Showing papers by "Mitsubishi Electric published in 2012"

Hyper Suprime-Cam

Abstract: Hyper Suprime-Cam (HSC) is an 870 Mega pixel prime focus camera for the 8.2 m Subaru telescope. The wide field corrector delivers sharp image of 0.25 arc-sec FWHM in r-band over the entire 1.5 degree (in diameter) field of view. The collimation of the camera with respect to the optical axis of the primary mirror is realized by hexapod actuators whose mechanical accuracy is few microns. As a result, we expect to have seeing limited image most of the time. Expected median seeing is 0.67 arc-sec FWHM in i-band. The sensor is a p-ch fully depleted CCD of 200 micron thickness (2048 x 4096 15 μm square pixel) and we employ 116 of them to pave the 50 cm focal plane. Minimum interval between exposures is roughly 30 seconds including reading out arrays, transferring data to the control computer and saving them to the hard drive. HSC uniquely features the combination of large primary mirror, wide field of view, sharp image and high sensitivity especially in red. This enables accurate shape measurement of faint galaxies which is critical for planned weak lensing survey to probe the nature of dark energy. The system is being assembled now and will see the first light in August 2012.

Stereoscopic video recording method, stereoscopic video recording medium, stereoscopic video reproducing method, stereoscopic video recording apparatus, and stereoscopic video reproducing apparatus

Abstract: The present invention is for more optimally performing recording and reproduction of stereoscopic video. In the present invention, parallax information is utilized to store, in a recording medium, stereoscopic video including left-eye images and right-eye images. Particularly, for video content that contains stereoscopic images, information is obtained regarding the amount of variation in parallactic angle having a given or larger value, a variation time that the variation in parallactic angle takes, and the number of times that the variation in parallactic angle occurs. An evaluation value is calculated that corresponds to the degree of eye fatigue on the basis of the amount of variation, the variation time, and the number of times of the variation. According to the present invention, the video content is encoded in such a manner that the evaluation value is within a given range, and then recorded in the recording medium.

Fully secure unbounded inner-product and attribute-based encryption

Abstract: In this paper, we present the first inner-product encryption (IPE) schemes that are unbounded in the sense that the public parameters do not impose additional limitations on the predicates and attributes used for encryption and decryption keys. All previous IPE schemes were bounded, or have a bound on the size of predicates and attributes given public parameters fixed at setup. The proposed unbounded IPE schemes are fully (adaptively) secure and fully attribute-hiding in the standard model under a standard assumption, the decisional linear (DLIN) assumption. In our unbounded IPE schemes, the inner-product relation is generalized, where the two vectors of inner-product can be different sizes and it provides a great improvement of efficiency in many applications. We also present the first fully secure unbounded attribute-based encryption (ABE) schemes, and the security is proven under the DLIN assumption in the standard model. To achieve these results, we develop novel techniques, indexing and consistent randomness amplification, on the (extended) dual system encryption technique and the dual pairing vector spaces (DPVS).

Shift register circuit

Abstract: A shift register circuit comprises a first transistor connected between a clock terminal and an output terminal, a second transistor for charging a control electrode of the first transistor in response to activation of an output signal of the preceding stage, a third transistor for discharging the control electrode of the first transistor, an inverter using a control electrode of the third transistor as an output end, and a fourth transistor which discharges an input end of the inverter at power-off and is turned off after power-on. A fifth transistor which is a load element of the inverter charges the control electrode of the third transistor at power-on. It is thereby possible to initialize the respective levels of the nodes without any external initialization signal and prevent a decrease in the level change rate of the output signal in the shift register circuit.

