• Title, Summary, Keyword: Capability Reinforcement

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Nonlinear 3-D behavior of shear-wall dominant RC building structures

  • Balkaya, Can;Schnobrich, W.C.
    • Structural Engineering and Mechanics
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    • v.1 no.1
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    • pp.1-16
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    • 1993
  • The behavior of shear-wall dominant, low-rise, multistory reinforced concrete building structures is investigated. Because there are no beams or columns and the slab and wall thicknesses are approximately equal, available codes give little information relative to design for gravity and lateral loads. Items which effect the analysis of shear-wall dominant building structures, i.e., material nonlinearity including rotating crack capability, 3-D behavior, slab-wall interaction, floor flexibilities, stress concentrations around openings, the location and the amount of main discrete reinforcement are investigated. For this purpose 2 and 5 story building structures are modelled. To see the importance of 3-D modelling, the same structures are modelled by both 2-D and 3-D models. Loads are applied first the vertical then lateral loads which are static equivalent earthquake loads. The 3-D models of the structures are loaded in both in the longitudinal and transverse directions. A nonlinear isoparametric plate element with arbitrarily places edge nodes is adapted in order to consider the amount and location of the main reinforcement. Finally the importance of 3-D effects including the T-C coupling between walls are indicated.

A Study on Reinforcement Planning of Transmission Lines for Composite Power System (복합계통의 송전설비 보강계획에 관한 연구)

  • 차준민
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.15 no.3
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    • pp.45-50
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    • 2001
  • Fuzzy theory is used to quantify some subjective criteria and consider uncertain factors for transmission line reinforcement planning in this paper. Sugeno's fuzzy integral is also used in the proposed method, because it can be easily allied to multi attribute decision making problems such as power system planning. To verify the proposed algorithm, some bode-neck lines are searched for the case that the amount of Maximal Load Supplying Capability(MLSC) is small using the results of contingency analysis for Korea Electric Power Corporation(KEPCO)'s 345[kV] transmission line in 1998. And several feasible alternatives are composed for line reinforcement which can dissolve the bottle-neck.

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Force-deformation behaviour modelling of cracked reinforced concrete by EXCEL spreadsheets

  • Lam, Nelson;Wilson, John;Lumantarna, Elisa
    • Computers and Concrete
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    • v.8 no.1
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    • pp.43-57
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    • 2011
  • Force-deformation modelling of cracked reinforced concrete is essential for a displacement-based seismic assessment of structures and can be achieved by fibre-element analysis of the cross-section of the major lateral resisting elements. The non-linear moment curvature relationship obtained from fibre-element analysis takes into account the significant effects of axial pre-compression and contributions by the longitudinal reinforcement. Whilst some specialised analysis packages possess the capability of incorporating fibre-elements into the modelling (e.g., RESPONSE 2000), implementation of the analysis on EXCEL is illustrated in this paper. The outcome of the analysis is the moment-curvature relationship of the wall cross-section, curvature at yield and at damage control limit states specified by the user. Few software platforms can compete with EXCEL in terms of its transparencies, versatility and familiarity to the computer users. The program has the capability of handling arbitrary cross-sections that are without an axis of symmetry. Application of the program is illustrated with examples of typical cross-sections of structural walls. The calculated limiting curvature for the considered cross-sections were used to construct displacement profiles up the height of the wall for comparison with the seismically induced displacement demand.

The Study on the Efficient HVDC Capacity Considering Extremely Low Probability of 765kV Double Circuit Transmission Lines Trip

  • Moon, Bong-Soo;Ko, Boyung;Choi, Jin-San
    • Journal of Electrical Engineering and Technology
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    • v.12 no.3
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    • pp.1046-1052
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    • 2017
  • The load on the power grid of South Korea is expected to grow continuously until the late 2020s, and it is necessary to increase the transfer capacity from the Eastern grid to the Seoul-Gyeonggi region by reinforcing the transmission network for the electric power system to remain stable. To this end, the grid reinforcement by two bipole LCC HVDC transmission systems have been considered on account of the public acceptability and high growth of the fault current level, even though an additional 765kV system construction is more economical. Since the probability of the existing 765kV double circuit transmission line trip is extremely low, a dynamic simulation study was carried out to estimate the efficient HVDC capacity able to stabilize the transient stability by utilizing the HVDC overload capability. This paper suggests the application plan to reduce the HVDC construction capacity with ensuring the transient stability during the 765kV line trip.

