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Left-turn phasing selection considering vehicle to vehicle and vehicle to pedestrian conflicts

Journal of Traffic and Transportation engineering(English Edition) 2023年第1期10卷 58-69页

作者： Kakan C.Dey Md Tawhidur Rahman Subasish Das Amrit Manova Williams Wadsworth Department of Civil and Environmental engineering West Virginia UniversityMorgantownWV 26506USA AECOM Technical Services Inc.PhoenixAZ 85020USA Ingram School of engineering Texas State UniversitySan MarcosTX 78666USA davenport engineering CharlotteNC 28273USA

Left-turning vehicle movement at signalized intersections with permissive left-turn phases creates safety concerns due to the higher chance of conflict with opposing-through vehicles and *** this research,a simulation-based study was conducted to evaluate pedestrians’impact on traffic conflicts between left-turning vehicles and opposing-through vehicles(V-V conflicts)as well as traffic conflicts between left-turning vehicles and pedestrians(V-P conflicts)in the permissive left-turn phasing *** with different opposing-through volumes,left-turn volumes,number of opposing-through lanes,and pedestrian volumes were modeled in VISSIM,a traffic *** surrogate safety assessment model(SSAM)was used to estimate the number of V-V and VP *** effect of pedestrian presence on V-V and V-P conflicts was evaluated using simulation scenarios with and without pedestrian *** results revealed that pedestrian presence increased both V-V and V-P *** pedestrian presence increased the total number of traffic conflicts,permissive left-turn phasing processed fewer left-turn vehicles to maintain the same level of intersection safety with pedestrian presence compared to the no-pedestrian *** current left-turn phasing decision guidelines do not consider the impacts of pedestrian presence,this research quantified pedestrian-influenced and pedestrian-involved left-turn traffic conflicts to determine appropriate left-turn signal phasing decisions to ensure safe and efficient crossing of pedestrians and vehicles at signalized *** simulation-based study’s findings can be beneficial in the decision making of left-turn phasing selection as the before-after intersection safety performance analysis by collecting field data often resources intensive.

关键词： V-V conflicts V-P conflicts Left-turn phasing Pedestrian Warrants

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Statistical extremes and peak factors in wind-induced vibration of tall buildings

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2012年第1期13卷 18-32页

作者： Ming-feng HUANG Chun-man CHAN Wen-juan LOU Kenny Chung-Siu KWOK Institute of Structural engineering Zhejiang University Hangzhou 310058 China Department of Civil and Environmental engineering Hong Kong University of Science and Technology Hong Kong School of engineering University of Western Sydney NSW Australia

In the structural design of tall buildings, peak factors have been widely used to predict mean extreme responses of tall buildings under wind excitations. Vanmarcke＇s peak factor is directly related to an explicit measure of structural reliability against a Gaussian response process. We review the use of this factor for time-variant reliability design by comparing it to the conven- tional davenport＇s peak factor. Based on the asymptotic theory of statistical extremes, a new closed-form peak factor, the so-called Gamma peak factor, can be obtained for a non-Gaussian resultant response characterized by a Rayleigh distribution process. Using the Gamma peak factor, a combined peak factor method was developed for predicting the expected maximum resultant responses of a building undergoing lateral-torsional vibration. The effects of the standard deviation ratio of two sway components and the inter-component correlation on the evaluation of peak resultant response were also investigated. Utilizing wind tunnel data derived from synchronous multi-pressure measurements, we carried out a wind-induced time history response analysis of the Common- wealth Advisory Aeronautical Research Council （CAARC） standard tall building to validate the applicability of the Gamma peak factor to the prediction of the peak resultant acceleration. Results from the building example indicated that the use of the Gamma peak factor enables accurate predictions to be made of the mean extreme resultant acceleration responses for dynamic service- ability performance design of modem tall buildings.

