3,188 research outputs found
Some coincidence point results for T-contraction mappings on partially ordered b-metric spaces and applications to integral equations
In this paper, we prove some fixed point results for T-contraction mappings in partially ordered b-metric spaces, that generalize the main results of [H. Huang, S. Radenovič, J. Vujakovič, On some recent coincidence and immediate consequences in partially ordered b-metric spaces, Fixed Point Theory Appl., 2015, Paper No. 63]. As an application, we discuss the existence for a solution of a nonlinear integral equation
Anti-DreamBooth: Protecting users from personalized text-to-image synthesis
Text-to-image diffusion models are nothing but a revolution, allowing anyone,
even without design skills, to create realistic images from simple text inputs.
With powerful personalization tools like DreamBooth, they can generate images
of a specific person just by learning from his/her few reference images.
However, when misused, such a powerful and convenient tool can produce fake
news or disturbing content targeting any individual victim, posing a severe
negative social impact. In this paper, we explore a defense system called
Anti-DreamBooth against such malicious use of DreamBooth. The system aims to
add subtle noise perturbation to each user's image before publishing in order
to disrupt the generation quality of any DreamBooth model trained on these
perturbed images. We investigate a wide range of algorithms for perturbation
optimization and extensively evaluate them on two facial datasets over various
text-to-image model versions. Despite the complicated formulation of DreamBooth
and Diffusion-based text-to-image models, our methods effectively defend users
from the malicious use of those models. Their effectiveness withstands even
adverse conditions, such as model or prompt/term mismatching between training
and testing. Our code will be available at
\href{https://github.com/VinAIResearch/Anti-DreamBooth.git}{https://github.com/VinAIResearch/Anti-DreamBooth.git}.Comment: Project page: https://anti-dreambooth.github.io
Explain by Evidence: An Explainable Memory-based Neural Network for Question Answering
Interpretability and explainability of deep neural networks are challenging
due to their scale, complexity, and the agreeable notions on which the
explaining process rests. Previous work, in particular, has focused on
representing internal components of neural networks through human-friendly
visuals and concepts. On the other hand, in real life, when making a decision,
human tends to rely on similar situations and/or associations in the past.
Hence arguably, a promising approach to make the model transparent is to design
it in a way such that the model explicitly connects the current sample with the
seen ones, and bases its decision on these samples. Grounded on that principle,
we propose in this paper an explainable, evidence-based memory network
architecture, which learns to summarize the dataset and extract supporting
evidences to make its decision. Our model achieves state-of-the-art performance
on two popular question answering datasets (i.e. TrecQA and WikiQA). Via
further analysis, we show that this model can reliably trace the errors it has
made in the validation step to the training instances that might have caused
these errors. We believe that this error-tracing capability provides
significant benefit in improving dataset quality in many applications.Comment: Accepted to COLING 202
Self-adaptive Controllers for Renewable Energy Communities Based on Transformer Loading Estimation
In this paper, self-adaptive controllers for renewable energy communities based on data-driven approach are proposed to mitigate the voltage rise and transformer congestion at the community level. In the proposed approach, the transformer loading percentage is estimated by the trained data-driven model, which uses the extreme gradient boosting regression algorithm based on a measurement set acquired from critical coupling points of the communities. To avoid voltage rise issues, the droop control parameters (i.e., voltage threshold for P - V, Q - V curves) are adaptively tuned based on the solar irradiance availability and estimated transformer loading. The proposed approach has been tested in the IEEE European LV distribution network. Results showed that the control approach could effectively reduce 22.2 % of the total overloaded instances, while still keeping voltage magnitude in the operation range. This method can help DSOs manage voltage violation and congestion without further communication
A Fuzzy Logic Based Method for Analysing Test Results
Network operators must perform many tasks to ensure smooth operation of the network, such as planning, monitoring, etc. Among those tasks, regular testing of network performance, network errors and troubleshooting is very important. Meaningful test results will allow the operators to evaluate network performanceof any shortcomings and to better plan for network upgrade. Due to the diverse and mainly unquantifiable nature of network testing results, there is a needs to develop a method for systematically and rigorously analysing these results.
