• Journal of the Korean GEO-environmental Society
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• v.17 no.3
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• pp.5-12
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• 2016

Stone column is the method that replace soft ground such as weak clay and loose sand with gravel or crushed stone which has relatively high stiffness and low compressive. Stone column increases bearing capacity of the soft ground, reduces settlement, produces ground improvement effect by consolidation drain, and is effective to prevent soil liquefaction in sandy ground during an earthquake. Stone column has been used in many civil works, and has recorded quite a lot of construction achievement internationally, but there is no standardized settlement calculation method yet. Therefore, in this study, the applicability of the existing theoretical equations were evaluated through comparison and analysis to predict a reasonable settlement of the Stone column. Consequently, Hook's law formula was verified to be the most close to numerical analysis.

• Journal of the Korean Orthopaedic Association
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• v.52 no.1
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• pp.83-91
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• 2017

Purpose: To investigate the clinical outcomes of distal hook augmentation using a pedicle screw in thoracolumbar fusion in elderly patients. Materials and Methods: This retrospective multicenter study recruited 20 patients aged 65 years or older, who underwent anterior support and long level posterior fusion in the thoracolumbar junction with a follow-up of one year. To assess the effect of distal hook augmentation, the patients were divided into two groups; the pedicle screw with hook group (PH group, n=10) and the pedicle screw alone group (PA group, n=10). Results: The average age was 72.4 years (65-83 years). The average fusion segment was 4.6 segments (3-6 segments). There were no significant differences in age, sex, causative diseases, bone mineral density of lumbar and proximal femur, number of patients with osteoporosis, and number of fused segments between the two groups (p≥0.05). At 1 year follow-up after surgery, parameters related with distal screw pullout were significantly worse in the PA group. No patients in the PH group had distal screw pullout. However, six patients (60%, 6/10) in the PA group had distal screw pullout. There were no significant differences in the progression of distal junctional kyphosis between the two groups. Conclusion: Distal hook augmentation is an effective procedure in protecting distal pedicle screws against the pullout when long level thoracolumbar fusion was performed in elderly patients aged 65 years or older.

• Korean Journal of Human Ecology
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• v.17 no.2
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• pp.235-245
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• 2008

The purpose of this study is to examine 4-5 year older's creative thinking and to investigate the interrelationship between young child's creative thinking and their mother's supportive child-rearing behavior. The subjects were 125 pairs of 4-5 year olders and their mothers in Seoul and Gyeonggi-do. The Multidimensional Stimulus Fluency Measure(Van Hook & Tegano, 2002) was revised and used to measure children's creative thinking. For determining mother's supportive child-rearing behavior, the Child Rearing Behavior Observation Scale (Renshaw & Gardner, 1990) was revised and used. The major results were as follows: first, there is no significant difference between boys and girls, and between the 4 year-olders and 5 year-olders in the "child's creative thinking". Second, when mothers properly keep encouraging children's creative behavior in the course of performing their task, it can significantly effect on the development of their creative thinking.

• Structural Engineering and Mechanics
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• v.29 no.4
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• pp.411-422
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• 2008

In the present study, free vibration analysis of thick annular plates is analyzed by discrete singular convolution method. The Mindlin plate theory is employed. The material is isotropic, homogeneous and obeys Hook's law. In this paper, discrete singular convolution method is used for discretization of equations of motion. Axisymmetric frequency values are presented illustrating the effect of radius ratio and thickness to radius ratio of the annular plate. The influence of boundary conditions on the frequency characteristics is also discussed. Comparing results with those in the literature validates the present analysis. It is shown that the obtained results are very accurate by this approach.

• Proceedings of the Korea Concrete Institute Conference
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• 2004.11a
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• pp.623-626
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• 2004

The purpose of this paper is to study the effect of longitudinal reinforcement for anchoring in the wide beam column joint as wall as the contribution of depth of spandrel beam to hysteretic behavior of the wide beam column joint. From the test it was shown that the specimen with anchorage in the joint had higher strength than the specimen with normal hook anchorage. Specimen with debonded reinforcement at out of Id from column face failed showing moved plastic hinge and less strength than normal specimen. However, the dissipated energy was increased $11\%$.

• Journal of the Korean Society of Safety
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• v.10 no.3
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• pp.47-55
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• 1995

We got operational safety limit angle being able to affect operators or materials surrounding the center of vertical line of the hoist on working from the theoretical review and experimental result. Then we inferred the distance to about 1.2m-1.4m from the center which materials hanged on the hook were able to effect to the surround. Therefore, we got about $7^{\circ}$ to the inclined or crossed operational safety limit angle of the crane with 6m lift. Also, we developed heisting rope automatic vertical controller which could control this kind of dangerous operation. And we did experiments again after establishing the inclined or crossed operational safety limit to $7^{\circ}$. The result is satisfied.

