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Plastic Deformation Capacity of Steel Beam-to-Column Connection under Long-duration Earthquake
Yamada, Satoshi,Jiao, Yu,Narihara, Hiroyuki,Yasuda, Satoshi,Hasegawa, Takashi Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.3
Ductile fracture is one of the most common failure modes of steel beam-to-column connections in moment resisting frames. Most proposed evaluation methods of the plastic deformation capacity of a beam until ductile fracture are based on steel beam tests, where the material's yield strength/ratio, the beam's moment gradient, and loading history are the most important parameters. It is impossible and unpractical to cover all these parameters in real tests. Therefore, a new attempt to evaluate a beam's plastic deformation capacity through analysis is introduced in this paper. Another important issue is about the loading histories. Recent years, the effect on the structural component under long-duration ground motion has drawn great attentions. Steel beams tends to experience a large number of loading cycles with small amplitudes during long-duration earthquakes. However, current research often focuses on the beam's behavior under standard incremental loading protocols recommended by respective countries. In this paper, the plastic deformation capacity of steel beams subjected to long duration ground motions was evaluated through analytical methodology.
Satoshi Sugino,Ken Inoue,Reo Kobayashi,Ryohei Hirose,Toshifumi Doi,Akihito Harusato,Osamu Dohi,Naohisa Yoshida,Kazuhiko Uchiyama,Takeshi Ishikawa,Tomohisa Takagi,Hiroaki Yasuda,Hideyuki Konishi,Yasuko 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.4
Background/Aims Several studies have assessed the effect of cool temperature on colonic peristalsis. Transient receptor potential melastatin 8 (TRPM8) is a temperature-sensitive ion channel activated by mild cooling expressed in the colon. We examined the antispasmodic effect of cool temperature on colonic peristalsis in a prospective, randomized, single-blind trial and based on the video imaging and intraluminal pressure of the proximal colon in rats and TRPM8-deficient mice. Methods In the clinical trial, we randomly assigned a total of 94 patients scheduled to undergo colonoscopy to 2 groups: the mildly cool water (n = 47) and control (n = 47) groups. We used 20 mL of 15°C water for the mildly cool water. The primary outcome was the proportion of subjects with improved peristalsis after treatment. In the rodent proximal colon, we evaluated the intraluminal pressure and performed video imaging of the rodent proximal colon with cool water administration into the colonic lumen. Clinical trial registry website (Trial No. UMIN-CTR; UMIN000030725). Results In the randomized controlled trial, after treatment, the proportion of subjects with no peristalsis with cool water was significantly higher than that in the placebo group (44.7% vs 23.4%; P < 0.05). In the rodent colon model, cool temperature water was associated with a significant decrease in colonic peristalsis through its suppression of the ratio of peak frequency (P < 0.05). Cool temperature-treated TRPM8-deficient mice did not show a reduction in colonic peristalsis compared with wild-type mice. Conclusion For the first time, this study demonstrates that cool temperature-dependent suppression of colonic peristalsis may be associated with TRPM8 activation.
How to Avoid Severe Incidents at Hydropower Plants
Yasuda, Masashi,Watanabe, Satoshi Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.3
Hydropower is now changing its role from the energy generator into the most powerful and reliable tool for stabilizing the electrical network, especially under the increase of intermittent power sources like wind-power and solar-power. Although the hydropower plants are the most robust generating facilities, they are not immune from unexpected severe incidents having long downtime, considerable restoration cost and sometimes fatalities. The present paper provides some study results about severe incidents in the conventional hydropower plants, mainly about the flood, fire and electro-mechanical troubles, except for the incidents of civil facilities. It also provides some possible scenarios which may lead some measures how to avoid such incidents. Finally, it provides some comprehensible recommendations to avoid severe incidents based on experiences.
How to Avoid Severe Incidents at Hydropower Plants
Masashi Yasuda,Satoshi Watanabe 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.3
Hydropower is now changing its role from the energy generator into the most powerful and reliable tool for stabilizing the electrical network, especially under the increase of intermittent power sources like wind-power and solar-power. Although the hydropower plants are the most robust generating facilities, they are not immune from unexpected severe incidents having long downtime, considerable restoration cost and sometimes fatalities. The present paper provides some study results about severe incidents in the conventional hydropower plants, mainly about the flood, fire and electromechanical troubles, except for the incidents of civil facilities. It also provides some possible scenarios which may lead some measures how to avoid such incidents. Finally, it provides some comprehensible recommendations to avoid severe incidents based on experiences.
