24,114 results on '"Maehara A"'
Search Results
152. Development of an epileptic seizure prediction algorithm using R–R intervals with self-attentive autoencoder
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Ode, Rikumo, Fujiwara, Koichi, Miyajima, Miho, Yamakawa, Toshikata, Kano, Manabu, Jin, Kazutaka, Nakasato, Nobukazu, Sawai, Yasuko, Hoshida, Toru, Iwasaki, Masaki, Murata, Yoshiko, Watanabe, Satsuki, Watanabe, Yutaka, Suzuki, Yoko, Inaji, Motoki, Kunii, Naoto, Oshino, Satoru, Khoo, Hui Ming, Kishima, Haruhiko, and Maehara, Taketoshi
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- 2023
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153. Intravascular imaging-guided coronary drug-eluting stent implantation: an updated network meta-analysis
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Stone, Gregg W, Christiansen, Evald H, Ali, Ziad A, Andreasen, Lene N, Maehara, Akiko, Ahmad, Yousif, Landmesser, Ulf, and Holm, Niels R
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- 2024
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154. Off-Label Use of Peripheral Paclitaxel Drug-Coated Balloons in Management of Recurrent Coronary In-Stent Restenosis
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Madhavan, Mahesh V., Hakemi, Emad, Neeranjun, Rishi, Rahim, Hussein M., Nouri, Shayan Nabavi, Flattery, Erin, Prasad, Megha, Collins, Michael B., Karmpaliotis, Dimitri, Ali, Ziad A., Parikh, Sahil A., Vahl, Torsten P., Patel, Amisha, Nazif, Tamim M., Fall, Khady N., Maehara, Akiko, Leon, Martin B., Kirtane, Ajay J., and Moses, Jeffrey W.
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- 2024
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155. Clinical utility and safety of a trapezoid-shaped electrode placement for evaluating the mesio-basal temporal lobe during epilepsy surgery
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Kaneko, Satoshi, Inaji, Motoki, Shimizu, Kazuhide, Orihara, Asumi, Hashimoto Fujimoto, Satoka, and Maehara, Taketoshi
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- 2024
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156. Association between pathological infiltrative tumor growth pattern and prognosis in patients with resected lung squamous cell carcinoma
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Kanno, Chiaki, Kudo, Yujin, Matsubayashi, Jun, Furumoto, Hideyuki, Takahashi, Satoshi, Maehara, Sachio, Hagiwara, Masaru, Kakihana, Masatoshi, Ohira, Tatsuo, Nagao, Toshitaka, and Ikeda, Norihiko
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- 2024
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157. Comprehensive biomechanical and anatomical atherosclerotic plaque metrics predict major adverse cardiovascular events: A new tool for clinical decision making
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Gu, Sophie Z., Ahmed, Mona E., Huang, Yuan, Hakim, Diaa, Maynard, Charles, Cefalo, Nicholas V., Coskun, Ahmet U., Costopoulos, Charis, Maehara, Akiko, Stone, Gregg W., Stone, Peter H., and Bennett, Martin R.
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- 2024
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158. Presence and Relevance of Myocardial Bridge in LAD-PCI of CTO and Non-CTO Lesions
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Yamamoto, Kei, Sugizaki, Yoichiro, Karmpaliotis, Dimitri, Sato, Takao, Matsumura, Mitsuaki, Narui, Shuro, Yamamoto, Myong Hwa, Fall, Khady N., James, Elizabeth I., Glinski, John B., Rabban, Maya L., Prasad, Megha, Ng, Vivian G., Sethi, Sanjum S., Nazif, Tamim M., Parikh, Sahil A., Vahl, Torsten P., Ali, Ziad A., Rabbani, LeRoy E., Collins, Michael B., Leon, Martin B., McEntegart, Margaret, Moses, Jeffrey W., Kirtane, Ajay J., Ochiai, Masahiko, Mintz, Gary S., and Maehara, Akiko
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- 2024
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159. SCAI Expert Consensus Statement on the Management of Calcified Coronary Lesions
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Riley, Robert F., Patel, Mitul P., Abbott, J. Dawn, Bangalore, Sripal, Brilakis, Emanouil S., Croce, Kevin J., Doshi, Darshan, Kaul, Prashant, Kearney, Kathleen E., Kerrigan, Jimmy L., McEntegart, Margaret, Maehara, Akiko, Rymer, Jennifer A., Sutton, Nadia R., and Shah, Binita
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- 2024
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160. Wnt/β-catenin-C-kit axis may play a role in adenoid cystic carcinoma prognostication
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Fujii, Shinsuke, Hasegawa, Kana, Maehara, Takashi, Kurppa, Kari J., Heikinheimo, Kristiina, Warner, Kristy A., Maruyama, Satoshi, Tajiri, Yudai, Nör, Jacques E., Tanuma, Jun-ichi, Kawano, Shintaro, and Kiyoshima, Tamotsu
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- 2024
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161. Long-term efficacy and safety of perampanel as an add-on therapy in patients with epilepsy
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Arai, Yukika, Inaji, Motoki, Shimizu, Kazuhide, Kondo, Shizukoto, Hashimoto-Fujimoto, Satoka, Kiyokawa, Juri, Kawano, Yoshihisa, Yamamoto, Shinji, and Maehara, Taketoshi
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- 2024
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162. Single-cell transcriptomics reveals granzyme K–expressing cytotoxic Tfh cells in tertiary lymphoid structures in IgG4-RD
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Aoyagi, Ryuichi, Maehara, Takashi, Koga, Risako, Munemura, Ryusuke, Tomonaga, Tadashi, Murakami, Yuka, Doi, Atsushi, Yamamoto, Hidetaka, Kiyoshima, Tamotsu, Kawano, Shintaro, and Nakamura, Seiji
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- 2024
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163. Intraoperative Telestration System in Endoscopic Transsphenoidal Surgery Contributes to Improved Surgical Safety and Efficient Surgical Education
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Tanaka, Yoji, Abe, Daisu, Inaji, Motoki, Hara, Shoko, Sakai, Ryosuke, and Maehara, Taketoshi
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- 2024
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164. AIM/CD5L ameliorates autoimmune arthritis by promoting removal of inflammatory DAMPs at the lesions
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Yasuda, Keisuke, Shimodan, Shieri, Maehara, Natsumi, Hirota, Aika, Iijima, Ruka, Nishijima, Akemi, Mori, Haruka, Toyama, Ran, Ito, Atsumi, Yoshikawa, Yuri, Arai, Satoko, and Miyazaki, Toru
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- 2024
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165. Factors influencing delayed referral of oral cancer patients from family dentists to the core hospital
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Watanabe, Momoka, Arakawa, Mariko, Ishikawa, Shigeo, Yusa, Kazuyuki, Hemmi, Tomoharu, Okuyama, Naoki, Kasuya, Satoshi, Sasahara, Nobuyuki, Suzuki, Nagiko, Sekiguchi, Manato, Maehara, Kaori, and Iino, Mitsuyoshi
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- 2024
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166. Abelian Neural Networks
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Abe, Kenshin, Maehara, Takanori, and Sato, Issei
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Computer Science - Machine Learning ,Computer Science - Neural and Evolutionary Computing - Abstract
We study the problem of modeling a binary operation that satisfies some algebraic requirements. We first construct a neural network architecture for Abelian group operations and derive a universal approximation property. Then, we extend it to Abelian semigroup operations using the characterization of associative symmetric polynomials. Both models take advantage of the analytic invertibility of invertible neural networks. For each case, by repeating the binary operations, we can represent a function for multiset input thanks to the algebraic structure. Naturally, our multiset architecture has size-generalization ability, which has not been obtained in existing methods. Further, we present modeling the Abelian group operation itself is useful in a word analogy task. We train our models over fixed word embeddings and demonstrate improved performance over the original word2vec and another naive learning method.
