Several previous simulation studies using various geochemical models have been carried out in several major analogue sites. The cases are beneficial when these studies provided the possibility of testing the geochemical models to be used to describe the migration of radionuclides in a future radioactive waste repository system. It was possible to interpret the complex transport behaviour of radionuclides such as uranium and thorium in an environment. We organize major natural analogue study sites from the previous literatures that provided information on the general geochemistry of the sites, in terms of groundwater composition and mineralogy. Also, we calculated aqueous speciation and the solid phases most likely to control their solubilities. The results obtained from the previous studies and this study vary depending on the tools used and on the conceptual models followed. Also, the results differed from the actual measured concentrations of trace metals or radionuclide analogues. The results obtained from these tests identify the main mathematical limitations of available geochemical models. However, the modelling results using a geochemical code with the thermodynamic database simulated well the observed behaviour of radionuclides, especially to identify the dominant processes controlling actinide mobilization and fixation. It was a useful outcome in terms of building confidence on the current geochemical tools to predict the concentrations of radionuclide analogues once the major geochemical characteristics were known. This study allows improving specific aspects of geochemical modelling using major natural analogue sites.

In previous studies, we found the production of antibodies against cross-reactive bovine serum albumin (BSA) in D-galactose (D-gal) induced aging mouse models. We performed immunoblot analysis with mouse tissue lysates to investigate the changes in the overall autoantibody production in this animal model. And we were able to see the possibility of altering the activity of mouse natural antibodies in this process. In this study, we examined changes in existing natural antibodies in a D-gal-induced aging mouse model. Serum samples were collected from 3-week-old mice (3w), 13-week-old mice (13w), and 13-week-old mice that were treated with D-gal for 6 weeks (13wDG), beginning at the age of 8 weeks. Levels of immunoglobulins (IgM, IgG, and IgA) were quantitatively analyzed in serum samples. Tissue samples were obtained from skin, spleen, and ovary for Western blotting analyses. Natural antibody activity was examined by enzyme-linked immunosorbent assay analyses of anti- double-stranded DNA (dsDNA) antibody. Western blotting analyses using mouse tissue lysates showed that several protein bands detected by serum antibodies from 3w mice became increasingly thicker when detection was performed with serum samples from 13w and 13wDG mice, indicating quantitative increases in levels of natural antibodies. Relative amounts of total IgG, IgM, and IgA immunoglobulins sequentially increased in serum samples from 3w, 13w, and 13wDG mice. A similar tendency was observed regarding the levels of IgM and IgG antibodies against dsDNA. These results indicate increased levels of natural antibodies in the D-gal-induced aging mouse model. Therefore, this animal model could be useful for future natural antibody research.

The purpose of this study was to identify the relationship between complexity, tacit knowledge, know-how, perception, and perception on business performance, and to suggest management implications for corporate performance and organizational executives. Therefore, the implications of this study are as follows. First, corporate representatives and staff in charge of organization should be able to access various information and contents through various routes about the work of members of the organization, and should make efforts to freely communicate among members. Second, corporate representatives and organizational practitioners should consider using the traditional methods of communication within their work, but allowing more informed and inmates to do more off-the-job activities that can increase intimacy with each other. Third, corporate representatives and organizational practitioners should provide a situation in which they can acquire work knowledge in a variety of ways, but must devise communication methods to increase information sharing and information value among members. Fourth, corporate representatives and organizational practitioners should endeavor to provide employees with educational support, family invitation events, awards and bonuses, and compliments that will make them more interested in their work. Lastly, corporate representatives and organizational practitioners are encouraged to maintain effective communication, employee pride, etc., so that the concentration of work, achievement, quality and productivity of work, and high professionalism can be maintained. You will have to work hard.

Three marine isopods, Symmius yamaguchiensis Shimomura, 2008, Colanthura pigmentata Kensley, 1980 and Synidotea nipponensis Nunomura, 1985 are reported for the first time in South Korea. The family Chaetiliidae, and genera Symmius and Colanthura are new to South Korea. We provide descriptions of the diagnostic characteristics, illustrations of three species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.

Two marine isopods, Pentias hayi Richardson, 1904 and P. thompsoni Collinge, 1916 were verified as unrecorded species in South Korea. The genus Pentias is reported for the first time in South Korea. These two isopods were collected from Heuksan-do Island and Ulleung-do Island from South Korea, respectively. We provide descriptions of the diagnostic characteristics, illustrations of two species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.

FePt binary-alloy nanopowder has been successfully synthesized by chemical vapor condensation process with two metal organic precursors, i.e., iron pentacarbonyl and platinum acetylacetonate. Average particle size of the powder was less than 50 nm with very narrow size distribution, revealing high dispersion capability. Characteristics of the powder could be controlled by changing process parameters such as reaction temperature, chamber pressure, as well as gas flow rate. Magnetic properties of the synthesized FePt nanopowder were investigated and analyzed in terms of the powder characteristics.

Thermoelectric thick film was fabricated by screen printing process with using p-type Bi-Te-Sb powders. The powder was synthesized by melting, milling and sintering process and hydrogen reduced to enhance the thermoelectric property. The thick film of Bi-Te-Sb powder was fabricated by screen printing method and baked at the optimized conditions. The thermal conductivity, the electrical resistivity and Seeback coefficient of thick film were measured and the thermoelectric performance was analyzed in terms of film characteristics and its microstructure. Finally, the feasibility of thermoelectric thick film into micro cooling device on CPU chip was discussed in this study.

The nano-sized Fe powders were prepared by plasma arc discharge process using pure Fe rod. The microstructure and the sintering behavior of the prepared nanopowders were evaluated. The prepared Fe nanopowders had nearly spherical shapes and consisted of metallic core and oxide shell structures. The higher volume shrinkage at low sintering temperature was observed due to the reduction of surface oxide. The nanopowders showed 6 times higher densification rate and more significant isotropic shrinkage behavior than those of micron sized Fe powders.

The effect of seasonal wind on the tidal circulation in Jeju harbor was examined by using a numerical shallow water model. A finite element for analyzing shallow water flow is presented. The Galerkin method is employed for spatial discretization. Two step explicit finite element scheme is used to discretize the time function, which has advantage in problems treating large numbers of elements and unsteady state. The numerical simulation is compared with three cases; Case 1 does not consider the effect of wind, Case 2 and Case 3 consider the effect of summer and winter seasonal wind, respectively. According to result considering effect of seasonal wind, velocity of current vector shows slightly stronger than that of case 1 in the flow field. It can be concluded that the present method is a useful and effective tool in tidal current analysis.