Adaptively attribute-hiding (hierarchical) inner product encryption

Abstract: This paper proposes the first inner product encryption (IPE) scheme that is adaptively secure and fully attribute-hiding (attribute-hiding in the sense of the definition by Katz, Sahai and Waters), while the existing IPE schemes are either fully attribute-hiding but selectively secure or adaptively secure but weakly attribute-hiding. The proposed IPE scheme is proven to be adaptively secure and fully attribute-hiding under the decisional linear assumption in the standard model. The IPE scheme is comparably as efficient as the existing attribute-hiding IPE schemes. We also present a variant of the proposed IPE scheme with the same security that achieves shorter public and secret keys. A hierarchical IPE scheme can be constructed that is also adaptively secure and fully attribute-hiding under the same assumption. In this paper, we extend the dual system encryption technique by Waters into a more general manner, in which new forms of ciphertext and secret keys are employed and new types of information theoretical tricks are introduced along with several forms of computational reduction.

In-vehicle apparatus and program

Abstract: An ASL is associated with an APP module having as a communication target an existing APP SW-C( 1 ). A buffer part accumulates data to the existing APP SW-C( 1 ) and data from the existing APP SW-C( 1 ). A communication processing part transmits the data to the existing APP SW-C( 1 ) accumulated in the buffer part to the existing APP SW-C( 1 ), receives data transmitted from the existing APP SW-C( 1 ), and stores the received data in the buffer part. An API processing part receives as input from the APP module data to the existing APP SW-C( 1 ), stores the data received as input in the buffer part, receives as input from the buffer part data from the existing APP SW-C( 1 ), and outputs the data received as input to the APP module.

Concise and tight security analysis of the Bennett-Brassard 1984 protocol with finite key lengths

Abstract: We present a tight security analysis of the Bennett–Brassard 1984 protocol taking into account the finite-size effect of key distillation and achieving unconditional security. We begin by presenting a concise analysis utilizing the normal approximation of the hypergeometric function. Next we show that a similar tight bound can also be obtained by a rigorous argument without relying on any approximation. In particular, for the convenience of experimentalists who wish to evaluate the security of their quantum key distribution systems, we also give the explicit procedures of our key distillation and show how to calculate the secret key rate and the security parameter from a given set of experimental parameters. In addition to the exact values of key rates and security parameters, we also describe how to obtain their rough estimates using the normal approximation.

Touch panel and display device including the same

Abstract: A touch screen of a touch panel includes plural detection column wirings and plural detection row wirings that cross the detection column wirings. Dummy column wirings having a similar configuration to that of the detection column wirings are arrayed at further outer sides of outermost detection column wirings out of the plural detection column wirings. Dummy row wirings having a similar configuration to that of the detection row wirings are arrayed at further outer sides of outermost detection row wirings out of the plural detection row wirings.

Integer low-density lattices based on construction A

Abstract: We describe a new family of integer lattices built from construction A and non-binary LDPC codes. An iterative message-passing algorithm suitable for decoding in high dimensions is proposed. This family of lattices, referred to as LDA lattices, follows the recent transition of Euclidean codes from their classical theory to their modern approach as announced by the pioneering work of Loeliger (1997), Erez, Litsyn, and Zamir (2004–2005). Besides their excellent performance near the capacity limit, LDA lattice construction is conceptually simpler than previously proposed lattices based on multiple nested binary codes and LDA decoding is less complex than real-valued message passing.

Group signatures with message-dependent opening

Abstract: This paper introduces a new capability of the group signature, called message-dependent opening. It is intended to weaken the higher trust put on an opener, that is, no anonymity against an opener is provided by ordinary group signature. In a group signature system with message-dependent opening (GS-MDO), in addition to the opener, we set up the admitter which is not able to open any user's identity but admits the opener to open signatures by specifying messages whose signatures should be opened. For any signature whose corresponding message is not specified by the admitter, the opener cannot extract the signer's identity from it. In this paper, we present formal definitions and constructions of GS-MDO. Furthermore, we also show that GS-MDO implies identity-based encryption, and thus for designing a GS-MDO scheme, identity-based encryption is crucial. Actually, we propose a generic construction of GS-MDO from identity-based encryption and adaptive NIZK proofs, and its specific instantiation from the Groth-Sahai proof system by constructing a new (k-resilient) identity-based encryption scheme which is compatible to the Groth-Sahai proof.

