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Yusa, Hiroyuki,Kiuchi, Mai,Ohba, Eiji The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.3
In this paper, we propose a communication method with IP-based wide area networks for SCADA systems. This method controls communications between substations and a control center and can be implemented as a communication middleware. The method supports functions for UDP-based transmission, route control of double route transmission, retransmission control and priority control. The functions work cooperatively to assure reliable and real-time communications. We also examined the effectiveness of the method under circumstances where there are not only transmission delay and route breakdown in network but also information congestion in computer. The results show that the proposed method is more effective for assuring real-time and resilient feature than TCP-based communication method.
A Proposal of IP-based Computer Network Architecture for Facility Maintenance Information
Yusa, Hiroyuki,Otani, Tetsuo,Kurono, Masahiro The Korean Institute of Electrical Engineers 2012 The Journal of International Council on Electrical Vol.2 No.3
In this paper, we propose IP-based computer network architecture for communications of facility maintenance information. This architecture enables realization of overlay network on the IP network to control the communications. We also examined a feasibility of the architecture with an experiment system. The result shows that the feasibility of the architecture is confirmed.
Development of a Robot Boat for Aquatic Weed Management in Shallow Ponds
( Takeshi Yusa ),( Yutaka Kaizu ),( Kenji Imou ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
There are 50 Ramsar sites in Japan; although efforts to conserve the wetlands and lakes are underway, deterioration of the ecosystem is a problem. Specifically, growth of the lotus plant tends to interfere with river improvement works. Lake Izunuma-Uchinuma, Miyagi prefecture, Japan, is a shallow lake with considerable levels of eutrophication, wherein lotus plants grow to cover 85% of the lake’s surface annually. These lotus plants are cut as they adversely affect the surrounding ecosystems and landscapes. However, the existing cutting methods require manual labor. Therefore, to decrease the cost of vegetation management work, we developed a robotic boat to cut the lotus plants. We used an open source system to reduce the cost of the robot system. The robot boat was developed by modifying a 2.4-m-long and 1.2-m-wide plastic boat. The boat was equipped with an electric clipper and an electric paddle propulsion system that can navigate on the surface of water with vegetation. We used Pixhawk/ArduPilot, an open source flight controller used in drones, as a navigation controller based on GNSS and IMU. We conducted lotus-cutting experiments in the months of June and August by autonomous navigation in Lake Izunuma-Uchinuma. The experimental areas were 30 × 100 m with 25 target paths at 1.2 m intervals. The experiment in June was completed within 70 min for all areas, and the experiment in August was completed within 69 min for 1/3<sup>rd</sup> of the experimental area. Although the navigation accuracy was not very high, a safe and labor-saving vegetation management method using a robot boat was achieved.
Measurement ofCPasymmetries inB0→K0π0decays
Fujikawa, M.,Yusa, Y.,Dalseno, J.,Hazumi, M.,Sumisawa, K.,Aihara, H.,Arinstein, K.,Aulchenko, V.,Aushev, T.,Aziz, T.,Bakich, A. M.,Balagura, V.,Barberio, E.,Belous, K.,Bhardwaj, V.,Bischofberger, M.,B American Physical Society 2010 PHYSICAL REVIEW D - Vol.81 No.1
Observation of the decayB0→η′K*(892)0
Sato, S.,Yusa, Y.,Mohanty, G. B.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aushev, T.,Ayad, R.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Bhardwaj, V.,Bhuyan, B.,Bonvicini, G.,Bozek, American Physical Society 2014 PHYSICAL REVIEW D - Vol.90 No.7
Measurement of time-dependent CP violation in B 0 → η′K 0 decays
Š,antelj, L.,Yusa, Y.,Abdesselam, A.,Adachi, I.,Aihara, H.,Al Said, S.,Asner, D. M.,Aulchenko, V.,Aushev, T.,Ayad, R.,Bahinipati, S.,Bakich, A. M.,Bansal, V.,Bhardwaj, V.,Bhuyan, B.,Bondar, A.,Bo Institute of Physics Pub 2014 The journal of high energy physics Vol.2014 No.10
Shibayama Naoyuki,Kanda Hiroyuki,Yusa Shin-ichi,Fukumoto Shota,Baranwal Ajay K.,Segawa Hiroshi,Miyasaka Tsutomu,Ito Seigo 나노기술연구협의회 2017 Nano Convergence Vol.4 No.18
We confirmed the influence of ZnO nanoparticle size and residual water on performance of all inorganic perovskite solar cells. By decreasing the size of the ZnO nanoparticles, the short-circuit current density (Jsc) and open circuit photovoltage (Voc) values are increased and the conversion efficiency is improved. Although the Voc value is not affected by the influence of residual water in the solution for preparing the ZnO layer, the Jsc value drops greatly. As a result, it was found that it is important to use the oxide nanoparticles with a small particle diameter and to reduce the water content in the oxide forming material in order to manufacture a highly efficient all inorganic perovskite solar cells.
( Keishiro Kuma ),( Takeshi Yusa ),( Yutaka Kaizu ),( Kenji Imou ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Degradation of wetlands due to the overgrowth of aquatic plants is a problem in various areas; hence, vegetation management using robot boats is under development. Herein, we proposed a method to recognize aquatic plants via real-time image processing to enable the automation of a robot boat. We adopted a segmentation method using deep learning for image processing and conducted deep learning and testing on our own dataset. An NVIDIA Jetson TX 2 embedded AI computing device achieved an execution time of 1.31 fps (image size: 576 × 324 px). The traveling speed of the robot boat was considerably slow at 0.3 m s<sup>-1</sup>; hence, the boat can be implemented as a real-time system even at a processing speed of 1.31 fps.