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- 2021
167. Orientals as free weak $\omega$-categories
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Maehara, Yuki
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Mathematics - Category Theory ,18N30, 18N40, 18N50, 18N65 - Abstract
The orientals are the free strict $\omega$-categories on the simplices introduced by Street. The aim of this paper is to show that they are also the free weak $\omega$-categories on the same generating data. More precisely, we exhibit the Street nerves of the orientals as fibrant replacements of the simplices in Verity's model structure for complicial sets., Comment: v2: 24 pages. Major revision. Published version
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- 2021
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168. Eclipsing Binary Populations across the Northern Galactic Plane from the KISOGP survey
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Ren, Fangzhou, de Grijs, Richard, Zhang, Huawei, Deng, Licai, Chen, Xiaodian, Matsunaga, Noriyuki, Liu, Chao, Sun, Weijia, Maehara, Hiroyuki, Ukita, Nobuharu, and Kobayashi, Naoto
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We present a catalog of eclipsing binaries in the northern Galactic Plane from the Kiso Wide-Field Camera Intensive Survey of the Galactic Plane (KISOGP). We visually identified 7055 eclipsing binaries spread across $\sim$330 square degrees, including 4197 W Ursa Majoris/EW-, 1458 $\beta$ Lyrae/EB-, and 1400 Algol/EA-type eclipsing binaries. For all systems, $I$-band light curves were used to obtain accurate system parameters. We derived the distances and extinction values for the EW-type objects from their period--luminosity relation. We also obtained the structure of the thin disk from the distribution of our sample of eclipsing binary systems, combined with those of high-mass star-forming regions and Cepheid tracers. We found that the thin disk is inhomogeneous in number density as a function of Galactic longitude. Using this new set of distance tracers, we constrain the detailed structure of the thin disk. Finally, we report a global parallax zero-point offset of $ \Delta \pi=-42.1\pm1.9\mbox{(stat.)}\pm12.9\mbox{(syst.)}$ $\mu$as between our carefully calibrated EW-type eclipsing binary positions and those provided by Gaia Early Data Release 3. Implementation of the officially recommended parallax zero-point correction results in a significantly reduced offset. Additionally, we provide a photometric characterization of our EW-type eclipsing binaries that can be applied to further analyses., Comment: 17 pages, 9 figures, 2 tables. Accepted for publication in AJ
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- 2021
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169. First Successful Wireline Stress Testing in a Gas Hydrate Reservoir in the Hyuganada Sea, Japan
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Satoshi Ohtsuki, Bei Gao, Takanao Yoshii, Yuki Maehara, Daigoro Watanabe, Takayuki Kanno, and Zhaoya Fan
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gas hydrates ,stress testing ,formation testing ,riserless operation ,Technology - Abstract
This study presents a stress testing operation conducted using a wireline formation tester in a newly discovered gas hydrate prospect located offshore in Japan. The campaign, which spanned from December 2021 to January 2022, involved drilling a well using logging-while-drilling technology. Subsequently, wireline formation testing and stress testing were successfully conducted at three different depths within a gas hydrate-concentrated zone. The testing was accomplished in a single riserless descent, with the primary goal of obtaining crucial data such as mobility, formation pressure, and fracture gradient for one of the prospects. This operation marked the first stress testing job performed with dual packers in an open water and deepwater environment specifically for gas hydrate reservoirs. The study also provides a comprehensive interpretation of the data gathered during the operation. Moreover, it evaluates various properties such as formation mobility, formation pressure, initial breakdown pressure, closure pressure, fracture propagation pressure, and instantaneous shut-in pressure.
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- 2024
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170. r-Gathering Problems on Spiders:Hardness, FPT Algorithms, and PTASes
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Kumabe, Soh and Maehara, Takanori
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Computer Science - Data Structures and Algorithms - Abstract
We consider the min-max $r$-gathering problem described as follows: We are given a set of users and facilities in a metric space. We open some of the facilities and assign each user to an opened facility such that each facility has at least $r$ users. The goal is to minimize the maximum distance between the users and the assigned facility. We also consider the min-max $r$-gather clustering problem, which is a special case of the $r$-gathering problem in which the facilities are located everywhere. In this paper, we study the tractability and the hardness when the underlying metric space is a spider, which answers the open question posed by Ahmed et al. [WALCOM'19]. First, we show that the problems are NP-hard even if the underlying space is a spider. Then, we propose FPT algorithms parameterized by the degree $d$ of the center. This improves the previous algorithms because they are parameterized by both $r$ and $d$. Finally, we propose PTASes to the problems. These are best possible because there are no FPTASes unless P=NP., Comment: This is work is a merger of arXiv:1907.04088 and arXiv:1907.04087
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- 2020
171. Stacked Graph Filter
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NT, Hoang, Maehara, Takanori, and Murata, Tsuyoshi
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Computer Science - Machine Learning - Abstract
We study Graph Convolutional Networks (GCN) from the graph signal processing viewpoint by addressing a difference between learning graph filters with fully connected weights versus trainable polynomial coefficients. We find that by stacking graph filters with learnable polynomial parameters, we can build a highly adaptive and robust vertex classification model. Our treatment here relaxes the low-frequency (or equivalently, high homophily) assumptions in existing vertex classification models, resulting a more ubiquitous solution in terms of spectral properties. Empirically, by using only one hyper-parameter setting, our model achieves strong results on most benchmark datasets across the frequency spectrum., Comment: Source code is provided at github.com/gear/sgf
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- 2020
172. Statistical Properties of Superflares on Solar-type Stars: Results Using All of the Kepler Primary Mission Data
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Okamoto, Soshi, Notsu, Yuta, Maehara, Hiroyuki, Namekata, Kosuke, Honda, Satoshi, Ikuta, Kai, Nogami, Daisaku, and Shibata, Kazunari
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
We report the latest statistical analyses of superflares on solar-type (G-type main-sequence; effective temperature is 5100 - 6000 K) stars using all of the $Kepler$ primary mission data, and $Gaia$-DR2 (Data Release 2) catalog. We updated the flare detection method from our previous studies by using high-pass filter to remove rotational variations caused by starspots. We also examined the sample biases on the frequency of superflares, taking into account gyrochronology and flare detection completeness. The sample size of solar-type stars and Sun-like stars (effective temperature is 5600 - 6000 K and rotation period is over 20 days in solar-type stars) are $\sim$4 and $\sim$12 times, respectively, compared with Notsu et al. (2019, ApJ, 876, 58). As a result, we found 2341 superflares on 265 solar-type stars, and 26 superflares on 15 Sun-like stars: the former increased from 527 to 2341 and the latter from 3 to 26 events compared with our previous study. This enabled us to have a more well-established view on the statistical properties of superflares. The observed upper limit of the flare energy decreases as the rotation period increases in solar-type stars. The frequency of superflares decreases as the stellar rotation period increases. The maximum energy we found on Sun-like stars is $4 \times 10^{34}$ erg. Our analysis of Sun-like stars suggest that the Sun can cause superflares with energies of $\sim 7 \times 10^{33}$ erg ($\sim$X700-class flares) and $\sim 1 \times 10^{34}$ erg ($\sim$X1000-class flares) once every $\sim$3,000 years and $\sim$6,000 years, respectively., Comment: 49 pages, 22 figures, 6 tables, supplementary table, Accepted for publication in The Astrophysical Journal (03-Nov-2020)
