연구논문 Korean Journal of Optics and Photonics, Volume 25, Number 2, April 2014 DOI: ISSN : (Print)

Size: px
Start display at page:

Download "연구논문 Korean Journal of Optics and Photonics, Volume 25, Number 2, April 2014 DOI: ISSN : (Print)"

Transcription

1 연구논문 Korean Journal of Optics and Photonics, Volume 25, Number 2, April 2014 DOI: ISSN : (Print) ISSN : X(Online) Terahertz Time-Domain Spectroscopy and Imaging using Compact Fiber-coupled Terahertz Modules Young-Jong Yoon 1,2, Namje Kim 1, Han-Cheol Ryu 3, Kiwon Moon 1, Jun-Hwan Shin 1,2, Sang-Pil Han 1,2, and Kyung Hyun Park 1,2 1 THz Photonics Creative Research Center, ETRI, Daejeon , Korea 2 School of Advanced Device Technology, UST, Daejeon , Korea 3 Department of Car Mechatronics, Sahmyook University, Seoul , Korea (Received February 3, 2014; Revised manuscript February 24, 2014; Accepted February 24, 2014) We have demonstrated a terahertz (THz) time-domain spectroscopy and imaging system using compact fiber-coupled THz modules. Using this THz spectroscopy system we have measured the absorption spectrum of water vapor in free space over 3 THz, as well as the refractive indices of various substrates such as Si, Al 2 O 3, and GaAs using the transfer-function method. Through the THz imaging system we have observed a high-quality THz image of a medical knife and metal clip sample, with a resolution of pixels using a step size of 250 μm. Keywords: THz time domain spectroscopy(thz-tds), Refractive index, THz image detection OCIS codes : ( ) Spectroscopy, terahertz; ( ) Photoconductivity; ( ) Nondestructive testing; ( ) Image detection systems 초소형의광섬유결합형테라헤르츠모듈을이용한시간영역에서의분광및이미징 윤영종 1,2 ㆍ김남제 1 ㆍ류한철 3 ㆍ문기원 1 ㆍ신준환 1,2 ㆍ한상필 1,2 ㆍ박경현 1,2 1 한국전자통신연구원 THz 포토닉스창의연구센터우 대전시유성구가정로 218 번지 2 과학기술연합대학원대학교차세대소자공학과우 대전시유성구가정로 217 번지 3 삼육대학교메카트로닉스학과우 서울시노원구화랑로 815 번지 (2014 년 2 월 3 일받음, 2014 년 2 월 24 일수정본받음, 2014 년 2 월 24 일게재확정 ) 본논문에서는초소형의광섬유결합형테라헤르츠모듈을이용하여테라헤르츠시간영역분광및영상시스템을구성하였다. 구성된 THz 분광시스템을이용하여 3 THz 이상의자유공간에분포되어있는수분의고유흡수스펙트럼을관측하였고테라헤르츠대역에서의 Si, Al2O3, GaAs 기판에대한굴절률을측정하였으며측정을위해다중반사를고려한전달함수를이용한굴절률측정방법을이용하였다. 또한, 테라헤르츠영상시스템을이용하여의료용칼과클립을측정하여 250 μm 간격으로 픽셀의영상을얻었다. Keywords: 테라헤르츠시간영역분광시스템 (THz-TDS), 굴절률, THz 영상측정 OCIS codes : ( ) Spectroscopy, terahertz; ( ) Photoconductivity; ( ) Nondestructive testing; ( ) Image detection systems Color versions of one or more of the figures in this paper are available online. 72

2 연구논문 초소형의광섬유결합형테라헤르츠모듈을이용한시간영역에서의분광및이미징 윤영종ㆍ김남제외 73 I. 서론 테라헤르츠 (THz) 파는전자기파스펙트럼영역에서마이크로웨이브와적외선영역사이의일반적으로 0.1~10 THz에해당하는파를말하며, 적외선이가지는직진성과마이크로웨이브가가지는다양한비전도성물질 ( 옷, 종이, 나무, 플라스틱, 벽돌 ) 등을투과하는독특한특성을가진다. 이영역은기술적한계에의해전자기파스펙트럼중가장접근하기어려운영역으로알려져왔다. 하지만펨토초레이저와재료기술, 공정기술등의발전으로다양한 THz 파원들이등장하였고이분야는지속적으로발전해왔다. 물질의원자나분자를이온화시키는 X선과는달리그에너지가 mev 정도로낮아서투과하는물질을파괴시키지않는비이온화 (non-ionizing), 비파괴특성을가지며기존의분광기법으로탐지할수없는주파수대역에서물질고유의흡수스펙트럼, 물리적특성을확인할수있다. 이러한특성은 THz 파를이용한분광및영상기술로발전시켰고기판검사, 금지약물이나위험물에대한모니터링, 암세포분별등의보안, 의료, 환경, 비파괴검사분야에활용될수있는가능성을보여주었다 [1]. 대부분의경우 THz 시스템은광학계를이용하여구성되며시스템의크기가비교적커서이동성이좋지않다. 하지만 THz 시스템의활용도가높아질수록동적환경에서이용가능한 THz 시스템이필요하며이를위해이동성이좋은소형의 THz 시스템에대한지속적인연구가진행중이다 [2-4]. 현재연구되는소형의 THz 발생및검출시스템들은광섬유와광전도안테나가하나의모듈로구성되어있는형태로이동성이좋고, 광통신용레이저를이용하므로저렴하게구성할수있으며안정적으로 THz 펄스파및연속파발생및검출이가능하다 [3-8]. 본연구에서는먼저, 초소형크기의광섬유결합형 THz 발생및검출모듈을자체제작한후, 이를이용하여 THz 분광및영상시스템을구축하였다. 그리고이를이용하여시료 Al 2 O 3 기판의굴절률및흡수율을 Newton-Raphson 방법을이용하여측정하였고또한의료용칼과클립의 2차원스캔을통한 THz 이미지를측정하였다. II. 광섬유결합형 THz 모듈및분광시스템 에도달할수있도록설계하였다. 모듈에서는광전류의증가로인한열을효과적으로방출하기위해방열효율이우수한 Aluminium nitride(aln) 서브마운트를이용하였고 [3], 고저항실리콘렌즈를이용하여자유공간으로방사되는 THz파의손실을줄이고원하는방향으로 THz 파가진행되도록하였다. 모듈하우징을이용하여구성요소들을고정시켰으며, 완성된모듈의부피는 0.7 cc 이다. 위와같은초소형의광섬유결합형 THz 모듈을이용한 THz-TDS 시스템은그림 2와같다. 본시스템은중심파장이 1.55 μm이며펄스폭이 70 fs, 반복율이 100 MHz 인펨토초레이저와, 단일모드광섬유 (SMF; single-mode fiber), 분산보상광섬유 (DCF; dispersion compensated fiber), 1 2 광분배기 (1 2 splitter), THz 모듈, 시간지연기 (delay line), 함수발생기 (function generator), Lock-in 증폭기 (lock-in amplifier) 로구성되어있으며, 두개의 THz 모듈을각각 THz 발생기와검출기로이용하였다. 펨토초레이저에서발생된펄스를광섬유에입사한다. 입사된 1.55 μm 파장의광은광섬유를진행 FIG. 1. Photograph of a compact fiber-coupled THz module. 그림 1은자체개발된 THz파발생및검출기모듈이다. 모은 THz 발생및검출에필요한광전도안테나와서브마운트, 모듈하우징, 고저항실리콘렌즈, 단일모드광섬유, 동축케이블이하나의모듈로구성되어있다. 모듈에이용한광전도안테나는 InP 기판위에 Be가도핑된 InGaAs층을 1.2 μm 두께로성장시켜활성층으로이용하였고광전도층의운반자수명시간은대략 1.7 ps 이다. 안테나는 log-spiral 형태이며안테나중앙에 µm 2 크기의활성층이있다. 서브마운트는광전도안테나를지지하는역할로광전도안테나에외부바이어스를인가하고레이저펄스가안테나의활성영역 FIG. 2. Photograph of THz emitter and detector modules and THz time-domain spectroscopy setup using the THz modules (DCF: dispersion compensated fiber, SMF: single-mode fiber, GPIB: general-purpose interface bus).

