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In previous work, the authors proposed an active common-mode filter (ACF) that is able to reduce the radiated noise from power cables connected to power converters and evaluated its radiated noise reduction effect by using an oscillator as a common-mode (CM) noise source. In this paper, this ACF is applied to a motor drive system fed by a PWM inverter, and the attenuation characteristics of the CM...
Nonparabolic subband structure of In0.53Ga0.47As/In0.52Al0.48As multi-quantum wells was studied theoretically and experimentally. In periodic potential of the multi-quantum-well structure, if barrier layers are thin, electron eigen-states become minibands having with energy width. In 10 nm width barrier, the energy width becomes wider at higher energy. When the eigen-state is more than 0.5 eV and...
We have numerically analyzed the relaxing effect for required tracking accuracy by the introduction of FMF based FSO receiver, and clarified 6-mode FMF provides a 2.2-times larger tolerance compared to the direct coupling to SMF.
We improved the coupling efficiency to the free-space optical receiver by using a few-mode fiber with the optical signal distorted with a turbulence emulator. We demonstrated digital maximum ratio combining over 10-Gb/s BPSK transmission mitigated fading, relaxing the required transmitted power by 5 dB.
We demonstrate record-low injection-current VOAs using strain-enhanced free-carrier absorption in SiGe. The strained SiGe VOA with optimized lateral PIN junction exhibits 20-dB attenuation by 20-mA/mm injection current. 2-GHz switching and error-free transmission of 50-Gbps WDM signal are also successfully demonstrated.
This paper demonstrates an advanced 1.1um pixel backside illuminated CMOS image sensor with a 3D stacked architecture. The carrier wafer in conventional BSI is replaced by ASIC wafer, which contains a part of periphery circuit and is connected to the sensor wafer through bonding technology. With proper layout design and process improvement, the impact of 3D connection (Through Via, TV) on the sensor...
In recent years, many researchers try to observe the state of the global environment from marine information. In this paper, we introduce the recording system of underwater environment. By using this system, we want to observe the change of global environment from the coral bleaching. Especially, we propose the generation method of marine tag in order to measure the 3D position of robot which is used...
We study on the modeling and solution of practical airline crew scheduling problems. The problem determines a feasible assignment of flight duties to the set of crews. Two types of integer programming formulations with cell model and graph models are developed. An efficient solution algorithm based on labeling algorithm is proposed. The validity of the proposed models is compared by using a general-purpose...
Recently, research on the habit of creatures and their characteristics are widely based on image processing. For example, the cricket Gryllus bimaculatus which consist of micro brain modifies its behavior by the situation and experience. In this paper, we constructed a technique of image observation to detect a cricket based on an advanced statistical feature, and automatically generated action trajectory...
Recently, image processing is widely used in research on the habits and characteristics creatures. For example, the medaka (Oryzias laptipes) which breeds quickly is popular used in various experiments. In particular, observing the behavior of the medaka is important to understanding the ecology of their characteristics. In this paper, we proposed the tracking method based on image processing for...
In-band interferers in wireless communication channels are due to the high order harmonics of multiple clock frequencies used by baseband digital signal processing in a single-chip solution. The impacts of in-band spurious tones on wireless performance are explored with hardware-in-the-loop simulation (HILS) of the LTE compliant systems. RF receiver circuits fabricated in a 65 nm CMOS technology are...
A long term evolution (LTE)-class CMOS radio frequency integrated circuit (RFIC) receiver test element group (TEG) chip is developed in our project for the next generation cell phone handsets in order to clarify the on-chip-level noise coupling and demonstrate the noise attenuation using the soft magnetic thin film as an on-chip electromagnetic noise suppressor. The TEG chip equips a noise generator...
Substrate noise coupling in RF receiver front end circuitry for LTE wireless communication was examined by full-chip level simulation and on-chip measurements, with a demonstrator built in a 65 nm CMOS technology. A complete simulation flow of full-chip level substrate noise coupling uses a decoupled modeling approach, where substrate noise waveforms drawn with a unified package-chip model of noise...
Recently, research on the habit of creatures and their characteristics are widely based on image processing. Observing the behavior of Gryllus bimaculatus is important to understanding the ecology of their characteristics. Therefore, in this paper, we introduced an image processing algorithm and constructed a technique of image observation to detect crickets based on an advanced statistical reach...
The tolerance of RF ICs against on-chip in-band interferers is diagnosed from the viewpoints of the quality of wireless channels compliant with LTE standards. The on-chip interferers inevitably propagate from other active circuits like digital backend processors through silicon substrate coupling in the same die of system-level integration. An in-system diagnosis platform of RF ICs presented in this...
In recent years, many groups have been studying redox sensor for chemical analysis. The Redox sensor has some strong points such as detecting multi-ion at a sensing area and detecting concentration of materials by voltage and current signal. For the redox sensor, decrements of sensing area size and detection limit of ion concentration are the competing demands. In this study, proposed Amplified Redox...
Secret sharing schemes have recently been considered to apply for cloud computing in which many users distribute multiple data to servers. However, when Shamir's (k, n) secret sharing is applied to cloud systems, the amount of share increases more than n times the amount of the secret. Therefore, in this paper we propose a new secret sharing scheme that can reduce the amount of share different from...
We investigated the effect of introducing artificial pinning centers (APCs) into (YBCO) thin films to reduce the microwave surface resistance in a high dc magnetic field for high-performance microwave devices with high-quality factor . YBCO thin films with and without APCs were deposited on MgO(100) substrates by using the pulsed laser...
In the development of communication based train control (CBTC) system, while communicating with the control center, the train must be assigned accurately to the wayside network. In order to verify the rigor of this process, the specification is analyzed formally in this paper. After studying the system, the functional requirements are clarified firstly. Followed by the formal specification is established...
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