6,788 research outputs found
Online Bearing Remaining Useful Life Prediction Based on a Novel Degradation Indicator and Convolutional Neural Networks
In industrial applications, nearly half the failures of motors are caused by
the degradation of rolling element bearings (REBs). Therefore, accurately
estimating the remaining useful life (RUL) for REBs are of crucial importance
to ensure the reliability and safety of mechanical systems. To tackle this
challenge, model-based approaches are often limited by the complexity of
mathematical modeling. Conventional data-driven approaches, on the other hand,
require massive efforts to extract the degradation features and construct
health index. In this paper, a novel online data-driven framework is proposed
to exploit the adoption of deep convolutional neural networks (CNN) in
predicting the RUL of bearings. More concretely, the raw vibrations of training
bearings are first processed using the Hilbert-Huang transform (HHT) and a
novel nonlinear degradation indicator is constructed as the label for learning.
The CNN is then employed to identify the hidden pattern between the extracted
degradation indicator and the vibration of training bearings, which makes it
possible to estimate the degradation of the test bearings automatically.
Finally, testing bearings' RULs are predicted by using a -support
vector regression model. The superior performance of the proposed RUL
estimation framework, compared with the state-of-the-art approaches, is
demonstrated through the experimental results. The generality of the proposed
CNN model is also validated by transferring to bearings undergoing different
operating conditions
Spin asymmetry and dipole moments in -pair production with ultraperipheral heavy ion collisions
The anomalous magnetic (MDM) and electric (EDM) dipole moments of the
lepton serve as crucial indicators of new physics beyond the Standard Model.
Leveraging azimuthal angular asymmetry as a novel tool in ultraperipheral
collisions (UPCs), we attain unparalleled precision in the study of these key
properties. Driven by the highly linear polarization of coherent photons, this
method uniquely enables both the MDM and EDM to contribute to the
angular distribution in similar magnitudes. Importantly, our approach
substantially narrows the parameter space, excluding more than half of it
compared to expected UPC-based measurements reliant solely on the total
cross-section. This method not only provides improved constraints but also
minimizes the need for additional theoretical assumptions.Comment: 6 pages, 3 figure
Building Cooperation in VoIP Network through a Reward Mechanism
In this paper, for solving the moral hazard problem of super nodes in VOIP network and achieving better communication quality, we establish a reward mechanism based on classical efficiency-wage models. In the reward mechanism, the function of reward is to encourage super nodes to contribute their bandwidth and cover their effort costs, whereas the function of fine is to prevent opportunistic super nodes from shirking. We consider that network quality and idle bandwidth are the essential criterions for selecting qualified super nodes. Once all super nodes can satisfy specific conditions, the required reward can be derived so as to improve the VoIP platform\u27s revenue. Moreover, we also suggest several targets both in technical and economic view that the platform provider can strive in order to boost his/her market share. In addition, the case of Skype is discussed in this study and we also examine its current pricing strategy
Dynamical-Corrected Nonadiabatic Geometric Quantum Computation
Recently, nonadiabatic geometric quantum computation has been received great
attentions, due to its fast operation and intrinsic error resilience. However,
compared with the corresponding dynamical gates, the robustness of implemented
nonadiabatic geometric gates based on the conventional single-loop scheme still
has the same order of magnitude due to the requirement of strict multi-segment
geometric controls, and the inherent geometric fault-tolerance characteristic
is not fully explored. Here, we present an effective geometric scheme combined
with a general dynamical-corrected technique, with which the super-robust
nonadiabatic geometric quantum gates can be constructed over the conventional
single-loop and two-loop composite-pulse strategies, in terms of resisting the
systematic error, i.e., error. In addition, combined with the
decoherence-free subspace (DFS) coding, the resulting geometric gates can also
effectively suppress the error caused by the collective dephasing.
