749 research outputs found
A Hierarchical Framework of Cloud Resource Allocation and Power Management Using Deep Reinforcement Learning
Automatic decision-making approaches, such as reinforcement learning (RL),
have been applied to (partially) solve the resource allocation problem
adaptively in the cloud computing system. However, a complete cloud resource
allocation framework exhibits high dimensions in state and action spaces, which
prohibit the usefulness of traditional RL techniques. In addition, high power
consumption has become one of the critical concerns in design and control of
cloud computing systems, which degrades system reliability and increases
cooling cost. An effective dynamic power management (DPM) policy should
minimize power consumption while maintaining performance degradation within an
acceptable level. Thus, a joint virtual machine (VM) resource allocation and
power management framework is critical to the overall cloud computing system.
Moreover, novel solution framework is necessary to address the even higher
dimensions in state and action spaces. In this paper, we propose a novel
hierarchical framework for solving the overall resource allocation and power
management problem in cloud computing systems. The proposed hierarchical
framework comprises a global tier for VM resource allocation to the servers and
a local tier for distributed power management of local servers. The emerging
deep reinforcement learning (DRL) technique, which can deal with complicated
control problems with large state space, is adopted to solve the global tier
problem. Furthermore, an autoencoder and a novel weight sharing structure are
adopted to handle the high-dimensional state space and accelerate the
convergence speed. On the other hand, the local tier of distributed server
power managements comprises an LSTM based workload predictor and a model-free
RL based power manager, operating in a distributed manner.Comment: accepted by 37th IEEE International Conference on Distributed
Computing (ICDCS 2017
Identification of morphological fingerprint in perinatal brains using quasi-conformal mapping and contrastive learning
The morphological fingerprint in the brain is capable of identifying the
uniqueness of an individual. However, whether such individual patterns are
present in perinatal brains, and which morphological attributes or cortical
regions better characterize the individual differences of ne-onates remain
unclear. In this study, we proposed a deep learning framework that projected
three-dimensional spherical meshes of three morphological features (i.e.,
cortical thickness, mean curvature, and sulcal depth) onto two-dimensional
planes through quasi-conformal mapping, and employed the ResNet18 and
contrastive learning for individual identification. We used the cross-sectional
structural MRI data of 682 infants, incorporating with data augmentation, to
train the model and fine-tuned the parameters based on 60 infants who had
longitudinal scans. The model was validated on 30 longitudinal scanned infant
data, and remarkable Top1 and Top5 accuracies of 71.37% and 84.10% were
achieved, respectively. The sensorimotor and visual cortices were recognized as
the most contributive regions in individual identification. Moreover, the
folding morphology demonstrated greater discriminative capability than the
cortical thickness, which could serve as the morphological fingerprint in
perinatal brains. These findings provided evidence for the emergence of
morphological fingerprints in the brain at the beginning of the third
trimester, which may hold promising implications for understanding the
formation of in-dividual uniqueness in the brain during early development
Regularized Shallow Image Prior for Electrical Impedance Tomography
Untrained Neural Network Prior (UNNP) based algorithms have gained increasing
popularity in tomographic imaging, as they offer superior performance compared
to hand-crafted priors and do not require training. UNNP-based methods usually
rely on deep architectures which are known for their excellent feature
extraction ability compared to shallow ones. Contrary to common UNNP-based
approaches, we propose a regularized shallow image prior method that combines
UNNP with hand-crafted prior for Electrical Impedance Tomography (EIT). Our
approach employs a 3-layer Multi-Layer Perceptron (MLP) as the UNNP in
regularizing 2D and 3D EIT inversion. We demonstrate the influence of two
typical hand-crafted regularizations when representing the conductivity
distribution with shallow MLPs. We show considerably improved EIT image quality
compared to conventional regularization algorithms, especially in structure
preservation. The results suggest that combining the shallow image prior and
the hand-crafted regularization can achieve similar performance to the Deep
Image Prior (DIP) but with less architectural dependency and complexity of the
neural network
A Continuous Dual-Axis Atomic Interferometric Inertial Sensor
We present an interferometric inertial sensor that utilizes two
counter-propagating atomic beams with transverse two-dimensional cooling. By
employing three parallel and spatially aligned Raman laser beams for
Doppler-sensitive Raman transitions, we successfully generate inertia-sensitive
Mach-Zehnder interference fringes with an interrogation length of
. The measured rotation and acceleration sensitivities are
and ,
respectively. The sensor's capability to measure rotation and acceleration
simultaneously in dynamic environments is validated through comparative
analysis with classical sensors under force oscillation in different
directions. Additionally, we conduct experiments on a turntable to calibrate
the gyroscope's scaling factor and address nonlinearity.Comment: 8 pages, 4 figure
Hilbert Distillation for Cross-Dimensionality Networks
3D convolutional neural networks have revealed superior performance in
processing volumetric data such as video and medical imaging. However, the
competitive performance by leveraging 3D networks results in huge computational
costs, which are far beyond that of 2D networks. In this paper, we propose a
novel Hilbert curve-based cross-dimensionality distillation approach that
facilitates the knowledge of 3D networks to improve the performance of 2D
networks. The proposed Hilbert Distillation (HD) method preserves the
structural information via the Hilbert curve, which maps high-dimensional (>=2)
representations to one-dimensional continuous space-filling curves. Since the
distilled 2D networks are supervised by the curves converted from dimensionally
heterogeneous 3D features, the 2D networks are given an informative view in
terms of learning structural information embedded in well-trained
high-dimensional representations. We further propose a Variable-length Hilbert
Distillation (VHD) method to dynamically shorten the walking stride of the
Hilbert curve in activation feature areas and lengthen the stride in context
feature areas, forcing the 2D networks to pay more attention to learning from
activation features. The proposed algorithm outperforms the current
state-of-the-art distillation techniques adapted to cross-dimensionality
distillation on two classification tasks. Moreover, the distilled 2D networks
by the proposed method achieve competitive performance with the original 3D
networks, indicating the lightweight distilled 2D networks could potentially be
the substitution of cumbersome 3D networks in the real-world scenario.Comment: Accepted at NeurIPS 202
Process of Forensic Medicine in DNA Identification of Aged Human Remains
Skeleton and teeth are important biological samples. Due to their special structure and strong ability to resist degradation, they are ideal biological materials to retain DNA under natural condition. In many cases, such as historical figure identification, aged skeleton and teeth are usually the only biological samples. However, their DNA is in a state of trace, damage and degradation to different degrees, which requires special experimental treatment to achieve identification. This paper reviews the sample selection, DNA extraction, DNA enrichment and analysis approaches based on relevant research reports in recent years, aiming to promote the further development and improvement of the aged skeleton and teeth identification system
Production of and in decays as and molecules
The molecular nature of and have been
extensively studied from the perspective of their masses, decay properties, and
production rates. In this work, we study the weak decays of and by
invoking triangle diagrams where the meson first decays weakly into
and (), and then the
and are dynamically generated by the
final-state interactions of and via
exchanges of and mesons. The obtained absolute branching
fractions of Br are in reasonable
agreement with the experimental data, while the branching fractions of Br are smaller than the experimental central
values by almost a factor of two to three. We tentatively attribute such a
discrepancy to either reaction mechanisms missing in the present work or the
likely existence of a relatively larger component in the
wave function.Comment: 17 pages, 4 figure
- β¦