3,061 research outputs found
Noise in Genotype Selection Model
We study the steady state properties of a genotype selection model in
presence of correlated Gaussian white noise. The effect of the noise on the
genotype selection model is discussed. It is found that correlated noise can
break the balance of gene selection and induce the phase transition which can
makes us select one type gene haploid from a gene group.Comment: 8 pages, 4 figure
Current Reversals in a inhomogeneous system with asymmetric unbiased fluctuations
We present a study of transport of a Brownian particle moving in periodic
symmetric potential in the presence of asymmetric unbiased fluctuations. The
particle is considered to move in a medium with periodic space dependent
friction. By tuning the parameters of the system, the direction of current
exhibit reversals, both as a function of temperature as well as the amplitude
of rocking force. We found that the mutual interplay between the opposite
driving factors is the necessary term for current reversals.Comment: 9 pages, 7 figure
SLLEN: Semantic-aware Low-light Image Enhancement Network
How to effectively explore semantic feature is vital for low-light image
enhancement (LLE). Existing methods usually utilize the semantic feature that
is only drawn from the semantic map produced by high-level semantic
segmentation network (SSN). However, if the semantic map is not accurately
estimated, it would affect the high-level semantic feature (HSF) extraction,
which accordingly interferes with LLE. In this paper, we develop a simple yet
effective two-branch semantic-aware LLE network (SLLEN) that neatly integrates
the random intermediate embedding feature (IEF) (i.e., the information
extracted from the intermediate layer of semantic segmentation network)
together with the HSF into a unified framework for better LLE. Specifically,
for one branch, we utilize an attention mechanism to integrate HSF into
low-level feature. For the other branch, we extract IEF to guide the adjustment
of low-level feature using nonlinear transformation manner. Finally,
semantic-aware features obtained from two branches are fused and decoded for
image enhancement. It is worth mentioning that IEF has some randomness compared
to HSF despite their similarity on semantic characteristics, thus its
introduction can allow network to learn more possibilities by leveraging the
latent relationships between the low-level feature and semantic feature, just
like the famous saying "God rolls the dice" in Physics Nobel Prize 2022.
Comparisons between the proposed SLLEN and other state-of-the-art techniques
demonstrate the superiority of SLLEN with respect to LLE quality over all the
comparable alternatives
Pie-like electrode design for high-energy density lithium–sulfur batteries
Owing to the overwhelming advantage in energy density, lithium–sulfur (Li–S) battery is a promising next-generation electrochemical energy storage system. Despite many efforts in pursuing long cycle life, relatively little emphasis has been placed on increasing the areal energy density. Herein, we have designed and developed a ‘pie’ structured electrode, which provides an excellent balance between gravimetric and areal energy densities. Combining lotus root-like multichannel carbon nanofibers ‘filling’ and amino-functionalized graphene ‘crust’, the free-standing paper electrode (S mass loading: 3.6 mg cm[superscript −2]) delivers high specific capacity of 1,314 mAh g[superscript −1] (4.7 mAh cm[superscript −2]) at 0.1 C (0.6 mA cm[superscript −2]) accompanied with good cycling stability. Moreover, the areal capacity can be further boosted to more than 8 mAh cm[superscript −2] by stacking three layers of paper electrodes with S mass loading of 10.8 mg cm[superscript −2].National Science Foundation (U.S.) (DMR-1120901)Wuxi Weifu High-technology Group Co., Ltd
DAA: A Delta Age AdaIN operation for age estimation via binary code transformer
Naked eye recognition of age is usually based on comparison with the age of
others. However, this idea is ignored by computer tasks because it is difficult
to obtain representative contrast images of each age. Inspired by the transfer
learning, we designed the Delta Age AdaIN (DAA) operation to obtain the feature
difference with each age, which obtains the style map of each age through the
learned values representing the mean and standard deviation. We let the input
of transfer learning as the binary code of age natural number to obtain
continuous age feature information. The learned two groups of values in Binary
code mapping are corresponding to the mean and standard deviation of the
comparison ages. In summary, our method consists of four parts: FaceEncoder,
DAA operation, Binary code mapping, and AgeDecoder modules. After getting the
delta age via AgeDecoder, we take the average value of all comparison ages and
delta ages as the predicted age. Compared with state-of-the-art methods, our
method achieves better performance with fewer parameters on multiple facial age
datasets.Comment: Accepted by CVPR2023; 8 pages, 3 figure
Three-phase optimal power flow for networked microgrids based on semidefinite programming convex relaxation
Many autonomous microgrids have extensive penetration of distributed generation (DG). Optimal power flow (OPF) is necessary for the optimal dispatch of networked microgrids (NMGs). Existing convex relaxation methods for three-phase OPF are limited to radial networks. In light of this, we develop a semidefinite programming (SDP) convex relaxation model which can cope with meshed networks and also includes a model of three-phase DG and under-load voltage regulators with different connection types. The SDP model solves the OPF problem of multi-phase meshed network effectively, with satisfactory accuracy, as validated by real 6-bus, 9-bus, and 30-bus NMGs, and the IEEE 123-bus test cases. In the SDP model, the convex symmetric component of the three-phase DG model is demonstrated to be more accurate than a three-phase DG modelled as three single-phase DG units in three-phase unbalanced OPF. The proposed method also has higher accuracy than the existing convex relaxation methods. The resultant optimal control variables obtained from the convex relaxation optimization can be used for both final optimal dispatch strategy and initial value of the non-convex OPF to obtain the globally optimal solution efficiently
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