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A withdrawal prediction model of at-risk learners based on behavioural indicators

International Journal of Web-Based Learning and Teaching Technologies 2021年第2期16卷 32-53页

作者： Hlioui, Fedia Aloui, Nadia Gargouri, Faiez Multimedia Information System and Advanced Computing Laboratory University of Sfax Sfax Tunisia CCSE Department SWE Jeddah University Saudi Arabia and University of Sfax Tunisia and ISIMS Sfax Tunisia

Nowadays, the virtual learning environment has become an ideal tool for professional self-development and bringing courses for various learner audiences across the world. There is currently an increasing interest in researching the topic of learner dropout and low completion in distance learning, with one of the main concerns being elevated rates of occurrence. Therefore, the early prediction of learner withdrawal has become a major challenge, as well as identifying the factors, which contribute to this increasingly occurring phenomenon. In that regard, this manuscript presents a framework for withdrawal prediction model for the data from The Open University, one of the largest distance learning institutions. For that purpose, we start by pre-processing the dataset and tackling the challenge of discretization process and unbalanced data. Secondly, this paper identifies the semantical issues of raw data by introducing new behavioural indicators. Finally, we reckon on machine learning algorithms for withdrawal prediction model to understand the lack of learners’ commitment at an early stage. Copyright © 2021, IGI Global. Copying or distributing in print or electronic forms without written permission of IGI Global is prohibited.

关键词： Learning algorithms

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Experimentation and evaluation of a generator of adaptable web applications

Experimentation and evaluation of a generator of adaptable w...

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XXVIIIeme Congres INFORSID 2010 - 28th Conference INFORSID 2010

作者： Djemaa, Raoudha Ben Abdallah, Fatma Ben Amous, Ikram Hamadou, Abdelmajid Ben MIRACL Multimedia InfoRmation systems and Advanced Computing Laboratory Route de Tunis Km 10 BP 242 Cité El Ons Sfax 3021 Tunisia

The Web evolves to contents integrating increasingly rich and varied media reached using very diverse accessAA,A device. This environment very heterogeneous requires that multimedia information sent by the server is adapted to the precise conditions of their use. To answer this adaptation, a set of methods, languages and architectures were developed. This article is a contribution in this direction. In this work, we present a generator of the adaptable Web applications (AWA). An experimental study of the generator was undertaken on various devices of access (PC, PDA, mobile telephone.). The results obtained were evaluated by a study of the performances carried out to test the effectiveness of generator (rate of satisfaction of the users, profit in memory capacity, execution time, etc).

关键词： Adaptable web application Adaptation of the media objects Experimentation and evaluation Generator Sensitivity to the context

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A formal modeling method to enrich the Arabic treebank ATB with syntactic properties 7

A formal modeling method to enrich the Arabic treebank ATB w...

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7th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management, IC3K 2015

作者： Bahloul, Raja Bensalem Haddar, Kais Blache, Philippe Multimedia InfoRmation Systems and Advanced Computing Laboratory Higher Institute of Computer Science and Multimedia Sfax Tunisia Laboratoire Parole et Langage CNRS Université de Provence Aix-en-Provence France

ISBN: (纸本)9789897581588

The enrichment of an Arabic treebank with syntactic properties can facilitate many types of parsing processes. This enrichment allows also the increase of its use in different NLP applications, the acquirement of new linguistic resources and the ease of the probabilistic parsing process by using statistics to limit the properties to the satisfied ones or to the most frequent ones. In this context, our proposed enrichment method is based on a formalization phase, a Property Grammar induction phase from a source treebank and a treebank regeneration phase with a new syntactic property-based representation. Starting with a formalization phase in our enrichment problem may succeed its resolution procedure. In fact, it limits the specification of the data sets and the interactions between them to the used ones, which avoids any duplication. The formalization allows also the anticipation of the constraints to respect in the problem. The implementation of this enrichment method is experimented essentially on the Arabic treebank ATB. This experiment provides us with good and encouraging results and various properties of different types. Copyright © 2015 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.

关键词： Modeling languages

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Meta-Adapter for Self-Supervised Speech Models: A Solution to Low-Resource Speech Recognition Challenges 30

Meta-Adapter for Self-Supervised Speech Models: A Solution t...

