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Computer vision model for estimating the mass and volume of freshly harvested Thai apple ber ( Ziziphus mauritiana L:) and its variation with storage days
مدل بینایی کامپیوتری برای تخمین جرم و حجم سیب تازه برداشت شده تایلندی (Ziziphus mauritiana L:) و تغییرات آن با روزهای نگهداری-2022 The physical properties of fruits are proportional to their mass and volume; this connection is used to determine
the fruit qualities and in designing the novel postharvest machinery. The present study aimed to forecast the
mass and volume of Thai apple ber (Ziziphus mauritiana L.) as a function of its physical properties measured using
image processing techniques at different stages of ripening (1st day, 4th day, 7th day, and 10th day). The mass
and volume models developed and analyzed the single variable regression, multilinear regressions, and mass
regression based on volume. Among these models, linear support vector machine (SVM) was found appropriate.
The experimental data analysis showed that the R2 of the linear SVM model for mass and volume of the projected
area were 0.955 and 0.965, respectively. In contrast, for the multilinear regression model, R2 values were 0.967
and 0.972, respectively. For the mass prediction model, the R2 was 0.970 based on calculated volume showing a
linear relationship. Thus, it was concluded that real-time measurement of physical properties of Thai apple ber
using an image-processing technique to estimate the mass and volume is a precise and accurate approach. keywords: بینایی کامپیوتر | پردازش تصویر | فراگیری ماشین | پسرفت | ماشین بردار پشتیبانی | Computer vision | Image processing | Machine learning | Regression | Support vector machine |
مقاله انگلیسی |
2 |
مهاجران جهانی: درک پیامدهای تجارت و مدیریت بین المللی
سال انتشار: 2021 - تعداد صفحات فایل pdf انگلیسی: 11 - تعداد صفحات فایل doc فارسی: 47 مهاجرت جهانی همیشه افراد ، سازمانها و جوامع را تحت تأثیر قرار داده است ، اما توجه به مهاجرت در تجارت و مدیریت بین المللی (IB / IM) متناسب با اهمیت آن نبوده است. در این مقاله توضیح می دهیم که چرا تمرکز بر مهاجرت مورد نیاز است ، چگونه به این موضوع تاکنون در این زمینه پرداخته شده است ، و به ویژه اینکه چگونه می تواند به تولید دانش و بینش مربوط به عمل و سیاست کمک کند. ما با معرفی مجموعه ای از مطالعات در یک شماره ویژه در مورد مهاجرت جهانی و پیامدهای آن برای IB / IM ، بر اهمیت این پدیده تأکید می کنیم.
کلید واژه ها: مهاجرت | تجارت بین المللی | مدیریت بین الملل |
مقاله ترجمه شده |
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The role of management accounting systems in global value strategies
نقش سیستم های حسابداری مدیریت در استراتژی های ارزش جهانی-2021 In this paper, we explore the relationship and interdependencies of firms’ positions in global markets, innova-
tion, foci on value creation or value development strategies and their intensity of use and system design of
management accounting (MA) tools. We collect data through a survey of the 500 largest Portuguese firms. The
results show multiple interdependencies of MA intensity of use and system design and global positioning as well
as the value foci of firms. Global market positioning, as well as MA intensity, is directly associated with inno-
vation. The multiple configurations also show that the value strategy focus (creating new products or solely
developing them for different markets) changes the nature of the MA system put in place by firms. Consequently,
we contribute to the discussion of MA systems vs MA packages by specifically addressing the fit and internal
consistency of those tools. Methodologically, the results are robust to different analytical tools - multivariate
regression, fuzzy-set qualitative comparative analysis (fsQCA) and factor analysis. keywords: سیستم های حسابداری مدیریت | ارزشآفرینی | بازارهای جهانی | fsqca | Management accounting systems | Value creation | Global markets | fsQCA |
مقاله انگلیسی |
4 |
Disproportionate redemption discounting: Mental accounting of discounted credit
تنزیل بازخرید نامتناسب: حسابداری ذهنی اعتبارِ تخفیف خورده-2021 Redeeming purchases using discounted credit (i.e., store credit bought at a lower price than its face value) is
widespread, but its mental accounting implications remain unclear. This work finds that consumers making
multiple redemptions on separate occasions with the same discounted credit do not perceive all redemptions as
equally discounted. Redemptions made earlier in that discounted credit’s spending life cycle (upstream re-
demptions) are perceived as less discounted than redemptions made later (downstream redemptions). This
“disproportionate redemption discounting” effect occurs because users feel more certain that they can deplete
their credit when they make downstream redemptions and feel like they have the freedom to mentally assign the
discounted credit savings unevenly among multiple redemptions. Relatedly, individuals have higher willingness
to pay when making downstream redemptions than upstream redemptions. Disproportionate redemption dis-
counting and its’ behavioral consequences are unique to discounted credit and do not generalize to all store
credit. keywords: اعتبار تخفیف یافته | حسابداری ذهنی | ادراکات هزینه | تبلیغات قیمت | Discounted credit | Mental accounting | Cost perceptions | Price promotions |
مقاله انگلیسی |