Light source device and surface light source device equipped with same

Abstract: A light source device comprising: a point light source for emitting light; a light source substrate directly mounting the point light source; a light source substrate cover having a through hole or a notch in a position to which the point light source corresponds, the light source substrate cover arranged opposite to a surface of the light source substrate on which the point light source is mounted; and a support member for supporting the light source substrate, the support member arranged to be opposed to the reverse side of the mounting surface of the light source substrate, the support member has a substantially same size with the light source substrate; wherein the light source substrate cover and the support member sandwich the light source substrate to support the light source substrate.

Servo control device

Abstract: A reference model unit calculates a model position, with which a model of a controlled object follows a position command, and a model torque for the model of the controlled object to operate to coincide with the model position. A gain changing unit changes, during the operation of the controlled object, at least a value of one control gain of first-order and second-order control gains used for calculation of a variable compensation value output to an integral compensator by a variable-compensation calculating unit based on at least one of the model position, a position detection value, and a torque command output to the controlled object by a torque adder, and reflects the value on calculation of the variable compensation value.

Electric power steering device

Abstract: An electric power steering device includes: a fail-safe power relay (9a) and a motor relay (10a) for interrupting power supply to an electric-motor driving unit for driving an electric motor for applying an assist torque for steering performed by a driver; and a relay driving circuit (8a) including a switch (13a) connected in parallel to drive coils of the relays (9a and 10a) and a diode (16a). A target value of a relay-contact energizing current is lowered and the relays (9a and 10a) are gradually interrupted while an amount of current corresponding to a back surge generated when the relays are turned OFF is caused to flow back to the diode (16a) of the relay driving circuit (8a) in a normal relay-OFF operation, whereas the relays (9a and 10a) are quickly interrupted without operating the relay driving circuit (8a) in case of detection of an abnormality.

Touch screen, touch panel, and display device including the same

Abstract: A touch screen includes a base substrate, a bundle of rectangular wirings in a column direction including a plurality of detection column wirings that are electrically connected in common, and a bundle of rectangular wirings in a row direction including a plurality of detection row wirings that are electrically connected in common, the bundle of wirings being formed on the base substrate. Also, a plurality of block areas obtained by dividing an intersection area in which the bundle of wirings in the column direction and the bundle of wirings in the row direction intersect in a plan view are defined, and only the detection column wiring or only the detection row wiring is provided in each of the block areas.

What can be inferred from a tactile arrayed sensor in autonomous in-hand manipulation?

Abstract: In this paper, we present a concept of using tactile sensors as sufficient tools in localizing, recognizing an object in robotic in-hand manipulation tasks. Our approach operates on a moderately intensive array data that are obtained from a tactile sensor when a robotic gripper grasps an object that is small relatively to fingers. In stead of using tactile data as an array of discrete numbers, we treat it as a grayscale image. By working with successive images from tactile sensor exploiting image processing tools, we are able to extract rich information about the contact condition between an object and the gripper. Experimental results show that from the processed data, we can realize the grasped object's position/orientation, contact shape, especially the stick-slip condition on the contact surface that is derived for the first time for this sensor. Based on localized displacement phenomenon of a sliding soft object, we proposed an approach to detect the slippage quantitatively, and conducted a wide range of experiment in term of characteristics of object's movement. We also conducted a model for an object-grasping gripper with tactile feedback in various postures of the object, and a corresponding experiment setup to validate computed results. Presented result is expected to be used widely in the community due to its simplicity and reliability.