L-CAA : An Architecture for Behavior-Based Reinforcement Learning (L-CAA : 행위 기반 강화학습 에이전트 구조)

  • Hwang, Jong-Geun;Kim, In-Cheol
    • Journal of Intelligence and Information Systems
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    • v.14 no.3
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    • pp.59-76
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    • 2008
  • In this paper, we propose an agent architecture called L-CAA that is quite effective in real-time dynamic environments. L-CAA is an extension of CAA, the behavior-based agent architecture which was also developed by our research group. In order to improve adaptability to the changing environment, it is extended by adding reinforcement learning capability. To obtain stable performance, however, behavior selection and execution in the L-CAA architecture do not entirely rely on learning. In L-CAA, learning is utilized merely as a complimentary means for behavior selection and execution. Behavior selection mechanism in this architecture consists of two phases. In the first phase, the behaviors are extracted from the behavior library by checking the user-defined applicable conditions and utility of each behavior. If multiple behaviors are extracted in the first phase, the single behavior is selected to execute in the help of reinforcement learning in the second phase. That is, the behavior with the highest expected reward is selected by comparing Q values of individual behaviors updated through reinforcement learning. L-CAA can monitor the maintainable conditions of the executing behavior and stop immediately the behavior when some of the conditions fail due to dynamic change of the environment. Additionally, L-CAA can suspend and then resume the current behavior whenever it encounters a higher utility behavior. In order to analyze effectiveness of the L-CAA architecture, we implement an L-CAA-enabled agent autonomously playing in an Unreal Tournament game that is a well-known dynamic virtual environment, and then conduct several experiments using it.

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New tunnel reinforcement method using pressurized cavity expansion concept (천공홀 가압 팽창 개념을 도입한 터널 보조 신공법 연구)

  • Cho, In-Sung;Park, Jeong-Jun;Kim, Jong-Sun;Lee, In-Mo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.12 no.6
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    • pp.407-416
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    • 2010
  • A new tunnel auxiliary method is proposed in this paper which utilizes the concept of cavity expansion for tuunel reinforcement by forming an umbrella arch on the roof of tunnel. When an inflatable pipe is inserted and expanded by pressure in the bore hole of umbrella arch, the ground around the bore hole can be compacted so that the stress condition above the tunnel perimeter is favorably changed. In order to verify the reinforcement effect of new concept, pilot-scale chamber test, trapdoor test and numerical analysis were performed and compared. In pilot-scale chamber test, three types of inflatable pipes are tested to verify the capability of expansion, and the results arc compared with analytical results obtained by applying cavity expansion theory and with results obtained from finite clement analysis, and the experimental results showed agreeable matches with analytical and numerical ones. Numerical analysis of a tunnel and trapdoor test applied with the inflatable pipes are also performed to figure out the reinforcement effect of the proposed techniques, and the results implied that the new method with 3 directional inflatable pipe (no pressure to downward direction) can contribute to reduce tunnel convergence and face settlement.

