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Simple Routing Control System for 10 Gb/s Data Transmission Using a Frequency Modulation Technique
Daichi Omoto,Keiji Kishine,Hiromi Inaba,Tomoki Tanaka 대한전자공학회 2016 IEIE Transactions on Smart Processing & Computing Vol.5 No.3
This paper describes a simple routing control system. We propose achieving high-speed data transmission without modifying the data frame configuration. To add a routing control signal, called the “labeling signal” in this paper, to the data frame, we use a frequency modulation technique on the transmitted frame. This means you need not change the data frame when you transmit additional signals. Using a prototype system comprising a field-programmable gate array and discrete elements, we investigate the system performance and devise a method to achieve high resolution. A three-channel routing control for a 10 Gb/s data frame was achieved, which confirms the advantages of the proposed system.
Fork-tailed caterpillars bite off their long anal prolegs to pupate in fallen branches
Daichi Funamoto,Shinji Sugiura 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2
Some insects autotomise appendages such as legs to escape from predator attacks. Similar behaviour can be observed in other situations. Here, we report that Shachia circumscripta (Lepidoptera: Notodontidae) larvae bite off their long anal prolegs to facilitate pupation in fallen branches. Larvae of S. circumscripta have extremely long anal prolegs, comprising one half of their body length.When disturbed, S. circumscripta larvae use their anal prolegs in defensive posturing. Final instar larvae use theirmandibles to tunnel into fallen branches and form a pupal chamber inside. Just before closing the entrances of pupal chambers, larvae bite off their anal prolegs with their mandibles and eject the severed prolegs through the chamber entrance. The extremely long anal prolegs can hinder the larvae from turning in the tunnels before closing the chamber entrance; leg cutting in S. circumscripta larvae may therefore be an adaptive behaviour that allows the insect to pupate within the limited space of fallen branches.
Experimental Confirmation of Propulsion and Levitation Control for Linear Induction Motor
Daichi Okamori,Shouta Nakatani,Kenta Sannomiya,Toshimitsu Morizane,Noriyuki Kimura,Hideki Omori 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Linear motors and Electro Magnetic Suspension (EMS) are used in the maglev system. Linear Induction motors (LIMs) have simple structure, flexible mechanism, and direct drive. HSST (High Speed Surface Transport) system is one of the magnetic levitation systems using LIM. In this system, the traction is controlled by LIM, and the levitation is controlled by EMS respectively. However, this systems have problems, for example the attractive force generated from LIM disturbs the levitation control of the EMS. We have proposed a new magnetic levitation system without EMS. In this system, the attractive force generated from LIM is used as the levitation force. We have also proposed a new control method of the thrust force and attractive force independently and simultaneously. It uses two frequency components. In this paper, we verify the control performance of propulsion and levitation by the experiments.
Analysison Pedestrian Out flow through an Exit with an Obstacle
Daichi Yanagisawa,Ayako Kimura,Akiyasu Tomoeda,Ryosuke Nishi,Yushi Suma,Kazumichi Ohtsuka,Katsuhiro Nishinari 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We have found that putting an obstacle in front of an exitin creases the pedestrian out flow through an exitinane vacuation situation from our experimets. In this paper, conflicts and turning, which affects the pedestrian out-flow significantly, is studied in detail to analyze the effect of an obstacle. In the floor field model, which is apedestri and ynamics modelu sing cellularauto mata, conflicts are taken in to account by the frictional parameter, which is not suffi-ciently realistic, and turning is neglected. Therefore, we have improved the frictional parameter to the frictional function, which is more realistic than the frictional parameter, and introduced the turning function, which represents the decrease in walking speeds when pedestrians turn. The frictional and the turning function clearly explain the mechanism of the effect of the obstacle, i.e., the obstacle blocks apedestrian moving to the exitand decreases the average number of pedestrians involved in the conflict.
Variable characteristics DC motor by changing brush lead angle to expand the operation range
Daichi Takura,Kan Akatsu 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a variable characteristics DC motor by changing a brush lead angle to expand the motor operation range. In the proposed method, to change the brushes angle of DC motor means to change the current phase flowing into a motor. By using this technique, the back-EMF can be variable, the motor driving range can be expanded. The definition of brush lead angle in this study is firstly explained. Next, it is shown that the brush lead angle is considered as a same meaning with a current lead angle of Permanent Magnet Synchronous Motors (PMSMs) by adapting dq theory to the DC motor. Adding that, a simulation result that the brush angle of DC motor determines the operation range is shown and effectiveness of the proposed method is verified by experiments. Finally it clarifies the drive range expansion with efficiency in each brush angle.
Daichi Ono,Satoru Izumi,Toru Abe,Takuo Suganuma 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Due to the diversification of devices and the spread of the Internet, many people are handling information over the network and the threat of cyber-attacks by unauthorized access and malware is also considered as a problem, and countermeasures against these threats are an urgent issue. SDN and OpenFlow are useful for network cybersecurity counter-measures because they can collect traffic statistics from switches and can interrupt communication at the switch level. In this study, we focus on detecting a port scanning as a preparation stage for cyber-attacks. In this paper, we propose port scan detection method based on the characteristics of Packet-In messages in an OF network. Also, we show its effectiveness through the experiments.
Daichi Yamauchi,Noritaka Sato,Yoshifumi Morita 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
The purpose of this paper was the experimental analysis of the three-dimensional motion of the knee joint. For this purpose, we prepared an android model of the knee joint that consists of the femur, the tibia, and the ligaments. Android models of human joints are anatomical models composed of the minimum number of parts required for reproduction of human movement. We constructed a drive unit to make the knee android model extend automatically and measured the motion of the knee android model during extension with a motion capture system. We compared the internal-external rotation and the anterior-posterior tibial translation of the knee android model with those of the human knee. Results showed that the internal-external rotation of the knee android model was similar to that of the human knee and that this motion is caused by the shape of the articular surfaces and the ligaments. However, screw-home movement did not occur in the knee android model, likely due to relaxation of the ligament cords in the knee android model. On the other hand, the knee android model could not reproduce the anterior-posterior translation of the human knee. This is possibly due to the lack of a meniscus in the knee android model.