• Journal of Astronomy and Space Sciences
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• 제25권1호
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• pp.43-52
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• 2008

2007년에 Giove-A 실험위성의 항법메시지 송신 시험이 성공적으로 끝마침으로써, 차세대 위성 항법시스템인 갈릴레오 계획이 초기궤도 검증단계를 앞두고 있다. 한국천문연구원의 우주측지연구부와 전파천문연구부는 제주 탐라대학교 내 유치 후보지에 대한 갈릴레오 센서 스테이션 전파 수신환경 공동조사를 2006년 8월 3일부터 5일까지 실시했다. 전계강도 스펙트럼은 전 대역$(800{\sim}2000MHz)$과 내 대역(E5, E6, L1 밴드)에 대해서 24시간 주파수 영역 관측을 했다. 이 단계에서 관측된 강한 내 대역 간섭 신호에 대해서 시간영역 분석을 했다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 심포지엄 논문집 정보 및 제어부문
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• pp.278-280
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• 2007

In this paper, wd design the Program Specific Information (PSI) parser and its On-Screen Display (OSD) on the middleware of ALi M3330 MPEG-2 decoder processor to analyze DVB-T Transport Stream(TS) information. To test the functional operation of the designed parser, we implement the DVB-T test board including the RF-tuner using ALi M3330 MPEP-2 decoder processor and confirm the correct operation using the input TS stream generated by DVB-T stream generator. The developed PSI parser could be used for the test environment, various channel extension, and the development of DVB-T reception module.

• Corrosion Science and Technology
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• 제3권5호
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• pp.222-225
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• 2004

A portable RF HTS SQUID-based susceptometer was applied to the measurement of fatigue behavior for type 316L(N) stainless steel containing 0.04% to 0.15% nitrogen content. Strain-controlled low cycle fatigue (LCF) tests were conducted at RT and $600^{\circ}C$ in air an atmosphere, and the magnetic moments were measured after the fatigue test using HTS SQUID. The magnetic moment of an as-received sample is higher than that of a fatigued sample in all the temperature ranges irrespective of the nitrogen content. The fatigue life decreased with an increasing test temperature up to $500^{\circ}C$, but increased at $600^{\circ}C$. The change of the magnetic moments by LCF test is attributed to the stress induced micro defects.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권2호
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• pp.202-211
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• 2014

The bulk current injection (BCI) and direct power injection (DPI) method have been established as the standards for the electromagnetic susceptibility (EMS) test. Because the BCI test uses a probe to inject magnetically coupled electromagnetic (EM) noise, there is a significant difference between the power supplied by the radio frequency (RF) generator and that transferred to the integrated circuit (IC). Thus, the immunity estimated by the forward power cannot show the susceptibility of the IC itself. This paper derives the real injected power at the failure point of the IC using the power transfer efficiency of the BCI method. We propose and mathematically derive the power transfer efficiency based on equivalent circuit models representing the BCI test setup. The BCI test is performed on I/O buffers with and without decoupling capacitors, and their immunities are evaluated based on the traditional forward power and the real injected power proposed in this work. The real injected power shows the actual noise power level that the IC can tolerate. Using the real injected power as an indicator for the EMS test, we show that the on-chip decoupling capacitor enhances the EM noise immunity.

• 대한전자공학회논문지SD
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• 제39권3호
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• pp.98-109
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• 2002

블루투스 무선 기술은 음성 및 데이터 전송을 위한 단거리 일대다중 무선 주파수 통신을 위해 제안된 범용적으로 사용 가능한 무선통신 기술이다. 블루투스는 2.4㎓ ISM 밴드에서 동작하며 약 l0m 범위의 다양한 이동 장치와 휴대용 장치를 위한 저가격의 기저대역 무선 접속을 제공한다 본 논문은 DMA 방식의 블루투스 기저대역 모듈을 개발하고 그 구조와 테스트 결과를 보인다. 개발된 모듈은 링크 컨트롤러, UART 그리고 오디오 코덱의 세가지 블록으로 구성되며 메인 프로세서 사이의 정보 전달 및 DMA지원을 위한 버스 인터페이스와 RF모듈과의 데이터 송수신을 위한 RF 인터페이스를 지원한다. DMA의 사용은 FIFO를 이용한 데이터의 송수신 방법을 사용하는 기저대역 모듈에 비하여 모듈의 구현 크기 및 데이터의 처리 속도에 있어서도 많은 차이점을 갖는다. 각 블록을 DMA를 지원하도록 설계함으로써 작은 크기의 모듈을 설계할 수 있다. 이러한 작은 크기의 모듈은 생산비용의 절감과 함께 다양한 응용분야에 사용될 수 있는 범용성을 제공한다. 또한 본 모듈은 UART를 이용한 펌웨어 업그레이드 방식을 지원하고 소프트 IP로 설계되었으며 FPGA와 ASIC으로 구현하여 개인용 컴퓨터 사이의 파일 전송과 비트-스트림 전송을 통해 테스트 되었다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1994년도 가을 학술발표회 논문집
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• pp.152-159
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• 1994

One of the main objectives of the study is to propose a pratical and realistic reliability analysis by ETCM(Expected Total Cost Minimization). This study is intended to propose the safety assesment and capacity rating of existing reinforced concrete members by evaluating the safety evaluation index, that is RF(Rating Factor) from the results of the field test and inspection for 5 reinforced concrete bridges. ETCM method is used for the reliability analysis of the proposed models. The proposed reliability model and method are applied the safety assesment and system factors of reinforced concrete members.

• 생약학회지
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• 제3권1호
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• pp.23-25
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• 1972

Preliminary investigations were carried out to isolate the constituents from the stems of genus Thalictrum. Methanol extracts of eight species from the genus were examined by thin layer chromatography. The author observed three different spots with Dragendorff's reagent in Thalictrum actaefolium, whereas none was detected in Thalictrum tuberiferum and Thalictrum simplex. Various fluorescent colors with different Rf values were detected in all species by UV ray, suggesting that each species may have different components.

• 한국윤활학회:학술대회논문집
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• 한국윤활학회 1997년도 제25회 춘계학술대회
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• pp.242-246
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• 1997

Diamond grit was coated with Ti by RF Sputtering to investigate the effect of coated diamond particles on performance of diamond impregnated saw. Coated and uncoated powders were separately mixed with 70Co-30W(wt %) powders by conventional milling technique. Hot pressing was carried out to make specimens. The wear test were carried out with these two types of diamond impregnated specimens. It was demonstrated that Ti coating was effective in improving the ability of grit retention and thus enhanced the tribological performance of diamond tool.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1376-1379
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• 1996

In this paper a GPS receiver is developed using commercial chipsets. GP2010 RF front end and GP2021 Multi-channel correlator of GEC PLESSY are adapted in designing the receiver hardware. MC 68340 is used for controlling the correlator GP2021 and implementing the navigation processing. Also presented are some test results of the developed receiver whose software has an interrupt driven structure rather than common real-time kernel based structure.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 춘계학술발표회
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• pp.1078-1079
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• 2005