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Demystifying knowledge hiding in academic roles in higher education
ابهام زدایی از دانش پنهان در نقش های تحصیلی در آموزش عالی-2021 This paper presents a novel conceptual map of how knowledge hiding is understood and practiced in the higher
education context. Building on a review of the knowledge management literature, we first discuss the nature of
knowledge, the conceptualization of knowledge hiding, and other related concepts. Next, we identify factors that
are linked to knowledge hiding intention and behaviors at the individual, interpersonal and organizational levels
based on three major roles of academics: teaching, research, and leadership-administration (or service), culmi-
nating with an original conceptual map. Finally, based on the conceptual map, we present propositions that
warrant future research to advance understanding about knowledge hiding in the higher education context. Our
review and conceptual map provide important implications to the knowledge management literature at large. keywords: Knowledge hiding | Higher education | Conceptual map | Academic roles | Access |
مقاله انگلیسی |
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Asynchrony Between Individual and Government Actions Accounts for Disproportionate Impact of COVID-19 on Vulnerable Communities
ناهمزمانی بین اقدامات فردی و دولتی تاثیر نامتناسب COVID-19 بر جوامع آسیب پذیر-2021 Introduction: Previously estimated effects of social distancing do not account for changes in individual behavior before the implementation of stay-at-home policies or model this behavior in relation to the burden of disease. This study aims to assess the asynchrony between individual behavior
and government stay-at-home orders, quantify the true impact of social distancing using mobility
data, and explore the sociodemographic variables linked to variation in social distancing practices.
Methods: This study was a retrospective investigation that leveraged mobility data to quantify the
time to behavioral change in relation to the initial presence of COVID-19 and the implementation of
government stay-at-home orders. The impact of social distancing that accounts for both individual
behavior and testing data was calculated using generalized mixed models. The role of sociodemographics in accounting for variation in social distancing behavior was modeled using a 10-fold crossvalidated elastic net (linear machine learning model). Analysis was conducted in April‒July 2020.
Results: Across all the 1,124 counties included in this analysis, individuals began to socially distance at a median of 5 days (IQR=38) after 10 cumulative cases of COVID-19 were confirmed in
their state, with state governments taking a median of 15 days (IQR=1219) to enact stay-at-home
orders. Overall, people began social distancing at a median of 12 days (IQR=817) before their
state enacted stay-at-home orders. Of the 16 studies included in the review, 13 exclusively used government dates as a proxy for social distancing behavior, and none accounted for both testing and
mobility. Using government stay-at-home dates as a proxy for social distancing (10.2% decrease in
the number of daily cases) accounted for only 55% of the true impact of the intervention when compared with estimates using mobility (18.6% reduction). Using 10-fold cross-validation, 23 of 43 sociodemographic variables were significantly and independently predictive of variation in individual
social distancing, with delays corresponding to an increase in a county’s proportion of people without a high school diploma and proportion of racial and ethnic minorities.
Conclusions: This retrospective analysis of mobility patterns found that social distancing behavior
occurred well before the onset of government stay-at-home dates. This asynchrony leads to the
underestimation of the impact of social distancing. Sociodemographic characteristics associated
with delays in social distancing can help explain the disproportionate case burden and mortality
among vulnerable communities.
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مقاله انگلیسی |
7 |
Extending Fitts’ law in three-dimensional virtual environments with current low-cost virtual reality technology
گسترش قانون Fitts در محیط های مجازی سه بعدی با فناوری واقعیت مجازی کم هزینه فعلی-2020 Virtual reality (VR) interfaces require users to perform three-dimensional reaching and pointing movements to
interact with objects positioned within the users arms reach. However, there has been limited work that has
evaluated the applicability of established models of human motor control to model performance of these tasks in
3D virtual reality environments using current low-cost technologies. In this study, a 3D discrete pointing task
using the Oculus Rift system was used to explore potential influences on movement in VR and to account for
these influences in a new formulation of Fitts’ law. Target size and distance from the starting point of movement
were systematically varied to generate a broad range of index of difficulty (ID) values. Target locations were
specified using a spherical coordinate system in which inclination angle corresponded to the pitch of the
movement axis with respect to the starting point of movements and azimuth angle corresponded to the roll of the
