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RISS 인기검색어
- 검색키워드
- 저자 : Devi Sivaraman (검색결과 2 건)
- 무료
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Design and Analysis of Two Stage Model for Effective Beam forming using MATLAB and VerilogHDL
Devi Sivaraman,Ajith Kumar P.C,Sundaramoorthy T,Neeraj Kr. Shukla 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.4
Beam forming is a technique in signal processing that has found widespread applications in fields such as radar, wireless communication, bio-medical ultrasounds and so on. Beam forming consist of an array of antennas whose radiation pattern are adjusted to a particular direction. This paper aims in implementing a two stage design for acoustic beam forming using MATLAB and Verilog HDL. First stage is a delay and sum beam former used to obtain beams from a particular direction while the second stage is an LMS model based on Least Mean Square (LMS) algorithm. This stage improves the efficiency of delay sum by removing the unwanted signals. Different hardware parameters like logic utilization, memory usage, CPU time and delay of this design are analyzed to determine its characteristics as compared to delay sum and LMS. This study found that the two stage model gives better beam forming and noise removal than when the stages are implemented independently.
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Leaking Thoracic Aorta Aneurysm Causing Pleural Effusion: A Potential Disaster
( Khai Lip Ng ),( Hema Yamini Devi A ),( P Yamarmuty ),( Kunji Kannan A/l Sivaraman Kannan ) 대한결핵 및 호흡기학회 2021 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.129 No.-
Introduction Thoracentesis is the first step in diagnosing a unilateral pleural effusion. Although malignancy remains the most common cause of a hemoserous effusion, we must be aware of other causes such as uremia, pulmonary infarction, post cardiac injury syndrome etc. We report a rare case of leaking thoracic aortic aneurysm masquerading as a unilateral hemoserous pleural effusion. Case Report A 79-year-old female with underlying hypertension, dyslipidemia and chronic kidney disease presented with a 2-weeks history of cough and dyspnea. She also reported a weight loss of 5 kilograms in 1 month. A Chest X-Ray (CXR) on presentation revealed a large left pleural effusion. She has exudative effusion based on Light's criteria. pleural fluid culture and cytology was negative. As her main differential diagnosis was malignancy, she was subjected to pleuroscopy to obtain a tissue diagnosis. During pleuroscopy, 1 liter of hemoserous fluid was drained. Apart from thickened parietal pleura, a large cystic mass was seen adhered to the parietal pleura posteriorly. Biopsies were taken from the parietal pleura and decision was made not to biopsy or aspirate the cystic mass during pleuroscopy. Computed tomography of the thorax done few weeks later showed a large thoracic aorta aneurysm with multiple penetrating atherosclerotic ulcers and mural thrombus. There was no pleural or lung mass detected. Patient was counseled for surgical repair but opted for conservative management. Discussion and conclusion Leaking thoracic aneurysm is an uncommon but potentially dangerous cause of hemoserous pleural effusion. A blind thoracentesis or biopsy of the cystic mass during pleuroscopy would have led to rupture of the aneurysm. Depending on the clinical context, it is safer to obtain a CT thorax prior to pleuroscopy when dealing with undiagnosed pleural effusion.
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