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- 2020
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173. Characteristics of a real-time radiation exposure dosimetry system using a synthetic ruby for radiotherapy
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Matsumoto, Kenki, Maruyama, Ayaka, Watanabe, Satoru, Tachibana, Ryousuke, Yamaguchi, Toshiya, Suzuki, Kouki, Kurihara, Yoshiki, Maehara, Masayoshi, Arakawa, Satoshi, and Hosokai, Yoshiyuki
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- 2023
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174. Analysis of “visible in retrospect” to monitor false-negative findings in radiological reports
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Noguchi, Tomoyuki, Yamashita, Koji, Matsuura, Shuji, Kamei, Ryotaro, Maehara, Junki, Furuya, Kiyomi, Harada, Shino, Adachi, Saki, and Okada, Yasushi
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- 2023
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175. Current status and challenges of percutaneous vertebroplasty (PVP)
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Noguchi, Tomoyuki, Yamashita, Koji, Kamei, Ryotaro, and Maehara, Junki
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- 2023
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176. Genome-wide association study of preterm birth and gestational age in a Japanese population
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Keita Hasegawa, Natsuhiko Kumasaka, Kazuhiko Nakabayashi, Hiromi Kamura, Kayoko Maehara, Yoshifumi Kasuga, Kenichiro Hata, and Mamoru Tanaka
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Genetics ,QH426-470 ,Life ,QH501-531 - Abstract
Abstract Preterm birth (PTB), defined as the birth of a baby at
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- 2023
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177. Autoimmune alopecia areata due to thymoma without myasthenia gravis: a case report
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Yukino Saito, Tomohiro Yazawa, Toshiteru Nagashima, Yoichi Ohtaki, Natsuko Kawatani, Eiji Narusawa, Ryohei Yoshikawa, Nozomi Matsumura, Tatsuro Maehara, and Ken Shirabe
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Thymoma ,Alopecia areata ,Surgery ,Autoimmune disease ,RD1-811 - Abstract
Abstract Background Thymoma is associated with autoimmune diseases. Myasthenia gravis is frequently associated with thymoma, but cases of thymoma complicated by alopecia areata are very rare. In this report, we present a case of thymoma associated with alopecia areata, but without Myasthenia gravis. Case presentation A 60-year-old woman had a complaint of rapid progression of alopecia areata. A hair follicular biopsy was performed, which showed the infiltration of CD8-positive lymphocytes. She was prescribed topical steroids for 2 months prior to surgery, but her hair loss was not improved. Screening computed tomography showed a mass in the anterior mediastinum, which was suspected to be a thymoma. Myasthenia gravis was ruled out because she had no relevant symptoms or physical findings, and no anti-acetylcholine receptor antibodies were detected in serum. We performed a transsternal extended thymectomy based on a diagnosis of thymoma Masaoka stage I, without myasthenia gravis. Pathological examination showed Type AB thymoma, Masaoka stage II. The chest drainage tube was removed on postoperative day 1, and the patient was discharged on postoperative day 6. The patient has continued topical steroids and showed improvement 2 months postoperatively. Conclusions Although alopecia areata is a rare complication in thymoma cases without myasthenia gravis, thoracic surgeons need to keep this condition in mind because alopecia reduces the patient's quality of life.
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- 2023
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178. Time-resolved spectroscopy and photometry of an M dwarf flare star YZ Canis Minoris with OISTER and TESS: Blue asymmetry in H$\alpha$ line during the non-white light flare
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Maehara, Hiroyuki, Notsu, Yuta, Namekata, Kousuke, Honda, Satoshi, Kowalski, Adam F., Katoh, Noriyuki, Ohshima, Tomohito, Iida, Kota, Oeda, Motoki, Murata, Katsuhiro L., Yamanaka, Masayuki, Takagi, Kengo, Sasada, Mahito, Akitaya, Hiroshi, Ikuta, Kai, Okamoto, Soshi, Nogami, Daisaku, and Shibata, Kazunari
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Astrophysics - Solar and Stellar Astrophysics - Abstract
In this paper, we present the results from spectroscopic and photometric observations of the M-type flare star YZ CMi in the framework of the Optical and Infrared Synergetic Telescopes for Education and Research (OISTER) collaborations during the Transiting Exoplanet Survey Satellite (TESS) observation period. We detected 145 white-light flares from the TESS light curve and 4 H$\alpha$ flares from the OISTER observations performed between 2019-01-16 and 2019-01-18. Among them, 3 H$\alpha$ flares were associated with white-light flares. However, one of them did not show clear brightening in continuum; during this flare, the H$\alpha$ line exhibited blue-asymmetry which has lasted for $\sim 60$ min. The line of sight velocity of the blue-shifted component is $-80$ - $-100$ km s$^{-1}$. This suggests that there can be upward flows of chromospheric cool plasma even without detectable red/NIR continuum brightening. By assuming that the blue-asymmetry in H$\alpha$ line was caused by a prominence eruption on YZ CMi, we estimated the mass and kinetic energy of the upward-moving material to be $10^{16}$ - $10^{18}$ g and $10^{29.5}$ - $10^{31.5}$ erg, respectively. The estimated mass is comparable to expectations from the empirical relation between the flare X-ray energy and mass of upward-moving material for stellar flares and solar CMEs. In contrast, the estimated kinetic energy for the non-white-light flare on YZ CMi is roughly $2$ orders of magnitude smaller than that expected from the relation between flare X-ray energy and kinetic energy for solar CMEs. This could be understood by the difference in the velocity between CMEs and prominence eruptions., Comment: 39 pages, 15 figures, supplementary table (CSV format); accepted for publication in PASJ
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- 2020
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179. Rank axiom of modular supermatroids: A connection with directional DR submodular functions
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Maehara, Takanori and Nakashima, So
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Mathematics - Combinatorics ,Mathematics - Optimization and Control - Abstract
A matroid has been one of the most important combinatorial structures since it was introduced by Whitney as an abstraction of linear independence. As an important property of a matroid, it can be characterized by several different (but equivalent) axioms, such as the augmentation, the base exchange, or the rank axiom. A supermatroid is a generalization of a matroid defined on lattices. Here, the central question is whether a supermatroid can be characterized by several equivalent axioms similar to a matroid. Barnabei, Nicoletti, and Pezzoli characterized supermatroids on distributive lattices, and Fujishige, Koshevoy, and Sano generalized the results for cg-matroids (supermatroids on lower locally distributive lattices). In this study, we focus on modular lattices, which are an important superclass of distributive lattices, and provide equivalent characterizations of supermatroids on modular lattices. We characterize supermatroids on modular lattices using the rank axiom in which the rank function is a directional DR-submodular function, which is a generalization of a submodular function introduced by the authors. Using a characterization based on rank functions, we further prove the strong exchange property of a supermatroid, which has application in optimization. We also reveal the relation between the axioms of a supermatroid on lower semimodular lattices, which is a common superclass of a lower locally distributive lattice and a modular lattice., Comment: 32pages, 8 figures
