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37th IEEE International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology systems, DFT 2024

作者： Zancan, Valentina Decuzzi, Filomena Furano, Gianluca Canese, Lorenzo Politecnico di Milano Department of Management Engineering Milan Italy European Space Agency Data Systems Division Noordwijk Netherlands University of Rome Tor Vergata Department of Electronic Engineering Rome Italy

ISBN: (纸本)9798350366884

This paper explores the design principles for creating dependable systems in critical space applications, focusing on new technologies like autonomous systems and Artificial Intelligence (AI). Although AI holds great promise, its lack of transparency ('black box' nature) challenges the traditional 'safety first' approach in space design. We emphasize the importance of a thorough requirements identification process. Using a case study from the European Space Agency (ESA), we show how institutional policies and user needs are translated into a Mission Requirements Document (MRD) for the Copernicus programme's Sentinel missions. This approach ensures that user needs are met throughout the development process. The case study highlights the need for well-defined dependability scenarios, especially for systems using new technologies like AI. We acknowledge the changing commercial space landscape driven by AI and stress the importance of unique dependability scenarios for functions such as low-latency security Earth Observation (EO). Defining these scenarios is crucial for the safe and reliable operation of new AI-based space systems. © 2024 IEEE.

关键词： Space applications

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Enhancement and Optimization of the Propulsion System Modules of Unmanned Aerial Vehicles

Enhancement and Optimization of the Propulsion System Module...

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2024 Asia Conference on Electronic Technology, ACET 2024

作者： Shiau, Y.R. Fang, J. Huang, Y.C. Department of Industrial Engineering and Systems Management Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung Taiwan Department of Aerospace and Systems Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung Taiwan Ph.D. Program of Mechanical and Aeronautical Engineering Feng Chia University No. 100 Wenhwa Rd. Seatwen Taichung Taiwan

ISBN: (纸本)9781510681361

Unmanned aerial vehicles (UAVs) are widely used in various industries. The present study focused on the optimization of the configuration of the vertical electric ducted fans (EDFs) of UAVs to enhance the vertical takeoff and landing (VTOL) performance of UAVs, improve the configuration of their propulsion system, address the potential risk of exposed propellers, and reduce the space required between the fluid channel and the outlet in horizontal EDFs. A UAV aircraft module with a vertical EDF configuration was designed, following which structural analysis and flow field analysis were conducted using Ansys. The results of these analyses indicate that the overall flow of the designed module is smooth and stable without vortex generation and that the inlet and outlet air velocity performance of this module is excellent. The lift parameters of the rotor groups of the designed module are identical to each other;thus, the flight stability of the UAV in the air can be maintained, and the requirements for optimized design can be met. This study makes two contributions to the literature. First, the structural module of a vertical EDF propulsion system was proposed with an encapsulated impeller set hidden inside the vehicle structure to reduce the risk of propeller exposure. Second, the configuration of vertical EDF compared to the horizontal configuration shortens the airflow channel, which helps to stabilize the wind speed at the outlet, thereby increasing lifting capacity and propulsion efficiency. © 2024 SPIE.

关键词： Propellers

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Life Cycle management in Oil&Gas Products Industry 17

Life Cycle Management in Oil&Gas Products Industry

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17th International Conference on engineering of Modern Electric systems, EMES 2023

作者： Magdoiu, Liliana Doina Caciora, Simona Veronica Abrudan Pacala, Anca Gamcova, Maria University of Oradea Control Systems Engineering and Management Department Oradea Romania Technical University of Kosice Faculty of Electrical Engineering and Informatics Kosice Slovakia

ISBN: (纸本)9798350310634

The life cycle of a petroleum product reflects the evolution of its sales volume over time and represents the interval between its introduction on the market and its definitive disappearance from the commodity exchange arena. During the life cycle of a petroleum product, the company marketing it will keep on reformulating the adopted marketing strategies, as determined by variable conditions and new challenges on the side of the competition, along with the changes in customers' interests and their requirements in relation to the product;therefore, appropriate marketing strategies must be developed for each stage in the life cycle of the petroleum product in order to increase its marketing profitability, even though its existence is limited over time. © 2023 IEEE.

