests an effective usage of them. The Bluetooth SCO link, SPP and HID profiles and the ZigBee non-beacon enabled network are analyzed and the latency of them are measured. A number of wireless networked control system experiments are performed via DC motor control system and the various profiles of Bluetooth and ZigBee in real-time wireless networked control system are compared.

• 전력전자학회논문지
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• 제21권1호
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• pp.72-79
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• 2016

Uninterruptible power supplies are extensively used as backup power in various applications such as telecommunication systems, Internet data centers, hospitals, and military technologies. Some of these applications require a considerable number of batteries, and the maintenance of such batteries is critical for the reliability of a system. However, batteries are chemical energy storage devices that deteriorate over time and frequently inspecting their performance and suitability is difficult. A real-time remote battery inspection system that applies electrochemical impedance spectroscopy is proposed and implemented in this study. The proposed system consists of a small inspection circuit and software for control. The former is developed to monitor the impedance variation of the battery and to diagnose its state. The validity and feasibility of the proposed system is proven by experimental results.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 추계 학술논문 발표대회
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• pp.57-58
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• 2018

The number of deaths in the korean construction industry is more than three times the OECD average. Although safety management system should be improved to prevent the safety accidents, it is difficult to improve due to domestic safety conditions. Especially, in order to prevent accidents at construction sites, there is an increasing tendency to monitor the movement of workers and equipment in real time by introducing a location positioning system. Therefore, this study proposes a system that can monitor the position of workers and heavy equipments in real - time, detect danger and transmit alarms so that workers can pay attention to safety and keep safety. The system is expected to reduce safety accidents by transmitting alarms to workers so that they can pay attention.