3 74 한국광학회지제 25 권제 2 호, 2014 년 4 월 할때분산이발생하므로분산보상광섬유를이용하여레이저펄스의분산을최소화하였다. 실제시스템에서는 6 m 길이의광섬유와광학계등에서발생되는분산을보상하기위하여 1.3 m 길이의분산보상광섬유를장착하였다. 입사된펨토초펄스가 1 2 광분배기를지나면두개의광으로나누고각각 THz 발생기와검출기에전달시켜내부에있는광전도안테나의활성층을여기시킨다. THz 발생기에서는여기된광전도안테나에외부바이어스를인가하여 THz 펄스를생성시키고 THz 검출기에서는 Lock-in 증폭기를이용하여자유공간을통해전달된 THz 펄스를호모다인검파방법으로측정하였다. 또한계측장비의작동및데이터수집은상용소프트웨어인 Labview(National Instruments Co.) 를이용하였다. THz-TDS 시스템으로자유공간에서측정한 THz 펄스파의실험결과를그림 3에나타내었다. 발생기와검출기사이의자유공간의거리는 70 mm 이며, 발생기와검출기에도달한펄스광의세기는각각평균 11 dbm, 8 dbm이다. THz 발생기에진폭 6.5V의사인파를바이어스로인가했으며이때발생한광전류는약 0.5 ma 이다. 그림 3 는광섬유결합형 THz-TDS 시스템을이용하여자유공간에서측정한시간영역에서의 THz 의신호이다. 측정신호에서나타나는다중 피크는 log-spiral 안테나에서나타나는특징이며, 신호지속시간은약 40 ps이다. 그림 3 는측정된시간영역에서의결과를 Fast Fourier Transform(FFT) 한자유공간에서의 THz 주파수스펙트럼이다. 이결과에서보면수증기분자에포함되어있는하이드록시기 (-OH) 에기인된특정주파수에서흡수피크들을발견할수있다. 이흡수피크들이발견된주파수는 0.56, 0.75, 0.98, 1.11, 1.16, 1.20, 1.23, 1.41, 1.60, 1.67, 1.71, 1.80, 1.87, 1.92, 2.04, 2.12, 2.16, 2.20, 2.22, 2.26, 2.39, 2.46, 2.64, 2.77, 2.89, 2.97, 3.01, 3.05 THz로상온의자유공간에존재하는수분의흡수주파수와일치하였다 [9, 10]. III. THz 분광및이미징실험결과 3.1. Al 2 O 3 의굴절률측정 그림 4는 THz 발생기와검출기사이에시료를두었을때나타나는 THz 파의경로이다. 매질1 과매질3 은자유공간이며매질2 는시료이다. 발생기에서발생된 THz 펄스를시료에입사시키면자유공간에서시료를통과하여검출기에도달한다. THz 펄스가각매질을지날때마다펄스의일부는반사하는특성으로인해시료내부에서다중반사가일어난다. 광섬유결합형 THz 모듈에서발생된 THz 펄스의신호지속시간은약 40 ps이며이는반도체기판과같은얇은두께의시료를측정할경우시료에서반사되는시간이짧아신호지속기간동안본신호와반사된신호가함께측정된다. 그러므로얇은두께의시료의굴절률측정시반드시다중반사가고려되어야한다. 는시료에입사되기전발생기에서발생된 THz 펄스신호의진폭이며는시료를통과하여검출기에서측정된 THz 신호의진폭으로시료에서발생된다중반사가포함된결과로측정된다. 측정된와를통해시료의투과계수를구할수있으며, 투과계수에대한 FIG. 3. Time domain trace of a THz electric field and its FFT amplitude spectrum in free space. FIG. 4. Schematic diagram of the propagation of a THz pulse.

4 연구논문 초소형의광섬유결합형테라헤르츠모듈을이용한시간영역에서의분광및이미징 윤영종ㆍ김남제외 75 전달함수는다중반사에의한 Fabry-Perot 효과를고려하여식 (1) 와같이정의된다. (1) 여기서 는매질 1과 2사이의반사진폭계수, 는매질 1과 2사이의투과진폭계수이며, c는광속이다. 반사진폭 계수와투과진폭계수는각각식 (2) 과 (3) 로정의한다. (2) (3) 은주파수에따른시료의복소굴절률이며, ω는각주파수 [rad/s], d는시료의두께다. 실험에사용한시료는 Si(100), Al 2 O 3 (0001), GaAs(100) 기판이며, 시료의두께는각각 300 μm, 480 μm, 350 μm이다. 굴절률의계산은 Newton-Raphson 법을이용하였다 [11, 12]. 와의차를라정의하고다음식과같이정의된다. (4) 그림 5 는자유공간과시료를지나는 THz 펄스의시간영역에서의신호를나타낸다. 측정된 THz 신호의길이는약 40 ps로신호에서발생되는다중반사가본신호에묻히기에충분히긴길이이고, 펄스가시료를통과할때자유공간에서의속도보다줄어들어시간지연이발생하였다. 이렇게발생된시간지연을통해얻어진시간영역에서의굴절률을 Newton-Raphson법의초기값으로설정하였고, 시간영역신호를각각 FFT하여와를구하였다. 또한, 의허용오차는 10-7 이며의결과가허용오차보다클경우식 (5) 과같이초기값에서본함수 (5) 와접선의기울기를나눈값의차를이용하여굴절률을계산하였다. 위와같은방법으로구한굴절률은그림 5 에나타내었다. Si 기판의경우약 범위의굴절률로측정되었고 Al 2 O 3 기판의경우 로측정되었으며 GaAs 기판의경우 범위의굴절률이측정되었다. 높은주파수영역에비하여낮은주파수영역에서측정된굴절률이상대적으로일정하지않은것으로측정되었다. 낮은주파수대역인, 파장보다얇은두께의시료에서는 THz 파가투과된양이적어측정된결과가일정하지않는것으로나타났으며, (5) FIG. 5. Scanned time domain THz signal of free space (black), 300 μm thick Si (red), 480 µm thick Al 2 O 3 (green) and 350 μm thick GaAs (blue) Measured reflective index of the Si, Al 2 O 3 and GaAs. 이렇게변하는현상은 THz 파의파장보다두꺼운시료를이용하거나시료에서반사된신호를추가적으로측정하여보정을해주면억제시킬수있다 [13]. 이결과는기존의알려진바와비슷한결과를가지며 [14, 15], 이결과는 THz 모듈을이용한분광연구의응용가능성을보여준다 테라헤르츠영상 THz 파의투과특성을이용한영상을얻기위해그림 6 와같이초소형 THz 모듈을이용한영상시스템을구성하였다. 이는앞서분광시스템과비교하여 THz 파의발생기와측정기는동일하나시료의 2차원이미지를얻기위하여시료를 2차원으로움직일수있는 x-y축스테이지에위치시켜실험을실시하였다. THz 파가금속을투과하지못하므로 THz 시간영역신호의피크에서의샘플이있는곳과없는곳의진폭변화로샘플의영상을측정하였다 [17]. 측정에사용된 log-spiral 안테나는다중피크특성이나타나며앞쪽피크

