• Journal of the Korea institute for structural maintenance and inspection
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• v.25 no.2
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• pp.8-15
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• 2021

This study presents post-installed anchors whose heads and extension sleeves are improved. The optimal lengths of the extension sleeves and headers were analytically determined by simulations. As a result of analysis using Finite element method (FEM), 9.0mm and 3.0mm were determined as the optimal lengths of sleeves and headers respectively. In pull-out tests using the improved post-installed anchors, all specimens satisfied the coefficient of variation of 15%. Comparing the pull-out strengths of existing anchors and the improved anchors, it was increased by 1.25 times for anchors embedded with a depth of 50mm, and 1.54 times for 70mm. In the cases of high-strength concrete, the strengths were increased by 1.28 and 1.55 times for 50mm and 70mm respectively. Moreover, as a result of shear tests, the improved anchors perform the greater strength of 1.38 times than the existing anchors.

• Journal of the Korean Society of Clothing and Textiles
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• v.39 no.6
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• pp.852-866
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• 2015

This study analyzes the form of sleeve heads, which is an important internal element that affects the appearance of jacket sleeves. It characterized sleeve head forms by investigating angles, materials, and a combination of formations for 50 sleeve heads. It conducted an appearance evaluation by comparing and analyzing the results. This paper develops a sleeve head appropriately for sleeve construction. The study results are as follows. First, the product was divided into three parts: based on, force receiving, and sleeve cap parts. There were four types of man's sleeve head: straight, arc, and curve A and B types. The woman's sleeve head had two types: straight and curve B type. Second, the feature of each type of sleeve head was analyzed. A straight type emphasized the based on part. An arc type highlighted the force receiving part while the based on part decreased. The sleeve cap part, force receiving part, and based on part were emphasized in the arc type sleeve head. Third, as a result of the appearance evaluation, each type was rank as straight type < arc type ${\leq}$ curve A < curve B. The straight type did not get positive results as it had extra ease when the sleeve head was attached to a Jacket Sleeve. The arc type was evaluated poorly due to an inappropriate sleeve cap composition. The curve type received an excellent overall outcome as it fit into the sleeve cap part well and highlighted the force receiving part in order to minimize front and back wrinkles. Therefore, the curve type made the resemblance of the jacket appearance perfect and closest to the sleeve pattern.

• Journal of the Korean Society of Clothing and Textiles
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• v.40 no.2
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• pp.365-381
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• 2016

This study compared and analyzed current sleeve head products for men and women to develop sleeve head products for aesthetically-designed sleeves. Men and women's sleeve head products, suitable for sleeve caps, were designed and developed based on the results. The study results are as follows. First, men and women's sleeve heads for aesthetic jacket sleeves were designed with sleeve patterns in the background. Sleeve heads and upper sleeves were additionally designed to make 7-layers for men and 4-layers for women. Second, sleeve head patterns were designed so that men's would have a whole length of 48cm, an angle of $30^{\circ}$ and a width of 4.5-7.5cm; in addition, women's would be 40cm, $30^{\circ}$ and 4-5cm. Third, the same materials were used for men's and women's sleeve head products, and the background was made from 1-layer of soft non-woven fabric. As for the sleeve heads, 2-layers and 1-layer of non-fusible interlinings were used for men's and women's, respectively. In order to provide flexibility, the materials were designed in a bias direction. For upper sleeves, 1-layer of non-woven fabric and felt were used for men's, and 1-layer of felt for women's so that an empty space caused by easing contraction can be supplemented.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.13 no.1
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• pp.76-80
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• 2004

Cushion sleeves are used in pneumatic cylinders to avoid impact force arising at the end stroke part between moving piston and cylinder cover. In this study low kinds of cushion sleeves are designed, manufactured and attached to the pneumatic cylinder to be experimented. The effects of cushion sleeves on cushion characteristics are investigated. e results are as follows; the pressure variation of cushion room with orifices are inspected to be smaller than that of cushion room without orifices. So sleeves with orifices are expected as protecting from impact and vibration of pneumatic cylinder. The object of this study is to provide data on the charactristics of pneumatic cushion sleeve in case of being used in industry.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.10a
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• pp.71-72
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• 2016

Most of studies on PC method aim at the structural analysis and development of PC members, and studies on the construction management aspect are insufficient. Therefore, this study tries to investigate 'hallow PC column composite method(HPC composite method)' from the viewpoint of construction management and analyze the construction cost of the composite method. On the assumption that each comparative method was applied to the zone, the difference in construction cost between the two methods was analyzed. As a result, HPC composite method increased the initial investment cost because of its factor technology, but reduced transport cost, lifting cost, and installation cost through lightweight columns. This study analyzed only the difference in construction cost of HPC composite method so that it has the limitation in evaluating its economy. Therefore, to evaluate the economy of HPC composite method, it is considered to research more the construction cost of HPC composite method.

• Journal of the Korea Institute of Building Construction
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• v.16 no.5
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• pp.429-436
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• 2016

Because of the shortage of construction workers due to The rising labor costs and an aging labor force, construction time has been extended. As a solution, The construction time of high-rise buildings can be reduced by adopting precast concrete construction methods. Most relevant studies have focused on the development and structural analysis of such methods and not on their construction management. Therefore, this study focused on the construction management of the hollow precast concrete column (HPC) method. The objective of this study was to evaluate the performance of HPC formulations through the analytic hierarchy process and benefit-cost analysis. After a gap analysis of the available literature and expert interviews, the evaluation criteria were selected. A questionnaire survey was administered to professionals with ample experience in precast concrete construction for the pair-wise evaluation of the benefit and costs of the HPC method. The results show that the benefits of the HPC method outweighed its costs. Therefore, the HPC method is a suitable substitute for the half-slab method.