• Journal of the Korea institute for structural maintenance and inspection
• /
• v.25 no.6
• /
• pp.185-192
• /
• 2021

In this study, Full-scale hollow slab Mock-up with VPS(Void Plywood Slab System) was produced. Through Mock-up, the safety of the flat plate hollow slab against short-term sagging and long-term sagging is to be evaluated. The hollow rate of the mock-up specimen to which the hollow core slab was applied was designed to be 24%. When loading through concrete blocks, the most central part of the slab was deflection 8.88mm when loading. However, it shows a safe value compared to the reference value (l_n/240=17.93mm) for short-term deflection. As a result of 3 months of measurement of the mock-up experiment, the deflection at the center of the slab increased by 6.792mm from the initial deflection. In addition, it was found that the reference value by the load used suggested by KBC2016 was satisfied.

• The Journal of Pediatrics of Korean Medicine
• /
• v.14 no.2
• /
• pp.133-140
• /
• 2000

Purpose : Posterior Neck Pain and Back Pain are common diseases in human daily life. For reducting symptom and treatment of these diseases, many methods have been used and studied until now. The mechanisms of Ceragem Master Heat Bed(R)(Ceragem Co. Seoul, Korea) are infrared-heat therapy from natural nephrite and pressure therapy by up-down movement of natural nephrite ball. Through this study, authors would evaluate the clinical effectiveness of Ceragem Master Heat Bed(CMHB) on relieving posterior neck pain and back pain. Materials and methods : From 12-01-2000 to 01-13-2001, posterior neck pain and back pain patients were selected for experiment group(23patients) and control group(14patients). In both group, Visual Analog Scale(VAS) of pre-treatment stage is above 5 points. Experiment group were cared with acupuncture therapy, buhang therapy and CMHB. Control group were managed with only acupuncture therapy and buhang therapy. They were treated more than three times at least. At pre-treatment and post-treatment stage, we measured VAS for individual patients, and then compared effect of treatment in experiment group and in control group. Statistical analysis was preformed using SAS program. Results : In this study, a mean difference of VAS between pre-treatment and post-treatment stage was large in experiment(CMHB) group more than in control group(p〈0.01). Conclusion : Experiment(CMHB) group was more effective pain relief than control group in the treatment of posterior neck pain and back pain. CMHB was available for stimultaneous application of heat therapy and pressure massage together that gave another effects of mental stability and fatigue recovery. As the results of this study, CMHB could be used as a helpful treatment modality for posterior neck pain and back pain.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
• /
• v.17 no.11
• /
• pp.1050-1059
• /
• 2005

Heat and $SF_6$ gas dispersions over a complex terrain were investigated using wind tunnel. The wind speed, temperature and concentration profiles were measured for the 1/1000 scale complicated terrain model in an Eiffel type boundary layer wind tunnel with test section of 2.5m in height and 4.5m in width. The scale model was mounted on the top of a plate which can rotate with respect to the approaching wind. Dispersion processes from a continuous emission source driven by various wind direction were investigated, including plume climbing over the steep up-slope of the mountain and down-spreading toward the lower level of the valley. Extensive dispersion experiment data (wind speeds and concentration profiles) were provided for verification and validation of dispersion models. Under the identical flow and emission conditions, the independently measured profiles of the temperature and $SF_6$ concentration showed an excellent agreement which ensured the credibility of the results.

• Journal of the Korean Society of Combustion
• /
• v.13 no.2
• /
• pp.23-32
• /
• 2008

Gasification characteristics in the fluidized bed reactor are essential for the design of a gasification furnace to optimize the operation condition. Moisture content of the solid fuel is one of the important factors to influence directly the gasification characteristics. So it is necessary to investigate the effect of moisture content of solid fuel in partial oxidation condition. Gasification characteristics are investigated with results from thermogravimetric analyzer and lab-scale fluidized bed reactor for wood and RDF samples along with changing moisture contents. Additionally lab-scale fluidized bed reactor was run continuously and gas concentrations at the exit were measured. It is observed that the rate of reaction in partial oxidation condition is between the results from the combustion environment and from the inert condition. Moisture content in a particle slows down the heating rate of a particle. So, reaction is delayed by the moisture content. However, RDF samples those are easy to break-up don't show the effect of moisture content. The result of continuous operation condition shows that proper moisture content promotes gasification because steam from the particles helps gasification of the solid fuel. A simulation to predict the syn-gas composition was conducted by the Aspen Plus process simulator. The cold gas efficiency of the experiment was compared with results from the simulation.

• Journal of The Korean Society of Integrative Medicine
• /
• v.2 no.4
• /
• pp.59-68
• /
• 2014

Purpose : The purpose of this study was to evaluate the effects of aquatic exercise program on Gross motor function and lower limb control of children with spastic cerebral palsy. Method : The subjects of this study are children with spastic cerebral palsy; 2 patients who agreed with this research, were picked up. Subjects received aquatic exercise training for 6 weeks, which consists of 2 times per week, 30 min of working pattern with floating device for each session. Gross motor function and lower limb control for walking were measured GMFM and SCALE. The intervention were compared by measuring before and after. Result : In GMFM and SCALE of both subjects, the intervention has been improved after the experiment compared to their original status before the intervention. Conclusion : Therefore, the Aquatic exercise is effective in improvement of to improve the gross motor function and lower limb control in chidren with spastic cerebral palsy.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2010.09a
• /
• pp.979-990
• /
• 2010

Although a centrifuge model test is performed with scaled models, it has a lot of advantages compared with usual scale model tests, for the reproduction of stress levels equal to a full scale test is possible. At the beginning of the Daewoo Institute of Construction Technology, a servo-motor-driven single axis actuator was introduced and has been in use with a geo-centrifuge. However, for variety of experiments and construction stage simulation, various apparatuses have been developed, such as a vacuum generator, a lateral actuator for tidal power simulation, a gravel hopper and a sand drainer for filled-up ground, and a water level controller. The apparatuses have been manufactured with enough strength and durability to be operated under specific g levels. This paper presents the properties of the apparatuses and the results of the tests performed with those.

