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arXiv 2024年

作者： Zhong, Xinzhi Zhou, Yang Kamaraj, Varshini Zhou, Zhenhao Kontar, Wissam Negrut, Dan Lee, John D. Ahn, Soyoung Department of Civil and Environmental Engineering University of Wisconsin-Madison United States Zachry Department of Civil and Environmental Engineering Texas A&M College Station United States Department of Industrial and Systems Engineering University of Wisconsin-Madison United States Department of Mechanical Engineering University of Wisconsin-Madison United States

This paper develops a novel car-following control method to reduce voluntary driver interventions and improve traffic stability in Automated Vehicles (AVs). Through a combination of experimental and empirical analysis, we show how voluntary driver interventions can instigate substantial traffic disturbances that are amplified along the traffic upstream. Motivated by these findings, we present a framework for driver intervention based on evidence accumulation (EA), which describes the evolution of the driver’s distrust in automation, ultimately resulting in intervention. Informed through the EA framework, we propose a deep reinforcement learning (DRL)-based car-following control for AVs that is strategically designed to mitigate unnecessary driver intervention and improve traffic stability. Numerical experiments are conducted to demonstrate the effectiveness of the proposed control model. The code supporting the findings of this study are available in Github page. © 2024, CC BY.

关键词： Reinforcement learning

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Real-Time Activity Duration Extraction of Crane Works for Data-Driven Discrete Event Simulation 22

Real-Time Activity Duration Extraction of Crane Works for Da...

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Proceedings of the Winter Simulation Conference

作者： Manuel Jungmann Lucian Ungureanu Timo Hartmann Hector Posada Rolando Chacon Civil Systems Engineering Technische Universität Berlin Berlin GERMANY Civil and Environmental Engineering Universitat Politècnica de Catalunya Barcelona SPAIN

The construction industry is struggling with low productivity rates because of a low level of digitalization, dynamic interactions, and uncontrollable circumstances on sites, which make the planning process complex. Usage of the digital twin construction paradigm enables to facilitate construction management and leverage the sector's unexploited potential. This research addresses current shortcomings by real-time discrete event simulation. During crane operations, kinematic data were collected, which were classified by machine learning algorithms for activity recognition and duration extraction. Based on the identified durations, Goodness-of-Fit techniques determined suitable probability density functions. The resulting probability density functions were used as input parameters in stochastic discrete event simulations. It was shown that with enriched data collection, probability density functions have to be updated. The data-driven discrete event simulation facilitates decision-making processes by providing more reliable real-time information for the planning of upcoming construction works. Thus, data-based instead of experience-based management can be enabled.

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Global increase in the occurrence and impact of multiyear droughts

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Journal of Bio-X Research 2025年第6731期387卷 278-284页

作者： Chen, Liangzhi Brun, Philipp Buri, Pascal Fatichi, Simone Gessler, Arthur McCarthy, Michael James Pellicciotti, Francesca Stocker, Benjamin Karger, Dirk Nikolaus Swiss Federal Institute for Forest Snow and Landscape Research WSL Birmensdorf Switzerland Department of Civil and Environmental Engineering National University of Singapore Singapore Department of Environmental Systems Science ETH Zurich Zurich Switzerland Institute of Science and Technology Austria (ISTA) Klosterneuburg Austria Institute of Geography University of Bern Bern Switzerland Oeschger Centre for Climate Change Research University of Bern Bern Switzerland

Persistent multiyear drought (MYD) events pose a growing threat to nature and humans in a changing climate. We identified and inventoried global MYDs by detecting spatiotemporally contiguous climatic anomalies, showing that MYDs have become drier, hotter, and led to increasingly diminished vegetation greenness. The global terrestrial land affected by MYDs has increased at a rate of 49,279 ± 14,771 square kilometers per year from 1980 to 2018. Temperate grasslands have exhibited the greatest declines in vegetation greenness during MYDs, whereas boreal and tropical forests have had comparably minor responses. With MYDs becoming more common, this global quantitative inventory of the occurrence, severity, trend, and impact of MYDs provides an important benchmark for facilitating more effective and collaborative preparedness toward mitigation of and adaptation to such extreme events. © 2025 American Association for the Advancement of Science. All rights reserved.

