Mitsubishi Electric

About: Mitsubishi Electric is a company organization based out in Ratingen, Germany. It is known for research contribution in the topics: Signal & Voltage. The organization has 23024 authors who have published 27591 publications receiving 255671 citations. The organization is also known as: Mitsubishi Electric Corporation & Mitsubishi Denki K.K..

Oscillator without a combinatorial loop and its threat to FPGA in data centre

Abstract: Virtual field-programmable gate array (FPGA) is an emerging technology to put multiple users in the same FPGA fabric with logical isolation. Security researchers have studied new threats in virtual FPGA and proposed attacks on the logical isolation by exploiting analogue natures of FPGA. These attacks use an oscillator comprising a combinatorial loop to have access to the analogue domain using digital components only. Interestingly, the system in the field prohibits a combinatorial loop by a design rule check. In this Letter, the authors study if prohibiting a combinatorial loop is sufficient to thwart the conventional attacks. They negatively answer the question by showing oscillators without a combinatorial loop. They also show how to detect and reject the proposed oscillators by a design rule check.

Light source lighting device and luminaire

Abstract: A power supply circuit drives circuits having different numbers of series-connected LEDs without changing a circuit constant or a component. An LED series circuit is connected to a power converter circuit of a power supply circuit. The power converter circuit is controlled by a control arithmetic circuit, and supplies a constant current to the LED series circuit. A voltage detection circuit detects a voltage applied to the LED series circuit. The control arithmetic circuit checks whether the LED series circuit has 40 LEDs or 20 LEDs, based on the voltage detected by the voltage detection circuit. The control arithmetic circuit holds a constant-current value table for 40 LEDs and a constant-current value table for 20 LEDs. In accordance with the detected voltage, the control arithmetic circuit selects one constant-current value table, and controls the power converter circuit based on the constant-current value table selected.

Silicon carbide semiconductor device and method for manufacturing same

Abstract: Provided is a silicon carbide semiconductor device wherein an electric field in a protection diffusion layer formed at a trench lower portion can be attenuated. A silicon carbide semiconductor device (100) is provided with: a first conductivity-type drift layer (2a); a first conductivity-type source region (4), which is formed at an upper portion in a semiconductor layer (2); an active trench (5a), which is formed by penetrating the source region (4) and a base region (3); a terminal trench (5b), which is formed around the active trench (5a); a gate insulating film (6), which is formed on the bottom surface and the side surfaces of the active trench (5a); a gate electrode (7), which is formed by being embedded in the active trench (5a) via the gate insulating film (6); a second conductivity-type protection diffusion layer (13), which is formed at a lower portion of the active trench (5a), and which has a first impurity concentration as a second conductivity-type impurity concentration; and a second conductivity-type terminal diffusion layer (16), which is formed at a lower portion of a terminal trench (5b), and which has a second impurity concentration as a second conductivity-type impurity concentration, said second impurity concentration being lower than the first impurity concentration.

Mechanism of Explosion Induced by Contact of Hypergolic Liquids

Abstract: The nature and mechanisms of explosions caused by the contact of hypergolic liquid propellants were investigated in detail for several combinations of fuels and oxidizers. It is shown that the explosion phenomena observed can be classified into three categories. 1) In the case of N2H4/NTO, sudden gasification of a superheated liquid layer formed at the boundary of two liquids occurs spontaneously and a detonation-like reaction proceeds in the reactive mixture produced. 2) In the cases of MMH/NTO and UDMH/NTO, the sudden gasification is caused by the shock of a local ignition, and a turbulent-combustion reaction proceeds in the reactive mixture produced. 3) In the cases of hydrazine type fuels/FNA, the sudden gasification occurs spontaneously as in the case of N2H4/NTO, but it is not augmented by chemical reaction, and in these cases the observed explosion is weak. Information on the vapor layer, which is formed between reactive fuel droplet and pool liquid plays an important role for the occurrence of explosion, is also given, that is based on the high-speed motion picture records.