• Structural Engineering and Mechanics
• /
• v.53 no.3
• /
• pp.393-410
• /
• 2015

Two dimensional numerical models and physical models have been developed to study the highly nonlinear interactions between waves and breakwaters, but several of these models consider the effects of the structural dynamic responses and the shape of the breakwater axis on the wave pressures. In this study, a multi-material Arbitrary Lagrangian Eulerian (ALE) method is developed to simulate the nonlinear interactions between nonlinear waves and elastic seawalls on a coastal rubble mound breakwater, and is validated experimentally. In the experiment, a solitary wave is generated and used with a physical breakwater model. The wave impact is validated computationally using a breakwater - flume coupling model that replicates the physical model. The computational results, including those for the wave pressure and the water-on-deck, are in good agreement with the experimental results. A local breakwater model is used to discuss the effects of the structural dynamic response and different design parameters of the breakwater on wave loads, together with pressure distribution up the seawall. A large-scale breakwater model is used to numerically study the large-scale wave impact problem and the horizontal distribution of the wave pressures on the seawalls.

• Journal of the Korean Society of Physical Medicine
• /
• v.7 no.2
• /
• pp.213-221
• /
• 2012

Purpose : The purpose of this study was to investigate the effect of Vojta therapy on Gross Motor Function Measurement(GMFM) and Selective Voluntary Motor Control (SVMC) in children with Spastic diplegia. Methods : During this experiment, the subject of four children diagnosed with spastic diplegia was tested using ABA design for Single-subject Experimental Research Design. The procedure consisted of baseline, intervention and follow-up phase which was held thirty minutes each for three times a week for a total of 24 times. Gross motor function was measured using GMFM and selective voluntary motor control was measured using SCALE. Results : According to this study, the gross motor function and selective voluntary motor control of all subjects were improved from their intervention phase to their baseline phase. During the follow phase which the intervention was removed, the ability that was enhanced during the prior phases was still either maintained or only reduced slightly. Conclusion : The Vojta therapy used on children diagnosed with spastic diplegia was effective on both GMFM and SVMC. In other words, the therapy was effective on coordination. However, this study is difficult to be generalized due to the insufficient number of subject. In further studies, it will be necessary to increase the number of trials with a control group in order to generalize the effectiveness of Vojta therapy.

• The Journal of Korean Physical Therapy
• /
• v.26 no.2
• /
• pp.104-109
• /
• 2014

Purpose: The purpose of this study was to understand the effect of aquatic exercise on balance and depression of stroke patients. Methods: For 12 participants with stroke, six members of the experimental group and six members of the control group were randomly selected and arranged. Proprioceptive Neuromuscular Facilitation (PNF) lower extremity aquatic pattern exercise was applied to the experimental group. On the other hand, participants in the control group performed PNF lower extremity pattern exercise on the ground. Both exercises were performed 30 minutes per day, five times per week, for a period of six weeks. Balance was assessed using the Berg Balance Scale (BBS) and Timed Up to Go test (TUG). Depression was measured using the Center for Epidemiologic Studies depression scale (CES-D). Results: As a result of comparison within groups, the experimental group showed significant difference for balance and depression after the experiment (p<0.05). In comparison between the two groups, the experimental group in which aquatic exercise was applied showed more significant change in balance and depression than the control group (p<0.05). Conclusion: According to the results of this study, aquatic exercise was proven to enhance the balance and decrease the depression of stroke patients.

• Korean Institute of Interior Design Journal
• /
• v.22 no.5
• /
• pp.162-170
• /
• 2013

Although vision has been considered as a top sensory organ in the Western culture until modern times, the significance of space experience that communicates with a body via complex perceptions has recently garnered attention. This study criticizes the limitations of a vision-centered space and has the goal of empirically examining the sensibility characteristics in a haptic space through post-structuralism views leading up to Gilles Deleuze's philosophical ideas. This study will explore the flow of senses from the philosophical and artistic standpoint and the sensibility characteristics in a haptic space by examining the theories on haptic perceptions in connection with a space. In order to test the existing theories and identify the differences in sensibilities depending on perceptual method, the sensibilities of participants were compared using SD method (Semantic Differential scale method) and a validity test was conducted using a statistical program SPSS. The research has revealed that the average sensitivity scale of complex haptic perception was higher than single perception that only relies on vision. In addition, there was a correlation between perceptual method based on various sensory organs and human sensitivities. This study is meaningful in that it can serve a foundation for empirical research on sensibility, since it has reexamined the relationship between space and participants and demonstrated and analyzed their sensitivities through an experiment.