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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 |
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توسعهی پایدار محیط کسب و کار در شهرهای هوشمند: یک چارچوب سلسلهمراتبی
سال انتشار: 2020 - تعداد صفحات فایل pdf انگلیسی: 23 - تعداد صفحات فایل doc فارسی: 33 هدف – هدف این مقاله بررسی چارچوب سلسلهمراتبی توسعهی پایدار برای محیط کسب و کار در شهرهای هوشمند است. با اینحال بایستی این چارچوب سلسلهمراتبی، ویژگیهای غیرضروری و روابط داخلی مابین معیارهای دربرگیرندهی تفاوت بین شهرهای هوشمند و شهرهای معمولی را در نظر بگیرد.
طراحی / روششناسی / رویه – از این رو، نظریهی مجموعهی فازی برای غربالگری ویژگیهای غیرضروری استفاده شد، روش آزمون تصمیمگیری و آزمایشگاه ارزیابی (DEMATEL) برای مدیریت روابط داخلی پیچیده مابین جنبهها و ویژگیهای مختلف به کار گرفته شد، و مدلسازی ساختاری تفسیری (ISM) برای تقسیمبندی سلسلهمراتب و ایجاد یک چارچوب نظری سلسلهمراتبی استفاده شد. نهایتاً این پژوهش در ایجاد یک چارچوب سلسلهمراتبی پایدار برای محیط کسب و کار در شهرهای هوشمند کاربرد دارد. یافتهها – نتایج نشان میدهد مشکلات اجتماعی متداول هنوز هم نقش مهمی در توسعهی محیط کسب و کار در شهرهای هوشمند دارند، ممکن است فرصتهای هوشمند جدیدی کشف شوند، اما اینها توسط عوامل اجتماعی متداول محدود میشوند، مانند گذشته، اقتصاد، ویژگی اصلی محیط کسب و کار است و موانعی بر سر راه حل و فصل مشکلات اجتماعی با کمک فناوریهای هوشمند وجود دارد. اصالت / ارزش – هدف از این چارچوب سلسلهمراتبی نظری، هدایت شهرهای هوشمند به سوی توسعهی پایدار است. این مقاله ایجاد یک محیط کسب و کار قابل پیشبینی با ارتقای بازدهی اجرایی، شفافیت، پویایی اجتماعی و خدمات زیرساختی و پرورش فرصتهای جدید کسب و کار با کمک فناوری هوشمند را نیز ارائه میدهد. کلیدواژه ها: تصمیمگیری | توسعهی پایدار | فناوری اطلاعات | سیستمهای کسب و کار نوع مقاله – مقالهی پژوهشی |
مقاله ترجمه شده |
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Four forces of supply chain social sustainability adoption in emerging economies
چهار نیروی پذیرش ماندگاری اجتماعی زنجیره تامین در اقتصادهای نوظهور-2018 Despite the growing stakeholder awareness on social sustainability issues, little is known about what influences firms to adopt social sustainability in their supply chain management practices and the benefits gained from such efforts. This is especially true for emerging economies in Asia and Southwestern Europe, where the social norms differ significantly. Building on stakeholders and institutional perspectives, we address the issue by exploring how pressures from customers, sustainability culture, government, and external stakeholders act as primary constituents of the firm in determining the extent to which firm consider supply chain social sustainability adoption in emerging economies. Further, we explore how such social sustainability adoption relates to the firm suppliers social performance, the buyers operational performance and the buying firms social reputation. We test the hypothesized model empirically using data from 244 Indian and 126 Portuguese firms. Our results are consistent with the hypothesized model; all factors show significant influence and positive links with the firms benefits.
keywords: Social sustainability |Emerging economy |Sustainability |Institutional mechanisms |Structural equation modeling |
مقاله انگلیسی |
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Agile manufacturing relationship building with TQM, JIT, and firm performance: An exploratory study in apparel export industry of Pakistan
ایجاد رابطه ساخت زیرکانه با مدیریت کل کیفیت، به موقع بودن و عملکرد شرکت: یک مطالعه توضیحی در صنعت صادرات پوشاک پاکستان-2018 Recent research on Agile Manufacturing (AM) has examined its relationship with Total Quality Management (TQM), Just in Time (JIT), and different levels of firm performance. Mixed results have been reported, probably due to non-availability of well validated AM constructs. This research develops a 3-stage model and examines AMs direct and/or indirect relationship with common infrastructures, TQM, and JIT and its effects on different levels of firm performance in the context of the Pakistani industrial sectors, specifically the apparel export industry. Data is collected from 248 Pakistani apparel export firms and the model is estimated using structural equation modelling. The results indicate that common (internal) infrastructure and TQM has a positive relationship with AM specifically in the apparel export firms in a third world economy where the industrial sector is in a nascent state. Whereas, JIT relationship is positively mediated through external infrastructure, TQM and JIT did not seem to contribute directly in operational performance. However, this relationship is significant when it is mediated through AM. Market performance positively mediates the relationship between operational performance and financial performance of the firm. The implications of the findings for researchers and practitioners, looking at the industrial sectors in the developing world, are discussed and research directions offered.
