• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2007.11a
• /
• pp.48-52
• /
• 2007

A lot of researches have been done in order to investigate the dynamic characteristics of the aerostatic porous bearing, most of them used analytical approaches and only a few used experimental approaches. However the experimental condition used in the previous experimental approaches was not realistic, where the porous bearing has been fixed and only the mass supported by the bearing was allowed to move vertically. The dynamic stiffness obtained by those experimental setups may be different with the real case where the mass and the bearing move together in horizontal direction. In this paper, the dynamic characteristics of the horizontally moving aerostatic circular porous air bearings are investigated by the experimental approach. The experimental apparatus was designed to realize its real operating condition used in most industrial applications. The experimental results were compared with the previous experimental ones.

• Wind and Structures
• /
• v.26 no.4
• /
• pp.231-251
• /
• 2018

The objective of the investigation is the analysis of wind-tunnel experimental errors, associated with the measurement of aeroelastic coefficients of bridge decks (Scanlan flutter derivatives). A two-degree-of-freedom experimental apparatus is used for the measurement of flutter derivatives. A section model of a closed-box bridge deck is considered in this investigation. Identification is based on free-vibration aeroelastic tests and the Iterative Least Squares method. Experimental error investigation is carried out by repeating the measurements and acquisitions thirty times for each wind tunnel speed and configuration of the model. This operational procedure is proposed for analyzing the experimental variability of flutter derivatives. Several statistical quantities are examined; these quantities include the standard deviation and the empirical probability density function of the flutter derivatives at each wind speed. Moreover, the critical flutter speed of the setup is evaluated according to standard flutter theory by accounting for experimental variability. Since the probability distribution of flutter derivatives and critical flutter speed does not seem to obey a standard theoretical model, polynomial chaos expansion is proposed and used to represent the experimental variability.

• The Korean Journal of Applied Statistics
• /
• v.24 no.5
• /
• pp.893-904
• /
• 2011

The lecture of the experimental designs consists of two main part-experimental designs and model analysis. Mostly, the progress of the visualization has been made on a model analysis. As the visualization of experimental designs, we can consider the visualization of Latin squares, supersaturated designs, and balanced incomplete block designs. We can propose the design plots as well as use the scatterplots and the scatterplot matrices for the visualization of experimental designs. Through the visualization of experimental designs, we can use the synergy effect in teaching the lecture of the experimental designs.

• Particle and aerosol research
• /
• v.5 no.1
• /
• pp.17-27
• /
• 2009

Particle deposition on a semiconductor wafer larger than 100 mm was studied experimentally and numerically. Particularly the electrostatic effect on particle deposition velocity was investigated. The experimental apparatus consisted of a particle generation system, a particle deposition chamber and a wafer surface scanner. Experimental data of particle deposition velocity were obtained for a semiconductor wafer of 200 mm diameter with the applied voltage of 5,000 V and PSL particles of the sizes between 83 and 495 nm. The experimental data of particle deposition velocity were compared with the present numerical results and the existing experimental data for a 100 mm wafer by Ye et al. (1991) and Opiolka et al. (1994). The present numerical method took into consideration the particle transport mechanisms of convection, Brownian diffusion, gravitational settling and electrostatic attraction in an Eulerian frame of reference. Based on the comparison of the present experimental and numerical results with the existing experimental results the present experimental method for a 200 mm semiconductor wafer was found to be able to present reasonable data.

• The Korean Journal of Community Living Science
• /
• v.18 no.4
• /
• pp.539-553
• /
• 2007

The present study examined the effects of parent-education administered during divorce procedure on the perception of parent-education programs. The subjects were 60 couples who were in divorce procedure at the Seoul Family Court and had children under 20 Subjects were divided into three groups of 20 couples each: a control group, and experimental group 1 and experimental group 2 that were homogeneous in demographical and legal backgrounds. Experimental group 1 was shown pamphlets and videos on the role of divorced parents, and experimental group 2 was shown pamphlets and videos on the role of divorced parents as well as given explanations about the contents of the pamphlets and videos. No treatment was applied to the control group. According to the results of the experiment, the two experimental groups showed improvement in their perception of the necessity for parent-education programs. Demand for the number of sessions and hours, and the effect was higher in experimental group 2 than in experimental group 1. With regard to the necessity of parent-education programs, experimental group 2 was positive particularly to mandatory injunction, the payment of education fees and expectation of helpfulness. All three groups expected that parent-education programs would be helpful.

