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نتیجه جستجو - مهاجرت

تعداد مقالات یافته شده: 56
ردیف عنوان نوع
31 Migration-Based Online CPSCN Big Data Analysis in Data Centers
تحلیل داده های بزرگ CPSCN آنلاین مبتنی بر مهاجرت در مراکز داده-2018
It is critical to schedule online data-intensive jobs effectively for various applications, including cyber-physical-system and social network system. It is also useful to support timely decision making and better prediction. In this paper, we investigate the online job scheduling problem with data migration for global job execution time reduction. We first establish a time model based on the real experimental results, and propose an online job placement algorithm by taking into account the benefit of both instantaneity and locality for the jobs. We then introduce data migration to the job placement algorithm. The core idea is to make a tradeoff between the migration cost and remote access cost. The simulation results demonstrate that our algorithm has a significant improvement than FIFO, and data migration shows effectiveness on global job execution time reduction. Our algorithms also provide an acceptable fairness for jobs.
INDEX TERMS : Big data analysis, CPSCN, data center, data placement, online job scheduling
مقاله انگلیسی
32 School enrollment effects in a South-South migration context
تاثیرات ثبت نام در مدرسه در یک زمینه مهاجرت جنوب به جنوب-2018
In contrast to the heavily studied South-North migration of Latin Americans to the United States, this investigation assesses the lesser-studied influence of South-South labor migration on left-behind children’s educational attainment. Specifically, it asks the question, ‘Does the migration of Nicaraguan parents to Costa Rica contribute to better or worse education outcomes for their left-behind children?’ Based on migration and education data for 3951 children from 1858 distinct households collected within Nicaragua’s 1998 and 2001 Living Standards Measurement Studies, fixed effect model results indicate that paternal migration has a depressive effect on school enrollment but has no effect on school attendance or grade-for-age progression. Given the relatively low bar to migration establishment vis-à-vis the lack of barriers that necessitate significant monetary commitments and time delays, school enrollment results are unexpected.
keywords: South-South migration |School enrollment |Attendance |Grade-for-age progression |Nicaragua-to-Costa Rica
مقاله انگلیسی
33 The Unintended Long-Term Consequences of Mao’s Mass Send-Down Movement: Marriage, Social Network, and Happiness
پیامدهای ناخواسته درازمدت حرکت روبه پایین عظیم مائو: ازدواج، شبکه اجتماعی و شادی-2017
This paper uses the China General Social Survey (CGSS) 2003 to evaluate the long-term consequences of a forced migration, the state’s ‘‘send-down” movement (shang shan xia xiang, or up to the mountains, down to the villages) during the Chinese Cultural Revolution, on individuals’ nonmaterial well-being. The send-down program resettled over 16 million urban youths to the countryside to carry out hard manual labor over the years 1968–78. Most of them were allowed to return to urban areas when the Cultural Revolution ended. To estimate the long-term impacts of the send-down experience, we compare the outcomes of individuals with send-down experience to those of individuals without send-down experience but having similar characteristics and family backgrounds during the senddown period. We conduct primarily OLS estimates with a careful sample selection. We find that those who had the send-down experience have worse marriage outcomes, lower-quality social networks, and a lower level of happiness than non-send-downs. The negative effects of the forced migration are robust against regression methods and various model specifications. Our study adds to the growing literature in economics that seeks to evaluate the impact of forced migration.
Key words : send-down movement | forced migration | marriage | social network | happiness | China
مقاله انگلیسی
34 Changing times: Migrants’ social network analysis and the challenges of longitudinal research
تغییر زمان: تجزیه و تحلیل شبکه های اجتماعی مهاجران و چالش های تحقیق طولی-2017
Focusing on migrant social networks, this paper draws upon the sociology of time to incorporate complex notions of temporality into the research process. In so doing, we consider firstly, the challenge of going ‘beyond the snapshot’ in data collection to capture dynamism through time. Secondly, we apply the concepts of timescapes to explore ways of addressing the wider context and the interplay between spatiality, temporality and relationality in migration research. We argue that integrating a mixed methods approach to SNA, crucially including visualisation, can provide a useful methodological and analytical framework to understand dynamics. SNA can also be helpful in bridging the personal and structural dimensions in migration research, by providing a meso level of analysis. However, it is also important to connect the investigation of local and transnational networks with an analysis of the broader social, economic and political contexts in which these take shape; in other words, connecting the micro and the meso with the wider macro level. Drawing upon reflections from our migration research studies, we argue that different combinations of quantitative, qualitative and visual methods do not just provide richer sets of data and insights, but can allow us to better connect conceptualisations – and ontologies – of social networks with specific methodological frameworks.
