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Optimizing life cycle sustainability based on municipal solid waste streams and treatment potentials

Environment systems and Decisions 2024年第4期44卷 887-905页

作者： Aleisa, Esra Al-Jarallah, Rawa Industrial and Management Systems Engineering Department College of Engineering and Petroleum Kuwait University Safat 13060 Kuwait Civil Engineering Department College of Engineering and Petroleum Kuwait University Safat 13060 Kuwait

This study applies multicriteria mathematical modeling to optimize municipal solid waste (MSW) management across a three bottom-line (BL) framework: environmental, social and economic. The interrelationships and the ripple secondary impacts among the three BLs are examined systematically using an augmented simplex lattice mixture (ASLM) method. Detailed waste and waste treatments, including pyrolysis (PY), anaerobic digestion (AD), animal feed (AF), composting (CP), recycling (RE), incineration (INC) and landfilling (LF), are constructed based on waste stream fractions and treatment allowable limits. The environmental BL is assessed using life cycle assessment (LCA). The economic BL is determined by calculating the per ton capital recovery with return, and the social bottom line is assessed using the analytic hierarchy process (AHP). The three bottom lines are optimized through a mathematical model using CPLEX solver. The results indicate that CP abates 973 kgCO₂eq/t compared to 61.8 kgCO₂eq/t from AD and 28.3 kgCO₂eq/t from AF. CP generates $23.5/t despite its low social desirability. Plastic waste PY credits ethylene by 364 kg/t, however, it costs $226.7/t despite the subtraction of credited energy and recovered byproducts. Metal RE carbon and water footprints are −236 kgCO₂eq/t and 268 m³/t, respectively. AF is the second-best economic scenario after metal RE as it generates up to $122.6/t in profit. AF production scores are second highest within the social BL after plastic PY;however, the supporting legislation sub-indicator is low. The ASLM support policy that assigns 66% to the environmental BL and 16.7% to the economic and social BL to achieve carbon neutrality within the MSW sector. © The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2024.

关键词： Economic assessment Kuwait Life cycle assessment (LCA) Mathematical modeling Municipal solid waste (MSW) Sensitivity Social assessment

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SeRTS: Self-Rewarding Tree Search for Biomedical Retrieval-Augmented Generation

SeRTS: Self-Rewarding Tree Search for Biomedical Retrieval-A...

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2024 Conference on Empirical Methods in Natural Language Processing, EMNLP 2024

作者： Hu, Minda Zong, Licheng Wang, Hongru Zhou, Jingyan Li, Jingjing Gao, Yichen Wong, Kam-Fai Li, Yu King, Irwin Department of Computer Science and Engineering Hong Kong Department of Systems Engineering and Engineering Management The Chinese University of Hong Kong Hong Kong

ISBN: (纸本)9798891761681

Large Language Models (LLMs) have shown great potential in the biomedical domain with the advancement of retrieval-augmented generation (RAG). However, existing retrieval-augmented approaches face challenges in addressing diverse queries and documents, particularly for medical knowledge queries, resulting in sub-optimal performance. To address these limitations, we propose a novel plug- and-play LLM-based retrieval method called Self-Rewarding Tree Search (SeRTS) based on Monte Carlo Tree Search (MCTS) and a self-rewarding paradigm. By combining the reasoning capabilities of LLMs with the effectiveness of tree search, SeRTS boosts the zero-shot performance of retrieving high-quality and informative results for RAG. We further enhance retrieval performance by fine-tuning LLMs with Proximal Policy Optimization (PPO) objectives using the trajectories collected by SeRTS as feedback. Controlled experiments using the BioASQ-QA dataset with GPT-3.5-Turbo and LLama2-7b demonstrate that our method significantly improves the performance of the BM25 retriever and surpasses the strong baseline of self-reflection in both efficiency and scalability. Moreover, SeRTS generates higher-quality feedback for PPO training than self-reflection. Our proposed method effectively adapts LLMs to document retrieval tasks, enhancing their ability to retrieve highly relevant documents for RAG in the context of medical knowledge queries. This work presents a significant step forward in leveraging LLMs for accurate and comprehensive biomedical question answering. © 2024 Association for Computational Linguistics.

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A Study on Customer Utility Based on Differences in Stage Configuration and Ticket Sales Methods

A Study on Customer Utility Based on Differences in Stage Co...

