Proactive Received Power Prediction Using Machine Learning and Depth Images for mmWave Networks

This study demonstrates the feasibility of the proactive received power prediction by leveraging spatiotemporal visual sensing information toward the reliable millimeter-wave (mmWave) networks. Since the received power on a mmWave link can attenuate aperiodically due to a human blockage, the long-term series of the future received power cannot be predicted by analyzing the received signals before the blockage occurs. We propose a novel mechanism that predicts a time series of the received power from the next moment to even several hundred milliseconds ahead. The key idea is to leverage the camera imagery and machine learning (ML). The time-sequential images can involve the spatial geometry and the mobility of obstacles representing the mmWave signal propagation. ML is used to build the prediction model from the dataset of sequential images labeled with the received power in several hundred milliseconds ahead of when each image is obtained. The simulation and experimental evaluations using IEEE 802.11ad devices and a depth camera show that the proposed mechanism employing convolutional LSTM predicted a time series of the received power in up to 500 ms ahead at an inference time of less than 3 ms with a root-mean-square error of 3.5 dB

A random model for immune response to virus in fluctuating environments

In this work we study a model for virus dynamics with a random immune response and a random production rate of susceptible cells from cell proliferation. In traditional models for virus dynamics, the rate at which the viruses are cleared by the immune system is constant, and the rate at which susceptible cells are provided is constant or a function depending on the population of all cells. However, the human body in general is never stationary, and thus these rates can barely be constant. Here we assume that the human body is a random environment and models the rates by random processes, which result in a system of random differential equations. We then analyze the long term behavior of the random system, in particular the existence and geometric structure of the random attractor, by using the theory of random dynamical systems. Numerical simulations are provided to illustrate the theoretical result.National Natural Science Foundation of ChinaMinisterio de Economía y CompetitividadConsejería de Innovación, Ciencia y Empresa (Junta de Andalucía

外側環軸関節の関節症性変化のリスク増加に関連する要因; 後ろ向き研究

Purpose Atlantodens osteoarthritis and atlantoaxial osteoarthritis cause neck pain and suboccipital headaches. Currently, knowledge on the risk factors for atlantoaxial osteoarthritis is lacking. This study aimed to investigate the factors related to the increased risk of atlantoaxial osteoarthritis. Methods We analyzed computed tomography (CT) images of the upper cervical spine of 1266 adult trauma patients for whom upper cervical spine CT was performed at our hospital between 2014 and 2019. The degree of atlantoaxial osteoarthritis was quantified as none-to-mild (not having osteoarthritis) or moderateto- severe (having osteoarthritis). Risk factors associated with atlantoaxial osteoarthritis were identified using univariate and multivariable logistic regression analyses. Results The study group included 69.4% men, and the overall average age of the study population was 54.9 ± 20.4 years. The following factors were independently and significantly associated with atlantoaxial osteoarthritis in the multivariable logistic regression analysis: age in the sixth decade or older (odds ratio [OR], 20.5; 95% confidence interval [CI], 6.2‒67.2, p < 0.001), having calcific synovitis (OR, 4.9; 95% CI, 2.4‒9.9, p < 0.001), women sex (OR, 3.3; 95% CI, 1.9‒5.7, p = 0.002), and not having atlantodens osteoarthritis (OR, 2.1; 95% CI, 1.2‒3.8, p = 0.014). Conclusion In the multivariable logistic regression analysis, age in the sixth decade or older, calcification of the transverse ligament, being women, and not having atlantodens osteoarthritis were found to be significantly associated with atlantoaxial osteoarthritis. Delayed diagnosis and treatment can be avoided by focusing on these risk factors.博士（医学）・甲第873号・令和5年3月15

プロサッカーリーグにおける得点機会獲得のための攻撃プレーの分析 : パスプレーに着目して

In football it is necessary to score more goals than one’s opponents in order to win the game. One strategy for gaining goals and scoring opportunities is attacking through the gap between an opposing defender (DF) and a midfielder (MF) (the DF-MF gap). However, research on this form of attack has revealed that it is merely more likely to lead to scoring and scoring opportunities than other forms of attack. In the present study, therefore, through a comparison between the Japanese J League (JL) and the German Bundesliga (BL), we examined the features of DF-MF attack play in the JL and BL and differences between them, in order to clarify the challenges in the JL for creating scoring opportunities. We determined the number of passes into the DF-MF gap, the number of passes from players receiving the ball in the DF-MF gap, and the relationship between receiving the ball in the DF-MF gap and the opposing DF. The sample used for analysis was a total of 40 games: 20 in the JL (2015 season) and 20 in the BL (2015/2016 season). For statistical analysis, independent t test and chi-squared test were conducted. In comparison to the BL, the rate of penetration into the DF-MF gap was lower in the JL. In addition, it became clear that in the JL there was a lower proportion of scoring opportunities such as penetration into the PA and shots when penetrating into the DF-MF gap than was the case in the BL. This was considered to be due to the fact that in the JL, the number of balls received in the DF-MF gap in the direction of goal was lower than that in the BL. Furthermore, in the JL, when the ball was received in the DF-MF gap, the proportion of moves defended from the opponent goal side was higher than in the BL, suggesting a problem in how the ball is received. These findings suggest that in the JL it is necessary to increase the opportunity for scoring by making it easier for the ball to advance in a goalward direction by receiving the ball when separated from the opponent DF

