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Satoru Kato,Hironobu Ozeki,Hiroshi Yamada,Tomohiko Tagawa,Naoki Takahashi,Hirofumi Shinjoh 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
A method for directly measuring gas diffusivity in a washcoat layer was established by preparing a simulated washcoat layer and modifying a Wicke–Kallenbach type counter-current diffusion cell. Three pairs of gases, N2–Ar, CO2–Ar and C3H8–Ar, were used in the measurements. It was found to be possible to evaluate the pore-transport parameters of the washcoat layer based on the mean transport pore model and the modified Stefan–Maxwell equation. Analysis of the gas diffusion mechanism in the washcoat layer showed that bulk and Knudsen diffusion took place simultaneously, and the percentage value of the contribution by Knudsen transport to net diffusion transport was evaluated.
Satoru Kikuchi,Tetsushi Kubota,Shinji Kuroda,Masahiko Nishizaki,Shunsuke Kagawa,Hironari Kato,Hiroyuki Okada,Toshiyoshi Fujiwara 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.4
Endoscopic ultrasound (EUS)-guided transgastric drainage has been performed as a less invasive procedure for pancreatic fistulasand intra-abdominal abscesses occurring after surgery in recent years. However, there are no reports of EUS-guided transgastricdrainage of intra-abdominal abscesses following gastrectomy. This case report describes 2 patients who developed an intra-abdominalabscess following gastrectomy and underwent EUS-guided transgastric drainage. Both patients underwent laparoscopy-assisted distalgastrectomy with Billroth-I reconstruction for gastric cancer. The intra-abdominal abscesses were caused by postoperative pancreaticfistula that developed following gastrectomy. One patient underwent naso-cystic drainage and the other underwent only a needlepuncture of the abscess cavity. EUS-guided drainage was performed safely and effectively, although 1 patient developed gastroduodenalanastomotic leakage related to this procedure. In summary, EUS-guided transgastric drainage is safe and technically feasible evenin post-gastrectomy patients. However, it is necessary to be careful if this procedure is performed in the early period followinggastrectomy.
Collecting Plant Floor Data using Agent Embedded in Controller
Satoru Hori,Hiromitsu Kato,Hiroshi Fujii,Seiichi Shin 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In the industrial and robotic fields, equipment manufacturers and system vendors have engaged instandardization activities in order to guarantee interconnection and interoperation and improve productivity andcompetitiveness. Recently, more system flexibility and cost efficiency than before have become necessary due to theintensity of market competition and diversity of customer needs. In plant-floor systems, the need for total costownership reduction has been growing. To meet this need, Japanese organizations use the concept of “Mieruka”, i.e.,visualization, to share and utilize information by making it visible in an easily understandable form. To achieve“Mieruka”, we need to be able to utilize plant-floor level data by flexibly collecting and seamlessly handling the datafrom various devices. We describe our standardization activities in the industrial field, propose a plant-floor level datacollection method using an agent embedded in a controller to flexibly collect data, and discuss an application of thestandardized data model interface that we previously proposed, Super Distributed Objects (SDO), to utilize collecteddata.
Effect of Opening on the Shear Behavior of Granular Materials in Direct Shear Test
김병수,Satoru Shibuya,박성완,Shoji Kato 대한토목학회 2012 KSCE Journal of Civil Engineering Vol.16 No.7
This paper examines the effect of the opening between the shear boxes on the shear behavior in the direct shear box test (H=20 mm×D=60 mm) under a constant vertical stress using seven types of granular material. It is observed that the magnitude of shear strength and dilatancy decreases due to the outflow of sample with an increase in the opening. The two notions of the Threshold Point (TP) as the limit opening size and the Threshold Line (TL) offering the guideline of opening size is defined according to the mean particle size of soil samples. However, similar shear behaviors were observed regardless of the opening size because there was no outflow of sample through applying the Teflon sheet in the direct shear box tests for Toyoura sand. Finally, the shear mode on the circular specimen applying the Teflon sheet is also examined in comparison with the results from other tests.