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- 2020
180. Relationship between Radar Cross Section and Optical Magnitude based on Radar and Optical Simultaneous Observations of Faint Meteors
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Ohsawa, Ryou, Hirota, Akira, Morita, Kohei, Abe, Shinsuke, Kastinen, Daniel, Kero, Johan, Szasz, Csilla, Fujiwara, Yasunori, Nakamura, Takuji, Nishimura, Koji, Sako, Shigeyuki, Watanabe, Jun-ichi, Aoki, Tsutomu, Arima, Noriaki, Arimatsu, Ko, Doi, Mamoru, Ichiki, Makoto, Ikeda, Shiro, Ita, Yoshifusa, Kasuga, Toshihiro, Kobayashi, Naoto, Kokubo, Mitsuru, Konishi, Masahiro, Maehara, Hiroyuki, Miyata, Takashi, Mori, Yuki, Morii, Mikio, Morokuma, Tomoki, Motohara, Kentaro, Nakada, Yoshikazu, Okumura, Shin-ichiro, Sarugaku, Yuki, Sato, Mikiya, Shigeyama, Toshikazu, Soyano, Takao, Takahashi, Hidenori, Tanaka, Masaomi, Tarusawa, Ken'ichi, Tominaga, Nozomu, Urakawa, Seitaro, Usui, Fumihiko, Yamashita, Takuya, and Yoshikawa, Makoto
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Radar and optical simultaneous observations of meteors are important to understand the size distribution of the interplanetary dust. However, faint meteors detected by high power large aperture radar observations, which are typically as faint as 10 mag. in optical, have not been detected until recently in optical observations, mainly due to insufficient sensitivity of the optical observations. In this paper, two radar and optical simultaneous observations were organized. The first observation was carried out in 2009 to 2010 using Middle and Upper Atmosphere Radar (MU radar) and an image-intensified CCD camera. The second observation was carried out in 2018 using the MU radar and a mosaic CMOS camera, Tomo-e Gozen, mounted on the 1.05-m Kiso Schmidt Telescope. In total, 331 simultaneous meteors were detected. The relationship between radar cross sections and optical V-band magnitudes was well approximated by a linear function. A transformation function from the radar cross section to the V-band magnitude was derived for sporadic meteors. The transformation function was applied to about 150,000 meteors detected by the MU radar in 2009--2015, large part of which are sporadic, and a luminosity function was derived in the magnitude range of $-1.5$ to $9.5$ mag. The luminosity function was well approximated by a single power-law function with the population index of $r = 3.52{\pm}0.12$. The present observation indicates that the MU radar has capability to detect interplanetary dust of $10^{-5}$ to $10^{0}$ g in mass as meteors., Comment: Accepted for publication in Planetary & Space Science. 20 pages, 8 figures
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- 2020
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181. Starspot mapping with adaptive parallel tempering I: Implementation of computational code
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Ikuta, Kai, Maehara, Hiroyuki, Notsu, Yuta, Namekata, Kosuke, Kato, Taichi, Notsu, Shota, Okamoto, Soshi, Honda, Satoshi, Nogami, Daisaku, and Shibata, Kazunari
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Starspots are thought to be regions of locally strong magnetic fields, similar to sunspots, and they can generate photometric brightness modulations. To deduce stellar and spot properties, such as spot emergence and decay rates, we implement computational code for starspot modeling. It is implemented with an adaptive parallel tempering algorithm and an importance sampling algorithm for parameter estimation and model selection in the Bayesian framework. For evaluating the performance of the code, we apply it to synthetic light curves produced with 3 spots. The light curves are specified in the spot parameters, such as the radii, intensities, latitudes, longitudes, and emergence/decay durations. The spots are circular with specified radii and intensities relative to the photosphere, and the stellar differential rotation coefficient is also included in the light curves. As a result, stellar and spot parameters are uniquely deduced. The number of spots is correctly determined: the 3-spot model is preferable because the model evidence is much greater than that of 2-spot models by orders of magnitude and more than that of 4-spot model by a more modest factor, whereas the light curves are produced to have 2 or 1 local minimum during one equatorial rotation period by adjusting the values of longitude. The spot emergence and decay rates can be estimated with error less than an order of magnitude, considering the difference of the number of spots., Comment: 27 pages, 14 figures, 2 tables, accepted for publication in ApJ
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- 2020
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182. A cubical model for $(\infty, n)$-categories
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Campion, Tim, Kapulkin, Chris, and Maehara, Yuki
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Mathematics - Algebraic Topology ,Mathematics - Category Theory ,Primary: 55U35, Secondary: 18G55, 55U40 - Abstract
We propose a new model for the theory of $(\infty,n)$-categories (including the case $n=\infty$) in the category of marked cubical sets with connections, similar in flavor to complicial sets of Verity. The model structure characterizing our model is shown to be monoidal with respect to suitably defined (lax and pseudo) Gray tensor products; in particular, these tensor products are both associative and biclosed. Furthermore, we show that the triangulation functor to pre-complicial sets is a left Quillen functor and is strong monoidal with respect to both Gray tensor products., Comment: submitted; 38 pages; v2 minor revisions
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- 2020
183. Optical and X-ray observations of stellar flares on an active M dwarf AD Leonis with Seimei Telescope, SCAT, NICER and OISTER
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Namekata, Kosuke, Maehara, Hiroyuki, Sasaki, Ryo, Kawai, Hiroki, Notsu, Yuta, Kowalski, Adam F., Allred, Joel C., Iwakiri, Wataru, Tsuboi, Yohko, Murata, Katsuhiro L., Niwano, Masafumi, Shiraishi, Kazuki, Adachi, Ryo, Iida, Kota, Oeda, Motoki, Honda, Satoshi, Tozuka, Miyako, Katoh, Noriyuki, Onozato, Hiroki, Okamoto, Soshi, Isogai, Keisuke, Kimura, Mariko, Kojiguchi, Naoto, Wakamatsu, Yasuyuki, Tampo, Yusuke, Nogami, Daisaku, and Shibata, Kazunari
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We report multi-wavelength monitoring observations of an M-dwarf flare star AD Leonis with Seimei Telescope (6150--7930 {\AA}), SCAT (Spectroscopic Chuo-university Astronomical Telescope; 3700--7500 {\AA}), NICER (Neutron Star Interior Composition Explorer; 0.2--12.0 keV), and collaborations of OISTER (Optical and Infrared Synergetic Telescopes for Education and Research) program. Twelve flares are detected in total which include ten H$\alpha$, four X-ray, and four optical-continuum flares; one of them is a superflare with the total energy of $\sim$ 2.0$\times$10$^{33}$ erg. We found that (1) during the superflare, the H$\alpha$ emission line full width at 1/8 maximum dramatically increases to 14 {\AA} from 8 {\AA} in the low-resolution spectra (R$\sim$ 2000) accompanied with the large white-light flares, (2) some weak H$\alpha$/X-ray flares are not accompanied with white-light emissions, and (3) the non-flaring emissions show clear rotational modulations in X-ray and H$\alpha$ intensity in the same phase. To understand these observational features, one-dimensional hydrodynamic flare simulations are performed by using the RADYN code. As a result of simulations, we found the simulated H$\alpha$ line profiles with hard and high-energy non-thermal electron beams are consistent with that of the initial phase line profiles of the superflares, while those with more soft- and/or weak-energy beam are consistent with those in decay phases, indicating the changes in the energy fluxes injected to the lower atmosphere. Also, we found that the relation between optical continuum and H$\alpha$ intensity is nonlinear, which can be one cause of the non-white-light flares. The flare energy budget exhibits diversity in the observations and models, and more observations of stellar flares are necessary for constraining the occurrence of various emission line phenomena in stellar flares., Comment: 18 pages, 17 figures, Accepted for Publication in PASJ
