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Boson peak dynamics of glassy glucose studied by integrated terahertz-band spectroscopy
Kabeya, Mikitoshi,Mori, Tatsuya,Fujii, Yasuhiro,Koreeda, Akitoshi,Lee, Byoung Wan,Ko, Jae-Hyeon,Kojima, Seiji American Physical Society 2016 Physical Review B Vol.94 No.22
<P>We performed terahertz time-domain spectroscopy, low-frequency Raman scattering, and Brillouin light scattering on vitreous glucose to investigate the boson peak (BP) dynamics. In the spectra of alpha(nu)/nu(2) [alpha(nu) is the absorption coefficient], the BP is clearly observed around 1.1 THz. Correspondingly, the complex dielectric constant spectra show a universal resonancelike behavior only below the BP frequency. As an analytical scheme, we propose the relative light-vibration coupling coefficient (RCC), which is obtainable from the combination of the far-infrared and Raman spectra. The RCC reveals that the infrared light-vibration coupling coefficient C-IR(nu) of the vitreous glucose behaves linearly on frequency which deviates from Taraskin's model of C-IR(nu) = A + B nu(2) [S. N. Taraskin et al., Phys. Rev. Lett. 97, 055504 (2006)]. The linearity of C-IR(nu) might require modification of the second term of the model. The measured transverse sound velocity shows an apparent discontinuity with the flattened mode observed in the inelastic neutron scattering study [N. Violini et al., Phys. Rev. B 85, 134204 (2012)] and suggests a coupling between the transverse acoustic and flattened modes.</P>
Tsuneaki Takao,Seiji Okada,Yuichiro Morishita,Takeshi Maeda,Kensuke Kubota,Ryosuke Ideta,Eiji Mori,Itaru Yugue,Osamu Kawano,Hiroaki Sakai,Takayoshi Ueta,Keiichiro Shiba 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.3
Study Design: Retrospective case series. Purpose: To clarify the influence of cervical spinal canal stenosis (CSCS) on neurological functional recovery after traumatic cervical spinal cord injury (CSCI) without major fracture or dislocation Overview of Literature: The biomechanical etiology of traumatic CSCI remains under discussion and its relationship with CSCS is one of the most controversial issues in the clinical management of traumatic CSCI. Methods: To obtain a relatively uniform background, patients non-surgically treated for an acute C3–4 level CSCI without major fracture or dislocation were selected. We analyzed 58 subjects with traumatic CSCI using T2-weighted mid-sagittal magnetic resonance imaging. The sagittal diameter of the cerebrospinal fluid (CSF) column, degree of canal stenosis, and neurologic outcomes in motor function, including improvement rate, were assessed. Results: There were no significant relationships between sagittal diameter of the CSF column at the C3–4 segment and their American Spinal Injury Association motor scores at both admission and discharge. Moreover, no significant relationships were observed between the sagittal diameter of the CSF column at the C3-4 segment and their neurological recovery during the following period. Conclusions: No relationships between pre-existing CSCS and neurological outcomes were evident after traumatic CSCI. These results suggest that decompression surgery might not be recommended for traumatic CSCI without major fracture or dislocation despite pre-existing CSCS.
Ayako Uchinaka,Yoshinosuke Hamada,Seiji Mori,Shigeru Miyagawa,Atsuhiro Saito,Yoshiki Sawa,Nariaki Matsuura,Naomasa Kawaguchi 한국조직공학과 재생의학회 2015 조직공학과 재생의학 Vol.12 No.3
In ischemic heart disease, cardiomyocyte death results from both necrosis and apoptosis, and the area of infarction gradually increases. The induction of therapeutic angiogenesis is a promising therapy for this condition. In the present study, we investigated the actions of SV peptide—a 7-amino-acid sequence with angiogenic properties derived from osteopontin in the extracellular matrix—in a rat model of myocardial ischemia. We examined the angiogenesis activity of SV ex vivo using ring assay and dorsal air sac assay and in ischemic myocardium. We also conducted histological evaluations of left-ventricle remodeling and evaluated left ventricular (LV) function by echocardiography. The SV peptide had strong angiogenic effects both ex vivo and in vivo. In the experimental rats, this peptide stimulated the formation of new blood vessels in ischemic myocardium. Histological evaluation of the left ventricle in the SV-treated group showed a significant decrease in the size of the infarction, rate of myocardial fibrosis, and cardiomyocyte hypertrophy. Moreover, administration of the SV peptide significantly improved LV function. These results indicate that SV peptide induced angiogenesis in ischemic myocardium and improved cardiac function. Thus, it could serve as a potentially useful new therapy for ischemic heart disease.
Extraction of Individual Pedestrians Employing Stereo Camera Images
Mitsuhisa Kawabe,Joo Kooi Tan,Hyoungseop Kim,Seiji Ishikawa,Takashi Morie 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
A traffic accident occurs mainly because of carelessness of a driver. To prevent such an accident, many systems which detect pedestrians from vehicle are proposed. But most of these systems give a warning to a driver every time when a pedestrian is detected. The effect of warning becomes lower if the frequency of warning increases in a busy area. The objective of this study is to develop a technique for detecting pedestrians from a vehicle and to arrange them according to their potential risks by analyzing their behaviors. In this paper, we propose a technique for segmenting pedestrians employing stereo camera images to analyze a pedestrian’s behavior. First, foreground regions are extracted employing background estimation using the mixture of Gaussian model. After extracting foreground regions in an input image, these regions are segmented by using the distance information. By using this method, each shape of the detected pedestrians can be obtained even when pedestrians are overlapping with each other. The proposed technique was examined experimentally employing real video images and satisfactory results were obtained.
