• Information Display
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• v.23 no.4
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• pp.29-34
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• 2022

• Information Display
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• v.24 no.5
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• pp.22-34
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• 2023

• Bulletin of the Korea Photovoltaic Society
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• v.7 no.1
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• pp.33-49
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• 2021

• Information Display
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• v.23 no.3
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• pp.22-29
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• 2022

• KIPE Magazine
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• v.24 no.2
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• pp.70-73
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• 2019

• Journal of Sensor Science and Technology
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• v.31 no.6
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• pp.441-447
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• 2022

This study describes a novel method for detecting and measuring partial discharge (PD) on an electrical facility such as an insulated power cable or switchgear using fiber optic sensing technology, and a distributed acoustic sensing (DAS) system. This method has distinct advantages over traditional PD sensing techniques based on an electrical method, including immunity to electromagnetic interference (EMI), long range detection, simultaneous detection for multiple points, and exact location. In this study, we present a DAS system for PD detection with performance evaluation and experimental results in a simulated environment. The results show that the system can be applied to PD detection.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.32 no.6
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• pp.477-482
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• 2019

This study investigated the influence of the viscoelastic property of slag when producing glass fiber, MFS631 with 60% of manganese slag, 30% of steel slag, and 10% of silica stone. To fabricate the MFS631 glass bulk, slag materials were placed in an alumina crucible, melted at $1,550^{\circ}C$ for 2 h, and then annealed at $600^{\circ}C$ for 2 h. It was found that glass is non-crystalline through X-ray diffraction analysis. MFS631 fiber was produced at speed in the range of 100~300 rpm at $1,150^{\circ}C$. The loss modulus (G") and storage modulus (G') of the produced glass fiber were evaluated at high temperatures. G' and G" of MFS631 were greater than $893^{\circ}C$, and the modulus value was 136,860 pa. This is similar to the results of a general E-glass fiber graph. Therefore, it was concluded that its spinnability is similar to that of E-glass fiber; therefore, it can be commercialized.

• The Optical Journal
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• s.148
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• pp.38-40
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• 2013

한국광기술원 초정밀광학연구센터가 지난 10월 24일 'Technical Roadshow 2013'을 열었다. 이날 행사는 한국광학기기산업협회 정진호 수석부회장, 과학기술연합대학원대학교(UST) 이은우 총장, 한국산업기술평가관리원 LED 광 연구개발 담당 오대곤 PD, 이오시스템 이원승 전 회장, 한국산업기술진흥원 김강호 박사, 대호테크 정영화 대표를 포함해 총 150여 명이 참석한 가운데 성황리에 개최됐다.

• Korean Journal of Materials Research
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• v.28 no.12
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• pp.714-718
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• 2018

Anti-reflection thin films are fabricated on glass substrates using the screen printing method. Tetra ethyl silicate(TEOS) and methyl tri methoxy silane(MTMS) are used as starting materials and buthyl carbitol acetate(BCA) and buthyl cellusolve(BC) are mixed to improve the viscosity of the solution. Anti-reflection thin films are fabricated according to the number of the screen mesh and the characteristics improve as the mesh size increases. The transmittance and reflectance of the coated thin film using 325 mesh are about 94 % and 0.43 % in the visible wavelength. The thickness and refractive index of the AR thin film are 107 nm and n = 1.26, respectively.

• Bulletin of the Korea Photovoltaic Society
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• v.4 no.3
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• pp.8-13
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• 2018