• Title, Summary, Keyword: Capability Reinforcement

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An experimental study for shear loading capacity of segmental members depending on various types of shear connector (전단연결부 형상에 따른 분절부재의 전단내하력에 대한 실험적 연구)

  • Han, Man-Yup;Kang, Tae-Heon;Shin, Jae-Woo;Jin, Kyung-Suk;Kang, Sang-Hun
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.158-161
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    • 2006
  • The numerical analysis and the experiment was performed to investigate the influences of shear connector on shear resistance capability. The numerical analysis's results should that the H/B ratio of shear key is more effective than angle of shear key against shear strength and shear behavior, and it is more desirable to use a half of the H/B ratio of shear key. The specimen was made with same condition as AASHTO recommended. There model tests were performed under various form of shear key, number, arrangement reinforcement and condition using epoxy. As a result of the experiment, there is little difference(or there is no difference) between the case of using epoxy on shear connector and the unused case.

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The Present State of Training System for Mental Health Professionals (우리나라 정신보건전문요원 수련제도 현황 및 개선방향)

  • Chae, Eun-Hee;Lee, Hyo Young
    • The Korean Journal of Health Service Management
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    • v.8 no.1
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    • pp.175-189
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    • 2014
  • The purpose of this study is to identify the present state of training system for mental health professionals. There are some topics which must be improved in the training system, like as reinforcement of qualification of the trainers, introduction of assessment system of the training, and other the quality improvement measures for the training system. Finally, the speciality and capability of mental health professionals will be promoted by supplements of the problematic matters and these efforts will be directly helpful to the people who has mental illnesses.

Numerical Simulations of the Normal Perforation Behavior by Penetrator without AOA into Steel Reinforced Concrete Targets (철근강화콘크리트에 대한 받음각이 없는 관통자의 수직관통거동 전산해석)

  • Yun, Kyung Jae;Yoo, Yoo-Han;Kim, Hak Jun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.3
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    • pp.398-404
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    • 2013
  • The simulation of the ballistic trajectory of penetrator into the spaced multi-layer RC targets is very important to predict the hitting condition in subsequent target. Because of perturbation by lateral load of penetrator caused by asymmetric hitting position between penetrator and steel bar reinforcement, penetrator rotates and deviates from the straight path. Therefore, penetration capability of penetrator is decreased in the subsequent targets. This paper presents the result of the penetration of steel-bar-reinforced concrete target by using the explicit finite element code LS-DYNA. A series of computations is performed and compared to experimental data and the computed results are in good agreement with the experimental results over a wide range of velocities. And then we conduct the simulation according to various RC target hitting condition and impact velocities.

Restoration of Tactility of Architectural Glass: Perceptual & Sensible Tactility - Focused on the Analysis of Laminata Glass House -

  • Kim, Sung-Wook;Kim, Do-Sik
    • Architectural research
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    • v.12 no.2
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    • pp.23-30
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    • 2010
  • The study of the expression of architectural glass has recently expanded due to various factors such as the development of architectural technology, the reinforcement of environmental standards, an increased interest in energy saving, and the commercialism of the exterior of buildings. The background for restoring the tactile capability of the sense of sight has been prepared by agitating oculocentricism pertaining to the Renaissance era. The restoration of tactility can be considered in two ways. One is the tactility 'perceived' through complex experiences and the other is the tactility 'sensed' from the challenges on the materiality of the glass itself. Perceptual tactility is achieved from compound visual experiences and connecting these complex experiences in the brain. Sensible tactility, in contrast to perceptual tactility, is a more direct tactility which works within the nervous system, bypassing the brain. This is attained by reversion of the materiality, tectonics and connection method of the glass. Among rare examples, Laminata House built in Leerdam, Netherlands is a fine example of direct and sensible tactility. In this paper, the process of restoring tactility in architecture is studied at each stage based on the restoration of tactility in painterly aesthetics.

Predicting shear strength of SFRC slender beams without stirrups using an ANN model

  • Keskin, Riza S.O.
    • Structural Engineering and Mechanics
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    • v.61 no.5
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    • pp.605-615
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    • 2017
  • Shear failure of reinforced concrete (RC) beams is a major concern for structural engineers. It has been shown through various studies that the shear strength and ductility of RC beams can be improved by adding steel fibers to the concrete. An accurate model predicting the shear strength of steel fiber reinforced concrete (SFRC) beams will help SFRC to become widely used. An artificial neural network (ANN) model consisting of an input layer, a hidden layer of six neurons and an output layer was developed to predict the shear strength of SFRC slender beams without stirrups, where the input parameters are concrete compressive strength, tensile reinforcement ratio, shear span-to-depth ratio, effective depth, volume fraction of fibers, aspect ratio of fibers and fiber bond factor, and the output is an estimate of shear strength. It is shown that the model is superior to fourteen equations proposed by various researchers in predicting the shear strength of SFRC beams considered in this study and it is verified through a parametric study that the model has a good generalization capability.

