405 research outputs found
Optimization of Hydrogen-fueled Engine Ignition Timing Based on L-M Neural Network Algorithm
In view of the improvement measures of the optimization control algorithm for the ignition system of the hydrogen-fueled engine, the L-M neural network algorithm, Powell neural network algorithm and the traditional BP neural network algorithm are used to optimize the ignition system. The results showed that L-M algorithm not only can accurately predict the hydrogen-fueled engine ignition timing, but also has high precision, high convergence speed, a simple model and other outstanding advantages in the training process, which can greatly reduce the workload of human engine bench tests. Only a small amount of engine bench test is carried out, and the obtained sample data can be used to predict the ignition timing under the whole working conditions. The mean square error of the optimization results based on L-M algorithm arrives at 0.0028 after 100 times of calculation, the maximum value of absolute error arrives at 0.2454, and the minimum value of absolute error arrives at 0.00426
A Bayesian Failure Prediction Network Based on Text Sequence Mining and Clustering
The purpose of this paper is to predict failures based on textual sequence data. The current failure prediction is mainly based on structured data. However, there are many unstructured data in aircraft maintenance. The failure mentioned here refers to failure types, such as transmitter failure and signal failure, which are classified by the clustering algorithm based on the failure text. For the failure text, this paper uses the natural language processing technology. Firstly, segmentation and the removal of stop words for Chinese failure text data is performed. The study applies the word2vec moving distance model to obtain the failure occurrence sequence for failure texts collected in a fixed period of time. According to the distance, a clustering algorithm is used to obtain a typical number of fault types. Secondly, the failure occurrence sequence is mined using sequence mining algorithms, such as-PrefixSpan. Finally, the above failure sequence is used to train the Bayesian failure network model. The final experimental results show that the Bayesian failure network has higher accuracy for failure prediction
AgentBoard: An Analytical Evaluation Board of Multi-turn LLM Agents
Evaluating large language models (LLMs) as general-purpose agents is
essential for understanding their capabilities and facilitating their
integration into practical applications. However, the evaluation process
presents substantial challenges. A primary obstacle is the benchmarking of
agent performance across diverse scenarios within a unified framework,
especially in maintaining partially-observable environments and ensuring
multi-round interactions. Moreover, current evaluation frameworks mostly focus
on the final success rate, revealing few insights during the process and
failing to provide a deep understanding of the model abilities. To address
these challenges, we introduce AgentBoard, a pioneering comprehensive benchmark
and accompanied open-source evaluation framework tailored to analytical
evaluation of LLM agents. AgentBoard offers a fine-grained progress rate metric
that captures incremental advancements as well as a comprehensive evaluation
toolkit that features easy assessment of agents for multi-faceted analysis
through interactive visualization. This not only sheds light on the
capabilities and limitations of LLM agents but also propels the
interpretability of their performance to the forefront. Ultimately, AgentBoard
serves as a significant step towards demystifying agent behaviors and
accelerating the development of stronger LLM agents.Comment: Preprin
Reconstruction Distortion of Learned Image Compression with Imperceptible Perturbations
Learned Image Compression (LIC) has recently become the trending technique
for image transmission due to its notable performance. Despite its popularity,
the robustness of LIC with respect to the quality of image reconstruction
remains under-explored. In this paper, we introduce an imperceptible attack
approach designed to effectively degrade the reconstruction quality of LIC,
resulting in the reconstructed image being severely disrupted by noise where
any object in the reconstructed images is virtually impossible. More
specifically, we generate adversarial examples by introducing a Frobenius
norm-based loss function to maximize the discrepancy between original images
and reconstructed adversarial examples. Further, leveraging the insensitivity
of high-frequency components to human vision, we introduce Imperceptibility
Constraint (IC) to ensure that the perturbations remain inconspicuous.
Experiments conducted on the Kodak dataset using various LIC models demonstrate
effectiveness. In addition, we provide several findings and suggestions for
designing future defenses.Comment: 7 page
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