Search

Your search keyword '"Yoneda, Takeshi"' showing total 12 results
Start Over Author "Yoneda, Takeshi" Publication Year Range Last 10 years
12 results on '"Yoneda, Takeshi"'

1. Algorithms and System Architecture for Immediate Personalized News Recommendations

Author

Yoneda, Takeshi, Kozawa, Shunsuke, Osone, Keisuke, Koide, Yukinori, Abe, Yosuke, and Seki, Yoshifumi

Subjects
Computer Science - Information Retrieval
Abstract

Personalization plays an important role in many services, just as news does. Many studies have examined news personalization algorithms, but few have considered practical environments. This paper provides algorithms and system architecture for generating immediate personalized news in a practical environment. Immediacy means changes in news trends and user interests are reflected in recommended news lists quickly. Since news trends and user interests rapidly change, immediacy is critical in news personalization applications. We develop algorithms and system architecture to realize immediacy. Our algorithms are based on collaborative filtering of user clusters and evaluate news articles using click-through rate and decay scores based on the time elapsed since the user's last access. Existing studies have not fully discussed system architecture, so a major contribution of this paper is that we demonstrate a system architecture and realize our algorithms and a configuration example implemented on top of Amazon Web Services. We evaluate the proposed method both offline and online. The offline experiments are conducted through a real-world dataset from a commercial news delivery service, and online experiments are conducted via A/B testing on production environments. We confirm the effectiveness of our proposed method and also that our system architecture can operate in large-scale production environments., Comment: WI '19

Published
2019

2. Greedy Optimized Multileaving for Personalization

Author

Iizuka, Kojiro, Yoneda, Takeshi, and Seki, Yoshifumi

Subjects
Computer Science - Information Retrieval
Abstract

Personalization plays an important role in many services. To evaluate personalized rankings, online evaluation, such as A/B testing, is widely used today. Recently, multileaving has been found to be an efficient method for evaluating rankings in information retrieval fields. This paper describes the first attempt to optimize the multileaving method for personalization settings. We clarify the challenges of applying this method to personalized rankings. Then, to solve these challenges, we propose greedy optimized multileaving (GOM) with a new credit feedback function. The empirical results showed that GOM was stable for increasing ranking lengths and the number of rankers. We implemented GOM on our actual news recommender systems, and compared its online performance. The results showed that GOM evaluated the personalized rankings precisely, with significantly smaller sample sizes (< 1/10) than A/B testing., Comment: RecSys 2019

Published
2019

4. PHOSPHATEMIC INDEX EVALUATES PHOSPHORUS LOAD

Author

Narasaki, Yoko, Yamasaki, Michiyo, Matsuura, Sayaka, Morinishi, Mayumi, Nakagawa, Tomomi, Matsuno, Mami, Katsumoto, Misaki, Nii, Sachi, Fushitani, Yuka, Sugihara, Kohei, Noda, Tsuneyuki, Yoneda, Takeshi, Masuda, Masashi, Yamanaka-Okumura, Hisami, Takeda, Eiji, Sakaue, Hiroshi, Yamamoto, Hironori, and Taketani, Yutaka

Subjects
Crossover study, digestive, oral, and skin physiology, Phosphatemix Index, Dietary phosphorus bioavailability, Whole-foods approach
Abstract

Objective: Dietary phosphorus (P) restriction is crucial to treat hyperphosphatemia and reduce cardiovascular disease risk and mortality in patients with chronic kidney disease (CKD) and the wider population. Various methods for dietary P restriction exist, but the bioavailability of P in food should also be considered when making appropriate food choices to maintain patients’ quality of life. Here, we propose the ‘‘Phosphatemic Index’’ (PI) as a novel tool for evaluating dietary P load based on P bioavailability; we also evaluated the effect of continuous intake of different PI foods in mixed meals on serum intact fibroblast growth factor 23 concentration. Design and Methods: A 2-stage crossover study was conducted: Study 1: 20 healthy participants consumed 10 different foods containing 200 mg of P, and the PI was calculated from the area under the curve of a time versus serum P concentration curve; Study 2: 10 healthy participants consumed 4 different test meals (low, medium, or high PI meals or a control) over a 5-day period. Results: Study 1 showed milk and dairy products had high PI values, pork and ham had medium PI values, and soy and tofu had low PI values. In Study 2, ingestion of high PI test meals showed higher fasting serum intact fibroblast growth factor 23 levels and lower serum 1,25-dihydroxyvitamin D levels compared with ingestion of low PI test meals. Conclusion: These findings suggest that the PI can usefully evaluate the dietary P load of various foods and may help to make appropriate food choices for dietary P restriction in CKD patients.

