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104. Arterial Distension Monitoring Scheme Using FPGA-Based Inference Machine in Ultrasound Scanner Circuit System

Author

Lee, Young-Chan, Ko, Doo-Hyeon, Son, Min-Hyeong, Yang, Se-Hwan, and Um, Ji-Yong

Abstract

This paper presents an arterial distension monitoring scheme using a field-programmable gate array (FPGA)-based inference machine in an ultrasound scanner circuit system. An arterial distension monitoring requires a precise positioning of an ultrasound probe on an artery as a prerequisite. The proposed arterial distension monitoring scheme is based on a finite state machine that incorporates sequential support vector machines (SVMs) to assist in both coarse and fine adjustments of probe position. The SVMs sequentially perform recognitions of ultrasonic A-mode echo pattern for a human carotid artery. By employing sequential SVMs in combination with convolution and average pooling, the number of features for the inference machine is significantly reduced, resulting in less utilization of hardware resources in FPGA. The proposed arterial distension monitoring scheme was implemented in an FPGA (Artix7) with a resource utilization percentage less than 9.3%. To demonstrate the proposed scheme, we implemented a customized ultrasound scanner consisting of a single-element transducer, an FPGA, and analog interface circuits with discrete chips. In measurements, we set virtual coordinates on a human neck for 9 human subjects. The achieved accuracy of probe positioning inference is 88%, and the Pearson coefficient (r) of arterial distension estimation is 0.838.

Published
2024
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111. Isocoumarins and Benzoquinones with Their Proprotein Convertase Subtilisin/Kexin Type 9 Expression Inhibitory Activities from Dried Roots of Lysimachia vulgaris

Author

Pel, Pisey, primary, Kim, Young-Mi, additional, Kim, Hyun Ji, additional, Nhoek, Piseth, additional, An, Chae-Yeong, additional, Son, Min-Gyung, additional, Won, Hongic, additional, Lee, Seung Eun, additional, Lee, Jeonghoon, additional, Kim, Hyun Woo, additional, Choi, Young Hee, additional, Lee, Chang Hoon, additional, and Chin, Young-Won, additional

Published
2022
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138. Folksonomy-Based Collaborative Tagging System for Classifying Visualized Information in Design Practice

Author

Jung, Hyun-oh, Son, Min-shik, Lee, Kun-pyo, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Smith, Michael J., editor, and Salvendy, Gavriel, editor

Published
2007
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147. Effects of nitrogen film cooling on ignition transition of gaseous oxygen/kerosene spray combustor.

Author

Song, Wooseok, Shin, Dongsoo, Son, Min, and Koo, Jaye

Subjects
KEROSENE, COMBUSTION chambers, PRESSURE transducers, DYNAMIC pressure, NITROGEN, FLAME, PROPELLANTS
Abstract

The effects of nitrogen film cooling on ignition transition under different conditions of film cooling injection pressure were observed. Gaseous oxygen and liquid kerosene were used as propellants, injected using a shear coaxial injector. Gaseous nitrogen as the film coolant was injected along the gap between the combustion chamber and outer injector walls. A dynamic pressure transducer and a high-speed camera with a band-pass filter were respectively used. The over-peak pressure and pressure rise time were detected in cases with film cooling. With the increase in the differential pressure, the over-peak pressure decreased, and pressure rise time increased. These phenomena are explained by the interruption of normal propellant injection in the mixing zone of propellant. The combustion instability intensity decreased with the increase in the differential pressure between the combustion chamber and injected film coolant. Flame structures were visualized to confirm the unstable combustion flame during the ignition transition. [ABSTRACT FROM AUTHOR]

Published
2023
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