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Tatsuya Funaki,Tomonori Kato,Kenji Kawashima,Toshiharu Kagawa 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In industry, an unsteady flow rate measurement of gases is becoming important increasingly. Our group has been developed an unsteady flow generator with an isothermal chamber for gases and showed that the calibration of the dynamic characteritics for the tested flow meter was effective. However, not only the measurement of the instantaneous flow rate value but also the evaluation of the time mean value in the unsteady flow becomes important in inustry. And it was difficult to control precisely the time mean value of the generated flow rate using the former unsteady flow generator which we developed. To solve this problem,our group developed an oscillatory gas flow generator with highly preciseinlet flow control system in 2008. In this research, to improve and clarify the precision of the generated flow rate with the oscillatory gas flow generator, we conduct to evaluate the performance of the in let flow rate control system with the sonic nozzle and the high precise pressure regulator. As a result, the highre producible results and stability were shown. Moreover, we perform the experiments and uncertainty analysis and confirm the effective of the suggested method.
Hypoglossal Nerve Palsy as a Complication of an Anterior Approach for Cervical Spine Surgery
Tatsuya Yasuda,Daisuke Togawa,Tomohiko Hasegawa,Yu Yamato,Sho Kobayashi,Hideyuki Arima,Yukihiro Matsuyama 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.2
A recurrent laryngeal nerve injury is known as a complication referring to an anterior cervical spine surgery. However, hypoglossal nerve injury is not well known yet. Herein we report a rare case of a 39-years-old male with a hypoglossal nerve injury after C3/4 osteophyte resection with Smith-Robinson approach. In this case there appeared difficulties of articulation and tongue movement with deviation of the tongue to the left side after the surgery and we diagnosed a hypoglossal nerve injury due to retraction against the nerve during the operation. During the operative approach to the upper cervical spine we had to retract the internal carotid artery and the soft tissue to reach the vertebrae. This retract was the cause of the hypoglossal nerve injury. A gently traction and intermittent release is important to avoid a hypoglossal nerve damage.
Regenerative capacity of augmented bone in rat calvarial guided bone augmentation model
Tatsuya Kubota,Akira Hasuike,Yasumasa Ozawa,Takanobu Yamamoto,Katsuyoshi Tsunori,Yutaka Yamada,Shuichi Sato 대한치주과학회 2017 Journal of Periodontal & Implant Science Vol.47 No.2
Purpose: Guided bone regeneration (GBR) is the most widely used technique to regenerate and augment bones. Even though augmented bones (ABs) have been examined histologically in many studies, few studies have been conducted to examine the biological potential of these bones and the healing dynamics following their use. Moreover, whether the bone obtained from the GBR procedure possesses the same functions as the existing autogenous bone is uncertain. In particular, little attention has been paid to the regenerative ability of GBR bone. Therefore, the present study histologically evaluated the regenerative capacity of AB in the occlusive space of a rat guided bone augmentation (GBA) model. Methods: The calvaria of 30 rats were exposed, and plastic caps were placed on the right of the calvaria in 10 of the 30 rats. After a 12-week healing phase, critical-sized calvarial bone defects (diameter: 5.0 mm) were trephined into the dorsal parietal bone on the left of the calvaria. Bone particles were harvested from the AB or the cortical bone (CB) using a bone scraper and transplanted into the critical defects. Results: The newly generated bone at the defects' edge was evaluated using micro-computed tomography (micro-CT) and histological sections. In the micro-CT analysis, the radiopacity in both the augmented and the CB groups remained high throughout the observational period. In the histological analysis, the closure rate of the CB was significantly higher than in the AB group. The numbers of cells positive for runt-related transcription factor 2 (Runx2) and tartrate-resistant acid phosphatase (TRAP) in the AB group were larger than in the CB group. Conclusions: The regenerative capacity of AB in the occlusive space of the rat GBA model was confirmed. Within the limitations of this study, the regenerative ability of the AB particulate transplant was inferior to that of the CB particulate transplant.
