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388 results on '"Sakurai, Yutaka"'

1. Formulations to select assets for constructing sparse index tracking portfolios

Author

Sakurai, Yutaka, Wakabayashi, Daiki, and Ishizaki, Fumio

Subjects
Computer Science - Computational Engineering, Finance, and Science
Abstract

In this paper, we study asset selection methods to construct a sparse index tracking portfolio. For its advantage over full replication portfolio, the concept of sparse index tracking portfolio has significant attention in the field of finance and investment management. We propose useful formulations to select assets for sparse index tracking portfolio. Our formulations are described as combinatorial optimization problems, and they can yield various asset selection methods, including some existing methods, by adjusting the values of parameters. As a result, the proposed formulations can provide a well-balanced asset selection to create successful sparse index tracking portfolios. We also provide numerical examples to compare the tracking performance of resulting sparse index tracking portfolios.

Published
2023

17. A common variant of leucine-rich repeat-containing 16A (LRRC16A) gene is associated with gout susceptibility

Author

Sakiyama, Masayuki, Matsuo, Hirotaka, Shimizu, Seiko, Chiba, Toshinori, Nakayama, Akiyoshi, Takada, Yuzo, Nakamura, Takahiro, Takada, Tappei, Morita, Emi, Naito, Mariko, Wakai, Kenji, Inoue, Hiroki, Tatsukawa, Seishiro, Sato, Junki, Shimono, Kazumi, Makino, Toshiaki, Satoh, Takahiro, Suzuki, Hiroshi, Kanai, Yoshikatsu, Hamajima, Nobuyuki, Sakurai, Yutaka, Ichida, Kimiyoshi, Shimizu, Toru, and Shinomiya, Nariyoshi

Published
2014
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18. Genome-wide association study of clinically defined gout identifies multiple risk loci and its association with clinical subtypes

Author

Matsuo, Hirotaka, Yamamoto, Ken, Nakaoka, Hirofumi, Nakayama, Akiyoshi, Sakiyama, Masayuki, Chiba, Toshinori, Takahashi, Atsushi, Nakamura, Takahiro, Nakashima, Hiroshi, Takada, Yuzo, Danjoh, Inaho, Shimizu, Seiko, Abe, Junko, Kawamura, Yusuke, Terashige, Sho, Ogata, Hiraku, Tatsukawa, Seishiro, Yin, Guang, Okada, Rieko, Morita, Emi, Naito, Mariko, Tokumasu, Atsumi, Onoue, Hiroyuki, Iwaya, Keiichi, Ito, Toshimitsu, Takada, Tappei, Inoue, Katsuhisa, Kato, Yukio, Nakamura, Yukio, Sakurai, Yutaka, Suzuki, Hiroshi, Kanai, Yoshikatsu, Hosoya, Tatsuo, Hamajima, Nobuyuki, Inoue, Ituro, Kubo, Michiaki, Ichida, Kimiyoshi, Ooyama, Hiroshi, Shimizu, Toru, and Shinomiya, Nariyoshi

Published
2016
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19. A common missense variant of monocarboxylate transporter 9 (MCT9/SLC16A9) gene is associated with renal overload gout, but not with all gout susceptibility

Author

Nakayama, Akiyoshi, Matsuo, Hirotaka, Shimizu, Takuya, Ogata, Hiraku, Takada, Yuzo, Nakashima, Hiroshi, Nakamura, Takahiro, Shimizu, Seiko, Chiba, Toshinori, Sakiyama, Masayuki, Ushiyama, Chisaki, Takada, Tappei, Inoue, Katsuhisa, Kawai, Sayo, Hishida, Asahi, Wakai, Kenji, Hamajima, Nobuyuki, Ichida, Kimiyoshi, Sakurai, Yutaka, Kato, Yukio, Shimizu, Toru, and Shinomiya, Nariyoshi

Published
2013
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26. Impact of Oral Health Status on Perceived Dental Problems Among Japan Maritime Self-Defense Force Personnel.

