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We demonstrated a simple scheme not only for terahertz (THz) generation with a grating-coupled LiNbO3 crystal, but also for single-shot detection of the generated THz field with a CMOS camera and a reflective echelon.
A GaInAsP/Si hybrid Fabry-Perot laser, fabricated by low temperature N2 plasma surface activated bonding on a Si substrate, was demonstrated. Lasing operation at room temperature was realized with a threshold current density of 0.85 kA/cm2.
Basic building blocks of power converters have been extracted for next generation 380 V DC distribution system. An approach has been proposed for realizing highly efficient and ultra-compact basic converters as bidirectional AC-DC converters, isolated DC-DC converters and non-isolated DC-DC converters. Based on the proposed approach, over 97 % efficient converters with 10 W/cm3 have been fabricated,...
Toward a GaInAsP/Si hybrid laser with an AlInAs oxidation current confinement structure, AlInAs oxidation on a III-V/Si by Surface Activated Bonding was demonstrated.
We propose a cup-shaped device called Cup-le for conversational experiment. Cup-le has various sensors to record participants' nonverbal behavior such as utterance. Cup-le saves the work of attaching sensors. Also, since Cup-le appears cup-shaped, it can sense without being aware of the sensor unlike conventional wearable sensors. Moreover, by attaching touch display, Cup-le can show information and...
We propose a room-shaped information environment called Ambient Suite that enhances interpersonal communication. In Ambient Suite, the room itself works as both sensors to estimate the conversation states of participants and displays to present information to stimulate conversation. This paper introduces an implementation assumed standing-party situations as a typical use case of Ambient Suite. From...
A novel approach has been proposed to expand the possibility of high-density converter design. The approach is based on series-parallel connection of low-power isolated dc-dc converters. A DC 384V - DC 384 V 2.4-kW isolated converter with 10 W/cm3 has been fabricated, and experimental results have been shown to confirm the validity of the proposed approach. An advanced approach to achieve more than...
A new approach has been proposed for creating higher power density 200Vac / 380Vdc converters to be installed in 380 V DC distribution systems. This approach requires a high density 3-Phase PWM converter. A SiC-JFETs and SiC-SBDs pair is attractive because of its low conduction loss created by a synchronous rectification and low switching loss by using uni-polar power devices. A design has already...
This paper describes methods for fault detection of railway vehicles and tracks. We examine fault detection of tracks using multi-resolution analysis into on-board measurement data as model-free approach. For fault detection of vehicles, we adapt interacting multiple-model (IMM) algorithm as model-based approach. We carried out simulation studies and field tests with actual vehicle. The results suggest...
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