关键词： Level-crossing rate (LCR) Wind-induced vibration Mean extreme response Combined resultant process Peakfactor method

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Extreme value of wind-excited response considering influence of bandwidth

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Journal of Modern Transportation 2013年第2期21卷 125-134页

作者： Guoqing Huang Xinzhong Chen Mingshui Li Liuliu Peng Research Center for Wind engineering School of Civil EngineeringSouthwest Jiaotong University Wind Science and engineering Research Center Department of Civil and Environmental EngineeringTexas Tech University

This paper addresses the peak factors of wind- excited responses including alongwind, acrosswind tall building responses and vortex-induced vibration considering the bandwidth parameter. The influence of bandwidth parameter on the peak factor is investigated using advanced upcrossing theory taking the bandwidth influence into account. Results show that davenport＇s formula without consideration of bandwidth parameter servers well in general. However, the advanced upcrossing theory leads to a better prediction of the peak factor of wind-induced response of very lightly damped buildings.

关键词： Peak factors Wind-excited responses Upcrossing theory - Bandwidth

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Evaluating the environmental impact of selected chemical de-icers

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Transportation Safety and Environment 2019年第3期1卷 220-229页

作者： Xiang Li Benoit Van Aken Erica Mckenzie Huichun Zhang Bechara Abboud William davenport Civil&Environmental engineering Department Temple UniversityPhiladelphiaPAUSA Advanced Research Institute of Multidisciplinary Science Beijing Institute of TechnologyBeijingChina Department of Civil engineering Case Western Reserve UniversityClevelandOHUSA Department of Transportation PhiladelphiaPAUSA

In this study,the environmental impacts of six commercial chloride-based de-icer products,including Rock Salt and Salt Brine,were *** nutrients,oxygen demand,heavy metal concentration,corrosion and toxicity of all six de-icers were *** an assumed 500-fold dilution,the test results were compared to the public water-quality *** results show that the selected chemical de-icers have little chance of severely damaging the environment and ecosystem under a normal dilution ***,attention needs to be paid to small water bodies and sensitive receiving water.

关键词： chemical de-icer environmental impact corrosion test toxicity

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On Absolute Trace and Primitive Roots in a Finite Field

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数学进展 1988年第3期 324-325页

作者：孙琦韩文报 Sichuan University Information engineering College

In 1968,davenport proved Theorm *** finite field GF（p■）contains a primitive root r such that

关键词： GF root On Absolute Trace and Primitive Roots in a Finite Field

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Optimal Design of the Superstructure of an Offshore Tourism Platform by Using Numerical Simulation

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Journal of Marine Science and Application 2022年第3期21卷 128-137页

作者： Ruquan Yang Hongbo Wang Chaohe Chen School of Civil engineering and Transportation South China University of TechnologyGuangzhou 510641China Zhongkai University of Agriculture and engineering Guangzhou 510225China

This paper aims to reduce the wind resistance of the self-designed offshore tourism platform by optimizing its superstructure,and a transparent shape design is finally suggested.A numerical simulation was performed to calculate the wind load on the platform to test the effect of wind resistance *** original scale models(sealed and transparent)were established in accordance with the design *** numerical simulation uses the FLUENT software combined with the built-in self-compiled user-defined function(UDF).The stochastic wind was also applied on the basis of the davenport wind *** detached eddy simulation(DES)model was used to solve the NS *** simulation results show that the wind resistance reduction for the transparent shape model is subtle in the horizontal direction but can effectively reduce the drag force and moment in the vertical ***,the force variation of the transparent shape model under different wind attack angles decreases,which reduces the wind load fluctuations.

关键词： Offshore tourism platform Wind resistance Wind load Numerical simulation davenport wind spectrum

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Integrated heterogeneous silicon/Ⅲ –Ⅴ mode-locked lasers

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Photonics Research 2018年第5期6卷 468-478页

作者： MICHAEL L.davenport SONGTAO LIU JOHN E.BOWERS Department of Electrical and Computer engineering University of CafifomiaSanta BarbaraCalifomia 93106USA

The mode-locked laser diode has emerged as a promising candidate as a signal source for photonic radar systems,wireless data transmission, and frequency comb spectroscopy. They have the advantages of small size, low cost,high reliability, and low power consumption, thanks to semiconductor technology. Mode-locked lasers based on silicon photonics advance these qualities by the use of highly advanced silicon manufacturing technology. This paper will begin by giving an overview of mode-locked laser diode literature, and then focus on mode-locked lasers on silicon. The dependence of mode-locked laser performance on design details is presented.

