scholarly journals Quasi-coherent fluctuation measurement with the upgraded microwave imaging reflectometer in KSTAR

2018 ◽  
Vol 60 (11) ◽  
pp. 115009 ◽  
Author(s):  
W Lee ◽  
J Leem ◽  
D J Lee ◽  
M J Choi ◽  
H K Park ◽  
...  
Keyword(s):  
Microwave Imaging ◽  
Fluctuation Measurement ◽  
Coherent Fluctuation

Ion gyroscale fluctuation measurement with microwave imaging reflectometer on KSTAR

2016 ◽  
Vol 87 (11) ◽  
pp. 11E134 ◽  
Author(s):  
W. Lee ◽  
J. Leem ◽  
G. S. Yun ◽  
H. K. Park ◽  
S. H. Ko ◽  
...  
Keyword(s):  
Microwave Imaging ◽  
Fluctuation Measurement

Microwave imaging reflectometry for density fluctuation measurement on KSTAR

2014 ◽  
Vol 54 (2) ◽  
pp. 023012 ◽  
Author(s):  
W. Lee ◽  
J. Leem ◽  
J.A. Lee ◽  
Y.B. Nam ◽  
M. Kim ◽  
...  
Keyword(s):  
Density Fluctuation ◽  
Microwave Imaging ◽  
Fluctuation Measurement ◽  
Microwave Imaging Reflectometry

Fluctuation Measurement Across the Broad Range of the Low-field Side Edge Plasmas in the TST-2 Spherical Tokamak

2012 ◽  
Vol 132 (7) ◽  
pp. 499-504
Author(s):  
Masateru Sonehara ◽  
Yoshihiko Nagashima ◽  
Yuichi Takase ◽  
Akira Ejiri ◽  
Takashi Yamaguchi ◽  
...  
Keyword(s):  
Spherical Tokamak ◽  
Side Edge ◽  
Low Field ◽  
Edge Plasmas ◽  
Fluctuation Measurement

MICROWAVE IMAGING OF EMBEDDED OBJECT USING AN ENHANCED IMAGE RECONSTRUCTION ALGORITHM

2015 ◽  
Vol 74 (20) ◽  
pp. 1793-1801
Author(s):  
Sidi Mohammed Chouiti ◽  
Lotfi Merad ◽  
Sidi Mohammed Meriah ◽  
Xavier Raimundo
Keyword(s):  
Image Reconstruction ◽  
Reconstruction Algorithm ◽  
Microwave Imaging ◽  
Image Reconstruction Algorithm

A Microwave Imaging System for the Detection of Targets Hidden behind Dielectric Walls

2020 ◽  
Author(s):  
Renato Cicchetti ◽  
Valentina Cicchetti ◽  
Sandra Costanzo ◽  
Paolo D'Atanasio ◽  
Alessandro Fedeli ◽  
...  
Keyword(s):  
Imaging System ◽  
Microwave Imaging

scholarly journals Moment-to-Moment Continuous Attention Fluctuation Monitoring through Consumer-Grade EEG Device

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3419
Author(s):  
Shan Zhang ◽  
Zihan Yan ◽  
Shardul Sapkota ◽  
Shengdong Zhao ◽  
Wei Tsang Ooi
Keyword(s):  
Ground Truth ◽  
Detection Accuracy ◽  
Continuous Performance Task ◽  
Eeg Signals ◽  
Gradual Onset ◽  
Machine Learning Approach ◽  
A New Technique ◽  
Thought Probes ◽  
Labeling Method ◽  
Fluctuation Measurement

While numerous studies have explored using various sensing techniques to measure attention states, moment-to-moment attention fluctuation measurement is unavailable. To bridge this gap, we applied a novel paradigm in psychology, the gradual-onset continuous performance task (gradCPT), to collect the ground truth of attention states. GradCPT allows for the precise labeling of attention fluctuation on an 800 ms time scale. We then developed a new technique for measuring continuous attention fluctuation, based on a machine learning approach that uses the spectral properties of EEG signals as the main features. We demonstrated that, even using a consumer grade EEG device, the detection accuracy of moment-to-moment attention fluctuations was 73.49%. Next, we empirically validated our technique in a video learning scenario and found that our technique match with the classification obtained through thought probes, with an average F1 score of 0.77. Our results suggest the effectiveness of using gradCPT as a ground truth labeling method and the feasibility of using consumer-grade EEG devices for continuous attention fluctuation detection.

scholarly journals Wideband-Narrowband Switchable Tapered Slot Antenna for Breast Cancer Diagnosis and Treatment

2021 ◽  
Vol 11 (8) ◽  
pp. 3606
Author(s):  
Seonho Lim ◽  
Young Joong Yoon
Keyword(s):  
Breast Cancer ◽  
Coupling Effect ◽  
Breast Cancer Diagnosis ◽  
Microwave Imaging ◽  
Ultra Wideband ◽  
Slot Antenna ◽  
Pin Diode ◽  
Time Frequency ◽  
Switching Mode ◽  
Meander Line

In this paper, a wideband-narrowband switchable tapered slot antenna (TSA) with a compact meander line resonator for an integrated microwave imaging and hyperthermia system was proposed. A compact meander line resonator, which exhibited band-pass characteristics and provided narrowband characteristics by using one PIN diode, was fabricated beneath the tapered slot of the wideband TSA to minimize the degradation of the wideband characteristics. Moreover, the electromagnetic energy was transferred to the meander line resonator with a coupling effect to ensure effective frequency switching. By adapting a PIN diode on the meander line resonator, frequency switching could be achieved. In this way, the proposed antenna could operate in a real-time frequency switching mode between the ultra-wideband (UWB; 3.1~10 GHz), which is used for microwave imaging, and the 2.45 GHz band (industrial, scientific, and medical, ISM band), which is used for microwave hyperthermia. Frequency and time-domain results proved the applicability of the proposed antenna to an integrated breast cancer detection and treatment system.

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