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Numerical Analysis of Flow in Radial Turbine
Kenta OTSUKA,Tomoya KOMATSU,Hoshio TSUJITA,Satoshi YAMAGUCHI,Akihiro YAMAGATA 한국유체기계학회 2016 International journal of fluid machinery and syste Vol.9 No.2
Variable Geometry System (VGS) is widely applied to the nozzle vane for the radial inflow turbine constituting automotive turbochargers for the purpose of optimizing the power output at each operating condition. In order to improve the performance of radial turbines with VGS, it is necessary to clarify the influences of the setting angle of nozzle vane on the internal flow of radial turbine. However, the experimental measurements are considered to be difficult for the flow in radial turbines because of the small size and the high rotational speed. In the present study, the numerical calculations were carried out for the flow in the radial turbine at three operating conditions by applying the corresponding nozzle vane exit angles, which were set up in the experimental study, as the inlet boundary condition. The numerical results revealed the characteristic flow behaviors at each operating condition.
Development of Direct Operation System for Mobile Robot by Using 3D CG Diorama
Kenta Kato,Noritaka Sato,Yoshifumi Morita 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
A gamepad and images from a camera mounted on the robot are generally used in the teleoperation interface for a mobile robot . However, the teleoperation is difficult for inexperienced users. To solve this problem, we propose an interface that mixes and presents both visual and haptic sense. This interface consists of a force feedback device and a camera installed on behind of a display (see-through display). The CG models that simulate a real environment and a real robot, and hands of the operator are shown on the see-through display. The position of the top end of force feedback device at behind of the see-through display is controlled to be the position corresponding to the drawing position of the CG of the robot. The operator feels as if he/she directly grasps the real robot by using proposed interface. In this study, proposed interface is applied to a remote control task of a mobile robot and the evaluation experiment is carried out which task is step-climbing by a teleoperated robot.
The Cultural Aspects of Disaster in Japan : Silent Tributes to the Dead and Memorial Rocks
Kenta Awazu 한국종교사회학회 2016 종교와사회 Vol.4 No.1
This paper investigates several researches on “collective memory,” and examines the contribution of these approaches toward the sociological and historical inquiry. The theory of collective memory could be said a new trend in the sociology of knowledge, which seeks to theorize the social construction and social position of knowledge related to the past, as well as the collective dynamics surrounding memory. Collective memory is also seen as an inter-subjective memory as an intermediate variable, this paper suggests that the theory of collective memory can be studied through an analysis of symbolic content itself and its dynamics with wider society. Facilities that commemorate the victims of disaster and the disasters themselves provide a material framework for collective memory. This “place of memory” is a place of mnemonic practice where various groups construct their memories. This paper has focused on ‘silent’ tributes to the victims of disasters in Japan and has mainly two aims. First, introduce recent Japanese situation in cope with disaster after Tōhoku earth Quake 2011. Second, to try to have theoretical re-examination on the sociological theories of collective memory especially focused on its epistemological aspects ‘extended mind’ or ‘mediated mind’ theories.
Kenta Takahashi,Mayu Yunokawa,Shinsuke Sasada,Yae Takehara,Naoyuki Miyasaka,Tomoyasu Kato,Kenji Tamura 대한부인종양학회 2019 Journal of Gynecologic Oncology Vol.30 No.1
Objective: To develop and validate a 3-year recurrence prediction score (RPS) system for predicting the baseline risk of recurrence of stage I–II endometrial carcinoma. Methods: We reviewed 427 patients with International Federation of Gynecology and Obstetrics staging I–II endometrial carcinoma underwent surgery without any adjuvant therapy from 2005 to 2013. The patients were divided into 2 groups: the test cohort (n=251) comprising those who underwent surgery in odd-numbered years, and the validation cohort (n=176) comprising those who underwent surgery in even-numbered years. Multivariate analysis was performed using 7 candidate predictors to identify the risk factors for 3-year recurrence-free interval (RFI) in the test cohort. Each risk factor was scored based on logistic regression analyses of the test data set, and the sum of the risk factor scores was defined as the RPS system. We then applied the system in the validation cohort. Results: Multivariate analysis revealed that the significant risk factors were age ≥60 years, pathological type II, positive cervical stromal invasion, and positive peritoneal cytology. In the test cohort, the 3-year RFI rates were 100%, 95.8%, 79.9%, and 33.3% for RPSs of 0, 1, 2, and 3, respectively. In the validation cohort, the 3-year RFI was significantly higher in the low-RPS group (RPS 0 or 1) than in the high-RPS group (RPS 2 or 3) (95.2% vs. 79.9%, p<0.01). Conclusions: The RPS system shows significant reproducibility for predicting the baseline risk of recurrence. The system could potentially impact the choice of adjuvant therapy for stage I–II endometrial carcinoma.
Swallowing Motion Analyzing from Dental MR Imaging Based on AKAZE and Particle Filter Algorithm
Kenta Suetani,Huimin Lu,Joo Kooi Tan,Hyoungseop Kim,Tatsurou Tanaka,Shinji Kitou,Yasuhiro Morimoto 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
In recent years, dysphagia is problem among elderly people. Therefore, it is necessary to accurately evaluate swallowing function in order to prevent swallowing disorder beforehand or to detect it early. And it is considered that evaluation of swallowing function using Magnetic Resonance Imaging (MRI) is useful. In order to accurately analyzing of the swallowing motion using a computer aided diagnosis (CAD) system on MR imaging, automatic extraction of the esophagus region, which is a region of interest by the image analysis method, is required. Extraction of the spinal region is required as a preliminary step of the esophagus region extraction. Therefore, in this paper, we develop an analysis method of swallowing movement by three steps of extraction of spinal region, extraction of esophageal region, and analysis of swallowing movement. As an analytical method of swallowing movement, we emphasize the liquid part at the time of swallowing movement using an emphasis map, then follow the liquid tracing by using the AKAZE feature quantity and the particle filter algorithm, and analyze the swallowing motion.