关键词： Integrated heterogeneous silicon/Ⅲ-V mode-locked lasers

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On Diophantine approximation with one prime and three squares of primes

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Frontiers of Mathematics in China 2019年第4期14卷 761-779页

作者： Wenxu GE Feng ZHAO Tianqin WANG School of Mathematics Statist ics North China University of Water Resources and Elec trie Power Zhengzhou 450046 China School of Information engineering North China University of Water Resources and Electric Power Zhengzhou 450046 China

Let λ1,λ2,λ3,λ4 be non-zero real numbers, not all of the same sign, w real. Suppose that the ratios λ1/λ2,λ1/λ3 are irrational and algebraic. Then there are infinitely many solutions in primes pj, j = 1, 2,3,4, to the inequality |λ1p1 +λ2p^2/2 +λ3p^2/3+|λ4p^2/4+■(max{p1,p^2/2,p^2/3,p^2/4})-^5/64. This improves the earlier result.

关键词： Diophantine inequalities primes davenport-Heilbronn met hod sieve methods

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Multipartite matroids and secret sharing

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Chinese Science Bulletin 2010年第29期55卷 3261-3266页

作者： HSU ChingFang TANG XueMing CHENG Qi XIAO HaiJun College of Computer Science & Technology Huazhong University of Science and Technology Wuhan 430074 China Institute of Wuhan Digital engineering Wuhan 430074 China School of Mathematics & Physics China University ofGeosciences Wuhan 430074 China

In a secret-sharing scheme,a secret value is distributed among a set of participants by giving each participant a *** requirement is that only predefined subsets of participants can recover the secret from their *** family of the predefined authorized subsets is called the access *** access structure is ideal if there exists a secret-sharing scheme realizing it in which the shares have optimal length,that is,in which the shares are taken from the same domain as the *** and davenport proved that ideal access structures are induced by ***,ideal access structures and access structures induced by matroids have received a lot of *** gave the first example of an access structure induced by a matroid namely the Vamos matroid,that is *** every matroid is multipartite and has the associated discrete polymatroid,in this paper,by dealing with the rank functions of discrete polymatroids,we obtain a sufficient condition for a multipartite access structure to be ***,we give a new proof that all access structures related to bipartite and tripartite matroids coincide with the ideal *** results give new contributions to the open problem,that is,which matroids induce ideal access structures.

关键词：秘密共享方案拟阵访问结构接入结构最佳长度充分条件公开问题参与者

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Low phase noise hybrid silicon mode-locked lasers

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Frontiers of Optoelectronics 2014年第3期7卷 265-276页

作者： Sudharsanan SRINIVASAN Michael davenport Martijn J. R. HECK John HUTCHINSON Erik NORBERG Gregory FISH John BOWERS Department of Electrical and Computer engineering University of California Santa Barbara CA 93106 USA Department of engineering Aarhus University Aarhus Denmark Aurrion Inc. Goleta CA 93117 USA

In this paper, we review recent results on hybrid silicon mode-locked lasers with a focus on low phase noise optical pulse generation. Taking a high level design approach to lowering phase noise, we show the need for long on-chip optical delay lines for mode-locked lasers to reach and overcome material limits. Key results include demonstration of the longest （cavity length 9 cm） integrated on-chip mode locked laser, 14 dB reduction of Lorentzian noise on a 20 GHz radio-frequency （RF） signal, and greater than 55 dB optical supermode noise suppres- sion using harmonically mode locked long cavity laser, 10 GHz passively mode locked laser with 15 kHz linewidth using on-chip all optical feedback stabilization.

关键词： optoelectronic devices mode-locked lasers semiconductor lasers

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