• KASI NEWSLETTER
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• s.22
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• pp.1-4
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• 2000

광학천문학 워크샵 2000 성황리에 마쳐/소형망원경을 이용한 천체관측 연구 워크샵 개최/지역천문대 하반기 관측일정 확정000년 하계 교원연수/2000년 하계 교원연수 실시/새로운 홈페이지로 교체/연구원 방문의 날 행사 실시/CFH와의 국제공동 운영에 관한 MOU 체결 의의/IAU 24차 정기 총회 소식/외국의 천문대 현황-BBSO 태양관측소/CAPP 2000 conference를 다녀와서/콜로키움/소백산 천문대의 어제와 오늘

• Defense and Technology
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• no.10 s.164
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• pp.28-29
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• 1992

산.학.연의 기술협력 활성화와 연구기반 확대를 모색하기 위한 제2차 유도무기 학술대회(추진기관분야)가 8월 20일과 21일에 국과연 국제회의실에서 열렸습니다. 여러 사정상 내용을 접할수 없었던 분들을 위해 본 지에서는 지난호(92/9월호)에 일부(5편)를 수정 (요약) 게재한데이어, 이번호에도 5편을 발췌.개작하여 소개합니다

• Broadcasting and Media Magazine
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• v.20 no.2
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• pp.27-32
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• 2015

플랙서블 디스플레이는 차세대 정보표시 소자의 가장 핵심적인 산업분야로 많은 연구와 기술개발결과들을 바탕으로 현재 핸드폰 등의 소형 디스플레이에 적용되고 있다. 이러한 성공적인 시장 진입은 새로운 디스플레이 제조 공정과 신개발 재료들을 기반으로 달성할 수 있었다. 저자는 이러한 플렉서블 디스플레이의 원리 및 개발 역사 그리고 플렉서블 디스플레이의 핵심 기술인 플렉서블 투명전극 형성 기술에 대하여 설명하고자 한다.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.38 no.3
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• pp.24-27
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• 2009

열교환 효율이 높고 소형화에 유리하여 차세대 열교환기 기술로 떠오르고 있는 마이크로 채널기반의 열교환기를 극저온 LNG 플랜트에 적용하기 위한 연구에 대하여 소개하고자 한다.

• Journal of the Microelectronics and Packaging Society
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• v.4 no.2
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• pp.63-70
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• 1997

본 연구에는 휴대용 전화기의 핵심부품인 PLl Module의 초소형화 설계기술 표면실 장기술, 고주파 설계기술, 소형화 SMD 기술, Test 기술 및 PLL Module 활용기술 등을 개 발하였으며 차세대 Digital PLL Module의 설계기반 마련 및 대외 경쟁력 있는 PLl Module 의 초소형화 기술을 확보하였다.

• Proceedings of the KSR Conference
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• 2002.05a
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• pp.47.2-60
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• 2002

전기철도(Electric Railway) 실용화 - 1879년 베를린(Berlin) 산업박람회에서 시멘스 할스케 (Siemens Halske) 회사가 소형 전기기관차로 객차 3량을 속도 12[Km/h]로 견인 운전 전기철도(Electric Railway) 상업운전 - 시멘스 할스케 회사가 1881년에 베를린시 부근의 리히테르펠데(Lichterfelde)에 전기철도를 건설하여 전기차에 의한 일반여객 수송(중략)

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.96-97
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• 2002

• The Journal of the Acoustical Society of Korea
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• v.39 no.1
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• pp.47-56
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• 2020

The sound source localization technique has various application fields in the era of internet-of-things, for which the probe size becomes critical. The localization methods using the acoustic intensity vector has an advantage of downsizing the layout of the array owing to a small finite-difference error for the short distance between adjacent microphones. In this paper, the acoustic intensity vector and the Time Difference of Arrival (TDoA) method are compared in the viewpoint of the localization error in the far-field. The comparison is made according to the change of spacing between adjacent microphones of the three-dimensional microphone array arranged in a tetrahedral shape. An additional test is conducted in the reverberant field by varying the reverberation time to verify the effectiveness of the methods applied to the actual environments. For estimating the TDoA, the Generalized Cross Correlation-Phase transform (GCC-PHAT) algorithm is adopted in the computation. It is found that the mean localization error of the acoustic intensimetry is 2.9° and that of the GCC-PHAT is 7.3° for T₆₀ = 0.4 s, while the error increases as 9.9°, 13.0° for T₆₀ = 1.0 s, respectively. The data supports that a compact array employing the acoustic intensimetry can localize of the sound source in the actual environment with the moderate reflection conditions.

• Journal of Korean Society of Steel Construction
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• v.13 no.4
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• pp.381-393
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• 2001

The current traffic situation in Korea can be described as rapid change in traffic volume and diversity in vehicle size from compact cars to large trucks. W-beam barrier most widely used in Korea was found not to satisfy the stiffness requirement for the Koran impact condition of 14 ton-60Km/h-15deg. and it was too stiff for small vehicles impacting with more realistic speed to satisfy the safety of vehicle occupants. To develop a guardrail system satisfying the two contradicting goals, a thrie-beam guardrail system, which had the beam thickness of 3.2mm and rubber cushions, was conceived. Even though the height of the thrie-beam(450mm) is increased by 100mm as compared to that of W-beam (350mm), there was only 2% increase in the weight of the thrie-beam. The new thrie-beam barrier system could contain more wide range of vehicle bumper heights, and showed better performance in the viewpoint of stiffness and energy absorbing capability than the W-beam system. The impact performance was evaluated from a crash test. The developed thrie-beam guardrail system satisfied all applicable criteria for NCHRP 350 test designation 3-10.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.14 no.9
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• pp.904-911
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• 2003

A new method to reduce the size of microwave amplifiers spiral-shaped defected ground structure(Spiral-DGS) is proposed. A microstrip line having Spiral-DGS on the ground plane produces increased slow-wave factor and electrical length for the fixed physical length. In addition, it provides an excellent rejection characteristic for a finite frequency band like band rejection filters. The rejection band is used for rejecting harmonic components of amplifiers. The reduced microstrip line lengths in matching networks by Spiral-DGS are 39 % and 44 % of the original ones in input and output matching networks, respectively. It is shown that the measured S-parameters of the reduced amplifier agree well with those of the original amplifier. The measured second harmonic of the reduced amplifier is much less than that of the original amplifier by at least 10 dB. The same technique is applied to reject the third harmonic using the proper Spiral-DGS for the third harmonic frequency. The measured third harmonic is smaller than that of the original amplifier by 25 dB.