• The Journal of Churna Manual Medicine for Spine and Nerves
• /
• v.9 no.2
• /
• pp.1-9
• /
• 2014

Objectives : Many studies are being done in the method of experimental chuna science in China. The aim of this review is to understand and study the methods of experimental chuna science, focusing on the effects of chuna on circulatory system. Methods : We reviewed "實驗推拿學" and Chinese journals were searched using China National Knowledge Infrastructure(CNKI). Korean journals were searched using 3 Korean web databases(OASIS, NDSL, RISS). Results : By experimental chuna science, effect of chuna on blood pressure, cardiovascular system, hemorheologic system, blood flow velocity, circulation and lymphatic system were proved. Conclusions : Experimental chuna science is necessary for improvement of chuna to a higher level. In Korea, not many experimental studies are being done, especially in chuna and it has very narrow target diseases. For this reason we need to learn and adapt the methods of experimental chuna science of China.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.25 no.2
• /
• pp.343-362
• /
• 1995

The purpose of this study was to investigate chronic radiation effects on the basal cell of the rat tongue epithelium according to different irradiation timing. Forty-two female rats were devided into 5 experimental groups according to different irradiation timing and were irradiated single dose of 396cGy by MK cell irradiator using Cs-137. Experimental rats were sacrificed at the 2nd week, 4th week and 6th week after birth. The specimens were examined with light microscope and transmission electron microscope. The following results were obtained. 1. The first changes after irraditation were vacuoles. The vacuoles were chiefly observed in the cytoplasm, perinuclei area, and nuclei. 2. The most severe degenerative changes in the basal cell layer were observed in all experimental groups. ; cellular disarrangement, vacuole formation, widening of intercellular space, enlarged mitochondria & rER, and chromatin clumping were seen. 3. The cellular degenerative changes were most severe at the 4th week after birth in all experimental group, and the basal cell hyperplasia was seen at the 6th week in the most of experimental groups 4. The experimental groups 3 and 4 show more severe and more prolonged cellular degeneration than experimental groups 1 and 2, which were irradiated in pregnancy, and experimental group 5, which was irradiated after tongue maturation.

• Fashion & Textile Research Journal
• /
• v.24 no.6
• /
• pp.766-774
• /
• 2022

In this study, the fit of commercial sports bras was analyzed according to various design variations, focusing on the shape of the shoulder strap, which is known to cause great discomfort in wearing sports bras. Experimental clothes were set to four commercially available sports bras with different shoulder strap shapes. The results showed that, in "size suitability," the overall satisfaction with experimental clothing B, of which the shoulder strap can be adjusted, was the highest, especially for "underbust circ. fit," "bust circ. Fit," and "shoulder strap length." In the "Shape suitability" and "Wearability" sections, experimental clothing B also showed the highest satisfaction and the shoulder strap adjustment device did not negatively affect wearing satisfaction. In the question on "side wings rolled up," experimental clothing A also received a relatively good score, which is due to its long front length. In the "Compression of the front center" section, the responses for experimental clothing A and B were "appropriate" and for C and D, they were "pressurized." In "motion suitability" as well, satisfaction with experimental clothing B was the highest, followed by experimental clothes A, C, and D. In the "body shape correction" section, clothing B elicited the highest satisfaction, followed by experimental clothes A, C, and D, in that order. Overall, it is recommended that shoulder straps be applied with adjustable straps for the comfort of the shoulder area while wearing sports bras.

• Korea Trade Review
• /
• v.46 no.4
• /
• pp.17-37
• /
• 2021

This study aims to examine the effects of experimental attitudes and perceived personal information protection on satisfaction and loyalty for Chinese consumers who use unmanned convenience stores. The important results of this study are as follows. First, consumers' perception of the experimental servicescape of unmanned convenience stores in China has an effect on the consumer's experimental attitude. Consumers' perception of experimental diversity in unmanned convenience stores in China has an effect on the consumer's experimental attitude. Second, consumers' perception of the information quality of unmanned convenience stores in China has an impact on the consumer's personal information protection. Consumers' perception of the service quality of unmanned convenience stores in China has an impact on consumer's personal information protection. Third, consumers' perception of personal information protection in unmanned convenience stores in China has an effect on the consumer's experimental attitude. Fourth, consumers' perception of personal information protection in unmanned convenience stores in China has an effect on consumer satisfaction with experiments. Consumers' perception of the experiment attitude of unmanned convenience stores in China has an effect on the consumer's satisfaction with the experiment.

• Journal of The Korean Association For Science Education
• /
• v.29 no.3
• /
• pp.348-358
• /
• 2009

The purpose of this study was to investigate brain activation pattern and functional connectivity network during experimental design on the biological phenomena. Twenty six right-handed healthy science teachers volunteered to be in the present study. To investigate participants' brain activities during the tasks, 3.0T fMRI system with the block experimental-design was used to measure BOLD signals of their brain and SPM2 software package was applied to analyze the acquired initial image data from the fMRI system. According to the analyzed data, superior, middle and inferior frontal gyrus, superior and inferior parietal lobule, fusiform gyrus, lingual gyrus, and bilateral cerebellum were significantly activated during participants' carrying-out experimental design. The network model was consisting of six nodes (ROIs) and its six connections. These results suggested the notion that the activation and connections of these regions mean that experimental design process couldn't succeed just a memory retrieval process. These results enable the scientific experimental design process to be examined from the cognitive neuroscience perspective, and may be used as a basis for developing a teaching-learning program for scientific experimental design such as brain-based science education curriculum.