Shintaro Honda,Satoshi Ota,Shinnosuke Yamashita,Tadashi Yasuda 대한골다공증학회 2022 Osteoporosis and Sarcopenia Vol.8 No.1
Objectives: Fragility fractures of the pelvis (FFP) commonly occur in the frail elderly. Displacement in the posterior pelvic ring is recognized as the key sign of instability. This study aims to elucidate the relationship between computer tomography (CT)-based frailty markers and displacement of the posterior pelvic ring within 7 days after injury. Methods: This retrospective study included 49 patients (42 females, 7 males) with FFP (type I 10, type II 24, type III 12, type IV 3). On a CT slice at the level of the third lumbar vertebra, skeletal muscle area, skeletal muscle radiation attenuation, and skeletal muscle index (SMI) were calculated as sarcopenia markers. Osteopenia was measured with trabecular region of interest attenuation technique on the same CT slice. Results: There was no difference in the demographics between non-displaced and displaced FFP. CT-based data showed that patients with FFP had osteopenia. However, no difference was found between non-displaced and displaced FFP. SMI was higher in FFP types III/IV than non-displaced FFP when CT-based data on sarcopenia were compared among all patients. Female patients with FFP demonstrated similar results. Logistic regression analysis using the demographics and CT-based markers on sarcopenia and osteopenia revealed that SMI was a potential determinant of displacement of the posterior pelvic ring fractures. Conclusions: There was inverse association between sarcopenia and displacement of the posterior pelvic ring in the early phase of FFP. Relatively preserved muscle may develop displacement in the elderly with osteopenia.
Impact of Surgery on Oligometastatic Pancreatic Cancer: Current Status and Future Perspectives
Masayuki Sho,Satoshi Yasuda,Minako Nagai,Kota Nakamura,Taichi Terai,Yuichiro Kohara 대한소화기암연구학회 2023 Journal of Digestive Cancer Research (JDCR) Vol.11 No.1
Pancreatic cancer treatment has advanced. In particular, effective chemotherapy regimendevelopment has fundamentally altered the therapeutic concept and strategy for pancreaticcancer treatment. Consequently, the prognosis of patients with pancreatic cancer has graduallyimproved. Conversion surgery for locally advanced pancreatic cancer may offer long-term survival or even a full recovery in some individuals. In contrast, metastatic pancreatic cancer haslong been considered a surgical contraindication because aggressive surgical resection of themetastatic lesions does not prolong patient survival. Unexpectedly positive benefits of anticancer therapy in recent clinical experience were observed even with metastatic pancreatic cancer. To date, little evidence presented the success of surgical resection for metastatic pancreatic cancer treatment in such rare cases. However, hope and concern are growing that surgical intervention, even in patients with metastatic cancer, may result in favorable outcomes. Several studiessuggested different surgical intervention effects depending on metastasis sites and patterns. Thus, this review summarizes the current status of surgery in the multidisciplinary treatment ofoligometastatic pancreatic cancer and discusses future perspectives.
Harumi Kobayashi,Tetsuya Yasuda,Satoshi Suzuki 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2006 International Journal of Assistive Robotics and Me Vol.7 No.1
Two studies report the physiological signals of brain and hand that change as a human develops one"s manipulative skills. In Study 1, we investigated the activation of the brain in Brodmann"s area 46 of the frontal lobe in drawing tasks to examine whether Near-Infrared Spectroscopy (NIRS) can measure the changes of the DLPFC (dorsolateral prefrontal cortex) activation as a human develops motor skills. Participants performed a mirror drawing task and a square drawing task using their non-dominant hand. The change in oxy-Hb concentration decreased as the participant repeated the drawing task in most participants, suggesting that the activation of DLPFC decreases when a human develops manipulative skills. In Study 2, we investigated the phenomenon of micro?slips or non-smooth hand movements in relation to humans" skill development in coffee making. Seven right-handed participants were asked to make coffee ten times consecutively by their left hand. Each micro-slip was coded about its severity with a 5-point-scale and total frequency and a micro-slip score were calculated that we defined as the sum of micro-slip level multiplied by frequency for observed micro-slips in each cup of coffee. Results showed that frequency and micro-slip score decreased when the participants developed the coffee- making skills. We also tried to detect micro-slips by a physical measurement method of analyzing hand"s acceleration data. We showed that time-frequency characteristics of hand"s acceleration show characteristic patterns when micro-slips occur. Based on these results, we presented that physiological signals show characteristic changes as humans develop manipulative skills and suggest that such data could be a useful source of information for construction of human adaptive mechatronics (HAM).