5 76 한국광학회지제 25 권제 2 호, 2014 년 4 월 FIG. 7. Raw THz images of a medical knife and a clip, image profile of a line segment (A-B), and (c) image profile of a line segment (C-D). 얇을수록투과량이높아짐을볼수있다. 이는 THz 파의크기가측정된금속의두께보다커금속의두께에따라 THz 파투과량이다르게나타나는것을확인하였다. 그림 7(c) 는구간 C-D의프로파일이다. 칼의금속면부분이 THz 파의크기보다넓어 THz 파가투과되지않았으며, 칼의구멍부분에서는 THz 파가일부투과됨을볼수있다. 금속면의넓이와두께에따라 THz 파의투과량이다르게나타났지만샘플의유무를충분히구별할수있었다. 이러한결과를통해 THz 파를이용하여숨어있는물체의탐지가가능하며, 선명하게영상물을측정할수있음을보여준다. 그리고 THz 파를이용한영상연구에초소형의 THz 모듈의응용가능성을보여준다. FIG. 6. Photograph of THz imaging system and a medical knife and a clip with the inset showing the time delay position used to measure THz imaging. IV. 결 론 에고주파수성분이모여있는특성이있다. 그러므로영상의해상도를높이고 SNR(Signal-to-Noise Ratio) 을확보하기위해그림 6 와같이두번째피크지점에서영상을측정하였다. 측정에사용된샘플은그림 6 와같이의료용칼과클립이며테플론지지대에시료를두고그위에종이로덮어시료가보이지않도록하였다. 의료용칼은가로, 세로각각 45 mm, 10 mm 이고칼은중간부분에세로로 2-3 mm의구멍을가지고있으며클립은가로, 세로, 두께각각 33 mm, 8mm, 1 mm 이다. THz 펄스의발생기와검출기는 70 mm이며발생기에서부터시료까지 THz 발생기에사용한실리콘렌즈의초점거리를고려하여 15 mm 의거리를유지하였다. 시료를 x-y 축스테이지에고정시켜 250 μm 간격으로 픽셀을스캔하였다. 그림 7 는샘플의영상결과이다. 결과이미지의 SNR은약 130(21.1dB) 이며, 샘플의사이즈가동일하게측정되었으며, 측정된이미지에서의료용칼의구멍과클립의형태가정확히드러나실제와유사한영상결과를얻을수있었다. 그림 7 는구간 A-B의프로파일이다. THz 파가투과될때금속면의두께가두꺼울수록 THz 파의투과량은줄어들고 본논문에서는초소형크기의광섬유결합형 THz 모듈을이용하여 THz-TDS 및영상실험을수행하였으며 3 THz이상의수분에기안한 THz 흡수피크를구별하였다. 이 THz-TDS 시스템을이용하여 THz 대역에서의 Al 2 O 3 의굴절률과칼과클립의영상을측정하였다. 굴절률측정시신호지속시간동안반사신호가함께측정되는현상으로인해다중반사를고려하였으며, Newton-Raphson 법을이용하여굴절률을구하였다. 각각측정된굴절률은 Si 기판의경우약 , Al 2 O 3 기판의경우 , GaAs 기판의경우 범위로측정되어기존의알려진바와비슷한결과로나타남을확인할수있었다. 영상실험을통해의료용칼과클립이실제와비슷하게측정되었다. 이러한결과는초소형의 THz 모듈의분광및영상측정에대한가능성을보여주고있다. 앞으로 THz 분야의응용은더욱커질것이라예상되며그와더불어소형의 THz 발생시스템이요구될것이다. 본논문은초소형의광섬유결합형 THz 모듈을이용한결과라는데에의미가있으며다양한연구분야에서의초소형모듈을이용한 THz 파의응용가능성을보였다. 그리고계속적으로발전할소형의 THz 발생및검출분야에참고자료가될것으로기대된다.

6 연구논문 초소형의광섬유결합형테라헤르츠모듈을이용한시간영역에서의분광및이미징 윤영종ㆍ김남제외 77 References 1. M. Tonouchi, Cutting-edge terahertz technology, Nat. Photon. 1, (2007). 2. B. Sartorius, H. Roehle, H. Künzel, J. Böttcher, M. Schlak, D. Stanze, H. Venghaus, and M. Schell, All-fiber terahertz time-domain spectrometer operating at 1.5 µm telecom wavelengths, Opt. Express 16, (2008). 3. S.-P. Han, N. Kim, H. Ko, H.-C. Ryu, J.-W. Park, Y.-J. Yoon, J.-H. Shin, D. H. Lee, S.-H. Park, S.-H. Moon, S.-W. Choi, H. S. Chun, and K. H. Park, Compact fiber-pigtailed InGaAs photoconductive antenna module for terahertz-wave generation and detection, Opt. Express 20, (2012). 4. S.-P. Han, H. Ko, N. Kim, H.-C. Ryu, C. W. Lee, Y. A. Leem, D. Lee, M. Y. Jeon, S. K. Noh, H. S. Chun, and K. H. Park, Optical fiber-coupled InGaAs-based terahertz time-domain spectroscopy system, Opt. Lett. 36, (2011). 5. N. Kim, Y. A. Leem, H. Ko, M. Y. Jeon, C. W. Lee, S. P. Han, D. Lee, and K. H. Park, Widely tunable 1.55 μm detuned dual mode laser diode for compact continuous-wave THz emitter, ETRI J. 33, (2011). 6. N. Kim, S.-P. Han, H. Ko, Y. A. Leem, H.-C. Ryu, C. W. Lee, D. Lee, M. Y. Jeon, S. K. Noh, and K. H. Park, Tunable continuous-wave terahertz generation/detection with compact 1.55 µm detuned dual-mode laser diode and InGaAs based photomixer, Opt. Express 19, (2011). 7. N. Kim, H.-C. Ryu, D. Lee, S.-P. Han, H. Ko, K. Moon, J.-W. Park, M. Y. Jeon, and K. H. Park, Monolithically integrated optical beat sources toward a single-chip broadband terahertz emitter, Laser Physics Letters 10, (2013). 8. K. H. Park, N. Kim, H. Ko, H.-C. Ryu, J.-W. Park, S.-P. Han, and M. Y. Jeon, Portable terahertz spectrometer with InP related semiconductor photonic devices, Proc. SPIE 8261, (2012). 9. A. Danylov, THz laboratory measurements of atmospheric absorption between 6% and 52% relative humidity, Submillimeter-Wave Technology Laboratory University of Massachusetts Lowell, (2006). 10. X. Xin, H. Altan, A. Saint, D. Matten, and R. R. Alfano, Terahertz absorption spectrum of para and ortho water vapors at different humidities at room temperature, J. Appl. Phys. 100, (2006). 11. L. Duvillaret, F. Garet, and J.-L. Coutaz, A reliable method for extraction of material parameters in terahertz time-domain spectroscopy, IEEE J. Select. Topics Quantum Electron. 2, (1996). 12. D.-x. Zhou, E. P. J. Parrott, D. J. Paul, and J. A. Zeitler Determination of complex refractive index of thin metal films from terahertz time-domain spectroscopy, J. Appl. Phys. 104, (2008). 13. A. L. Chung, Ph. D. Thesis, University of Southampton (2012), p D. Grischkowsky, S. Keiding, M. v. Exter, and Ch. Fattinger, Far-infrared time-domain spectroscopy with terahertz beams of dielectrics and semiconductors, J. Opt. Soc. Am. B 7, (1990). 15. L. Duvillaret, F. Garet, and J.-L. Coutaz, A reliable method for extraction of material parameters in terahertz time-domain spectroscopy, IEEE J. Select. Topics Quantum Electron. 2, (1996). 16. M. Herrmann, M. Tani, and K. Sakai, Display modes in time-resolved terahertz imaging, Jpn. J. Appl. Phys. 39, 6254 (2000).