Two-million-pixel SOI diode uncooled IRFPA with 15μm pixel pitch

Abstract: We report the development of a 2-million-pixel, that is, a 2000 x 1000 array format, SOI diode uncooled IRFPA with 15 mm pixel pitch. The combination of the shrinkable 2-in-1 SOI diode pixel technology, which we proposed last year [1], and the uncooled IRFPA stitching technology has successfully achieved a 2-million-pixel array format. The chip size is 40.30 mm x 24.75 mm. Ten-series diodes are arranged in a 15 mm pixel. In spite of the increase to 2-million-pixels, a frame rate of 30 Hz, which is the same frame rate as our former generation (25 mm pixel pitch) VGA IRFPA, can be supported by the adoption of readout circuits with four outputs. NETDs are designed to be 60 mK (f/1.0, 15 Hz) and 84 mK (f/1.0, 30 Hz), respectively and a tth is designed to be 12 msec. We performed the fabrication of the 2-million-pixel SOI diode uncooled IRFPAs with 15 mm pixel pitch, and confirmed favorable diode pixel characteristics and IRFPA operation where the evaluated NETD and tth were 65 mK (f/1.0, 15 Hz) and 12 msec, respectively.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Magnetic sensor device

Abstract: A magnetic sensor device comprises a first magnet (6) and a second magnet (7) which are disposed on mutually opposite sides of a conveyance path (2), and each of the magnetic poles of the first magnet (6) faces the magnetic pole of the second magnet (7) different therefrom. The first magnet (6) and the second magnet (7) generate a cross magnetic field wherein the magnetic field strength in a spacing direction, which is perpendicular to a conveyance direction, is within a predetermined range. An AMR element (10) is positioned in a strong magnetic field strength region, in which the magnetic field strength of the cross magnetic field in the spacing direction is within a predetermined range, and detects, as a change in a resistance value, a change in the component of the cross magnetic field in the conveyance direction caused by an object (5) to be detected. A multi-layer board (9) outputs the change in the resistance value detected by the AMR element (10) to a processing circuit (15).

Drive assistance device

Abstract: A stopping vehicle estimating unit estimates one of a number of stopping vehicles and a length of a stopping vehicle line of different vehicles that are stopping at a traffic light along an estimated driving route ahead of the own vehicle closer to the traffic light than the own vehicle, based on a position information of a site at which a traffic light is provided, an own vehicle position, an own vehicle speed, and traffic information. A passable time zone estimating unit estimates a passable time zone during which the own vehicle is able to pass by the traffic light, based on the one of the number of stopping vehicles and the length of the stopping vehicle line that have been estimated by the stopping vehicle estimating unit, and on schedule information.

Internal combustion engine control apparatus

Abstract: An internal combustion engine control apparatus includes a pseudo knock determination unit that determines whether or not a pseudo knock has been produced in a knock detection window, based on at least one of the frequency, a status amount indicating a rotation speed of the internal combustion engine, a status amount indicating a load of the internal combustion engine, and a status amount indicating an air-fuel ratio of the internal combustion engine; and a moving-average processing unit that sets a second period to a period that is approximately the same as a first period, in the case where it has been determined that the pseudo knock was not produced, and that does not implement moving-averaging or sets the second period to a period that is narrower than the first period, in the case where it has been determined that a pseudo knock was produced.

Discharging proof obligations from atelier b using multiple automated provers

Abstract: We present a method to discharge proof obligations from Atelier B using multiple SMT solvers. It is based on a faithful modeling of B's set theory into polymorphic first-order logic. We report on two case studies demonstrating a significant improvement in the ratio of obligations that are automatically discharged.

Synchronous machine control apparatus

Abstract: A control command generator that generates an armature interlinkage flux command and a torque current command by a torque command, a rotation speed, and an operation target command, includes a first flux command generator generating a first flux command by the toque command or the torque current command, a second flux generator generating a second flux command by the torque command or the torque current command and the rotation speed of the synchronous machine, a command allocation setting unit setting an allocation coefficient equivalent to an allocation ratio of the two first and second flux commands by the operation target command, a flux command adjuster outputting an armature interlinkage flux command by the two flux commands and the allocation coefficient, and a torque current command generator generating the torque current command by the torque command and the armature interlinkage flux command.

