2,527 results match your criteria: "Graduate School of Information Science[Affiliation]"

Combining genome assembly with population and functional genomics can provide valuable insights to development and evolution, as well as tools for species management. Here, we present a chromosome-level genome assembly of the common brushtail possum (Trichosurus vulpecula), a model marsupial threatened in parts of their native range in Australia, but also a major introduced pest in New Zealand. Functional genomics reveals post-natal activation of chemosensory and metabolic genes, reflecting unique adaptations to altricial birth and delayed weaning, a hallmark of marsupial development.

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Computational role of sleep in memory reorganization.

Curr Opin Neurobiol

December 2023

Laboratory for Neural Computation and Adaptation, RIKEN Center for Brain Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan; Department of Mathematical Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. Electronic address:

Sleep is considered to play an essential role in memory reorganization. Despite its importance, classical theoretical models did not focus on some sleep characteristics. Here, we review recent theoretical approaches investigating their roles in learning and discuss the possibility that non-rapid eye movement (NREM) sleep selectively consolidates memory, and rapid eye movement (REM) sleep reorganizes the representations of memories.

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Health assessment of rice cultivated and harvested from plasma-irradiated seeds.

Sci Rep

October 2023

Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka, 819-0395, Japan.

Article Synopsis
  • * Mice were fed rice from both types of seeds for 4 weeks to see how it affected their health, but researchers found no negative effects on their organ weights or overall health.
  • * The results show that there are no harmful effects on the rice or on health when eating rice grown from plasma-irradiated seeds, even though the treated rice grew better.
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Electrical Properties of Taste Sensors with Positively Charged Lipid Membranes Composed of Amines and Ammonium Salts.

Sensors (Basel)

September 2023

Research and Development Center for Five-Sense Devices, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Currently, taste sensors utilizing lipid polymer membranes are utilized to assess the taste of food products quantitatively. During this process, it is crucial to identify and quantify basic tastes, e.g.

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Spatiotemporal single-cell tracking analysis in 3D tissues to reveal heterogeneous cellular response to mechanical stimuli.

Sci Adv

October 2023

Department of Mechanical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.

Mechanical stimuli have been recognized as important for tissue maturation, homeostasis and constructing engineered three-dimensional (3D) tissues. However, we know little about the cellular mechanical response in tissues that could be considerably heterogeneous and spatiotemporally dynamic due to the complex structure of tissues. Here, we report a spatiotemporal single-cell tracking analysis of in vitro 3D tissues under mechanical stretch, to reveal the heterogeneous cellular behavior by using a developed stretch and optical live imaging system.

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We investigated the effect of fermentation quality of corn silage on dry matter intake (DMI), milk yield, ruminal fermentation, methane (CH ) emissions, and plasma metabolites in lactating cows. Six lactating Holstein cows were used in a 2 × 2 crossover design with two dietary treatments containing high quality corn silage with lower pH (high group) or low quality corn silage with higher pH (low group). The cows were fed partial mixed ration (PMR containing 50%DM of each corn silage) ad libitum plus 0.

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Improvement of ethanol and 2,3-butanediol production in Saccharomyces cerevisiae by ATP wasting.

Microb Cell Fact

October 2023

Department of Bioinformatics Engineering, Graduate School of Information Science and Technology, Osaka University, 1-5 Yamadaoka, Suita, Osaka, 565-0871, Japan.

Background: "ATP wasting" has been observed in C metabolic flux analyses of Saccharomyces cerevisiae, a yeast strain commonly used to produce ethanol. Some strains of S. cerevisiae, such as the sake strain Kyokai 7, consume approximately two-fold as much ATP as laboratory strains.

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Activity-dependent organization of prefrontal hub-networks for associative learning and signal transformation.

Nat Commun

October 2023

SANKEN (The Institute of Scientific and Industrial Research), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka, 567-0047, Japan.

Article Synopsis
  • Associative learning is essential for adjusting to changes in the environment, and the dorso-medial prefrontal cortex (dmPFC) is believed to play a key role in learning processes, particularly in understanding how it stores and processes information.* -
  • The study developed advanced imaging techniques to observe changes in neural activities in male mouse dmPFC during fear-conditioning, revealing significant reorganization in the neuronal network linked to learned responses.* -
  • Findings indicated that during fear conditioning, neurons that initially respond to unconditioned stimuli became central "hubs" in the network, facilitating the transition from conditioned stimuli to conditioned responses through enhanced connectivity and coactivity.*
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vessel-mimicking models have been spotlighted as a powerful tool for investigating cellular behaviours in vascular development and diseases. However, it is still challenging to create micro-scale tubular tissues while mimicking the structural features of small arteries. Here, we propose a 3D culture model of small vascular tissue using a self-folding graphene-based porous film.