keywords: Agile manufacturing (AM) |Total quality management (TQM) |Just-in-time (JIT) |Common infrastructure |Firm performance |Structural equation modelling (SEM) |
مقاله انگلیسی |
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The lean and resilient management of the supply chain and its impact on performance
مدیرت زنجیره تامین متکی و برجهنده و تاثیر آن روی عملکرد-2018 The relationship between lean management and resilience in the supply chain, whether negative or positive, is still not clear from the existing literature. This paper aims to investigate the relationship and links between lean and resilient supply chain (SC) practices and their impact on SC performance. To achieve this objective, the aerospace manufacturing sector (AMS) is chosen as the study sector because of the importance of both paradigms. Interpretive Structural Modeling (ISM) approach is used in order to identify linkages among various lean and resilience practices and SC performance metrics through a single systemic framework. ISM is an interactive learning process based on graph theory where experts knowledge is extracted and converted into a powerful well-structured model. For that purpose, a heterogeneous panel of experts in the AMS was formed, providing a complete view of all SC levels in the sector. The final ISM model revealed that lean SC practices act as drivers for resilient SC practices, since implementing the former in isolation could lead to a more vulnerable SC. The findings also show that lean SC practices lead to a higher performance improvement than resilient SC practices. This is due to the fact that resilient SC practices do not exert influence over all SC performance metrics as it occurs with lean SC practices. In addition, several managerial implications regarding the most convenient practices in terms of the companys objectives are drawn from this study.
keywords: Lean supply chain management |Resilient supply chain management |Interpretive structural modeling |Aerospace manugacturing sector |
مقاله انگلیسی |
6 |
Reflective versus formative confusion in SEM based tourism research: A critical comment
گیج شدگی انعکاسی دربرابر تشکیلی در تحقیقات گردشگری مبتنی بر SEM: یک نظر بحرانی-2018 The aim of this note is to raise awareness about the problem of measurement misspecification in tourism research with reference to studies that employ structural equations modeling. More precisely, this note describes possible instances when the measurement mode has been wrongly specified as reflective, although employed indicators/measures are formative by their nature. To assist future tourism research based on latent variable modeling, this commentary provides pragmatic advice and points to some of the key works from the wider marketing and management literature.
keywords: Formative |Reflective |Measurement mode |Misspecifications |Structural equations modeling |
مقاله انگلیسی |
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زمان آن فرا رسیده است: به سوی تخمین بیزی SEM در تحقیقات گردشگری
سال انتشار: 2018 - تعداد صفحات فایل pdf انگلیسی: 12 - تعداد صفحات فایل doc فارسی: 39 با اینکه درحال حاضر دیدگاه مدلسازی ساختاری معادله ای (SEM) بیزی توجه زیادی را در منابع علمی جلب کرده است، اما مطالعات گردشگری هنوزهم برای تخمین SEM به شدت روی دیدگاه مبتنی بر هم – پراکنش تکیه می کنند. مجله زیفور و اوسوالد (2013) در یک شماره ویژه اختصاص یافته به این موضوع، از عبارت "انقلاب بیزی" برای توصیف رشد سریع دیدگاه بیزی دربین رشته های مختلف علوم اجتماعی استفاده کرده است. این روش چندین مزیت را معرفی می کند که تخمین SEM را انعطاف پذیرتر و قدرتمندتر می کند. هدف ما در این مقاله معرفی قدرت دیدگاه بیزی به محققان گردشگری و بحث روی مزایای منحصر به فرد آن از طریق دیدگاه مبتنی بر هم پراکنش می باشد. ما ابتدا برخی پایه های تخمین و استنتاج بیزی را ارائه می دهیم. سپس با استفاده از یک کاربرد گردشگری، نمایی از این روش را نشان می دهیم. این مقاله همچنین یک شبیه سازی مونت کارلو را انجام می دهد تا عملکرد دیدگاه بیزی را در نمونه های کوچک نشان دهد و روی زمینه های مختلف پیچیده SEM بحث کند جاییکه دیدگاه بیزی مزایای منحصر به فردی را فراهم می کند.
