• 한국전자파학회논문지
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• 제26권1호
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• pp.63-70
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• 2015

본 논문에서는 $0.11{\mu}m$ CMOS 공정을 이용한 900 MHz 대역의 RFID 통신 수신단을 제안한다. 본 RFID 수신단은 포락선 검출기와 저역 통과 필터, 비교기와 D-플립플롭, 그리고 디지털 블록의 클록을 공급하기 위한 발진기가 집적된 형태이며, 저전력으로 구동하도록 설계하여 수동 RFID 통신용 태그에 적합하게 하였다. 본 수신단은 종래의 아날로그 데이터 슬라이서가 아닌 디지털 데이터 슬라이서를 사용함으로써 전력 소모를 줄였다. 클록의 주파수는 1.68 MHz이고, 소비전력은 $5{\mu}W$이며, 제작된 회로의 크기는 측정 패드를 제외하고 $325{\mu}m{\times}290{\mu}m$이다.

• Journal of Korean Neurosurgical Society
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• 제64권4호
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• pp.514-523
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• 2021

Objective : Aneurysm volume quantification (AVQ) using the equation of ellipsoid volume is widely used although it is inaccurate. Furthermore, AVQ with 3-dimensional (3D) rendered data has limitations in general use. A novel universal method for AVQ is introduced for any diagnostic modality and application to any shape of aneurysms. Methods : Relevant AVQ studies published from January 1997 to June 2019 were identified to determine common methods of AVQ. The basic idea is to eliminate the normal artery volume from 3D model with the aneurysm. After Digital Imaging and Communications in Medicine (DICOM) data is converted and exported to stereolithography (STL) file format, the 3D STL model is modified to remove the aneurysm and the volume difference between the 3D model with/without the aneurysm is defined as the aneurysm volume. Fifty randomly selected aneurysms from DICOM database were used to validate the different AVQ methods. Results : We reviewed and categorized AVQ methods in 121 studies. Approximately 60% used the ellipsoid method, while 24% used the 3D model. For 50 randomly selected aneurysms, volumes were measured using 3D Slicer, RadiAnt, and ellipsoid method. Using 3D Slicer as the reference, the ratios of mean difference to mean volume obtained by RadiAnt and ellipsoid method were -1.21±7.46% and 4.04±30.54%, respectively. The deviations between RadiAnt and 3D Slicer were small despite of aneurysm shapes, but those of ellipsoid method and 3D Slicer were large. Conclusion : In spite of inaccuracy, ellipsoid method is still mostly used. We propose a novel universal method for AVQ that is valid, low cost, and easy to use.