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To what extent can solids retention time be reduced without deteriorating the performance of the thermal hydrolysis pretreatment-enhanced mesophilic anaerobic digestion 96

To what extent can solids retention time be reduced without ...

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96th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2023

作者： Li, Yitao Luo, Hao Strawn, Mary Racey, Lisa Haile, Fasil Balchunas, Brian Moline, Christopher Hentz, Lawrence Wang, Zhi-Wu Department of Civil and Environmental Engineering Virginia Tech BlacksburgVA24061 United States Arlington County Water Pollution Control Bureau ArlingtonVA22202 United States HDR Engineering Inc. ViennaVA22180 United States Department of Biological Systems Engineering Virginia Tech BlacksburgVA24061 United States

The solids retention time of anaerobic digesters is one of the most important parameters for operational and design purposes. It has been believed to have the potential for process intensification with thermal hydrolysis pretreatment upstream. To assess the extent and impact of digester solids retention time reduction, the digestibility and dewaterability of three pilot-scale, continuous flow, mesophilic anaerobic digesters operating at 15-, 12.5-, and 10-day SRT were evaluated. These 10-liter digesters were fed with 9% total solids CAMBITM THP-processed primary and wasted activated sludge every day for nearly a year. The study revealed that shortening the solids retention time from 15 to 10 days linearly decreased volatile solids reduction from 60.7% to 53.6%, highlighting the reduction in hydrolysis rate as the major drawback. However, other digester performance parameters such as methane yield, rheology, and dewaterability largely remained unchanged. Copyright © 2023 Water Environment Federation.

关键词： Anaerobic digestion

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Navigating Innovation within a Contractor’s Business Model: A System Dynamics Approach

Navigating Innovation within a Contractor’s Business Model:...

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IEEE International Conference on System of systems engineering (SoSE)

作者： Mariam Elazhary Cihan Dagli Islam H. El-Adaway Ph.D. Graduate Student Dept. of Civil Architectural and Environmental Engineering Missouri Univ. of Science and Technology Rolla MO Professor Dept. of Engineering Management and Systems Engineering Missouri Univ. of Science and Technology Rolla MO Professor Dept. of Civil Architectural and Environmental Engineering Dept. of Engineering Management and Systems Engineering Missouri Univ. of Science and Technology Rolla MO

ISBN: (数字)9798350365917

ISBN: (纸本)9798350365924

Innovation is essential in the construction industry, but current practices often focus narrowly on specific aspects rather than taking a comprehensive approach. To address this, systematic innovation through business model innovation (BMI) is proposed to enhance overall performance. Despite increasing interest in BMI research, it remains in its early stages, lacking quantitative analysis of its impact on business model components. This paper develops a framework using system dynamics to assess changes to a construction company’s BM when faced with a variety of innovations across various projects. This shall be accomplished by (1) establishing factors and their relationships that define a contractor’s BM over time, (2) modeling the said factors using AnyLogic using synthetic data, and (3) evaluating the emergent behavior of BM’s value creation. The study found that the impact of innovation on a contractor’s long-term value creation is not linear; it varies based on when and what type of innovation is implemented. This complexity arises from the trade-offs between cost reductions and additional expenses associated with innovation. The paper introduces a comprehensive framework to assess how innovation affects a contractor’s business model, enabling practitioners to understand better and manage their long-term value-creation strategies.

关键词： Technological innovation Systematics System dynamics Statistical analysis Navigation Data models Modeling

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Integrated Sensor-Based Interface for Human-Robot Collaboration in Construction 39

Integrated Sensor-Based Interface for Human-Robot Collaborat...