Author

Sonoda, Chikanobu, Sakurai, Yutaka, Okoda, Manabu, Ebisawa, Masato, Nakashima, Hiroshi, and Tsunoda, Masashi

Subjects
*PHYSICAL diagnosis, *ORAL health, *ODDS ratio, *MILITARY personnel
Abstract

Introduction: Dental problems may have a great impact on military mission effectiveness, as such, evidence-based dental classification guidelines are required for minimizing the occurrence of dental problems. The aim of this study is to elucidate the independent contribution of each oral disease to the perception of dental problems among Japan Maritime Self-Defense Force (JMSDF) personnel in order to make the dental classification guidelines more precise for the prediction of future dental problems.Materials and Methods: Japan Maritime Self-Defense Force personnel who were examined during the annual dental checkup in 2013 answered questions about the experience of dental problems within the last 12 months in 2014. The associations between the items of a dental checkup and the perception of dental problems were examined using multiple logistic regression analysis with a stepwise procedure to calculate odds ratios (ORs) and 95% CIs.Results: The data of a total of 22,441 subjects were included in the analysis. Those who declared to have perceived dental problems within the last 12 months were 5,088 (22.7%). The multiple logistic regression analysis showed that personnel who had decayed teeth had a higher chance of experiencing dental problems than those who had no dental caries. Personnel whose periodontal disease was judged to be more severe in a dental examination had a greater OR for the perception of dental problems.Conclusion: These results may become recommendations for operations in the JMSDF dental classification system. [ABSTRACT FROM AUTHOR]

Published
2022
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29. Mutations in glucose transporter 9 gene SLC2A9 cause renal hypouricemia

Author

Matsuo, Hirotaka, Chiba, Toshinori, Nagamori, Shushi, Nakayama, Akiyoshi, Domoto, Hideharu, Phetdee, Kanokporn, Wiriyasermkul, Pattama, Kikuchi, Yuichi, Oda, Takashi, Nishiyama, Junichiro, Nakamura, Takahiro, Morimoto, Yuji, Kamakura, Keiko, Sakurai, Yutaka, Nonoyama, Shigeaki, Kanai, Yoshikatsu, and Shinomiya, Nariyoshi

Subjects
Hyperuricemia -- Causes of, Hyperuricemia -- Genetic aspects, Gene mutations -- Analysis, Uric acid -- Chemical properties, Biological sciences
Abstract

Several studies are conducted to determine the causes of renal hypouricemia, an inherited disorder that leads to impaired renal urate (uric acid) and subsequent low serum urate levels. The mutations taking place in the glucose transporter 9 gene, SLC2A9 is shown to be the major factor that leads to the disorder.

Published
2008

30. Effects of pioglitazone and candesartan on renal fibrosis and the intrarenal plasmin cascade in spontaneously hypercholesterolemic rats

Author

Omasu, Fumihiro, Oda, Takashi, Yamada, Muneharu, Yoshizawa, Nobuyuki, Yamakami, Kazuo, Sakurai, Yutaka, and Miura, Soichiro

Subjects
Candesartan -- Influence, Candesartan -- Properties, Kidneys -- Medical examination, Fibrosis -- Diagnosis, Hypercholesterolemia -- Physiological aspects, Biological sciences
Abstract

The profibrotic effect of plasminogen activator inhibitor-1 (PAI-1) in renal fibrosis is widely recognized, but its mechanism remains controversial especially in chronic progressive kidney disease. In the present study, pioglitazone (Pio) and candesartan (CD), which are reported to inhibit PAI-1, were administered to spontaneously hypercholesterolemic (SHC) rats, a model of chronic progressive kidney disease. Therapeutic effects and effects on the intrarenal plasmin cascade were examined. Eight-wk-old SHC rats were used as controls. Oral administration of vehicle alone, Pio, or CD was performed starting at 8 wk of age and was continued for 24 wk. The degree of renal fibrosis was evaluated by sirius red staining of kidney sections and by total collagen assay of renal homogenates. The renal PAI-1 protein level was assessed by Western blotting, and plasmin activity was analyzed by chromogenic assay and casein gel zymography. Urinary protein and blood urea nitrogen were significantly increased in the vehicle-treated group, but the increase was attenuated in the Pio- and CD-treated groups. This correlated well with the degree of fibrosis as assessed by sirius red staining and total collagen assay. The PAI-1 protein level was also increased significantly in the vehicle-treated group, and the increase was attenuated in the Pio- and CD-treated groups. Despite the presumed plasmin-inhibitory function of PAI-1, plasmin activity changed in parallel with PAI-1. These results suggest that Pio and CD inhibit PAI-1 and exert renoprotective effects against chronic progressive renal disease, but its action is independent of the regulatory function on plasmin activity. angiotensin II type 1 receptor blocker; peroxisome proliferator-activated receptor-[gamma] agonist; plasminogen activator inhibitor-1

