• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.9
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• pp.4186-4192
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• 2012

Because wind turbines are larger and more off-shore construction due to economic and environmental factors, it is more difficult to access the wind turbine as well as the necessary parts and the maintenance costs are increasing. So, we need to minimize fault elements and to prevent a secondary accident at failure through monitoring to reduce maintenance costs and to increase reliability of operation. In this paper we have implemented ZigBee based wireless sensor nodes and network for wind turbine condition monitoring using temperature, humidity, voltage, current, wind direction, and wind speed sensors. ZigBee wireless sensor nodes signals are transmitted to a central monitoring system via routers. Also, the sensor signals are collected and processed using LabVIEW program to monitor the wind turbine conveniently. The administrators and users can monitor the condition of wind turbine at remote site in real time over TCP/IP.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.490-494
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• 2007

The chemical process plant information is used and updated during design, construction, operation, and maintenance of plant. This special type of information should be utilized as the DW(datawarehouse) which conforms to the standard format. The DW should be design in consideration of connectivity to application softwares. The application softwares are different from each other in the context of their objects such as design, management, decision-making, and so on. In this paper, some considerable facts in dealing with chemical process plant information on the framework of developing application software including datawarehousing, model building, interfacing. As a case study, the development of decision-making support system for environmental policy is illustrated for the related discussion.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06d
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• pp.191-195
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• 2008

센서 노드 미들웨어는 다양한 센서 응용 소프트웨어와 운영체제 및 네트워크 기능 사이에 존재하며, 유지보수, 설치, 배포, 응용 수행에 필요한 제반 사항을 지원하며, 센서 노드에 탑재되어 센서 네트워크의 프로그램 갱신, 응용 변화에 따른 프로그래밍 조정을 수행한다. 본 논문에서는 센서 노드 미들웨어가 센서 노드의 응용 모듈을 동적으로 재구성하기 위한 방법으로 속성 값 단위의 동적 재구성 기법을 제안한다. 제안하는 기법은 센서 노드의 응용 모듈을 변경해야 할 필요가 있을 경우, 응용 모듈과 관련된 속성의 값을 변경시켜 줌으로써 응용 모듈을 재구성하는 방법이다. 논문에서는 제안하는 동적 재구성의 개념과 동적 재구성을 위한 프로세스 및 알고리즘을 설명한다. 제시하는 기법은 각처에 설치되어 동작중인 센서 노드들을 무선 통신을 이용하여 재구성함으로써 직접 센서 노드들을 떼어내거나 동작을 중단시키지 않고도 재구성함으로써 운영의 편의를 도모할 수 있는 효과가 있다. 또한 속성 값을 통한 동적 재구성방법을 통하여 용량이 큰 이미지 파일 전송으로 인한 통신 오버헤드를 줄이고 그로인해 배터리 소모를 줄 일수 있다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.12
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• pp.3594-3599
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• 2009

The train control system used in Gyeongbu-line is classified in ATC, IXL and CTC. The ATC data related to speed and space control for trains are transmitted from wayside to onboard by way of UM71 AF track circuits and BSP Loop. The information transferred by track circuits is composed of operation data which directly influence to the train operation and the information transferred by BSP Loop is used in the section which requires the additional data transmission about the particular track-side environment such as tunnel, hot box detector or insulated section. In this paper, for the BA type turning unit of the UM71 AF track circuits which is mainly used in the linking section of existing and high-speed lines from the opening of the Gyeongbu line till the present, we not only analyze the characteristics of BA but also compare and analyze baseline values and the measured values. With this analysis, we will be able to propose how to solve the problems about operation and maintenance such as track circuit malfunctions of the relevant sections.

• Journal of the Korean Society for Railway
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• v.19 no.5
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• pp.609-616
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• 2016

The Passenger Service Equipment(PSE) provide various train operation data such as flag station data. When PSE incur service failures or errors, passengers who use the train feel great inconvenience. In this paper, I have chosen PSE that were important to passengers and have applied Reliability Centered Maintenance(RCM), deviating from the existing perspective that operators have taken to perform RCM. FMEA/FMECA was performed for reliability analysis of the PSE. The highly critical device among the PSE is defined as the Passenger Information Control System(PICS), which is used to control the automatic announcement and signaling board. Through Weibull distribution of the PICS, failure analysis was performed. Based on the analyzed results, I have proposed a solution that will minimize service failure of PICS.

• Journal of the Institute of Convergence Signal Processing
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• v.22 no.1
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• pp.1-6
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• 2021

Recently, unmanned facilities have been introduced and operated in a way that reduces the cost and development of IT technology. Although unmanned facilities have advantages in terms of efficiency and economy, they have disadvantages such as failure of unmanned facilities and malfunctions, causing damage to facilities caused by intruders, and information leakage. In addition, it is necessary to visit the person in charge at all times to inspect the unmanned facilities, resulting in management costs. In this paper, we designed a system that checks the status of unmanned surveillance facilities in real time to check and automatically recover problems such as malfunctions, and to notify managers of situations by text messages in real time. The system to be designed consists of an integrated network video server (NVR) that receives and determines information on the operation status of the main equipment such as video, sound, and lighting, and a real-time text message using an SMS server.

