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Message from Guest Editors of the CVM 2024 Special Issue

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Computational Visual Media 2024年第4期10卷 611-612页

作者： Andrei Sharf Fang-Lue Zhang department of computer science ben-gurion university beer-sheva 84105 Israel School of Engineering and computer science Victoria university of Wellington Wellington6012 NewZealand

The Computational Visual Media(CVM)conference series is intended to provide a prominent international forum for exchanging innovative research ideas and significant computational methodologies that either underpin or ... 详细信息

关键词： CVM Guest Media

Shell stand:Stable thin shell models for 3D fabrication

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Computational Visual Media 2024年第4期10卷 643-657页

作者： Yu Xing Xiaoxuan Wang Lin Lu Andrei Sharf Daniel Cohen-Or Changhe Tu School of computer science and Technology Shandong UniversityQingdao 266237China department of computer science Ben-Gurion UniversityBeer-Sheva 84105Israel department of computer science Tel-Aviv UniversityTel Aviv 6997801Israel

A thin shell model refers to a surface or structure,where the object’s thickness is considered *** the context of 3D printing,thin shell models are characterized by having lightweight,hollow structures,and reduced material *** versatility and visual appeal make them popular in various fields,such as cloth simulation,character skinning,and for thin-walled structures like leaves,paper,or metal ***,optimization of thin shell models without external support remains a challenge due to their minimal interior operational *** the same reasons,hollowing methods are also unsuitable for this *** fact,thin shell modulation methods are required to preserve the visual appearance of a two-sided surface which further constrain the problem *** this paper,we introduce a new visual disparity metric tailored for shell models,integrating local details and global shape attributes in terms of visual *** method modulates thin shell models using global deformations and local thickening while accounting for visual saliency,stability,and structural ***,thin shell models such as bas-reliefs,hollow shapes,and cloth can be stabilized to stand in arbitrary orientations,making them ideal for 3D printing.

关键词： surface models thin shell models optimization balance stability 3D fabrication

“Hot”electrons in metallic nanostructures—nonthermal carriers or heating?

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Light(science & Applications) 2019年第1期8卷 368-375页

作者： Yonatan Dubi Yonatan Sivan department of Chemistry and the Ilse Katz Center for nanoscale science and Technology Ben-Gurion University of the NegevBeer ShevaIsrael School of Electrical and computer Engineering and the Ilse Katz Center for nanoscale science and Technology Ben-Gurion University of the NegevBeer ShevaIsrael

Understanding the interplay between illumination and the electron distribution in metallic nanostructures is a crucial step towards developing applications such as plasmonic photocatalysis for green fuels,nanoscale photodetection and *** this interplay is challenging,as it requires taking into account all channels of energy flow in the electronic ***,we develop such a theory,which is based on a coupled Boltzmann-heat equations and requires only energy conservation and basic thermodynamics,where the electron distribution,and the electron and phonon(lattice)temperatures are determined *** this theory to realistic illuminated nanoparticle systems,we find that the electron and phonon temperatures are similar,thus justifying the(classical)singletemperature *** show that while the fraction of high-energy“hot”carriers compared to thermalized carriers grows substantially with illumination intensity,it remains extremely small(on the order of 10^(-8)).Importantly,most of the absorbed illumination power goes into heating rather than generating hot carriers,thus rendering plasmonic hot carrier generation extremely *** formulation allows for the first time a unique quantitative comparison of theory and measurements of steady-state electron distributions in metallic nanostructures.

关键词： illumination theory rendering

On-chip optical vortex-based nanophotonic detectors

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Light(science & Applications) 2020年第1期9卷 920-921页

作者： Alina Karabchevsky School of Electrical and computer Engineering Ben-Gurion University of the NegevBeer-Sheva 8410501Israel

An on-chip optical vortex detector based on spin-Hall nanoslits is *** detector is sensitive to the spin of the incoming beam and can simultaneously record the polarization and phase *** the reported device relies on fast decaying surface plasmons,it represents an important step forward in the development of optical vortexbased integrated photonic devices.

关键词： vortex hough simultaneous

Targeting the overexpressed mitochondrial protein VDAC1 in a mouse model of Alzheimer’s disease protects against mitochondrial dysfunction and mitigates brain pathology

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Translational Neurodegeneration 2022年第1期11卷 1-30页

作者： Ankit Verma Anna Shteinfer-Kuzmine Nikita Kamenetsky Srinivas Pittala Avijit Paul Edna Nahon Crystal Alberto Ouro Vered Chalifa-Caspi Swaroop Kumar Pandey Alon Monsonego Noga Vardi Shira Knafo Varda Shoshan-Barmatz department of Life sciences Ben-Gurion University of the Negev84105 Beer-ShevaIsrael National Institute for Biotechnology in the Negev Ben-Gurion University of the Negev84105 Beer-ShevaIsrael Achva Academic College 79804 ShikmimIsrael department of Physiology Faculty of Health SciencesBen-Gurion University of the Negev84105 Beer-ShevaIsrael Ilse Katz Institute for Nanoscale science and Technology Ben-Gurion University of the Negev84105 Beer-ShevaIsrael The Shraga Segal department of Microbiology Immunologyand GeneticsFaculty of Health SciencesBen-Gurion University of the Negev84105 Beer-ShevaIsrael NeuroAging Group(NEURAL) Clinical Neurosciences Research Laboratory(LINC)Health Research Institute of Santiago de Compostela(IDIS)15706 Santiago de CompostelaSpain.

