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- 저자 : Saori Matsuda (검색결과 3 건)
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Evolving Adaptive Group Behavior in a Multi-Robot System
Saori Iwanaga,Kazuhiro Ohkura,Tomoya Matsuda 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The field of multi-robot systems is sometimes called swarn robotics when the systems consist of many simple autonomous robots. However, each robot is usually assumed to have no learning mechanism for adapting to an embedded changing environment. Therefore, collective behavior is expected to emerge in the system only through interactions among the robots. This implies that they cannot be coordinating as a group. In this study, an evolutionary robotics approach is applied empirically to a multi-robot system to realize autonomous task allocation behavior as a kind of intelligent swarm robotics. Although artificial evolution has proven to be a promising approach to coordinate the controller of an autonomous robot, its effectiveness in developing beneficial collective behavior in a multi-robot system has not been verified. Serveral computer simulations are conducted to examine how artificial evolution contributes to autonomous task allocation in a multi-robot system.
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Satoshi Soen,Yuki Arai,Saori Matsuda,Kento Emori,Toshimi Ikezaki,Mitsuharu Osawa 대한골다공증학회 2020 Osteoporosis and Sarcopenia Vol.6 No.4
Objectives: This postmarketing study aims to evaluate the safety and effectiveness of oral administration of risedronate at 75 mg once monthly for 36 months in patients with osteoporosis in Japan. Methods: Participants were ambulatory outpatients with osteoporosis who were ≥ 50 years old and had prevalent vertebral fractures. Outcomes were the incidence rate of adverse drug reaction (ADR), cumulative incidence of vertebral, nonvertebral, and hip fractures, the percent changes of lumbar spinal L2–4 bone mineral density (BMD), and low back pain. In addition, medication compliance was examined. Results: Safety, vertebral fractures, and other outcomes were analyzed in 542, 328, and 535 patients, respectively. In the safety analysis set, 88.38% of the patients were women and the mean age was 75.9 years. The monthly medication compliance rate ranged from 83.24% to 95.38%. The incidence rate of ADRs, including 4 severe ADRs, was 10.52% (n = 57). The common ADRs were gastrointestinal disorders, musculoskeletal, and connective tissue disorders. No osteonecrosis of the jaw was reported. The cumulative incidences (95% CI) of vertebral, nonvertebral, and hip fractures at 36 months were 12.58% (8.61–18.18), 6.59% (4.31–10.01), and 1.58% (0.64–3.88), respectively. The L2–4 BMD increased by 10.59% compared with baseline value (P < 0.01), and the proportion of patients with low back pain decreased to 30.77%, at 36 months. Conclusions: Administering 75 mg of risedronate once a month remains a favorable compliance rate and may be useful for the treatment of patients, even the elderly, with osteoporosis in daily practice.
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Singlet-triplet Crossover in the Two-dimensional Dimer Spin System YbAl3C3
Shunichiro Kittaka,Tomoyoshi Sugiyama,Yasuyuki Shimura,Toshiro Sakakibara,Saori Matsuda,Akira Ochiai 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Low-temperature magnetization (M) measurements down to 0.1 K have been performed in magneticfields up to 14.5 T for a single piece of a tiny single-crystalline sample ( 0.2 mg weight) ofthe spin-gap system YbAl3C3. At the base temperature of 0.1 K, several metamagnetic transitionswere clearly observed for H k c in the range 6 T < µ0H < 9 T whereas only two transitions wereobserved, one at 4.8 T and the other at 6.6 T, for H k a. At fields above 9 T, the magnetization becomesalmost saturated for both H k a and H k c. The present results indicate that a singlet-tripletcrossover occurs in a relatively narrow field range, suggesting a rather weak interdimer interactionin spite of the nearly triangular lattice of Yb ions.
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