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- 저자 : 김건욱 (검색결과 212 건)
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격자형 및 평형 구조를 가지는 박막공진 여파기에 관한 연구
김건욱,구명권,육종관,박한규 한국전자파학회 2002 한국전자파학회논문지 Vol.13 No.10
In this paper, thin film bulk acoustic resonator(TFBAR) lattice and balanced type filter topologies are designed and fabricated. Aluminium nitride and platinum are used for piezoelectric material and top and bottom electrodes, respectively. Air-gap is placed to avoid silicon substrate loading effect and the performance of these lattice and balanced filters is compared with ladder filters. These filters have selectivity over 15 dB for lattice type and 30 dB for balanced type and reveal wider bandwidth of the ladder filters. For balanced type filters, minor tuning procedure is not needed and they are readily available for RF filter in wireless applications.
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김건욱,박현제,김훈수,김수한,고현창,김병수,김문범 대한피부과학회 2011 Annals of Dermatology Vol.23 No.1
Herein, we report a case of an 8-year-old girl with dapsone hypersensitivity syndrome (DHS) that occurred during the treatment of erythema elevatum diutinum. She had fever,gross hematuria, and malaise for three weeks after initiation of dapsone therapy. Five days after stopping dapsone treatment, she returned to the emergency clinic because of high fever, emesis, diarrhea, upper respiratory symptoms,and worsening of exanthematous eruptions. A diagnosis of DHS was made, and it improved with oral prednisone. We recommend that pediatric patients who are treated with dapsone need to be observed carefully for the development of DHS. (Ann Dermatol 23(S3) S290∼S295, 2011) Dapsone Hypersensitivity Syndrome That Occurred during Treatment of Pediatric Patient with Erythema Elevatum Diutinum
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Analysis of free field for Acoustic Anechoic Chamber based on Time Stretched Pulse
김건욱 大韓電子工學會 2012 電子工學會論文誌-SP (Signal processing) Vol.49 No.4
Time Stretched Pulse (TSP)는 공간적으로 임펄스(Impulse)를 효율적으로 전달하고 분석하기 위해서 사용되어 진다. 하지만 발신기와 수신기의 전달함수를 포함시키지 않으면, 시간 영역에서의 분석은 직, 간접 신호의 중첩으로 공간의 자유음장 특성을 파악하기 불가능하다. 일반적으로 공간의 자유음장(Free Field)은 표준 ISO 3745 Annex A에 의해서 평가되고 있는데, 일정 주파수 간격의 1/3 옥타브 밴드 신호를 연속적으로 발신 및 수신하여 거리별 신호 감소를 역자승 법칙(Inverse Square Law)을 적용하여 판단하고 있다. 본 논문은 자유음장 분석에서 TSP 신호를 적용하여 일반적인 ISO 3745의 1/3 옥타브 밴드 신호와 비교하였다. 역자승 모델 값과의 차이점을 분석한 결과 TSP 신호 또한 1/3 옥타브 밴드 신호와 유사한 결과를 보이고 있으며, 측정 시간 및 확장성에 대해서는 우수하게 판단되었다. 본 실험에서는 ISO 3745에 의해서 제한된 주파수 범위에서 자유음장과 반자유음장 (Hemi-free Field)을 검증 받은 무향실을 사용하였다. Time Stretched Pulse (TSP) is used for transmitting and analyzing the impulse signal over the designated spatial place. However, if transfer functions of transmitter and receiver are unknown, performance investigation of free field in temporal domain is barely possible due to the overlap between the direct and indirect signal from the space. Generally, the free field or hemi-free field is evaluated by the Annex A of ISO 3745 in which utilizing the inverse square law with one-third octave band signals. In this paper, the author performs analysis of free field via applying TSP with inverse square law and the results are compared with the one-third octave band signals. According to the analysis of deviation between the corresponding signal and inverse square law model, the proposed TSP method provides the comparable performance index to the one-third octave band signal with reduced measuring time. Provided that the pre-whitening can be implementable by employing the speaker and microphone transfer function, further analyses from TSP compression are able to be performed such as multipath separation from time domain data. The anechoic chamber used in this experiment is verified conformance with ISO 3745 for free field and hemi-free field condition for limited frequency of the signal.
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