• 제목/요약/키워드: Hybrid Education

검색결과 333건 처리시간 0.024초

Parametric analysis of hybrid outrigger system under wind and seismic loads

  • Neethu Elizabeth Johna;Kiran Kamath
    • Structural Engineering and Mechanics
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    • 제86권4호
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    • pp.503-518
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    • 2023
  • In tall constructions, the outriggers are regarded as a structural part capable of effectively resisting lateral loads. This study analyses the efficacy of hybrid outrigger system in high rise RCC building for various structural parameters identified. For variations in α, which is defined as the ratio of the relative flexural stiffness of the core to the axial rigidity of the column, static and dynamic analyses of hybrid outrigger system having a virtual and a conventional outrigger at two distinct levels were conducted in the present study. An investigation on the optimal outrigger position was performed by taking the results from absolute maximum inter storey drift ratio (ISDmax), roof acceleration (accroof), roof displacement (disproof), and base bending moment under both wind and seismic loads on analytical models having 40, 60 and 80 storeys. An ideal performance index parameter was introduced and was utilized to obtain the optimal position of the hybrid outrigger system considering the combined response of ISDmax, accroof, disproof and, criteria required for the structure under wind and seismic loads. According to the behavioural study, increasing the column area and outrigger arm length will maximise the performance of the hybrid outrigger system. The analysis results are summarized in a flowchart which provides the optimal positions obtained for each dependent parameter and based on ideal performance index which can be used to make initial suggestions for installing a hybrid outrigger system.

기독교 대학에서의 하이브리드 교육을 통한 기독교교육 가능성 탐색 (Exploratory Study on Christian Education through Hybrid Education System in Christian Universities)

  • 봉원영
    • 한국콘텐츠학회논문지
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    • 제14권6호
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    • pp.513-528
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    • 2014
  • 디지털 정보통신의 발달은 여러 미디어 관련 분야들이 융복합의 형태로 발전하면서 사회의 각 분야에 급속한 변화를 이끌어 온라인 교육의 혁명을 가져오게 되었다. 이것이 교육환경에 영향을 미쳐 기존의 교수자 중심 교육에서 학습자 중심교육으로 바뀌게 했다. 온라인 교육은 시간과 공간의 제약에서 벗어나 기본적 인프라가 구축되어 있는 곳이면 언제 어디서든 수업이 가능하다는 장점을 가지고 있다. 또한 이것은 반복학습 혹은 반복교수가 가능하기 때문에 학습자는 자신의 학습 유형(learning style)과 학습 성향 (learning orientation)에 맞는 수업을 받을 수 있게 되어 궁극적으로는 맞춤형 학습(customized learning)이 가능하게 한다. 그러나 이러한 온라인 교육의 장점 속에서도 여전히 면대면 교육의 필요성이 대두되는 바, 이 두 가지 방식을 적절히 혼합하여 상호 보완한 하이브리드 교육이 등장하게 되었다. 이러한 상황에서 앞으로도 온라인 교육은 계속해서 더욱 발전할 것이므로 기독교 대학은 향후 온라인 교육방식의 미래를 예측하면서 이에 대한 충분한 이해와 연구를 통해서 다양하게 활용해야 할 것이다.

Power Quality Disturbances Identification Method Based on Novel Hybrid Kernel Function

  • Zhao, Liquan;Gai, Meijiao
    • Journal of Information Processing Systems
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    • 제15권2호
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    • pp.422-432
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    • 2019
  • A hybrid kernel function of support vector machine is proposed to improve the classification performance of power quality disturbances. The kernel function mathematical model of support vector machine directly affects the classification performance. Different types of kernel functions have different generalization ability and learning ability. The single kernel function cannot have better ability both in learning and generalization. To overcome this problem, we propose a hybrid kernel function that is composed of two single kernel functions to improve both the ability in generation and learning. In simulations, we respectively used the single and multiple power quality disturbances to test classification performance of support vector machine algorithm with the proposed hybrid kernel function. Compared with other support vector machine algorithms, the improved support vector machine algorithm has better performance for the classification of power quality signals with single and multiple disturbances.