In this paper, we present STAM (System Test-result Analysis Method) which employs a bottom-up hierarchical processing approach using Fuzzy logic. STAM is capable of combining all test results into a quantitative description of the network performance in terms of network stability, the significance of various network erros, performance of each function blocks within the network. The validity of this method has been successfully demonstrated in assisting the testing of a VoIP system at the Research Instiute of Post and Telecoms in Vietnam.
The paper is organized as follows. The first section gives an overview of fuzzy logic theory the concepts of which will be used in the development of STAM. The next section describes STAM. The last section, demonstrating STAM’s capability, presents a success story in which STAM is successfully applied
GUNNEL: Guided Mixup Augmentation and Multi-View Fusion for Aquatic Animal Segmentation
Recent years have witnessed great advances in object segmentation research.
In addition to generic objects, aquatic animals have attracted research
attention. Deep learning-based methods are widely used for aquatic animal
segmentation and have achieved promising performance. However, there is a lack
of challenging datasets for benchmarking. In this work, we build a new dataset
dubbed "Aquatic Animal Species." We also devise a novel GUided mixup
augmeNtatioN and multi-viEw fusion for aquatic animaL segmentation (GUNNEL)
that leverages the advantages of multiple view segmentation models to
effectively segment aquatic animals and improves the training performance by
synthesizing hard samples. Extensive experiments demonstrated the superiority
of our proposed framework over existing state-of-the-art instance segmentation
methods
Generating Adversarial Examples with Task Oriented Multi-Objective Optimization
Deep learning models, even the-state-of-the-art ones, are highly vulnerable
to adversarial examples. Adversarial training is one of the most efficient
methods to improve the model's robustness. The key factor for the success of
adversarial training is the capability to generate qualified and divergent
adversarial examples which satisfy some objectives/goals (e.g., finding
adversarial examples that maximize the model losses for simultaneously
attacking multiple models). Therefore, multi-objective optimization (MOO) is a
natural tool for adversarial example generation to achieve multiple
objectives/goals simultaneously. However, we observe that a naive application
of MOO tends to maximize all objectives/goals equally, without caring if an
objective/goal has been achieved yet. This leads to useless effort to further
improve the goal-achieved tasks, while putting less focus on the
goal-unachieved tasks. In this paper, we propose \emph{Task Oriented MOO} to
address this issue, in the context where we can explicitly define the goal
achievement for a task. Our principle is to only maintain the goal-achieved
tasks, while letting the optimizer spend more effort on improving the
goal-unachieved tasks. We conduct comprehensive experiments for our Task
Oriented MOO on various adversarial example generation schemes. The
experimental results firmly demonstrate the merit of our proposed approach. Our
code is available at \url{https://github.com/tuananhbui89/TAMOO}
Bioethanol Production from Lignocellulosic Biomass
An overview of the basic technology to produce bioethanol from lignocellulosic biomass is presented in this context. The conventional process includes two main steps. First, lignocellulose must be pretreated in order to remove lignin and enhance the penetration of hydrolysis agents without chemically destruction of cellulose and hemicellulose. Second, the pretreated material is converted to bioethanol by hydrolysis and fermentation. Some typical published studies and popular processing methods in attempts to improve the biomass conversion to bioethanol and increase the cost-effectiveness are also introduced briefly. Herein, the refinery of the resulted raw bioethanol mixture to obtain higher concentrated solution is not regarded
Examining the effects of lead on the life of larval zebrafish (1-7 days old)
Lead (Pb) is a toxic metal and and can cause variety of disorders and effect on neu-ronal function and neurodevelopment. Using zebrafish as a model, the aim of this study was to evaluate the effects of concentrations of Pb2+ on the life of zebrafish larvae (from 1 to 7 days old)yesBelgorod State Universit
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