40 research outputs found
LFS-GAN: Lifelong Few-Shot Image Generation
We address a challenging lifelong few-shot image generation task for the
first time. In this situation, a generative model learns a sequence of tasks
using only a few samples per task. Consequently, the learned model encounters
both catastrophic forgetting and overfitting problems at a time. Existing
studies on lifelong GANs have proposed modulation-based methods to prevent
catastrophic forgetting. However, they require considerable additional
parameters and cannot generate high-fidelity and diverse images from limited
data. On the other hand, the existing few-shot GANs suffer from severe
catastrophic forgetting when learning multiple tasks. To alleviate these
issues, we propose a framework called Lifelong Few-Shot GAN (LFS-GAN) that can
generate high-quality and diverse images in lifelong few-shot image generation
task. Our proposed framework learns each task using an efficient task-specific
modulator - Learnable Factorized Tensor (LeFT). LeFT is rank-constrained and
has a rich representation ability due to its unique reconstruction technique.
Furthermore, we propose a novel mode seeking loss to improve the diversity of
our model in low-data circumstances. Extensive experiments demonstrate that the
proposed LFS-GAN can generate high-fidelity and diverse images without any
forgetting and mode collapse in various domains, achieving state-of-the-art in
lifelong few-shot image generation task. Surprisingly, we find that our LFS-GAN
even outperforms the existing few-shot GANs in the few-shot image generation
task. The code is available at Github.Comment: 20 pages, 19 figures, 14 tables, ICCV 2023 Poste
Π Π°Π΄ΠΈΠΎΠΏΠΎΠ³Π»ΠΎΡΠ°ΡΡΠΈΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π½Π°ΠΏΠΎΠ»Π½Π΅Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π°
Π Π°Π΄ΠΈΠΎΠΏΠΎΠ³Π»ΠΎΡΠ°ΡΡΠΈΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ (Π ΠΠ) ΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΡΠ΅ ΡΠΊΡΠ°Π½Ρ Π½Π° ΠΈΡ
ΠΎΡΠ½ΠΎΠ²Π΅ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ΄Π½ΠΈΠΌ ΠΈΠ· ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΡΡΠ΅Π΄ΡΡΠ² ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ±Π»Π΅ΠΌ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ Π±Π΅Π·ΠΎΠΏΠ°ΡΠ½ΠΎΡΡΠΈ ΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ ΡΠΎΠ²ΠΌΠ΅ΡΡΠΈΠΌΠΎΡΡΠΈ ΡΠ°Π΄ΠΈΠΎΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ ΡΠ΅Ρ
Π½ΠΈΠΊΠΈ. Π‘ΡΠ΅Π΄ΠΈ ΠΌΠ½ΠΎΠ³ΠΎΠΎΠ±ΡΠ°Π·ΠΈΡ
Π ΠΠ ΡΠ²ΠΎΡ Π½ΠΈΡΡ Π·Π°Π½ΠΈΠΌΠ°ΡΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Ρ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Π½Π°ΠΏΠΎΠ»Π½Π΅Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π°.
ΠΠ»Ρ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
Π ΠΠ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΠΏΠΎΠ»ΠΈΡΡΠΈΠ»Π΅Π½Π°, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠ΅Π³ΠΎ ΡΠ°Π·Π»ΠΈΡΠ½ΡΠ΅ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠ΅ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΡΠ΅ Π½Π°ΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΠΈ ΠΈ Π°ΡΠΌΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΡΠ»Π΅ΠΊΡΡΠΎΠΏΡΠΎΠ²ΠΎΠ΄ΡΡΠΈΠΌΠΈ ΡΠΊΠ°Π½ΡΠΌΠΈ, ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Ρ ΠΎΠΏΡΠΈΠΌΠ°Π»ΡΠ½ΡΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΡΠΎΠ»ΡΠΈΠ½Ρ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ², ΡΡΠ΅ΠΏΠ΅Π½ΠΈ Π½Π°ΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ, ΠΏΡΠΈ ΠΊΠΎΡΠΎΡΡΡ
ΠΎΡΠ»Π°Π±Π»Π΅Π½ΠΈΠ΅ ΡΠ½Π΅ΡΠ³ΠΈΠΈ Π‘ΠΠ§-ΠΈΠ·Π»ΡΡΠ΅Π½ΠΈΡ ΠΌΠ°ΠΊΡΠΈΠΌΠ°Π»ΡΠ½ΠΎ. ΠΡΠ΅Π½Π΅Π½Ρ ΡΠ°Π΄ΠΈΠΎΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠ½ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
Π ΠΠ Π² Π΄ΠΈΠ°ΠΏΠ°Π·ΠΎΠ½Π΅ ΡΠ°ΡΡΠΎΡ 2,0β27,0 ΠΠΡ ΠΏΡΠΈ Π½ΠΎΡΠΌΠ°Π»ΡΠ½ΠΎΠΌ
ΠΏΠ°Π΄Π΅Π½ΠΈΠΈ Π½Π° ΠΎΠ±ΡΠ°Π·Π΅Ρ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΠΎΠΉ Π²ΠΎΠ»Π½Ρ. Π‘ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ΠΌ ΡΠ°ΡΡΡΠΎΠ²ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎΠΉ
ΠΌΠΈΠΊΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈΠ·ΡΡΠ΅Π½Π° ΡΡΡΡΠΊΡΡΡΠ° ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
Π ΠΠ.
