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检索条件"机构=Faculty of Electrical Engineering and Computing in Zagreb"

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Looking Right is Sometimes Right: Investigating the Capabilities of Decoder-only LLMs for Sequence Labeling 62

Looking Right is Sometimes Right: Investigating the Capabili...

引用

Findings of the 62nd Annual Meeting of the Association for Computational Linguistics, ACL 2024

作者： Dukić, David Šnajder, Jan TakeLab Faculty of Electrical Engineering and Computing University of Zagreb Croatia

ISBN: (纸本)9798891760998

Pre-trained language models based on masked language modeling (MLM) excel in natural language understanding (NLU) tasks. While fine-tuned MLM-based encoders consistently outperform causal language modeling decoders of comparable size, recent decoder-only large language models (LLMs) perform on par with smaller MLM-based encoders. Although their performance improves with scale, LLMs fall short of achieving state-of-the-art results in information extraction (IE) tasks, many of which are formulated as sequence labeling (SL). We hypothesize that LLMs' poor SL performance stems from causal masking, which prevents the model from attending to tokens on the right of the current token. Yet, how exactly and to what extent LLMs' performance on SL can be improved remains unclear. We explore techniques for improving the SL performance of open LLMs on IE tasks by applying layer-wise removal of the causal mask (CM) during LLM fine-tuning. This approach yields performance gains competitive with state-of-the-art SL models, matching or outperforming the results of CM removal from all blocks. Our findings hold for diverse SL tasks, demonstrating that open LLMs with layer-dependent CM removal outperform strong MLM-based encoders and even instruction-tuned LLMs. © 2024 Association for Computational Linguistics.

关键词： Decoding

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Vessel Registration Number Detection and Recognition System

Vessel Registration Number Detection and Recognition System

引用

2025 IEEE/CVF Winter Conference on Applications of Computer Vision Workshops, WACVW 2025

作者： Fabijanić, Matej Magdalenić, Maja Obradović, Juraj Kapetanović, Nadir Ferreira, Fausto Mišković, Nikola University of Zagreb Faculty of Electrical Engineering and Computing Croatia

ISBN: (纸本)9798331536626

Accurate identification of ships is vital for global trade and maritime security. More specifically, reliable recognition of the vessel registration number helps in orderly navigation and port use for maritime transportation activities. The purpose of this research was to develop and analyze different methods for detecting vessel registration numbers with a monocular camera. We used existing OCR tools available online and modified them to improve their out-of-the-box performance. Three neural network-based text detection methods were developed and tested. All three methods use different text region detection modules for real scenes, while available OCR software is used in all of them for specific character recognition. The methods are compared using standard optical character recognition metrics. The best method that was developed uses a deep neural network model to detect a vessel, then another fine-tuned neural network model to detect a text region, coupled with deterministic image processing methods to improve picture quality. In conclusion, with an accuracy of 72.69% recognized characters of vessel registrations using a limited image dataset, we achieve satisfactory results. Further effort focusing on collecting and annotating diverse maritime environment datasets featuring footage of vessels with visible registration numbers is needed to have a more reliable and robust system. © 2025 IEEE.

关键词： Optical character recognition

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Validity of the Ballistic Top-of-the-Barrier Model for FETs Based on 2D Material Nanoribbons 47

Validity of the Ballistic Top-of-the-Barrier Model for FETs ...

引用

47th ICT and Electronics Convention, MIPRO 2024

作者： Matić, M. Poljak, M. Faculty Of Electrical Engineering And Computing University Of Zagreb Computational Nanoelectronics Group Zagreb Croatia

ISBN: (纸本)9798350382495

We investigate our in-house implementation of the non-equilibrium Green's function (NEGF) formalism in combination with the top-of-the-barrier (ToB) ballistic model, as implemented in our QUDEN (from Quantumtransport Device engineering in Nanoelectronics) simulator. We calibrate QUDEN on self-consistent NEGF-Poisson simulations of graphene nanoribbon (GNR) field-effect transistor (FET) with ∼ 15 nm channel in the commercial software QuantumATK. It is demonstrated that QUDEN device predicting ability is adequate for nanoribbon-based FETs, except in materials with ultra-low effective mass. QUDEN is then employed to explore monolayer zirconium-disulfide (ZrS2) nanoribbon (ZrS2 NR) nFETs, using Hamiltonians from density functional theory (DFT) calculations. We show that ZrS2 NR nFET exhibits 32 % lower ON-state current compared to GNR nFET, which is attributed to 36 % higher electron effective mass in ZrS2 NRs than in GNRs. Our results show that DFT-based Hamiltonians and NEGF-ToB model can be efficiently used for accurate investigation of nanoribbon-based devices. © 2024 IEEE.

