• Journal of the Computational Structural Engineering Institute of Korea
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• v.22 no.3
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• pp.231-242
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• 2009

In the design of a sky-bridge, repetitive boundary nonlinear time history analyses are required to accurately predict dynamic behaviors of the connected buildings because the connection systems of a sky-bridge usually have high nonlinearity. If a conventional finite element model for entire high-rise buildings is used for repetitive boundary nonlinear time history analyses, computational efforts could be significant. In this study, an equivalent cantilever model considering the belt-wall effect has been proposed for an efficient dynamic analysis and a performance evaluation of vibration control of high-rise buildings connected by a sky-bridge. To verify the accuracy and efficiency of the proposed equivalent model, boundary nonlinear time history analyses of 49- and 42-story example buildings connected by a sky-bridge have been performed for wind excitation. Based on the analytical results, it has been verified that the proposed equivalent model can provide accurate dynamic responses of building structures connected by a sky-bridge with significantly reduced computational efforts.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2008.04a
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• pp.203-208
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• 2008

Recently, high-rise building structures connected by a sky-bridge are frequently constructed. To predict accurate dynamic responses of structures connected a sky-bridge, time history analysis is required. Repetitive analyses are required in the design process. If the entire structure model is employed in the repetitive time history analysis, it would take a lot of computational time and engineers' efforts. Therefore, an equivalent model for high-rise building structures connected by a sky-bridge was proposed in this study. The proposed model consists of cantilever having original structure's stiffnesses and masses. Based on the analytical results, it has been shown that the equivalent model can reduce the analysis time and provide similar seismic responses to the original model.

• Journal for History of Mathematics
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• v.14 no.2
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• pp.149-154
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• 2001

In this paper we represent the Ahlfors function on the multiply connected planar domain, especially on an annulus and apply it to the Caratheodory metric.

• Journal for History of Mathematics
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• v.15 no.2
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• pp.93-100
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• 2002

Mathematics and music play very different roles in our society. However, they are closely related to each other In the time of the ancient Greeks, they were strongly connected. This paper identifies such connection and concludes that music has mathematical characteristics.

• Earthquakes and Structures
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• v.15 no.2
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• pp.203-214
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• 2018

Deflection control in tall buildings is a challenging issue. Connecting of the towers is an interesting idea for architects as well as structural engineers. In this paper, two reinforced concrete core-wall towers are connected by a truss bridge with buckling restrained braces. The buildings are 40 and 60-story. The effect of the location of the bridge is investigated. Response spectrum analysis of the linear models is used to obtain the design demands and the systems are designed according to the reliable codes. Then, nonlinear time history analysis at maximum considered earthquake is performed to assess the seismic responses of the systems subjected to far-field and near-field record sets. Fiber elements are used for the reinforced concrete walls. On average, the inter-story drift ratio demand will be minimized when the bridge is approximately located at a height equal to 0.825 times the total height of the building. Besides, because of whipping effects, maximum roof acceleration demand is approximately two times the peak ground acceleration. Plasticity extends near the base and also in major areas of the walls subjected to the seismic loads.

• Asian review of World Histories
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• v.3 no.1
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• pp.59-80
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• 2015

The paper is oriented towards a reflection on the epistemological extension of world history. This discipline is currently opening up for new subjects and new foci of interest, with environmental history being one of them. The paper debates the interaction between the global and the local as one of the main issues of world history. It analyses the impacts of the interconnectivity of diverse regions as well as different geographical and cultural complexes, during the period between 1500 and 1800. Assuming that the sea in its economic, cultural and environmental dimensions contributed actively to world history, and is, in itself, a major factor of globalization, the paper intends to highlight interdependencies which fostered connections between the local and the global. It further submits to discussion which was the impact of an on-going globalization process, based on maritime dynamics, on the environment. Through an analysis centered on the impact of European overseas expansion, some environmental impacts will be analyzed. The paper aims at questioning environmental history as an emergent theme of world history, based on the historical experience of connecting worlds developed in the First Global Age (1500-1800).

• The Journal of Korean Medical History
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• v.19 no.1
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• pp.77-97
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• 2006

Korean traditional Oriental medicine is a medical system that has been developed based on the locality and history of Korea as well as the blood and constitution of Korean people. It is closely connected to Korean history and culture, and is in close internal linkage with oral and written legends, traditions and folktales. Referring to previous researches on these legends, the present study extracted medicine related legends from various legend collections, classified them by subject, analyzed representative cases, and examined their meanings and values in terms of medical culture.

• Journal for History of Mathematics
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• v.26 no.4
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• pp.301-320
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• 2013

Although many people have recognized the importance of history of mathematics in mathematics education, there are few studies that history and mathematics educations are connected. In this paper, we present and discuss the ways of introducing the instruction with mathematics machines. This instruction use the history of mathematics as part of a class not as a tool to stimulate students' interest but as a goal that it can be targeted mathematical itself. To do this, we first analyze the characteristics of applying history of mathematics in mathematical education, second, describe the meaning and the educational value of mathematical machines, and finally explained the way of applying history of mathematics with mathematics machines. The Instruction of history of mathematics with mathematics machines has advantages that practice (manipulation and experiment) and theory (elaboration of definition, production of conjectures and constructions of proofs) are interlaced within a historic-cultural perspective.

• Electronics and Telecommunications Trends
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• v.33 no.2
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• pp.1-9
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• 2018

In the past, the Internet connected people together; recently, however it has been extended to the Internet of Things (IoT), allowing all things in the physical world to be connected. We call a new society in which everything is connected through IoT a 'hyper-connected society'. IoT for a hyper-connected society is more than just connecting things to the Internet, it is an infrastructure providing intelligent services without human intervention by connecting things to the Internet using sensors and communication functions, collecting data from connected things, and analyzing and predicting information. Therefore, IoT is a convergence technology that includes not only sensors and communication networks but also big data and AI. This paper examines the short history of IoT, reviews its current trends, and finally, discusses its future direction.

• The Korean Journal of Archival Studies
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• no.10
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• pp.112-144
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• 2004

Oral history has value that steps over the class consciousness and party feeling that records have, and enables a general representation of a human experience. Beside, It must be managed urgently because a collection of oral history has unique and limited. However, domestic related institution do not keep management for release and use of oral history in their mind are only concentrating on accession. Lately, National History Compilation Committee passes through faithful planning procedures and is collecting an oral history collection project. A merit of this project is to have attempted an image photographing. This study is propose that to examines over the all steps to say oral history collection activity to information service and a preservation from collection planning of organization. However, this study is insufficient in the management method how it is connected if does in order to manage the oral history which is collected with a part of a record in a archival institution because this study was only for the purpose of management of oral history. This problem will be studied through a process of checking the real thing of oral history. This study proposed general methodology for oral history management, if institution had a plan of collection and management or had some collection result.