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct ,,. 0.5 %.., cm mm FR4 (ε r =4.4)

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct ,,. 0.5 %.., cm mm FR4 (ε r =4.4) THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Oct.; 29(10), 799 804. http://dx.doi.org/10.5515/kjkiees.2018.29.10.799 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Method

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 28(3),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 28(3), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2017 Mar.; 28(3), 163 169. http://dx.doi.org/10.5515/kjkiees.2017.28.3.163 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) PCB

More information

CD실행표지

CD실행표지 November 30 (Wed) ~December 2 (Fri), 2011 Hanwha Phoenix Park, PyeongChang Organized by OSK / Photonics Division KICS / Optical Communication Division IEEK / Optical Wave and Quantum Electronics Division

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Oct.; 27(10),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Oct.; 27(10), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Oct.; 27(10), 926 934. http://dx.doi.org/10.5515/kjkiees.2016.27.10.926 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Multi-Function

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 26(10),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 26(10), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Sep.; 26(10), 907 913. http://dx.doi.org/10.5515/kjkiees.2015.26.10.907 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Prediction

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 29(2), IS

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 29(2), IS THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Feb.; 29(2), 93 98. http://dx.doi.org/10.5515/kjkiees.2018.29.2.93 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) UHF-HF

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Jun.; 27(6), 495 503. http://dx.doi.org/10.5515/kjkiees.2016.27.6.495 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Design

More information

(JBE Vol. 21, No. 1, January 2016) (Regular Paper) 21 1, (JBE Vol. 21, No. 1, January 2016) ISSN 228

(JBE Vol. 21, No. 1, January 2016) (Regular Paper) 21 1, (JBE Vol. 21, No. 1, January 2016)   ISSN 228 (JBE Vol. 1, No. 1, January 016) (Regular Paper) 1 1, 016 1 (JBE Vol. 1, No. 1, January 016) http://dx.doi.org/10.5909/jbe.016.1.1.60 ISSN 87-9137 (Online) ISSN 16-7953 (Print) a), a) An Efficient Method

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 30(9),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Sep.; 30(9), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2019 Sep.; 30(9), 712 717. http://dx.doi.org/10.5515/kjkiees.2019.30.9.712 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) MOS

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jun.; 27(6), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Jun.; 276), 504511. http://dx.doi.org/10.5515/kjkiees.2016.27.6.504 ISSN 1226-3133 Print)ISSN 2288-226X Online) Near-Field

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jul.; 27(7),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jul.; 27(7), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Jul.; 27(7), 625634. http://dx.doi.org/10.5515/kjkiees.2016.27.7.625 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Near-Field

More information

Slide 1

Slide 1 Clock Jitter Effect for Testing Data Converters Jin-Soo Ko Teradyne 2007. 6. 29. 1 Contents Noise Sources of Testing Converter Calculation of SNR with Clock Jitter Minimum Clock Jitter for Testing N bit

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 30(3),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 30(3), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2019 Mar.; 30(3), 223 228. http://dx.doi.org/10.5515/kjkiees.2019.30.3.223 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Analysis

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Nov.; 26(11),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Nov.; 26(11), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Nov.; 26(11), 985991. http://dx.doi.org/10.5515/kjkiees.2015.26.11.985 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Analysis

More information

09권오설_ok.hwp

09권오설_ok.hwp (JBE Vol. 19, No. 5, September 2014) (Regular Paper) 19 5, 2014 9 (JBE Vol. 19, No. 5, September 2014) http://dx.doi.org/10.5909/jbe.2014.19.5.656 ISSN 2287-9137 (Online) ISSN 1226-7953 (Print) a) Reduction

More information

04 김영규.hwp

04 김영규.hwp THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 214 Nov.; 25(11), 1121 1127. http://dx.doi.org/1.5515/kjkiees.214.25.11.1121 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Planar

More information

. 서론,, [1]., PLL.,., SiGe, CMOS SiGe CMOS [2],[3].,,. CMOS,.. 동적주파수분할기동작조건분석 3, Miller injection-locked, static. injection-locked static [4]., 1/n 그림

. 서론,, [1]., PLL.,., SiGe, CMOS SiGe CMOS [2],[3].,,. CMOS,.. 동적주파수분할기동작조건분석 3, Miller injection-locked, static. injection-locked static [4]., 1/n 그림 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Feb.; 27(2), 170175. http://dx.doi.org/10.5515/kjkiees.2016.27.2.170 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Analysis

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Nov.; 26(11),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Nov.; 26(11), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Nov.; 26(11), 978 984. http://dx.doi.org/10.5515/kjkiees.2015.26.11.978 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Transceiver

More information

<35335FBCDBC7D1C1A42DB8E2B8AEBDBAC5CDC0C720C0FCB1E2C0FB20C6AFBCBA20BAD0BCAE2E687770>

<35335FBCDBC7D1C1A42DB8E2B8AEBDBAC5CDC0C720C0FCB1E2C0FB20C6AFBCBA20BAD0BCAE2E687770> Journal of the Korea Academia-Industrial cooperation Society Vol. 15, No. 2 pp. 1051-1058, 2014 http://dx.doi.org/10.5762/kais.2014.15.2.1051 멤리스터의 전기적 특성 분석을 위한 PSPICE 회로 해석 김부강 1, 박호종 2, 박용수 3, 송한정 1*

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 25(3),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 25(3), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2014 Mar.; 25(3), 304310. http://dx.doi.org/10.5515/kjkiees.2014.25.3.304 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Analysis

More information

KAERIAR hwp

KAERIAR hwp - i - - ii - - iii - - iv - - v - - vi - Photograph of miniature SiC p-n and Schottky diode detector Photograph SiC chip mounted on a standard electrical package Photograph of SiC neutron detector with

More information

08김현휘_ok.hwp

08김현휘_ok.hwp (Regular Paper) 21 3, 2016 5 (JBE Vol. 21, No. 3, May 2016) http://dx.doi.org/10.5909/jbe.2016.21.3.369 ISSN 2287-9137 (Online) ISSN 1226-7953 (Print) a), a) An Audio Coding Technique Employing the Inter-channel

More information

High Resolution Disparity Map Generation Using TOF Depth Camera In this paper, we propose a high-resolution disparity map generation method using a lo

High Resolution Disparity Map Generation Using TOF Depth Camera In this paper, we propose a high-resolution disparity map generation method using a lo High Resolution Disparity Map Generation Using TOF Depth Camera In this paper, we propose a high-resolution disparity map generation method using a low-resolution Time-Of- Flight (TOF) depth camera and

More information

. 0.. Planck : sec : sec : : m in radian m in ln sec 심장 발 기압

. 0.. Planck : sec : sec : : m in radian m in ln sec 심장 발 기압 . 0.. Planck : sec : sec : : sec sec A . 0.. Planck : sec : sec : : m in radian m in ln sec 심장 발 기압 . 0. sec π . 0.. Planck : sec : sec : : sec sec sec sec . 0.. Planck : sec : sec : : m p = 1u=931.5 MeV

More information

1. Features IR-Compact non-contact infrared thermometer measures the infrared wavelength emitted from the target spot and converts it to standard curr

1. Features IR-Compact non-contact infrared thermometer measures the infrared wavelength emitted from the target spot and converts it to standard curr Non-Contact Infrared Temperature I R - Compact Sensor / Transmitter GASDNA co.,ltd C-910C, Bupyeong Woolim Lion s Valley, #425, Cheongcheon-Dong, Bupyeong-Gu, Incheon, Korea TEL: +82-32-623-7507 FAX: +82-32-623-7510

