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Evaluation of Reduction Effect in Traffic Accidents Based on Time Series Reliability Model
Ryota IIDA,Makoto MOCHIZUKI,Yoshiki NII,Dejan ORSAG,Keisuke SUZUKI,Kiichi YAMADA 대한인간공학회 2016 대한인간공학회 학술대회논문집 Vol.2016 No.06
In recent years, various kinds of research related to alarm systems which prevent traffic accidents has been reported. However, there are few which evaluated the effects of reducing driver’s reaction time during unpredictable risks on decreasing traffic accidents. In this study, a methodology for estimating the collision mitigation ratio is discussed, using a collision-prevention system that supplies aroma to drivers whose cognitive attentiveness has decreased due to a prolonged driving. First, we investigated driving action at intersections during use of the system in a driving simulator. The results showed that reaction time to the crossing vehicle was significantly reduced when a driver used the aroma-supplying collision-prevention system. In addition, a system that doesn’t supply aroma could cause a decrease in driver’s attentiveness. The Time Series Reliability Model, which is a driver-model considering the driver’s time-series cognitive status, is constructed and the collision mitigation ratio is estimated. The results suggested that the collision ratio increased during the use of a system that presents only information, since the driver depended on the system information and the driver’s safety confirmation actions were inhibited. Meanwhile, the collision ratio decreased during the use of the aroma-supplying system since reaction time to the crossing vehicle was reduced by an effect on stress reduction. It can be concluded that traffic accidents at intersections are reduced by using the aroma-supplying system.
Suzuki Tetsuya,Tsuji Osahiko,Ichikawa Masahiko,Ishii Ryota,Nagoshi Narihito,Kawakami Michiyuki,Watanabe Kota,Matsumoto Morio,Tsuji Tetsuya,Fujiwara Toshiyuki,Nakamura Masaya 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: This is a single-center retrospective cohort study with a university hospital setting.Purpose: This study aims to evaluate the short-term course of physical function and walking ability after intramedullary spinal cord tumor (ISCT) resection and predict walking independence 1 year after surgery.Overview of Literature: Although several reports have shown the postoperative functional prognosis of spinal intramedullary tumors with long-term follow-up, no reports have identified the predictors associated with the functional outcome at an early stage. Methods: A total of 79 individuals who underwent ISCT resection at our institute between 2014 and 2019 were enrolled in the study, whose preoperative walking state was independent ambulator regardless of cane support with the Functional Independence Measure Locomotor Scale (FIM-L) score of ≥6. The FIM-L, the American Spinal Injury Association (ASIA) motor and sensory scores in the lower extremities, and the Walking Index for Spinal Cord Injury II (WISCI II) were assessed for walking independence, lower-limb function, and walking ability, respectively. These evaluations were performed at 4 time points: preoperatively, 1 week (1W), 2 weeks (2W), and 1 year after surgery.Results: In the early phase after surgery, 71% and 43% of the participants were nonindependent ambulators at 1W and 2W, respectively. Histopathology indicated that patients with solid tumors (ependymoma, astrocytoma, or lipoma) showed significantly lower indices at 1W and 2W than those with vascular tumors (hemangioblastoma or cavernous hemangioma). Regarding tumor location, thoracic cases exhibited poorer lower-limb function at 1W and 2W and poorer walking ability at 2W than cervical cases. According to the receiver operating characteristic (ROC) analysis, 2 WISCI II points at 2W had the highest sensitivity (100%) and specificity (92.2%) in predicting the level of walking independence at 1 year postoperatively (the area under the ROC curve was 0.99 (95% confidence interval, 0.93–1.00).Conclusions: The higher the lower-limb function scores in the early phase, the better the improvement in walking ability is predicted 1 year after ISCT resection.
Toshio Suzuki,Ryota Akagi,Fumio Nanba,Shizuka Saito,Toshinari Maruo,Toshiya Toda,Yoko Yamashita,Hitoshi Ashida 한국식품영양과학회 2024 Journal of medicinal food Vol.27 No.2
Black soybean seed coat extract (BE) contains multiple bioactive polyphenols, including flavan-3-ols andanthocyanins. BE improves endothelial function; however, it is unclear whether BE protects endothelial cells from senescence. In this study, we examined the effects of BE on endothelial cell senescence and vascular function in healthy individuals. High concentrations of glucose were used to induce senescence in bovine aortic endothelial cells incubated with BE. Senescence, vascular function, and oxidative stress markers were measured. Incubation with BE remarkably inhibitedsenescence-associated b-galactosidase and lactate dehydrogenase activities and dose dependently reduced intracellular reactiveoxygen species levels in bovine aortic endothelial cells. BE treatment increased the levels of endothelial nitric oxidesynthase (eNOS) mRNA and endothelial nitric oxide (NO) metabolites and increased the mRNA expression of klotho, a geneassociated with an antiaging phenotype. To examine the effects of BE in humans, we conducted a clinical study using the secondderivative of the fingertip photoplethysmogram to investigate vascular function and aging in 24 healthy volunteers. The participantsconsumed BE supplements (100mg/day) or a placebo for 2 weeks. When compared with the placebo group, the BE groupshowed considerably improved vascular function, NO metabolite levels, and oxidative stress. These results suggest that BEsupplementation improves endothelial function, possibly through antioxidant activity and NO production, and may consequentlyreduce the cardiovascular risk associated with aging. BE supplementation may be an effective and safe approach to reduce the riskof atherosclerosis and cardiovascular disease; however, additional studies investigating chronic vascular inflammation are needed.
