Kyocera (Japan)

Recently, food recognition technology is expected to be more widely used, such as in real-time telemedicine dietary monitoring and post-checkout systems used in canteens.For these purposes, perception recognition of dietary intake becomes more fundamental and important than meal recognition itself.Recent research has shown that computer vision technology can help automatically recognize diverse foods and estimate the amount of food intake.However, training models requires a large amount of data in order to recognize various leftovers, and improving performance while reducing data collection and labelling costs is quite a big challenge.This paper proposes a deep-learning-based food and leftover quantity recognition system with designed system architecture, data augmentation approach and semi-supervised learning approach, which achieves high performance even with a small amount of labeled data.The recognition performance of dish, food and leftover classes with our own evaluate data sets is higher than 0.97.The proposed system can be applied to canteen self-checkout or calorie monitoring.

Daytime napping improves performance, which is maximized with a post-N2 9-min nap. We evaluated whether a system that enables optimal-time automatic awakening using blood flow parameters could improve performance, sleepiness, and fatigue compared to no-nap. Additionally, we investigated whether its performance was comparable to manual awakening based on polysomnography. Eighty-one healthy adults (33.6 ± 12.8 years) were randomly assigned to automatic- or manual-awakening or rest groups. A task bout comprising a digit-symbol substitution test (DSST), visual detection test, and sleepiness and fatigue questionnaires was performed three times per session before napping and for six sessions after napping. In all post-nap sessions, sleepiness and fatigue in the automatic awakening group decreased, compared to the rest group, and were comparable to those in the manual awakening group. The DSST improved in the sixth post-nap session for the manual awakening group compared to the rest group; no improvement was observed in the automatic awakening group. The system model was refined by adding training data and tested on 50 healthy adults (40.6 ± 13.1 years). The test results revealed that the N2 detection accuracy of the system improved. The optimal automatic awakening system improves subjective sleepiness and fatigue, and further improvements in its accuracy may enhance post-nap performance.Supplementary InformationThe online version contains supplementary material available at 10.1038/s41598-025-21008-3.

Miniaturization and loss reduction of surface acoustic wave (SAW) devices are critical challenges for RF modules in next-generation smartphones. In this paper, we propose a novel ultra-compact/low-loss SAW (UCLL-SAW) resonator structure featuring a reflector-less structure based on thin-film SAW (TF-SAW) technology. By forming end-faces for acoustic energy confinement and optimizing the interdigital transducer (IDT) design, we have realized a compact duplexer (DPX) with dimensions of 1.4 mm × 1.1 mm that achieves low insertion loss, high isolation, and excellent temperature stability. The proposed structure is applicable to both middle- and high-frequency bands. Furthermore, it suppresses reflector-induced spurious responses, thereby improving the performance of multiplexers for carrier aggregation. These advantages are expected to contribute to further innovation in RF systems.

ABSTRACT The isolation characteristics between the antennas of transmission and reception are important for signal quality. In this paper, we propose a small dual‐polarized antenna with dual vertical split‐ring resonators and differential feeding. This novel antenna is based on artificial magnetic conductors (AMCs) modified to radiate directly. A high isolation characteristic between two ports of over 70 dB was achieved.

Gallium Nitride (GaN) trench Current Aperture Vertical Electron Transistors with wrap-around gate (WG-CAVETs) were demonstrated on GaN substrates. The periodic trench-groove structure enhanced gate control and suppressed gate leakage to ~10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-5</sup> A/cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> up to 40 V gate bias. Reducing the groove spacing (S) increased threshold voltage (V<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">TH</sub>) and improved breakdown voltage. Both normally-on and normally-off WG-CAVETs were realized by varying S. A normally-on device with S = 4 μm achieved a specific on-resistance (R<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON,SP</sub>) of 2.7 mΩ⋅cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and a breakdown voltage of 817 V. Reducing S to 2 μm enabled a normally-off device (VTH = 4.6 V) with I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">on</sub>/I<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</sub> of 1.7×10<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">10</sup>, R<sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ON,SP</sub> of 3.0 mΩ⋅cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup>, and 984 V breakdown. Also, a normally-off multi-finger WG-CAVET (S = 2 μm) delivered 0.87 A, with RON,SP of 3.4 mΩ⋅cm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and a breakdown voltage of 597 V. For comparative analysis, WG-CAVETs were fabricated with a thinner regrown channel, decreasing from 140 nm to 50 nm. Normally-off devices were achieved over a broader range of groove spacings, albeit with a cost of degraded output current and breakdown voltage.

Identification of protein-protein interfaces is necessary for understanding and regulating biological events. Genetic code expansion enables site-specific photo-cross-linking by introducing photo-reactive non-canonical amino acids into proteins at defined positions during translation. This technology is widely used for analyzing protein-protein interactions and is applicable in mammalian cells. However, the identification of the cross-linked region still remains challenging. Our new protocol enables its identification by pre-installing a site-specific cleavage site, an α-hydroxy acid (Nε-allyloxycarbonyl-α-hydroxyl-L-lysine acid, AllocLys-OH), into the target protein. Alkaline treatment cleaves the crosslinked complex at the position of the α-hydroxy acid residue and thus helps to identify which side of the cleavage site, either closer to the N-terminus or C-terminus, the crosslinked site is located on within the target protein. A series of AllocLys-OH introductions narrows down the crosslinked region. This combination of site-specific crosslinking and cleavage promises to be useful for revealing binding interfaces and protein complex geometries. © 2024 Wiley Periodicals LLC. Basic Protocol 1: Search for crosslinkable sites Basic Protocol 2: Site-specific photo-cross-linking/cleavage.

Abstract Fcc‐TixAl1–xN (TiAlN) coatings synthesized via chemical vapor deposition (CVD) reduce cutting tool wear. Although CVD conditions reportedly influence coating quality, no quantitative guidelines are yet available. To quantitatively study the film‐forming mechanism of TiAlN CVD, the gas composition over the surface must be known. Therefore, we developed a gas‐phase elementary reaction model for TiAlN CVD derived from TiCl4/AlCl3/NH3. First, we constructed a novel thermodynamic dataset including molecules that contained both Ti and Al, and calculated the equilibrium composition. Thermal equilibrium calculations in the gas phase showed that the most stable species were AlCl3 and TiCl3 rather than TiCl4. An elementary reaction model was constructed based on the kinetics of the gas‐phase species that were generated. Kinetic analysis revealed that gas‐phase reactions were largely absent under our reactor conditions. The thermal equilibrium calculations indicated that TiCl4 may have given rise to TiCl3. Thus, other reaction pathways of TiCl4 to TiCl3 were explored. We calculated the reaction rate constants of 12 reactions of Ti species and added them to the model, which revealed that TiCl4 decomposed to TiCl3 via TiCl3NH2. Under our conditions, TiCl4 and TiCl3NH2 are the major Ti species and AlCl3 and AlCl2NH2 are the major Al species, which suggests that some of these species may form films. Unlike in the earlier reaction model, NH2 and H radicals were produced, which may have contributed to the surface reactions. For reactors with large Surface/Volume ratio of reactor, the effects of gas‐phase reactions should be considered. Our reaction model enables estimation of the partial pressures of reactor gas species and will therefore aid study of the TiAlN deposition mechanism.