Structural Relationship between Intellectual Capital and Organizational Performance in a Customer Service Organization: Focused on the Role of Dynamic Capability (고객서비스 조직의 지적자본과 조직성과 간의 구조적 관계: 동적역량의 역할을 중심으로)

  • Park, Paul;Cheong, Ki-Ju;Kim, Sora;Ryu, Il
    • The Journal of the Korea Contents Association
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    • v.14 no.12
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    • pp.911-923
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    • 2014
  • This study explores which organizational capital is important for the customer service center and how the organizational capital is linked to organization's performance through dynamic capability. In this study, total of 389 employees in customer service centers were surveyed for the analysis. The results indicate that relational capital and organizational culture were positively linked with collaborative behavior, capital share, and capital transformation. Also, structural capital was a significant factor in collaborative behavior. Organizational performance was positively affecting collaborative behavior and capital share. This study provides a practical guideline on how to manage organizational capital and supplement shortcomings for managers and counsellors at the customer service centers. Furthermore, the implications for the reinforcement and development of organizational capital were suggested in building a customer service center as a strategic and fundamental part of the company.

A Study on Improvement of Rationality and Stability of Allocation and Procurement of Defense Capability Improvement Cost -Focused on the Yearly Allocation and Procurement of Mid-Term Defense Plan- (방위력개선사업비 편성.확보의 합리성과 안정성 제고방안 -국방중기계획 연부액의 편성 및 확보방안을 중심으로-)

  • Choi, Joon-Hyouck;Lee, Pil-Jung
    • Journal of the military operations research society of Korea
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    • v.34 no.1
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    • pp.117-135
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    • 2008
  • The ROK's military is attempting to change to advanced information science force through 'the Defense Reform 2020', which essentially creates the requirements of new military force. Therefore, the importance of defense industry and defense budget have been emphasized in order to successfully promote military build-up. However, the ROK defence industry has been going serious difficulties in the present day, and what is worse, unreliable rationality stability of Defense Capability Improvement Cost put the industry in the harder situation. In this circumstances, the improvement measures of the rationality stability of Defense Capability Improvement Cost should be immediately studied to satisfy the requirements of ROK military force in a suitable time and the development of ROK defense industry. The purpose of this study was to propose reinforcement measures to improve the arrangement system of yearly allocation for Mid-term Defense Plan of defense capability improvement programs and connect Mid-term Defense Plan to National Fiscal Management Plan to raise the rationality stability of ROK Defense Capability Improvement Cost.

Study on Raising International Competitiveness of Korean Restaurant Business (우리나라 외식산업의 국제경쟁력 강화 방안에 관한 연구)

  • 조구현
    • Journal of Applied Tourism Food and Beverage Management and Research
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    • v.7
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    • pp.181-205
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    • 1997
  • It is expected that Korean restaurant business will become one of the most important contributors to the notion's economy by the year 2000. As the many visible and invisible trade barriers are tumbled down and market opening to foreign competition expedites, a strategy to solidify the competitiveness of the restaurant industry is urgently needed. Some of the strateges that need to sharpen the competity edge are as follows: 1. Development of restaurant business management knowhow and enhancement of information gathering capability. 2. Development of its own unique brand of food and service tailored to many different tastes of clientele. 3. Promotion of the industry's globalization efforts with the development of local restaurant brand & Korean traditional foods and with the expansion of foreign investment. 4. Reinforcement of staff training and provision of a compensation package to attract qualified personnel. 5. deregulation of many anachronistic laws and restrictions with government's full support for the industry to realize what it's supposed to be in the 21st century.

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Studies of Dapped Ended Beams with Disturbed Regions Containing T-headed bars and Steel fibers (헤디드 바와 강섬유로 보강한 Dapped Ended Beam의 구조 실험)

  • Choi Jin Hyouk;Lee Chang Hoon;Lee Joo Ha;Yoon Young Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.39-42
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    • 2005
  • This test program is to investigate the benefits of using headed bars to replace conventional stirrups and using steel fibers to reinforce in the disturbed regions in the dapped ended beam, This distribution of reinforcement was selected for aspects associated with the portion of beam section in bridge structures. The beams containing T-headed bars have a superior performance such as improved ductility, larger energy adsorption and enhanced post-peak load carrying capability. The capacity of DEB with steel fibers also show increase of ductility, shear strength, and crack.

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