Published
2007

39. Shortcomings in Discussion

Author

Tokumaru, Osamu, Haruki, Kosuke, Bacal, Kira, Katagiri, Tomomi, Yamamoto, Taisuke, and Sakurai, Yutaka

Published
2006

45. Scleral buckling versus vitrectomy for young japanese patients with rhegmatogenous retinal detachment in the era of microincision surgery: real‐world evidence from a multicentre study in Japan

Author

Shu, Ingen, primary, Ishikawa, Hiroto, additional, Nishikawa, Hiroki, additional, Morikawa, Shohei, additional, Okamoto, Fumiki, additional, Sakamoto, Taiji, additional, Sugimoto, Masahiko, additional, Kondo, Mineo, additional, Iwasaki, Masanori, additional, Kinoshita, Takamasa, additional, Toibana, Toshi, additional, Mitamura, Yoshinori, additional, Takamura, Yoshihiro, additional, Motohashi, Ryosuke, additional, Shimura, Masahiko, additional, Sakurai, Yutaka, additional, Takeuchi, Masaru, additional, and Gomi, Fumi, additional

Published
2019
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47. Abustracts from Japanese journal of hygiene (Nihon Eiseigaku Zasshi) vol.52 no.4

Author

Sakaguchi, Takehiro, Sakaguchi, Sanae, Kudo, Yoshiro, Yanagisawa, Hiroyuki, Kuwano (Oga), Toshiko, Takada, Haruko, Washino, Kaei, Inaba, Ryoichi, Yumoto, Yoshiko, Iwata, Hirotoshi, Shibazaki, Satomi, Nagai, Masaki, Asou, Eiko, Nakamura, Yosikazu, Yanagawa, Hiroshi, Kawamura, Takashi, Ohno, Yoshiyuki, Umeda, Takashi, Nakaji, Sigeyuki, Sugawara, Kazuo, Kurakake, Shigeyoshi, Okamura, Noriyoshi, Ohshita, Yoshiko, Sakurai, Yutaka, Yoshizawa, Nobuyuki, Kuriyama, Takao, Oishi, Katsutaka, Kakazu, Hitosa, Machida, Kazuhiko, Oki, Izumi, Tanihara, Shinichi, Ojima, Toshiyuki, Mori, Tomio, Hirai, Toshiyuki, Tomiyama, Takeshi, Iida, Kadzutada, Miyakoshi, Shinji, Sato, Kazuhiro, Kusaka, Yukinori, Yanagihara, Makoto, Ueda, Keiichi, Nakaji, Shigeyuki, and Oshita, Yoshiko

Published
1998
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49. Numerical simulation of unidirectional anisotropy in ferro(F)/antiferromagnetic(AF) exchange coupled layers with a compensated AF-interface

Author

Sakurai, Yutaka and Fujiwara, Hideo

Subjects
Anisotropy -- Research, Simulation methods -- Research, Ferromagnetism -- Research, Physics
Abstract

A zero-K Monte Carlo simulation is performed for ferro/antiferromagnetic (F/AF) coupled systems of simple cubic structure. By assuming the existence of a plane in the AF-layer across which the AF-spins loosely with each other, it is noticed that a typical 360 degrees symmetry anisotropy appears without assuming any AF-spin constraint in the plane.

Published
2003

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