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As cold-formed steel is thin, the shape of a failure in the connection is a most important factor that influence on the ultimate strength of the joint. Most effective connection method of cold-formed steel is a bolting. Failure shapes of a bolted connection are longitudinal shear failure, bearing failure, shear failure of bolt, tensile failure of sheet and so on. In this study, we carried out many experiments with various variables which would be impacted on the ultimate strength of longitudinal shear failure, bearing failure of a bolted joint. Those experiments are conducted with the AISI(1989) criteria. We compared the results of our experiments with AISI criteria, and verified it. The result of this study would be expected as basic data for the design of the bolt joint in the cold-farmed steel structure.
The traditional heating system of our country is mainly "Ondol"-one of the radiant heating system with piping embedded in floors or slabs. "Ondol" have a number of unique characteristics. Such systems rely upon radiant heat transfer from the slab surface as well as convection. Consequently, comfort can be achieved with lower air temperatures than for convective heating systems. We have been much studying about the "Ondol", but have not yet set the sufficient design criteria for "Ondol" structures. Thus, the transient simulations of building performance are developed with which to investigate the dynamic performance of slab-heated building from the energy viewpoint and to suggest optimum design for slab heating systems. Futhermore, the paper presents some details of the thermal response of slab-heated buildings to varying loads and patterns of heat input. The effects of varying design parameters, such as depth of the heating elements, slab thickness are considered. I'll compare the numerical simulation with the results of experimentation to testify the feasibility of numerical analysis. Also, a discussion of the feasibility of slab heating and a comparison to conventional heating systems are given.
This study examines the infl uence of stress relieving clinical art therapy on the changes in the brain function index of alcohol dependent women. Clinical art therapy was carried out on alcohol dependent women who applied for clinical art therapy (ten in the experimental group, ten in the control group) once a week, 60 minutes each session for a total of ten sessions. The measurement tools used include the self-worth test, social psychological stress test and the brain function test. SPSS V 15.0 was used to carry out paired t-tests and repeated measure ANOVA for analysis. Research results are as follows. First, the self-worth of alcohol dependent women increased signifi cantly before (t=-4.016, p=.003) and after (t=-3.030, p=.014) clinical art therapy. Second, social psychological stress test results show that such stress decreased signifi cantly for both the experimental group and control group. Third, paired t-test results on the self control index before and after clinical art therapy, by group, show that there was a signifi cant difference (F=8.450, p=.009). Fourth, paired t-test results on the antistress levels before and after clinical art therapy, by group, show that stress was signifi cantly enhanced (t=-5.351, p=.015) from before (61.50±5.07) and after (75.59±7.80) therapy. Fifth, repeated measure ANOVA results for the brain index show that the test timing and group interaction effects had a signifi cant difference (F=16.939, p=.001), thus showing that clinical art therapy has a positive effect on enhancing the brain index. With this, the study proved that art therapy was effective in lowering stress in alcohol dependent women as the sessions progressed.