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Joint 30th International Conference on Computational Linguistics and 14th International Conference on Language Resources and Evaluation, LREC-COLING 2024

作者： Chen, Yaqi Zhang, Hao Yang, Xukui Zhang, Wenlin Qu, Dan School of Information Systems Engineering Information Engineering University China Laboratory for Advanced Computing and Intelligence Engineering China

ISBN: (纸本)9782493814104

Self-supervised models have demonstrated remarkable performance in speech processing by learning latent representations from large amounts of unlabeled data. Although these models yield promising results on low-resource languages, the computational expense of fine-tuning all model parameters is prohibitively high. Adapters offer a solution by incorporating lightweight bottleneck structures into pre-trained models, enabling efficient parameter adaptation for downstream tasks. However, randomly initialized adapters often underperform in low-resource scenarios, limiting their applicability in low-resource languages. To address this issue, we develop the Meta-Adapter for self-supervised models to obtain meta-initialized parameters that facilitate quick adaptation to low-resource languages. Extensive experiments on the Common Voice and FLEURS datasets demonstrate the superior performance of Meta-Adapters on 12 low-resource languages spanning four different language families. Moreover, Meta-adapters show better generalization and extensibility than traditional pretraining methods. © 2024 ELRA Language Resource Association: CC BY-NC 4.0.

关键词： Speech processing

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A survey on hand gesture recognition for mobile devices

A survey on hand gesture recognition for mobile devices

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作者： Lahiani, Houssem Neji, Mahmoud National School of Electronics and Telecommunications University of Sfax Tunisia Tunisia Multimedia Information Systems and Advanced Computing Laboratory Faculty of Economics and Management University of Sfax Sfax Tunisia

As smartphones and mobile devices become ubiquitous in the daily life of human beings, facilitating interaction with them will have a positive impact on their use. This paper presents an emerging and important area for research on human-machine interaction, involving interaction with mobile devices. Hand gesture recognition is already a quite mature field and its integration on advanced technologies like smartphones makes a survey an interesting and needed contribution. The design of interactive mobile applications should differ from traditional desktop applications. For this purpose, the paper discusses some concepts that help to understand new challenges and introduces techniques that may be useful to properly exploit these devices. This paper gives also an overview of recent works done on vision-based and contact-based hand gesture recognition systems for mobile devices. Used techniques and approaches are also discussed. At the end, we conclude with some reflections. Copyright © 2020 Inderscience Enterprises Ltd.

关键词： Palmprint recognition

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A nanoscale memory interface scheme based on hierarchical memory mapping

A nanoscale memory interface scheme based on hierarchical me...

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Venkatasubramanian, Girish Figueiredo, Renato J. Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL 32611 United States

ISBN: (纸本)1424400783

This paper presents a nanoscale to microscale interface for crossbar based memory architectures based on multi-stage memory mappers. By designing each stage carefully and by adding sufficient number of stages the total interface module size can be reduced to a size that is 3% to 5% the size of a one-stage mapper implemented in microscale. Thus most of the area advantage in using nanoscale memories can be retained. This architecture is also technology-independent and fault-tolerant. We have developed a model which relates the various design parameters to the size of the interface module and examined these design issues in depth. © 2006 IEEE.

关键词： Nanowires

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IP over P2P: Enabling self-configuring virtual IP networks for grid computing 20

IP over P2P: Enabling self-configuring virtual IP networks f...

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20th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2006

作者： Ganguly, Arijit Agrawal, Abhishek Oscar Boykin, P. Figueiredo, Renato Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL - 32601 United States

ISBN: (纸本)1424400546

Peer-to-peer (P2P) networks have mostly focused on task oriented networking, where networks are constructed for single applications, I.e. file-sharing, DNS caching, etc. In this work, we Introduce IPOP, a system for creating virtual IP networks on top of a P2P overlay. IPOP enables seamless access to Grid resources spanning multiple domains by aggregating them Into a virtual IP network that Is completely Isolated from the physical network. The virtual IP network provided by IPOP supports deployment of existing IP-based protocols over a robust, self-configuring P2P overlay. We present Implementation details as well as experimental measurement results taken from LAN, WAN, and Planet-Lab tests. © 2006 IEEE.