• Journal of the Korean Association of Geographic Information Studies
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• v.13 no.1
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• pp.35-49
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• 2010

KEPCO(Korean Electric Power Corporation) is now operating an incorporated system for designing and maintenance of electric power facilities called NDIS (New Distribution Information System). Given the structure of the nation which exclusively permits establishment of new electric facilities and maintenance, expertise (skilled knowledge) about the related system on the part of electric engineers is very important. But in the view of education and training, it is a reality that current offline ways of education based on application for educational courses at the KEPCO Academy, an education organization under KEPCO, are unsatisfactory in efficiency and availability to related engineers. Therefore, We realize that a simulation design education system which guarantees an easy access is required to make the best of the existing system NDIS. For this purpose the present work is a study on the development of a simulation education system to make local based NDIS real on the web, which enables related engineers to practice designing and get feedback of the result.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2006.06a
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• pp.159-181
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• 2006

본 연구에서는 청주와 그 인근 지역에서 정보시스템을 개발하거나 운영하고 있는 업체의 IS 실무자들에게 (1) IS 실무자의 업무 수행 성과, (2) 소프트웨서 및 IT 전문기술수준, (3) IS 지식 및 능력 수준, 그리고 (5) 재교육 수요에 대해서 설문 조사하였다. 본 연구의 조사 대상자들은 주로 Sl(system integration) 업체에 종사하는 IT(information technology) 실무자들과 e-Business를 수행하는 일반 기업에서 전산 업무를 담당하고 있는 실무자들이며, 구체적으로는 전산시스템 운영자, 시스템/데이터베이스 분석/설계자, 어플리케이션/웹 프로그래머, 최종사용자 지원 담당자, e-Business를 위한 IT 지원 인력 등이다. 조사 결과는 다음과 같다. 충북 지역에서 IS 실무자들은 자신들의 업무를 성공적으로 수행하기 위한 지식 및 기술의 다양한 영역에서 광범위하게 지식 및 기술의 결핍을 느끼고 있으며, 자신의 업무 성과가 전반적으로 좋지 않다고 판단하고 있고, 업무 관련 지식 및 기술에 대한 재교육의 필요성을 강하게 느끼고 있다. 또한, 충북 지역의 IS 실무자들은 주된 활동이나 업무가 시스템 개발과 유지보수, 최종 사용자 지원 등의 활동이며, 이에 대한 최신의 기술과 고객 중심의 시각화된 도구(GUI)를 제공하는데 많은 시간을 투자하며, 기존의 반복적인 개발 업무에서 점차 경력이 쌓임에 따라 고객 중심적인 새로운 시스템 개발을 위한 기획과 관리에 많은 관심을 기울이고 있으나, 조직 운영 및 의사결정 등과 같은 기술/지식들에는 낮은 관심을 보였다. IT전문 기술들 중 IS 실무자들이 필요로 하고 보유해야 한다고 응답한 기술들은 대다수가 웹 개발에 관련된 기술이며, IS 실무자들은 대규모 프로젝트의 수행에 필요한 공동 작업 수행 능력의 제고와 그를 위한 재교육에 높은 관심을 나타내었다. 본 조사는 충북의 IS 실무자들을 위한 대학 교육과 재교육을 포함하는 최적의 평생 교육계획 수립을 위한 기초적이고 필수적인 정보를 제공할 것으로 기대된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.4
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• pp.27-34
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• 2017

In recent years, major security data such as research data and confidential documents have been leaked to the outside due to the carelessness of the companies and research institutes performing IT related services such as information technology projects and research and development of financial institutions, companies and public institutions is. Leakage cases are caused by leakage of personal information due to lack of security management of information system maintenance companies, such as unauthorized leakage or storage of related materials in outsourcing service process. In this paper, we analyzed the types and management status of service business through the environmental survey of corporate informatization business and analyzed the problems in development and maintenance using external service companies. Furthermore, in this paper, we provide an information system service that focuses on the business activities based on the items considered, and at the same time, it provides the informatization service for companies that can prevent infiltration of viruses and hacking from the outside. This paper presents a methodology for enhancing security for the system construction.

• Journal of the Korea institute for structural maintenance and inspection
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• v.12 no.4
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• pp.195-202
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• 2008

Underestimation of the capacity can have serious economic consequences, as deficient bridges must be posted, repaired or replaced. Accurate prediction of bridge behavior may allow for more bridges to remain in service with or without minor repairs. The presented research is focused on the reliability evaluation of the actual load carrying capacity of existing bridges based on the field testing. Reliability analysis is performed on 17 previously tested bridges. Bridges are first evaluated based on the code specified values and design resistance. However, after the field testing program, it is possible to apply the experimental results into the bridge reliability evaluation procedures. The girder distribution factors obtained from the tests are also applied in the reliability calculation. The results indicate that the reliability indices of selected bridges can be significantly increased due to the reduction of uncertainties without sacrificing the safety of structures, by including the result of field measurement data into calculation.