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Okubo, H,Sasaki, S,Murakami, K,Kim, M K,Takahashi, Y,Hosoi, Y,Itabashi, M Nature Publishing Group 2008 International Journal of Obesity Vol.32 No.3
Objective:To examine associations between dietary patterns and obesity.Design:Cross-sectional study.Subjects:A total of 3760 Japanese female dietetic course students aged 18–20 years from 53 institutions in Japan.Measurements:Diet was assessed over a 1-month period with a validated self-administered diet history questionnaire with 148 food items, from which 30 food groups were created and entered into a factor analysis. Body mass index (BMI) was calculated from self-reported body height and weight.Results:Mean BMI (±s.d.) was 20.9±2.8 kg m<SUP>−2</SUP>. Four dietary patterns were identified. After adjustment for several confounding factors and total energy intake, the ‘Healthy’ pattern, characterized by high intakes of vegetables, mushrooms, seaweeds, potatoes, fish and shellfish, soy products, processed fish, fruit and salted vegetables, was significantly associated with a lower risk of BMI25 (odds ratio of the highest quintile vs lowest, 0.57; 95% confidence interval: 0.37–0.87; P for trend <0.05). In contrast, the ‘Japanese traditional’ pattern, characterized by high intakes of rice, miso soup and soy products, and the ‘Western’ pattern, characterized by high intakes of meats, fats and oils, seasonings, processed meats and eggs, were both significantly associated with an increased risk of BMI25 (OR: 1.77; 95% CI: 1.17–2.67; P for trend <0.01 and OR: 1.56; 95% CI: 1.01–2.40; P for trend=0.04, respectively).Conclusion:Three major dietary patterns, Healthy, Japanese traditional and Western, were all independently and significantly related to the risk of obesity even among a relatively lean young Japanese female population.International Journal of Obesity (2008) 32, 541–549; doi:10.1038/sj.ijo.0803737; published online 25 September 2007
The Embedment of a Metadata System at Grid Farms at the Belle II Experiment
S. Ahn,J. H. Kim,T. Huh,S. Hwang,조기현,H. Jang,B. K. Kim,H. Yoon,J. Yu,Z. Drasal,T. Hara,Y. Iida,R. Itoh,G. Iwai,N. Katayama,Y. Kawai,S. Nishida,T. Sasaki,Y. Watase,T. Uglov,R. Fruhwirth 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.4
In order to search for new physics beyond the standard model, the next generation of B-factory experiment, Belle II will collect a huge data sample that is a challenge for computing systems. The Belle II experiment, which should commence data collection in 2015, expects data rates 50 times greater than that of Belle. In order to handle this amount of data, we need a new data handling system based on a new computing model, which is a distributed computing model including grid farms as opposed to the central computing model using clusters at the Belle experiment. We have constructed a metadata system and embedded the system in the grid farms of the Belle II experiment. We have tested the system using grid farms. Results show good performance in handling such a huge amount of data.
Traffic Signal Control Considering Switching Timing via Distributed Model Predictive Control
S. Sasaki,T. Namerikawa 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In this paper, we aim to alleviate traffic congestion on each link online by traffic signal control for local road transport network to be controlled. We first propose a transportation model with time delay system considering the travel time of the vehicle and calculate the optimal signal phases with variable cycle length and offset using distributed model predictive control for that model to reduce congestion rate on local roads. We then explain algorithms for distributed control that each intersection solves the optimization problem in parallel sharing information only with adjacent intersection. Finally, the effectiveness of the proposed method is confirmed by numerical simulation.
Design of the Advanced Metadata Service System with AMGA for the Belle II Experiment
S. Ahn,K. Cho,S. Hwang,J. Kim,H. Jang,B. K. Kim,H. Yoon,J. Yu,Z. Drasal,T. Hara,Y. Iida,R. Itoh,G. Iwai,N. Katayama,Y. Kawai,S. Nishida,T. Sasaki,Y. Watase,R. Fruhwirth,W. Mitaroff,R. Grzymkowski,M. S 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
The Belle II experiment is expected to produce 50 times more data than the existing Belle experiment. Such huge data production requires not only scalability with respect to the storage service but also scalability regarding the metadata service. There has already been a metadata service at the Belle experiment, but it is not proper for the Belle II experiment because it has scalability problems and it is not intended to be used in a distributed grid environment. To deal with these issues, we designed an advanced metadata service system based on AMGA, which provides efficient and scalable metadata searching. We have built testbed sites to test the correctness, performance and scalability of the advanced metadata service system, and it has been proved to be able to provide efficient metadata searching for the Belle II experiment.
Screening of cosmological constant in non-local gravity
Nojiri, S.,Odintsov, S.D.,Sasaki, M.,Zhang, Y.l. North-Holland Pub. Co 2011 Physics letters: B Vol.696 No.3
We discuss a possible mechanism to screen a cosmological constant in non-local gravity. We find that in a simple model of non-local gravity with the Lagrangian of the form, R+f(@?<SUP>-1</SUP>R)-2Λ where f(X) is a quadratic function of X, there is a flat spacetime solution despite the presence of the cosmological constant Λ. Unfortunately, however, we also find that this solution contains a ghost in general. Then we discuss the condition to avoid a ghost and find that one can avoid it only for a finite range of 'time'. Nevertheless our result suggests the possibility of solving the cosmological constant problem in the context of non-local gravity.