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 6, Jun Rate). STAP(Space-Time Adaptive Processing)., -

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 6, Jun Rate). STAP(Space-Time Adaptive Processing)., - THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Jun.; 29(6), 457463. http://dx.doi.org/10.5515/kjkiees.2018.29.6.457 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Sigma-Delta

More information

09È«¼®¿µ 5~152s

09È«¼®¿µ5~152s Korean Journal of Remote Sensing, Vol.23, No.2, 2007, pp.45~52 Measurement of Backscattering Coefficients of Rice Canopy Using a Ground Polarimetric Scatterometer System Suk-Young Hong*, Jin-Young Hong**,

More information

, V2N(Vehicle to Nomadic Device) [3]., [4],[5]., V2V(Vehicle to Vehicle) V2I (Vehicle to Infrastructure) IEEE 82.11p WAVE (Wireless Access in Vehicula

, V2N(Vehicle to Nomadic Device) [3]., [4],[5]., V2V(Vehicle to Vehicle) V2I (Vehicle to Infrastructure) IEEE 82.11p WAVE (Wireless Access in Vehicula THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 215 Jul.; 26(7), 66 612. http://dx.doi.org/1.5515/kjkiees.215.26.7.66 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Dual-Band

More information

Journal of Educational Innovation Research 2018, Vol. 28, No. 1, pp DOI: * A Analysis of

Journal of Educational Innovation Research 2018, Vol. 28, No. 1, pp DOI: * A Analysis of Journal of Educational Innovation Research 2018, Vol. 28, No. 1, pp.99-117 DOI: http://dx.doi.org/10.21024/pnuedi.28.1.201803.99 2015 * A Analysis of the Characters and Issues about the 2015 Revised Social

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jul.; 27(7),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jul.; 27(7), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 16 Jul.; 27(7), 64662. http://dx.doi.org/./kjkiees.16.27.7.646 ISSN 1226-3133 (Print)ISSN 2288-226 (Online) 2D Microwave Image

More information

한국전지학회 춘계학술대회 Contents 기조강연 LI GU 06 초강연 김동욱 09 안재평 10 정창훈 11 이규태 12 문준영 13 한병찬 14 최원창 15 박철호 16 안동준 17 최남순 18 김일태 19 포스터 강준섭 23 윤영준 24 도수정 25 강준희 26

한국전지학회 춘계학술대회 Contents 기조강연 LI GU 06 초강연 김동욱 09 안재평 10 정창훈 11 이규태 12 문준영 13 한병찬 14 최원창 15 박철호 16 안동준 17 최남순 18 김일태 19 포스터 강준섭 23 윤영준 24 도수정 25 강준희 26 2015 한국전지학회 춘계학술대회 2일차 한국전지학회 춘계 학술대회(신소재 및 시장동향 관련 주제 발표) 시간 제목 비고 세션 1 차세대 이차전지용 in-situ 분석기술 좌장 : 윤성훈 09:00~09:30 Real-time & Quantitative Analysis of Li-air Battery Materials by In-situ DEMS 김동욱(한국화학연구원)

More information

<30365F28BFCFB7E129BEC8BAB4C5C22E687770>

<30365F28BFCFB7E129BEC8BAB4C5C22E687770> Current Photovoltaic Research 3(1) 27-31 (2015) pissn 2288-3274 Sulfurization 온도와 Cu/(In+Ga) 비가 Cu(In,Ga)Se 2 박막 내 S 함량에 미치는 영향 고영민ㆍ김지혜ㆍ신영민ㆍR. B. V. Chalapathyㆍ안병태* 한국과학기술원 신소재공학과, 대전시 유성구 대학로 291, 305-338

More information

11 함범철.hwp

11 함범철.hwp THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2012 Aug.; 23(8), 958 966. http://dx.doi.org/10.5515/kjkiees.2012.23.8.958 ISSN 1226-3133 (Print) LTCC Bluetooth/WiFi A Bluetooth/WiFi

More information

Microsoft Word - KSR2016S168

Microsoft Word - KSR2016S168 2016 년도 한국철도학회 춘계학술대회 논문집 KSR2016S168 GPR 을 이용한 자갈궤도 파울링층 파악을 위한 실내실험적 접근 Evaluation of Applicability of GPR to Detect Fouled Layer in Ballast Using Laboratory Tests 신지훈 *, 최영태 **, 장승엽 *** Ji-hoon. Shin

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 26(1),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 26(1), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Jan.; 26(1), 113118. http://dx.doi.org/10.5515/kjkiees.2015.26.1.113 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) A Retro-Directive

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 3, Mar (NFC: non-foster Circuit).,. (non-foster match

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 3, Mar (NFC: non-foster Circuit).,. (non-foster match THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Mar.; 26(3), 283 291. http://dx.doi.org/10.5515/kjkiees.2015.26.3.283 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Negative

More information

04 최진규.hwp

04 최진규.hwp THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Aug.; 26(8), 710717. http://dx.doi.org/10.5515/kjkiees.2015.26.8.710 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) RF ESPAR

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE May; 27(5),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE May; 27(5), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 May; 27(5), 454462. http://dx.doi.org/10.5515/kjkiees.2016.27.5.454 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Research

More information

±èÇ¥³â

±èÇ¥³â 533 Fig. 1. Dead zone. Nine echoes are positioned 2-10 mm below the scan surface with 1 mm distance. All nine echoes are clearly visualized. 534 Fig. 2. Vertical and horizontal measurement. 10 cm distance

More information

<313430333033C6AFC1FD28C3E0B1B8292E687770>

<313430333033C6AFC1FD28C3E0B1B8292E687770> 스포츠와 물리학: 구기운동 안티-싸커 와 간접-축구 DOI: 10.3938/PhiT.23.005 이 인 호 Anti-soccer and Indirect Soccer 편성은 없다고 장담한다. 벨기에(FIFA 랭킹 11위), 러시아 (FIFA 랭킹 22위), 알제리(FIFA 랭킹 26위), 그리고 한국(FIFA 랭킹 61위)으로 이어지는 H조 편성 결과이다. 이

More information

14.531~539(08-037).fm

14.531~539(08-037).fm G Journal of the Korea Concrete Institute Vol. 20, No. 4, pp. 531~539, August, 2008 š x y w m š gj p { sƒ z 1) * 1) w w Evaluation of Flexural Strength for Normal and High Strength Concrete with Hooked

More information

박선영무선충전-내지

박선영무선충전-내지 2013 Wireless Charge and NFC Technology Trend and Market Analysis 05 13 19 29 35 45 55 63 67 06 07 08 09 10 11 14 15 16 17 20 21 22 23 24 25 26 27 28 29 30 31 32 33 36 37 38 39 40

More information

09이훈열ok(163-

09이훈열ok(163- Korean Journal of Remote Sensing, Vol.27, No.2, 2011, pp.163~170 Change of Refractive Index of Air in X-band due to Atmospheric Humidity, Temperature and Pressure measured by GB-SAR Interferometry Jae-Hee

More information

<B5DEC7A5C1F628BCB1BCFBB1E82D E6169>

<B5DEC7A5C1F628BCB1BCFBB1E82D E6169> UV VIS Spectrometer NIR Spectrometer Fiber Optic Temperture Converter 3 Channel On-line Absorbance Monitoring System Color Sensor Integrating Sphere Raman System Tunable light source LIBS Pyrometer UV

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 26(12),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 26(12), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Dec.; 26(12), 1100 1107. http://dx.doi.org/10.5515/kjkiees.2015.26.12.1100 ISSN 1226-3133 (Print) ISSN 2288-226X (Online)