Development and Evaluation of Avionics for System Identification of Small UAVs
Masaru Naruoka,Takuma Hino,Ryota Nakagawa,Takeshi Tsuchiya,Shinji Suzuki 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
A new avionics tor system identification of small unmanned aerial vehicles (UAVs) is proposed in this paper. The proposed avionics consists of three parts: 1) MEMS INS/GPS navigation unit, 2) air data sensor, and 3) command logger. The accuracy and error models of the components are obtained experimentally with a prototype device, and the total performance is evaluated with Monte Carlo simulations which solve the longitudinal stability derivatives of a small UAV with the obtained error model. Furthermore, a real flight log obtained by the prototype device is analyzed. The results shows that the proposed avionics is accurate enough 10 analyze the flight characteristic of small UAVs with the system identification techniques.
( Taku Kobayashi ),( Tadakazu Hisamatsu ),( Yasuo Suzuki ),( Haruhiko Ogata ),( Akira Andoh ),( Toshimitsu Araki ),( Ryota Hokari ),( Hideki Iijima ),( Hiroki Ikeuchi ),( Yoh Ishiguro ),( Shingo Kato 대한장연구학회 2018 Intestinal Research Vol.16 No.2
Inflammatory bowel disease (IBD), including Crohn’s disease (CD) and ulcerative colitis (UC), is a chronic inflammatory disease of the gastrointestinal tract, with increasing prevalence worldwide. IBD Ahead is an international educational program that aims to explore questions commonly raised by clinicians about various areas of IBD care and to consolidate available published evidence and expert opinion into a consensus for the optimization of IBD management. Given differences in the epidemiology, clinical and genetic characteristics, management, and prognosis of IBD between patients in Japan and the rest of the world, this statement was formulated as the result of literature reviews and discussions among Japanese experts as part of the IBD Ahead program to consolidate statements of factors for disease prognosis in IBD. Evidence levels were assigned to summary statements in the following categories: disease progression in CD and UC; surgery, hospitalization, intestinal failure, and permanent stoma in CD; acute severe UC; colectomy in UC; and colorectal carcinoma and dysplasia in IBD. The goal is that this statement can aid in the optimization of the treatment strategy for Japanese patients with IBD and help identify high-risk patients that require early intervention, to provide a better long-term prognosis in these patients. (Intest Res 2018;16:168-177)
Tsuji Osahiko,Nagoshi Narihito,Ishii Ryota,Nori Satoshi,Suzuki Satoshi,Okada Eijiro,Fujita Nobuyuki,Yagi Mitsuru,Matsumoto Morio,Nakamura Masaya,Watanabe Kota 대한척추외과학회 2020 Asian Spine Journal Vol.14 No.6
Study Design: Single-center retrospective study.Purpose: We aimed to explore the postoperative prognostic factors for spinal intramedullary ependymoma.Overview of Literature: Ependymoma (World Health Organization grade II) is the most frequent intramedullary spinal tumor and is treated by total resection. However, postoperative deterioration of motor function occasionally occurs.Methods: Eighty patients who underwent surgical resection at Keio University and Fujita Health University in Tokyo, Japan between 2003 and 2015 with more than 2 years of follow-up were enrolled. A good surgical result was defined as an improvement in the modified McCormick Scale score by one grade or more or having the same clinical grade as was observed preoperatively. Meanwhile, a poor result was defined as a reduction in the McCormick Scale score of one grade or more or remaining in grade IV or V at final follow-up. Univariate and multivariate logistic regression analyses of the following factors were performed in the two groups: sex, age, preoperative Visual Analog Scale (VAS), tumor location, the extent of tumor resection, hemosiderin caps, cavity length, and tumor length on magnetic resonance imaging.Results: At final follow-up, 15 patients were included in the poor results group and 65 in the good results group. In the univariate analysis, the factors related to poor results were as follows: higher age, preoperative McCormick Scale score severity, higher preoperative VAS, thoracic location, hemosiderin capped, and non-gross total resection (GTR). A multiple logistic regression analysis was conducted and showed that age, worse preoperative McCormick Scale score, and non-GTR were significant factors for poor prognosis.Conclusions: The independent risk factors for motor deterioration after ependymoma resection were age, worse preoperative McCormick Scale score, and non-GTR. Early surgery for patients with even mild neurological disorders could facilitate functional outcomes. These results may contribute to determining the optimal timing of surgery for spinal intramedullary ependymoma.
X-Band GaN HEMT Advanced Power Amplifier Unit for Compact Active Phased Array Antennas
Yuusuke Yamashita,Taihei Nakada,Tsuyoshi Kumamoto,Ryota Suzuki,Masahiro Tanabe 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A compact power amplifier unit for X-band solid-state Active Phased Array Antennas (APAAs) has been developed. Its major features are, (1) high power GaN (Gallium Nitride) HEMT is employed, (2)16 transmit MICmodules are arrayed in line on a thin flat printed wiring board (PWB), (3) output power is 30W (pulse) at eachtransmit-output port of the unit, hence 480 W in total, and (4) other necessary functions for phased array antennas, such as digital phase-shifters and RF dividers, are all included in this PWB. Resulting electrical measured data are presented in detail in the paper, proving that further power and frequency range increase for APAAs would become feasible by the concepts employed in this unit design.