353 research outputs found
Ranking-based Deep Cross-modal Hashing
Cross-modal hashing has been receiving increasing interests for its low
storage cost and fast query speed in multi-modal data retrievals. However, most
existing hashing methods are based on hand-crafted or raw level features of
objects, which may not be optimally compatible with the coding process.
Besides, these hashing methods are mainly designed to handle simple pairwise
similarity. The complex multilevel ranking semantic structure of instances
associated with multiple labels has not been well explored yet. In this paper,
we propose a ranking-based deep cross-modal hashing approach (RDCMH). RDCMH
firstly uses the feature and label information of data to derive a
semi-supervised semantic ranking list. Next, to expand the semantic
representation power of hand-crafted features, RDCMH integrates the semantic
ranking information into deep cross-modal hashing and jointly optimizes the
compatible parameters of deep feature representations and of hashing functions.
Experiments on real multi-modal datasets show that RDCMH outperforms other
competitive baselines and achieves the state-of-the-art performance in
cross-modal retrieval applications
A Quantum Probability Driven Framework for Joint Multi-Modal Sarcasm, Sentiment and Emotion Analysis
Sarcasm, sentiment, and emotion are three typical kinds of spontaneous
affective responses of humans to external events and they are tightly
intertwined with each other. Such events may be expressed in multiple
modalities (e.g., linguistic, visual and acoustic), e.g., multi-modal
conversations. Joint analysis of humans' multi-modal sarcasm, sentiment, and
emotion is an important yet challenging topic, as it is a complex cognitive
process involving both cross-modality interaction and cross-affection
correlation. From the probability theory perspective, cross-affection
correlation also means that the judgments on sarcasm, sentiment, and emotion
are incompatible. However, this exposed phenomenon cannot be sufficiently
modelled by classical probability theory due to its assumption of
compatibility. Neither do the existing approaches take it into consideration.
In view of the recent success of quantum probability (QP) in modeling human
cognition, particularly contextual incompatible decision making, we take the
first step towards introducing QP into joint multi-modal sarcasm, sentiment,
and emotion analysis. Specifically, we propose a QUantum probabIlity driven
multi-modal sarcasm, sEntiment and emoTion analysis framework, termed QUIET.
Extensive experiments on two datasets and the results show that the
effectiveness and advantages of QUIET in comparison with a wide range of the
state-of-the-art baselines. We also show the great potential of QP in
multi-affect analysis
Physics-informed machine learning for solving partial differential equations in porous media
Physical phenomenon in nature is generally simulated by partial differential equations. Among different sorts of partial differential equations, the problem of two-phase flow in porous media has been paid intense attention. As a promising direction, physics-informed neural networks shed new light on the solution of partial differential equations. However, current physics-informed neural networks’ ability to learn partial differential equations relies on adding artificial diffusion or using prior knowledge to increase the number of training points along the shock trajectory, or adaptive activation functions. To address these issues, this study proposes a physics-informed neural network with long short-term memory and attention mechanism, an ingenious method to solve the Buckley-Leverett partial differential equations representing two-phase flow in porous media. The designed network structure overcomes the dependency on artificial diffusion terms and enhances the importance of shallow features. The experimental results show that the proposed method is in good agreement with analytical solutions. Accurate approximations are shown even when encountering shock points in saturated fields of porous media. Furthermore, experiments show our innovative method outperforms existing traditional physics-informed machine learning approaches.Cited as: Shan, L., Liu, C., Liu, Y., Tu, Y., Dong, L., Hei, X. Physics-informed machine learning for solving partial differential equations in porous media. Advances in Geo-Energy Research, 2023, 8(1): 37-44. https://doi.org/10.46690/ager.2023.04.0
An mechatronics coupling design approach for aerostatic bearing spindles
In this paper, a new design approach for aerostatic bearing spindles (ABS) is firstly proposed which takes into account of the interactions between the mechanical and the servo subsystems, including the integration of electromagnetic effects, static pressure characteristics, servo control and mechanical characteristics. According to the air bearing design principle, the geometry of the spindle rotor is designed. The fluid software is used to analyze the influence of the bearing capacity and stiffness on the stability of the spindle. The simulation shows when the air film thickness is 12 μm, the bearing has good load carrying capacity and rigidity. In addition, the influence of motor harmonics on the spindle shaft modes is considered to avoid the resonance of ABS, and to ensure ABS anti-interference capability, proper inertia of ABS is calculated and analyzed. Finally, ABS has a good follow-up effect on the servo control and machining performance through the experimental prototype. The electromechanical coupling design approach for ABS proposed in this paper, can achieve a peak value better than 0.8 μm (surface size: 9 mm × 9 mm) and a surface roughness better than 8 nm in end face turning experiments
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