کلیدواژه ها: دیدگاه بیزی | SEM | نمونه های کوچک | شبیه سازی مونت کارلو |
مقاله ترجمه شده |
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Mobile social tourism shopping: A dual-stage analysis of a multi-mediation model
خرید موبایلی گردشگری اجتماعی: یک تحلیل دو مرحله ای یک مدل چند واسطه ای-2018 This study investigates mobile social tourism (MST) shopping, which refers to the use of MST platforms in shopping for tourism products and services, among Malaysian domestic tourists who have visited George Town, which is a UNESCO World Cultural Heritage Site located in Penang. Drawing upon the Stimulus-Organism-Response (SOR) framework, a multi-mediation model is proposed to address this relatively new research avenue. Through the use of Partial Least Squares Structural Equation Modelling and Artificial Neural Network analyses, it was discovered that the environmental stimuli (i.e., perceived mobility, social presence, and system and service quality) directly and indirectly influence tourists MST shopping intention through their inner organism changes (i.e., perceived usefulness and perceived enjoyment). The results support the application of the SOR framework in MST shopping, as most of the developed hypotheses are supported. Practical and theoretical implications are subsequently discussed in light of the results.
keywords: Mobile social tourism shopping |Tourism products and services |Stimulus-Organism-Response framework |Partial Least Squares Structural Equation Modelling |Artificial Neural Network analysis |Multiple mediation analysis |
مقاله انگلیسی |
9 |
Interactive effects of individual- and group-level variables on virtual purchase behavior in online communities
تاثیرات تعاملی متغیرهای فردی و گروهی روی رفتار خرید مجازی در جوامع آنلاین-2018 Focusing on social network theories, we examine the interactive influence of both group-level (i.e. community influences) and individual-level variables (intrinsic and extrinsic motivations) simultaneously as the drivers of Massively Multiplayer Online Role-Playing Game (MMORPG) players’ virtual purchase behavior. We demonstrate that several aspects of real-world behavior are reflected in virtual purchase behavior. Notably, normative interpersonal influences and community identity are critical drivers and moderators of virtual purchases. Moreover, clear advancement and enjoyment opportunities offer important triggers for virtual purchase behavior. This study provides insights for game developers to increase virtual purchases, and identifies domain-specificity of each gaming platform.
keywords: Virtual consumption |Massively multiplayer online role-playing games |Social network theory |Online communities |Extrinsic and intrinsic motivation |Structural equation modeling |
مقاله انگلیسی |
10 |
The lean and resilient management of the supply chain and its impact on performance
مدیریت لاغر و انعطاف پذیر از زنجیره تامین و تاثیر آن بر عملکرد-2018 The relationship between lean management and resilience in the supply chain, whether negative or positive, is
still not clear from the existing literature. This paper aims to investigate the relationship and links between lean
and resilient supply chain (SC) practices and their impact on SC performance. To achieve this objective, the
aerospace manufacturing sector (AMS) is chosen as the study sector because of the importance of both para
digms. Interpretive Structural Modeling (ISM) approach is used in order to identify linkages among various lean
and resilience practices and SC performance metrics through a single systemic framework. ISM is an interactive
learning process based on graph theory where experts knowledge is extracted and converted into a powerful
well-structured model. For that purpose, a heterogeneous panel of experts in the AMS was formed, providing a
complete view of all SC levels in the sector. The final ISM model revealed that lean SC practices act as drivers for
resilient SC practices, since implementing the former in isolation could lead to a more vulnerable SC. The
findings also show that lean SC practices lead to a higher performance improvement than resilient SC practices.
This is due to the fact that resilient SC practices do not exert influence over all SC performance metrics as it
occurs with lean SC practices. In addition, several managerial implications regarding the most convenient
practices in terms of the companys objectives are drawn from this study.
Keywords: Lean supply chain management ، Resilient supply chain management ، Interpretive structural modeling ، Aerospace manugacturing sector |
مقاله انگلیسی |