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- 2020
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184. Calcium-rich Transient SN 2019ehk in A Star-Forming Environment: Yet Another Candidate for An Ultra-Stripped Envelope Supernova
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Nakaoka, Tatsuya, Maeda, Keiichi, Yamanaka, Masayuki, Tanaka, Masaomi, Kawabata, Miho, Moriya, Takashi J., Kawabata, Koji S., Tominaga, Nozomu, Takagi, Kengo, Imazato, Fumiya, Morokuma, Tomoki, Sako, Shigeyuki, Ohsawa, Ryou, Nagao, Takashi, Jiang, Ji-an, Burgaz, Umut, Taguchi, Kenta, Uemura, Makoto, Akitaya, Hiroshi, Sasada, Mahito, Isogai, Keisuke, Otsuka, Masaaki, and Maehara, Hiroyuki
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present optical and near-infrared observations of SN~Ib~2019ehk. We show that it evolved to a Ca-rich transient according to its spectral properties and evolution in late phases. It, however, shows a few distinguishable properties from the canonical Ca-rich transients: a short-duration first peak in the light curve, high peak luminosity, and association with a star-forming environment. Indeed, some of these features are shared with iPTF14gqr and iPTF16hgs, which are candidates for a special class of core-collapse SNe (CCSNe): the so-called ultra-stripped envelope SNe, i.e., a relatively low-mass He (or C+O) star explosion in a binary as a precursor of double neutron star binaries. The estimated ejecta mass ($0.43 M_\odot$) and explosion energy ($1.7 \times 10^{50} $~erg) are consistent with this scenario. The analysis of the first peak suggests existence of dense circumstellar material in the vicinity of the progenitor, implying a CCSN origin. Based on these analyses, we suggest SN 2019ehk is another candidate for an ultra-stripped envelope SN. These ultra-stripped envelope SN candidates seem to form a subpopulation among Ca-rich transients, associated with young population. We propose that the key to distinguishing this population is the early first peak in their light curves., Comment: submitted to ApJ on Mar 27, 2020
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- 2020
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185. Graph Homomorphism Convolution
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NT, Hoang and Maehara, Takanori
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Computer Science - Machine Learning ,Computer Science - Discrete Mathematics ,Mathematics - Combinatorics ,Statistics - Machine Learning - Abstract
In this paper, we study the graph classification problem from the graph homomorphism perspective. We consider the homomorphisms from $F$ to $G$, where $G$ is a graph of interest (e.g. molecules or social networks) and $F$ belongs to some family of graphs (e.g. paths or non-isomorphic trees). We show that graph homomorphism numbers provide a natural invariant (isomorphism invariant and $\mathcal{F}$-invariant) embedding maps which can be used for graph classification. Viewing the expressive power of a graph classifier by the $\mathcal{F}$-indistinguishable concept, we prove the universality property of graph homomorphism vectors in approximating $\mathcal{F}$-invariant functions. In practice, by choosing $\mathcal{F}$ whose elements have bounded tree-width, we show that the homomorphism method is efficient compared with other methods., Comment: 37th International Conference on Machine Learning (ICML 2020)
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- 2020
186. Cost estimation for alternative aviation plans against potential radiation exposure associated with solar proton events for the airline industry
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Yamashiki, Yosuke A., Fujita, Moe, Sato, Tatsuhiko, Maehara, Hiroyuki, Notsu, Yuta, and Shibata, Kazunari
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Economics - General Economics ,Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Solar and Stellar Astrophysics ,Physics - Space Physics - Abstract
We present a systematic approach to effectively evaluate potential risk cost caused by exposure to solar proton events (SPEs) from solar flares for the airline industry. We also evaluate associated health risks from radiation, to provide relevant alternative ways to minimize economic loss and opportunity. The estimated radiation dose induced by each SPE for the passengers of each flight is calculated using ExoKyoto and PHITS. We determine a few scenarios for the estimated dose limit at 1 and 20mSv, corresponding to the effective dose limit for the general public and occupational exposure, respectively, as well as a higher dose induced an extreme superflare. We set a hypothetical airline shutdown scenario at 1mSv for a single flight per passenger, due to legal restrictions under the potential radiation dose. In such a scenario, we calculate the potential loss in direct and opportunity cost under the cancelation of the flight. At the same time, we considered that, even under such a scenario, if the airplane flies at a slightly lower altitude (from 12 to 9.5km: atmospheric depth from 234 to 365g/cm$^{2}$), the total loss becomes much smaller than flight cancelation, and the estimated total dose goes down from 1.2 to 0.45mSv, which is below the effective dose limit for the general public. In case of flying at an even lower altitude (7km: atmospheric depth 484g/cm$^{2}$), the estimated total dose becomes much smaller, 0.12 mSv. If we assume the increase of fuel cost is proportional to the increase in atmospheric depth, the increase in cost becomes 1.56 and 2.07 for the case of flying at 9.5 km and at 7 km, respectively. Lower altitude flights provide more safety for the potential risk of radiation doses induced by severe SPEs. At the same time, since there is total loss caused by flight cancelation, we propose that considering lower flight altitude is the best protection against solar flares., Comment: 16 pages, 3 figures, published in Evolutionary and Institutional Economics Review, 2020 (The accepted version of the manuscript is uploaded in arXiv. The final published version is available in the journal website.)
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- 2020
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187. The Gray tensor product for 2-quasi-categories
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Maehara, Yuki
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Mathematics - Category Theory ,Mathematics - Algebraic Topology ,18D05, 18D99, 18G55, 55U35, 55U40 - Abstract
We construct an $(\infty,2)$-version of the (lax) Gray tensor product. On the 1-categorical level, this is a binary (or more generally an $n$-ary) functor on the category of $\Theta_2$-sets, and it is shown to be left Quillen with respect to Ara's model structure. Moreover we prove that this tensor product forms part of a "homotopical" (biclosed) monoidal structure, or more precisely a normal lax monoidal structure that is associative up to homotopy., Comment: v3: 63 pages. Minor revision. Published version
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- 2020
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188. Tightly Robust Optimization via Empirical Domain Reduction
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Yabe, Akihiro and Maehara, Takanori
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Mathematics - Optimization and Control ,Computer Science - Machine Learning ,Statistics - Machine Learning - Abstract
Data-driven decision-making is performed by solving a parameterized optimization problem, and the optimal decision is given by an optimal solution for unknown true parameters. We often need a solution that satisfies true constraints even though these are unknown. Robust optimization is employed to obtain such a solution, where the uncertainty of the parameter is represented by an ellipsoid, and the scale of robustness is controlled by a coefficient. In this study, we propose an algorithm to determine the scale such that the solution has a good objective value and satisfies the true constraints with a given confidence probability. Under some regularity conditions, the scale obtained by our algorithm is asymptotically $O(1/\sqrt{n})$, whereas the scale obtained by a standard approach is $O(\sqrt{d/n})$. This means that our algorithm is less affected by the dimensionality of the parameters.
