• 대한전자공학회논문지
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• 제7권2호
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• pp.13-20
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• 1970

진행파형 메이저에 사용할 수 있는 테이프 메안더라인의 지연방정식을 전자계의 쌍대성에 의하여 유도하였다. 프린트동판을 포토칭하여 메안더라인을 제작하였으며, 메안더라인의 공극폭, 테이프폭, 회로폭의 변화에 따른 지연곡선의 변화를 상위브릿지 방법으로 측정하여 이론곡선과 비교고찰하였다.

• Journal of electromagnetic engineering and science
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• 제11권4호
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• pp.290-297
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• 2011

Recent progresses in the live electrooptic imaging (LEI) technique are reviewed with emphasis on its functionality of real-time visual accesses to traveling electric waves in the GHz range. Together with the principles, configurations, and procedures for the visual observation experiments by an LEI camera system, the following results are described as examples indicating the wide application ranges of the technique; Ku-band waves on arrayed planar antennas, waves on a Gb/s-class digital circuit, W-band waves traveling both in slab-waveguide modes and aerially, backward-traveling wave along composite right/left-handed transmission line, and, waves in monolithic microwave integrated circuit module case.

• 한국군사과학기술학회지
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• 제14권3호
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• pp.405-413
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• 2011

Defense Systems Test Center in ADD supports increasingly various missile test requirements such as higher altitude event, multi target operation and low-altitude, high velocity target tracking. In this paper, we have proposed the development of instrumentation radar tracking status simulator based on virtual reality. This simulator can predict the tracking status and risk of failure using several modeling algorithms. It consists of target model, radar model, environment model and several algorithms includes the multipath interference effects. Simulation results show that the predict tracking status and signal are similar to the test results of the live flight test. This simulator predicts and analyze all of the status and critical parameters such as the optimal site location, servo response, optimal flight trajectory, LOS(Line of Sight). This simulator provides the mission plan with a powerful M&S tool to rehearse and analyze instrumentation tracking radar measurement plan for live flight test at DSTC(Defense Systems Test Center).

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.285-285
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• 2009

Due to a development of a modem technology as Power Line Communication(PLC) over 200 Mbps, the high-speed multi-media data trasmission could be currently possible. In This paper we develop a high quality media transmitter-receiver based on merging the HomePlug AV, which is 200 Mbps class PLC technology and HDMI Interface technology. Smart Live 6 software were used for the assessment of audio property. As the result of measurement of the HD class images by capturing from the receiver of the PLC, the quality of images couldn't be confirm any deterioration, which has compared with original reflections. In case of audio part as the result of confirmation of the Phase, Magnitude, it has been confirmed that over 90% of nomal transmition and receiving of acoustic signal.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 춘계학술대회 논문집 유기절연재료 방전 플라즈마
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• pp.18-22
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• 2000

The partial discharge testing is widely used in insulation property measurement because it gives low stress to high voltage equipment which is undertaken tests. Therefore it is very useful method compare to previous destructive methods and effective diagnosis method in power transformer that requires live-line diagnosis. But partial discharges have very complex characteristics of discharge pattern so it is required continuous research to development of precise analysis method. In recent, the study of partial discharge is carrying out discover of initial defect of power equipment through condition diagnosis and system development of degradation diagnosis using HFPD(High Frequency Partial Discharge) detection. In this study, simulated transformer is manufactured and HFPD occurred from transformer is measured with broad band antenna in real time, the degradation grade of transformer is analyzed through produced patterns in simulated transformer according to applied voltages.

• 전기학회논문지
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• 제59권1호
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• pp.192-196
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• 2010

Due to a development of a modem technology as Power Line Communication(PLC) over 200 Mbps, the high-speed multi-media data trasmission could be currently possible. The strength of the PLC has no more additional wiring work. PLC has also possible to high quality data transmission with currently electrical cable. It has a various strong point campare with existing wire and wireless communication technologies. In This paper we develop a high quality media transmitter-receiver based on merging the HomePlug AV, which is 200 Mbps class PLC technology and HDMI Interface technology. The video function was used for the VEDEO TEST GENERATOR in order to a property valuation. Smart Live 6 software were used for the assessment of audio property. As the result of measurement of the HD class images by capturing from the receiver of the PLC, the quality of images couldn't be confirm any deterioration, which has compared with original reflections. In case of audio part as the result of confirmation of the Phase, Magnitude, it has been confirmed that over 90% of nomal transmition and receiving of acoustic signal. It can be possible to have HD class Media service through the PLC.

