285 research outputs found
Physical implementation of holonomic quantum computation in decoherence-free subspaces with trapped ions
We propose a feasible scheme to achieve holonomic quantum computation in a
decoherence-free subspace (DFS) with trapped ions. By the application of
appropriate bichromatic laser fields on the designated ions, we are able to
construct two noncommutable single-qubit gates and one controlled-phase gate
using the holonomic scenario in the encoded DFS.Comment: 4 pages, 3 figures. To appear in Phys. Rev. A 74 (2006
A Deep Reinforcement Learning Approach for Finding Non-Exploitable Strategies in Two-Player Atari Games
This paper proposes novel, end-to-end deep reinforcement learning algorithms
for learning two-player zero-sum Markov games. Our objective is to find the
Nash Equilibrium policies, which are free from exploitation by adversarial
opponents. Distinct from prior efforts on finding Nash equilibria in
extensive-form games such as Poker, which feature tree-structured transition
dynamics and discrete state space, this paper focuses on Markov games with
general transition dynamics and continuous state space. We propose (1) Nash DQN
algorithm, which integrates DQN with a Nash finding subroutine for the joint
value functions; and (2) Nash DQN Exploiter algorithm, which additionally
adopts an exploiter for guiding agent's exploration. Our algorithms are the
practical variants of theoretical algorithms which are guaranteed to converge
to Nash equilibria in the basic tabular setting. Experimental evaluation on
both tabular examples and two-player Atari games demonstrates the robustness of
the proposed algorithms against adversarial opponents, as well as their
advantageous performance over existing methods
Effects of an air curtain on the temperature distribution in refrigerated vehicles under a hot climate condition
Generalized Category Discovery with Decoupled Prototypical Network
Generalized Category Discovery (GCD) aims to recognize both known and novel
categories from a set of unlabeled data, based on another dataset labeled with
only known categories. Without considering differences between known and novel
categories, current methods learn about them in a coupled manner, which can
hurt model's generalization and discriminative ability. Furthermore, the
coupled training approach prevents these models transferring category-specific
knowledge explicitly from labeled data to unlabeled data, which can lose
high-level semantic information and impair model performance. To mitigate above
limitations, we present a novel model called Decoupled Prototypical Network
(DPN). By formulating a bipartite matching problem for category prototypes, DPN
can not only decouple known and novel categories to achieve different training
targets effectively, but also align known categories in labeled and unlabeled
data to transfer category-specific knowledge explicitly and capture high-level
semantics. Furthermore, DPN can learn more discriminative features for both
known and novel categories through our proposed Semantic-aware Prototypical
Learning (SPL). Besides capturing meaningful semantic information, SPL can also
alleviate the noise of hard pseudo labels through semantic-weighted soft
assignment. Extensive experiments show that DPN outperforms state-of-the-art
models by a large margin on all evaluation metrics across multiple benchmark
datasets. Code and data are available at https://github.com/Lackel/DPN.Comment: Accepted by AAAI 202
An interferon regulatory factor-like binding element restricts Xmyf-5 expression in the posterior somites during Xenopus myogenesis
AbstractThe expression of myf-5, a key component of myogenic regulatory genes, declines progressively in mature somitic cells during vertebrate myogenesis. Little is known about how this down-regulation takes place. Here we provide evidence that an interferon regulatory factor binding element (IRF element) within the Xenopus myf-5 promoter is responsible for the elimination of myf-5 transcription in mature somitic mesoderm of Xenopus embryos. We show that this IRF element mediates the down-regulation of Xmyf-5 transcription in gastrula embryos, and can specifically interact with nuclear proteins of early neurula. Moreover, deletion of this IRF element results in the anterior expansion of reporter gene transcripts within somitic mesoderm in transgenic embryos. Our results, therefore, provide insight into how the negative control of Xmyf-5 expression takes place
Towards Self-Interpretable Graph-Level Anomaly Detection
Graph-level anomaly detection (GLAD) aims to identify graphs that exhibit
notable dissimilarity compared to the majority in a collection. However,
current works primarily focus on evaluating graph-level abnormality while
failing to provide meaningful explanations for the predictions, which largely
limits their reliability and application scope. In this paper, we investigate a
new challenging problem, explainable GLAD, where the learning objective is to
predict the abnormality of each graph sample with corresponding explanations,
i.e., the vital subgraph that leads to the predictions. To address this
challenging problem, we propose a Self-Interpretable Graph aNomaly dETection
model (SIGNET for short) that detects anomalous graphs as well as generates
informative explanations simultaneously. Specifically, we first introduce the
multi-view subgraph information bottleneck (MSIB) framework, serving as the
design basis of our self-interpretable GLAD approach. This way SIGNET is able
to not only measure the abnormality of each graph based on cross-view mutual
information but also provide informative graph rationales by extracting
bottleneck subgraphs from the input graph and its dual hypergraph in a
self-supervised way. Extensive experiments on 16 datasets demonstrate the
anomaly detection capability and self-interpretability of SIGNET.Comment: 23 pages; accepted to NeurIPS 202
Polysaccharide assisted microencapsulation for volatile phase change materials with a fluorescent retention indicator
Investigation of thermal management for lithium-ion pouch battery module based on phase change slurry and mini channel cooling plate
In this paper, the thermal management based on phase change slurry (PCS) and mini channel cooling plate for the lithium-ion pouch battery module was proposed. The three-dimensional thermal model was established and the optimum structure of the cooling plate with mini channel was designed with the orthogonal matrix experimental method to balance the cooling performance and energy consumption. The simulation results showed that the cooling performance of PCS consisting of 20% n-octadecane microcapsules and 80% water was better than that of pure water, glycol solution and mineral oil, when the mass flow rate was less than 3 x 10(-4) kg s(-1). For different concentrations of PCS, if the mass flow rate exceeded the critical value, its cooling performance was worse than that of pure water. When the cooling target for battery maximum temperature was higher than 309 K, the PCS cooling with appropriate microcapsule concentration had the edge over in energy consumption compared with water cooling. At last, the dimensionless empirical formula was obtained to predict the effect of the PCS's physical parameters and flow characteristics on the heat transfer and cooling performance. The simulation results will be useful for the design of PCS based battery thermal management systems. (C) 2018 Elsevier Ltd. All rights reserved
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