Notably, our protocol is a general one with simple experimental setups, which
can be potentially implemented in different quantum systems, such as Rydberg
atoms, trapped ions and superconducting qubits. These results indicate that our
scheme represents a promising way to explore large-scale fault-tolerant quantum
computation.Comment: 10 pages, 9 figure
Design and Implementation of Service-Oriented Expert System
In recent years, the Internet technologies are well developed and the Internet is filled with all kinds of information. Since the data storage is increasingly distributed and data formats are more diverged, data collection and integration for providing value- added services have gradually become important topics. In this study, we propose the Service-Oriented Expert System (SOES) based on Service Component Architecture (SCA) which can make the services on different platforms turn into a common service component on the Internet, concatenate all the service components by combining with the Enterprise Service Bus (ESB), and use both expert rules and data mining techniques to perform the data classification. The SOES is applied to analyze the annual financial information derived from electronic industry in the Taiwan Economic Journal (TEJ) during 2006 to 2008 for discovering the financial crisis enterprises. The experiment results show that using expert rules and decision tree to find the financial crisis enterprise is higher performance
Artificial Intelligent Diagnosis and Monitoring in Manufacturing
The manufacturing sector is heavily influenced by artificial
intelligence-based technologies with the extraordinary increases in
computational power and data volumes. It has been reported that 35% of US
manufacturers are currently collecting data from sensors for manufacturing
processes enhancement. Nevertheless, many are still struggling to achieve the
'Industry 4.0', which aims to achieve nearly 50% reduction in maintenance cost
and total machine downtime by proper health management. For increasing
productivity and reducing operating costs, a central challenge lies in the
detection of faults or wearing parts in machining operations. Here we propose a
data-driven, end-to-end framework for monitoring of manufacturing systems. This
framework, derived from deep learning techniques, evaluates fused sensory
measurements to detect and even predict faults and wearing conditions. This
work exploits the predictive power of deep learning to extract hidden
degradation features from noisy data. We demonstrate the proposed framework on
several representative experimental manufacturing datasets drawn from a wide
variety of applications, ranging from mechanical to electrical systems. Results
reveal that the framework performs well in all benchmark applications examined
and can be applied in diverse contexts, indicating its potential for use as a
critical corner stone in smart manufacturing
A QoS-Based Services Selected Method in Service-Oriented Architectures Using Ant Colony System - A Case Study of Airflights
Semantic web is becoming more and more popular these days, and it’s an opportune moment to look at the field’s current state and future opportunities. However, most researchers focus on only one single service recommend from semantic web inference. In some situations, the Multi-Services which are combined many complex services from various service providers are better than single service. The designed Multi-Services Semantic Search System (MS4), which provides the cooperation web-based platform for all related mobile users and service providers, could strengthen the ability of Multi-Services suggestion. In this research, MS4 chooses the adaptable airflight as a case study. MS4 is a five-components system composed of the Mobile Users (MUs), UDDI Registries (UDDIRs), Service Providers (SPs), Semantic Web Services Server (SWSS), and Database Server (DS). Using SOA, OWL-S to build semantic web environment to inference user’s requirements and search various web services which are published in UDDI through the communication networks include internet and 3G/GPRS/GSM mobile networks. In this airline case, we propose the Adaptive Airflights Inference Module (AAIM) combined QoS-Based Services Selected Method (QBSSM) using Ant Colony System (ACS) to reference the adaptable airflights to MUs
Universal critical properties of the Eulerian bond-cubic model
We investigate the Eulerian bond-cubic model on the square lattice by means
of Monte Carlo simulations, using an efficient cluster algorithm and a
finite-size scaling analysis. The critical points and four critical exponents
of the model are determined for several values of . Two of the exponents are
fractal dimensions, which are obtained numerically for the first time. Our
results are consistent with the Coulomb gas predictions for the critical O()
branch for and the results obtained by previous transfer matrix
calculations. For , we find that the thermal exponent, the magnetic
exponent and the fractal dimension of the largest critical Eulerian bond
component are different from those of the critical O(2) loop model. These
results confirm that the cubic anisotropy is marginal at but irrelevant
for
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