The effect of parameters on the consequence of the flash fire accident by the release of heavy gas(in this study, xylene vapor) was analyzed. Simulation results showed that the distance with the lower flammable limit(XLFL) was increased with the increase of the release hole diameter. For the case of the elevated release, XLFL was increased with the increase of the wind speed and the release height, but XLFL was not affected by the wind speed for the release on the ground level. Therefore, the accident in the elevated release was more dangerous than the release on the ground level. In this condition, the release height had more effect on XLFL at the night time than the daytime and in the urban area than the rural area.

Ten years have passed since the establishment of KOSHBA(Korea Small and medium enterprises Hybrid Business Association), KOSHBA is composed of over 400 regional groups; over 4,000 enterprises are participating in the association. This paper deals with a survey on the present status of the participating companies in HBA of Kangwon province including the motivation of participation, participating period, and the purpose of participation. The survey results show that they are participating in HBA for manpower interchange, information gathering, mutual utilization of management resources, and their company's growth. To become a dynamic and vital association, it is necessary to share, learn, and discuss their managerial problems based on mutual trust and respect at the regular monthly meeting.

Attempts have been made to describe the influence of production process parameters on the microstructure and properties of W-Ag and Mo-Ag composites. The compositions of powder mixtures are W+30% Ag and Mo+30%Ag. Silver additions assists densification during sintering by a liquid phase sintering process. The main goal of this work is to compare properties and microstructure of as-sintered and as-infiltrated composites.

This study was carried out to compared the characteristics of the underweight university students with those of overweight university students. The surey was carried out by self-questionnaires with 97 underweight and 156 overweight university students. The results are summarized as fellows. Breakfast was skipped in 37.1% of underweight and 46.2% of overweight students and it appeared overweight students eat faster than underweight students. The 16.5% of underweight and 75.0% of overweight students have correct perception about their body image. The percentage of weight control experience were 25.8and 55.8 in the underweight and overweight students, respectively. Blood levels of lipid profiles(triglyceride, LDL cholesterol, and HDL cholesterol), hemoglobin, AST and ALT were anaylzed. Plasma levels of triglyceride, total cholesterol, LDL cholesterol, and HDL cholesterol of underweight students were 96.41, 143.75, 97.53 and 56.27 mg/dl, and those of overweight students were 107.99, 164.31, 100.08 and 53.64 mg/dl, respectively. Blood parameters were in normal range in both group. Plasma triglyceride, total cholesterol and LDL cholesterol levels o( overweight students were higher than those of underweight students. On the other hand, plasma HDL cholesterol levels of overweight students were lower than those of underweight students. Plasma levels of AST and ALT were in normal range in both group. However, AST and ALT levels of overweight students were higher than that of underweight students. Therefore they should have a nutritional education program to improve their dietary and living habits for overweight students' health. And nutritional education program should be organized practically and systematically

Powder grades pre-alloyed with 1.5-3 wt% chromium can be successfully sintered at the conventional temperature although well-monitored sintering atmospheres are required to avoid oxidation. Mechanical properties of the Cr-alloyed PM grades are enhanced by a higher sintering temperature in the range , due to positive effects from pore rounding, increased density and more effective oxide reduction. Astaloy CrM (Fe-3 wt% Cr-0.5 wt% Mo) with 0.6 wt% graphite added obtains an ultimate tensile strength of 1470 MPa and an impact strength of 31 J at density , after sintering at followed by cooling at and tempering.

Machining processes generate severe heat, which deforms thin metallic parts while they are being processed. The amount of deformation of a thin part is mainly dependent on heat and the shape of a component. The selection of machining parameters can decrease the temperature arisen during a machining process. This paper investigates selecting machining parameters to minimize the heat-deformation that is produced during machining. Taguchi method is applied to setup experiments. Three factors and three levels for each factor in the experimental design are selected. This research analyzes the effects of machining parameters to minimize the heat-deformation through examining the analysis of variance (ANOVA) and the signal to noise ratio (S/N).

A deep stellar analysis is introduced for the poorly studied open cluster NGC 2509. The Near-IR database of the digital Two Micron All Sky Survey (2MASS) has been used to re-estimate and refine the fundamental parameters of the cluster, i.e. age, reddening, distance, and diameter. As well as, luminosity function, mass function, total mass, relaxation time, and mass segregation of NGC 2509 have been estimated here for the first time.

Taguchi methodology has been applied to get an idea about the parameters related to the chemical vapour deposition technique, which influences the formation of semiconducting carbon thin film of a desired band gap. L9 orthogonal array was used for this purpose. The analysis based on Taguchi methodology suggests that amongst the parameters selected, the temperature of pyrolysis significantly controls the magnitude of band gap (46%). Sintering time has a small influence (30%) on the band gap formation and other factors have almost no influence on the band gap formation. Moreover this analysis suggests that lower temperature of pyrolysis (≤ 750℃) and lower time of sintering (≤ 1 h) should be preferred to get carbon thin film with the desired band gap of 1.2eV.

The authors have assembled a sample of 80 W UMa binary systems (42 W-subtype and 38 A-subtype) whose light curves have all been solved by means of the recent W-D code and combined with up-to-date radial velocity solutions. The absolute parameters (masses, radii and luminosities) have been derived (without any constraint on the physical parameters). The main results of this paper are: (1) the mass-luminosity relations for both W&A-subtypes. as well as for all W UMa contact binaries have been shown, (2) the mass-radius relations have been found for both subtypes, (3) some remarks on the evolution status have been presented.