NON-CONVEX HYBRID ALGORITHMS FOR A FAMILY OF COUNTABLE QUASI-LIPSCHITZ MAPPINGS CORRESPONDING TO KHAN ITERATIVE PROCESS AND APPLICATIONS

  • NAZEER, WAQAS;MUNIR, MOBEEN;NIZAMI, ABDUL RAUF;KAUSAR, SAMINA;KANG, SHIN MIN
    • Journal of applied mathematics & informatics
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    • 제35권3_4호
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    • pp.313-321
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    • 2017
  • In this note we establish a new non-convex hybrid iteration algorithm corresponding to Khan iterative process [4] and prove strong convergence theorems of common fixed points for a uniformly closed asymptotically family of countable quasi-Lipschitz mappings in Hilbert spaces. Moreover, the main results are applied to get the common fixed points of finite family of quasi-asymptotically nonexpansive mappings. The results presented in this article are interesting extensions of some current results.

하이브리드 진로코칭 모형 개발 및 효과분석 (Development of Hybrid Career Coaching Model and Effect Analysis)

  • 고은현;박혜림;김도현
    • 컴퓨터교육학회논문지
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    • 제18권6호
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    • pp.43-51
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    • 2015
  • 본 논문의 목적은 진로 상담 분야에서 직접 코치와 학습자가 만나서 확인하고 상담하는 면대면 코칭과 인터넷을 통해 코치와 학습자가 상담하는 E-코칭을 조합한 하이브리드 진로코칭 모형을 개발하고 대학생들의 진로 지도에 적용하고 그 효과를 분석하는데 있다. 하이브리드 진로코칭에서는 프로파일, 적성 검사 등 인터넷 상에서 원격 접속하여 수행 가능하고 데이터 저장이 필요한 것은 E-코칭으로 처리하고, 점검, 상담 및 성찰 등 학생의 상황을 파악하고 대화가 필요한 부분은 면대면으로 설계하였다. 제안한 하이브리드 진로코칭 모형은 진로코칭 안내, 자기이해, 진로의사결정, 진로실행계획 수립, 실행계획 및 실행의지 점검, 실행결과 점검 6단계로 나누어 진행하였다. 하이브리드 진로코칭 모형을 대학생에게 적용하여 진로개발을 위한 인지적, 행동적 행동변화를 촉진하고 그 효과를 분석하였다. 연구 결과 진로준비행동이 높아졌으며, 코칭을 통해 자신의 현재 상태 분석과 실행 전략이 중요성 및 학습법과 자기조절능력 등을 획득하였다고 분석되었다. 이러한 결과를 토대로 이 연구에서 개발된 하이브리드 진로코칭 모형은 진로지도가 강화되는 대학에서 교수의 진로지도를 지원할 수 있을 것이라 기대된다.

냉각식 시스템과 비교한 복합식 제습냉방시스템의 냉각 열량증가에 관한 실험적 연구 (Study on the Energy Efficiency Improvement of Hybrid Dehumidification Air Conditioning System Compared with Refrigeration System)

  • 이수동;박문수;정진은;최영석
    • 설비공학논문집
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    • 제16권10호
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    • pp.952-959
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    • 2004
  • The hybrid liquid desiccant air conditioning system has been in use for many years, primarily in industrial process applications requiring dehumidification and humidity control. In this study, the hybrid dehumidifier has been designed to study the dehumidification characteristic of the aqueous triethylene glycol (TEG) solution. The experimental results show energy efficient characteristics of hybrid liquid desiccant air conditioning system compared with the refrigeration system in terms of energy use, the difference of pressure loss between hybrid liquid desiccant air conditioning system and refrigeration system. Data obtained are useful for design guidance and performance analysis of the hybrid air conditioning system.

Mechanical Properties of Styrene-Butadiene Rubber Reinforced with Hybrids of Chitosan and Bamboo Charcoal/Silica

  • Li, Xiang Xu;Cho, Ur Ryong
    • Elastomers and Composites
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    • 제54권1호
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    • pp.22-29
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    • 2019
  • Chitosan-polyvinyl alcohol (PVA) -bamboo charcoal/silica (CS-PVA-BC/SI) hybrid fillers with compatibilized styrene-butadiene rubber (SBR) composites were fabricated by the interpenetrating polymer network (IPN) method. The structure and composition of the composite samples were characterized by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FT-IR). The viscoelastic behaviors of the rubber composites and their vulcanizates were explored using a rubber processing analyzer (RPA) in the rheometer, strain sweep and temperature sweep modes. The storage and loss moduli of SBR increased significantly with the incorporation of different hybrid fillers, which was attributed to the formation of an interphase between the hybrid fillers and rubber matrix, and the effective dispersion of the hybrid fillers. The mechanical properties (hardness, tensile strength, oxygen transmission rate, and swelling rate) of the composite samples were characterized in detail. From the results of the mechanical test, it was found that BC-CS-PVA0SBR had the best mechanical properties. Therefore, the BC-CS-PVA hybrid filler provided the best reinforcement effects for the SBR latex in this research.