关键词： Life cycle

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Cloud-integrated cyber–physical systems: Reliability, performance and power consumption with shared-servers and parallelized services

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Frontiers of engineering management 2025年第2期12卷 272-290页

作者： Shuyi MA Jin LI Jianping LI Min XIE School of Management Xi’an Jiaotong UniversityXi’an 710049China Department of Systems Engineering City University of Hong KongHong KongChina School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China

Cloud systems, which are typical cyber–physical systems, consist of physical nodes and virtualized facilities that collaborate to fulfill cloud computing services. The advent of virtualization technology engenders resource sharing and service parallelism in cloud services, introducing novel challenges to system modeling. In this study, we construct a systematic model that concurrently evaluates system reliability, performance, and power consumption (PC) while delineating cloud service disruptions arising from random hardware and software failures. Initially, we depict system states using a birth–death process that accommodates resource sharing and service parallelism. Given the relatively concise service duration and regular failure distributions, we employ transient-state transition probabilities instead of steady-state analysis. The birth–death process effectively links system reliability, performance, and PC through service durations governed by service assignment decisions and failure/repair distributions. Subsequently, we devise a multistage sample path randomization method to estimate system metrics and other factors related to service availability. The findings highlight that the trade-off between performance and PC, under the umbrella of reliability guarantees, hinges on the equilibrium between service duration and unit power. To further delve into the subject, we formulate optimization models for service assignment and juxtapose optimal decisions under varying availability scenarios, workload levels, and service attributes. Numerical results indicate that service parallelism can improve performance and conserve energy when the workload remains moderate. However, as the workload escalates, the repercussions of resource sharing-induced performance loss become more pronounced due to resource capacity limitations. In cases where system availability is constrained, resource sharing should be approached cautiously to ensure adherence to deadline requirements. Thi

关键词： cloud service modeling transient downtime analysis resource sharing service parallelism

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MODELING OPERATIONAL CONTROL IN DISCRETE-EVENT LOGISTICS systems AND THEIR DIGITAL TWINS

MODELING OPERATIONAL CONTROL IN DISCRETE-EVENT LOGISTICS SYS...

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2024 Winter Simulation Conference, WSC 2024

作者： Ragazzini, Lorenzo McGinnis, Leon F. Negri, Elisa Macchi, Marco Department of Management Economics and Industrial Engineering Politecnico di Milano MI Milano Italy Stewart School of Industrial and Systems Engineering Georgia Institute of Technology AtlantaGA United States

ISBN: (纸本)9798331534202

In manufacturing systems, operational control plays a crucial role in ensuring proper functioning and efficiency. Traditional approaches to modeling operational controllers in simulation often suffer both from inability to properly represent decisions as they are made in real systems and from rigidity and lack of adaptability to changing system requirements and configuration during their design. This paper explores a novel approach to designing and implementing operational controllers in discrete-event simulation based on the introduction of control policies as standardized structures that explicitly integrate operational control decision-making into DES models. Standard structures allow for easy integration with optimization tools, facilitating the exploration of different control policies during the design of a new system. The use of control policies also has important implications for the development of digital twins of manufacturing systems, as it helps align the way systems control is designed with the control of real systems. © 2024 IEEE.

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Developing a cost-efficient dual sampling system for lot disposition by considering process yield and quality loss

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Quality engineering 2023年第2期35卷 267-278页

作者： Liu, Shih-Wen Wang, Zih-Huei Wang, To-Cheng College of Management National Chin-Yi University of Technology Taichung Taiwan Department of Industrial Engineering and Systems Management Feng Chia University Taichung Taiwan Department of Aviation Management Republic of China Air Force Academy Kaohsiung Taiwan

In the past few decades, various sampling strategies have been developed for different perspectives or occasions to benefit from cost reduction or time-saving when one performs lot disposition, particularly for those inspected items or expensive procedures. The quick switching sampling (QSS) system has been important in examining fewer samples under the same quality requirements and was designed with a dually flexible mechanism for varied qualities. However, most related studies considered only a fixed switching policy either critical value or sample-sized tightenings, which might neglect the collective effect of two types of QSS systems. In this study, we integrate two variables QSS (VQSS) systems in a generalized form, known as integrated VQSS (IVQSS), based on the Cpmk index, a non-scale process performance indicator considering centering, variation, and quality loss simultaneously to accommodate advantages of two individual systems. The operating characteristic function is derived using the Markov Chain theory. Furthermore, we developed a mathematical model to minimize the average sample number and limit two acceptable sampling risks under desirable submitted quality levels. The plan parameters are obtained for making a reliable judgment on submissions by solving this optimization problem. Finally, to illustrate the practicability of the proposed method, we demonstrated a numerical application obtained from a solar panel industry and provided the solved plan parameters under commonly used conditions for convenient use. © 2022 Taylor & Francis Group, LLC.

关键词： Cost reduction

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BnGraphemizer: A Grapheme-based Tokenizer for Bengali Handwritten Text Recognition 9

BnGraphemizer: A Grapheme-based Tokenizer for Bengali Handwr...

