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One solution for increasing the power density in Insulated Gate Bipolar Transistor (IGBT) module is to raise the maximum junction temperature (Tjmax) =175°C against conventional Tjmax=150°C. However, the challenges for Tjmax=175°C operation are the decreased power cycling (P/C) capability. We have already reported the failure mechanisms about P/C test and new technologies for improving P/C capability...
Multi-Pixel Photon Counter (MPPC) is solid-state photon counting device consisting of a Geiger-mode APD and quenching resistor at the most basic level. To improve the total fill factor of a MPPC array, we have adopted new technologies such as metal quenching resistors (MQR), through-silicon vias (TSV), stealth dicing (SD), and highly accurate assembly techniques. We have confirmed the reliability...
The reliability of IGBT chip surface electrode for bonding-wires is described. The power cycling (P/C) capability of an IGBT module is improved due to a suppression of chip surface aluminum (Al) electrode degradation with Nickel (Ni) plating. The P/C capability obtained with the Ni plating electrode is about 3 times higher than that with the Al electrode at a high temperature condition. Such a good...
A robot working with humans or other robots is supposed to be adaptive to changes in the environment. Reinforcement learning has been studied well for motor skill learning, robot behavior acquisition and adaptation of the behavior to the environmental changes. However, it is not practical that the robot learns and adapts its behavior only through trial and error by itself from scratch because huge...
A 5 year task is described on the research and development of the advanced humanitarian landmine detection system by using a compact discharge-type fusion neutron source called IECF (Inertial-Electrostatic Confinement fusion) device and 3 dual sensors made of BGO and NaI. With 107 D-D neutrons/s stably produced in steady-state mode, H-2.2 MeV, N-5.3, 10.8 MeV, gamma rays from (n, gamma) reaction with...
Both self-learning architecture (embedded structure) and explicit/implicit teaching from other agents (environmental design issue) are necessary not only for one behavior learning but more seriously for life-time behavior learning. This paper presents a method for a robot to understand unfamiliar behavior shown by others through the collaboration between behavior acquisition and recognition of observed...
In this paper, we propose a novel communication paradigm called group-oriented communication. Different from conventional unicast-based communications, group-oriented communication is entirely based on group-based communication. Our group-oriented communication is essentially a type of many-to- many communication, but it realizes any type of communications including one-to-one, one-to-many, many-to-one...
Life-time development of behavior learning seems based on not only self-learning architecture but also explicit/implicit teaching from other agents that is expected to accelerates the learning. This paper presents a method for a robot to understand unfamiliar behaviors shown by others through the collaboration between behavior acquisition and recognition of observed behaviors, where the state value...
The solder joint reliability of IGBT chip surface interconnection with a lead-frame structure is described in the power cycling (P/C) capability which is greatly improved due to a chip surface cooling effect in comparison with aluminum wire interconnection. The lead-frame is joined on a Ni and Au plated chip surface with Sn-Ag or Sn-Sb system solders. The P/C capability obtained with the Sn-Sb system...
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