Abstract: This paper presents a new image fingerprinting scheme which embeds a multi-bits
fingerprinting code and is robust against the geometric attack such as rotation, scaling and translation.
We construct a 64 bits fingerprinting code and embed into wavelet subband of 512x512 images
repeatedly. In order to restore an image from geometric distortion a noise reduction filter is performed
and a rectilinear tiling pattern is used as a template. Results of experimental studies show that our
method is robust against geometric distortions and JPEG compression.
Abstract: The ZnSe epilayers were grown on the GaAs substrate by hot wall epitaxy. After the
ZnSe epilayers treated in the vacuum-, Zn-, and Se-atmosphere, respectively. The defects of the
epilayer were investigated by means of the low-temperature photoluminescence measurement.
The dominant peaks at 2.7988 eV and 2.7937 eV obtained from the PL spectrum of the as-grown
ZnSe epilayer were found to be consistent with the upper and the lower polariton peak of the
exciton, I2 (Do, X), bounded to the neutral donor associated with the Se-vacancy. This donorimpurity
binding energy was calculated to be 25.3 meV. The exciton peak, I1
d, at 2.7812 eV was
confirmed to be bound to the neutral acceptor corresponded with the Zn-vacancy.
Abstract: CFRP laminate is sensitive to impacts. Even a low impact creates delamination, bringing
deterioration of the structural reliability. Monitoring for delamination is, therefore, indispensable to
maintain the reliability of a CFRP structure. In this study, asymmetrical dual charge electric potential
change method was introduced to estimate a delamination in the CFRP laminate. Delaminations were
estimated using response surfaces as solver of the inverse problem. Learning data of response surfaces
were calculated by FEM analyses. Actual delaminations in the CFRP laminate were successfully
Abstract: Resin transfer molding (RTM) process is getting popular for fabrications of complicated
commercial products made from Glass Fiber Reinforced Polymer (GFRP) at low cost. Cure
monitoring is indispensable for RTM process. In the present study, polyester resin is adopted for
matrix resin of the GFRP components. The polyester is usually adopted as matrix resin of the
low-cost GFRP products. Existing methods for the cure monitoring are, however, expensive for the
GFRP products. The polyester resin usually changes its optical property during curing. This enables
us to monitor the degree of cure by means of measurements of luminance change of the transmitted
light. Since the electrical circuit for measuring luminance change is not expensive, this system
utilizes the luminance change for monitoring cure is not expensive system. In the present study, the
sensing system employs a LED as a light source and plastic optical fibers as light paths. A
photodiode is adopted as a light power sensor. This low-cost cure-monitoring system is applied to
monitoring of degree of cure of polyester resin. Degree of cure is measured by means of
commercially available dielectric sensors, and results are compared with the results of luminance
change. The effectiveness of the method is confirmed experimentally here.
Abstract: We investigated the effect of SiOcap layer on the thermal stability of nickel and
nickel-cobalt silicide by measuring its sheet resistance. The stability of nickel silicide was
deteriorated as a function of annealing temperature, while that of nickel-cobalt silicide was not. In
case of both silicides, the SiOcap layer improved the stability. Tensile stress from the difference of
thermal expansion coefficients between SiO2 and nickel silicide may suppress the agglomeration of
Abstract: The corrosion behavior of pure titanium and Ti-6Al-4V alloy in NaF solutions and the
wettability of pure water on the specimens after corrosion were investigated. The relation between the
change of surface chemistry and roughness of specimens after corrosion and the wettability of pure
water droplets on such surfaces were discussed.
Abstract: We developed a device that makes possible the normal generation of low-temperature
plasma under atmospheric pressure. For plasma generation, a radio frequency of rf (13.56 MHz)
was used, for plasma gas, helium (He), and for material gases, acetylene (C2H2) and toluene
(C6H5CH3) were used. As a result of measuring Fourier transform infrared (FT-IR) after adding the
CO2 gas to the generated plasma, the absorption of C=O (carboxyl group) was observed around
1715 cm-1. When the flow rates of the added CO2 increased, the absorption peak increased at the
same time, and we knew that this originated from the CO2 molecules.
Abstract: We investigated the structural and electrical properties of the 0.5% Ce-doped
Ba(ZrxTi1-x)O3 (BZT) thin films with a mole fraction of x=0.2 and a thickness of 150 nm for the
MLCC (Multilayer Ceramic Capacitor) application. Ce-doped BZT films were prepared on
Pt/Ti/SiO2/Si substrates by a RF magnetron sputtering system as a function of Ar/O2 ratio and
substrate temperature. X-ray diffraction patterns were recorded for the samples deposited with three
different substrate temperatures. The thickness and the surface roughness of the films deposited with
different Ar/O2 ratios were measured. The oxygen gas, which was introduced during the film
deposition, had an influence on the growth rate and the roughness of the film. The surface roughness
and dielectric constant of the Ce-doped BZT film varied with Ar to O2 ratios (5:1, 2:1, and 1:1) from
1.21 nm to 2.33 nm and 84 to 149, respectively. The Ce-doped BZT film deposited at lower
temperature has small leakage current and higher breakdown voltage.
Abstract: Present study was conducted in order to expand the applications of acoustic emission
(AE) as a tool in evaluation of the recovery behavior of pure magnesium after deformation at room
temperature. From our previous research, we confirmed that AE from magnesium and its alloys
during recovery process at room temperature is a unique characteristic and AE measurement should
also be a promising approach in investigating such characteristic phenomenon. In present research,
magnesium with purity of 99.95% was selected as the main research objective, and the cylinder
specimen was compressed with strain rate of 1.67×10-4/s and unloaded with extremely high strain
rate of 0.56/s for the forthcoming AE evaluation in anelastic recovery process. The AE behavior
during anelastic recovery process and parameters such as anelastic recovery strain and twin
densities etc. were analyzed in detail. Pseudoelastic behavior of pure magnesium was considered to
be related to the detwinning and dislocation motions by the driving force of internal stress.
Abstract: The fretting wear arises when contacting surfaces undergo oscillatory tangential
displacement of small amplitude. Depending on the degree of stick and slip there are three kinds of
the contact motions, such as gross-slip, partial-slip and stick-slip. The fretting damage occurs most
severely when the transition from gross-slip to partial-slip happens. In this paper, the transitions of
friction and wear under fretting were investigated by ball-on-disk wear tests in various environments,
which were dry friction of air and nitrogen, and wet friction of mineral oil and engine oil. The
transition from partial-slip to stick-slip firstly occurred in nitrogen environment, and then in air. Later,
the transition occurred at higher load in mineral oil, and then lastly in engine oil.