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2024 IEEE International Conference on Industrial engineering and engineering management, IEEM 2024

作者： Mototaka, Katsuki Hasuike, Takashi Department of Industrial and Management Systems Engineering Waseda University Tokyo Japan

ISBN: (纸本)9798350386097

Stage configuration and ticket sales methods are crucial elements that influence the customer experience of live entertainment. This study uses social simulations considering both stage configuration and ticket sales methods for live entertainment and assesses their impact on customer utility. Five stage configurations are examined (rectangular, convex, two-stage, three-stage, and circular configurations), with each seat’s value defined and calculated as the seat utility value. Based on these values, simulations are conducted for three ticket sales methods (uniform pricing, multi-seat pricing, and auction sales). The results show that the circular stage configuration is the optimal layout for maximizing customer utility across all three sales methods, while the frequently used rectangular stage configuration has the lowest provided value. Additionally, the combination of the convex stage configuration with ticket sales considering agents’ winning history and the two-stage configuration with auction sales are both effective and suitable. © 2024 IEEE.

关键词： Sales

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Evaluating Installation Water Security Needs

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Military Engineer 2024年第752期116卷 51-52页

作者： Berg, Michael Weeks, Daniel Chini, Christopher Department of Systems Engineering & Management Air Force Institute of Technology United States Earth Systems Predictability & Resiliency Group Pacific Northwest National Laboratory United States

Mountain Home AFB, located in southwestern Idaho, faced a water scarcity concern due to the diversion of water from a critical declining aquifer. This challenge spurred an enterprise-wide assessment of overall installation water security risk, an undertaking that was then codified by the inclusion of base water security and management in the National Defense Authorization Act.

关键词： Groundwater resources

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Tube-based coalitional model predictive control for tracking 63

Tube-based coalitional model predictive control for tracking

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63rd IEEE Conference on Decision and Control, CDC 2024

作者： Sanchez-Amores, A. Ferramosca, A. Maestre, J.M. Camacho, E.F. University of Seville Department of Systems and Automation Engineering Spain University of Bergamo Information and Production Engineering Department of Management Italy

ISBN: (纸本)9798350316339

This work explores a coalitional control approach for input-coupled multi-agent systems to robustly track changing setpoints. In this partially cooperative framework, agents can share a public portion of their input with neighboring agents while keeping the remainder private. Negotiations over the bounds defining the public and private input sets can be triggered on demand. Additionally, coupling disturbances are addressed using a tube-based approach, guiding the system towards desired target points. The effectiveness of the proposed approach is demonstrated through its application to a simulated eight-input coupled tank benchmark. © 2024 IEEE.

关键词： Multi agent systems

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A Machine Learning Approach to Detect Lung Nodules Using Reinforcement Learning Based on Imbalanced Classification

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SN Computer Science 2024年第4期5卷 370页

作者： Rezaei, Seyed Reza Ahmadi, Abbas Department of Industrial Engineering and Management Systems Amirkabir University of Technology (Tehran Polytechnic) Tehran Iran

Lung cancer is one of the fatal diseases affecting millions of people globally. Importantly, accuracy and rapid lung nodules detection on CT images are significant challenges. Doctors and radiologists' manual detection of lung nodules have low efficiency due to the variety of size, shape, and nodule’s location. Approaches based on machine learning play a fundamental and important role in the integration and analysis of these large and complex data sets. Considering the different viewpoints of learning methods and diverse lung cancer data, machine learning is an attractive and interesting method for researchers. This paper proposes a novel machine-learning approach to detect lung nodules using reinforcement learning based on imbalanced classification. Due to many healthy data, the ANN classifier tends towards this class rather than the suspicious one. To avoid this problem, we apply reinforcement learning to learn ANN parameters. The results obtained from our proposed model on the LIDC-IDRI data set showed better results than state of the arts on standard performance metrics such as IOU and HD. Also, according to accuracy metrics proposed method have the highest value of 94.91, compared to the previous best methods. Compared with advanced approaches, experimental results on the LIDC dataset indicated that the proposed model could detect various nodules and achieve the highest accuracy at the lowest time. Due to the nature of imbalanced data on most cancers, the proposed method can be adapted to other cancers. © The Author(s), under exclusive licence to Springer Nature Singapore Pte Ltd 2024.

关键词： CT images Imbalanced classification Lung cancer Machine learning approach Reinforcement learning

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Factorial design analytics on effects of material parameter uncertainties in multiphysics modeling of additive manufacturing

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npj Computational Materials 2023年第1期9卷 1848-1865页

作者： Amanda Giam Fan Chen Jiaxiang Cai Wentao Yan Integrative Sciences and Engineering Programme NUS Graduate SchoolNational University of SingaporeSingapore 119077Singapore Department of Mechanical Engineering National University of SingaporeSingapore 117575Singapore Department of Industrial Systems Engineering and Management National University of SingaporeSingapore 117576Singapore

