• Proceedings of the KIEE Conference
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• 2003.07e
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• pp.103-105
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• 2003

본 논문에서는 이동로봇의 마찰력 보상을 위해 퍼지 외란 관측자를 설계한다. 이동로봇은 주행 바닥면에 따라 주행 특성이 달라질 수 있다. 주행 중 발생하는 마찰력은 비선형적인 특성을 가지므로 이에 검출할 수 있는 퍼지 관측기를 설계하도록 한다. 설계된 퍼지 관측기를 적용함으로써 주행 바닥 면의 상태에 따라 발생하는 마찰력의 영향을 최소화시킴으로써 주행 특성을 효과적으로 개선시킬 수 있다.

• Proceedings of the KIEE Conference
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• 2004.07e
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• pp.17-20
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• 2004

This paper is presented for the development of the brushless DC(BLDC) motor for the spindle motor of hard disk drives. To design the spindle motors for HDD, it is very important to consider the reduction of vibration and noises. To design the each parts and investigate the assemble of a motor, we need to calculate the press force and size variation according to the press force. If we design the each parts without the consideration of the size variation, we can not get good result of assemble and performance with exact size of parts. In this paper, we get the computer simulation results to verify optimal size and assemble.

• Structural Monitoring and Maintenance
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• v.1 no.2
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• pp.159-171
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• 2014

Real-time near and far-field monitoring of concrete structural components gives enough information on the time and condition at which damage occurs, thereby facilitating damage detection while in the same time evaluate the cause of the damage. This paper experimentally investigates an integrated monitoring technique for near and far-field damage detection in concrete structures based on simultaneous use of electromechanical admittance technique in combination with guided wave propagation. The proposed sensing system does not measure the electromechanical admittance itself but detect time variations in output voltages of the response signal obtained across the electrodes of piezoelectric transducers bonded on surfaces of concrete structures. The damage identification is based on the spectral estimation MUSIC algorithm. Experimental results show the efficiency and performance of the proposed measuring technique.

• Journal of Science and Technology Studies
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• v.13 no.2
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• pp.111-136
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• 2013

Meeting and solving persistent societal problems and challenges through science, technology, and innovation is now an emerging policy agenda in Korea. This socially-oriented innovation needs integrated approach on technological and social innovation. This study aims to suggest the necessity of new process named 'socio-technical planning' and propose its characteristics and implications. It deals with some cases of socio-technical planning activity and classifies their characteristics and types. And then, this study suggests the direction of socio-technical planning development.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.697-698
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• 2008

This paper deals with finite element characteristic analysis of brushless DC motor according to magnetic property measurement methods. Magnetic property data for non-oriented (NO) electrical steel for electric motors are measured by the Epstein test which is considered as the international standards. Data from Epstein test may result in discrepancy from motor characteristic tests due to innate anisotropic property of NO electrical steel. Finite element analysis were performed for a BLDC motor by various measurement methods such as Epstein test, Ring test and single sheet test (SST), and calculated results were compared with considering anisotropic property conditions.

• IE interfaces
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• v.18 no.3
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• pp.308-316
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• 2005

Delayed repair to the failure of weapon system can cause enormous damages to military operation. Various materials like diagnostic equipment, general and special tools, technical manuals(maintenance manual and illustrated parts breakdown) and drawing documents are required for maintenance. For existing weapon systems the distributed environment of these various materials reduces the maintenance effectiveness of maintenance crew. In this paper, to provide the information of maintenance procedures and supply to the maintenance crew we develope a digital interactive electronic technical manual of the technical documents which can be used easily in computer through question and answer method and improve maintenance effectiveness and minimized repairing time.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.183-186
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• 2015

TV 시청 도중 세컨드 디바이스로 멀티태스킹하는 시청패턴과 더불어 방송과 시청자가 상호작용하는 양방향 서비스 요구사항의 증대에 따라 KBS 는 시청자 참여 서비스를 위한 티벗 서비스 플랫폼을 개발하였다. 티벗 서비스 플랫폼은 시청자의 피드백을 실시간으로 반영하여 방송 제작자의 요구 사항을 만족시키는 동시에 방송을 통해 시청자 간 소통을 강화할 수 있는 KBS 의 세컨드 스크린 서비스 플랫폼이다. 본 논문에서는 시청자 참여 서비스를 위한 티벗 세컨스크린 서비스 플랫폼의 전반적인 구조와 특징, 서비스 운용 현황에 대해 살펴본다.

• Journal of Power Electronics
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• v.13 no.4
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• pp.507-515
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• 2013

This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04b
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• pp.833-836
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• 2001

본 논문은 LonWorks 네트워크를 이용한 원격 홈오토메이션 시스템에 대해서 설명한다. 최근 홈네트워킹 개념의 확산에 따라 다양한 정보가전 기술의 발전이 가속화 되고 있다. 또한, 다양한 정보 가전 기기를 연동하기 위한 다양한 매체(IEEE1394, USB, PLC, TP, IRDA, BLUETOOTH 등)가 제시되고 있고 이를 제어하기 위한 미들웨어(Jini, Havi, LonWorks 등)가 거론되고 있다. 이러한 환경에서 가능한 서비스를 미리 살펴보고 이를 구성하기 위한 기본적인 요소 기술의 필요성을 살펴본다. 본 논문에서 설계한 원격 홈오토메이션 시스템은 제어 미들웨어에서 표준이 되고 있는 LonWorks를 이용하여 인터넷에서 홈내부의 디바이스를 모니터링 가능하도록 구축하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.545-548
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• 2005

최근 RSS(Really Simple Syndication)를 응용한 서비스가 해외는 물론 국내에서도 각 분야에서 다양하고 활발하게 연구 개발되고 있다. 국내외 RSS서비스 현황 및 사례조사를 통해 민간과 공공부문의 RSS 서비스 현황을 분석하고, 과학기술분야 지식정보의 특성을 고려하여 다양한 정보와 환경에 유연하게 대응할 수 있는 과학기술 지식정보 서비스를 위한 RSS기반 정보배급 표준시스템의 설계 방안을 제시하였다.