工学部紀要理工編 抄録（Vol.22 No.1）

Recently Plasma Display Panels (PDPs) are putting into the market of the TV-like video image displays in which CRTs have been the one and only devices for a long time. However, some problems are remained to be improved, yet, such as the insufficient brightness and high power consumption in order to widely spread into homes. These problems are due to the insufficient luminous efficiency of the devices. This paper describes a historical review on the improvement of the luminance and luminous efficiency in PDPs, and discusses about the necessity for further improvement of the luminous efficiency.

Proteins are natural polymers which are assembled under nucleic acid control from a menu comprising L-α-amino acids. Peptide bonds link the building blocks, giving macromolecules with polypeptide backbones and side-chains containing a variety of simple functionalities according to the amino acids selected. The structures are elaborated by non-covalent association, which is the fundamental concept of "supramolecular chemistry".

Spherical BaTiO3 fine powders were synthesized by emulsion-char method using titanium tetraisopropoxide, citric anhydride and barium carbonate as the aqueous phase, high boiling-temp. oil (Hi-CALL K-350) and low boiling-temp. oil (ISOPAR-M) as the organic phase and surfactant, Span 80 as the emulsifier. On preparation of emulsion of aqueous BaTiO3 precursor solution, it was found that 1.22 gravity of the aquous solusion, 0.03 mixing ratio of aqueous solution/organic phase, 0.2 mixing ratio of high boiling-temp. oil/low boiling-temp. oil and 1.97g/100ml mixing quantity of the surfactant produced stable water-in-oil (w/o) type emulsions by mechanical stirrring. Spherical fine powders were produced from evaporation of the w/o emulsions. On preparation of sintered BaTiO3, calcination temperature and sintering temperature were examined.

In this note, the dynamics of real cubic polynomials is considered. Especially, in the parameter space, landing of stretching rays at critically prefixed polynomials is investigated. It turns out that an interval worth of stretching rays land at such points.

The cyclodextrin(CD) inclusion complex showed a chiral recognition observed by linked scan FAB-MS. The ratio, R, of the daughter ionic peak strength to the precursor ionic peak strength using the linked scan FAB-MS method was suggested to express a parameter for the stability of CD inclusion complex. The ratios between RD and RL were determined in inclusion complexes consisted of D-and L-N -dansyl-phenylalanines with various CDs. As for this parameter R derived from the linked scan FAB-MS ionic peaks, the wide application is possible to the inclusion complexes and the evaluation of the chiral recognition in various inclusion complexes.

In this article we experimentally reconstruct Hodge theory by means of lifting of Frobenius action and Fourier-Deligne-Sato transformation suppressing inner couplings. We based on the argument of second proofs of Weil conjecture by Laumon and proposed the substitution of Tate twist in l-adic Hodge theory.

The purpose of our studies is to explain how the water is used and how the space effects of using water are designed in architecture. We in our laboratory have surveyed many architectural works in which water is used, visiting the architectural works and experiencing the spaces. In this paper, limiting the subject to the way of using water surface, 15 fieldwork cases of architectural works in which water surface is used were made objects for analysis.
First, we pointed out that the character and role of a water surface differed depending on its position, whether it was on the access side or the garden side, and also on the access side whether it separated the building from the access way or separated the building and the access way from the surroundings. The works of architects Ando, Taniguchi and Yanagisawa, each with more than one case had distinct tendency and characteristics in their way of using water surface, they represented three types. In fieldwork cases of other architects one of the above three types could be seen. Secondly, regarding the size of water surface, when based on the ratio of water suface area to the building area, each architect had his own tendency. Their way of using water surface could be said to reflect those tendencies. These tendencies were also seen in the similar types of fieldwork cases of other architects.

Duplexers are usually used between the antenna and the equipments such as the transmitter and the receiver to separate their signals.
In the portable movable communications, however, the frequency bands exist in arround about 0.9 and 1.8GHz. The co_used equipments available to the dual band will be demmanded to make low cost in future. This paper, therefore, presents the proposed dual band duplexers and the theory of the design to meet the requirement mentioned above, where the several types with multicoupled TEM lines in high dielectric material are proposed. In the proposed constructions, there are not only the interdigital coupling and lumped element coupling used in the past but also the newly proposed distributed reactive coupling for the duplexing function.
This paper, therefore, is especially focused on the design theory of the distributed reactive coupling in connection with the newly proposed construction, and shows the good agreements with experimental results.
The techniques and the theory will be available to not only such a devices mentioned above, but also other microwave circuits in general.