关键词： Density functional theory

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Comparison of Linear and Nonlinear Controllers on a Mechatronic System 47

Comparison of Linear and Nonlinear Controllers on a Mechatro...

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47th ICT and Electronics Convention, MIPRO 2024

作者： Patrlj, Leo Novoselnik, Branimir Baotić, Mato University Of Zagreb Faculty Of Electrical Engineering And Computing Unska 3 Zagreb10000 Croatia

ISBN: (纸本)9798350382495

This technical paper presents the application of various control methods on a mechatronic laboratory setup of a rotary inverted pendulum. The full nonlinear dynamic model of the pendulum is obtained using Euler-Langrange method and it is further simplified for the purpose of designing different controllers for stabilization of the pendulum in the upright position. In particular, we compare two nonlinear control methods (sliding mode control and model predictive control) to two classical linear control methods (proportional-derivative control and linear-quadratic control). All considered control methods are briefly explained and corresponding controllers are derived and tested on the experimental setup. © 2024 IEEE.

关键词： Sliding mode control

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Graph Databases: An Alternative to Relational Databases in an Interconnected Big Data Environment 47

Graph Databases: An Alternative to Relational Databases in a...

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47th ICT and Electronics Convention, MIPRO 2024

作者： Pavliš, Robert University Of Zagreb Faculty Of Electrical Engineering And Computing Unska 3 Zagreb10000 Croatia

ISBN: (纸本)9798350382495

As the global volume of data continues to rise at an unprecedented rate, the challenges of storing and analyzing data are becoming more and more highlighted. This is especially apparent when the data are heavily interconnected. The traditional methods of storing and analyzing data such as relational databases often encounter difficulties when dealing with large amounts of data and this is even more pronounced when the data exhibits intricate interconnections. This paper examines graph databases as an alternative to relational databases in an interconnected Big Data environment. It will also show the theoretical basis behind graph databases and how they outperform relational databases in such an environment, but also why they are better suited for this kind of environment than other NoSQL alternatives. A state of the art in graph databases and how they compare to relational databases in various scenarios will also be presented in this paper. © 2024 IEEE.

关键词： Big data

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Prototype measurement system information correlation with LLS data 37

Prototype measurement system information correlation with LL...

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37th International Conference on Lightning Protection, ICLP 2024

作者： Vuković, Franjo Filipović-Grčić, Božidar Stipetić, Nina Franc, Bojan Brändlein, Dirk University of Zagreb Faculty of Electrical Engineering and Computing Zagreb Croatia nowcast GmbH Germany

ISBN: (纸本)9783800764174

This paper focuses on analyzing the temporal and spatial correlation between data obtained from a lightning location system and a prototype lightning current waveform measurement system installed on a wind turbine in Croatia. The prototype contains two Rogowski coils with varying frequency and amplitude ranges to efficiently capture continuing currents, continuing-current impulses, and return strokes. In this study, several lightning events detected by the lightning location system in the wind turbine area and measured by the prototype are correlated based on their timestamps. Specifically, stroke locations determined by the lightning location system for these events are analyzed with respect to wind turbine collection zones, and their GPS timestamps are compared to those determined by the prototype measurement system. For one lightning event, the high-speed camera data is also used for event confirmation. Frames of the strokes from that particular lightning event, with precise GPS timestamps, are presented. The high-speed camera is GPS synchronized independently from the prototype measurement system. Additionally, the prototype system registers lightning flashes, i.e., strokes hitting two neighboring wind turbines that share the same cable connection to the local substation as the one on which the prototype waveform lightning current system is installed. Strokes to neighboring wind turbines are also discussed in paper by analyzing prototype timestamps and lightning location system timestamps and amplitudes, focusing on one particular lightning event. © 2024 IEEE, © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： High speed cameras

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Quantum-Transport Exploration of Design Space for Majorana Zero Modes in Finite Kitaev Chains 47

Quantum-Transport Exploration of Design Space for Majorana Z...