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39th International Symposium on Automation and Robotics in Construction, ISARC 2022

作者： Wang, X. Veeramani, D. Zhu, Z. Department of Civil and Environmental Engineering University of Wisconsin-Madison 1415 Engineering Drive MadisonWI53706 United States Department of Industrial and Systems Engineering University of Wisconsin-Madison 1513 University Avenue MadisonWI53706 United States

ISBN: (纸本)9789526952420

Construction robots have the potential to increase construction productivity at job sites and can help overcome industry challenges such as labor shortage and safety risks. User-friendly interfaces are critical for advancing human-robot work collaboration and increasing use of construction robots. However, human-robot interfaces in the context of construction industry applications have been investigated to a limited extent only. This paper proposes a novel sensor-based framework which integrates eye tracking and hand gesture recognition for human-robot interaction in construction. Specifically, it begins with visual detection of construction machines in the first-person views. Then, the machine-of-interest is determined based on the detection results and human gaze points. Finally, a real-time hand gesture recognition system is employed for conveying messages to the machine to guide its operations. So far, the proposed framework was tested in a laboratory setting using a robotic dump truck. The results showed that the proposed framework could serve an effective interface to support the interactions between workers and construction machines. © 2022 International Association on Automation and Robotics in Construction.

关键词： Eye tracking

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Dynamic Balancing-Charging Management for Shared Autonomous Electric Vehicle systems: A Two-Stage Learning-Based Approach

Dynamic Balancing-Charging Management for Shared Autonomous ...

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International Conference on Intelligent Transportation

作者： Xiaolei Zhu Xindi Tang Jiaohong Xie Yang Liu Department of Civil and Environmental Engineering National University of Singapore Singapore School of Management Science and Engineering Central University of Finance and Economics China Department of Industrial Systems Engineering and Management National University of Singapore Singapore Department of Civil and Environmental Engineering and Department of Industrial Systems Engineering and Management National University of Singapore Singapore

The proliferation of car-sharing systems, a key component of sustainable urban mobility, has significantly contributed to the shift towards green transportation modes. However, balancing supply and demand in large-scale Shared Autonomous Electric Vehicle Services (SAEVSs) remains a critical yet challenging task, particularly considering the stochastic spatio-temporal dynamics and limited charging resources. To jointly optimize fleet management and charging decisions, we propose a two-stage learning-based approach that integrates the foresight capabilities of Deep Reinforcement Learning (DRL) techniques with the precision of optimization methods. We develop a multi-agent DRL model, acting as a “Manager” that generates prescient grid-level Balancing-Charging (BC) strategies, guiding the relocation and charging decisions. Furthermore, we customize the space-time-battery network flow model to make optimal vehicle-level decisions as a “Worker”, which follows the far-sighted guidance from the Manager to make high-quality and real-time decisions. Through extensive experiments conducted on a city-scale SAEVS, we demonstrate our proposed approach significantly outperforms benchmark models in terms of both system-level profit and service quality. Our two-stage approach also lays a methodological basis for further exploring the integration of DRL and optimization techniques, with the aim of enhancing decision-making capabilities in urban mobility systems.

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Dynamic equilibrium analyses in a ride-sourcing market under travel time uncertainty

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Transportation Research Part C: Emerging Technologies 2023年第1期153卷

作者： Liang, Zheng Jiang, Gege Lo, Hong K. Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong School of Intelligent Systems Engineering Sun Yat-sen University China

