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- 저자 : Hidetoshi Suzuki (검색결과 6 건)
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Properties of Chemical Beam Epitaxy grown GaAs0.995N0.005 homo-junction solar cell
Boussairi Bouzazi,Kenichi Nishimura,Hidetoshi Suzuki,Nobuaki Kojima,Yoshio Ohshita,Masafumi Yamaguchi 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The minority carrier diffusion length in Chemical Beam Epitaxy (CBE) grown GaAs0.995N0.005 based homojunction solar cell was estimated and found to be L = 0.08 lm. In addition, the majority carrier traps in Nvarying unintentionally doped p-type GaAsN samples grown by CBE were investigated using Deep Level Transient Spectroscopy (DLTS) technique. Five hole traps, HC1–HC5, were detected, where HC2 and HC5coexist in all samples. These two hole traps were suggested to be a N-related defect and the double donor state of EL2, respectively.
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Department of Neurosurgery, Dhaka Medical College Hospital, Dhaka, Bangladesh
Kenji Endo,Hidekazu Suzuki,Hirosuke Nishimura,Hidetoshi Tanaka,Takaaki Shishido,Kengo Yamamoto 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.6
Study Design: Normal cervical sagittal length patterns were measured by magnetic resonance imaging (MRI). Purpose: The aim of this study was to evaluate the relationship of sagittal length patterns between the cervical cord and the cervical canal in flexion-extension kinematics. Overview of Literature: Cervical dynamic factors sometimes cause a cervical spondylotic myelopathy in elderly subjects and an overstretching myelopathy in juvenile subjects. Previous studies showed the length changing of the cervical cord in flexion and extension. However, there is no detailed literature about the relationship between cervical vertebral motion and cord distortion yet. Methods: Sixty-two normal subjects (28 male and 34 female, 42.1±8.5 years old) without neck motion disturbances and abnormalities on cervical X-ray and MRI were enrolled in this study. Results: The cervical cord length was significantly longer in flexion and significantly shorter in extension in all cervical cord sagittal lines. The cervical canal length pattern was also the same as the cervical cord. The elongation of the cervical cord and canal was the largest at the site of the posterior cervical canal and the shortest at the anterior canal site. The positions of the cerebellar tonsils were verified at each neck position. Conclusions: The posterior elements of the cervical canal were most affected by neck motion. Movement directions of the upper cervical cord were verified among the various neck positions.
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Relation between N–H complexes and electrical properties of GaAsN determined by H implantation
Jong-Han Lee,Hidetoshi Suzuki,Xiuxun Han,Katahiko Honda,Tomohiro Tanaka,Jong-Ha Hwang,Boussairi Bouzazi,Makoto Inagaki,Nobuaki Kojima,Yoshio Ohshita,Masafumi Yamaguchi 한국물리학회 2010 Current Applied Physics Vol.10 No.3
We investigated the relation between N–H complexes and the electrical properties of GaAsN, which is a potential material for fabricating super-high-efficiency multi-junction tandem solar cells. In order to separate the effect of other residual carrier such as carbon in a GaAsN film on the electrical properties, hydrogen (H) ions were implanted into GaAsN grown by chemical beam epitaxy (CBE) and then rapid thermal annealing from 250 to 650 ℃ was carried out. Two N–H complexes related to local vibrational modes (LVMs) in GaAsN were observed at 3098 and 3125 cm-1. With an increasing annealing temperature,the integrated peak intensity of the 3098 cm-1 peak (I3098) decreased, while that of the 3125 cm-1 peak (I3125) increased. This indicates that N–H complexes related to the 3125 cm-1 peak are thermally more stable than those related to the other peak. The hole concentrations and mobilities exhibited an increasing trend until an annealing temperature of 550 ℃ was reached. Their increases are attributed to the removal of donor-type defects. It is suggested that the N–H complexes related to the 3098 cm-1 peak are electrically active, while those giving the 3125 cm-1 peak are inactive.
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Characteristics of Sagittal Spino-Pelvic Alignment in Japanese Young Adults
Kenji Endo,Hidekazu Suzuki,Hirosuke Nishimura,Hidetoshi Tanaka,Takaaki Shishido,Kengo Yamamoto 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
Study Design: Radiological analysis of normal patterns of sagittal alignment of the spine. Purpose: This study aimed to clarify the characteristics of normal sagittal spino-pelvic alignment in Asian people. Overview of Literature: It is known that there are differences in these parameters based on age, gender, and race. In order to properly plan for surgical correction of the spine for Asian patients, it is necessary to understand the normal spino-pelvic alignment parameters for this population. Methods: This study analyzed 86 Japanese healthy young adult volunteers (48 men and 38 women; age 35.9±11.1 (mean±standard deviation [SD]). The following parameters were measured on lateral standing radiographs of the entire spine: sagittal vertical axis (SVA), horizontal distance between the C7 plumb line and the posterior superior corner of the superior margin of S1, thoracic kyphotic angle (TK), lumbar lordotic angle (LLA), sacral slope (SS), pelvic tilt (PT), and pelvic incidence (PI). Results: The values (mean±SD) of SVA, TK, LLA, SS, PT, and PI were 8.45±25.7 mm, 27.5±9.6°, 43.4±14.6°, 34.6±7.8°, 13.2±8.2°, and 46.7±8.9°, respectively. The Japanese young adults evaluated in this study tended to have a smaller PI, LLA, TK, and SVA than most Caucasian people. Regarding gender differences, SVA was significantly longer and TK was significantly smaller in men; however, there was no statistically significant difference in LLA, SS, PA, and PI. Conclusions: Japanese young adults apparently have smaller PI and LLA values than Caucasian people. When making decisions for optimal sagittal spinal alignment, racial differences should be considered.
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Gait Analysis in Cervical Spondylotic Myelopathy
Hirosuke Nishimura,Kenji Endo,Hidekazu Suzuki,Hidetoshi Tanaka,Takaaki Shishido,Kengo Yamamoto 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.3
Study Design: Gait analysis of patients with cervical spondylotic myelopathy (CSM) by using a sheet-type gait analysis system. Purpose: The aim of this study was to compare the gait patterns of patients with CSM, evaluated by the Nurick grades, and to determine the threshold values of gait parameters predicting the occurrence of a fall by using a gait recorder. Overview of Literature: Gait disorder due to CSM may progress to severe paraplegia, following even a minor trauma such as a fall. The indications for the surgery of CSM without severe paralysis remain controversial. The quantitative gait analysis and the decision for decompressive surgery in patients with CSM are important in order to prevent severe paraplegia from a fall. Methods: One hundred thirty-two subjects (normal, 34; CSM, 98) underwent gait analysis by using a sensor sheet. Measurements of gait cycle parameters included the step and stride length, step width, foot angle, swing phase, and stance phase. CSM was assessed by Nurick grade. Results: Although the clinical symptoms were lacking, Nurick grade 1 had significant abnormalities in the parameters of velocity, step length, and step angle (p <0.05). Regarding the Nurick grade and walking phase, the length of the stance phase was increased to more than 70% of the entire walking cycle in Nurick grade 4. Conclusions: Gait analysis was an objective tool for evaluating the gait stability. Our results suggested that when the percentage of the stance phase in the gait cycle increases to above 70%, the CSM patients have an increased fall risk.
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