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- 2020
189. Learning Directly from Grammar Compressed Text
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Sasaki, Yoichi, Akimoto, Kosuke, and Maehara, Takanori
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Statistics - Machine Learning ,Computer Science - Computation and Language ,Computer Science - Machine Learning - Abstract
Neural networks using numerous text data have been successfully applied to a variety of tasks. While massive text data is usually compressed using techniques such as grammar compression, almost all of the previous machine learning methods assume already decompressed sequence data as their input. In this paper, we propose a method to directly apply neural sequence models to text data compressed with grammar compression algorithms without decompression. To encode the unique symbols that appear in compression rules, we introduce composer modules to incrementally encode the symbols into vector representations. Through experiments on real datasets, we empirically showed that the proposal model can achieve both memory and computational efficiency while maintaining moderate performance., Comment: 12 pages, 4 Postscript figures
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- 2020
190. Temporal Evolution of Spatially-Resolved Individual Star Spots on a Planet-Hosting Solar-type Star: Kepler 17
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Namekata, Kosuke, Davenport, James R. A., Morris, Brett M., Hawley, Suzanne L., Maehara, Hiroyuki, Notsu, Yuta, Toriumi, Shin, Ikuta, Kai, Notsu, Shota, Honda, Satoshi, Nogami, Daisaku, and Shibata, Kazunari
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
Star spot evolution is visible evidence of the emergence/decay of the magnetic field on stellar surface, and it is therefore important for the understanding of the underlying stellar dynamo and consequential stellar flares. In this paper, we report the temporal evolution of individual star spot area on the hot-Jupiter-hosting active solar-type star Kepler 17 whose transits occur every 1.5 days. The spot longitude and area evolution are estimated (1) from the stellar rotational modulations of Kepler data and (2) from the brightness enhancements during the exoplanet transits caused by existence of large star spots. As a result of the comparison, number of spots, spot locations, and the temporal evolution derived from the rotational modulations is largely different from those of in-transit spots. We confirm that although only two light curve minima appear per rotation, there are clearly many spots present on the star. We find that the observed differential intensity changes are sometimes consistent with the spot pattern detected by transits, but they sometimes do not match with each other. Although the temporal evolution derived from the rotational modulation differs from those of in-transit spots to a certain degree, the emergence/decay rates of in-transit spots are within an order of magnitude of those derived for sunspots as well as our previous research based only on rotational modulations. This supports a hypothesis that the emergence/decay of sunspots and extremely-large star spots on solar-type stars occur through the same underlying processes., Comment: 37 pages, 12 figures, 1 table. Accepted for publication in The Astrophysical Journal
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- 2020
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191. ARCAD-Asia initiative: leveraging yesterday’s data for tomorrow
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Y. Takeda, T. Misumi, H. Bando, M. Suzuki, M. Wakabayashi, E. Oki, K. Yamazaki, Y. Kakeji, K. Shitara, M. Terashima, M. Raeisi, Y. Maehara, A. Ohtsu, T. Andre, A. de Gramont, Q. Shi, and T. Yoshino
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integrated database ,data sharing ,clinical study data ,no placebo initiative ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Background: In clinical oncology, it is widely recognized that data sharing and the integration of completed clinical trials can promote research and development (R&D). The Foundation Aide et Recherche en Cancérologie Digestive (ARCAD) database project was initiated in Europe and the United States in 2006. Approximately 40 000 individual patient data (IPD) for metastatic colorectal cancer were collected and constructed as an integrated database. Materials and methods: ARCAD-Asia was launched in 2021 and has been actively collecting Asian clinical trials. In addition, ARCAD-Asian data were periodically transferred to the Mayo Clinic, and IPD was integrated into the ARCAD database. Finally, all data were shared with three data centers, ARCAD-Asia and ARCAD, located in Europe, the United States, and Japan. We have developed a reproducible and reliable data conversion procedure based on the methodology established by ARCAD. Results: From September 2021 to April 2023, 2318 IPD from four first-line, two second-line, and three third-line trials for metastatic colorectal cancer were integrated and stored in ARCAD-Asia. By autumn 2023, three more trials (1565 IPD) will be included, resulting in 12 trials (3883 IPD) in the Asia database. These are transferred and shared with ARCAD. After integrating Asian data, the ARCAD database contained 70 trials with ∼50 000 IPD. Conclusions: Based on our active collaboration, ARCAD-Asia was established, and a global integrated database was constructed. As a next step, we will continue to collect Asian IPD and expand the cancer types, leading to a more comprehensive and available global database.
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- 2023
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192. Marine biodegradation of poly[(R)-3-hydroxybutyrate-co-4-hydroxybutyrate] elastic fibers in seawater: dependence of decomposition rate on highly ordered structure
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Taku Omura, Sakura Tsujimoto, Satoshi Kimura, Akira Maehara, Taizo Kabe, and Tadahisa Iwata
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marine biodegradation ,polyhydroxyalkanoate ,Poly(3-hydroxybutyrate-co-4-hydroxybutyrate) ,elastic fiber ,highly ordered structure ,molecular orientation ,Biotechnology ,TP248.13-248.65 - Abstract
Here, we report the marine degradability of polymers with highly ordered structures in natural environmental water using microbial degradation and biochemical oxygen demand (BOD) tests. Three types of elastic fibers (non-porous as-spun, non-porous drawn, and porous drawn) with different highly ordered structures were prepared using poly[(R)-3-hydroxybutyrate-co-16 mol%-4-hydroxybutyrate] [P(3HB-co-16 mol%-4HB)], a well-known polyhydroxyalkanoate. Scanning electron microscopy (SEM) images indicated that microorganisms attached to the fiber surface within several days of testing and degraded the fiber without causing physical disintegration. The results of BOD tests revealed that more than 80% of P(3HB-co-16 mol%-4HB) was degraded by microorganisms in the ocean. The plastisphere was composed of a wide variety of microorganisms, and the microorganisms accumulated on the fiber surfaces differed from those in the biofilms. The microbial degradation rate increased as the degree of molecular orientation and porosity of the fiber increased: as-spun fiber < non-porous drawn fiber < porous drawn fiber. The drawing process induced significant changes in the highly ordered structure of the fiber, such as molecular orientation and porosity, without affecting the crystallinity. The results of SEM observations and X-ray measurements indicated that drawing the fibers oriented the amorphous chains, which promoted enzymatic degradation by microorganisms.
