• Title/Summary/Keyword: Lee In-Bae

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Performance Evaluation of A Tunable Dispersion Compensator based on Strain-Chirped Fiber Bragg Grating in a 40 Gb/s Transmission Link

  • Kim, Chul-Han;Bae, Jun-Key;Lee, Kwan-Il;Lee, Sang-Bae
    • Journal of the Optical Society of Korea
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    • v.12 no.4
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    • pp.244-248
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    • 2008

  • We have evaluated the performance of strain-chirped fiber Bragg grating (FBG) based tunable dispersion compensator in a 40 Gb/s transmission link. In our proposed compensator, the value of dispersion could be changed from -353 ps/nm to -962 ps/nm by adjusting the rotation angle of the metal beam on which the FBG was mounted. In order to evaluate the effect of ripples in reflectivity and variations in passband of the FBG based dispersion compensator, transmission performance has been measured with our tunable dispersion compensator. Error-free transmission of a 40 Gb/s non-return-to-zero (NRZ) signal over conventional single-mode fiber (SMF) was achieved.

  • https://doi.org/10.3807/JOSK.2008.12.4.244 인용 PDF KSCI

Usefulness of Multi-Detector Computed Tomography before Bronchoscopy and/or Bronchial Arterial Embolization for Hemoptysis (객혈 환자에서 기관지경술이나 기관지동맥색전술 시행 전의 다중절편 전산화 단층촬영의 유용성)

  • Lee, Shin-Jae;Rho, Ji-Young;Yoo, Seung-Min;Kim, Man-Deuk;Lee, Ji-Hyun;Kim, Eun-Kyung;Cho, Young-Ah;Lee, Sang-Min
    • Tuberculosis and Respiratory Diseases
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    • v.68 no.2
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    • pp.80-86
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    • 2010

  • Background: Recently, many institutions have acquired multi-detector computed tomography (MDCT) systems. This made it easier and more convenient to use MDCT as a initial diagnostic modality for hemoptysis. The purpose of this study was to evaluate the usefulness of MDCT before bronchoscopy and/or bronchial arterial embolization (BAE) for hemoptysis. Methods: We studied a total of 125 patients with hemoptysis who underwent, between 2006 and 2008, MDCT in a routine protocol before bronchoscopy and/or BAE. One hundred two patients underwent bronchoscopy and 29 patients underwent BAE. We compared the usefulness of MDCT and bronchoscopy for detecting the bleeding site and identifying the cause. We also evaluated our ability, using MDCT, to detect instances where the bronchial artery caused hemoptysis. Results: The rate of detection of a bleeding site was 75.5% on MDCT and 50.9% on bronchoscopy. MDCT and bronchoscopy detected the bleeding site in agreement in 62.7% of patients. MDCT alone found the bleeding site in 27.5% of cases. MDCT identified the cause of hemoptysis in 77.5% and bronchoscopy in 11.8%. In 29 patients who underwent BAE, we detected a total of 37 hypertrophied bronchial arteries that were causing hemoptysis. Of 37 bronchial arteries, 23 (62.2%) were depicted on MDCT. Conclusion: MDCT is superior to bronchoscopy for detecting the bleeding site and identifying the cause of hemoptysis. MDCT can also predict the side of affected bronchial artery with depiction of hypertrophied bronchial artery and localizing the bleeding site. Doing MDCT before bronchoscopy and BAE can provide a guideline for the next step.

  • https://doi.org/10.4046/trd.2010.68.2.80 인용 PDF KSCI