• 제목/요약/키워드: Engineering School

검색결과 60,599건 처리시간 0.07초

Strain-imposed External Cavity Tunable Lasers Operating for NIR Wavelength

  • Kim, Jun-Whee;Kim, Kyung-Jo;Son, Nam-Seon;Oh, Min-Cheol
    • Journal of the Optical Society of Korea
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    • 제17권2호
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    • pp.172-176
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    • 2013
  • For demonstrating widely tunable external cavity lasers operating for near-infrared (NIR) wavelength, a flexible polymer waveguide with an imbedded Bragg grating is incorporated. Due to the superior flexibility of the polymer material, the reflection wavelength of the Bragg grating is widely tunable by imposing tensile and compressive strains on the flexible Bragg grating. A third-order Bragg grating is formed on the device for facilitating the fabrication method. With a superluminescent laser diode as a gain medium of ECL, the tunable laser exhibited output power of -3 dBm and a tuning range of 32 nm.

배터리 수명진단을 위한 LabView 기반 임피던스 측정 시스템 (Battery Diagnosis by using Impedance Measurement System based on Labview)

  • 김선혁;이형민;권구영;조우진;박인준;최우준;채영철;신용준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2015년도 제46회 하계학술대회
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    • pp.605-606
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    • 2015
  • 본 논문에서는 배터리의 상태 진단을 위한 임피던스 측정시스템을 제시한다. Labview를 이용한 임피던스 측정 시스템은 저가에서 구성할 수 있고, 변화되는 임피던스를 확인이 가능해 수명을 진단하는 지표로 이용 가능하다. 제시된 임피던스 측정 방법은 용량에 상관없이 측정이 가능하고, 기존의 장치보다 측정과 값을 계산하기가 간단하다. 또한, 고가의 장비를 이용하지 않고도, Labview와 DAQ를 이용하여 정확성 높은 결과를 구할 수 있다.

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High Performance On-Chip Integrable Inductor for RF Applications

  • Lee, J.Y.;Kim, J.H.;Kim, M.J.;Moon, S.S.;Kim, I.H.;Lee, Y.H.;Yook, Jong-Gwan;Kukjin Chun
    • 반도체디스플레이기술학회지
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    • 제2권1호
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    • pp.11-14
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    • 2003
  • The high Q(quality factor) suspended spiral inductors were fabricated on the silicon substrate by 3D surface micromachined process. The integration of 2.4GHz VCO has been performed by fabricating suspended spiral inductor of the top of CMOS VCO circuit. The phase noise of VCO integrated MEMS inductor is 93.5 dBc/Hz at 100kHz of offset frequency.

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A new absorbing foam concrete: preparation and microwave absorbing properties

  • Xingjun, Lv;Mingli, Cao;Yan, Li;Xin, Li;Qian, Li;Rong, Tang;Qi, Wang;Yuping, Duan
    • Advances in concrete construction
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    • 제3권2호
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    • pp.103-111
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    • 2015
  • The foam concrete was fabricated by adding the foaming agent which composite ordinary Portland cement with plant and animal protein into cement paste, and the electromagnetic wave absorption properties were studied for the first time as well. The studies showed that the electromagnetic waves can be absorbed by multiple reflections and scattering within the porous material. Thickness and filling ratio have a great influence on the electromagnetic wave absorbing properties in 2-18 GHz of the foam concrete, the greater the thickness, the better the performance of absorption; filling ratio was about 52 vol.%, the absorbing properties achieved the best.