Mode-evolution-based polarization rotator-splitter design via simple fabrication process.

Abstract: A mode-evolution-based polarization rotator-splitter built on InP substrate is proposed by combining a mode converter and an adiabatic asymmetric Y-coupler. The mode converter, consisting of a bi-level taper and a width taper, effectively converts the fundamental TM mode into the second order TE mode without changing the polarization of the fundamental TE mode. The following adiabatic asymmetric Y-coupler splits the fundamental and the second order TE modes and also converts the second order TE mode into the fundamental TE mode. A shallow etched structure is proposed for the width taper to enhance the polarization conversion efficiency. The device has a total length of 1350 µm, a polarization extinction ratio over 25 dB and an insertion loss below 0.5 dB both for TE and TM modes, over the wavelength range from 1528 to 1612 nm covering all C + L band. Because the device is designed based on mode evolution principle, it has a large fabrication tolerance. The insertion loss remains below 1 dB and the polarization extinction ratio remains over 17 dB with respect to a width variation of +/− 0.12 µm at the wavelength of 1570 nm, or +/− 0.08 µm over the entire C + L band.

What’s the Frequency, Kenneth?: Sublinear Fourier Sampling Off the Grid

Abstract: We design a sublinear Fourier sampling algorithm for a case of sparse off-grid frequency recovery. These are signals with the form $$f(t) = \sum _{j=1}^k a_j \mathrm{e}^{i\omega _j t} + \int u (\omega )\mathrm{e}^{i\omega t}d\mu (\omega )$$f(t)=?j=1kajei?jt+??(?)ei?tdμ(?); i.e., exponential polynomials with a noise term. The frequencies $$\{\omega _j\}$${?j} satisfy $$\omega _j\in [\eta ,2\pi -\eta ]$$?j?[?,2?-?] and $$\min _{i e j} |\omega _i-\omega _j|\ge \eta $$mini?j|?i-?j|?? for some $$\eta > 0$$?>0. We design a sublinear time randomized algorithm which, for any $$\epsilon \in (0,\eta /k]$$∈?(0,?/k], which takes $$O(k\log k\log (1/\epsilon )(\log k+\log (\Vert a\Vert _1/\Vert u \Vert _1))$$O(klogklog(1/∈)(logk+log(?a?1/???1)) samples of $$f(t)$$f(t) and runs in time proportional to number of samples, recovering $$\omega _j'\approx \omega _j$$?j???j and $$a_j'\approx a_j$$aj??aj such that, with probability $$\varOmega (1)$$Ω(1), the approximation error satisfies $$|\omega _j'-\omega _j|\le \epsilon $$|?j?-?j|≤∈ and $$|a_j-a_j'|\le \Vert u \Vert _1/k$$|aj-aj?|≤???1/k for all $$j$$j with $$|a_j|\ge \Vert u \Vert _1/k$$|aj|????1/k. We apply our model and algorithm to bearing estimation or source localization and discuss their implications for receiver array processing.

Permanent-magnet type rotating electrical machine

Abstract: Provided is a permanent-magnet type rotating electrical machine that can detect the position of a rotor with high precision upon executing sensor-less driving. The permanent-magnet type rotating electrical machine is provided with a rotor that has a plurality of magnetic poles arranged thereon with regular intervals, and a stator that comprises a plurality of teeth and armature windings. The permanent-magnet type rotating electrical machine has a high-frequency voltage having a frequency and amplitude different from those of a torque-generating voltage applied to the armature windings, and has the positions of the magnetic poles of the rotor estimated using a current trajectory of a high-frequency current that was measured. The permanent-magnet type rotating electrical machine is formed such that, when the measured high-frequency current is dq converted, current trajectory on dq axes will become an ellipse shape, and such that the angle fluctuation range of the major axis of the ellipse with respect to load current and rotor position will enable a prescribed position-estimating resolution.

