ACTIVE NOISE CONTROL USING A STEERABLE PARAMETRIC SPEAKER

Motoki Tanaka,Nobuo Tanaka 한국소음진동공학회 2008 한국소음진동공학회 국제학술대회논문집 Vol.2008 No.7

Vision Based Pointing Device with Slight Body Movement

Motohiro Tanaka,Motoki Hara,Yoshitaka Morito,Taichi Sakamoto,Kazuya Miyamori,Shunji Moromugi,Takakazu Ishimatsu 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

It is widely acknowledged that computer is powerful tool to improve the quality of life of the people with disability. One problem is how the user manipulates the computer using suitable input device designed for him or her. This paper proposes tow pointing devices based on vision for the people with disability as input devices. These devices detect the position of the marks attached on the users head. According to the head movements, computer cursor on the computer display is moved in two-dimensionally. A distinct advantage of these devices is that various strategies could be installed based on the situation of the users. The pointing device was applied to a drawing tool of the painting software for an patients successfully.

Phase Resonance in Centrifugal Fluid Machinery -A Comparison between Pump Mode and Turbine Mode Operations and a Discussion of Mechanisms of Flow Rate Fluctuation through a Stator-

Yonezawa, Koichi,Toyahara, Shingo,Motoki, Shingo,Tanaka, Hiroshi,Doerfler, Peter,Tsujimoto, Yoshinobu Korean Society for Fluid machinery 2014 International journal of fluid machinery and syste Vol.7 No.2

Phase resonance in Francis type hydraulic turbine is studied. The phase resonance is a phenomenon that the pressure fluctuation in the penstock of hydraulic turbine installation can become very large when the pressure waves from each guide vane caused by the interaction with the runner vane reach the penstock with the same phase. Experimental and numerical studies have been carried out using a centrifugal fan. In the present study, comparisons between the pump mode and the turbine mode operations are made. The experimental and numerical results show that the rotational direction of the rotor does not affect characteristics of the pressure fluctuation but the propagation direction of the rotorstator interaction mode plays an important role. Flow rate fluctuations through the stator are examined numerically. It has been found that the blade passing flow rate fluctuation component can be evaluated by the difference of the fluctuating pressure at the inlet and the outlet of the stator. The amplitude of the blade passage component of the pressure fluctuation is greater at the stator inlet than the one at the stator outlet. The rotor-stator interaction mode component is almost identical at the inlet and the outlet of the stator. It was demonstrated that the pressure fluctuation in the volute and connecting pipe normalized by the flow rate fluctuation becomes the same for pump and turbine mode operations, and depends on the rotational direction on the interaction mode.

Potential impact of climate change on canopy tree species composition of cool‐temperate forests in Japan using a multivariate classification tree model

Matsui, Tetsuya,Nakao, Katsuhiro,Higa, Motoki,Tsuyama, Ikutaro,Kominami, Yuji,Yagihashi, Tsutomu,Koide, Dai,Tanaka, Nobuyuki Springer Japan 2018 Ecological research Vol.33 No.2

<P><B>Abstract</B></P><P>Climate change will likely change the species composition or abundance of plant communities, and it is important to anticipate these changes to develop climate change adaptation policies. We chose beech (<I>Fagus crenata</I> Blume) and its competitive tree species as target species to evaluate potential turnover in forest types under climate change using a multivariate classification tree model. To construct the model, geographical presence/absence data for nine target species were used as multivariate response variables, with five climatic factors were used as predictor variables. Current and future distribution probabilities for the target species were calculated, and the 15 dominant forest types were subjectively classified in approximately 1‐km<SUP>2</SUP> grid cells within the area of the current beech forest distribution. All 16,398 grid cells of the beech‐dominant forest type (FCR‐QCR) were projected to be replaced in the future by five <I>Quercus crispula</I>‐dominant types (59% of FCR‐QCR grid cells), four <I>Q. serrata</I> types (22%), two <I>Q. salicina</I> types (8%), or two <I>Abies firma</I> types (0.1%). The FCR‐QCR type remained unchanged (stable) in only 11.4% of grid cells; these were mainly distributed at high elevations in snowy areas on the Sea of Japan side of the country. In contrast, vulnerable habitats (future probability of beech occurrence less than 1.0%) were found at low elevations on both the Sea of Japan and the Pacific Ocean sides. Northwards or upwards range expansions or increases of <I>Quercus</I> spp., in particular, need to be carefully monitored.</P>

Phase Resonance in Centrifugal Fluid Machinery -A Comparison between Pump Mode and Turbine Mode Operations and a Discussion of Mechanisms of Flow Rate Fluctuation through a Stator-

Koichi Yonezawa,Shingo Toyahara,Shingo Motoki,Hiroshi Tanaka,Peter Doerfler,Yoshinobu Tsujimoto 한국유체기계학회 2014 International journal of fluid machinery and syste Vol.7 No.2