A Study on SLAM for Indoor Blimp with Visual Markers
Tatsuya Yamada,Takehisa Yairi,Suay Halit Bener,Kazuo Machida 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The simultaneous localization and mapping (SLAM) is an essential capability for mobile robots traveling in unknown environments where globally accurate position data is not available. In this paper, we address the SLAM problem of indoor toy blimp that has no sensors such as accelerometers and gyro except a micro camera because of the weight limits. Since it is difficult to determine the exact motion models preliminarily, we assume the motion models of the blimp. The goal of this paper is to construct a 3D map of the landmarks in environment and estimate the path taken by the indoor blimp. In this paper, we use visual markers as the landmarks, since it is difficult to detect features of the landmarks. We propose the approach to SLAM using Extended Kalman Filter (EKF) and verify the effectiveness of this approach by the experiments.
Suction Performance and Cavitation Instabilities of Turbopumps with Three Different Inducer Design
Tatsuya Morii,Yohei Tanaka,Satoshi Watanabe,Satoru Ohashi,Yasushi Matsunaga 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.2
In the present study, the suction performance and the cavitation instabilities in turbo-pumps with three different inducers designed with different design incidence angle are experimentally investigated in the wide range of operating flow rate. Three inducers L with the lowest design incidence angle, M with the moderate one and H with the largest one are used in combination with identical main impeller. As a result, the total head of pump with inducer H is confirmed to be the largest especially at large flow rates, while the shaft power is almost the same, resulting in the best efficiency with the inducer H. The suction performance is the best with inducer H at large flow rates and is the best with inducer L at low flow rates. Two kinds of instabilities, the cavitating whirling vortex and the surges are mainly observed for the all both inducers, but they are limited at low flow rates. The occurrence ranges of these instabilities in terms of the operating flow rate is the widest with inducer H. However, those in terms of the shockless flow rate ratio is similar for the all three inducers: This fact can contribute to establish some guideline to the pump operation avoiding serious flow instabilities.
( Tatsuya Hayashi ),( Satoshi Saitoh ),( Kei Fukuzawa ),( Yoshinori Tsuji ),( Junji Takahashi ),( Yusuke Kawamura ),( Norio Akuta ),( Masahiro Kobayashi ),( Kenji Ikeda ),( Takeshi Fujii ),( Tosiaki M 대한간학회 2017 Gut and Liver Vol.11 No.5
Background/Aims: Noninvasive liver fibrosis evaluation was performed in patients with nonalcoholic fatty liver disease (NAFLD). We used a quantitative method based on the he-patic volume acquired from gadoxetate disodium-enhanced (Gd-EOB-DTPA-enhanced) magnetic resonance imaging (MRI) for diagnosing advanced fibrosis in patients with NAFLD. Methods: A total of 130 patients who were diagnosed with NAFLD and underwent Gd-EOB-DTPA-enhanced MRI were retrospectively included. Histological data were available for 118 patients. Hepatic volumetric parameters, including the left hepatic lobe to right hepatic lobe volume ratio (L/R ratio), were measured. The usefulness of the L/R ratio for diag-nosing fibrosis ≥F3-4 and F4 was assessed using the area under the receiver operating characteristic (AUROC) curve. Multiple regression analysis was performed to identify vari-ables (age, body mass index, serum fibrosis markers, and histological features) that were associated with the L/R ratio. Results: The L/R ratio demonstrated good performance in differentiating advanced fibrosis (AUROC, 0.80; 95% confi-dence interval, 0.72 to 0.88) from cirrhosis (AUROC, 0.87; 95% confidence interval, 0.75 to 0.99). Multiple regression analysis showed that only fibrosis was significantly associat-ed with the L/R ratio (coefficient, 0.121; p<0.0001). Conclu-sions: The L/R ratio, which is not influenced by pathologi-cal parameters other than fibrosis, is useful for diagnosing cirrhosis in patients with NAFLD. (Gut Liver 2017;11:674- 683)