http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Study on SLAM for Indoor Blimp with Visual Markers
Tatsuya Yamada,Takehisa Yairi,Suay Halit Bener,Kazuo Machida 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The simultaneous localization and mapping (SLAM) is an essential capability for mobile robots traveling in unknown environments where globally accurate position data is not available. In this paper, we address the SLAM problem of indoor toy blimp that has no sensors such as accelerometers and gyro except a micro camera because of the weight limits. Since it is difficult to determine the exact motion models preliminarily, we assume the motion models of the blimp. The goal of this paper is to construct a 3D map of the landmarks in environment and estimate the path taken by the indoor blimp. In this paper, we use visual markers as the landmarks, since it is difficult to detect features of the landmarks. We propose the approach to SLAM using Extended Kalman Filter (EKF) and verify the effectiveness of this approach by the experiments.
Association between Pelvic Parameters and Vaginal Delivery
Yamada Tomohiro,Yamato Yu,Hasegawa Tomohiko,Yoshida Go,Yasuda Tatsuya,Banno Tomohiro,Arima Hideyuki,Oe Shin,Mihara Yuki,Ushirozako Hiroki,Ide Koichiro,Watanabe Yuh,Hosino Hironobu,Matsuyama Yukihiro 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.2
Study Design: Cross-sectional study. Purpose: To investigate the association between vaginal delivery and pelvic parameters and clarify the effect of parity on parameter fluctuations. Overview of Literature: During vaginal delivery, the sacroiliac joint widens and the sacrum nutates (nods). However, the association between these pelvic parameters and parity is unknown. Methods: As part of a 2016 health screening, 320 female volunteers underwent whole-spine radiographs. Age-matched healthy women were grouped according to the number of vaginal deliveries (0, 1–2, or ≥3). Demographic variables and spinopelvic parameters were compared among the three groups. Results: Of the 320 volunteers, 213 were enrolled (mean age, 71.1±7.2 years). The mean number of vaginal deliveries was 2.2. The average pelvic incidence (PI) was 55.6°±11.1° and was significantly higher in the 90 women with three or more vaginal deliveries than in the other two groups (p<0.001). The average sacral slope was 33.4°±11.1° and was significantly higher in the women with three or more vaginal deliveries than in the 18 who did not deliver vaginally (p<0.001). The 105 women with one or two vaginal deliveries had significantly higher PIs and sacral slopes than did those who did not deliver vaginally (p<0.001). Conclusions: This is the first study documenting an association between vaginal delivery and pelvic parameters. Bony birth canal realignment during vaginal delivery can affect postnatal PI. Our study helps in understanding the PI changes over a woman’s life span.
Regenerative capacity of augmented bone in rat calvarial guided bone augmentation model
Tatsuya Kubota,Akira Hasuike,Yasumasa Ozawa,Takanobu Yamamoto,Katsuyoshi Tsunori,Yutaka Yamada,Shuichi Sato 대한치주과학회 2017 Journal of Periodontal & Implant Science Vol.47 No.2
Purpose: Guided bone regeneration (GBR) is the most widely used technique to regenerate and augment bones. Even though augmented bones (ABs) have been examined histologically in many studies, few studies have been conducted to examine the biological potential of these bones and the healing dynamics following their use. Moreover, whether the bone obtained from the GBR procedure possesses the same functions as the existing autogenous bone is uncertain. In particular, little attention has been paid to the regenerative ability of GBR bone. Therefore, the present study histologically evaluated the regenerative capacity of AB in the occlusive space of a rat guided bone augmentation (GBA) model. Methods: The calvaria of 30 rats were exposed, and plastic caps were placed on the right of the calvaria in 10 of the 30 rats. After a 12-week healing phase, critical-sized calvarial bone defects (diameter: 5.0 mm) were trephined into the dorsal parietal bone on the left of the calvaria. Bone particles were harvested from the AB or the cortical bone (CB) using a bone scraper and transplanted into the critical defects. Results: The newly generated bone at the defects' edge was evaluated using micro-computed tomography (micro-CT) and histological sections. In the micro-CT analysis, the radiopacity in both the augmented and the CB groups remained high throughout the observational period. In the histological analysis, the closure rate of the CB was significantly higher than in the AB group. The numbers of cells positive for runt-related transcription factor 2 (Runx2) and tartrate-resistant acid phosphatase (TRAP) in the AB group were larger than in the CB group. Conclusions: The regenerative capacity of AB in the occlusive space of the rat GBA model was confirmed. Within the limitations of this study, the regenerative ability of the AB particulate transplant was inferior to that of the CB particulate transplant.
Tessei Yamada,Tatsuya Arakawa 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
Question answering generally generates the answer to the question by extracting the named entity from the sentences containing the answer to the question from information sources. However, it is not always true that a named entity is an answer to the question. So we propose a method for generating the answer sentence using statistical machine translation. The probability models are constructed by learning from enormous samples of the set of question sentence, extracted sentence, and answer sentence. The question sentence and the sentence extracted by the question answering from information source are regarded as an input of machine translation. They are translated to a suitable answer sentence to the question. In this paper, we attempted to apply our method to several simple types questions that can also be answered by the named entity extraction.