Phase resonance in Francis type hydraulic turbine is studied. The phase resonance is a phenomenon that the pressure fluctuation in the penstock of hydraulic turbine installation can become very large when the pressure waves from each guide vane caused by the interaction with the runner vane reach the penstock with the same phase. Experimental and numerical studies have been carried out using a centrifugal fan. In the present study, comparisons between the pump mode and the turbine mode operations are made. The experimental and numerical results show that the rotational direction of the rotor does not affect characteristics of the pressure fluctuation but the propagation direction of the rotor-stator interaction mode plays an important role. Flow rate fluctuations through the stator are examined numerically. It has been found that the blade passing flow rate fluctuation component can be evaluated by the difference of the fluctuating pressure at the inlet and the outlet of the stator. The amplitude of the blade passage component of the pressure fluctuation is greater at the stator inlet than the one at the stator outlet. The rotor-stator interaction mode component is almost identical at the inlet and the outlet of the stator. It was demonstrated that the pressure fluctuation in the volute and connecting pipe normalized by the flow rate fluctuation becomes the same for pump and turbine mode operations, and depends on the rotational direction on the interaction mode.

Field Scene Recognition for Navigating Autonomous Agricultural Vehicle

( Yoshinari Morio ),( Yuta Sawada ),( Masataka Shioji ),( Motoki Tanaka ),( Katsusuke Murakami ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

In this study, four agricultural vehicle navigation systems, namely, two different types of vehicle position estimation systems for self-localization of an autonomous agricultural vehicle, an obstacle detection system for safety self-driving, and an agricultural key-objects recognition system for intelligent worker assistance, were developed by using image processing system without using GNSS and LiDAR. Firstly, in the two types of vehicle position estimation systems, the position of a vehicle could be estimated by matching an input field scene image to the training scene images captured along each of targeted traveling routes. The scene images were captured by using a three-camera-type of capture system with left camera, front camera, and right camera. Secondly, in the obstacle detection system, obstacles on a road, ditches along a road, and the level difference between a traveling road and a farm field were detected by using the stereo camera built with two web camera. The obstacles, ditches, and the level difference were recognized by in real time estimating 3D ground plane. Finally, in the agricultural key-objects recognition system, key-object types(workers, trucks, containers, agricultural machines) and key-posture types(standing, squat, stoop, sitting), key-worker-direction types (front, back, left, right), and container contents amount could be recognized by using deep learning based system of YOLO. The experimental results demonstrated the potential of our systems for navigating an autonomous vehicle in agricultural fields.

Phase 2 single-arm study on the safety of maintenance niraparib in Japanese patients with platinum-sensitive relapsed ovarian cancer

Kazuhiro Takehara,Takashi Matsumoto,Junzo Hamanishi,Kosei Hasegawa,Motoki Matsuura,Kiyonori Miura,Shoji Nagao,Hidekatsu Nakai,Naotake Tanaka,Hideki Tokunaga,Kimio Ushijima,Hidemichi Watari,Yoshihito Y 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.2

Objective: The primary objective of this study was to evaluate the safety of niraparib 300 mg/dayin Japanese patients with platinum-sensitive, relapsed ovarian cancer in a maintenance setting. Methods: Phase 2, multicenter, open-label, single-arm study enrolled Japanese patients withplatinum-sensitive, relapsed ovarian cancer who had received ≥2 platinum-based regimens. The primary endpoint (incidence of grade 3 or 4 thrombocytopenia-related events within 30days after initial niraparib administration) was justified by the incidences of a global pivotalphase 3 study and its post-hoc safety analysis on thrombocytopenia, the major hematologicaladverse event of niraparib. The overall safety analysis examined other treatment-emergentadverse events (TEAEs). Results: Enrolled patients (n=19) had a median (min, max) body weight of 53.9 (40.8–79.1)kg; all but one patient weighed <77 kg. Most (94.7%) patients initially received niraparib300 mg/day but this decreased in subsequent cycles (mean±standard deviation doseintensity, 191.6±65.7 mg/day). In total, 6/19 (31.6%) patients experienced grade 3 or 4 thrombocytopenia-related events within 30 days of initial niraparib administration. Other common TEAEs included nausea, and decreased platelet or neutrophil counts. Noprogression-free or overall survival events occurred; only 1 of 4 response-evaluable patientshad a post-baseline tumor assessment (stable disease). Conclusion: The incidence of grade 3 or 4 thrombocytopenia-related events in Japaneseovarian cancer patients was similar to that in the corresponding non-Japanese study. Overall,the safety profile was acceptable and consistent with the known safety profile and previousexperience with niraparib. Trial Registration: ClinicalTrials.gov Identifier: NCT03759587