ΠΠΎ ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΈ ΡΠ΅Ρ
Π½ΠΈΠΊΠΎ-ΡΠΊΠΎΠ½ΠΎΠΌΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΊΡΠΈΡΠ΅ΡΠΈΡΠΌ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΌΠΈ ΡΡΠ΅Π΄ΡΡΠ²Π°ΠΌΠΈ ΡΠ°Π΄ΠΈΠΎΠ·Π°ΡΠΈΡΡ ΡΠ²Π»ΡΡΡΡΡ Π ΠΠ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΠΎ Π½Π°ΠΏΠΎΠ»Π½Π΅Π½Π½ΡΡ
ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡΠΎΠ². Π ΠΠ ΠΎΡΠ½ΠΎΡΡΡΡΡ ΠΊ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»Π°ΠΌ Π΄Π²ΠΎΠΉΠ½ΠΎΠ³ΠΎ Π½Π°Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΈ ΠΌΠΎΠ³ΡΡ Π±ΡΡΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½Ρ ΠΏΡΠΈ ΡΠΎΠ·Π΄Π°Π½ΠΈΠΈ ΠΌΠ°Π»ΠΎΠ·Π°ΠΌΠ΅ΡΠ½ΡΡ
ΠΎΠ±ΡΠ΅ΠΊΡΠΎΠ², Π² ΡΠΎΠΌ ΡΠΈΡΠ»Π΅ Π»Π΅ΡΠ°ΡΠ΅Π»ΡΠ½ΡΡ
Π°ΠΏΠΏΠ°ΡΠ°ΡΠΎΠ².Radioabsorbing materials and electromagnetic screen based on these materials are one of
the effective means of solving electromagnetic safety and electromagnetic compatibility problems
of radioelectronic equipment. Among the variety of radioabsorbing materials loaded
polyethylene based materials hold their own place.
For composite radioabsorbing materials based on polyethylene including various functional
dispersed fillers and reinforced with conducting textiles optimum thickness values of the
samples are specified and also the levels of filling at which the attenuation of microwave radiation
reaches maximum. Radio physical parameters of polymer composite radioabsorbinhg materials
in the range of frequencies of 2,0β27,0 GHz at normal incidence of electromagnetic
wave on a sample are evaluated. Using raster electronic microscopy the structure of composite
radioabsorbing materials have been studied.
Evaluated by technological and technical-economic parameters the most promising means
of radioprotection are radioabsorbing materials based on functionally loaded thermoplastic materials.
Radioabsorbing materials are referred to as double-purpose materials and can be used for
making barely visible objects such as flying apparatuses
Comparison of Treatment Adherence between Selective Serotonin Reuptake Inhibitors and Moclobemide in Patients with Social Anxiety Disorder
Spatial and Temporal Variation in PBL Height over the Korean Peninsula in the KMA Operational Regional Model
Spatial and temporal variations in planetary boundary layer height (PBLH) over the Korean Peninsula and its surrounding oceans are investigated using a regional grid model operated at the Korea Meteorological Administration (KMA). Special attention is placed on daily maximum mixing height for evaluation against two radiosonde observation datasets. In order to construct a new high-resolution PBLH database with 3-hour time and 10βkm spatial resolution, short-term integrations with the regional model are carried out for a one-year period from June 2010 to May 2011. The resulting dataset is then utilized to explore the seasonal patterns of horizontal PBLH distribution over the peninsula for one year. Frequency distributions as well as monthly and diurnal variations of PBLH at two selected locations are examined. This study reveals specific spatiotemporal structure of boundary layer depth over the Korean Peninsula for the first time at a relatively high-resolution scale. The results are expected to provide insights into the direction for operational tuning and future development in the model boundary layer schemes at KMA
Vapor-Deposited Tungsten Carbide Nano-Dendrites as Sulfur-Tolerant Electrocatalysts for Quantum Dot-Sensitized Solar Cells
Recent advances in optoelectronic properties of quantum dots (QDs) have led to significant improvement in QD-sensitized solar cells (QDSCs); however, for practical utilization of these devices, performance of the constituent electrocatalytic counter electrodes (CEs) needs to be further enhanced. Pt CEs are prone to severe sulfur poisoning by polysulfide redox electrolytes in QDSCs, and Cu2S CEs with state-of-the-art activity are vulnerable to light-induced degradations. In this study, for the first time, tungsten carbide (W2C) films were used as CEs for QDSCs. Instead of the conventional methods of carbide nanomaterial synthesis that involve thermal treatments in toxic/explosive atmospheres, room-temperature vapor deposition was employed for the preparation of W2C electrodes, and dendritic nanostructures with large surface areas were obtained. Although the electronic structures of Pt and W2C are highly similar, W2C was completely inert to sulfur poisoning. This led to a substantial improvement in the electrocatalytic performance for polysulfide reduction, and similar to 27% enhancement in power conversion efficiency was achieved when Pt CEs were replaced with W2C CEs in QDSCs. Moreover, QDSCs comprising W2C CEs manifested excellent photostability, and they showed performances superior to those of QDSCs comprising state-of-the-art Cu2S electrodes within 40 min of operation, without any sign of drop in efficiency. (C) 2018 The Electrochemical Societ