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Frequency-specific modulation of oscillatory activity in the rat auditory cortex by vagus nerve stimulation.

Brain Stimul

November 2023

Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan. Electronic address:

Article Synopsis
  • Vagus nerve stimulation (VNS) enhances auditory processing by strengthening the feedforward pathway and modulating the balance between feedforward (FF) and feedback (FB) pathways in the cortex.
  • Research in Wistar rats showed that VNS increased auditory-evoked potentials and specific oscillatory activities (like gamma and beta power) while decreasing theta power.
  • The effects of VNS on these activities were influenced by cholinergic and noradrenergic systems, suggesting that VNS might use these systems to improve auditory response by boosting the FF pathway and diminishing the FB pathway.
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Non-autistic persons modulate their speech rhythm while talking to autistic individuals.

PLoS One

October 2023

International Research Center for Neurointelligence (WPI-IRCN), UTIAS, The University of Tokyo, Tokyo, Japan.

How non-autistic persons modulate their speech rhythm while talking to autistic (AUT) individuals remains unclear. We investigated two types of phonological characteristics: (1) the frequency power of each prosodic, syllabic, and phonetic rhythm and (2) the dynamic interaction among these rhythms using speech between AUT and neurotypical (NT) individuals. Eight adults diagnosed with AUT (all men; age range, 24-44 years) and eight age-matched non-autistic NT adults (three women, five men; age range, 23-45 years) participated in this study.

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The left-right reversed visual feedback of the hand affects multisensory interaction within peripersonal space.

Atten Percept Psychophys

January 2024

Graduate School of Information Science and Technology, The University of Tokyo, Tokyo, Japan.

The interaction between vision and touch, known as the crossmodal congruency effect, has been extensively investigated in several research studies. Recent studies have revealed that the crossmodal congruency effect involves body representations. However, it is unclear how bodily information (e.

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Illusory self-motion ("vection") has been used to present a sense of movement in virtual reality (VR) and other similar applications. It is crucial in vection research to present a stronger sense of movement. Bone-conducted vibration (BCV) is a small and generally acceptable method for enhancing the sense of movement in VR.

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Offensive language detection has received important attention and plays a crucial role in promoting healthy communication on social platforms, as well as promoting the safe deployment of large language models. Training data is the basis for developing detectors; however, the available offense-related dataset in Chinese is severely limited in terms of data scale and coverage when compared to English resources. This significantly affects the accuracy of Chinese offensive language detectors in practical applications, especially when dealing with hard cases or out-of-domain samples.

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Tailored multi-organ segmentation with model adaptation and ensemble.

Comput Biol Med

November 2023

Graduate School of Information Science and Engineering, Ritsumeikan University, Shiga, 525-8577, Japan.

Multi-organ segmentation, which identifies and separates different organs in medical images, is a fundamental task in medical image analysis. Recently, the immense success of deep learning motivated its wide adoption in multi-organ segmentation tasks. However, due to expensive labor costs and expertise, the availability of multi-organ annotations is usually limited and hence poses a challenge in obtaining sufficient training data for deep learning-based methods.

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Statistical learning starts at an early age and is intimately linked to brain development and the emergence of individuality. Through such a long period of statistical learning, the brain updates and constructs statistical models, with the model's individuality changing based on the type and degree of stimulation received. However, the detailed mechanisms underlying this process are unknown.

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Limitations and Future Aspects of Communication Costs in Federated Learning: A Survey.

Sensors (Basel)

August 2023

Graduate School of Information Science and Technology, Department of Creative Informatics, The University of Tokyo, Tokyo 113-8654, Japan.

