142 research outputs found
Bi-directional Ontology Versioning BOV
his paper defines a new type of ontology versioning: Bi-directional Ontology Versioning: BOV. BOV provides bi-directional mappings and transformations between concepts in two ontology versions. BOV is identified by two levels mapping processes: linguistic mapping and structural mapping. BOV can satisfy the requirement of mapping in distributed environment
A robust modulation classification method using convolutional neural networks
Automatic modulation classification (AMC) is a core technique in noncooperative communication systems. In particular, feature-based (FB) AMC algorithms have been widely studied. Current FB AMC methods are commonly designed for a limited set of modulation and lack of generalization ability; to tackle this challenge, a robust AMC method using convolutional neural networks (CNN) is proposed in this paper. In total, 15 different modulation types are considered. The proposed method can classify the received signal directly without feature extracion, and it can automatically learn features from the received signals. The features learned by the CNN are presented and analyzed. The robust features of the received signals in a specific SNR range are studied. The accuracy of classification using CNN is shown to be remarkable, particularly for low SNRs. The generalization ability of robust features is also proven to be excellent using the support vector machine (SVM). Finally, to help us better understand the process of feature learning, some outputs of intermediate layers of the CNN are visualized
Automatic Truss Design with Reinforcement Learning
Truss layout design, namely finding a lightweight truss layout satisfying all
the physical constraints, is a fundamental problem in the building industry.
Generating the optimal layout is a challenging combinatorial optimization
problem, which can be extremely expensive to solve by exhaustive search.
Directly applying end-to-end reinforcement learning (RL) methods to truss
layout design is infeasible either, since only a tiny portion of the entire
layout space is valid under the physical constraints, leading to particularly
sparse rewards for RL training. In this paper, we develop AutoTruss, a
two-stage framework to efficiently generate both lightweight and valid truss
layouts. AutoTruss first adopts Monte Carlo tree search to discover a diverse
collection of valid layouts. Then RL is applied to iteratively refine the valid
solutions. We conduct experiments and ablation studies in popular truss layout
design test cases in both 2D and 3D settings. AutoTruss outperforms the
best-reported layouts by 25.1% in the most challenging 3D test cases, resulting
in the first effective deep-RL-based approach in the truss layout design
literature.Comment: IJCAI2023. The codes are available at
https://github.com/StigLidu/AutoTrus
Current Situation and Development Trend of Mobile Communication Systems
This paper introduces the development background of mobile communication and the development of mobilecommunication. It introduces the application principle, network structure, main technology, the advantages anddisadvantages of the three generations of mobile communication system respectively, and introduces the currentthird generation mobile communication system, including its technical support and research direction, analysis andcomparison of the European WCDMA system, the United States CDMA2000 system and China's TD-SCDMA systemtechnical characteristics. Finally, the development trend and prospect of future mobile communication system arediscussed
Coding the negative emotions of family members and patients among the high-risk preoperative conversations with the Chinese version of VR-CoDES
Abstract Background Little is known about family members' and patients' expression of negative emotions among high‐risk preoperative conversations. Objectives This study aimed to identify the occurrence and patterns of the negative emotions of family members and patients in preoperative conversations, to investigate the conversation themes and to explore the correlation between the negative emotions and the conversation themes. Methods A retrospective study was conducted using the Chinese version of Verona Coding Definitions of Emotional Sequences (VR‐CoDES‐C) to code 297 conversations on high‐risk procedures. Inductive content analysis was used to analyse the topics in which negative emotions nested. The χ2 Test was used to test the association between the cues and the conversation themes. Results The occurrence rate of family members' and patients' negative emotions was very high (85.9%), much higher when compared to most conversations under other medical settings. The negative emotions were mainly expressed by cues (96.4%), and cue‐b (67.4%) was the most frequent category. Cues and concerns were mostly elicited by family members and patients (71.6%). Negative emotions were observed among seven themes, in which ‘Psychological stress relating to illness severity, family's care and financial burden’ (30.3%) ranked the top. Cue‐b, cue‐c and cue‐d had a significant correlation (p < .001) with certain themes. Conclusions Family members and patients conveyed significantly more negative emotions in the high‐risk preoperative conversations than in other medical communications. Certain categories of cues were induced by specific emotional conversation contents. Patient Contribution Family members and patients contributed to data
Boosting Few-Shot Text Classification via Distribution Estimation
Distribution estimation has been demonstrated as one of the most effective
approaches in dealing with few-shot image classification, as the low-level
patterns and underlying representations can be easily transferred across
different tasks in computer vision domain. However, directly applying this
approach to few-shot text classification is challenging, since leveraging the
statistics of known classes with sufficient samples to calibrate the
distributions of novel classes may cause negative effects due to serious
category difference in text domain. To alleviate this issue, we propose two
simple yet effective strategies to estimate the distributions of the novel
classes by utilizing unlabeled query samples, thus avoiding the potential
negative transfer issue. Specifically, we first assume a class or sample
follows the Gaussian distribution, and use the original support set and the
nearest few query samples to estimate the corresponding mean and covariance.
Then, we augment the labeled samples by sampling from the estimated
distribution, which can provide sufficient supervision for training the
classification model. Extensive experiments on eight few-shot text
classification datasets show that the proposed method outperforms
state-of-the-art baselines significantly.Comment: Accepted to AAAI 202
Tunable topological phase transition in soft Rayleigh beam system with imperfect interfaces
Acoustic metamaterials, particularly the topological insulators, exhibit
exceptional wave characteristics that have sparked considerable research
interest. The study of imperfect interfaces affect is of significant importance
for the modeling of wave propagation behavior in topological insulators. This
paper models a soft Rayleigh beam system with imperfect interfaces, and
investigates its topological phase transition process tuned by mechanical
loadings. The model reveals that the topological phase transition process can
be observed by modifying the distance between imperfect interfaces in the
system. When a uniaxial stretch is applied, the topological phase transition
points for longitudinal waves decrease within a limited frequency range, while
they increase within a larger frequency scope for transverse waves. Enhancing
the rigidity of the imperfect interfaces also enables shifting of the
topological phase transition point within a broader frequency range for
longitudinal waves and a confined range for transverse waves. The transition of
topologically protected interface modes in the transmission performance of a
twenty-cell system is verified, which include altering frequencies, switching
from interface mode to edge mode. Overall, this study provides a new approach
and guideline for controlling topological phase transition in composite and
soft phononic crystal systems.Comment: 39 pages,8 figure
XNET: A Real-Time Unified Secure Inference Framework Using Homomorphic Encryption
Homomorphic Encryption (HE) presents a promising solution to securing neural networks for Machine Learning as a Service (MLaaS). Despite its potential, the real-time applicability of current HE-based solutions remains a challenge, and the diversity in network structures often results in inefficient implementations and maintenance. To address these issues, we introduce a unified and compact network structure for real-time inference in convolutional neural networks based on HE. We further propose several optimization strategies, including an innovative compression and encoding technique and rearrangement in the pixel encoding sequence, enabling a highly efficient batched computation and reducing the demand for time-consuming HE operations. To further expedite computation, we propose a GPU acceleration engine to leverage the massive thread-level parallelism to speed up computations. We test our framework with the MNIST, Fashion-MNIST, and CIFAR-10 datasets, demonstrating accuracies of 99.14%, 90.8%, and 61.09%, respectively. Furthermore, our framework maintains a steady processing speed of 0.46 seconds on a single-thread CPU, and a brisk 31.862 milliseconds on an A100 GPU for all datasets. This represents an enhancement in speed more than 3000 times compared to pervious work, paving the way for future explorations in the realm of secure and real-time machine learning applications
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