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Takuji Hikida,Masaru Yamaguchi,Mami Shimizu,Jun Kikuta,Tomokazu Yoshino,Kazutaka Kasai 대한치과교정학회 2016 대한치과교정학회지 Vol.46 No.4
Objective: Root mobility due to reciprocating movement of the tooth (jiggling) may exacerbate orthodontic root resorption (ORR). “Jiggling” describes mesiodistal or buccolingual movement of the roots of the teeth during orthodontic treatment. In the present study, buccolingual movement is described as “jiggling.” We aimed to investigate the relationship between ORR and jiggling and to test for positive cell expression in odontoclasts in resorbed roots during experimental tooth movement (jiggling) in vivo. Methods: Male Wistar rats were divided into control, heavy force (HF), optimal force (OF), and jiggling force (JF) groups. The expression levels of cathepsin K, matrix metalloproteinase (MMP)-9 protein, interleukin (IL)-6, cytokine-induced neutrophil chemoattractant 1 (CINC-1; an IL-8-related protein in rodents), receptor activator of nuclear factor κB ligand (RANKL), and osteoprotegerin protein in the dental root were determined using immunohistochemistry. Results: On day 21, a greater number of root resorption lacunae, which contained multinucleated odontoclasts, were observed in the palatal roots of rats in the JF group than in rats from other groups. Furthermore, there was a significant increase in the numbers of cathepsin K-positive and MMP-9-positive odontoclasts in the JF group on day 21. Immunoreactivities for IL-6, CINC-1, and RANKL were stronger in resorbed roots exposed to jiggling than in the other groups on day 21. Negative reactivity was observed in the controls. Conclusions: These results suggest that jiggling may induce ORR via inflammatory cytokine production during orthodontic tooth movement, and that jiggling may be a risk factor for ORR.
Airborne GPS Reflectometry from Low Altitude Aircraft
Takuji Ebinuma,Yasuda Akio,Dinesh Manandhar 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This work is intended to develop a software-defined Global Positioning System (GPS) receiver specifically designed to process reflected GPS signal off the ground or the ocean surface for purpose of remote sensing. A set of airborne campaign was conducted to evaluate the performance of the prototype GPS reflectometry receiver. The reflected signal was tracked in open-loop manner using the so called delay mapping receiver. The result shows that theprototype receiver was capable of providing altimetric measurements with a precision level of the order of few meterswith an unknown system bias which should be estimated.
Takuji Yamagami,Rika Yoshimatsu,Hiroshi Miura,Tomohiro Matsumoto,Terumitsu Hasebe 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.3
Objective: To determine the safety and usefulness of a two-tiered approach to balloon-occluded retrograde transvenous obliteration (B-RTO) as a treatment for large gastric varices after portal hypertension. Materials and Methods: 50 patients were studied who underwent B-RTO for gastric varices between October 2004 and October 2011 in our institution. The B-RTO procedure was performed from the right femoral vein and the B-RTO catheter was retained until the following morning. Distribution of sclerotic agents in the gastric varices on fluoroscopy was evaluated in all patients on days 1 and 2. When distribution of sclerotic agents in the gastric varices on day 1 had been none or very scanty even though the volume of the sclerotic agent infused was above the acceptable level, a second infusion was administered on day 2. When distribution was satisfactory, the B-RTO catheter was removed. Results: In 8 (16%) patients, little or no sclerotic agent infused on day 1 was distributed in the gastric varices. However, on day 2, sclerotic agents were distributed in all gastric varices. Mean volume of ethanolamine oleate-iopamidol infused on day 1 was 24.6 mL and was 19.4 mL on day 2. Gastric varices were well obliterated with no recurrence. Complications caused by the sclerotic agent such as pulmonary edema or renal insufficiencies were not seen. Conclusion: When gastric varices are very large, a strategy involving thrombosis of only the drainage vein on the first day followed by infusing the sclerotic agent on the following day might be effective and feasible.
Study on High Pressure Design of Contra-Rotating Small Hydroturbine
Takuji Hosotani,Toru Shigemitsu,Yuki Kawaguchi,Tomofumi Ikebuchi,Takeru Ishiguro 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.4
It is requested that the hydroturbine be a small size and have high performance. Therefore, we adopted contra-rotating rotors, which can be expected to achieve radial compactification and high performance. However, when the rotors become smaller, the output power of conventional contra-rotating rotors, which are composed of axial flow rotors, is low. In order to achieve small size, high performance and high output power simultaneously, we propose a new type of contra-rotating rotors, which are composed of a hybrid rotor and a centrifugal rotor. In the present paper, we focus on deflection angle of the hydroturbine composed of these rotors as a first step of this research, and investigate performance by the numerical analysis. As a result, we clarified that there is a possibility that even a negative deflection angle functions as a hydroturbine unlike the conventional contra-rotating rotors and leads to best performance.
Takuji Hosotani,Toru Shigemitsu,Yuki Kawaguchi,Takuya Inamoto,Takeru Ishiguro,Ding Nan 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.4
It is requested that the hydroturbine be a small size and have high performance. Therefore, we adopted contrarotating rotors, which can be expected to achieve radial compactification and high performance. However, a conventional contra-rotating rotor was composed of two axial flow rotors, so it had a specification suitable for high flow rate and low head. In order to achieve a small hydroturbine suitable for low flow rate and high head, we propose new type of contra-rotating rotors, which are composed of a hybrid rotor and a centrifugal rotor. In the present paper, we focus on the number of blades of the hydroturbine composed of these rotors as a first step of this research, and investigate performance by numerical analysis. As a result, it clarifies that the head of the front rotor is lowered due to the slip of the flow, and it has been confirmed that increasing the number of blades can suppress the slip of flow and improve the turbine head and the shaft power. Also, it clarifies that the shaft power of the rear rotor was almost unchanged even if the number of blades is changed, and that the meridional plane shape has a greater effect on the performance than the number of blades.