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- 2023
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193. Coexistence of muscle atrophy and high subcutaneous adipose tissue radiodensity predicts poor prognosis in hepatocellular carcinoma
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Masatsugu Ohara, Goki Suda, Risako Kohya, Takashi Sasaki, Tomoka Yoda, Sonoe Yoshida, Qingjie Fu, Zijian Yang, Shunichi Hosoda, Osamu Maehara, Shunsuke Ohnishi, Yoshimasa Tokuchi, Takashi Kitagataya, Naoki Kawagishi, Masato Nakai, Takuya Sho, Mitsuteru Natsuizaka, Koji Ogawa, and Naoya Sakamoto
- Subjects
low muscle mass ,psoas muscles ,skeletal muscle ,liver disease ,subcutaneous adipose tissue ,muscle atrophy ,Nutrition. Foods and food supply ,TX341-641 - Abstract
IntroductionWe aimed to assess the prognostic implications of muscle atrophy and high subcutaneous adipose tissue (SAT) radiodensity in patients with hepatocellular carcinoma (HCC).MethodsIn this retrospective study, muscle atrophy was assessed using the psoas muscle index (PMI) obtained from computed tomography. SAT radiodensity was evaluated based on radiodensity measurements. Survival and multivariate analyses were performed to identify factors associated with prognosis. The impact of muscle atrophy and high SAT radiodensity on prognosis was determined through survival analysis.ResultsA total of 201 patients (median age: 71 years; 76.6% male) with HCC were included. Liver cirrhosis was observed in 72.6% of patients, and the predominant Child–Pugh grade was A (77.1%). A total of 33.3% of patients exhibited muscle atrophy based on PMI values, whereas 12.9% had high SAT radiodensity. Kaplan–Meier survival analysis demonstrated that patients with muscle atrophy had significantly poorer prognosis than those without muscle atrophy. Patients with high SAT radiodensity had a significantly worse prognosis than those without it. Muscle atrophy, high SAT radiodensity, the Barcelona Clinic Liver Cancer class B, C, or D, and Child–Pugh score ≥ 6 were significantly associated with overall survival. Further classification of patients into four groups based on the presence or absence of muscle atrophy and high SAT radiodensity revealed that patients with both muscle atrophy and high SAT radiodensity had the poorest prognosis.ConclusionMuscle atrophy and high SAT radiodensity are significantly associated with poor prognosis in patients with HCC. Identifying this high-risk subgroup may facilitate the implementation of targeted interventions, including nutritional therapy and exercise, to potentially improve clinical outcomes.
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- 2023
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194. Overlooked plant diversity in urban streetscapes in Oulu and Yokohama
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Mirka K. Heikkinen, Yuki Iwachido, Xi Sun, Kaho Maehara, Mayuko Kawata, Sumire Yamamoto, Yui Tsuchihashi, and Takehiro Sasaki
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Pavement vegetation ,Street design ,Plant community ,Urbanization ,Biodiversity ,Ecology ,QH540-549.5 - Abstract
Streets comprise a major area of urban land use and connect built areas to one another. However, the role of streetscapes for maintaining urban plant diversity remains poorly understood. In this study, urban street vegetation was investigated in Oulu, Finland, and Yokohama, Japan, to explore how species richness and composition of plant communities change among different street habitat types, including road-verge grass beds, asphalted surfaces, stone pavements, curbside gaps, wall bases, street shrubbery, and tree bases. All plant species were recorded separately for different street habitat types along a maximum of 500 m of street sections. The gamma diversity of each habitat type and the contributions of native and exotic species were evaluated based on species accumulation curves. Plant species composition was examined using non-metric multidimensional scaling and Venn diagrams. A total of 145 and 273 species were recorded in Oulu and Yokohama, respectively. In Oulu, native species contributed more to the total diversity across habitat types, whereas in Yokohama, we observed similar contributions of native and exotic species to the total diversity. There was a large overlap in species occurrence among different habitat types in Oulu, where the road-verge grass beds included over 90 % of the total diversity, and all species present in asphalted habitats. Road verge grass beds in Oulu and street shrubbery in Yokohama include a large number of unique species, implying that these species have adapted to the environment in each habitat. Thus, streetscape vegetation includes a mixture of common urban species and some unique species depending on habitat type, which is often overlooked as a part of the spontaneous plant diversity across streetscapes. We propose that diverse street habitats, including both gray and green surfaces, support diverse plant species and may thereby create biodiverse urban streetscapes.
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- 2023
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195. Gastroenterology visitation and reminders predict surveillance uptake for patients with adenomas with high-risk features.
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Myint, Anthony, Corona, Edgar, Yang, Liu, Nguyen, Bao Sean, Lin, Christina, Huang, Marcela Zhou, Shao, Paul, Mwengela, Didi, Didero, Michelle, Asokan, Ishan, Bui, Alex AT, Hsu, William, Maehara, Cleo, Naini, Bita V, Kang, Yuna, Bastani, Roshan, and May, Folasade P
- Abstract
Individuals diagnosed with colorectal adenomas with high-risk features during screening colonoscopy have increased risk for the development of subsequent adenomas and colorectal cancer. While US guidelines recommend surveillance colonoscopy at 3 years in this high-risk population, surveillance uptake is suboptimal. To inform future interventions to improve surveillance uptake, we sought to assess surveillance rates and identify facilitators of uptake in a large integrated health system. We utilized a cohort of patients with a diagnosis of ≥ 1 tubular adenoma (TA) with high-risk features (TA ≥ 1 cm, TA with villous features, TA with high-grade dysplasia, or ≥ 3 TA of any size) on colonoscopy between 2013 and 2016. Surveillance colonoscopy completion within 3.5 years of diagnosis of an adenoma with high-risk features was our primary outcome. We evaluated surveillance uptake over time and utilized logistic regression to detect factors associated with completion of surveillance colonoscopy. The final cohort was comprised of 405 patients. 172 (42.5%) patients successfully completed surveillance colonoscopy by 3.5 years. Use of a patient reminder (telephone, electronic message, or letter) for due surveillance (adjusted odds = 1.9; 95%CI = 1.2-2.8) and having ≥ 1 gastroenterology (GI) visit after diagnosis of an adenoma with high-risk features (adjusted odds = 2.6; 95%CI = 1.6-4.2) significantly predicted surveillance colonoscopy completion at 3.5 years. For patients diagnosed with adenomas with high-risk features, surveillance colonoscopy uptake is suboptimal and frequently occurs after the 3-year surveillance recommendation. Patient reminders and visitation with GI after index colonoscopy are associated with timely surveillance completion. Our findings highlight potential health system interventions to increase timely surveillance uptake for patients diagnosed with adenomas with high-risk features.