Keywords: Migration research | Temporality | Spatiality | Mixed methods | Visualisation
مقاله انگلیسی
35 In transit: Changing social networks of sub-Saharan African migrants in Turkey and Greece
در حمل و نقل: تغییر شبکه های اجتماعی از مهاجران جنوب صحرای بزرگ آفریقا در ترکیه و یونان-2017
Research on the role of social networks in human migration has mainly relied on single snapshots in time. This paper focuses on the changes in composition and usage of the transnational networks of migrants and why these changes occur. It is based on ethnography and network analysis with forty sub-Saharan African migrants in two transit contexts: Turkey and Greece, over a 17-month period. Findings show that relationship preferences, resources and communication infrastructures constitute an individual oppor tunity infrastructure affecting how critical events produce network changes. This process is ongoing through the continued experience of critical events, suggesting that the role of networks fluctuates over time.
Keywords: Transnational networks | Transit migration | Personal network analysis | Network change
مقاله انگلیسی
36 3D Kirchhoff depth migration algorithm: A new scalable approach for parallelization on multicore CPU based cluster
الگوریتم مهاجرت عمق کریچوف 3D: یک رویکرد جدید مقیاس پذیر برای موازی سازی بر روی خوشه چند هسته ای مبتنی بر CPU-2017
In this article, a new scalable 3D Kirchhoff depth migration algorithm is presented on state of the art multicore CPU based cluster. Parallelization of 3D Kirchhoff depth migration is challenging due to its high demand of compute time, memory, storage and I/O along with the need of their effective management. The most resource intensive modules of the algorithm are traveltime calculations and migration summation which exhibit an inherent trade off between compute time and other resources. The parallelization strategy of the algorithm largely depends on the storage of calculated traveltimes and its feeding mechanism to the migration process. The presented work is an extension of our previous work, wherein a 3D Kirchhoff depth migration application for multicore CPU based parallel system had been developed. Recently, we have worked on improving parallel performance of this application by re-designing the parallelization approach. The new algorithm is capable to efficiently migrate both prestack and poststack 3D data. It exhibits flexibility for migrating large number of traces within the available node memory and with minimal requirement of storage, I/O and inter-node communication. The resultant application is tested using 3D Overthrust data on PARAM Yuva II, which is a Xeon E5-2670 based multicore CPU cluster with 16 cores/node and 64 GB shared memory. Parallel performance of the algorithm is studied using different numerical experiments and the scalability results show striking improvement over its previous version. An impressive 49.05X speedup with 76.64% efficiency is achieved for 3D prestack data and 32.00X speedup with 50.00% efficiency for 3D poststack data, using 64 nodes. The results also demonstrate the effectiveness and robustness of the improved algorithm with high scalability and efficiency on a multicore CPU cluster.
مقاله انگلیسی
37 اصلاح ضریب نفوذ کلرید بتن بر اساس هدایت الکتریکی محلول نافذ
سال انتشار: 2017 - تعداد صفحات فایل pdf انگلیسی: 6 - تعداد صفحات فایل doc فارسی: 23
برای تصحیح تاثیر محلول نافذ بر روی ضریب انتشار کلرید و تنظیم یک روش تست نفوذ پذیری که قابلیت مقایسه با دیگر روش های آزمایشگاهی بر اساس مهاجرت سریع کلرید (RCM) داشته باشد، تاثیر مواد سیمانی مکمل (SCMs)، شامل سرباره های دانه ای کوره های سیمان (GBFS) و Fly ash (FA) بر روی هدایت الکتریکی محلول نافذ مورد بررسی قرار گرفته است. یک روش صلاح ضریب انتشار کلرید بر اساس رابطه بین هدایت الکتریکی محلول نافذ و ضریب انتشار کلرید پیشنهاد شده است. ضرایب اصلاح شده انتشار کلرید ملات های یکسان با محلول های متفاوت توسط جایگزین کردن محلول نافذ اصلی با محلول NaOH که تقریبا یکسان است، پیدا شده است. ضرایب اصلاح شده انتشار کلرید مربوط به بتن با SCM های متفاوت نزدیک به محتوای جذب آب مربوط به آن بوده است. نتایج نشان می دهند که از ضریب اصلاح شده انتشار کلرید تاثیرات هدایت الکتریکی محلول نافذ را از بین برده و می تواند منعکس کننده خواص انتقال بتن مربوط به منافذ اتصال باشد، بنابراین می تواند برای ارزیابی نفوذ پذیری کلی بتن مورد استفاده قرار بگیرد.