Background Alzheimer’s disease(AD)exhibits mitochondrial dysfunctions associated with dysregulated metabolism,brain inflammation,synaptic loss,and neuronal cell *** a key protein serving as the mitochondrial gatekeeper,the voltage-dependent anion channel-1(VDAC1)that controls metabolism and Ca2+homeostasis is positioned at a convergence point for various cell survival and death ***,we targeted VDAC1 with VBIT-4,a newly developed inhibitor of VDAC1 that prevents its pro-apoptotic activity,and mitochondria *** To address the multiple pathways involved in AD,neuronal cultures and a 5×FAD mouse model of AD were treated with *** addressed multiple topics related to the disease and its molecular mechanisms using immunoblotting,immunofluorescence,q-RT-PCR,3-D structural analysis and several behavioral *** In neuronal cultures,amyloid-beta(Aβ)-induced VDAC1 and p53 overexpression and apoptotic cell death were prevented by *** an AD-like 5×FAD mouse model,we showed that VDAC1 was overexpressed in neurons surrounding Aβplaques,but not in astrocytes and microglia,and this was associated with neuronal cell ***-4 prevented the associated pathophysiological changes including neuronal cell death,neuroinflammation,and neuro-metabolic ***-4 also switched astrocytes and microglia from being pro-inflammatory/neurotoxic to neuroprotective ***,VBIT-4 prevented cognitive decline in the 5×FAD mice as evaluated using several behavioral assessments of cognitive ***,VBIT-4 protected against AD pathology,with no significant change in phosphorylated Tau and only a slight decrease in Aβ-plaque *** The study suggests that mitochondrial dysfunction with its gatekeeper VDAC1 is a promising target for AD therapeutic intervention,and VBIT-4 is a promising drug candidate for AD treatment.

关键词： Alzheimer’s disease Metabolism Mitochondria Neuroinflammation VDAC1

Ultra-broadband spectrometer on a chip of picometer scale resolution

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Light(science & Applications) 2023年第10期12卷 2001-2002页

作者： Alina Karabchevsky School of Electrical and computer Engineering Ben-Gurion University of the NegevBeer-Sheva8410501Israel

A reconfigurable photonic integrated circuit was developed to operate as an ultra-broadband spectrometer on SiN chip resolving spectral lines with picometer precision and thermal stability of±2℃.

关键词： comet resolution stability

Perovskite beyond solar: toward novel developments of lasers and detectors for photonic circuits

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Light(science & Applications) 2023年第7期12卷 1182-1183页

作者： Alina Karabchevsky School of Electrical and computer Engineering Ben-Gurion University of the NegevBeer-Sheva8410501Israel

Possessing intriguing optoelectronic properties,metal halide perovskites can serve as a large-scale platform for miniaturized photonic circuits with on-chip active devices such as lasers and detectors.

关键词： beyond lasers optoelectronic

Single-shot circular dichroism spectroscopy

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Light(science & Applications) 2022年第6期11卷 1021-1022页

作者： Alina Karabchevsky ben-gurion university of the Negev School of Electrical and Computer EngineeringDepartment of Photonics and ElectroopticsBeer-Sheva 8410501Israel

Circular dichroism spectroscopy can be optimized to measure the scattering circular dichroism response of a single chiral nanostructure with a single shot.

关键词： circular dichroism spectroscopy

ConfDTree: A Statistical Method for Improving Decision Trees

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Journal of computer science & Technology 2014年第3期29卷 392-407页

作者： Gilad Katz Asaf Shabtai Lior Rokach Nir Ofek department of Information Systems Engineering Ben-Gurion University of the NegevBeer Sheva 8410501Israel Telekom Innovation Laboratories Ben-Gurion University of the NegevBeer Sheva 8410501Israel

Decision trees have three main disadvantages： reduced performance when the training set is small; rigid decision criteria; and the fact that a single ＂uncharacteristic＂ attribute might ＂derail＂ the classification process. In this paper we present ConfDTree （Confidence-Based Decision Tree） -- a post-processing method that enables decision trees to better classify outlier instances. This method, which can be applied to any decision tree algorithm, uses easy-to-implement statistical methods （confidence intervals and two-proportion tests） in order to identify hard-to-classify instances and to propose alternative routes. The experimental study indicates that the proposed post-processing method consistently and significantly improves the predictive performance of decision trees, particularly for small, imbalanced or multi-class datasets in which an average improvement of 5%-9% in the AUC performance is reported.

关键词： decision tree confidence interval imbalanced dataset