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Design and simulation of double-mass dynamic vibration absorber with residual vibration mode
Nanako Miura,Naoki Matsuo,Saiji Fukada,Sawako Tomioka 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.6
This paper presents a double-mass dynamic vibration absorber (DVA) that rapidly reduces the motion of the object to be damped (main system) and converts it to the motion of the DVA. In this way, the DVA attenuates the vibration of the main system. A DVA is usually designed to improve the resonance amplitude and convergence time of the main system vibration, and the kinetic energy of the main system is dissipated as heat in the damping element of the DVA. We describe a novel configuration consisting of two DVAs connected by a spring and an inerter. This new structure enables a rapid response reduction of the main system and residual vibration in the DVA. By tuning the responses of both the main system and the DVA, two vibration modes can be realized: a damping mode and a residual vibration mode. The proposed device is optimized using a genetic algorithm and applied to a bridge to demonstrate its performance.
Human Insecurity Caused by the Dysfunction of the State: New Security Issues in Post-Fukushima Japan
( Nanako Shimizu ) 서울대학교 통일평화연구원 2015 Asian Journal of Peacebuilding Vol.3 No.2
Controversial and insufficient post-accident measures implemented by the Japanese government after the Fukushima nuclear power plant accident in 2011 have caused prolonged anxieties over radiation. These anxieties resulted in multiple insecurities, including health, economic, food, environmental, community, personal, and political insecurities. The Fukushima disaster shows that threats to human security may come not only from the manifest “enemy” outside, but from “dysfunction of the state” supported by peoples` choices to sacrifice the victims for the sake of the interests of the “majority,” which is called a “sacrificial system.” At the same time, people are still patiently trying to restore their human security by means of voluntary actions.
Human Insecurity Caused by the Dysfunction of the State: New Security Issues in Post-Fukushima Japan
Nanako Shimizu 서울대학교 통일평화연구원 2015 Asian Journal of Peacebuilding Vol.3 No.2
Controversial and insufficient post-accident measures implemented by the Japanese government after the Fukushima nuclear power plant accident in 2011 have caused prolonged anxieties over radiation. These anxieties resulted in multiple insecurities, including health, economic, food, environmental, community, personal, and political insecurities. The Fukushima disaster shows that threats to human security may come not only from the manifest “enemy” outside, but from “dysfunction of the state” supported by peoples’ choices to sacrifice the victims for the sake of the interests of the “majority,” which is called a “sacrificial system.” At the same time, people are still patiently trying to restore their human security by means of voluntary actions.
Effects of diet before endurance exercise on hepcidin response in young untrained females
Nanako Hayashi,Aya Ishibashi,Kazushige Goto 한국운동영양학회 2018 Physical Activity and Nutrition (Phys Act Nutr) Vol.22 No.4
[Purpose] We examined the effects of diet before endurance exercise on hepcidin response in young untrained females. [Methods] Ten young untrained females [age: 20.6 ± 0.8 y, height: 157.5 ± 1.0 cm, weight: 54.4 ± 1.5 kg, and maximal oxygen uptake (VO2max): 35.9 ± 1.1 mL/kg/min] were involved in two experimental conditions with a crossover design. The two conditions were separated by approximately 1 month, and each condition was performed during the follicular phase. Subjects completed 60 min of pedaling at 65% of VO2max after consuming a meal (FED) or not consuming a meal (CON). Blood samples were collected before, immediately after, and 3 h after exercise. [Results] Serum ferritin levels before exercise did not differ between the two conditions (P > 0.05). Blood glucose and lactate levels were significantly elevated immediately after exercise only under the FED condition (P < 0.05). Serum iron levels were significantly elevated after exercise under both conditions. However, the plasma interleukin-6 and serum hepcidin levels were not significantly different 3 h after exercise under either condition (P > 0.05). [Conclusion] Consuming a meal before endurance exercise at moderate intensity did not affect exercise-induced hepcidin elevation in young untrained females.
Hayashi Nanako,Nagatsuka Haruna,Sato Mikako,Kazushige Goto 한국운동영양학회 2023 Physical Activity and Nutrition (Phys Act Nutr) Vol.27 No.2
[Purpose] Exercise-induced hemolysis, which is caused by metabolic and/or mechanical stress during exercise, is considered a potential factor for upregulating hepcidin. Intramuscular carnosine has multiple effects including antioxidant activity. Therefore, this study aimed to determine whether long-term carnosine/ anserine supplementation modulates exercise-induced hemolysis and subsequent hepcidin elevation. [Methods] Seventeen healthy male participants were allocated to two different groups: participants consuming 1,500 mg/day of carnosine/anserine supplements (n = 9, C+A group) and participants consuming placebo powder supplements (n = 8, PLA group). The participants consumed carnosine/anserine or placebo supplements daily for 30.7 ± 0.4 days. They performed an 80-running session at 70% V4 O pre-and 2peak post-supplementation. Iron regulation and inflammation in response to exercise were evaluated. [Results] Serum iron concentrations significantly increased after exercise (p < 0.01) and serum haptoglobin concentrations decreased after exercise in both groups (p < 0.01). No significant differences in these variables were observed between pre-and post-supplementation. Serum hepcidin concentration significantly increased 180 min after exercise in both groups (p < 0.01). The integrated area under the curve of hepcidin significantly decreased after supplementation (p = 0.011) but did not vary between the C+A and PLA groups. [Conclusion] Long-term carnosine/anserine supplementation does not affect iron metabolism after a single endurance exercise session.
Thang Pham Huu,Nanako Miura,Daisuke Iba 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.4
This paper discusses the advantages of the multi active tuned mass dampers (MATMD) for vibration control of multi-degree-freedom structures and their distribution masses. The 11-story building having two ATMDs at different story and different ATMD mass under long and short period earthquakes is considered. A structural system with ATMDs using fuzzy logic control was simulated against the ground motion of the earthquakes. The time history of the story displacements and accelerations, and the frequency responses of both the uncontrolled and controlled structures are shown in this study to investigate the effectiveness of multiple ATMDs compared with single ATMD and distributed multiple tuned mass dampers (d-MTMDs). The gained results also present the effect of mass distribution of two ATMDs and their location on the building response that the distributed MATMD with same mass has better performance than the distributed MATMD with different mass and single ATMD in the most earthquake cases.
Ogawa, Atsushi,Taguchi, Nanako,Miyoshi, Kazumitsu The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.2
We used a flow cytometer to investigate the variations in endopolyploidy (the frequencies of nuclei with DNA contents equivalent to 4C through 16C) during the short period of the early growing stage in vigorously growing young tissues of maize seedlings. We examined different portions of the root and leaves that had been growing for 7 (day 7) and 13 (day 13) days after germination. Endoreplication showed two opposing phenomena without aging. In one case, the endopolyploidy of the first leaf was higher on day 13 than on day 7. In the latter case, endopolyploidy decreased, as clearly revealed by a comparison of the endopolyploidy of the second leaves and the 160-170 mm portion of the seminal root on days 7 and 13. Endopolyploidy was also lower in the top of the leaf. In roots, endopolyploidy was increased by the exogenous application of abscisic acid for only 1 day. The levels of endopolyploidy increased without an increase in cell size in the roots. These results showed that endoreplication occurs in actively growing and young tissue and that the variation can be induced in the short period examined.