A bottleneck in Laser Powder Bed Fusion(L-PBF)metal additive manufacturing(AM)is the quality inconsistency of its *** address this issue without costly experimentation,computational multi-physics modeling has been used,but the effectiveness is limited by parameter uncertainties and their *** propose a full factorial design and variable selection approach for the analytics of main and interaction effects arising from material parameter uncertainties in multi-physics *** is collected from high-fidelity thermal-fluid simulations based on a 2-level full factorial design for 5 selected material *** physical phenomena of the L-PBF process are analyzed to extract physics-based domain knowledge,which are used to establish a validation checkpoint for our *** data visualization with half-normal probability plots,interaction plots and standard deviation plots,is used to assess if the checkpoint is being *** then apply the combination of best subset selection and the LASSO method on multiple linear regression models for comprehensive variable *** yield statistically and phyiscally validated findings with practical implications,emphasizing the importance of parameter interactions under uncertainty,and their relation to the underlying physics of L-PBF.

关键词： parameter additive analytic

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Resilience indices from a family of recovery functions

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Fundamental Research 2024年第1期4卷 13-20页

作者： Loon Ching Tang Lijuan Shen Department of Industrial Systems Engineering and Management National University of Singapore117576 Singapore ETH Zurich Future Resilient SystemsSingapore-ETH Centre138602 Singapore

Defining and measuring resilience using a unified framework has been a topic of intense *** article presents a perspective on how resilience could be quantitatively assessed through a set of *** starts with a brief explanation of resilience in the context of supply chain and a quick summary of existing quantitative measures of *** then discusses how resilience could be quantified in a constructive manner so that the resulting metrics are representative of the performance throughout the system's life *** particular,it is proposed that resilience should be evaluated according to different time periods,***,during and after a disruption has *** dimensions of resilience,namely reliability,robustness,recovery and reconfigurability,can then be used to make up a set of indices for *** numerical illustration,these indices are computed based on recovery data arising from Hurricane Sandy in October ***,it is postulated that resilience will be the performance metric that complements productivity and sustainability as the third pillar for measuring success of organizations,and in turn,that of sovereign countries in their quests for developing smart cities.

关键词： systems resilience Recovery function Recovery index Robustness index Reconfigurability

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A revenue-based decision-making approach for evaluating modular product release plans under resource constraints

A revenue-based decision-making approach for evaluating modu...

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作者： Adegbola, Adewole Allada, Venkat Engineering Management and Systems Engineering Department Missouri University of Science and Technology RollaMO65401 United States

This study introduces the module substitution concept to develop an approach for assessing different strategies for modular product release in a technology-receptive market. We consider a situation where product variants emerge from modules which have varying modular relationships, and each module is defined by specific attributes. The statistical program evaluation and review technique (statistical PERT) was then adopted to address the uncertainties associated with module attributes. A practical example involving the development of modules, product families and their product variants is used to demonstrate the applicability of the approach in which feasible strategies that satisfy the development resource constraint were identified. We then introduced a substitute module to yield a product variant and re-evaluated the strategies. The results obtained shows that the approach is instrumental in assessing various alternatives based on launch timings and revenue generation and can be adopted by managers in deciding on the appropriate product release plan. Copyright © 2024 Inderscience Enterprises Ltd.

关键词： Decision making

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Shifting, Not Shrinking? Exploring Labor Roles in Traditional and Automated Taxi Services

Shifting, Not Shrinking? Exploring Labor Roles in Traditiona...

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IISE Annual Conference and Expo 2023

作者： Kaplan, Leah Szajnfarber, Zoe Helveston, John Paul Department of Engineering Management and Systems Engineering The George Washington University United States

ISBN: (纸本)9781713877851

systems engineering has often concerned itself with how operator and customer roles change when systems change. In the context of automated vehicles (AVs), it has been assumed that operators will be removed from the system, but new insights reveal that the role of operators (typically thought of as drivers) has been transformed, not eliminated. In this study, we identify how taxi companies, Transportation Network Companies (TNCs, e.g., Uber and Lyft), and AV companies use varying organizational architectures to achieve required functions, and we explore how these architectures might change with the emergence of automated taxi services. Drawing on field observations, detailed ethnographic studies, archival documents, and semi-structured interviews with AV technical and operational experts, we identify and detail required functions for these services. Preliminary results reveal that the structures of commercial AV taxi services more closely parallel traditional taxi organizations rather than current TNCs based on their capital cost and human labor requirements. Future research will explore short and long-term development pathways for AV systems and their associated structural and functional requirements. While the structures of these AV companies will continue to develop alongside the automation technologies, early explorations of AV organizations can promote dialogue about regulations that might direct emerging AV services toward more desirable service and labor outcomes. © IISE and Expo *** rights reserved.

关键词： Taxicabs

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