More information

10 이지훈KICS2015-03-068.hwp

10 이지훈KICS2015-03-068.hwp 논문 15-40-05-10 The Journal of Korean Institute of Communications and Information Sciences '15-05 Vol.40 No.05 http://dx.doi.org/10.7840/kics.2015.40.5.851 가로등 인프라를 활용한 안전한 스마트 방범 시스템 차 정 화, 이 주 용 *, 이

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 9, Sep GHz 10 W Doherty. [4]. Doherty. Doherty, C

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 26, no. 9, Sep GHz 10 W Doherty. [4]. Doherty. Doherty, C THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Sep.; 26(9), 783 789. http://dx.doi.org/10.5515/kjkiees.2015.26.9.783 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) GaN-HEMT

More information

45-51 ¹Ú¼ø¸¸

45-51 ¹Ú¼ø¸¸ A Study on the Automation of Classification of Volume Reconstruction for CT Images S.M. Park 1, I.S. Hong 2, D.S. Kim 1, D.Y. Kim 1 1 Dept. of Biomedical Engineering, Yonsei University, 2 Dept. of Radiology,

More information

RRH Class-J 5G [2].,. LTE 3G [3]. RRH, W-CDMA(Wideband Code Division Multiple Access), 3G, LTE. RRH RF, RF. 1 RRH, CPRI(Common Public Radio Interface)

RRH Class-J 5G [2].,. LTE 3G [3]. RRH, W-CDMA(Wideband Code Division Multiple Access), 3G, LTE. RRH RF, RF. 1 RRH, CPRI(Common Public Radio Interface) THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Mar.; 26(3), 276 282. http://dx.doi.org/10.5515/kjkiees.2015.26.3.276 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) RRH

More information

서강대학교 기초과학연구소대학중점연구소 심포지엄기초과학연구소

서강대학교 기초과학연구소대학중점연구소 심포지엄기초과학연구소 2012 년도기초과학연구소 대학중점연구소심포지엄 마이크로파센서를이용한 혈당측정연구 일시 : 2012 년 3 월 20 일 ( 화 ) 14:00~17:30 장소 : 서강대학교과학관 1010 호 주최 : 서강대학교기초과학연구소 Contents Program of Symposium 2 Non-invasive in vitro sensing of D-glucose in

More information

4 CD Construct Special Model VI 2 nd Order Model VI 2 Note: Hands-on 1, 2 RC 1 RLC mass-spring-damper 2 2 ζ ω n (rad/sec) 2 ( ζ < 1), 1 (ζ = 1), ( ) 1

4 CD Construct Special Model VI 2 nd Order Model VI 2 Note: Hands-on 1, 2 RC 1 RLC mass-spring-damper 2 2 ζ ω n (rad/sec) 2 ( ζ < 1), 1 (ζ = 1), ( ) 1 : LabVIEW Control Design, Simulation, & System Identification LabVIEW Control Design Toolkit, Simulation Module, System Identification Toolkit 2 (RLC Spring-Mass-Damper) Control Design toolkit LabVIEW

More information

12권2호내지합침

12권2호내지합침 14 OPTICAL SCIENCE AND TECHNOLOGY April 2008 15 16 OPTICAL SCIENCE AND TECHNOLOGY April 2008 17 18 OPTICAL SCIENCE AND TECHNOLOGY April 2008 19 20 OPTICAL SCIENCE AND TECHNOLOGY April 2008 21 22 OPTICAL

More information

200706_천문학사전_FTS_Pak_v1.hwp

200706_천문학사전_FTS_Pak_v1.hwp 푸리에변환분광기 (Fourier Transform Spectrometer) 해설자 : 박수종 ( 경희대학교우주과학과, 2007.06.29) 광학및적외선파장대에서사용하는분광기는작동원리에따라 (1) 빛의파장에따른굴절차이를이용하는프리즘분광기 ; (2) 빛의회절과간섭효과를이용하는격자분광기 ; (3) 빛의간섭효과를이용하는푸리에변환분광기 (Fourier Transform

More information

À±½Â¿í Ãâ·Â

À±½Â¿í Ãâ·Â Representation, Encoding and Intermediate View Interpolation Methods for Multi-view Video Using Layered Depth Images The multi-view video is a collection of multiple videos, capturing the same scene at

More information

자기공명영상장치(MRI) 자장세기에 따른 MRI 품질관리 영상검사의 개별항목점수 실태조사 A B Fig. 1. High-contrast spatial resolution in phantom test. A. Slice 1 with three sets of hole arr

자기공명영상장치(MRI) 자장세기에 따른 MRI 품질관리 영상검사의 개별항목점수 실태조사 A B Fig. 1. High-contrast spatial resolution in phantom test. A. Slice 1 with three sets of hole arr Original Article pissn 1738-2637 J Korean Soc Radiol 2012;67(2):129-134 The Survey of Magnetic Resonance Imaging Quality according to in Korea 1 자기공명영상장치(MRI) 자장세기에 따른 MRI 품질관리 영상검사의 개별항목점수 실태조사 1 Hyun-Hae

More information

8-VSB (Vestigial Sideband Modulation)., (Carrier Phase Offset, CPO) (Timing Frequency Offset),. VSB, 8-PAM(pulse amplitude modulation,, ) DC 1.25V, [2

8-VSB (Vestigial Sideband Modulation)., (Carrier Phase Offset, CPO) (Timing Frequency Offset),. VSB, 8-PAM(pulse amplitude modulation,, ) DC 1.25V, [2 VSB a), a) An Alternative Carrier Phase Independent Symbol Timing Offset Estimation Methods for VSB Receivers Sung Soo Shin a) and Joon Tae Kim a) VSB. VSB.,,., VSB,. Abstract In this paper, we propose

More information

Analyses the Contents of Points per a Game and the Difference among Weight Categories after the Revision of Greco-Roman Style Wrestling Rules Han-bong

Analyses the Contents of Points per a Game and the Difference among Weight Categories after the Revision of Greco-Roman Style Wrestling Rules Han-bong Analyses the Contents of Points per a Game and the Difference among Weight Categories after the Revision of Greco-Roman Style Wrestling Rules Han-bong An 1 & Kyoo-jeong Choi 2 * 1 Korea National Wrestling

More information

012임수진

012임수진 Received : 2012. 11. 27 Reviewed : 2012. 12. 10 Accepted : 2012. 12. 12 A Clinical Study on Effect of Electro-acupuncture Treatment for Low Back Pain and Radicular Pain in Patients Diagnosed with Lumbar

More information

<313630313032C6AFC1FD28B1C7C7F5C1DF292E687770>

<313630313032C6AFC1FD28B1C7C7F5C1DF292E687770> 양성자가속기연구센터 양성자가속기 개발 및 운영현황 DOI: 10.3938/PhiT.25.001 권혁중 김한성 Development and Operational Status of the Proton Linear Accelerator at the KOMAC Hyeok-Jung KWON and Han-Sung KIM A 100-MeV proton linear accelerator

More information

,.. 2, , 3.. 본론 2-1 가상잡음신호원생성원리, [8].,. 1.,,. 4 km (13.3 μs).,. 2 (PN code: Pseudo Noise co- 그림 2. Fig. 2. Pseudo noise code. de). (LFSR: Line

,.. 2, , 3.. 본론 2-1 가상잡음신호원생성원리, [8].,. 1.,,. 4 km (13.3 μs).,. 2 (PN code: Pseudo Noise co- 그림 2. Fig. 2. Pseudo noise code. de). (LFSR: Line THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2015 Jun; 26(6), 546 554. http://dx.doi.org/10.5515/kjkiees.2015.26.6.546 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Proof-of-Concept

More information

07-1960(JH)