• Steel and Composite Structures
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• v.32 no.2
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• pp.253-264
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• 2019

This paper presents the combination resonances of FG porous (FGP) cylindrical shell under two-term excitation. The effect of structural damping on the system response is also considered. With regard to classical plate theory of shells, von-$K{\acute{a}}rm{\acute{a}}n$ equation and Hook law, the relations of stress-strain is derived for shell. According to the Galerkin method, the discretized motion equation is obtained. The combination resonances are obtained by using the method of multiple scales. Four types of FGP distributions consist of uniform porosity, non-symmetric porosity soft, non-symmetric porosity stiff and symmetric porosity distribution are considered. The influence of various porosity distributions, porosity coefficients of cylindrical shell and amplitude excitations on the combination resonances for FGP cylindrical shells is investigated.

• Journal of Physiology & Pathology in Korean Medicine
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• v.18 no.6
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• pp.1896-1903
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• 2004

Anglicae dahuricae Radix (ADR), the dried roots of Angelica Dahurica Benth et Hook (Umbelliferae), is a traditional herbal medicine used to treat colds, headache, skin diseases such as acne and possess analgesic, antipyretic and drainage effects. In the present study, the author evaluated the effect of ADR on regulation of inflammatory reaction. ADR reduced the ear-swelling responses derived from compound 48/80 in dose-dependent manner significantly. ADR inhibited the PMA plus A23187-induced productions of IL (Interleukin)-8, IL-1β, granulocyte macrophage-colony stimulating factor (GM-CSF) and tumor necrosis factor (TNF)-α from human mast cells (HMC)-1. In addition, ADR blocked PMA plus A23187-induced ERK1/2 phosphorylation. Ⅰ suggest that ADR regulates inflammatory reaction through inhibition of inflammatory cytokines such as IL-8, IL-1β and GM-CSF.

• Journal of Korean Physical Therapy Science
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• v.9 no.2
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• pp.133-141
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• 2002

This purpose of this study was to design the effect of recovering of a hand amputees by Myoelectronic hand. It was designed with 2 degree of freedom in the laboratory. Myoelectronic hand had only one degree of freedom and one movement until now. Also this myoelectronic hand had multi-joint and it could move widely. Wire was used in transmission. Myoelectronic hand data was obtained by analyzing hand anatomically and measuring and that data was applied when it was designed. PID controller of Myoelectronic hand was used to it. Displacement control was applied the first link. Experiment was accomplished in Tip grasp, Power grasp and Hook grasp modes. Displacement control was good in low frequency. Velocity control was applied to each mode. The objective of the study was to develop more better multifunction myoelectronic control strategies. A myoelectronic hand with a hand amputees could do some jobs such as grasping materials, lifting weighting, holding cup and etc. As a result of this study, all subjects with hand amputees significantly improved in ADL. Further studies were needed to evaluate the effect of a myoelectronic hand with more precise laboratory equipment.

• The Korean Journal of Ecology
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• v.5 no.4
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• pp.176-186
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• 1982

Uptake and effects of treated Cd and Pb in rose moss and tomato were studied in pot cultures. Three horticulural plants on the roadside were tested to determine the contents of heavy metals in plant parts. Yields of rose moss were increased by the increase Pb concentrations in soil. Yields of rose moss by Cd treatment were decreased in 1, 000 ppm group, but increased in 500 ppm group. Portulaca grandiflora Hook. proved to be tolerent of Pb and Cd added in soil. Yields of tomato were decreased by an incrase of Pb concentration in soil, and tomato proved to be weak for Pb added in soil. Pb contents in root, stem, leaf, and flower and seed of rose moss were increased by an in crease of Pb concentration in soil Pb content in root was the highest among them. Pb content was the highest in root of tomato, but the lowest in the stem. Among the heavy metal contents metal contents of three horticultural plants collected by roadside, it was the Chrysanthemum which had the highest contents of heavy metal among them. The heavy metal contents in stem were less than in the other plnat parts in all three plants. The number of flowers in rose moss was decreased by an increase of Pb, and Cd concentration in soil, but in tomato it was increased by an increase of Pb concentration in soil. Amount of rose moss seeds which were collected after cultivation was decreased by Pb, and Cd treatment in soil.