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Current status of the diagnosis of chronic pancreatitis by ultrasonographic elastography
( Kazunori Nakaoka ),( Senju Hashimoto ),( Ryoji Miyahara ),( Hiroki Kawashima ),( Eizaburo Ohno ),( Takuya Ishikawa ),( Takamichi Kuwahara ),( Hiroyuki Tanaka ),( Yoshiki Hirooka ) 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.1
Chronic pancreatitis (CP) is pathologically characterized by the loss of exocrine pancreatic parenchyma, irregular fibrosis, cellular infiltration, and ductal abnormalities. Diagnosing CP objectively is difficult because standard diagnostic criteria are insufficient. The change of parenchymal hardness is the key factor for the diagnosis and understanding of the severity of CP. The ultrasonography (US) or endoscopic ultrasonography (EUS) elastography have been used to diagnose pancreatic diseases. Both strain elastography (SE) and shear wave elastography are specific diagnostic techniques for measuring tissue hardness. Most previous studies were conducted with SE. There are three methods of interpreting SE; the method of recognizing the patterns in SE distribution images in the region of interest, the method of using strain ratio to compare the hardness of adipose tissue or connective tissue with that of the lesion, and the method of evaluating the hardness distribution of a target by histogram analysis. These former two methods have been used primarily for neoplastic diseases, and histograms analysis has been used to assess hardness distribution in the evaluation of CP. Since the hardness of the pancreas increases with aging, it is necessary to consider the age in the diagnosis of pancreatic disorders using US or EUS elastography.
Tribological Properties of Sintered Diamonds with WC-Co Matrix
Umeda, Kazunori,Tanaka, Akihiro,Takatsu, Sokichi The Korean Ceramic Society 1997 The Korean journal of ceramics Vol.3 No.3
Sintered diamond/(WC-Co) composites were prepared by spark plasma sintering technique. Tribological properties were measured at temperatures from RT to $500^{\circ}C$ in sliding tests with alumina ball. They show coefficient of friction of 0.1 and below at RT and wear of the diamond composites is hardly detected. Effects of diamond grit size, diamond content and test temperature on the coefficient of friction and the wear are discussed. The wear scars were analyzed.
Factors Associated with Early Hospital Arrival in Patients with Acute Ischemic Stroke
Song, Dongbeom,Tanaka, Eijirou,Lee, Kijeong,Sato, Shoichiro,Koga, Masatoshi,Kim, Young Dae,Nagatsuka, Kazuyuki,Toyoda, Kazunori,Heo, Ji Hoe Korean Stroke Society 2015 Journal of stroke Vol.17 No.2
<P><B>Background and Purpose</B></P><P>Factors associated with early arrival may vary according to the characteristics of the hospital. We investigated the factors associated with early hospital arrival in two different stroke centers located in Korea and Japan.</P><P><B>Methods</B></P><P>Consecutive patients with ischemic stroke arrived hospital within 48 hours of onset between January 2011 and December 2012 were identified and the clinical and time variables were retrieved from the prospective stroke registries of Severance Hospital of Yonsei University Health System (YUHS; Seoul, Korea) and National Cerebral and Cardiovascular Center (NCVC; Osaka, Japan). Subjects were dichotomized into early (time from onset to arrival ≤4.5 hours) and late (>4.5 hours) arrival groups. Univariate and multivariate analyses were performed to evaluate factors associated with early hospital arrival.</P><P><B>Results</B></P><P>A total of 1,966 subjects (992 from YUHS; 974 from NCVC) were included in this study. The median time from onset to arrival was 6.1 hours [interquartile range, 1.7-17.8 hours]. In multivariate analysis, the factors associated with early arrival were atrial fibrillation (Odds ratio [OR], 1.505; 95% confidence interval [CI], [1.168-1.939]), higher initial National Institute of Health Stroke Scale scores (OR, 1.037; 95% CI [1.023-1.051]), onset during daytime (OR, 2.799; 95% CI [2.173-3.605]), and transport by an emergency medical service (OR, 2.127; 95% CI [1.700-2.661]). These factors were consistently associated with early arrival in both hospitals.</P><P><B>Conclusions</B></P><P>Despite differences between the hospitals, there were common factors related to early arrival. Efforts to identify and modify these factors may promote early hospital arrival and improve stroke outcome.</P>
High-strength Soft Magnetic Composite with Self-lubricating Resin
Miyahara Masahisa,Tanaka Yoshihiro,Igarashi Kazunori,Morimoto Koichiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Improvement of the strength is one of the most important subjects on soft magnetic composite (SMC) to increase the applica ble items. In this study, lubricants for inner lubricating SMC, which can be produced in lower cost than die wall-lubricatin g SMC, varied to investigate their effect on the strength. The newly developed SMC with self-lubricating resin shows high st rength equivalent to that of SMC obtained by die wall lubrication.
Collimator Focus Adjustment for Free Space Optics System Using Single-mode Optical Fibers
Koichi Yoshida,Kuniaki Tanaka,Kazunori Katayama,Takeshi Tsujimura,Yuji Azuma 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a method for adjusting a free space optics (FSO) system that links two single-mode optical fibers (SMFs) using collimators. It operates as if the two SMFs were seamlessly connected without the need for any photoelectric devices. Collimator focusing as well as axis alignment is critical for low loss transmission and is performed using an opto-mechatronic system in the proposed method.
Effect of deflected inflow on flows in a strongly-curved 90 degree elbow
Iwamoto, Yukiharu,Kusuzaki, Ryo,Sogo, Motosuke,Yasuda, Kazunori,Yamano, Hidemasa,Tanaka, Masaaki Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.1
Wall pressure measurements and flow visualization were conducted for a 90 degree elbow with an axis curvature radius the same as its inner diameter (125 mm). Reynolds numbers 320,000 and 500,000, based on the inner diameter and bulk velocity, were examined. A deflected inflow, having an almost constant velocity slope and a faster velocity at the inside, was introduced. Ensemble averaged pressure distributions showed that no difference of normalized pressure could be found in both the Reynolds number cases. Power spectral density functions of pressures exhibited that the fluctuation having the Strouhal number (based on the inner diameter and bulk velocity) of 0.6 existed in the downstream region of the elbow, which was 0.1 larger than that of the uniform inflow case [1]. Results of numerical calculations qualitatively coincided with the experimental ones.
Effect of deflected inflow on flows in a stronglycurved 90 degree elbow
Yukiharu Iwamoto,Ryo Kusuzaki,Motosuke Sogo,Kazunori Yasuda,Hidemasa Yamano,Masaaki Tanaka 한국유체기계학회 2017 International journal of fluid machinery and syste Vol.10 No.1
Wall pressure measurements and flow visualization were conducted for a 90 degree elbow with an axis curvature radius the same as its inner diameter (125 mm). Reynolds numbers 320,000 and 500,000, based on the inner diameter and bulk velocity, were examined. A deflected inflow, having an almost constant velocity slope and a faster velocity at the inside, was introduced. Ensemble averaged pressure distributions showed that no difference of normalized pressure could be found in both the Reynolds number cases. Power spectral density functions of pressures exhibited that the fluctuation having the Strouhal number (based on the inner diameter and bulk velocity) of 0.6 existed in the downstream region of the elbow, which was 0.1 larger than that of the uniform inflow case [1]. Results of numerical calculations qualitatively coincided with the experimental ones.