مقاله ترجمه شده
38 Evidence of the paradoxical effect of social network support_ A study among Filipino domestic workers in China
شواهد اثرات متناقض حمایت از شبکه های اجتماعی. مطالعه در میان کارگران خانگی فیلیپینی در چین-2017
Labor migrants are at an increased risk for poor mental health. Post-migration stressors contribute significantly to this risk. Social network supports are vitally important to protect health but little is known about the role of social network supports among labor migrants. The current study evaluated the role of migration stressors on poor mental health among Filipino female domestic workers (FDW) and whether family and friend social net work support (SNS) modified this relationship. Data were collected from 261 FDWs in Macau, China from May to September 2013. Hierarchical multiple regression was conducted to test for direct and moderating effects of social networks on psychological distress. Post-migration stress was associated with increased anxiety, depres sion, somatization, and post-traumatic stress disorder symptoms. SNS from family was not associated with the four psychological symptoms nor did it modify the association between stress and these symptoms. SNS from friends was positively associated with these symptoms, and significantly moderated the relationship between stress and these symptoms. Counterintuitive to the known buffering effects of SNS, greater SNS was associated with greater psychological symptoms among FDWs exposed to post-migration stressors. The present findings suggest that reliance on SNS to cope with post-migration stressors may worsen psychological distress.
Keywords: Social network support | Migration stress | Mental health | Filipino | Female domestic workers
مقاله انگلیسی
39 An effective approach for managing power consumption in cloud computing infrastructure
رویکرد موثر برای مدیریت مصرف برق در زیرساخت های محاسبات ابری-2017
Cloud computing offers a dynamic provisioning of server capabilities as a scalable virtualized service. Big datacenters which deliver cloud computing services consume a lot of power. This results in high operational cost and large carbon emission. One way to lower power consumption without affecting the cloud services quality is to consolidate resources for reducing power. In this paper, we introduce a DNA based Fuzzy Genetic Algorithm (DFGA) that employs DNA-based scheduling strategies to reduce power consumption in cloud datacenters. It is a power-aware architecture for managing power consumption in the cloud computing infrastructure. We also identify the performances metrics that are needed to evaluate the proposed work performance. The experimental results show that DFGA reduced power consumption when comparing with other algorithms. Our proposed work deals with real time task which is not static, and concentrates on the dynamic users since they are involved in cloud.
Keywords: Cloud computing | DNA-based fuzzy genetic | DFGA | Energy consumption | Resource utilization | VM consolidation | VM migration
مقاله انگلیسی
40 پایداری شیب راه های بلوکی بدون ساختار
سال انتشار: 2017 - تعداد صفحات فایل pdf انگلیسی: 8 - تعداد صفحات فایل doc فارسی: 28
مشخصه سازه‌های شیبراه بلوکی بدون ساختار و سازگار با محیط زیست برای پایدارسازی بستر رودخانه‌ها المان‌های با زبری بزرگ است که بطور تصادفی در بستر رودخانه قرار می‌گیرند. آزمایش‌های مدل فیزیکی برای بررسی پایداری و رفتار آنها تحت اضافه بار انجام شده‌اند. پارامترهای متفاوت توصیف گر مواد سازنده بلوک و مواد اولیه به منظور یافتن ترکیبی بهینه از حیث پایداری شیبراه با حداکثر شیب شیبراه که نوعاً بین 1 تا 3 درصد متغیر است به انجام رسیدند. مدلی برای تعیین پایداری شیبراه معرفی می‌شود که در آن شیب تعادلی شیبراه با دبی ویژه بدون بعد و ازجمله اطلاعاتی مربوط به ابعاد بلوک، تراکم بلوک ریزی و اندازه مشخصه دانه‌های مواد اولیه ارتباط دارد.
کلیدواژه‌ها: شیبراه های بلوکی بدون ساختار | آزمایش‌های فیزیکی | مهاجرت ماهیان | پایداری بستر رودخانه
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