Satoshi Kato,Satoru Demura,Yuki Kurokawa,Naoki Takahashi,Kazuya Shinmura,Noriaki Yokogawa,Noritaka Yonezawa,Takaki Shimizu,Ryo Kitagawa,Hiroyuki Tsuchiya 대한재활의학회 2020 Annals of Rehabilitation Medicine Vol.44 No.3
Objective To examine the efficacy and safety of an innovative, device-driven abdominal trunk muscle strengthening program, with the ability to measure muscle strength, to treat chronic low back pain (LBP) in elderly participants. Methods Seven women with non-specific chronic LBP, lasting at least 3 months, were enrolled and treated with the prescribed exercise regimen. Patients participated in a 12-week device-driven exercise program which included abdominal trunk muscle strengthening and 4 types of stretches for the trunk and lower extremities. Primary outcomes were adverse events associated with the exercise program, improvement in abdominal trunk muscle strength, as measured by the device, and improvement in the numerical rating scale (NRS) scores of LBP with the exercise. Secondary outcomes were improvement in the Roland-Morris Disability Questionnaire (RDQ) score and the results of the locomotive syndrome risk test, including the stand-up and two-step tests. Results There were no reports of increased back pain or new-onset abdominal pain or discomfort during or after the device-driven exercise program. The mean abdominal trunk muscle strength, NRS, RDQ scores, and the stand-up and two-step test scores were significantly improved at the end of the trial compared to baseline. Conclusion No participants experienced adverse events during the 12-week strengthening program, which involved the use of our device and stretching, indicating the program was safe. Further, the program significantly improved various measures of LBP and physical function in elderly participants.
Strong Enhancement of Superconductivity in Inorganic Electride 12CaO·7Al2O3:e− under High Pressure
Shigeki Tanaka,Tomoki Kato,Atsushi Miyake,Tomoko Kagayama,Katsuya Shimizu,Sung Wng Ki,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We present the results of the pressure dependence of the superconductivity of the inorganicelectride 12CaO·7Al2O3:e− (C12A7:e−) single crystal through the ac-susceptibility measurementunder high pressure. C12A7:e− has the cage structure and the density of states derived fromthe cages may play an important role in the superconductivity. The superconducting transitiontemperature (Tc) is 0.2 K at ambient pressure and monotonically increases up to 1.79 K at4.7 GPa. The upper critical field Hc2 and −dHc2/dT at Tc, in proportion to the density of states(DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e− ismediated by the electron-phonon interaction, and the increase of Tc with pressure may arise froma peak structure of the DOS of cage conduction band.
Gas diffusion in an automotive catalyst in an unsteady state
Hiroshi Yamada,Tomohiko Tagawa,Satoru Kato,Naoki Takahashi 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-
The influence of gas diffusion is often ignored because the washcoat layer is thin. Therefore, in addition todeveloping new catalytic materials, modifying the washcoat pores is important for improving effectivegas diffusivity. The gas diffusion phenomena in an unsteady state in an experimentally simulated washcoatlayer were evaluated by the pulse injection method. Wicke–Kallenbach diffusion cell was used. Effective diffusion coefficients obtained in an unsteady state were compared to those obtained in a steadystate. The effective diffusion coefficients were similar to the values obtained under a steady state, exceptfor low-molecular-weight gasses, due to the difference in mean molar speed between the evaluating gasand atmospheric gas.
Invasiveness Reduction of Recent Total En Bloc Spondylectomy: Assessment of the Learning Curve
Takayoshi Ishii,Hideki Murakami,Satoru Demura,Satoshi Kato,Katsuhito Yoshioka,Moriyuki Fujii,Takashi Igarashi,Hiroyuki Tsuchiya 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.3
Study Design: Case-control study. Purpose: To evaluate the surgical magnitude and learning curve of “second-generation” total en bloc spondylectomy (TES). Overview of Literature: In June 2010, we developed second-generation TES combined with tumor-induced cryoimmunology, which does not require autograft harvesting. Methods: TES was performed in 63 patients between June 2010 and September 2013. Three groups of patients were evaluated: 20 undergoing surgery in the first year of development of second-generation TES (group I), 20 in the second year (group II), and 23 in the third year (group III). Patient backgrounds showed no remarkable differences. Operating time, intraoperative blood loss, blood transfusion, and postoperative C-reactive protein and creatine phosphokinase were compared among the groups. Results: Mean±standard deviation operating time was 486±130 minutes in group I, 441±85 minutes in group II, and 396±75 minutes in group III. The time was significantly shorter in group III than in group I (p <0.05). Intraoperative blood loss was 901±646 mL in group I, 433±177 mL in group II, and 411±167 mL in group III. Blood loss was significantly lower in groups II and III than in group I (p <0.01). Transfusion was not required in 20 of 23 patients in group III, and mean C-reactive protein levels on postoperative day 3 were significantly lower in this group than in group I (6.12 mg/L vs. 10.07 mg/L; p <0.05). Postoperative creatine phosphokinase levels did not differ among the groups. Conclusions: TES is associated with a significant learning curve. Thus, second-generation TES can no longer be considered highly invasive.