movement axis with respect to the horizontal plane. In line with previous work, we observed that target size,
radial distance, and inclination angle had a significant effect on movement time. The effect of inclination angle
varied with target size, which suggests that target size affected depth estimation. Significant target characteristics
and interaction effects were used to develop an extended Fitts’ law model, which accounted for 64.5% of
the variation in movement times. Comparisons to other Fitts’ law models revealed that models accounting for the
effects of target depth improved predictive power relative to the traditional Fitts’ law formulation. Together,
these findings support the value of extending Fitts’ law models to account for domain-specific constraints in VR
environments. We discuss these results in the context of previous work examining HMD display deficiencies and
discrete 3D pointing tasks, and suggest several directions for future work. Keywords: Fitts’ law | Virtual reality | Oculus Rift | Depth perception | Stereoscopic display |
مقاله انگلیسی |
8 |
Optimal guidance laws with prescribed degree of stability
قوانین راهنمایی بهینه با درجه ثبات تعیین شده-2020 The prescribed degree of stability criterion is used. This quadratic criterion involves an increasing exponential time dependent term in the integral part of the criterion. This criterion is used for derivation of guidance laws. The derived guidance law has the classical structure of guidance gain times the zero-effort miss. The important issue is the fact that initially the guidance gain and thus the commanded acceleration are larger than in the conventional Proportional Navigation guidance law, but near the end, the commanded acceleration is smaller. The new guidance law attempts to close the zero effort miss earlier in the scenario than the conventional guidance law. Keywords: Guidance | Zero-effort-miss | Quadratic criterion | Proportional navigation |
مقاله انگلیسی |
9 |
التهاب کیسه صفرا حاد و سنگ مجرای اصلی صفراوی باقیمانده در بیماری معكوس بودن اندام ها ، روش لاپاروسکوپی موفق و ERCP (مورد مطالعاتی اکوادور)
سال انتشار: 2020 - تعداد صفحات فایل pdf انگلیسی: 5 - تعداد صفحات فایل doc فارسی: 11 معكوس بودن کامل اندام ها، وضعیت نادر ژنتیکی است که با انتقال اعضا به سمت معکوس بدن مشخص می شود ، در نتیجه ، سندرم های بالینی، تصویری بالینی غیرمعمول را نشان می دهند که یک چالش برای تیم جراحی است و زمینه ساز تاخیر در درمان و تشخیص است. برداشتن کیسه صفرا به روش لاپاراسکوپی، یک استاندارد طلایی برای التهاب کیسه صفرا حاد است و در بیماران مبتلا به سیتوس وارونگی ، روش لاپاروسکوپی باید متناسب با آناتومی بیمار اصلاح شود.
ارائه موردی: پرونده یک بیمار مرد 55 ساله بدون سابقه پزشکی قبلی ارائه شد ، این مرد با درد شکم در قسمت فوقانی سمت چپ خود به اورژانس مراجعه کرد. پس از یک معاینه دقیق ، التهاب کیسه صفرا حاد و معكوس بودن اندام ها تشخیص داده شد. وی بدون عارضه تحت عمل جراحی برداشتن کیسه صفرا به روش لاپاراسکوپی اصلاح شده قرار گرفت. در دوره بعد از عمل ، سنگ مجرای اصلی صفراوی باقی مانده شناسایی و ERCP انجام شد. در پیگیری ها ، بیمار وضعیت خوبی داشت. نتیجه گیری: اگرچه برداشتن کیسه صفرا به روش لاپاراسکوپی و ERCP در بیمار مبتلا به معکوس بودن اندام نادر و از نظر فنی سخت است، اما امکان پذیر است. آناتومی تغییر یافته می تواند منجر به پیچیدگی شود ، بنابراین بنابراین برنامه ریزی مناسب و اجرای دقیق تکنیک های حین عمل ضروری است. واژه های کلیدی: معکوس بودن اندام ها | کولسیستیت حاد | کوله سیستکتومی لاپاراسکوپی |
مقاله ترجمه شده |
10 |
Disadvantage and economic viability: characterising vulnerabilities and resilience in upland farming systems
معایب و دوام اقتصادی: توصیف آسیب پذیری ها و انعطاف پذیری در سیستم های کشاورزی مرتفع-2020 Less Favoured Areas (LFA) were designated to support farming activity on land with limited productive po- tential. However, progressive land abandonment in these areas questions the rationale and targeting of support payments to maintain viable farming enterprises. Using micro level data on farm businesses over the period 2003-2016 matched to land capability and spatial data we identify the distribution of viable and vulnerable enterprises in Less Favoured Areas. We find five categories of household based on progressive quality of life thresholds, namely i. vulnerable, ii. sustainable, iii. viable, iv. resilient, and v. robust. A proportional odds model measured the effect of biophysical and remote disadvantage on predicting these states of viability, along with farm family lifecycle factors. Whilst we would expect higher proportions of disadvantaged farmland to be ne- gatively related to viability, when combined with rural remoteness this increases the magnitude of the effect. However, clear succession planning and tenancy arrangements suggest that approaches to management of the business and the farm family life-cycle may overcome some of these disadvantages. These results have to be considered against the UK’s planned withdrawal from the Common Agricultural Policy. This offers opportunities to provide a more nuanced approach to targeting and supporting disadvantaged regions beyond current criteria. However, there would seem to be dissonance between the proposed payment for public goods agenda, which is results orientated, and support for correcting natural disadvantages where opportunities for delivery of these public goods will be limited. Keywords: Less favoured areas | Proportional odds model | Payment for public goods | Brexit |
مقاله انگلیسی |