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Er2SiO5 crystal shows strong and sharp Er-related PL emissions at room temperature. It is expected as a basic material of waveguide amplifiers in silicon photonics. Recently we have proposed Er2SiO5 crystal preparation by Pulsed Laser Deposition (PLD) method for device applications. In this paper we introduce PLD approach to modify crystalline structures of Er2SiO5 crystal and the related materials...
Enhanced Er3+ luminescence of Er silicate through Y and Yb co-doping were observed in different pump wavelengths of 654 nm and 980 nm, respectively, and corresponding excited mechanism was discussed.
ErxY2-xSiO5 (x=0.1~2) crystalline thin films with the same structure of Er2SiO5 crystal are demonstrated. ErxY2-xSiO5 films with various x values were prepared by the sol-gel method. ErxY2-xSiO5 films show a highly-ordered crystalline structure still for x~0.1. With decreasing the Er content, the photoluminescence intensity was almost constant till x~0.5, and then increased strongly for x below 0...
Removing noise while preserving and enhancing edges is one of the most fundamental operations of image/video processing. However, removing noise and edge enhancement are conflicting requests, thus it is difficult to realize these two requests at the same time. Zhang and Allebach have proposed the adaptive bilateral filter (ABF) in order to realize the nose removing and edge enhancement at the same...
Large particle accelerator projects like the European X-ray Free Electron LASER (XFEL), which is under construction at DESY in Hamburg (Germany), or like the planned International Linear Collider (ILC) favor MBKs for their ability to generate high rf output powers at moderate electron beam energies. For the XFEL, Deutsches Electronen Synchrotron (DESY) ordered a prototype of a horizontally oriented,...
We consider that the multilayered organic DFB structure proposed in this study would be a promising concept for development of the compact-type multicolour laser light source. The white laser light source, which shows simultaneous R, G, and B colour DFB lasing, will be realized by the marginal optimisations of the operation wavelengths and relative emission intensities.
This paper proposes a functionally layered video coding for robot vision network. Video signals from mobile robots are regularly transmitted to a remote robot. It uses the video to estimate locations of each of the mobile robots. As the need arises, a person browses the video to check the scenery. In such occasion, the functionally layered video coding regularly transmits the minimum components necessary...
It is very important to develop 3D audio display systems compatible with future 3D visual displays in order to realize future 3D multimodal communications systems such as 3D television. In this paper, two 3D audio display systems using the radiated loudspeaker, that were developed by the authors, are described. In one system, the spherical radiated loudspeaker, which consists of 26 loudspeaker units...
A new design method called MORDE (multi-objective robust design exploration), which conducts both a multi-objective robust optimization and data mining for analyzing trade-offs, is proposed. For the robust optimization, probabilistic representation of design parameters is incorporated into a multi-objective genetic algorithm. The means and standard deviations of responses of evaluation functions to...
We describe the simulation of an inductive output tube (IOT) using the particle-in-cell code MAGIC. Simulations were performed to analyze three basic processes in an IOT: formation of bunched electrons beams from a gridded electron gun, interaction between bunched beams and rf field in a resonator, and spent beam collection with a multi-stage depressed collector. There is excellent agreement between...
CPI has designed and is currently in the process of building a prototype of a horizontally oriented, ges10 MW, ges65% efficiency multiple beam klystron (MBK) operating at 1300 MHz. The klystron, designated the VKL-8301B, was ordered by DESY for the European XFEL. The klystron was designed using of sate-of-the-art multi-dimensional design codes to ensure that all performance requirements are exceeded...
Final design and fabrication are in progress on a 350 MHz, 200 kW CW, multiple beam, inductive output tube (IOT). The device includes seven electron guns in a circular array. A single input cavity drives the fields for all seven electron guns. RF power is generated in a single output cavity. The device is predicted to achieve approximately 70% efficiency with 22 dB gain.
We have realized a sound directivity control of a large planar diaphragm by controlling the bending vibrations using multiple vibrators. This paper proposes a method to determine the parameters such as the shape and thickness of the diaphragm and the position of the vibrators. In this method, the finite element method (FEM) is used to simulate the diaphragm vibrations and the boundary element method...
Bit-length (i.e., resolution of signal amplitude) of digital images is decided by the quantization. The bit-length expansion technique is necessity for the high-quality display such as the liquid crystal display (LCD) and the plasma display. Since, these displays have more the 10 bit resolution for each color component. However, in general, color image signals are defined by 8 bit resolution for each...
The development of a teleoperated robot for USAR (Urban Search And Rescue) activities has been discussed in the paper. Suitable camera view angle of the USAR robot has been examined by using simulation and it has been shown that wider angle than common usual camera is better for the robot. Isotropic bumping and touching object(IBO) has been proposed for the grouser of the robot crawler in order to...
The design and current status of EarthCARE/CPR are described in this report. Basic design of CPR will be confirmed in this year, and engineering model development and testing will be done this year and the next year. In parallel with the development activity of CPR, algorithm development activity is in progress. The data from CPR is expected to contribute to reveal the detailed information of clouds...
Flight control simulators for fixed-wing aircraft and VTOL (Vertical Take-off and Landing) aircraft have been developed for understanding flight control dynamics and for improving control strategies and performances. They simulate automatic control of a flight path of the aircraft, using six-degree-of-freedom nonlinear equations to represent aircraft dynamics. The control system is multi-layered....
A conventional 3D sound field reproduction system using wave field synthesis places a lot of loudspeakers around the listener. However, since such a system is very expensive and loudspeakers come into the listener's field of vision, it is very difficult to construct an audio-visual system with it. We developed and evaluated a 3D sound field reproduction system using eight loudspeakers placed at the...
In this report, we propose a new video communication method for the robot vision network in which video signals are shared by "robots" and "humans". A conventional compression algorithm, such as JPEG or MPEG discards component signals insensitive to human eyes, e.g. high frequency band and tiny signals. On the contrary, the proposed method transmits minimum components necessary...
Two erbium compound films, Er2SiO5 and Er2O3 were fabricated by sol-gel method using two kinds of starting sol solutions, respectively, and corresponding structure and photoluminescence properties were studied.
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