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We analyzed SiO2 void volumes formed on samples which failed during TDDB tests by constructing three-dimensional (3D) images in FIB-SEM system. We succeeded in visualizing the breakdown spots within SiO2 on 4H-SiC substrates and provided clear evidence of the influence of SiO2 void volume on 4H-SiC TDDB failure (ex. Tbd or Rbd). The small SiO2 voids play a very important role in the degradation of...
We have been developing superconducting transformer for high speed train. Its objects are reducing the weight and energy consumption. We have developed 4MVA class superconducting transformer in 2004. After that, we have improved the efficiency from 96% to 98%. We also have developed 1kW prototype lightweight refrigerator which is essential to realize superconducting transformer.
In order to assure the quality of software product, early detection of fault-prone products is necessary. Fault-prone module detection is one of the major and traditional area of software engineering. However, comparative study using the fair environment rarely conducted so far because there is little data publicly available. This paper tries to conduct a comparative study of fault-prone module detection...
Fault-prone module detection is important for assurance of software quality. We have proposed a novel approach for detecting fault-prone modules using spam filtering technique, named Fault-proneness filtering. In order to show the effectiveness of fault-proneness filtering, we conducted comparative study with a static code analysis tool, PMD. In the study, Fault-proneness filtering obtains higher...
In this paper we introduce our new protocol, RSOCKS which enables Internet client to access to the server in the guarded network inside NAT/FW. There are some methods to solve this problem, including the port forwarding and SOCKS. However these protocols assume the situation that the server application is installed a server computer and fixed to the network. In the future it is thought that the application...
We developed novel energy-storage equipment that is series-connected to DC side of traction inverter of DC electric railway vehicle. When a train is powering and braking at a high-speed and the equipment boosts an input voltage of the traction inverter, the motor torque increases. Consequently, the mechanical brake force, compensating the electric brake force, becomes less. That leads to less energy...
The Linee is a software of Linux, which emulates the Ethernet. We have been developing it for opensource license. The Linee is inserted between two Ethernet segments like a bridge hub and can generate the line disturbances which are delay, frame discards and policing. Because Linee is a software you can use your PC as an Ethernet emulator. It works as a repeater hub rather than a router. Thus it is...
We have developed a 160 times 120 SOI (silicon on insulator) diode uncooled IRFPA (Infrared Focal Plane Array) with 25 mum pixel pitch for a small IR camera. The IRFPA has a highly responsive pixel structure and is packaged in a chip scale vacuum package (CSVP) in order to reduce the package size. The size of the package is 14.5(L) times 13.5(W) times 1.2(H) mm. An infrared image of less than 60 mK...
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