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RISS 인기검색어
- 검색키워드
- 저자 : Masashi Yanagisawa (검색결과 4 건)
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Matsuno, Shota,Togawa, Masashi,Yanagisawa, Masao,Kimura, Shinji,Sugibayashi, Tadahiko,Togawa, Nozomu The Institute of Electronics and Information Engin 2013 IEIE Transactions on Smart Processing & Computing Vol.2 No.4
A number of systems have several on-chip memories with cache memory being one of them. Conventional cache memory consists of SRAM but the ratio of static energy to the total energy of the memory architecture becomes larger as the leakage power of traditional SRAM increases. Spin-Torque Transfer RAM (STT-RAM), which is a variety of Non-Volatile Memory (NVM), has many advantages over SRAM, such as high density, low leakage power, and non-volatility, but it consumes too much writing energy. This study evaluated a wide range of energy consumptions of a two-level cache using NVM partially on a mobile processor. Through a number of experimental evaluations, it was confirmed that the use of NVM partially in the two-level cache effectively reduces energy consumption significantly.
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Effects of Body Pillow Use on Sleeping Posture and Sleep Architecture in Healthy Young Adults
Park Insung,Suzuki Chihiro,Suzuki Yoko,Kawana Fusae,Yajima Katsuhiko,Fukusumi Shoji,Kokubo Toshio,Tokuyama Kumpei,Yanagisawa Masashi,Satoh Makoto 대한수면학회 2021 sleep medicine research Vol.12 No.1
Background and Objective Patients with position-dependent obstructive sleep apnea have a > 2-fold higher apnea-hypopnea index when sleeping in a supine position compared with a non-supine position. We investigated the effect of body pillow use on sleeping body position and sleep architecture in healthy young adults. Methods In experiment 1, we evaluated the body pressure distribution with or without body pillow use in 8 healthy young adults [age, 36.5 ± 13.0 years; body mass index (BMI); 20.6 ± 1.2 kg/m2]. In experiment 2, we performed a randomized-crossover intervention study to evaluate the effects of body pillow use on sleeping position and sleep architecture in 10 healthy young adults (age, 24.3 ± 7.8 years; BMI, 21.4 ± 1.7 kg/m2). Sleep architecture was characterized by polysomnography, and body positions were monitored using a sensor. Subjective sleep quality was evaluated with the Oguri-Shirakawa-Azumi sleep inventory, middle age and aged version. Results In experiment 1, body pillow use significantly reduced mean body pressure on the shoulder, hip, and whole body. In experiment 2, mean time spent in the supine, lateral, and prone body positions did not differ significantly between the 2 trials. Body pillow use, however, significantly extended the sustained time spent in the lateral body position compared with the control trial. Subjective sleep quality and sleep architecture did not differ significantly between the 2 trials, but body pillow use decreased the number of short (30 s) slow-wave sleep episodes. Conclusions Sleeping with a body pillow effectively extends sustained time in a lateral sleeping position and prevents segmentation of slow-wave sleep episodes.
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Improvement of Slow Wave Sleep Continuity by Mattress with Better Body Pressure Dispersal
Momoko Kayaba,Hitomi Ogata,Insung Park,Asuka Ishihara,Fusae Kawana,Toshio Kokubo,Shoji Fukusumi,Michiko Hayashi,Kumpei Tokuyama,Masashi Yanagisawa,Makoto Satoh 대한수면학회 2019 sleep medicine research Vol.10 No.2
Background and Objective This study evaluated the effects of a mattress with better body pressure dispersal in comparison to a control mattress on sleep quality. Methods In this randomized crossover study, 10 healthy young men slept in an experimental sleep room on either a functional mattress made from polyurethane, with a special four-layer three-dimensional structure, or a control mattress made from solid polyester wadding, which is a mattress commercially available in Japan. Polysomnography recordings were used to characterize sleep architecture, and the length of slow wave sleep (SWS) episodes and delta power density were calculated from the electroencephalography data and subjective sleep quality was evaluated by questionnaire they answered after waking. Results There were no significant differences in sleep latency, the total duration of each sleep stages, total sleep time, or sleep efficiency. Although the difference was subtle, delta power density significantly increased with the functional mattress. There was no difference in the total duration of SWS, but there were significantly fewer SWS episodes with the functional mattress (10.3 ± 1.8) than with the control mattress (16.9 ± 1.2) and longer SWS episode duration (10.9 ± 1.7 min) with the functional mattress than with the control mattress (5.6 ± 0.5 min). Conclusions It was suggested that the functional mattress lengthened SWS episode duration, and its fragmentation was effective in evaluating the sleep quality of healthy young individuals.
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Potential role of orexin and sleep modulation in the pathogenesis of Alzheimer’s disease
Roh, Jee Hoon,Jiang, Hong,Finn, Mary Beth,Stewart, Floy R.,Mahan, Thomas E.,Cirrito, John R.,Heda, Ashish,Snider, B. Joy,Li, Mingjie,Yanagisawa, Masashi,de Lecea, Luis,Holtzman, David M. The Rockefeller University Press 2014 The Journal of experimental medicine Vol.211 No.13
<P>Age-related aggregation of amyloid-β (Aβ) is an upstream pathological event in Alzheimer’s disease (AD) pathogenesis, and it disrupts the sleep–wake cycle. The amount of sleep declines with aging and to a greater extent in AD. Poor sleep quality and insufficient amounts of sleep have been noted in humans with preclinical evidence of AD. However, how the amount and quality of sleep affects Aβ aggregation is not yet well understood. Orexins (hypocretins) initiate and maintain wakefulness, and loss of orexin-producing neurons causes narcolepsy. We tried to determine whether orexin release or secondary changes in sleep via orexin modulation affect Aβ pathology. Amyloid precursor protein (APP)/Presenilin 1 (PS1) transgenic mice, in which the orexin gene is knocked out, showed a marked decrease in the amount of Aβ pathology in the brain with an increase in sleep time. Focal overexpression of orexin in the hippocampus in APP/PS1 mice did not alter the total amount of sleep/wakefulness and the amount of Aβ pathology. In contrast, sleep deprivation or increasing wakefulness by rescue of orexinergic neurons in APP/PS1 mice lacking orexin increased the amount of Aβ pathology in the brain. Collectively, modulation of orexin and its effects on sleep appear to modulate Aβ pathology in the brain.</P>
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