07-1960(JH) 한국두피모발미용학회지 제5권 제1호 2009 The Journal of Beauty & Trichology 5(1), 00~00(2008) 1960년대 뷰티 및 패션트렌드 분석 - 모델 트위기 (Twiggy) 를 중심으로 - 김희선* 안양과학대학 뷰티디자인학부 Analysis of Beauty and Fashion trends in the 1960 s - Focusing

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct , EBG. [4],[5],. double split ring resonator (D

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 29, no. 10, Oct , EBG. [4],[5],. double split ring resonator (D THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Oct.; 29(10), 739 744. http://dx.doi.org/10.5515/kjkiees.2018.29.10.739 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) DSRR

More information

29 Ⅰ. 서론 물리학자들이 전파의 이론을 정립한 이후, 이를 기술적으로 실현함은 물론 적정 수준의 19세기 물리학자인 페러데이, 맥스웰, 헤르츠 등의 연구 결과로 인류는 전기장과 자기장의 변화 에 따른 전파를 만들어 낼 수 있게 되었고, 인류에 게 있어 없어서는 안되

29 Ⅰ. 서론 물리학자들이 전파의 이론을 정립한 이후, 이를 기술적으로 실현함은 물론 적정 수준의 19세기 물리학자인 페러데이, 맥스웰, 헤르츠 등의 연구 결과로 인류는 전기장과 자기장의 변화 에 따른 전파를 만들어 낼 수 있게 되었고, 인류에 게 있어 없어서는 안되 Journal of Communications & Radio Spectrum SPECIAL ISSUE 28 TREND REPORT 통신 및 비통신용 전파응용 기술 이슈 및 시사점 글 황태욱 경희대학교 연구교수 (031) 201-3254, twhwang@khu.ac.kr 주제어: 밀리미터파, 테라헤르츠파, 전파응용 기술, ISM 기기 전파자원의 부족문제에 대한

More information

TEL:02)861-1175, FAX:02)861-1176 , REAL-TIME,, ( ) CUSTOMER. CUSTOMER REAL TIME CUSTOMER D/B RF HANDY TEMINAL RF, RF (AP-3020) : LAN-S (N-1000) : LAN (TCP/IP) RF (PPT-2740) : RF (,RF ) : (CL-201)

More information

Æ÷Àå½Ã¼³94š

Æ÷Àå½Ã¼³94š Cho, Mun Jin (E-mail: mjcho@ex.co.kr) ABSTRACT PURPOSES : The performance of tack coat, commonly used for layer interface bonding, is affected by application rate and curing time. In this study, bonding

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 26(3),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Mar.; 26(3), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 215 Mar.; 26(3), 248 256. http://dx.doi.org/1.5515/kjkiees.215.26.3.248 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Metal

More information

Electronics and Telecommunications Trends 포토닉스기반테라헤르츠무선통신기술동향 Photonics-based Terahertz Wireless Communication 김현수 (H.S. Kim, 이

Electronics and Telecommunications Trends 포토닉스기반테라헤르츠무선통신기술동향 Photonics-based Terahertz Wireless Communication 김현수 (H.S. Kim, 이 Electronics and Telecommunications Trends 포토닉스기반테라헤르츠무선통신기술동향 Photonics-based Terahertz Wireless Communication 김현수 (H.S. Kim, kimhyunsoo@etri.re.kr) 이의수 (E.S. Lee, euisu@etri.re.kr) 박동우 (D.W. Park, dwpark@etri.re.kr)

More information

<283732372D3733312920B4D9C3CAC1A120BCD2C7C1C6AEC4DCC5C3C6AEB7BBC1EEC0C720B3EBBEC8C0C720BDC3B7C2BAB8C1A4BFA120B4EBC7D120C0AFBFEBBCBA20C6F2B0A1283035292E687770>

<283732372D3733312920B4D9C3CAC1A120BCD2C7C1C6AEC4DCC5C3C6AEB7BBC1EEC0C720B3EBBEC8C0C720BDC3B7C2BAB8C1A4BFA120B4EBC7D120C0AFBFEBBCBA20C6F2B0A1283035292E687770> 대한안과학회지 제 49 권 제 5 호 2008 J Korean Ophthalmol Soc 49(5):727-731, 2008 DOI : 10.3341/jkos.2008.49.5.727 다초점 소프트콘택트렌즈의 노안의 시력보정에 대한 유용성 평가 김현경 1 김효명 2 정성근 1 가톨릭대학교 의과대학 성모병원 안과학교실 1, 고려대학교 의과대학 안암병원 안과학교실

More information

실험 5

실험 5 실험. OP Amp 의기초회로 Inverting Amplifier OP amp 를이용한아래와같은 inverting amplifier 회로를고려해본다. ( 그림 ) Inverting amplifier 위의회로에서 OP amp의 입력단자는 + 입력단자와동일한그라운드전압, 즉 0V를유지한다. 또한 OP amp 입력단자로흘러들어가는전류는 0 이므로, 저항에흐르는전류는다음과같다.

More information

(

( 317 318 319 320 1 3 5 5 5 5 2 321 : 1.,,,,, 06 2. X-ray beam penetration (density) (contrast) 03 3. patch coating, precipitation, flaking 03 4. centering 03 5. Esophagus, cardia, fundus, body, angle, antrum,

More information

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA The e-business Studies Volume 17, Number 6, December, 30, 2016:237~251 Received: 2016/11/20, Accepted: 2016/12/24 Revised: 2016/12/21, Published: 2016/12/30 [ABSTRACT] Recently, there is an increasing

More information

63-69±è´ë¿µ

63-69±è´ë¿µ Study on the Shadow Effect of 3D Visualization for Medical Images ased on the Texture Mapping D.Y. Kim, D.S. Kim, D.K. Shin, D.Y. Kim 1 Dept. of iomedical Engineering, Yonsei University = bstract = The

More information

歯A1.1함진호.ppt

歯A1.1함진호.ppt The Overall Architecture of Optical Internet ETRI ? ? Payload Header Header Recognition Processing, and Generation A 1 setup 1 1 C B 2 2 2 Delay line Synchronizer New Header D - : 20Km/sec, 1µsec200 A

More information

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA The e-business Studies Volume 17, Number 4, August, 30, 2016:319~332 Received: 2016/07/28, Accepted: 2016/08/28 Revised: 2016/08/27, Published: 2016/08/30 [ABSTRACT] This paper examined what determina

More information

03 장태헌.hwp

03 장태헌.hwp THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2013 Aug.; 24(8), 772 780. http://dx.doi.org/10.5515/kjkiees.2013.24.8.772 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) HEMP

More information

PowerPoint Presentation

PowerPoint Presentation 신호조절 (Signal Conditioning) 메카트로닉스 시스템의 구성 ECU 인터페이스 회로 (시그널 컨디셔닝) 마이컴 Model of 기계 시스템 인터페이스 회로 (드라이빙 회로) 센서 액츄에이터 (구동기) 기계 시스템 PN 접합 다이오드 [1] 다이오드의 DC 해석과 등가모델 [1] 다이오드의 DC 해석과 등가모델 [1] 다이오드 응용회로 [1] 다이오드

More information

28 저전력복합스위칭기반의 0.16mm 2 12b 30MS/s 0.18um CMOS SAR ADC 신희욱외 Ⅰ. 서론 Ⅱ. 제안하는 SAR ADC 구조및회로설계 1. 제안하는 SAR ADC의전체구조

