5,079 research outputs found
Agent and cyber-physical system based self-organizing and self-adaptive intelligent shopfloor
The increasing demand of customized production results in huge challenges to the traditional manufacturing systems. In order to allocate resources timely according to the production requirements and to reduce disturbances, a framework for the future intelligent shopfloor is proposed in this paper. The framework consists of three primary models, namely the model of smart machine agent, the self-organizing model, and the self-adaptive model. A cyber-physical system for manufacturing shopfloor based on the multiagent technology is developed to realize the above-mentioned function models. Gray relational analysis and the hierarchy conflict resolution methods were applied to achieve the self-organizing and self-adaptive capabilities, thereby improving the reconfigurability and responsiveness of the shopfloor. A prototype system is developed, which has the adequate flexibility and robustness to configure resources and to deal with disturbances effectively. This research provides a feasible method for designing an autonomous factory with exception-handling capabilities
Routing Protocols for Underwater Acoustic Sensor Networks: A Survey from an Application Perspective
Underwater acoustic communications are different from terrestrial radio communications; acoustic channel is asymmetric and has large and variable end‐to‐end propagation delays, distance‐dependent limited bandwidth, high bit error rates, and multi‐path fading. Besides, nodes’ mobility and limited battery power also cause problems for networking protocol design. Among them, routing in underwater acoustic networks is a challenging task, and many protocols have been proposed. In this chapter, we first classify the routing protocols according to application scenarios, which are classified according to the number of sinks that an underwater acoustic sensor network (UASN) may use, namely single‐sink, multi‐sink, and no‐sink. We review some typical routing strategies proposed for these application scenarios, such as cross‐layer and reinforcement learning as well as opportunistic routing. Finally, some remaining key issues are highlighted
sTarPicker: A Method for Efficient Prediction of Bacterial sRNA Targets Based on a Two-Step Model for Hybridization
Bacterial sRNAs are a class of small regulatory RNAs involved in regulation of expression of a variety of genes. Most sRNAs act in trans via base-pairing with target mRNAs, leading to repression or activation of translation or mRNA degradation. To date, more than 1,000 sRNAs have been identified. However, direct targets have been identified for only approximately 50 of these sRNAs. Computational predictions can provide candidates for target validation, thereby increasing the speed of sRNA target identification. Although several methods have been developed, target prediction for bacterial sRNAs remains challenging.Here, we propose a novel method for sRNA target prediction, termed sTarPicker, which was based on a two-step model for hybridization between an sRNA and an mRNA target. This method first selects stable duplexes after screening all possible duplexes between the sRNA and the potential mRNA target. Next, hybridization between the sRNA and the target is extended to span the entire binding site. Finally, quantitative predictions are produced with an ensemble classifier generated using machine-learning methods. In calculations to determine the hybridization energies of seed regions and binding regions, both thermodynamic stability and site accessibility of the sRNAs and targets were considered. Comparisons with the existing methods showed that sTarPicker performed best in both performance of target prediction and accuracy of the predicted binding sites.sTarPicker can predict bacterial sRNA targets with higher efficiency and determine the exact locations of the interactions with a higher accuracy than competing programs. sTarPicker is available at http://ccb.bmi.ac.cn/starpicker/
RetouchingFFHQ: A Large-scale Dataset for Fine-grained Face Retouching Detection
The widespread use of face retouching filters on short-video platforms has
raised concerns about the authenticity of digital appearances and the impact of
deceptive advertising. To address these issues, there is a pressing need to
develop advanced face retouching techniques. However, the lack of large-scale
and fine-grained face retouching datasets has been a major obstacle to progress
in this field. In this paper, we introduce RetouchingFFHQ, a large-scale and
fine-grained face retouching dataset that contains over half a million
conditionally-retouched images. RetouchingFFHQ stands out from previous
datasets due to its large scale, high quality, fine-grainedness, and
customization. By including four typical types of face retouching operations
and different retouching levels, we extend the binary face retouching detection
into a fine-grained, multi-retouching type, and multi-retouching level
estimation problem. Additionally, we propose a Multi-granularity Attention
Module (MAM) as a plugin for CNN backbones for enhanced cross-scale
representation learning. Extensive experiments using different baselines as
well as our proposed method on RetouchingFFHQ show decent performance on face
retouching detection. With the proposed new dataset, we believe there is great
potential for future work to tackle the challenging problem of real-world
fine-grained face retouching detection.Comment: Under revie
catena-Poly[copper(II)-bis(μ-2,4-dichloro-6-formylphenolato)-κ3 O,O′:Cl 4;κ3 Cl 4:O,O′]
In the title compound, [Cu(C7H3Cl2O2)2]n, the CuII atom lies on a centre of inversion and adopts a [4+2] coordination mode, with two long axial Cu—Cl coordinative bonds complementing four Cu—O bonds from two 2,4-dichloro-6-formylphenolate ligands in a distorted square plane. π–π stacking interactions are also formed between neighbouring aromatic rings, with a centroid–centroid separation of 3.624 (2) Å
3,5-Dibromo-2-hydroxybenzaldehyde
The title compound, C7H4Br2O2, exhibits a layer packing structure via weak π–π stacking interactions [centroid–centroid distances between adjacent aromatic rings are 4.040 (8) and 3.776 (7) Å]. Molecules in each layer are linked by intermolecular O—H⋯O hydrogen bonding and Br⋯Br interactions [3.772 (4) Å]. There are two molecules in the asymmetric unit
Anisotropic shear stress effects in the basal plane of SrRuO
In this short note, we repeat the calculations the jumps for the specific
heat C, the elastic compliance S and the
thermal expansion due to a shear stress in
the basal plane of . Henceforth we clarify some issues regarding the
elastic theoretical framework suitable to explain the sound speed experiments
of Lupien et al. (2001,2002), and partially the strain experiments of Hicks et
al. (2014), and Steppke et al. (2016) in strontium ruthenate. We continue to
propose that the discontinuity in the elastic constant C of this
tetragonal crystal gives unambiguous experimental evidence that the
superconducting order parameter has two components with a broken
time-reversal symmetry state, and that the band couples the
anisotropic electron-phonon interaction to the in-plane shear stress
according to Walker and collaborators [4] and [3]. Some importants words about
the roll of the spin equal to one for the transversal phonons are added in the
conclusion following Levine [34].Comment: 11 pages, for section 5: added figure 2 and figure 3 replaced. One
reference and typos added. figure 4 added. arXiv admin note: text overlap
with arXiv:1812.0649
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