• Journal of Korea Society of Industrial Information Systems
• /
• v.11 no.5
• /
• pp.78-85
• /
• 2006

Thanks to the spacial and timely flexibility of laboratory's environment, the distance learning based real time PLC education system has been brought into relief as a next generation laboratory alternative. The developed system was installed using a relatively cheap PLC and PC camera. Providing image feedback through the PC camera, the system provides the student's interests of the lab as well as an opportunity to monitor the lab's activities and results.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2015.10a
• /
• pp.211-213
• /
• 2015

SSD 등과 같이 다양한 성능을 가진 저장 장치가 개발되고 안정화 됨에 따라 분산 파일 시스템에서 다양한 저장 장치를 활용하기 위한 연구가 많이 진행되고 있다. 특히, 바이오 응용에서 대용량 분석에서 높은 IOPS가 요구가 증대되고 있으며, 이를 해결하기 위해 분산 파일 시스템에서 SSD 장치 등을 활용하는 것이 필요해지고 있다. 하지만 단순히 SSD만 사용한다고 해서 분산 파일 시스템의 성능이 빨라지는 것은 아니다. 오히려, 비용 대비 성능 상의 이점이 없을 수 있다. 본 논문에서는 대표적인 바이오 응용을 활용해 SSD와 HDD 융합 시험을 통해 분산 파일 시스템에서 SSD 활용에 대한 효과를 살펴보았다.

• Journal of Institute of Control, Robotics and Systems
• /
• v.10 no.1
• /
• pp.66-72
• /
• 2004

To assess tunnel safety, cracks in tunnel lining are measured by inspectors, who observe cracks with their naked eyes and record them. But manual inspection is slow, and measured crack data is subjective. Therefore, this study proposes inspection system fur measuring cracks in tunnel lining and providing objective crack data to be used in safety assessment. The system consists of On-vehicle system and Laboratory system. On-Vehicle system acquires image data with line CCD camera on scanning along the tunnel lining. Laboratory system extracts crack information from the acquired image using image processing. Measured crack information is crack thickness, length and orientation. To improve accuracy of crack recognition, the geometric properties and patterns of cracks in concrete structure were applied to image processing. The proposed system was verified with experiments in both laboratory environment and field environment such as subway tunnel.

• Proceedings of the Korean Information Science Society Conference
• /
• 2008.06b
• /
• pp.515-519
• /
• 2008

관점 지향 프로그래밍은 구조적 프로그래밍, 객체 지향 프로그래밍 등 기존 프로그래밍 방법론에서 모듈화하지 못한 여러 요구사항에 걸쳐 있는 부가적인 요구사항을 모듈화 할 수 있는 방법을 제공한다. 모듈화 하기 어려운 요구 사항을 횡단 관심으로 분류하고, 이를 애스펙트 단위로 모듈화하여 재사용성을 극대화시키는 관점 지향 프로그래밍은 새로운 프로그래밍 패러다임으로 활발하게 연구가 진행 중이다. 본 논문에서는 현재 비즈니스 및 분산 컴퓨팅 환경에서 많이 이용되는 워크플로우 표준 언어인 BPEL에 워크플로우 서비스의 전이조건의 재사용성을 극대화하기 위해 관점 지향 프로그래밍 기술을 적용한 워크플로우 서비스 시스템을 제안한다. 본 시스템은 워크플로우에 존재하는 독립적인 웹 서비스들이 실행조건으로 요구하는 동일한 정보에 대한 재사용성의 극대화 방법을 제공하는 장점을 가진다.

• 제어로봇시스템학회:학술대회논문집
• /
• 2003.10a
• /
• pp.1794-1797
• /
• 2003

We developed a web-based virtual laboratory system for electronic circuit experiments on the client/ server distributed environment. Through our virtual laboratory, the learners will be capable of learning the concepts and theories related to electronic circuit experiments and how to operate the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power suppliers. The proposed virtual laboratory system is composed of four important components: Principle Classroom to explain the concepts and theories of electronic circuit operations, Virtual Experiment Classroom to provide interactive multimedia contents about the syllabus of off-line laboratory class, Assessment Classroom, and Management System. With the aid of the Management System every classroom is organically tied together collaborating to achieve maximum learning efficiency. We have obtained several affirmative effects such as high learning standard, reducing the total experimental hours and the damage rate for experimental equipments.

