In this study, the ZnS composite powders for host material in phosphor was synthesized in situ by mechanical alloying. As the mechanical alloying time increases, particle size of ZnS decreases. ZnS powders of in a mean size was fabricated by mechanical alloying for 10h. The crystal structures of ZnS powders were investigated by X-ray diffraction and the photo-luminescence properties was evaluated with the optical spectra analyzer. The steady state condition of mechanically alloyed ZnS was obtained as a mean particle size of in 5h milling. The sphalerite and wurtize structures coexist in the ZnS mechanically alloyed for 5h. The ZnS powder mechanically alloyed for 10h grows to the sphalerite structure. And the strong emission peaks of ZnS are observed at 480 nm wave length at the powders of mechanically alloyed for 10h, but the sphalerite and wurtize structures in ZnS coexist and emission peaks are not appeared at the powders of mechanically alloyed for 10h.

This paper deals with the fabrication of titanium carbide using fine titanium hydride. The ratio of and C (Activated carbon) was 1:1 (mol) and milled in a planetary ball mill at a ball-to-powder weight ratio of 20:1. Thereafter, TGA was performed at to observe change of weight with milling time. Titanium carbide was obtained by using tempering the milled powders at . The microstructures of titanium carbide as well as the change of the lattice parameters and particle size have been studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Compared to the influences of Korean art journalism, the researches on them are rarely conducted. This study aims to examine the influence of art journalism in art magazines in Korea. Although it is essential to consider media, journalism, public opinion altogether, I focused only on the media due to the absence of previous studies. I have analyzed the current conditions of korean art journalism, types of feature articles, sponsors, their relations with articles, and the comparison with foreign art journalism in terms of production conditions. There have been about one hundred art magazines published in previous sixty years and currently there are twenty three. Monthly periodicals are the majority; the publishers are sorted out as publishing houses, galleries, newspaper company in order; specialized art magazines developed from the eighties. Through an examination of feature articles in these art magazines, I found that they repeated similar art issues and covered the same artists, sponsors and articles. Moreover, when the magazines went through the conflicts between managers and editors, the ascendency of managers obstructed the development of art journalism regarding journal quality. These days, art journalism have been comparatively regressed compared to other art systems such as art museums, curatorship, international art festivals, distributions and art promotion policies. The main causes for failure were the lack of professional management, the limited effort to diversify sponsors, and the repetition of the same informants and events without making an effort to be specialized. Magazines are published media which contribute to the creation of culture, distribution, and preservation. Therefore art magazines can be said the most influential media in forming art culture and distributing it. It is quite necessary to reform the problems of repeating of information and the lack of speciality in conjunction with the commitment of management and editorialship.

The application concept of using a fail safety filter on the filtering system is to prevent the particle leakage when the main filter element is broken at high temperature. In this study, the metal filters were fabricated by pressureless sintering method. The mixture of stainless steel powders and filler metal binder solved in the water solutions of 5% PVA was compacted to form the cylindrical filter without pressure. The compacted filter were sintered in the vacuum sintering furnace at 120 for 1 hour. The metal filter(produced with powder of 640-840 size) having more than above 50% porosity, 500 pore size, and permeability of 7.310m plugged within 2.5 minute to prevent the leakage of maximum slip particle size of less than 3.

In the present study, imbedded composite powders have been successfully prepared from the (Cu. Zn)/ composite salt solution. The composite (Cu, Zn)/ powders were formed by drying the solution at 200~ in the hydrogen atmosphere. Photocatalytic characteristics was evaluated by detecting the decomposition ratio of aniline blue with UV-visible spectrophotometer(Shimazu Co., UV-1601). Phase analysis of (Cu, Zn)/ composite powders was carried out by XRD and DSC, and powder size was measured with TEM. The mean particle size of composite powders was about 100mm. As the reduction temperature increases, a few zinc sulfide and oxide phases was formed and copper oxide phase was reduced. The decomposition ratio of aniline blue was about 80％ under the UV irradiation by the TiO phase in the composite (Cu, Zn)/ powders and similar decomposition ratio of 80％ was obtained at the UV lightless condition by virtue of Cu and Zn compounds.

In the present study, imbedded copper matrix powders have been successfully prepared from the () composite salt solution. The composite powders were formed by drying the solution at 200~40 in the hydrogen atmosphere. Photocatalytic characteristics was evaluated by detecting TOC (total organic carbon) amount with TOC analyzer (model 5000A Shimadzu Co). Phase analysis of composite powders was carried out by XRD, DSC and powder size was measured with TEM. The mean particle size of composite powders was about 100 nm and a few zinc and copper oxide phases was included. The reduction ratio of TOC amount was 60% by the composite powders under the UV irradiation for 8 hours