354 research outputs found
Automated eye disease classification method from anterior eye image using anatomical structure focused image classification technique
This paper presents an automated classification method of infective and
non-infective diseases from anterior eye images. Treatments for cases of
infective and non-infective diseases are different. Distinguishing them from
anterior eye images is important to decide a treatment plan. Ophthalmologists
distinguish them empirically. Quantitative classification of them based on
computer assistance is necessary. We propose an automated classification method
of anterior eye images into cases of infective or non-infective disease.
Anterior eye images have large variations of the eye position and brightness of
illumination. This makes the classification difficult. If we focus on the
cornea, positions of opacified areas in the corneas are different between cases
of the infective and non-infective diseases. Therefore, we solve the anterior
eye image classification task by using an object detection approach targeting
the cornea. This approach can be said as "anatomical structure focused image
classification". We use the YOLOv3 object detection method to detect corneas of
infective disease and corneas of non-infective disease. The detection result is
used to define a classification result of a image. In our experiments using
anterior eye images, 88.3% of images were correctly classified by the proposed
method.Comment: Accepted paper as a poster presentation at SPIE Medical Imaging 2020,
Houston, TX, US
CHARACTERISTICS OF THROWING MOTION OF OVERPOWERING FASTBALL COLLEGE PITCHERS
The purpose of this study was to compare the motion pattern of overpowering fastball pitchers. The throwing motion of eighteen male college pitchers were analysed using a motion capture system. This study focused on the movements of the pivot leg and the trunk during the preparatory phase. The overpowering fastball pitchers in the present study largely abducted the hip of the pivot leg and leaned the trunk toward the pivot leg during the preparatory phase. That these motions were seen during the preparatory phase would reveal that a key motion to get fast ball speed exist in the preparatory phase
Non-invertible symmetries and boundaries in four dimensions
We study quantum field theories with boundary by utilizing non-invertible
symmetries. We consider three kinds of boundary conditions of the four
dimensional lattice gauge theory at the critical point as
examples. The weights of the elements on the boundary is determined so that
these boundary conditions are related by the Kramers-Wannier-Wegner (KWW)
duality. In other words, it is required that the KWW duality defects ending on
the boundary is topological. Moreover, we obtain the ratios of the hemisphere
partition functions with these boundary conditions; this result constrains the
boundary renormalization group flows under the assumption of the conjectured
g-theorem in four dimensions.Comment: 17 pages, 19 figure
PERFORMANCE ANALYSIS OF THE START PHASE OF SKELETON ATHLETES AT INTERNATIONAL COMPETITIONS
The purpose of this study was to investigate characteristics of the skeleton start motion from the viewpoint of step frequency and step length. Twenty-six male and twenty female skeleton athletes at international competitions were videotaped and analysed their start motion with the three-dimensional DLT method. There were high significant correlations between the start time and the goal time in both men (r = 0.947, p \u3c 0.001) and women (r = 0.741, p \u3c 0.001). As for the start time, men showed a significant correlation with the step length at the 1st step (r = -0.606, p \u3c 0.01) while women showed significant correlations with the step frequency at the 1st (r = -0.475, p \u3c 0.05), 3rd (r = -0.497, p \u3c 0.05) and 5th (r = -0.471, p \u3c 0.05) step. These result indicated that men emphasized step length at the 1st step, while women relied more on step frequency
BRAKING FORCES DURING BICYCLE PEDALING: AN EXAMINATION OF THE FULL CRANK ROTATION
Pedalling skills are evaluated using angular impluse of negative crank torque (INCT) that occurs in pulling phase (180-360° of crank rotation that 0° is top dead center. INCT has the effect of inhibit crank rotation (âbraking forceâ). The aim of study was to obtain findings to reduce INCT for improving cyclists\u27 pedalling skills. We examined the relationship between INCT and kinetic pedalling data through the full crank rotation. Fifteen male cyclists performed constant pedalling at 80%Vo2max and 90rpm. Kinetic and kinematic pedalling data were measured by the pedal-shaped force platform (KISTLER) and by a 3D motion capture system (VICON). A negative correlation was indicated 80-250° of crank rotation between horizontal pedal force (Fh) and INCT (pNCT occurring in pulling phase was affected by amount of Fh in pushing phase
Rechargeable MetalâAir ProtonâExchange Membrane Batteries for Renewable Energy Storage
Rechargeable protonâexchange membrane batteries that employ organic chemical hydrides as hydrogenâstorage media have the potential to serve as nextâgeneration power sources; however, significant challenges remain regarding the improvement of the reversible hydrogenâstorage capacity. Here, we address this challenge through the use of metalâion redox couples as energy carriers for battery operation. Carbon, with a suitable degree of crystallinity and surface oxygenation, was used as an effective anode material for the metal redox reactions. A Sn0.9In0.1P2O7âbased electrolyte membrane allowed no crossover of vanadium ions through the membrane. The V4+/V3+, V3+/V2+, and Sn4+/Sn2+ redox reactions took place at a more positive potential than that for hydrogen reduction, so that undesired hydrogen production could be avoided. The resulting electrical capacity reached 306 and 258â
mAhâgâ1 for VOSO4 and SnSO4, respectively, and remained at 76 and 91â% of their respective initial values after 50 cycles.Positive exchange: A protonâexchange membrane fuel cell is integrated with active anode materials including vanadium and tin ions, for which redox reactions occur at more positive potentials than for hydrogen reduction. These redox couples are demonstrated to function as promising energyâstorage media with excellent reversibility and good cyclability.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/137429/1/celc201500473-sup-0001-misc_information.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/137429/2/celc201500473.pd
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