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Investigation of Deflection and Vibration Criteria for Road Bridges
Hung X. Le,황의승 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.3
Deflection and vibration play an important role in the serviceability of bridges. Their limits are specified in design codes either for consideration or as requirements. To promote understanding of the role of deflection and vibration limits, a comprehensive literature review is presented and comparison is made to propose the rational method to control bridge vibration for human comfort. To investigate the vibration and deflection criteria and applicability for bridges, actual bridges to represent typical bridge types are selected for experimental tests and theoretical study. Comparisons of the experimental results of deflection, acceleration, and frequency with the theoretical results are performed to verify the validity of the theoretical models. To ensure the applicability of the design code, bridges are redesigned so that they have minimum capacities as required by the design code. Finally, the vibration parameters of actual bridges and bridges using minimum sections are compared with current design limits and proposed criteria.
Hung X. Le,김도영,황의승 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
The purpose of this paper is to investigate and compare the serviceability performance of deflection criteria for conventional and high performance bridges in terms of applicability and reliability. Experimental studies were performed on fourteen test bridges that represent typical types of conventional and high performance bridges. The measured vibrational characteristics are compared with those from theoretical models to verify the validity of the theoretical models. The verified bridge models are then used to calculate the deflection due to test trucks as well as normal truck traffic collected from a Weigh-In-Motion (WIM) system. To investigate the probabilistic characteristics, the mean maximum deflection for different time periods are determined via extrapolation. Statistical parameters of the probability distribution of deflection are also determined, and then the probabilities of failure and reliability indices are calculated. Finally, the applicability of design code is investigated and compared between conventional and high performance bridges.
Adaptive Video Streaming over HTTP with Dynamic Resource Estimation
Thang, Truong Cong,Le, Hung T.,Nguyen, Hoc X.,Pham, Anh T.,Kang, Jung Won,Ro, Yong Man The Korea Institute of Information and Commucation 2013 Journal of communications and networks Vol.15 No.6
Adaptive hypertext transfer protocol (HTTP) streaming has become a new trend to support adaptivity in video delivery. An HTTP streaming client needs to estimate exactly resource availability and resource demand. In this paper, we focus on the most important resource which is bandwidth. A new and general formulation for throughput estimation is presented taking into account previous values of instant throughput and round trip time. Besides, we introduce for the first time the use of bitrate estimation in HTTP streaming. The experiments show that our approach can effectively cope with drastic changes in connection throughput and video bitrate.
Adaptive Video Streaming over HTTP with Dynamic Resource Estimation
Truong Cong Thang,Hung T. Le,Hoc X. Nguyen,Anh T. Pham,강정원,노용만 한국통신학회 2013 Journal of communications and networks Vol.15 No.6
Adaptive hypertext transfer protocol (HTTP) streaminghas become a new trend to support adaptivity in video delivery. AnHTTP streaming client needs to estimate exactly resource availabilityand resource demand. In this paper, we focus on themost importantresource which is bandwidth. A new and general formulationfor throughput estimation is presented taking into account previousvalues of instant throughput and round trip time. Besides, weintroduce for the first time the use of bitrate estimation in HTTPstreaming. The experiments show that our approach can effectivelycope with drastic changes in connection throughput and video bitrate.