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Transition engineering of transport in megacities with case study on commuting in Beijing
مهندسی انتقالی از حمل و نقل در شهرهای بزرگ با مطالعه موردی در مورد رفت و آمد در پکن-2020 Private automobiles have been wildly popular around the world and have transformed the concept of personal
mobility for the affluent. However, automobile-oriented development patterns have demonstrably degraded the
quality of the city environment. The economic burden of transport infrastructure asset management, plus air
pollution, CO2 emissions and congestion are pressing issues for all cities. City planners struggle with the issues of
growth in travel demand and the costs of providing traffic management, parking, policing, and emergency
services. The future of personal vehicle mobility and goods movements are particularly challenging, and it is
difficult to imagine what the sustainable solutions could be for these wicked problems of transport in megacities.
This paper explores urban form, transport activity and quality of life in future cities through the emerging
discipline, Transition Engineering. The main methodology is the Interdisciplinary Transition Innovation,
Management and Engineering (InTIME) approach, the outcome of which are innovative shift projects that directly
step down the negative factors and step up in the quality of life while maintaining the access to social and
economic activities. One shift project in Beijing is a new “Work Unit Retrofit” property development enterprise.
Integrated land use is a popular idea, but the shift projects in this research answer the questions of “how” the
transition to the future city occurs. This research demonstrates the new Transition Engineering approach to
sustainable city development that results in actionable property and infrastructure development with financial
and social benefits that can be clearly communicated to all stakeholders. Keywords: Energy transition | Transition engineering | Future cities | Work unit | Adaptive capacity | Urban form | Cycling potential | Commute model |
مقاله انگلیسی |
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An approach for physical layer security enhancement and PAPR reduction in OFDM-PON
یک رویکرد برای بهبود امنیت لایه فیزیکی و کاهش PAPR در OFDM-PON-2017 This work develops a solution for simultaneous physical layer security enhancement and peak-to-average power ratio (PAPR) reduction for orthogonal frequency division multiplexing passive optical network (OFDM-PON) systems. The encryption is carried out within the subcarriers with the help of three- dimensional (3-D) chaotic cat map. Experimental results demonstrate that the OFDM-PON system under the protection of the proposed technique is high sensitive to the secret key, invalid optical network units cannot obtain any useful information from the ciphertext. Besides, the PAPR of the OFDM symbols has also been significantly reduced, and hence the system is more robust against various nonlinear disturbances.© 2017 Elsevier Inc. All rights reserved. Keywords:Cat map | Peak-to-average power ratio | Orthogonal frequency division multiplexing | Passive optical network |
مقاله انگلیسی |