154 research outputs found
Structured Memetic Automation for Online Human-like Social Behavior Learning
Meme automaton is an adaptive entity that autonomously acquires an increasing level of capability and intelligence through embedded memes evolving independently or via social interactions. This paper begins a study on memetic multiagent system (MeMAS) toward human-like social agents with memetic automaton. We introduce a potentially rich meme-inspired design and operational model, with Darwin's theory of natural selection and Dawkins' notion of a meme as the principal driving forces behind interactions among agents, whereby memes form the fundamental building blocks of the agents' mind universe. To improve the efficiency and scalability of MeMAS, we propose memetic agents with structured memes in this paper. Particularly, we focus on meme selection design where the commonly used elitist strategy is further improved by assimilating the notion of like-attracts-like in the human learning. We conduct experimental study on multiple problem domains and show the performance of the proposed MeMAS on human-like social behavior
Cryogenic hybrid magnonic circuits based on spalled YIG thin films
Yttrium iron garnet (YIG) magnonics has sparked extensive research interests
toward harnessing magnons (quasiparticles of collective spin excitation) for
signal processing. In particular, YIG magnonics-based hybrid systems exhibit
great potentials for quantum information science because of their wide
frequency tunability and excellent compatibility with other platforms. However,
the broad application and scalability of thin-film YIG devices in the quantum
regime has been severely limited due to the substantial microwave loss in the
host substrate for YIG, gadolinium gallium garnet (GGG), at cryogenic
temperatures. In this study, we demonstrate that substrate-free YIG thin films
can be obtained by introducing the controlled spalling and layer transfer
technology to YIG/GGG samples. Our approach is validated by measuring a hybrid
device consisting of a superconducting resonator and a spalled YIG film, which
gives a strong coupling feature indicating the good coherence of our system.
This advancement paves the way for enhanced on-chip integration and the
scalability of YIG-based quantum devices.Comment: 10 pages, 8 figure
Novel Parameterized Utility Function on Dual Hesitant Fuzzy Rough Sets and Its Application in Pattern Recognition
Based on comparative studies on correlation coefficient theory and utility theory, a series of rules that utility functions on dual hesitant fuzzy rough sets (DHFRSs) should satisfy, and a kind of novel utility function on DHFRSs are proposed. The characteristic of the introduced utility function is a parameter, which is determined by decision-makers according to their experiences. By using the proposed utility function on DHFRSs, a novel dual hesitant fuzzy rough pattern recognition method is also proposed. Furthermore, this study also points out that the classical dual tool is suitable to cope with dynamic data in exploratory data analysis situations, while the newly proposed one is suitable to cope with static data in confirmatory data analysis situations. Finally, a medical diagnosis and a traffic engineering example are introduced to reveal the effectiveness of the newly proposed utility functions on DHFRSs.
Document type: Articl
Resonant magneto-optic Kerr effect in the magnetic topological insulator Cr:(Sb,Bi)Te
We report measurements of the polar Kerr effect, proportional to the
out-of-plane component of the magnetization, in thin films of the magnetically
doped topological insulator
. Measurements
of the complex Kerr angle, , were performed as a function of photon
energy in the range . We observed a
peak in the real part of and zero crossing in the imaginary
part that we attribute to resonant interaction with a spin-orbit avoided
crossing located 1.6 eV above the Fermi energy. The resonant
enhancement allows measurement of the temperature and magnetic field dependence
of in the ultrathin film limit, quintuple layers. We find a
sharp transition to zero remanent magnetization at 6 K for ~QL, consistent
with theories of the dependence of impurity spin interactions on film thickness
and their location relative to topological insulator surfaces.Comment: 6 pages, 5 figure
Metal-to-Insulator Switching in Quantum Anomalous Hall States
After decades of searching for the dissipationless transport in the absence
of any external magnetic field, quantum anomalous Hall effect (QAHE) was
recently achieved in magnetic topological insulator (TI) films. However, the
universal phase diagram of QAHE and its relation with quantum Hall effect (QHE)
remain to be investigated. Here, we report the experimental observation of the
giant longitudinal resistance peak and zero Hall conductance plateau at the
coercive field in the 6 quintuple-layer (Cr0.12Bi0.26Sb0.62)2Te3 film, and
demonstrate the metal-to-insulator switching between two opposite QAHE plateau
states up to 0.3 K. Moreover, the universal QAHE phase diagram is realized
through the angle-dependent measurements. Our results address that the quantum
phase transitions in both QAHE and QHE regimes are in the same universality
class, yet the microscopic details are different. In addition, the realization
of the QAHE insulating state unveils new ways to explore quantum phase-related
physics and applications
Hemp seeds attenuate loperamide-induced constipation in mice
Constipation is a common gastrointestinal disease that seriously affects human physical and mental health. Studies have reported that hemp seeds can improve constipation, however the specific mechanism is still unclear. This study investigates that hemp seed (HS) and its water-ethanol extract (HSE) attenuates loperamide-induced constipation in mice. The research results show that: the fecal water content and small intestinal transit rate of mice in the hemp seed group and hemp seed hydroalcoholic extract group were significantly increased compared with MC group, and the first red feces defecation time was significantly shortened; HS and HSE significantly influence serum levels of Gastrin (Gas), motilin (MTL), substance P (SP), and endothelin (ET), potentially mediating their effects on gastrointestinal motility. HS and HSE can improve colon inflammation in constipated mice with H&E staining. Compared with the model of constipation group, the content of short-chain fatty acids in the HS group and HSE group increased significantly. Gut microbiome studies have shown that the structure and abundance of intestinal flora are altered. HS and HSE changed the abundance of Odoribacter, Bacteroide, Lactobacillus and Prevotella. Together, these results suggest that HS have the potential to stimulate the proliferation of beneficial gut microbes and promote intestinal motility, thereby improving gut health and relieving symptoms of constipation
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