10,632 research outputs found
Analyze the Robustness of Classifiers under Label Noise
This study explores the robustness of label noise classifiers, aiming to
enhance model resilience against noisy data in complex real-world scenarios.
Label noise in supervised learning, characterized by erroneous or imprecise
labels, significantly impairs model performance. This research focuses on the
increasingly pertinent issue of label noise's impact on practical applications.
Addressing the prevalent challenge of inaccurate training data labels, we
integrate adversarial machine learning (AML) and importance reweighting
techniques. Our approach involves employing convolutional neural networks (CNN)
as the foundational model, with an emphasis on parameter adjustment for
individual training samples. This strategy is designed to heighten the model's
focus on samples critically influencing performance.Comment: 21 pages, 11 figure
A Review of Smart Materials in Tactile Actuators for Information Delivery
As the largest organ in the human body, the skin provides the important
sensory channel for humans to receive external stimulations based on touch. By
the information perceived through touch, people can feel and guess the
properties of objects, like weight, temperature, textures, and motion, etc. In
fact, those properties are nerve stimuli to our brain received by different
kinds of receptors in the skin. Mechanical, electrical, and thermal stimuli can
stimulate these receptors and cause different information to be conveyed
through the nerves. Technologies for actuators to provide mechanical,
electrical or thermal stimuli have been developed. These include static or
vibrational actuation, electrostatic stimulation, focused ultrasound, and more.
Smart materials, such as piezoelectric materials, carbon nanotubes, and shape
memory alloys, play important roles in providing actuation for tactile
sensation. This paper aims to review the background biological knowledge of
human tactile sensing, to give an understanding of how we sense and interact
with the world through the sense of touch, as well as the conventional and
state-of-the-art technologies of tactile actuators for tactile feedback
delivery
Quasi-MSn identification of flavanone 7-glycoside isomers in Da Chengqi Tang by high performance liquid chromatography-tandem mass spectrometry
<p>Abstract</p> <p>Background</p> <p><it>Da Chengqi Tang </it>(DCT) is a common purgative formula in Chinese medicine. Flavanones are its major active compounds derived from <it>Fructus Aurantii Immaturus</it>. The present study developed an LC-MS/MS method to characterize two pairs of flavanone 7-glycoside isomers, i.e., hesperidin versus neohesperidin and naringin versus isonaringin.</p> <p>Methods</p> <p>After solid phase purification, components in sample were separated on a Agilent zorbax SB-C18 (5 μm, 250 mm × 4.6 mm) analytical column. ESI-MS and quasi-MS<sup>n </sup>were performed in negative ion mode to obtain structural data of these two pairs of flavanone 7-glycoside isomers. Moreover, UV absorption was measured.</p> <p>Results</p> <p>There was no intra-pairs difference in the UV-Vis and MS/MS spectra of the two pairs of 7-glycoside isomers, whereas the mass spectrometry fragmentation pathways between pairs were different.</p> <p>Conclusion</p> <p>The present study developed a LC-MS/MS method to explore the inter- and intra-pair difference of two pairs of flavanone 7-glycoside isomers.</p
On the c-k constrained KP and BKP hierarchies: the Fermionic pictures, solutions and additional symmetries
In this paper, we study two generalized constrained integrable hierarchies,
which are called the - constrained KP and BKP hierarchies. The Fermionic
picture of the - constrained KP hierarchy is given. We give some
solutions for the - constrained KP hierarchy by using the free Fermion
operators and define its additional symmetries. Its additional flows form a
subalgebra of the Virasoro algebra. Furthermore, the additional flows acting on
eigenfunctions and adjoint eigenfunctions of the -
constrained KP hierarchy are presented. Next, we define the - constrained
BKP hierarchy and obtain its bilinear identity and solutions. The algebra
formed by the additional symmetric flow of the - constrained BKP
hierarchy that we defined is still a subalgebra of the Virasoro algebra and it
is a subalgebra of the algebra formed by the additional flows of the -
constrained KP hierarchy
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