This paper proposes a dynamic equilibrium framework for the morning commute problem in the ride-sourcing market under travel time uncertainty. It is formulated as a simultaneous departure time and mode choice problem (SDTMCP) with random travel delay. Commuters are considered to choose among four travel modes: (1) driving alone, (2) taking non-shared service, (3) taking ride-sharing service, and (4) taking the metro. The equilibrium state is reached when no commuter can reduce their expected travel cost by unilaterally changing their mode or departure time. We derive the dynamic equilibrium queuing patterns analytically under certain assumptions, and develop an approach using nonlinear complementarity problem (NCP) to solve general problems where analytical results cannot be readily derived. We further explore the pricing strategy of the ride-sourcing platform, in which travel time uncertainty and the prices of ride-sourcing services jointly determine the profit performance. A mathematical program with equilibrium constraints (MPEC) is formulated to search for the optimal service prices to achieve the maximum profit. The framework is then extended to investigate the pricing strategy in a two-sided ride-sourcing market and examine the metro crowdedness effect in the numerical studies. © 2023 Elsevier Ltd

关键词： Profitability

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A Study of an Atomic Mobility Game With Uncertainty Under Prospect Theory

A Study of an Atomic Mobility Game With Uncertainty Under Pr...

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European Control Conference (ECC)

作者： Ioannis Vasileios Chremos Heeseung Bang Aditya Dave Viet-Anh Le Andreas A. Malikopoulos Department of Mechanical Engineering University of Delaware Newark DE USA School of Civil and Environmental Engineering Cornell University Ithaca NY USA Systems Engineering Cornell University Ithaca NY USA

ISBN: (数字)9783907144107

ISBN: (纸本)9798331540920

In this paper, we present a study of a mobility game with uncertainty in the decision-making of travelers and incorporate prospect theory to model travel behavior. We formulate a mobility game that models how travelers distribute their traffic flows in a transportation network with splittable traffic, utilizing the Bureau of Public Roads function to establish the relationship between traffic flow and travel time cost. Given the inherent non-linearities and complexity introduced by the uncertainties, we propose a smooth approximation function to estimate the prospect-theoretic cost functions. As part of our analysis, we characterize the best-fit parameters and derive an upper bound for the error. We then show the existence of an equilibrium and its its best-possible approximation.

关键词： Uncertainty Upper bound Costs Roads Decision making Transportation Europe

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Chemical weathering profile in the V–Ti–Fe mine tailings pond:a basalt-weathering analog

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Acta Geochimica 2023年第6期42卷 1035-1050页

作者： Xiaolin Zhang Yinger Deng Liang Tang Zhengmeng Hou Jinsong Yang College of Environment and Civil Engineering Chengdu University of TechnologyChengduChina Longchang Natural Resources and Planning Bureau Longchang 642150SichuanChina College of Earth Sciences Chengdu University of TechnologyChengdu 610059China Institute of Subsurface Energy Systems Clausthal University of Technology38678 Clausthal ZellerfeldGermany Key Laboratory of Quaternary Chronology and Hydro-Environmental Evolution Institute of Hydrogeology and Environmental GeologyChina Geological SurveyShijiazhuang 050061China

The(ultra-)mafic mine tailings pond revealed a weathering discrepancy in the tailings profile,which provided a valuable analog to assess the role of carbonate and silicate weathering of the *** this study,drill-cores samples were selected from the Wanniangou V–Ti–Fe mine tailings pond(Sichuan province,China)to investigate the mineralogicand geochemical characteristics in the tailings *** results reveal(1)the tailings pond profile consist of upper and lower *** upper layer is composed of carbonate weathering(1.4%),which was formed in the initial stages of tailings exposure and represented a minimal weathering degree.(2)The lower layer was primarily observed at the aquifer zone of the tailings pond,and was consistent with 0.45%carbonate weathering and 48.4%silicate weathering.(3)The weathering discrepancy in the tailings profile could be due to the sulfide oxidation and aerobic/flowing aquifer,which facilitate the water-tailings *** tailings profile provides an analog to studying basalt weathering,as it spans both carbonate and silicate *** research reinforces the idea that silicate weathering is predominant in basaltic areas and plays a crucial role in regulating atmospheric CO_(2)(carbon dioxide)levels on Earth.

关键词： V–Ti–Fe mine Tailings pond profile Drill core Basalt weathering

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