A method of extracting features for making a wire-frame (line drawing) that is constructed by eight surfaces from an image data of a car is introduced. This method is constructed by the following three steps: In the first step, two surfaces are extracted from the silhouette of the car using degree of change in angles of straight lines that are observed from the outline of the car image. In the second step, a surface is extracted by brightness gradation of pixels in the inside of the silhouette. And in the third step, three surfaces, that are watched barely and can not be observed accuracy, are estimated using relationship of the already extracted lines. The system that can extract the wire-frame from a miniature car image and can calculate thirty kinds of feature values is constructed. As the result of experiments using 35 input images by nine kinds of miniature cars, 19 images are succeeded in extracting correct wire-frame of the cars. This method will be expected to provide some good features for recognition of a kind of cars / car names.

This paper proposes an effective method for generating a mesh for the radiosity calculation. The proposed method introduces "the zero triangle"-an imaginary triangle with an area of zero-to circumvent the creation of the T-vertices. The method also restricts the element shape to the triangle. These greatly simplify the meshing process, which results in reducing the processing time. The quality of images rendered by the proposed method is comparable to the one by the adaptive meshing algorithm.

This paper intends to introduce the standardization activities of ISO/TC130 (Graphic Technology) as related to our research and studies. In Chapter 1, after introducing a little bit about ISO and the standardization activities of ISO/TC130 in the past decade, the modern construction of graphic systems on which the standards of ISO/TC130 are based on is explained with a figure ( Fig.1) and description.
Fig. 1 shows the typical graphic system constructed from an image capture stage, storage and transfer stage, gamut mapping and reproduction stage, and shows how the conversion of data files between adjacent stages is performed by using device profiles. The ISO/TC130 standards discussed in WG2 (Prepress data exchange) are focused on these data flows.The main issue of Chapter 2 focuses on the background and contents of four standardization items as follows;
1) Measurement and environmental conditions (WG2, WG3)
2) Prepress data exchange and system evaluation tools (WG2)
3) Prepress process control and related metrology (WG3)
4) Media and materials (WG4)
In the TC130 area, the important areas of activity are characterization targets. The detail of input targets (ISO12641), output targets (ISO 12642) and SCID (ISO 12640) as already standardized are also described in this Chapter.
Proper colorimetric measurement procedures for graphic arts applications are the subject of ISO 13655. This is one exceptional standard where we have to develop a fundamental measurement standard because the CIE allows two geometries, two observers, and a variety of illuminants. We also have standards for printing in color, how the process should be controlled, and what color you expect to have on different papers.
Printing test was implemented by ANSI (USA), FOGRA(Germany) and Japanes committeee respectively to be referred to specifications for graphic art printing. The test results had provided the standard characterization data that allow us to develop device profiles in color reproducing systems.
Developing standards around color monitors and soft proofing and viewing conditions are work items of ISO/TC130. The status of these standards is shown in this Chapter. In conclusion, most of what goes on in ISO is application-specific. It is not fundamental color measurement, imaging etc. What ISO/TC130 is concerned with is how to apply that fundamental work, done by others, in digitalized graphic arts industries.
The objective of these standards is to meet specific commercial needs as robustly as possible. That is the underlying thought that the committeee members involved in the development of ISO standards wanted to have.

A main characteristic of the DWT (Discrete Wavelet Transform) is to provide an intuitive and visual presentation of digital signals or image from the viewpoint of time-frequency or spatial space-scale relation, respectively.
In this study, four differnt types of spatial filters：D2/D4/D8/D16 proposed by Daubechies are used for the DWT and IDWT. The visual deterioration of reconstructed gray level images and compression effect caused by deleting part of the orthgonal transform coefficients are discussed in connection with the quantitative evaluation of the reconstructed images: RMSE.