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9th IEEE International Women in engineering (WIE) Conference on Electrical and Computer engineering, WIECON-ECE 2023

作者： Basher, Mohammad Jahid Ibna Noor, Mohammad Raghib Afroze, Sadia Ahmed, Ikbal Hoque, Mohammed Moshiul Chittagong University of Engineering & Technology Department of Computer Science and Engineering Chittagong Bangladesh University of Dhaka Department of Management Information Systems Dhaka Bangladesh CCN University of Engineering & Technology Computer Science and Engineering Cumilla Bangladesh

ISBN: (纸本)9798350319651

Bengali Handwritten Text Recognition (HTR) is a challenging task due to the text's cursive disposition and significant variations in the graphemic unit, the smallest written unit in alphasyllabary languages. These graphemic units, or simply graphemes, may consist of multiple characters and diacritics, and the order of characters or diacritics between textual and visual representations is only sometimes preserved. Moreover, Bengali conjunct characters, a subset of the graphemes, often have unique visual representations vastly different from the characters they comprise. Because of these inherent characteristics, a character-based tokenizer fails to tokenize the label text appropriately for BHTR in a supervised setting, making it challenging to adapt the existing sequence-to-sequence frameworks often used for Handwritten Text Recog-nition (HTR). To address this, this paper proposes a trie- based text tokenizer (called BnGraphemizer) that allows one to tokenize text into a set of graphemes instead of characters. Experimental investigations show that the BnGraphemizer-based BHTR system performs better regarding higher Word Recognition Rate (WRR) than its character-based counterpart in two of three Bengali handwritten datasets. © 2023 IEEE.

关键词： Character recognition

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Target-Oriented Regret Minimization for Satisficing Monopolists 19th

Target-Oriented Regret Minimization for Satisficing Monopol...

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19th InternationalConference on Web and Internet Economics, WINE 2023

作者： Rujeerapaiboon, Napat Wei, Yize Xue, Yilin Department of Industrial Systems Engineering and Management National University of Singapore Singapore Singapore Department of Computer Science National University of Singapore Singapore Singapore

ISBN: (纸本)9783031489730

We study a robust monopoly pricing problem where a seller aspires to sell an item to a buyer. We assume that the seller, unaware of the buyer’s willingness to pay, ambitiously optimizes over a space of all individually rational and incentive compatible mechanisms with a regret-type objective criterion. We particularly adopt a robust satisficing approach, which has been touted as a promising alternative of robust optimization, and aim at minimizing the excess regret above the predetermined target level. We interpret our pricing problem both probabilistically and distributionally robustly, and we analytically show that the optimal mechanism involves the seller offering a menu of lotteries that charges a buyer-dependent participation fee and allocates the item with a buyer-dependent probability. Then, we consider two additional variants of the problem where the seller restricts her attention to a class of only deterministic posted price mechanisms and where the seller is relieved from specifying the target regret in advance. Finally, we determine a randomized posted price mechanism that is readily implementable and equivalent to the optimal mechanism, compute its statistics, and quantify the strength of the entailed randomization. Besides, we compare the proposed mechanism with a robust benchmark and numerically find that the former is predominantly superior to the latter in terms of the expected regret and the expected revenue especially when the coefficient of variation of the buyer’s value is under a hundred percent. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Machine design

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Metaverse for Public Welfare and the United Nations Sustainable Development Goals

Metaverse for Public Welfare and the United Nations Sustaina...

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2022 International Conference on Cloud Computing, Big Data and Internet of Things, 3CBIT 2022

作者： Umar, Amjad Harrisburg University Information Systems Engineering & Management Program Harrisburg United States

ISBN: (纸本)9781665492256

Metaverse is extremely popular at present in the gaming industry but can it accelerate the advancement of public services as defined by the United Nations Sustainable Development Goals (UN SDGs)? In particular, can metaverse provide any value to developing nations and how can the challenges and risks introduced by the metaverse be addressed through govrnment regulations and policies? This paper presents a systematic analysis of metaverse and utilizes the United Nations SDGs as a metric to explore public welfare aspects of metaverse. A digital transformation Lab is presented for rapid deployment and experimentation with metaverse. © 2022 IEEE.

关键词： Sustainable development

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Improved Divide-and-Conquer Approach to Abstractive Summarization of Scientific Papers 4

Improved Divide-and-Conquer Approach to Abstractive Summariz...

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4th International Conference on Natural Language Processing, ICNLP 2022

作者： Shen, Xin Lam, Wai The Chinese University of Hong Kong Department of Systems Engineering and Engineering Management Hong Kong

ISBN: (数字)9781665495448

ISBN: (纸本)9781665495448

Recently, a simple and effective method called Divide ANd ConquER (DANCER) is proposed for automated abstractive summarization of scientific papers. However, we point out that DANCER still has several weaknesses. The most prominent one is that DANCER relies on ROUGE tool for the Section-to-Summary (SEC2SuMM) alignment. We address the weaknesses and propose a novel framework to improve DANCER. Our method includes a delicate training objective, which learns the SEC2SuMM alignment, and the section-level summarizer in a joint way. We investigate our framework on two publicly available scientific paper summarization benchmarks: PubMed and arXiv. Our method achieves significant improvements over DANCER and several competitive baselines. © 2022 IEEE.

关键词： Alignment

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