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- 2021
196. State-Space Based Network Topology Identification
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Coutino, Mario, Isufi, Elvin, Maehara, Takanori, and Leus, Geert
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Electrical Engineering and Systems Science - Signal Processing - Abstract
In this work, we explore the state-space formulation of network processes to recover the underlying structure of the network (local connections). To do so, we employ subspace techniques borrowed from system identification literature and extend them to the network topology inference problem. This approach provides a unified view of the traditional network control theory and signal processing on networks. In addition, it provides theoretical guarantees for the recovery of the topological structure of a deterministic linear dynamical system from input-output observations even though the input and state evolution networks can be different., Comment: Work presented in ITA 2019
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- 2019
197. Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. X: The Tenth Year (2017)
- Author
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Kato, Taichi, Isogai, Keisuke, Wakamatsu, Yasuyuki, Hambsch, Franz-Josef, Itoh, Hiroshi, Tordai, Tamas, Vanmunster, Tonny, Dubovsky, Pavol A., Kudzej, Igor, Medulka, Tomas, Kimura, Mariko, Ohnishi, Ryuhei, Monard, Berto, Pavlenko, Elena P., Antonyuk, Kirill A., Pit, Nikolaj V., Antonyuk, Oksana I., Babina, Julia V., Baklanov, Aleksei V., Sosnovskij, Aleksei A., Pickard, Roger D., Miller, Ian, Maeda, Yutaka, de Miguel, Enrique, Brincat, Stephen M., Licchelli, Domenico, Cook, Lewis M., Shugarov, Sergey Yu., Zaostrojnykh, Anna M., Chochol, Drahomir, Golysheva, Polina, Katysheva, Natalia, Zubareva, Alexandra M., Stone, Geoff, Kasai, Kiyoshi, Starr, Peter, Littlefield, Colin, Kiyota, Seiichiro, Andreev, Maksim V., Sergeev, Alexandr V., Ruiz, Javier, Myers, Gordon, Simon, Andrii O., Vasylenko, Volodymyr V., Soldan, Francisco, Ogmen, Yenal, Nakajima, Kazuhiro, Nelson, Peter, Masi, Gianluca, Menzies, Kenneth, Sabo, Richard, Bolt, Greg, Dvorak, Shawn, Stanek, Krzysztof Z., Shields, Joseph V., Kochanek, Christopher S., Holoien, Thomas W. -S., Shappee, Benjamin, Prieto, Jose L., Kojima, Tadashi, Nishimura, Hideo, Kaneko, Shizuo, Fujikawa, Shigehisa, Stubbings, Rod, Muyllaert, Eddy, Poyner, Gary, Moriyama, Masayuki, Maehara, Hiroyuki, Schmeer, Patrick, and Denisenko, Denis
- Subjects
Astrophysics - Solar and Stellar Astrophysics - Abstract
Continuing the project described by Kato et al. (2009, PASJ, 61, S395, arXiv/0905.1757), we collected times of superhump maxima for 102 SU UMa-type dwarf novae observed mainly during the 2017 season and characterized these objects. WZ Sge-type stars identified in this study are PT And, ASASSN-17ei, ASASSN-17el, ASASSN-17es, ASASSN-17fn, ASASSN-17fz, ASASSN-17hw, ASASSN-17kd, ASASSN-17la, PNV J20205397+2508145 and TCP J00332502-3518565. We obtained new mass ratios for 7 objects using growing superhumps (stage A). ASASSN-17gf is an EI Psc-type object below the period minimum. CRTS J080941.3+171528 and DDE 51 are objects in the period gap and both showed long-lasting phase of stage A superhumps. We also summarized the recent advances in understanding of SU UMa-type and WZ Sge-type dwarf novae., Comment: The main text and Supporting information are combined in this arXiv version. Accepted for publication in PASJ, author list has been corrected. Follow-up to arXiv:1706.03870, arXiv:1605.06221, ... , arXiv:1009.5444, arXiv:0912.4321
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- 2019
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198. An optical search for transients lasting a few seconds
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Richmond, Michael W., Tanaka, Masaomi, Morokuma, Tomoki, Sako, Shigeyuki, Ohsawa, Ryou, Arima, Noriaki, Tominaga, Nozomu, Doi, Mamoru, Aoki, Tsutomu, Arimatsu, Ko, Ichiki, Makoto, Ikeda, Shiro, Ita, Yoshifusa, Kasuga, Toshihiro, Kawabata, Koji S., Kawakita, Hideyo, Kobayashi, Naoto, Kokubo, Mitsuru, Konishi, Masahiro, Maehara, Hiroyuki, Mito, Hiroyuki, Miyata, Takashi, Mori, Yuki, Morii, Mikio, Motohara, Kentaro, Nakada, Yoshikazu, Shin-Ich, Onozato, Hiroki, Sarugaku, Yuki, Sato, Mikiya, Shigeyama, Toshikazu, Soyano, Takao, Takahashi, Hidenori, Tanikawa, Ataru, Tarusawa, Ken'ichi, Urakawa, Seitaro, Usui, Fumihiko, Watanabe, Junichi, Yamashita, Takuya, and Yoshikawa, Makoto
- Subjects
Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Using a prototype of the Tomo-e Gozen wide-field CMOS mosaic camera, we acquire wide-field optical images at a cadence of 2 Hz and search them for transient sources of duration 1.5 to 11.5 seconds. Over the course of eight nights, our survey encompasses the equivalent of roughly two days on one square degree, to a fluence equivalent to a limiting magnitude about $V = 15.6$ in a 1-second exposure. After examining by eye the candidates identified by a software pipeline, we find no sources which meet all our criteria. We compute upper limits to the rate of optical transients consistent with our survey, and compare those to the rates expected and observed for representative sources of ephemeral optical light., Comment: Accepted for publication in PASJ, 26 pages, 10 figures. The posted version here is our original manuscript, before any changes in response to the referee's comments; to see a copy of the version which was accepted for publication, go to http://spiff.rit.edu/richmond/pub/tomoe_trans.pdf
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- 2019
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199. New constraint on the atmosphere of (50000) Quaoar from a stellar occultation
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Arimatsu, Ko, Ohsawa, Ryou, Hashimoto, George L., Urakawa, Seitaro, Takahashi, Jun, Tozuka, Miyako, Itoh, Yoichi, Yamashita, Misato, Usui, Fumihiko, Aoki, Tsutomu, Arima, Noriaki, Doi, Mamoru, Ichiki, Makoto, Ikeda, Shiro, Ita, Yoshifusa, Kasuga, Toshihiro, Kobayashi, Naoto, Kokubo, Mitsuru, Konishi, Masahiro, Maehara, Hiroyuki, Matsunaga, Noriyuki, Miyata, Takashi, Morii, Mikio, Morokuma, Tomoki, Motohara, Kentaro, Nakada, Yoshikazu, Okumura, Shin-ichiro, Sako, Shigeyuki, Sarugaku, Yuki, Sato, Mikiya, Shigeyama, Toshikazu, Soyano, Takao, Takahashi, Hidenori, Tarusawa, Ken'ichi, Tominaga, Nozomu, Watanabe, Jun-ichi, Yamashita, Takuya, and Yoshikawa, Makoto
- Subjects
Astrophysics - Earth and Planetary Astrophysics - Abstract
We report observations of a stellar occultation by the classical Kuiper belt object (50000) Quaoar occurred on 28 June 2019. A single-chord high-cadence (2 Hz) photometry dataset was obtained with the Tomo-e Gozen CMOS camera mounted on the 1.05 m Schmidt telescope at Kiso Observatory. The obtained ingress and egress data do not show any indication of atmospheric refraction and allow to set new $1\sigma$ and $3\sigma$ upper limits of 6 and 16 nbar, respectively, for the surface pressure of a pure methane atmosphere. These upper limits are lower than the saturation vapor pressure of methane at Quaoar's expected mean surface temperature ($T \sim 44$ K) and imply the absence of a $\sim$10 nbar-level global atmosphere formed by methane ice on Quaoar's surface., Comment: 12 pages, 3 figures, accepted for publication in the Astronomical Journal
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- 2019
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200. A Simple Proof of the Universality of Invariant/Equivariant Graph Neural Networks
- Author
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Maehara, Takanori and NT, Hoang
- Subjects
Computer Science - Machine Learning ,Statistics - Machine Learning - Abstract
We present a simple proof for the universality of invariant and equivariant tensorized graph neural networks. Our approach considers a restricted intermediate hypothetical model named Graph Homomorphism Model to reach the universality conclusions including an open case for higher-order output. We find that our proposed technique not only leads to simple proofs of the universality properties but also gives a natural explanation for the tensorization of the previously studied models. Finally, we give some remarks on the connection between our model and the continuous representation of graphs.
- Published
- 2019
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