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47th ICT and Electronics Convention, MIPRO 2024

作者： Poljak, M. University Of Zagreb Computational Nanoelectronics Group Faculty Of Electrical Engineering And Computing Zagreb Croatia

ISBN: (纸本)9798350382495

Quantum transport simulations are employed to investigate the properties of short finite Kitaev chains, with a focus on exploring the possible design space. We numerically investigate how the Kitaev chain behaves when system parameters are varied and study the transport characteristics, including direct tunneling and Andreev processes. We examine how the chain length provides topological protection of Majorana zero modes (MZMs) and demonstrate how increasing the length alleviates Majorana oscillations that could be detrimental for topological quantum computing with MZMs. © 2024 IEEE.

关键词： Quantum chemistry

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Investigation of the One-Dimensional Semiconductor I4Si2 as a FET Channel Material 47

Investigation of the One-Dimensional Semiconductor I4Si2 as ...

引用

47th ICT and Electronics Convention, MIPRO 2024

作者： Vukadin, T. Matić, M. Poljak, M. University Of Zagreb Computational Nanoelectronics Group Faculty Of Electrical Engineering And Computing Zagreb Croatia

ISBN: (纸本)9798350382495

One-dimensional (1D) semiconductor I4Si2 is analyzed in terms of its appropriateness as a channel material for gate-all-around field-effect transistor (GAA FETs). We combine wannierized Hamiltonians obtained from density-functional theory (DFT) calculations with Green's function formalism to explore the electronic and transport properties of I4Si2, and ballistic performance of I4Si2 GAA FETs. We find that I4Si2 GAA FET exhibits a high ballistic ON-state current of 3.13 mA / μ m with an ON-OFF switching ratio of ∼ 3 × 105, which fulfils the requirements of IEEE International Roadmap for Devices and Systems (IRDS). These findings are supported and explained by examining the band structure, transmission, density of states, channel charge density, total and quantum capacitance, and electron injection velocity in the 1D semiconductor I4Si2 © 2024 IEEE.

关键词： Density functional theory

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Towards Mechanistic Interpretability for Autoencoder compression of EEG signals 2

Towards Mechanistic Interpretability for Autoencoder compres...

引用

Joint of the 2nd World Conference on eXplainable Artificial Intelligence Late-Breaking Work, Demos and Doctoral Consortium, xAI-2024:LB/D/DC

作者： Hegedić, Leon Hobor, Luka Marić, Nikola Rogošić, Martin Ante Brcic, Mario University of Zagreb Faculty of Electrical Engineering and Computing Unska ulica 3 Zagreb Croatia

Convolutional Variational Autoencoders (VAEs) have found extensive application in dimensionality reduction, data compressibility, assessment, and signal analysis. However, a comprehensive understanding of their internal mechanisms remains elusive. This study aims to use mechanistic interpretability to elucidate the inner workings of VAEs. By training VAEs on images generated by interpolating EEG signals from the human brain and analyzing the resulting latent space, as well as the signal propagation through the network layers, we aim to construct an explanation of how these specific models internally analyze the generated images. Since we work under hardware constraints, we devised an iterative approach that breaks big task into easier, more manageable steps. © 2024 Copyright for this paper by its authors.

关键词： Convolution

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Impact of Vacancies on the Transport Properties of Monolayer Germanium-Sulfide Nanoribbons 47

Impact of Vacancies on the Transport Properties of Monolayer...

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47th ICT and Electronics Convention, MIPRO 2024

作者： Jaram, J. Matić, M. Poljak, M. University Of Zagreb Computational Nanoelectronics Group Faculty Of Electrical Engineering And Computing Zagreb Croatia

ISBN: (纸本)9798350382495

Quantum transport simulations are employed to investigate the impact of vacancies on the transport properties of monolayer germanium-sulfide (GeS) nanoribbons (GeSNRs). We statistically investigate the impact of vacancy percentage (Pv) on the transmission, transport gap, and electron and hole conductance of GeSNRs. We show that the increase of PV significantly degrades the transmission, especially near the conduction band minimum and valence band maximum that are the most important for transport in electron devices. Furthermore, a linear increase of the transport gap with PV is reported, with 0.02eV increase of the gap per 1 % of Pv. Finally, carrier conduction shows a hyperbolic decreasing dependence on PV with conductance lowered by as much as ∼ 5 × in GeSNRs with only 1 % of vacancies. © 2024 IEEE.

关键词： Transport properties

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