Influence of TiO2 Particle Size on Dye-Sensitized Solar Cells Employing an Organic Sensitizer and a Cobalt(III/II) Redox Electrolyte
Dye-sensitized solar cells (DSSCs) are highly efficient and reliable photovoltaic devices that are based on nanostructured semiconductor photoelectrodes. From their inception in 1991, colloidal TiO2 nanoparticles (NPs) with the large surface area have manifested the highest performances and the particle size of around 20 nm is generally regarded as the optimized condition. However, though there have been reports on the influences of particle sizes in conventional DSSCs employing iodide redox electrolyte, the size effects in DSSCs with the state-of-the-art cobalt electrolyte have not been investigated. In this research, systematic analyses on DSSCs with cobalt electrolytes are carried out by using various sizes of NPs (20-30 nm), and the highest performance is obtained in the case of 30 nm sized TiO2 NPs, indicating that there is a reversed power conversion efficiency trend when compared with those with the iodide counterpart. Detailed investigations on various factors - light harvesting, charge injection, dye regeneration, and charge collection - reveal that TiO2 particles with a size range of 20-30 nm do not have a notable difference in charge injection, dye regeneration, and even in light-harvesting efficiency. It is experimentally verified that the superior charge collection property is the sole origin of the higher performance, suggesting that charge collection should be prioritized for designing nanostructured TiO2 photoelectrodes for DSSCs employing cobalt redox electrolytes. Β© 2018 American Chemical Societ
Electrochemically synthesized nanostructured iron carbide/carbon composite as a low-cost counter electrode for dye-sensitized solar cells
Owing to the rapid increase in global energy consumption, which is currently based on fossil fuel combustion, the importance of renewable energy has become increasingly apparent. Solar energy is one of the most promising candidates to replace conventional energy sources, and various types of photovoltaic devices, including dye-sensitized solar cells, are being intensively investigated as a means for the efficient utilization of sunlight. However, the use of Pt in the counter electrodes of dye-sensitized solar cells limits their economic feasibility for practical and industrial applications. In the present study, to develop an active and economical material to replace Pt in dye-sensitized solar cells, we prepare a nanostructured iron carbide/carbon composite by electrochemical anodization of Fe foil followed by heat treatment in carbon-bearing gas atmosphere, which lead to the formation of conformal carbon shell on the surface of crystalline Fe3C. The superior catalytic properties of the iron carbide/carbon composite in the cobalt bipyridine redox electrolyte to those of Pt are confirmed by various electrochemical characterization methods. When used as the counter electrode in a dye-sensitized solar cell, the superior properties of the composite provide an 8.0% increase in power conversion efficiency compared to that achieved with a Pt counter electrode. Β© 2018 Elsevier B.
Structural and Single-Molecule Studies on the Assembly Mechanism of Histone H3-H4 by Fission Yeast AAA+ATPase Abo1
Chromatin dynamics including nucleosome assembly and disassembly are crucial for genome maintenance, conservation of epigenetic information, and diverse DNA metabolic reactions. Sometimes, the nucleosome assembly or disassembly can be carried out via ATP-dependent pathway by ATPases. Human ATAD2 and its orthologs are bromodomain-containing AAA+ ATPases. ATAD2 and its budding yeast ortholog Yta7 are known to reduce nucleosome density to facilitate gene expression. Meanwhile, it was recently proposed that the fission yeast ortholog Abo1 contributes to increases nucleosome density and chromatin organization in vivo. In addition to this opposite biological function, the structure and molecular features of Abo1 remain poorly understood yet. Here we revealed the cryo-EM structures of Abo1. Interestingly, the ADP-bound state of Abo1 displays a symmetric hexameric ring structure, whereas the hexamer takes open spiral structure when it takes ATP. Such structural change of Abo1 according to ATP binding was observed in real time by high-speed AFM. The AFM results demonstrated that Abo1 subunits stochastically hydrolyze ATP. We also characterized the function of Abo1 using single-molecule DNA curtain and photobleaching assays. We manifested that Abo1 does not dislodge H3-H4 from DNA but assembles them onto DNA only when ATP hydrolysis is permitted. Furthermore, we found that assembly mode of H3-H4 by Abo1 is different from that by CAF-1 forming H3-H4 tetramers