Published
2020

8. Tackler’s head position relative to the ball carrier is highly correlated with head and neck injuries in rugby

Author

Sobue, Shogo, primary, Kawasaki, Takayuki, additional, Hasegawa, Yoshinori, additional, Shiota, Yuki, additional, Ota, Chihiro, additional, Yoneda, Takeshi, additional, Tahara, Shigeyuki, additional, Maki, Nobukazu, additional, Matsuura, Takahiro, additional, Sekiguchi, Masahiro, additional, Itoigawa, Yoshiaki, additional, Tateishi, Tomohiko, additional, and Kaneko, Kazuo, additional

Published
2017
Full Text
View/download PDF

10. Tackler's head position relative to the ball carrier is highly correlated with head and neck injuries in rugby.

Author

Shogo Sobue, Takayuki Kawasaki, Yoshinori Hasegawa, Yuki Shiota, Chihiro Ota, Takeshi Yoneda, Shigeyuki Tahara, Nobukazu Maki, Takahiro Matsuura, Masahiro Sekiguchi, Yoshiaki Itoigawa, Tomohiko Tateishi, Kazuo Kaneko, Sobue, Shogo, Kawasaki, Takayuki, Hasegawa, Yoshinori, Shiota, Yuki, Ota, Chihiro, Yoneda, Takeshi, and Tahara, Shigeyuki

Subjects
NECK injuries, HEAD injuries, RUGBY football techniques, RUGBY football injuries, SPORTS injuries risk factors
Abstract

Objectives: To characterise the tackler's head position during one-on-one tackling in rugby and to determine the incidence of head, neck and shoulder injuries through analysis of game videos, injury records and a questionnaire completed by the tacklers themselves.Methods: We randomly selected 28 game videos featuring two university teams in competitions held in 2015 and 2016. Tackles were categorised according to tackler's head position. The 'pre-contact phase' was defined; its duration and the number of steps taken by the ball carrier prior to a tackle were evaluated.Results: In total, 3970 tackles, including 317 (8.0%) with the tackler's head incorrectly positioned (ie, in front of the ball carrier) were examined. Thirty-two head, neck or shoulder injuries occurred for an injury incidence of 0.8% (32/3970). The incidence of injury in tackles with incorrect head positioning was 69.4/1000 tackles; the injury incidence with correct head positioning (ie, behind or to one side of the ball carrier) was 2.7/1000 tackles. Concussions, neck injuries, 'stingers' and nasal fractures occurred significantly more often during tackles with incorrect head positioning than during tackles with correct head positioning. Significantly fewer steps were taken before tackles with incorrect head positioning that resulted in injury than before tackles that did not result in injury.Conclusion: Tackling with incorrect head position relative to the ball carrier resulted in a significantly higher incidence of concussions, neck injuries, stingers and nasal fractures than tackling with correct head position. Tackles with shorter duration and distance before contact resulted in more injuries. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

12. Tackler’s head position relative to the ball carrier is highly correlated with head and neck injuries in rugby

Author

Sobue, Shogo, Kawasaki, Takayuki, Hasegawa, Yoshinori, Shiota, Yuki, Ota, Chihiro, Yoneda, Takeshi, Tahara, Shigeyuki, Maki, Nobukazu, Matsuura, Takahiro, Sekiguchi, Masahiro, Itoigawa, Yoshiaki, Tateishi, Tomohiko, and Kaneko, Kazuo

Abstract

ObjectivesTo characterise the tackler’s head position during one-on-one tackling in rugby and to determine the incidence of head, neck and shoulder injuries through analysis of game videos, injury records and a questionnaire completed by the tacklers themselves.MethodsWe randomly selected 28 game videos featuring two university teams in competitions held in 2015 and 2016. Tackles were categorised according to tackler’s head position. The ‘pre-contact phase’ was defined; its duration and the number of steps taken by the ball carrier prior to a tackle were evaluated.ResultsIn total, 3970 tackles, including 317 (8.0%) with the tackler’s head incorrectly positioned (ie, in front of the ball carrier) were examined. Thirty-two head, neck or shoulder injuries occurred for an injury incidence of 0.8% (32/3970). The incidence of injury in tackles with incorrect head positioning was 69.4/1000 tackles; the injury incidence with correct head positioning (ie, behind or to one side of the ball carrier) was 2.7/1000 tackles. Concussions, neck injuries, ‘stingers’ and nasal fractures occurred significantly more often during tackles with incorrect head positioning than during tackles with correct head positioning. Significantly fewer steps were taken before tackles with incorrect head positioning that resulted in injury than before tackles that did not result in injury.ConclusionTackling with incorrect head position relative to the ball carrier resulted in a significantly higher incidence of concussions, neck injuries, stingers and nasal fractures than tackling with correct head position. Tackles with shorter duration and distance before contact resulted in more injuries.

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results