28 저전력복합스위칭기반의 0.16mm 2 12b 30MS/s 0.18um CMOS SAR ADC 신희욱외 Ⅰ. 서론 Ⅱ. 제안하는 SAR ADC 구조및회로설계 1. 제안하는 SAR ADC의전체구조 Journal of The Institute of Electronics and Information Engineers Vol.53, NO.7, July 2016 http://dx.doi.org/10.5573/ieie.2016.53.7.027 ISSN 2287-5026(Print) / ISSN 2288-159X(Online) 논문 2016-53-7-4 c Abstract

More information

4 5 6 7 8 9 10 11 12 13 14 15 조 희 영 선 생 님 고 맙 습 니 다 16 17 18 19 가정간호 장선미 간호사님 감사합니다 20 21 22 23 24 25 U l 26 27 p SEOUL MEDICAL CENTER NEWS 28 29 30 31 32 33 34 35 36 37 홍보실장이란 신동규 원고를 기다립니다

More information

<353420B1C7B9CCB6F52DC1F5B0ADC7F6BDC7C0BB20C0CCBFEBC7D120BEC6B5BFB1B3C0B0C7C1B7CEB1D7B7A52E687770>

<353420B1C7B9CCB6F52DC1F5B0ADC7F6BDC7C0BB20C0CCBFEBC7D120BEC6B5BFB1B3C0B0C7C1B7CEB1D7B7A52E687770> Journal of the Korea Academia-Industrial cooperation Society Vol. 13, No. 2 pp. 866-871, 2012 http://dx.doi.org/10.5762/kais.2012.13.2.866 증강현실을 이용한 아동교육프로그램 모델제안 권미란 1*, 김정일 2 1 나사렛대학교 아동학과, 2 한세대학교 e-비즈니스학과

More information

00내지1번2번

00내지1번2번 www.keit.re.kr 2011. 11 Technology Level Evaluation ABSTRACT The Technology Level Evaluation assesses the current level of industrial technological development in Korea and identifies areas that are underdeveloped

More information

00....

00.... Fig. 1 2.5%. 51.5%, 46.0%,.. /, Table 1 (U.V.; Ultraviolet 10-400 nm)/ (NIR; Near Infrared 700 nm - 5 µm) ( TiO 2, WO 3, ZnO, CeO, ATO, Sb 2O 3-ZnO, ITO.) (400 nm - 780 nm). /. Fig. 1.. 23 Table 1. / /

More information

6 10 GHz InGaAs 0.15 μm 27 dbm GHz,, DAADetection And Avoid,. UWB. UWB 41.3 dbm/ MHz.,,, PRFPulse Repetition Frequency., UWB IC. UWB PA [1]

6 10 GHz InGaAs 0.15 μm 27 dbm GHz,, DAADetection And Avoid,. UWB. UWB 41.3 dbm/ MHz.,,, PRFPulse Repetition Frequency., UWB IC. UWB PA [1] THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2018 Oct.; 2910, 766 772. http://dx.doi.org/10.5515/kjkiees.2018.29.10.766 ISSN 1226-3133 Print ISSN 2288-226X Online 6 10 GHz

More information

-

- World Top 10 by 2030 CONTENTS CONTENTS 02 03 PRESIDENT S MESSAGE 04 05 VISION GOALS VISION GOALS STRATEGIES 06 07 HISTORY 2007 2008 2009 2010 2011 08 09 UNIST POWER 10 11 MPI USTC UNIST UCI UTD U-M GT

More information

유기 발광 다이오드의 전하주입 효율 향상을 통한 발광효율 향상 연구

유기 발광 다이오드의 전하주입 효율 향상을 통한 발광효율 향상 연구 - i - - ii - - iii - - iv - - v - - vi - 그림차례 - vii - - viii - - 1 - 5). - 2 - - 3 - 유기발광다이오드 ( 고분자또는저분자 ) 무기발광다이오드 (p-n junction LED) - + cathode ETL EML HTL HIL anode 발광 두께 : 100 ~ 200 nm 양극 ( 투명전극,

More information

jaeryomading review.pdf

jaeryomading review.pdf 4 5 6 7 8 9 10 11 12 13 1. S. Kim, H. Y. Jeong, S. K. Kim, S. Y. Choi and K. J. Lee, Nano Lett. 11, 5438 (2011). 2. E. Menard, K. J. Lee, D. Y. Khang, R. G. Nuzzo and J. A. Rogers, Appl. Phys. Lett. 84,

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug [3]. ±90,.,,,, 5,,., 0.01, 0.016, 99 %... 선형간섭

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 27, no. 8, Aug [3]. ±90,.,,,, 5,,., 0.01, 0.016, 99 %... 선형간섭 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Aug.; 27(8), 693700. http://dx.doi.org/10.5515/kjkiees.2016.27.8.693 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Design

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 28(2),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 28(2), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2017 Feb.; 28(2), 129138. http://dx.doi.org/10.5515/kjkiees.2017.28.2.129 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) PT- Doppler

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 27(1), ISSN

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Jan.; 27(1), ISSN THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 216 Jan.; 27(1), 17. http://dx.doi.org/1.5515/kjkiees.216.27.1.1 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Switch 1.5 GHz

More information

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA 특집 레이저 50주년특집 - 레이저의 발전과 응용 1. 파이버 레이저(Fiber LASER)란? 1.1 레이저의 구성 및 원리 LASER(LightAmplificationbyStimulatedEmissionofRa 그림 2. rod-type 고체레이저의 열 영향 문제 diation)란, 외부의 자극에 의해 매질로부터 빛을 방출하게 하고, 공진기에 의해 증폭된

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep [1]. RFID.,,,,,,, /,,, (,,,, ) [2] [4].., ( 99

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. vol. 28, no. 9, Sep [1]. RFID.,,,,,,, /,,, (,,,, ) [2] [4].., ( 99 THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2017 Sep.; 28(9), 679 684. http://dx.doi.org/10.5515/kjkiees.2017.28.9.679 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) UHF

More information

05 목차(페이지 1,2).hwp

05 목차(페이지 1,2).hwp THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2014 Apr.; 25(4), 418 425. http://dx.doi.org/10.5515/kjkiees.2014.25.4.418 ISSN 1226-3133 (Print) ISSN 2288-226X (Online) Doppler

More information

Can032.hwp

Can032.hwp Chromosomal Alterations in Hepatocellular Carcinoma Cell Lines Detected by Comparative Genomic Hybridization Sang Jin Park 1, Mahn Joon Ha, Ph.D. 1, Hugh Chul Kim, M.D. 2 and Hyon Ju Kim, M.D. 1 1 Laboratory

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 27(12),

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Dec.; 27(12), THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 2016 Dec.; 27(12), 1036 1043. http://dx.doi.org/10.5515/kjkiees.2016.27.12.1036 ISSN 1226-3133 (Print) ISSN 2288-226X (Online)

More information

Crt114( ).hwp

Crt114( ).hwp cdna Microarray Experiment: Design Issues in Early Stage and the Need of Normalization Byung Soo Kim, Ph.D. 1, Sunho Lee, Ph.D. 2, Sun Young Rha, M.D., Ph.D. 3,4 and Hyun Cheol Chung, M.D., Ph.D. 3,4 1

More information

DBPIA-NURIMEDIA

DBPIA-NURIMEDIA 박건수 *, 서태영 **, 김종욱 *** ". 요약 Abstract The induction melting furnace using electric generator has been introduced since 1920s, and it began to be widely applied to industrial applications due to increasing

More information

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 29(2), IS

THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE Feb.; 29(2), IS THE JOURNAL OF KOREAN INSTITUTE OF ELECTROMAGNETIC ENGINEERING AND SCIENCE. 218 Feb.; 29(2), 7782. http://dx.doi.org/1.5515/kjkiees.218.29.2.77 ISSN 1226-3133 (Print)ISSN 2288-226X (Online) Transmission

More information