Verification of Hybrid Real Time HVDC Simulator in Cheju-Haenam HVDC System

  • Yang Byeong-Mo;Kim Chan-Ki;Jung Gil-Jo;Moon Young-Hyun
    • Journal of Electrical Engineering and Technology
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    • 제1권1호
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    • pp.23-27
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    • 2006
  • In this paper a Hybrid Real Time HVDC Simulator fur both operator Training and Researching in the Cheju-Haenam HVDC System is proposed and its performance is studied by means of RTDS (Real Time Digital Simulator), EMTDC (Electro-Magnetic Transients system for DC), PSS/E (Power System Simulator for Engineering), and experienced scenarios. The objective of this paper is to represent the strategy in development for KEPCO's hybrid HVDC simulator for the Cheju-Haenam HVDC system. This simulator consists of two DC stations, DC cables, external digital/analog controllers, monitoring systems and control desk for education, and AC networks. Its suitability for operator's education is tested during startup/shutdown and normal state operations. Dynamic performances of it are also verified.

연축전지와 리튬이온전지용 하이브리드 ESS의 최적구성방안에 관한 연구 (A Study on Estimation Method for Optimal Composition Rate of Hybrid ESS Using Lead-acid and Lithium-ion Batteries)

  • 박수영;유상원;박재범;김병기;김미영;노대석
    • 전기학회논문지
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    • 제65권6호
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    • pp.962-968
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    • 2016
  • The large scaled lead-acid battery is widely used for efficient operation of the photovoltaic system in many islands. However, lithium-ion battery is now being introduced to mitigate the fluctuation of wind power and to replace lead-acid battery. Therefore, hybrid ESS(Energy Storage system) that combines lithium-ion battery with lead-acid battery is being required because lithium-ion battery is costly in present stage. Under this circumstance, this paper presents the optimal algorithm to create composition rate of hybrid ESS by considering fixed and variable costs in order to maximize advantage of each battery. With minimization of total cost including fixed and variable costs, the optimal composition rate can be calculated based on the various scenarios such as load variation, life cycle and cost trend. From simulation results, it is confirmed that the proposed algorithms are an effective tool to produce a optimal composition rate.

연축전지와 리튬이온전지용 하이브리드 BMS 알고리즘 개발 (Development of Hybrid BMS(Battery Management System) Algorithm for Lead-acid and Lithium-ion battery)

  • 오승택;김병기;박재범;노대석
    • 한국산학기술학회논문지
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    • 제16권5호
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    • pp.3391-3398
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    • 2015
  • 현재 대부분의 도서지역에서는 태양광발전을 효율적으로 운용하기 위하여 대용량 연축전지가 많이 사용되고 있지만, 풍력발전의 도입, 축전지 교체로 인하여 리튬이온전지의 도입이 증가하고 있다. 따라서 본 논문에서는 기존에 많이 보급되어 사용되고 있는 연축전지와 리튬이온전지의 장점을 최대한 활용하기 위하여, 연축전지와 리튬이온전지용 하이브리드 BMS 알고리즘을 제시하였다. 즉, 각 전지의 충전상태(state of charge, SOC)를 평가하는 알고리즘과 각 전지의 도입비용과 운용비용에 따른 최적 구성비를 산출하는 하이브리드 운용 알고리즘을 제안하였다. 상기의 알고리즘을 이용하여 다양한 시뮬레이션을 수행한 결과, 기존의 충전상태 평가 방법보다 오차율이 개선되어 정확한 충전상태에 대한 결과가 산출되었고, 각 전지의 도입비용과 운용비용이 최소화되는 조건에서 최적구성비를 구하여, 본 논문에서 제안한 하이브리드 BMS 알고리즘의 유용성을 확인하였다.