• 한국미생물·생명공학회지
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• 제49권2호
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• pp.157-166
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• 2021

The probiotic market is constantly continuing to grow, concomitantly with a widening in the range and diversity of probiotic products. Probiotics are defined as live microorganisms that provide a benefit to the host when consumed at a proper dose; the viability of a probiotic is therefore of crucial importance for its efficacy. Many products undergo lyophilization for maintaining their shelf-life. Unfortunately, this procedure may damage the integrity of the cells due to stress conditions during both the freezing and (vacuum-) drying process, thereby impacting their functionality. We propose a lysine-based mixture for rehydration of freeze-dried probiotics for improving their viability during in vitro simulated gastric and duodenum stress conditions. Measurement of the zeta potential served as an indicator of cell integrity and efficacy of this mixture, while functionality was estimated by adhesion to a human enterocyte-like Caco-2 cell-line. The freeze-dried bacteria exhibited a significantly different zeta potential compared to fresh cultures; however, this condition could be restored by rehydration with the lysine mixture. Recovery of the surface charge was found to influence adhesion ability to the Caco-2 cell-line. The optimum lysine concentration of the formulation, designated "Zeta-bio", was found to be 0.03 M for improving the viability of Lactiplantibacillus plantarum Lp-115 by up to 13.86% and a 7-strain mixture (400B) to 41.99% compared to the control rehydrated with distilled water. In addition, the lysine Zeta-bio formulation notably increased the adherence ability of lyophilized Lp-115 to the Caco-2 cell-line after subjected to the in vitro stress conditions of the simulated gastrointestinal tract passage.

• 정보처리학회논문지B
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• 제11B권4호
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• pp.509-516
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• 2004

의미기반 이미지 검색에서의 의미적 내용 인식은 주석 위주의 텍스트 정보를 이용하는 것이 일반적이다. 이러한 텍스트 정보 기반 이미지 검색은 전통적인 검색 방법인 키워드 검색 기술을 그대로 사하여 쉽게 구현할 수 있으나, 텍스트의 개념적 매칭이 아닌 스트링 매칭이므로 주석 처리된 단어와 정확한 매칭이 없다면 검색할 수 없는 단점이 있었다. 이에 본 논문에서는 Ontology의 일종인 WordNet을 이용하여 깊이, 정보량, 링크 타입, 밀도 등을 고려한 단어간 의미 유사도를 측정하여 패턴 매칭의 문제점을 해결하고자 한다. 또한, 이미지의 컬러 분포 유사도를 측정하여 저차원 특징과 결합한 의미적 이미지 검색이 가능하도록 설계하였다. 제안된 검색 방안에 대해 'Microsoft Design Gallery Live'의 주석을 포함한 이미지를 대상으로 실험한 결과, 기존 의미기반 검색 시스템보다 향상된 결과를 확인하였다.

• Transactions on Electrical and Electronic Materials
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• 제10권6호
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• pp.222-226
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• 2009

The objective of this study is to share multimedia contents included in existing digital devices and to solve the problems of an increase in installation fees and non-environmentally friendly interiors. This study designed a new digital signal transmitter and receiver using power line transmission and HDMI in order to solve the problems in the existing systems. The transmitter and receiver designed in this study used an AD9867BCPZ PLC chip in which the transmission came from digital signals originating in a PC, and the system architecture was configured so that the outputs signals were connected to a TV from the receiver. The experiment was implemented by adding a Video Test Generator, a USBPre external sound card, and Smaart Live 6 for analyzing the characteristics of the configured system. In the video test results, it was verified that communication was actively implemented, and the image quality showed a constant level from the measurement of the captured video. In the case of the sound, it was verified that more than 90% of the sound signals were normally transmitted and received from the examination of their phases and magnitudes. Thus, the performance of the system designed in this study was verified, which leads to the resolution of some of the problems found in current digital devices.

• 대한토목학회논문집
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• 제28권6A호
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• pp.799-808
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• 2008

국내 교통 현실을 반영한 중(重)차량에 대한 하중 분석은 케이블 교량의 유지관리시 잔존수명 예측을 위한 피로하중모델 개발이나 교량의 설계시 해석에 필요한 활하중 모델 개발시 반드시 필요하다. 이에 본 연구에서는 강합성 사장교 상부구조 하면에 설치된 변형률 센서에서 측정한 신호를 이용하여 교량을 주행하고 있는 중차량의 하중정보를 얻기 위하여, 인공신경망 및 영향선을 이용한 차량하중분석시스템을 개발하였다. 인공신경망의 학습과 테스트를 위한 데이터 확보에 있어서 이론적인 수치 시뮬레이션을 통하지 않고, 실제 교량을 주행하는 임의 차량에 대해 직접 측정한 데이터를 이용하였다. 또한, 학습된 신경망의정확도를 검증하기 위하여 3종류의 시험재하차량을 반복 주행시켜 구한 값과 계량소에서 측정한 정적 값을 비교하였다. 교량의국부거동을 고려하기 위하여 가로보를 이용하였고, 인공신경망을 이용한 방법과 영향선을 이용한 방법의 분석결과를 비교한 결과, 인공신경망이론을 적용한 분석방법이 하중 판별의 정확도에 있어서는 영향선 분석방법보다 높은 정확도를 얻을 수 있었다.