关键词： Distributed computer systems

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Symbiotic evolution of photonics and artificial intelligence: a comprehensive review

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advanced Photonics 2025年第02期 8-85页

作者： Fu Feng Dewang Huo Ziyang Zhang Yijie Lou Shengyao Wang Zhijuan Gu Dong-Sheng Liu Xinhui Duan Daqian Wang Xiaowei Liu Ji Qi Shaoliang Yu Qingyang Du Guangyong Chen Cuicui Lu Yu Yu Xifeng Ren Xiaocong Yuan Zhejiang Lab Research Center for Frontier Fundamental Studies Westlake Institute for Optoelectronics Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization Beijing Institute of Technology School of Physics Center for Interdisciplinary Science of Optical Quantum and NEMS Integration Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics University of Science and Technology of China CAS Key Laboratory of Quantum Information University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum Physics Zhejiang Lab Research Center for Life Sciences Computing

The rapid advancement of artificial intelligence(AI) has significantly impacted photonics, creating a symbiotic relationship that accelerates the development and applications of both fields. From the perspective of AI aiding photonics, deep-learning methods and various intelligent algorithms have been developed for designing complex photonic structures, where traditional design approaches fall short. AI's capability to process and analyze large data sets has enabled the discovery of novel materials, such as for photovoltaics,leading to enhanced light absorption and efficiency. AI is also significantly transforming the field of optical imaging with improved performance. In addition, AI-driven techniques have revolutionized optical communication systems by optimizing signal processing and enhancing the bandwidth and reliability of data transmission. Conversely, the contribution of photonics to AI is equally profound. Photonic technologies offer unparalleled advantages in the development of AI hardware, providing solutions to overcome the bottlenecks of electronic systems. The implementation of photonic neural networks, leveraging the high speed and parallelism of optical computing, demonstrates significant improvements in the processing speed and energy efficiency of AI computations. Furthermore, advancements in optical sensors and imaging technologies not only enrich AI applications with high-quality data but also expand the capabilities of AI in fields such as autonomous vehicles and medical imaging. We provide comprehensive knowledge and a detailed analysis of the current state of the art, addressing both challenges and opportunities at the intersection of AI and photonics. The multifaceted interactions between AI and photonics will be explored, illustrating how AI has become an indispensable tool in the development of photonics and how photonics, in turn,facilitates advancements in AI. Through a collection of case studies and examples, we underscore the potential

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Decentralized dynamic host configuration in wide-area overlays of virtual workstations

Decentralized dynamic host configuration in wide-area overla...

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21st International Parallel and Distributed Processing Symposium, IPDPS 2007

作者： Ganguly, Arijit Wolinsky, David Boykin, P. Oscar Figueiredo, Renato Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL 32611 United States

ISBN: (纸本)1424409101

Wide-Area Overlays of Virtual Workstations (WOWs) have been shown to provide excellent infrastructure for deploying high throughput computing environments on commodity desktop machines by (I) offering scalability to a large number of nodes, (2) facilitating addition of new nodes even if they are behind NATs/Firewalls and (3) supporting unmodified applications and middleware. However, deployment of WOWs from scratch still requires setting up a bootstrapping network and managing centralized DHCP servers for IP address management. In this paper we describe novel techniques that allow multiple users to create independent, isolated virtual IP namespaces for their WOWs without requiring a dedicated bootstrapping infrastructure, and to provision dynamic host configuration (e.g. IP addresses) to unmodified DHCP clients without requiring the setup and management of a central DHCP server. We give qualitative and quantitative arguments to establish the feasibility of our approach, © 2007 IEEE.

关键词： Virtual reality

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Techniques for low-latency proxy selection in wide-area P2P networks

Techniques for low-latency proxy selection in wide-area P2P ...

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2010 IEEE International Symposium on Parallel and Distributed Processing, Workshops and Phd Forum, IPDPSW 2010

作者： Ganguly, Arijit Boykin, P. Oscar Figueiredo, Renato Advanced Computing and Information Systems Laboratory University of Florida Gainesville FL - 32611 United States

ISBN: (纸本)9781424465347

Connectivity constraints due to Internet route outages and symmetric NATs create situations when direct communication is not possible between nodes in P2P deployments, often leading to high latency between high-traffic nodes. In such cases, it is possible to reduce end-to-end latency by routing their communication through another node in the P2P system that is selected based on its Internet latencies to end-nodes. In this paper, we present and compare two decentralized algorithms for discovering low-latency proxy nodes between high-traffic nodes: (1) selecting a node with least Internet latency from the set of randomly-chosen neighbors to which one of the end-nodes is directly connected, and (2) discovery using latency estimates based on network coordinates. We evaluate these techniques in context of IP-over-P2P virtual networks through experiments on realistic wide-area testbeds. Our results indicate that in a network with over 400 nodes on PlanetLab, both the techniques select proxies such that the median penalties over the global optimal are within 16% and 21%, respectively, when all nodes are able to serve as proxies. We also investigate scenarios where subsets of nodes have connectivity constraints preventing them from serving as proxies.© 2010 IEEE.

关键词： Wide area networks

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