サッカーにおける相手ディフェンダーとミッドフィルダーとの間のスペースを利用した攻撃の有効性の検討およびJ リーグとブンデスリーガにおける攻撃様相の比較

One of the most important factors for winning football matches is to score goals. At the field level, one important attack strategy is to use the gap between the opposing defender (DF) and midfielder (MF) (DFMF gap). An attack strategy using the DF-MF gap is one of the challenges of Japanese football, but little research on this strategy has been done and its effectiveness is currently unknown. In the present study, therefore, using notational game performance analysis, we aimed to clarify the effectiveness of attacks using the DF-MF gap, and the characteristics of this strategy in the J League (JL) and the German Bundesliga (BL). The sample consisted of a total of 20 games: 10 in the JL (2015 season) and 10 in the BL (2015/2016 season). For statistical analysis, independent t test and chi-squared tests were conducted. In both the JL and BL, it was observed that for attacks using the DF–MF gap, the frequencies of shots, penalty area intrusions, and scoring were higher than for side attacks, suggesting that attacks using the DF–MF gap were more effective. Furthermore, a lower ratio of attacks using the DF-MF gap was observed in the JL than in the BL. Also, the success rate of play in the DF-MF gap and the occurrence rate of play in a “forward” direction was significantly lower for the JL than for the BL. These observations suggest that the difference between the JL and BL lies in the frequency of attacks using the DF–MF gap and in play within it. One of the challenges for the JL is to increase the frequency of play that carries the ball forward into the DF–MF gap without losing possession, in order to increase the occurrence rate of play in that area, and eventually the success rate of attacks using the DF–MF gap

[技術・研究報告] 小学生向け教育番組の音声に用いられる語彙の予備調査

日本語教育が必要な児童向けの教材作成の基礎データを提供するために，NHK Eテレの小学生向け教育番組の音声を書き起こし，語彙表を試作した．低学年向け17番組計510分，高学年向け19番組計570分を音声認識を利用して書き起こし，その中に現れた単語を有用度指標にもとづいて降順に並べ，語彙表を作成した．得られた語彙表は，先行研究にて作成された書き言葉コーパスに基づく語彙表よりも易しい単語が抽出されており，本研究の方法論の有効性が示された

A quantitative model used to compare within-host SARS-CoV-2, MERS-CoV, and SARS-CoV dynamics provides insights into the pathogenesis and treatment of SARS-CoV-2

The scientific community is focused on developing antiviral therapies to mitigate the impacts of the ongoing novel coronavirus disease 2019 (COVID-19) outbreak. This will be facilitated by improved understanding of viral dynamics within infected hosts. Here, using a mathematical model in combination with published viral load data, we compare within-host viral dynamics of SARS-CoV-2 with analogous dynamics of MERS-CoV and SARS-CoV. Our quantitative analyses using a mathematical model revealed that the within-host reproduction number at symptom onset of SARS-CoV-2 was statistically significantly larger than that of MERS-CoV and similar to that of SARS-CoV. In addition, the time from symptom onset to the viral load peak for SARS-CoV-2 infection was shorter than those of MERS-CoV and SARS-CoV. These findings suggest the difficulty of controlling SARS-CoV-2 infection by antivirals. We further used the viral dynamics model to predict the efficacy of potential antiviral drugs that have different modes of action. The efficacy was measured by the reduction in the viral load area under the curve (AUC). Our results indicate that therapies that block de novo infection or virus production are likely to be effective if and only if initiated before the viral load peak (which appears 2–3 days after symptom onset), but therapies that promote cytotoxicity of infected cells are likely to have effects with less sensitivity to the timing of treatment initiation. Furthermore, combining a therapy that promotes cytotoxicity and one that blocks de novo infection or virus production synergistically reduces the AUC with early treatment. Our unique modeling approach provides insights into the pathogenesis of SARS-CoV-2 and may be useful for development of antiviral therapies

Conceptual Design of Rapid Circular Particle Accelerator Using High-Gradient Resonant Cavities with Fixed Frequency

A new high-energy particle accelerator with static combined type of magnetic field and high-gradient resonant cavities is introduced for muon acceleration up to 300 MeV and proton acceleration up to 400 MeV. The accelerator concept is expected to realize Mpps-class rapid cycling high-energy particle acceleration in circular particle accelerators. Conceptual designs of the circular accelerator are discussed with an emphasis on short lifetime particles. The fundamental concept of particle acceleration and the related practical issues, which should be discussed when designing the accelerators, are described as well

The ASTRO-H X-ray Observatory

The joint JAXA/NASA ASTRO-H mission is the sixth in a series of highly successful X-ray missions initiated by the Institute of Space and Astronautical Science (ISAS). ASTRO-H will investigate the physics of the high-energy universe via a suite of four instruments, covering a very wide energy range, from 0.3 keV to 600 keV. These instruments include a high-resolution, high-throughput spectrometer sensitive over 0.3-2 keV with high spectral resolution of Delta E < 7 eV, enabled by a micro-calorimeter array located in the focal plane of thin-foil X-ray optics; hard X-ray imaging spectrometers covering 5-80 keV, located in the focal plane of multilayer-coated, focusing hard X-ray mirrors; a wide-field imaging spectrometer sensitive over 0.4-12 keV, with an X-ray CCD camera in the focal plane of a soft X-ray telescope; and a non-focusing Compton-camera type soft gamma-ray detector, sensitive in the 40-600 keV band. The simultaneous broad bandpass, coupled with high spectral resolution, will enable the pursuit of a wide variety of important science themes.Comment: 22 pages, 17 figures, Proceedings of the SPIE Astronomical Instrumentation "Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray