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نتیجه جستجو - مدلسازی

تعداد مقالات یافته شده: 210
ردیف عنوان نوع
1 Generation of Accessible Sets in the Dynamical Modeling of Quantum Network Systems
تولید مجموعه‌های قابل دسترس در مدل‌سازی دینامیکی سیستم‌های شبکه کوانتومی-2022
In this article, we consider the dynamical modeling of a class of quantum network systems consisting of qubits, where information extraction is allowed by performing measurement on several selected qubits of the system. For a variety of applications, a state space model is a useful approach to modeling the system dynamics. To construct a state space model for a quantum network system, the major task is to find an accessible set containing all of the operators coupled to the measurement operators. This article focuses on the generation of a proper accessible set for a given system and measurement scheme. We provide analytic results on simplifying the process of generating accessible sets for systems with a time-independent Hamiltonian. Since the order of elements in the accessible set determines the form of state space matrices, guidance is provided to effectively arrange the ordering of elements in the state vector. Defining a system state according to the accessible set, one can develop a state space model with a special pattern inherited from the system structure. As a demonstration, we specifically consider a typical 1-D-chain system with several common measurements and employ the proposed method to determine its accessible set.
Index Terms: Accessible set | dynamical modeling | quantum network system | quantum system.
مقاله انگلیسی
2 Ontological Approach for Semantic Modelling of Malay Translated Qur’an
رویکرد هستی‌شناختی برای مدل‌سازی معنایی قرآن ترجمه‌شده مالایی-2022
This thesis contributes to the areas of ontology development and analysis, natural language processing (NLP), Information Retrieval (IR) and Language Resource and Corpus Development. Research in Natural Language Processing and semantic search for English has shown successful results for more than a decade. However, it is difficult to adapt those techniques to the Malay language, because its complex morphology and orthographic forms are very different from English. Moreover, limited resources and tools for computational linguistic analysis are available for Malay. In this thesis, we address those issues and challenges by proposing MyQOS,the Malay Qur’an Ontology System, a prototype ontology-based IR with semantics for representing and accessing a Malay translation of the Qur’an. This supports the development of a semantic search engine and a question answering system and provides a framework for storing and accessing a Malay language corpus and providing computational linguistics resources. The primary use of MyQOS in the current research is for creating and improving the quality and accuracy of the query mechanism to retrieve information embedded in the Malay text of the Qur’an translation. To demonstrate the feasibility of this approach, we describe a new architecture of morphological analysis for MyQOS and query algorithms based on MyQOS. Data analysis that consisted of two measures; precision and recall, where data was obtained from MyQOS Corpus conducted in three search engines. The precision and recall for semantic search are 0.8409 (84%) and 0.8043(80%), double the results of the question answer search which are 0.4971(50%) for precision and 0.6027 (60%) for recall. The semantic search gives high precision and high recall comparing the other two methods. This indicates that semantic search returns more relevant results than irrelevant ones. To conclude, this research is among research in the retrieval of the Qur’an texts in the Malay language that managed to outline state-of-the-art information retrieval system models. Thus, the use of MyQOS will help Malay readers to understand the Qur’an in better ways. Furthermore, the creation of a Malay language corpus and computational linguistics resources will benefit other researchers, especially in religious texts, morphological analysis and semantic modelling.
مقاله انگلیسی
3 A review and perspectives on predicting the performance and durability of electrical contacts in automotive applications
بررسی و دیدگاه‌هایی در مورد پیش‌بینی عملکرد و دوام کنتاکت‌های الکتریکی در کاربردهای خودرو-2021
This review reports the recent progress in predicting the performance and long-term durability of electrical connectors in the automotive industry. The review features a short introduction to electrical contacts as well as the validation process before product launch, followed by a study of fretting wear and the latest mathematical models describing this phenomenon. We discuss approaches to numerical modeling in the micro- and macro-scale, including the identification of the most promising research approaches to allow durability prediction of an electrical connector. Finally, we address some gaps in the research which require further investigation. This would allow further development of numerical models enabling the prediction of automotive connector durability with regard to its electrical and mechanical performance, and hence, the performance of the entire wire harness.
Keywords: Fretting | Modeling and simulation | Numerical modeling | Mechanics of materials | Electrical and electronic engineering | Modeling of degradation | LSR aging
مقاله انگلیسی
4 Construction of carbonate reservoir knowledge base and its application in fracture-cavity reservoir geological modeling
ساخت پایگاه دانش مخزن کربناته و کاربرد آن در مدلسازی زمین شناسی مخزن شکستگی-حفره ای-2021
To improve the efficiency and accuracy of carbonate reservoir research, a unified reservoir knowledge base linking geological knowledge management with reservoir research is proposed. The reservoir knowledge base serves high-quality analysis, evaluation, description and geological modeling of reservoirs. The knowledge framework is divided into three categories: technical service standard, technical research method and professional knowledge and cases related to geological objects. In order to build a knowledge base, first of all, it is necessary to form a knowledge classification system and knowledge description standards; secondly, to sort out theoretical understandings and various technical methods for different geologic objects and work out a technical service standard package according to the technical standard; thirdly, to collect typical outcrop and reservoir cases, constantly expand the content of the knowledge base through systematic extraction, sorting and saving, and construct professional knowledge about geological objects. Through the use of encyclopedia based collaborative editing architecture, knowledge construction and sharing can be realized. Geological objects and related attribute parameters can be automatically extracted by using natural language processing (NLP) technology, and outcrop data can be collected by using modern fine measurement technology, to enhance the efficiency of knowledge acquisition, extraction and sorting. In this paper, the geological modeling of fracture-cavity reservoir in the Tarim Basin is taken as an example to illustrate the construction of knowledge base of carbonate reservoir and its application in geological modeling of fracture-cavity carbonate reservoir.
keywords: knowledge management | reservoir knowledge base | fracture-cavity reservoir | geological modeling | carbonates | paleo-underground river system | Tahe oilfield | Tarim Basin
مقاله انگلیسی
5 Multi-objective optimization modelling of sustainable green supply chain in inventory and production management
مدلسازی چند هدفه بهینه سازی زنجیره تأمین سبز پایدار در مدیریت موجودی و تولید-2021
The ever increasing pressure to conserve the environment from global warming cannot be overemphasized. Emission from the inventory and production process contributes immensely to global warming and hence, the need to device a sustainable green inventory by the operational managers. In this paper, a multi-item multi-objective inventory model with back-ordered quantity incorporating green investment in order to save the environment is proposed. The model is formulated as a multi-objective fractional programming problem with four objectives: maximizing profit ratio to total back-ordered quantity, minimizing the holding cost in the system, minimizing total waste produced by the inventory system per cycle and minimizing the total penalty cost due to green investment. The constraints are included with budget limitation, space restrictions, a constraint on cost of ordering each item, environmental waste disposal restriction, cost of pollution control, electricity consumption cost during production and cost of greenhouse gas emission in the production process. The model effectiveness is illustrated numerically, and the solution obtained to give a useful suggestion to the decision-markers in the manufacturing sectors.
KEYWORDS: Multi-objective fractional programming | Fuzzy goal programming | Sustainable green supply chain | Inventory and production management
مقاله انگلیسی
6 Accounting for cross-immunity can improve forecast accuracy during influenza epidemics
حسابداری برای مصونیت متقابل می تواند دقت پیش بینی را در طول اپیدمی های آنفلوانزا بهبود بخشد-2021
Previous exposure to influenza viruses confers cross-immunity against future infections with related strains. However, this is not always accounted for explicitly in mathematical models used for forecasting during influenza outbreaks. We show that, if an influenza outbreak is due to a strain that is similar to one that has emerged previously, then accounting for cross-immunity explicitly can improve the accuracy of real-time forecasts. To do this, we consider two infectious disease outbreak forecasting models. In the first (the ‘‘1-group model’’), all individuals are assumed to be identical and cross-immunity is not accounted for. In the second (the ‘‘2-group model’’), individuals who have previously been infected by a related strain are assumed to be less likely to experience severe disease, and therefore recover more quickly, than immunologically naive individuals. We fit both models to estimated case notification data (including symptomatic individuals as well as laboratory-confirmed cases) from Japan from the 2009 H1N1 influenza pandemic, and then generate synthetic data for a future outbreak by assuming that the 2-group model represents the epidemiology of influenza infections more accurately. We use the 1-group model (as well as the 2-group model for comparison) to generate forecasts that would be obtained in real-time as the future outbreak is ongoing, using parameter values estimated from the 2009 epidemic as informative priors, motivated by the fact that without using prior information from 2009, the forecasts are highly uncertain. In the scenario that we consider, the 1-group model only produces accurate outbreak forecasts once the peak of the epidemic has passed, even when the values of important epidemiological parameters such as the lengths of the mean incubation and infectious periods are known exactly. As a result, it is necessary to use the more epidemiologically realistic 2-group model to generate accurate forecasts. Accounting for cross-immunity driven by exposures in previous outbreaks explicitly is expected to improve the accuracy of epidemiological modelling forecasts during influenza outbreaks.
keywords: مدلسازی ریاضی | پیش بینی آنفلوانزا | Real-timeForecast | مصونیت متقابل | 2009 H1N1 پاندمی | Mathematicalmodelling | Influenzaforecasting | Real-timeforecast | Cross-immunity | 2009H1N1pandemic
مقاله انگلیسی
7 چالش‌های احیای زنجیره‌ی تأمین در پی همه‌گیری کووید-19
سال انتشار: 2021 - تعداد صفحات فایل pdf انگلیسی: 14 - تعداد صفحات فایل doc فارسی: 46
همه‌گیری کرونا شکننده بودن زنجیره‌های تأمین جهانی در اثر کمبود مواد اولیه، اختلال در تولید و حمل و نقل، و فاصله‎گذاری اجتماعی را آشکار نمود. بایستی شرکت‌ها به دقت مشکلات مرتبط با احیا را پیش‌بینی نموده و راهبردهای مناسبی را برای اطمینان از بقای زنجیره‌های تأمین و کسب و کارهای خود تدوین نمایند. برای افزایش آگاهی از این مسائل، هدف پژوهش پیش رو، شناسایی و مدلسازی چالش‌های احیا در بستر صنعت پوشاک "دوخته‌فروش" بنگلادش است. روش آزمایش و آزمایشگاه ارزیابی و آزمون تصمیم‌گیری خاکستری مبتنی بر دلفی (DEMATEL) برای تحلیل داده‌ها استفاده شد. درحالیکه روش دلفی به شناسایی چالش‌های اصلی احیای زنجیره‌ی تأمین ناشی از تأثیرات همه‌گیری کووید-19 کمک می‌کند، رویکرد DEMATEL خاکستری به دسته‌بندی روابط علّی میان این چالش‌های کمک خواهد کرد. از بین 23 چالش احیای نهایی، 12 مورد، چالش‌های علّی هستند. یافته‌های این پژوهش می‌تواند به تصمیم‌گیرندگان در توسعه‌ی سیاست‌های راهبردی برای غلبه بر چالش‌های احیای در دوران پساکرونا کمک کند.
کلیدواژه ها: همه‌گیری کووید-19 | مدیریت زنجیره‎‌ی تأمین | چالش‌های احیا | روش دلفی | DEMATEL خاکستری.
مقاله ترجمه شده
8 Modeling the key factors influencing the reduction of food loss and waste in fresh produce supply chains
مدلسازی عوامل کلیدی موثر در کاهش اتلاف مواد غذایی و ضایعات موجود در زنجیره های تأمین محصولات تازه-2021
The purpose of this study is to develop a comprehensive framework by identifying and analyzing the key factors influencing the reduction of food loss and waste (FLW) in fresh produce supply chains (FPSCs) in developing countries, specifically India. This empirical study has identified eight influencing factors, representing the given context, from the literature (using content analysis) under the purview of management theories (namely, stakeholder theory, capabilities-based theory, and critical success factors theory) as well as data collected through semi-structured interviews from a group of selected experts. Further, Interpretive Structural Modeling (ISM) technique and Matriced’ Impacts Croise’s Multiplication Appliquee an un Classement (MICMAC) analysis are used as an integrated method to analyze the identified factors. Regulatory bodies and food policy along with market infrastructure are the most significant factors and have a high tendency to influence the reduction of FLW in FPSCs; therefore, require utmost consideration. The findings of this study are expected to enable managers and policy makers to uncover and understand the key factors. The insights from the findings will help in formulating policies and making strategic decisions regarding the reduction of FLW in FPSCs which will help in attaining sustainable development goals target on FLW.