Regenerative capacity of augmented bone in rat calvarial guided bone augmentation model
Kubota, Tatsuya,Hasuike, Akira,Ozawa, Yasumasa,Yamamoto, Takanobu,Tsunori, Katsuyoshi,Yamada, Yutaka,Sato, Shuichi Korean Academy of Periodontology 2017 Journal of Periodontal & Implant Science Vol.47 No.2
Purpose: Guided bone regeneration (GBR) is the most widely used technique to regenerate and augment bones. Even though augmented bones (ABs) have been examined histologically in many studies, few studies have been conducted to examine the biological potential of these bones and the healing dynamics following their use. Moreover, whether the bone obtained from the GBR procedure possesses the same functions as the existing autogenous bone is uncertain. In particular, little attention has been paid to the regenerative ability of GBR bone. Therefore, the present study histologically evaluated the regenerative capacity of AB in the occlusive space of a rat guided bone augmentation (GBA) model. Methods: The calvaria of 30 rats were exposed, and plastic caps were placed on the right of the calvaria in 10 of the 30 rats. After a 12-week healing phase, critical-sized calvarial bone defects (diameter: 5.0 mm) were trephined into the dorsal parietal bone on the left of the calvaria. Bone particles were harvested from the AB or the cortical bone (CB) using a bone scraper and transplanted into the critical defects. Results: The newly generated bone at the defects' edge was evaluated using micro-computed tomography (micro-CT) and histological sections. In the micro-CT analysis, the radiopacity in both the augmented and the CB groups remained high throughout the observational period. In the histological analysis, the closure rate of the CB was significantly higher than in the AB group. The numbers of cells positive for runt-related transcription factor 2 (Runx2) and tartrate-resistant acid phosphatase (TRAP) in the AB group were larger than in the CB group. Conclusions: The regenerative capacity of AB in the occlusive space of the rat GBA model was confirmed. Within the limitations of this study, the regenerative ability of the AB particulate transplant was inferior to that of the CB particulate transplant.
Minoru Yamada,Tatsuya Tegoshi,Niichiro Abe,Misako Urabe 대한기생충학열대의학회 2012 The Korean Journal of Parasitology Vol.50 No.3
The present study was performed to describe 2 human cases infected by the horsehair worm, Parachordodes sp., in Japan. Two gordiid worms were collected in the vomit and excreta of an 80-year-old woman in November 2009 in Kyoto city, and in the mouth of 1-year-old boy in December 2009 in Nara city, Japan, respectively. Both worms were males having bifurcated posterior ends and male gonads in cross sectional specimens. They were identified as Parachordodes sp. (Nematomorpha: Chordodidae) based on the characteristic morphologies of cross sections and areoles in the cuticle. DNA analysis on 18S rRNA partial sequence arrangements was also carried out and both worms were assumed to be close to the genus Paragordionus based on tree analysis, and far from Gordius sp. which has already been reported in humans in Japan. DNA sequencing of the Parachordodes worm does not appear on the database; therefore, more information on the gene sequences of the genus Parachordodes from humans, animals, or intermediates is required.
Hiroshi Yoshizumi,Tatsuya Yamada,Kouki Matsuse,Kiyoaki Sasagawa 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
The purpose of this work is to find out performance of speed sensorless direct-field-orientecl controlled induction motor operating in very low speed region using adaptive flux observer. We discuss on the effect of the characteristic of A/D converter to estimated motor speed in this control system by simulation.
( Shunsuke Gotoh ),( Tatsuya Kuboyama ),( Yasuo Moriyoshi ),( Koichi Hatamura ),( Junichi Takanashi ),( Toshio Yamada ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
The objective of this research is to extend the HCCI operational range by using direct fuel injection system and also our original blowdown supercharge (BDSC) system. The effect of in-cylinder fuel distribution on HCCI operational range was numerically and experimentally investigated. Firstly, a numerical simulation using a multi zone reaction model was carried out. The results showed that a uniform fuel distribution decreases the pressure rise rate (dP/dθ) with the thermal distribution generated by the BDSC system. Next, experiments were carried out using a gasoline engine equipped with the direct fuel injection and BDSC systems. The fuel injection timing, the fuel mass ratio between the direct injection and the port injection was varied as an experimental parameter to investigate the effect of the fuel distribution on the high load HCCI operational limits. The experimental results showed that the HCCI operational robustness at the high load operation was successfully improved by using the direct fuel injection. However, high load HCCI operational limit was hardly extended. Next, by using the endothermic effect of fuel, enhancement of thermal stratification was tested. However, the relationship between CA50 and dP/dθmax was not improved.