Leakage resistance detection device for an on-board high voltage device and leakage resistance detection method therefor

Abstract: The leakage resistance detection device includes a coupling capacitor having one terminal connected to an on-board high voltage device and another terminal connected to a repetitive signal output circuit, and measures a leakage resistance as a function of a transition time during which a monitoring voltage, which is a potential at the another terminal of the coupling capacitor to be charged/discharged in response to an operation of a charge/discharge switching element that operates in response to a repetitive pulse signal, changes from one predetermined voltage to reach another predetermined voltage. When the measured leakage resistance has become equal to or smaller than a predetermined limit leakage resistance, the leakage resistance detection device generates a resistance abnormality determination output.

Two-screen display device

Abstract: A two-screen display device, in which an increase of production cost can be suppressed while the same resolution as an image of a usual (one-screen display) device is maintained, is provided. In a liquid crystal display panel of the two-screen display device, each of a first sub-pixel for first image and a second sub-pixel for second image has an aspect ratio of about 6:1. A source line supplies an image signal to both the first sub-pixel and the second sub-pixel. Each row of the sub-pixel includes a gate line (first gate line) that drives the first sub-pixel and a gate line (second gate line) that drives the second sub-pixel. An opening of a parallax barrier is disposed in a region between the first sub-pixel and the second sub-pixel.

Safety device for elevator and rope slip detection method

Abstract: In a safety system for an elevator, slip detection means detects a slip between a drive sheave and a main rope. A safety gear is mounted to a car, the safety gear being electrically operated by an actuator to cause the car to make an emergency stop regardless of whether a running direction of the car is upward or downward. A safety gear controller cuts power supply to a hoisting machine motor and causes the safety gear to make a braking operation upon detection of the slip between the drive sheave and the main rope by the slip detection means.

A treatment planning comparison of passive-scattering and intensity-modulated proton therapy for typical tumor sites.

Abstract: Intensity-modulated proton therapy (IMPT) is expected to improve treatment results with fewer side effects than other proton therapies. The purpose of this study was to evaluate the tumor sites for which IMPT was effective under the same beam calculation conditions by planning IMPT for typical cases treated with passive scattering proton therapy (PSPT). We selected 16 cases of nasal cavity, lung, liver or prostate cancers as typical tumor sites receiving PSPT. The dose distributions and dose volume histograms optimized by the IMPT were compared with those optimized by the PSPT. We took particular note of the doses to the skin and organs at risk (OAR) when PSPT was replaced by IMPT. Furthermore, an improvement of the beam angles was also performed to obtain better dose distributions in the IMPT. The IMPT with the same beam angles resulted in near-maximum doses to the skin of average 78%, 64%, 84% and 99% of the PSPT doses for nasal cavity, lung, liver, and prostate cancers, respectively. However, it was difficult to improve the dose homogeneity of the target volume. The change of the IMPT beam angles could reduce the doses to OARs and skin in the case of the nasal cavity, while it had limited effect in the other cases. We concluded that IMPT was effective for reducing the doses to some OARs when treating nasal cavity, lung, liver and prostate cancers. The selection of beam angles was important in the IMPT optimization, especially for nasal cavity cancers.

Mechanically and electrically integrated module

Abstract: An inverter apparatus is incorporated integrally into a non-load-side of a motor such that an inverter cooler is interposed, and a non-load-side end frame of the motor includes: a flat base portion; a cylindrical non-load-side bearing portion that is disposed so as to protrude axially from near a center of a front surface of the base portion that faces a rotor, and that houses and holds a non-load-side bearing into which a non-load-side end portion of a rotating shaft of the rotor is mounted; and an annular first flange portion that is disposed so as to protrude axially from an outer circumferential edge portion of the front surface of the base portion so as to contact a non-load-side end surface of a cylindrical portion and a cylindrical member.