Article Synopsis
  • The paper examines communication-efficient federated learning (FL), which enables decentralized machine learning across different locations without sharing raw data.
  • It reviews strategies to improve communication efficiency in FL, including model updates, compression methods, resource management, and client selection.
  • The study also identifies ongoing research challenges and suggests future directions for enhancing communication efficiency in federated learning systems.
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Adolescent idiopathic scoliosis (AIS), the most common pediatric musculoskeletal disorder, causes a three-dimensional spine deformity. Lenke type 5 AIS is defined as a structural thoracolumbar/lumbar curve with nonstructural thoracic curves. Although a rod curvature will affect clinical outcomes, intraoperative contouring of the straight rod depends on the surgeon's knowledge and experience.

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Several environmental chemicals are suspected risk factors for autism spectrum disorder (ASD), including valproic acid (VPA) and pesticides acting on nicotinic acetylcholine receptors (nAChRs), if administered during pregnancy. However, their target processes in fetal neuro-development are unknown. We report that the injection of VPA into the fetus impaired imprinting to an artificial object in neonatal chicks, while a predisposed preference for biological motion (BM) remained intact.

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A light-mediated covalently patterned graphene substrate for graphene-enhanced Raman scattering (GERS).

Chem Commun (Camb)

September 2023

Research Institute for Electronic Science (RIES) and Division of Information Science and Technology, Graduate School of Information Science and Technology, Hokkaido University, N20W10, Sapporo, Hokkaido 001-0020, Japan.

Article Synopsis
  • Researchers introduced covalently patterned graphene using acetic acid as a promising candidate for graphene-enhanced Raman scattering (GERS).
  • Rhodamine 6G molecules in contact with the modified graphene demonstrate a significant enhancement (around 25 times) in Raman signal compared to the unmodified areas at 532 nm excitation.
  • The study also explores how factors such as the thickness of the molecules, the wavelength of excitation, and the types of covalently attached groups affect GERS enhancement.
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Asymmetric quantum decision-making.

Sci Rep

September 2023

Department of Information Physics and Computing, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo, 113-8656, Japan.

Collective decision-making plays a crucial role in information and communication systems. However, decision conflicts among agents often impede the maximization of potential utilities within the system. Quantum processes have shown promise in achieving conflict-free joint decisions between two agents through the entanglement of photons or the quantum interference of orbital angular momentum (OAM).

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We have applied our advanced computational and experimental methodologies to investigate the complex structure and binding mechanism of a modified Wilms' Tumor 1 (mWT1) protein epitope to the understudied Asian-dominant allele HLA-A*24:02 (HLA-A24) in aqueous solution. We have applied our developed multicanonical molecular dynamics (McMD)-based dynamic docking method to analyze the binding pathway and mechanism, which we verified by comparing the highest probability structures from simulation with our experimentally solved x-ray crystal structure. Subsequent path sampling MD simulations elucidated the atomic details of the binding process and indicated that first an encounter complex is formed between the N-terminal's positive charge of the 9-residue mWT1 fragment peptide and a cluster of negative residues on the surface of HLA-A24, with the major histocompatibility complex (MHC) molecule preferring a predominantly closed conformation.

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Comprehensive analysis of the composition of the major phospholipids during the asexual life cycle of the filamentous fungus Aspergillus nidulans.

Biochim Biophys Acta Mol Cell Biol Lipids

October 2023

Department of Biotechnology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan; Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan. Electronic address:

Article Synopsis
  • Filamentous fungi experience notable cellular changes throughout their life cycle, particularly influenced by phospholipid synthesis.
  • Deletion of specific genes related to phospholipid production leads to abnormal fungal growth and differentiation.
  • Lipidomic analysis revealed that phospholipid composition varies dynamically, with certain phospholipids increasing during key developmental stages, highlighting their importance for fungal growth and differentiation.
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Acceleration of Approximate Matrix Multiplications on GPUs.

Entropy (Basel)

July 2023

Department of Information Physics and Computing, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo 113-8656, Japan.

Matrix multiplication is important in various information-processing applications, including the computation of eigenvalues and eigenvectors, and in combinatorial optimization algorithms. Therefore, reducing the computation time of matrix products is essential to speed up scientific and practical calculations. Several approaches have been proposed to speed up this process, including GPUs, fast matrix multiplication libraries, custom hardware, and efficient approximate matrix multiplication (AMM) algorithms.

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Multi-phase computed tomography (CT) images have gained significant popularity in the diagnosis of hepatic disease. There are several challenges in the liver segmentation of multi-phase CT images. (1) Annotation: due to the distinct contrast enhancements observed in different phases (i.

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