Applying HOG Feature to the Detection and Tracking of a Human on a Bicycle
Heewook Jung,Joo Kooi Tan,Seiji Ishikawa,Takashi Morie 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Detection of a human on a bicycle is an important research subject in an advanced safety vehicle driving system to decrease traffic accidents. The Histograms of Oriented Gradients (HOG) feature has been proposed as useful feature for detecting a standing human in various kinds of background. So, many researchers use currently the HOG feature to detect a human. Detecting a human on a bicycle is more difficult than detecting a human because a bicycle’s appearance can change dramatically according to viewpoints. In this paper, we propose a method of detecting a human on a bicycle using HOG feature and RealAdaboost algorithm. When detecting a human on a bicycle, occlusion is a cause of decreasing detection efficiency. Occlusion is a serious matter in car vision research because there are occlusions in real transportation environment. We decide the next position of a human on a bicycle using object tracking. Experimental results and evaluation show satisfactory performance of the proposed method.
Small Angle Neutron Scattering Study on the Structural Variation of Lysozyme in Bioprotectants
Shota Koda,Haruki Takayama,Tomohiko Shibata,Tatsuya Mori,Seiji Kojima,In-Sung Park,Tae-Gyu Shin 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
The thermal denaturation and subsequent structural variation of lysozyme in various bioprotectant candidate solutions such as trehalose and choline acetate have been investigated by using small angle neutron scattering and differential scanning calorimetry. The gyration radius shows little change with the addition of additives in a native state at room temperature. On heating the lysozyme solution, a remarkable increase in the gyration radius is observed at temperatures above the denaturation temperature without any bioprotectants. Such an increase is suppressed by the additives owing to the intermolecular interactions between the lysozyme molecules and the bioprotectants of trehalose and choline acetate. The fractal dimension of lysozyme varies slightly with the addition of the bioprotectant solutions, and shows a remarkable drop in the vicinity of the denaturation temperature for all the solutions.
Detecting a Human Body Direction Using a Feature Selection Method
Yuuki Nakashima,Joo Kooi Tan,Seiji Ishikawa,Takashi Morie 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper describes a novel technique for detecting a human body direction using SVM constructed by HOG feature selected by AdaBoost. HOG feature is well-known feature for the robust judgment of a human. We employ the feature for detecting a human body direction. We compared some feature selecting methods with the previous one. Experimental results show effectiveness of the proposed method.
Moving Objects Detection at an Intersection by Sequential Background Extraction
Shin-ichiro Sonoda,Joo Kooi Tan,Hyoungseop Kim,Seiji Ishikawa,Takashi Morie 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Recently, there are many traffic accidents in turning right at an intersection. They are mainly caused by a driver’s oversight of pedestrians and motorcycles that are occluded by oncoming cars. Therefore a system is necessary to detect moving objects such as oncoming cars and pedestrians at an intersection, and warn a vehicle driver. This paper describes a technique for detecting moving objects in turning right at an intersection when vehicle is stopping. Moving objects are detected by Mixture of Gaussians (MoG). In addition, we distinguish cars from pedestrians using the difference of the area size and the aspect ratio of detected objects. The object which is classified as a pedestrian is tracked using Lucas-Kanade Tracker. If the detected cars and pedestrians overlap or a car completely obscures pedestrians, we perform the estimation of pedestrian’s location by using the information on past frames. By doing this, it is possible to detect pedestrians that drivers are actually difficult to see. The performance of the proposed technique was examined employing car videos and satisfactory results were obtained.
Hikari Shimadera,Hiroshi Hayami,Satoru Chatani,Tazuko Morikawa,Yu Morino,Yasuaki Mori,Kazuyo Yamaji,Seiji Nakatsuka,Toshimasa Ohara 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.2
The urban model inter-comparison study (UMICS) was conducted in order to improve the performance of air quality models (AQMs) for simulating fine particulate matter (PM2.5) in the Greater Tokyo Area of Japan. UMICS consists of three phases: the first phase focusing on elemental carbon (UMICS1), the second phase focusing on sulfate, nitrate and ammonium (UMICS2), and the third phase focusing on organic aerosol (OA) (UMICS 3). In UMICS2/3, all the participating AQMs were the Community Multiscale Air Quality modeling system (CMAQ) with different configurations, and they similarly overestimated PM2.5 nitrate concentration and underestimated PM2.5 OA concentration. Various sensitivity analyses on CMAQ configurations, emissions and boundary concentrations, and meteorological fields were conducted in order to seek pathways for improvement of PM2.5 simulation. The sensitivity analyses revealed that PM2.5 nitrate concentration was highly sensitive to emissions of ammonia (NH3) and dry deposition of nitric acid (HNO3) and NH3, and PM2.5 OA concentration was highly sensitive to emissions of condensable organic compounds (COC). It was found that PM2.5 simulation was substantially improved by using modified monthly profile of NH3 emissions, larger dry deposition velocities of HNO3 and NH3, and additionally estimated COC emissions. Moreover, variability in PM2.5 simulation was estimated from the results of all the sensitivity analyses. The variabilities on CMAQ configurations, chemical inputs (emissions and boundary concentrations), and meteorological fields were 6.1-6.5, 9.7-10.9, and 10.3-12.3%, respectively.