Hokkaido Sapporo Kita High School

Selecting k Paths with the Minimum Longest Path Length in the Stochastic Semi-Bandit Setting

Shunsuke Aoki, Atsuyoshi Nakamura

When performing parallel data transmission through a network using multiple paths, it is practically important to minimize the maximum transmission time among the selected paths. This study addresses an online problem in which $k$ paths from an origin vertex to a destination …

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Isolation and global occurrence of nitrogen-fixing Acidobacteriota in soil environments

Hideomi Itoh, Kazumori Mise, Miyu Kuniyasu, Sawa Wasai-Hara et autres

Acidobacteriota, one of the most abundant and ubiquitous bacterial phyla in soils, are well recognized for their role in carbon cycling. In contrast, their roles in soil nitrogen cycling remain largely unexplored, although recent metagenome-assembled genome (MAG) analyses suggest that Acidobacteriota may …

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Development of Tools for Automatic Collection of Vulnerability Information

Ryota Saeki, Sorito Kohashi, Atsushi Koizumi, Hiroshi Oguma et autres

In recent years, cyberattacks have become increasingly sophisticated, particularly in the reconnaissance phase where attackers gather detailed information to identify and exploit vulnerabilities. This study presents an automated vulnerability information collection tool that integrates multiple external resources—Censys, Maltego, gobuster, and the National …

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The Effect of Single Leg Romanian Deadlift on the Risk of Hamstring Strain Injuries in Track and Field Athletes: A Cohort Study

Ryo Otani, Hideo Nishikawa, Yosuke Hiroshige, Masatoshi Nakamura

Background and Purpose: Hamstring strain injury (HSI) is a particularly significant problem in track and field events. In recent years, it has been recommended that the Nordic hamstring exercise (NHE) be included as part of an HSI prevention program, along with warm-up. …

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Association between confirmed COVID-19 cases at hospitals and SARS-CoV-2 levels in municipal wastewater during the pandemic and endemic phases

Keisuke Kagami, Masaaki Kitajima, Toshihiro Hamada, Yasunobu Kobayashi et autres

COVID-19 is now considered endemic in many countries. On May 8, 2023, Japan reclassified COVID-19 from a pandemic to an endemic status, shifting surveillance from universal to sentinel reporting and transitioning the testing and treatment cost of COVID-19 from public funding to …

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Near-Neutral pH Sensing by Azoheteroarene Dyes

P. K. Hashim, Shifa Ahmad, Nusaiba Madappuram Cheruthu, Saugata Sahu et autres

We serendipitously discovered a novel series of azoheteroarene dyes capable of detecting pH variations in near-neutral solutions. These dyes feature thiazole, thiadiazole, triazole, pyrazole, or benzothiazole heteroaryls linked to hydroxyphenyl azo groups. They exhibit distinctive light absorption properties in aqueous solutions and …

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Large deflection analysis of an axially functionally graded hollow tapered beam under a uniformly distributed load

Carol Lee Chalermsin, Motohiro Sato

Abstract Functionally graded materials (FGMs) have various mechanical advantages and are naturally occurring, such as bamboo. Although bamboo is hollow and tapered, it remains resilient under a wind load. Based on this mechanical rationale, this study focuses on a large deflection of …

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Analysis of interference of electromagnetic noise in an electric compressor for vehicle air‐conditioning systems with an integrated mechanical and electrical structure

Iori Uda, Satoshi Ogasawara, Koji Orikawa, Koji Kobayashi et autres

Abstract Since a motor drive system contains an inverter (high‐voltage circuit) and gate drive circuits (low‐voltage circit) with a switching regulator, electromagnetic noise is generated in each of these two circuits, and noise interference between these circuits can occur. This paper discusses …

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Asymmetric Kernel Density Estimation for Biased Data

Yoshihide Kakizawa

Nonparametric density estimation for nonnegative data is considered in a situation where a random sample is not directly available but the data are instead observed from the length-biased sampling. Due to the boundary bias problem of the location-scale kernel, the approach in …

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Maximal surfaces in the Lorentzian Heisenberg group

David Brander, Shimpei Kobayashi

The 3-dimensional Heisenberg group can be equipped with three different types of left-invariant Lorentzian metric, according to whether the center of the Lie algebra is spacelike, timelike or null. Using the second of these types, we study spacelike surfaces of mean curvature …

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Correlation between antibiotic use and antibiotic resistance: A multicenter study using the Japan Surveillance for Infection Prevention and Healthcare Epidemiology (J-SIPHE) system in Hokkaido, Japan

Keisuke Kagami, Nobuhisa Ishiguro, Sumio Iwasaki, Takayuki Usami et autres

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Novel insight into the correlation between hernia orifice of cystocele and lower urinary tract function: a pilot study

Takeya Kitta, Hirokazu Abe, Ting-Wen Huang, Masahiro Fujikawa et autres

BACKGROUND: It has been hypothesized that women with significant pelvic organ prolapse (POP), particularly of the anterior vaginal wall, may have voiding dysfunction (VD). Although the VD mechanism due to cystocele is not fully understood, different vaginal compartments have rarely been closely …

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