• Journal of Power Electronics
• /
• v.16 no.2
• /
• pp.685-694
• /
• 2016

This paper presents a reliability assessment model for the power semiconductors used in wind turbine power converters. In this study, the thermal loadings at different timescales of wind speed are considered. First, in order to address the influence of long-term thermal cycling caused by variations in wind speed, the power converter operation state is partitioned into different phases in terms of average wind speed and wind turbulence. Therefore, the contributions can be considered separately. Then, in regards to the reliability assessment caused by short-term thermal cycling, the wind profile is converted to a wind speed distribution, and the contribution of different wind speeds to the final failure rate is accumulated. Finally, the reliability of an actual power converter semiconductor for a 2.5 MW wind turbine is assessed, and the failure rates induced by different timescale thermal behavior patterns are compared. The effects of various parameters such as cut-in, rated, cut-out wind speed on the failure rate of power devices are also analyzed based on the proposed model.

• Journal of Engineering Education Research
• /
• v.6 no.1
• /
• pp.56-64
• /
• 2003

In this paper, we designed and implemented a client/server distributed environment and developed a web-based virtual laboratory system for electronic circuits. Since our virtual laboratory system is implemented to describe the on-campus laboratory, the learners can obtain similar experimental data through it. The proposed virtual laboratory system is composed of four important components : Principle Classroom, Virtual Experiment Classroom, Evaluation Classroom and Overall Management System. Through our virtual laboratory, the learners will be capable of learning the concepts and theories related to electronic circuit experiments and how to operate the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power supplies. Also, every experimental activity occurred in our virtual laboratory is recorded on database and printed out on the preliminary report form. All of these can be achieved by the aid of the Management System. The database connectivity on the web is made by PHP and the virtual labol'atory environment is set up slightly differently for each learner. Finally, we have obtained several affirmative effects such as reducing the total experimental hours and the damage rate for experimental equipments and increasing learning efficiencies as well as faculty productivity.

• Proceedings of the Korean Institute of Communication Sciences Conference
• /
• 2004.11a
• /
• pp.301-301
• /
• 2004

• Proceedings of the KSRS Conference
• /
• 2002.10a
• /
• pp.827-831
• /
• 2002

MediaGIS is a concept of tightly integrated multimedia with spatial information. VideoGIS is an example of MediaGIS focused on the interaction or interaction of video and spatial information. Our suggested GeoVideo, a new concept of VideoGIS has its key feature in interactiveness. In GeoVideo, the geographic tasks such as browsing, searching, querying, spatial analysis can be performed based on video itself. GeoVideo can have the meaning of paradigm shift from artificial, static, abstracted and graphical paradigm to natural, dynamic, real, and image-based paradigm. We discuss about the integration of video and geography and also suggest the GeoVideo system design. Several considerations on expanding the functionalities of GeoVideo are explained for the future works.

• Journal of the Korea Society of Computer and Information
• /
• v.22 no.5
• /
• pp.97-103
• /
• 2017

In this paper, we propose a method to investigate the safety consciousness of a analyst incident response. This study conducted a statistical survey on 154 analysts who hired as expert in environment monitoring organizations in South Korea. The results of the analyses showed that respondents had good awareness on the equipment incident response and complied with laboratory safety regulations very well. Secondly, respondents were aware of the importance in the order of equipment incident response, an analytical laboratory incident response, and the cause of a chemical substance associated incident in an analytical laboratory in regarding the regulation compliance for creating a safe laboratory environment and the securement of laboratory safety. Therefore, (it was identified that) it would be necessary to create a safe environment and integrate a safety management system.