Evaluation of Spraying Characteristics for Masonry Buildings Seismic Retrofit Fiber-Reinforced Mortar (조적조 내진보강용 섬유보강 모르타르의 분사특성 평가)

  • Hwang, Byoung-Il;Park, Jong-Pil;Yoo, Byung-Hyun;Lee, Dong-gyu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.11
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    • pp.37-43
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    • 2020
  • The seismic reinforcement ratio of SOC facilities, such as domestic roads and railroads, is 96%. Out of approximately 7 million buildings as of 2016, only 0.51 million buildings with seismic performance were secured. Although the proportion of masonry structures is 38.8% of the total buildings, there is almost no seismic resistance, only 2.0%. To solve the problem in Korea, government-level seismic measures are being promoted, but the situation is insufficient. Overseas, the UBC research team in Vancouver, Canada, has developed and used EDCC to reinforce the seismic performance of masonry buildings. EDCC is a construction material that can secure concrete ductility capability by mixing fibers and secure deformation resistance of concrete through bridging action. It is necessary to examine various materials because EDCC is not used as a spray type of secure seismic reinforcement. In this study, as part of the research and development of spraying materials to improve the durability of masonry buildings, this study examined the spraying characteristics of fiber-reinforced mortar according to fiber use and the viscosity change according to the use of thickener. As a result, the working performance of the fiber-reinforced mortar for seismic reinforcement was improved when using 1% fiber and 1% thickener.

Diagnosis by Rough Set and Information Theory in Reinforcing the Competencies of the Collegiate (러프집합과 정보이론을 이용한 대학생역량강화 진단)

  • Park, In-Kyoo
    • Journal of Digital Convergence
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    • v.12 no.8
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    • pp.257-264
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    • 2014
  • This paper presents the core competencies diagnosis system which targeted our collegiate students in an attempt to induce the core competencies for reinforcing the learning and employment capabilities. Because these days data give rise to a high level of redundancy and dimensionality with time complexity, they are more likely to have spurious relationships, and even the weakest relationships will be highly significant by any statistical test. So as to address the measurement of uncertainties from the classification of categorical data and the implementation of its analytic system, an uncertainty measure of rough entropy and information entropy is defined so that similar behaviors analysis is carried out and the clustering ability is demonstrated in the comparison with the statistical approach. Because the acquired and necessary competencies of the collegiate is deduced by way of the results of the diagnosis, i.e. common core competencies and major core competencies, they facilitate not only the collegiate life and the employment capability reinforcement but also the revitalization of employment and the adjustment to college life.

Behavior of Rapidly Expansion Materials for Maintenance Railroad Bed Subjected to Cyclic Loading (반복하중을 받는 철도노반 보수용 급속 팽창재료의 거동)

  • Lee, Jundae;Shin, Eunchul
    • Journal of the Korean GEO-environmental Society
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    • v.10 no.2
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    • pp.45-50
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    • 2009
  • The differential settlement may be generated by the variation of stresses caused by the soft ground or ground water. The cracks are usually created when the structures are leaned or deformed due to the differential settlement. A grouting method has been mainly used till now to improve the bearing capacity of the ground when the foundation of the structure is deformed by differential settlements. However, when this method is used, it takes too long time to obtain the required strength and the period of the reinforcement effect is not long enough. The advantage of GPCON injection method is to have good mechanical properties and durability, and easy construction. In addition, the GPCON method rapidly fills up the void in soils by injecting some materials into underground and also obtain the increase of bearing and shearing forces due to the expansion. In this paper the restoration capability of the foundation settlement of railway and subway subjected to cyclic loading is analytically and experimentally evaluated using the high density rapidly expansion GPCON in order to investigate the types of deformations and vibrational characteristics.

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Experimental Evaluation of New Seismic Connections between Rectangular Steel Tube Column and H-shaped Beam (각형강관 기둥-H형강 보 신형상 내진접합부의 실험적 평가)

  • Jin, Jooho;Kim, DooHwan;Kim, Hyunsook;Shin, Jinwon;Park, Kooyun;Lee, Kyungkoo
    • Journal of Korean Society of Steel Construction
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    • v.30 no.2
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    • pp.77-85
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    • 2018
  • A through diaphragm is often used to ensure their stiffness for moment-resisting connections using rectangular steel-tube column and H-shaped beam. The through-diaphragm connections, however, have some difficulties for their applicabilities to the field due to the complexity of the fabrication and construction processes. This study thus proposes a new modular system of steel structures assembled only using bolts without welding, by bringing a connection module composed of rectangular steel-tube column, H-shaped beam and oneway bolt onto the site. An experimental study to evaluate the seismic performance of the proposed connection details based on the new modular system is then conducted. The length and type of the inner reinforcement plate are considered as the primary design parameters, and the strength, stiffness, ductility and energy dissipation capability of the new connections are experimentally analyzed by comparison to those of conventional through diaphragm connections.

The Study on the Market Competitiveness Reinforcement for Convergence Industry (융합산업의 시장 경쟁력 강화에 관한 연구)

  • Park, Eun-Young;Kwag, Dong-Gi
    • Journal of the Korea Convergence Society
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    • v.6 no.5
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    • pp.99-106
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    • 2015
  • The purpose of this research is to bring supportive ways to reinforce the market competitiveness of fusion industry based on the rapidly arising fusion industries considering system improvement and fusion R&D support. The research has proceeded in the order of setup for competitiveness reinforcing way of fusion industry and deduction for competitiveness reinforcing way based on directivity. It classified the fusion industry into introduction, diffusion and development by time, and suggested expert fusion R&D, open type fusion R&D, customized fusion R&D, system improvement of market entrance and supportive way for public purchase as the supportive way. It's purpose is to lead the entrance into the new fusion market, stabilize to settle into the market and create high value products by resolving difficulties for the market entrance of the new fusion products & service, reinforcing the fusion capability and securing the competitive advantage.