• Proceedings of the Korean Magnestics Society Conference
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• 2016.05a
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• pp.97-97
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• 2016

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.231.2-231.2
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• 2009

• Proceedings of the Korean Magnestics Society Conference
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• 2014.05a
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• pp.117-117
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• 2014

• Proceedings of the Korean Magnestics Society Conference
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• 2013.12a
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• pp.124-124
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• 2013

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.28 no.1
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• pp.1-9
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• 2017

In this paper, ETRI's $0.25{\mu}m$ GaN MMIC process is introduced and the fabricated results of X-Band 3 W power amplifier MMIC are discussed. The one-stage X-Band 3 W power amplifier MMIC using the $0.25{\mu}m$ GaN MMIC devices has been designed and fabricated. From the fabricated GaN MMIC, the characteristics of the $0.25{\mu}m$ GaN MMIC process and devices are evaluated and analyzed. The X-band power amplifier MMIC shows output power of 3.5 W, gain of 10 dB, and power-added efficiency of 35 %.

• ETRI Journal
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• v.31 no.6
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• pp.667-674
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• 2009

Terahertz time-domain spectroscopy has been used to study the optical and dielectric properties of three chalcogenide glasses: $Ge_{30}As_8Ga_2Se_{60}$, $Ge_{35}Ga_5Se_{60}$, and $Ge_{10}As_{20}S_{70}$. The absorption coefficients ${\alpha}({\nu})$, complex refractive index n(${\nu}$), and complex dielectric constants ${\varepsilon}({\nu})$ were measured in a frequency range from 0.3 THz to 1.5 THz. The measured real refractive indices were fitted using a Sellmeier equation. The results show that the Sellmeier equation fits well with the data throughout the frequency range and imply that the phonon modes of glasses vary with the glass compositions. The theory of far-infrared absorption in amorphous materials is used to analyze the results and to understand the differences in THz absorption among the sample glasses.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.05a
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• pp.348-349
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• 2019

의료영상은 진단을 목적으로 환자의 질환 부위별로 정밀하게 촬영하여 수집된 영상이다. 수집된 의료영상을 판독하여 진단하기 어려운 경우에는 조직검사를 통해 확진검사를 실시한다. 하지만 조직검사의 경우 환자에게 신체적, 경제적 부담을 줄 수 있다. 따라서 의료영상을 기반으로 정밀 진단하는데 도움을 줄 수 있는 정량분석 소프트웨어 개발이 중요하다. 현재 복부 간 질환의 경우 MELD(Model For End-Stage Liver Disease) 점수를 이용하여 간 질환의 중증도나 예후를 예측하는데 이용되고 있다. 하지만 MELD점수 산출에 있어서 의료영상 정보를 사용하지 않았기 때문에 질환 여부를 가늠하는데 에만 이용될 뿐 병변부위의 위치를 확인하는데 에는 어려움이 있다. 그러므로 본 논문은 다양한 의료영상장비에서 획득한 복부영상을 이용하여 복부질환의 중증도를 예측 및 분석함으로서 실제 임상진단에 도움을 줄 수 있는 시스템을 제안하고자 한다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.18 no.8
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• pp.98-103
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• 2019

A more accurate method of feature point extraction and matching for three-dimensional reconstruction using low-resolution images of crops is proposed herein. This method is important in basic computer vision. In addition to three-dimensional reconstruction from exact matching, map-making and camera location information such as simultaneous localization and mapping can be calculated. The results of this study suggest applicable methods for low-resolution images that produce accurate results. This is expected to contribute to a system that measures crop growth condition.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.05a
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• pp.454-456
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• 2021

본 논문은 웹의 발달로 인하여 의료 서비스들이 기존의 Client-Server 방식의 제품에서 Web 방식의 제품으로 변경되고 있는 현대 흐름에서 인공지능 어플리케이션 또한 Web 으로 서비스 하기 위한 방법과 구현된 요로결석 AI 어플리케이션에 대해 기술한다. 이를 구현하기 위해 Python 기반의 Flask 라는 마이크로 웹 프레임워크를 사용하여 DICOM 핸들링, Pre-Processing, Mask 를 생성하고 Predict 결과를 Model Serving 을 통하여 Urinary Stone Segmentation Model 이 서비스되는 인공지능 웹 어플리케이션 동작 방식과 수행 결과를 보인다.

• Journal of Broadcast Engineering
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• v.14 no.3
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• pp.332-341
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• 2009

Terrestrial digital multimedia broadcasting(T-DMB) is one of mobile broadcasting services, and the commercial service was started in December 2005 in Korea. The performance targets of T-DMB are providing VCD(video CD) quality video and FM radio quality audio. In recent years, the researches for providing high quality video or audio service on T-DMB environments have been being carried out. To provide high-quality video or audio service, some additional data should be transmitted to the receiver as well as T-DMB video and audio data. Since the data rate for one T-DMB program is low, it is important to transmit the additional data at a low bit rate. In this paper, we propose a packetizing method for efficient transmission of the additional data to provide multichannel audio service on T-DMB environment.