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This paper mainly discusses the problem of ground-borne vibrations due to the planned line 8 of Beijing metro which passes under the National Measurement Laboratory. A lot of vibration sensitive equipments are placed in the laboratory. It is therefore necessary to study the impact of vibrations induced by metro trains on sensitive equipments and important to propound a feasible vibration mitigation measure. Based or1 the coupled periodic finite element-boundary element （FE-BE） method, a 3D dynamic track-tunnel-soil interaction model for metro line 8 has been used to predict vibrations in the free field induced by trains running at variable speeds between 30 km/h and 80 km/h. Four types of track structures commonly used on the Beijing metro network have been considered： （1） high resilience direct fixation fasteners, （2） Vanguard fasteners, （3） a floating slab track and （4） a floating ladder track. For each of these track types, the vibration isolation efficiency has been compared. The results of the numerical study can be used to predict vibrations in nearby buildings and to decide upon effective vibration countermeasures. 相似文献
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AbstractAdaptive learning and personalization have long been of great interest to learning designers and educators, and recent technological advances that have opened up a range of new possibilities for adaptivity. However, we lack clear definitions of the terms adaptivity and personalization, and the theoretical and empirical soundness of implementations of corresponding systems varies greatly. We therefore first provide definitions for key concepts related to adaptivity. We then discuss what variable systems should adapt for, how these variables can be measured, and what modifications to the learner experience can be made based on these variables. We propose a taxonomy of adaptivity that distinguishes adaptivity based on cognitive, emotional, motivational, and social/cultural variables, and that defines types of adaptivity at a macro-level and a micro-level. 相似文献
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Abstract Media managers in the 21st century will need to constantly assess and respond to emerging technologies that have the potential to disrupt the industry. This project examined the innovation‐management processes that the newspaper industry used to respond to the Internet, using an analytical framework of recommended innovation management techniques derived from previous research. The study found that newspapers’ innovation‐management processes were generally haphazard and that industry executives should be better prepared in the future to manage innovation. From a theoretical perspective, the study also found that organizational responses to emerging technology were related to the senior executive's perception of the nature of the technology. The paper concludes that future innovation management research should control for variances in the technology's perceived nature. 相似文献
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Clyde W. Holsapple Deepak Iyengar Haihao Jin Shashank Rao 《The Information Society》2013,29(4):199-218
Advances in Internet and other digital technologies have opened up new channels and methods for online business. They have also led to a situation where the same channels can be abused and misused. One of these forms of technology abuse, which is becoming increasingly prevalent these days, is the piracy of digital content. This article introduces a relatively comprehensive and unified theoretical framework for studying and understanding a major aspect of digital piracy: namely, software piracy. Based on Routine Activities Theory, Rational Choice Theory, and guardianship concepts, the framework identifies key parameters that can affect the incidence of software piracy. We apply the framework in conducting a systematic examination of 75 articles dealing with software piracy. The examination reveals that a considerable number of parameters have received little or no attention from software-piracy researchers. In addition to suggesting research opportunities, the framework furnishes a systematic approach for structuring the design of future research studies in the realm of software piracy. The insights furnished by this article contribute to future investigations of the software-piracy phenomenon that are needed to avert the economic and social damage caused by software piracy. 相似文献
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