Keywords: Food loss and waste | Fresh produce supply chain | India | Interpretive structural modeling | Sustainable development goals
مقاله انگلیسی
9 Multiscale modelling of granular materials in boundary value problems accounting for mesoscale mechanisms
مدل‌سازی چند مقیاسی مواد دانه‌ای در مسائل ارزش مرزی برای مکانیزم‌های مقیاس متوسط-2021
The proper solution of geotechnical boundary value problems requires robust constitutive models that can describe the mechanical behavior of geomaterials under various loading conditions, while also accounting as closely as possible for the different material scales of interest. This is even more relevant to granular media where the complexity of the mechanical behaviour is not limited to the nature of the contact law between grains, and instead originates from the multiplicity of contacts oriented along all the directions of the physical space to form distinctive mesostructures. This paper revisits the so-called H-model, which belongs to the broad family of micromechanical approaches whereby an intermediate scale (mesoscale) is explicitly introduced into the formulation. One great advantage of the model is that it can be extended by accounting for further multi-physical couplings, as for example the presence of capillary bridges between grains. This versatile model was imple- mented within an explicit finite difference based computational software (FLAC), and the present work dem- onstrates its ability to analyze engineering problems with a microstructural viewpoint, while also providing new insights in microstructural mechanisms of failure difficult to capture with standard phenomenological models.
keywords: مواد گرانول | یکسان سازی | رویکرد چند منظوره | نظریه چندگانه | ریز ساختار | مقیاس Mesoscopic | مدل سازی سازنده | مدل H | مشکلات ارزش مرزی | Granular material | Homogenization | Multiscale approach | Multislip theory | Microstructure | Mesoscopic scale | Constitutive modeling | H-model | Boundary value problems
مقاله انگلیسی
10 مدلسازی شیفت‌های کاری در پروژه‌های ساخت با استفاده از یک رویکرد مبتنی بر عامل برای به حداقل رساندن انتشار COVID19
سال انتشار: 2021 - تعداد صفحات فایل pdf انگلیسی: 10 - تعداد صفحات فایل doc فارسی: 25
گسترش COVID19 نحوه ارتباط ما با افراد دیگر و محیط ساخته‌مان را تغییر داده‌است، تغییر از حالت شخصی به فعالیت‌های عمدتا مجازی. با این حال، برخی از فعالیت‌ها عملا غیر ممکن هستند، مانند فعالیت‌های ساخت‌وساز. در نتیجه، صنعت ساخت‌وساز به شدت تحت‌تاثیر پاندمی ناشی از COVID19 قرار گرفته‌است. در پاسخ به اثرات پاندمی، بخش ساخت‌وساز باید جایگزین‌هایی را شناسایی کند که می‌تواند انتشار COVID19 را در میان کارگران در پروژه‌های ساخت‌وساز به حداقل برساند. یعنی، با اختصاص دادن تقریبا نیمی از کارگران درگیر در یک پروژه به شیفت شب، می توان متوسط تعداد کارگران سالم را در یک پروژه تا ۲۰ نفر افزایش داد. تعیین تاثیر جایگزین‌هایی که ممکن است گسترش COVID19 را در میان کارگران ساخت‌وساز کاهش دهد می‌تواند اجرای چنین جایگزین‌هایی را توسط مدیران ساخت‌وساز تشویق کند.
کلمات کلیدی: ساخت | COVID19 | شیفت‌های کاری | مدل‌سازی مبتنی بر عامل
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