نتایج جستجو برای: operation research or

تعداد نتایج: 4618531  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1389

in the past couple of decades sociocultural theory of sla and its implications in efl contexts have attracted attentions of research circles worldwide and aroused some controversies. firth and wagner (1997) have questioned the principles of the cognitive view which gives importance to mental constructs in favor of sociocultural view which highlights social and contextual constructs. but if soci...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علامه طباطبایی - دانشکده ادبیات و زبانهای خارجی 1392

while performance-based language assessment has led to an increased authenticity and content validity in the practice of writing assessment, the reliability of ratings has become a major issue. research findings have shown different reactions by native english speaker (nes) and non-native english speaker (nns) teachers to students’ writings. the focus of this study is on investigating whether i...

Journal: :Journal of Agricultural and Applied Economics 1974

2015
Yisen Meng Kai Zhang Zhanju He Jing Peng Wei Yu Jie Jin

Objective: Young men present as erectile dysfunction (ED) were usually thought to be related to psychiatric problems. Penile duplex Doppler ultrasonography (PDDU) is a minimally-invasive method for evaluating the penile hemodynamics in men with ED. To date, little is known about the findings of PDDU in men younger than 40 years. The aim of this study is to evaluate the results of PDDU in this a...

The banking system is executed by many beneficiaries such as depositors, borrowers, banking services customers, stockholders, banking staff and managers and etc. The beneficiaries’ rights observation of banking that usually is known as Corporate Governance in banking, has constructive effects on economic. The main goal of the research is the survey of beneficiaries’ rights observation in deposi...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم انسانی 1389

abstract in a protocol analysis of second language writing from 20 adult english as a foreign language (efl) iranian students, this research observed how language-switching (l-s), i.e., first language use in l2 writing, was affected by l2 proficiency. switching interactively between first (l1) and second (l2) languages has been recognized as one of the salient characteristics of l2 writing....

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم انسانی 1389

abstract the present research is prepared to study the culture of tea consuming among iranian. the case group which was statistically used for this study was people of lahijan , about four hundred wich were chosen according to their age , gender , education and occupation , randomly selected to fill the questionnaire . then the data collected through the questionnaire was analyzed according ...

Journal: :Biometrics 2012
Hulin Wu Hongqi Xue Arun Kumar

Differential equations are extensively used for modeling dynamics of physical processes in many scientific fields such as engineering, physics, and biomedical sciences. Parameter estimation of differential equation models is a challenging problem because of high computational cost and high-dimensional parameter space. In this article, we propose a novel class of methods for estimating parameter...

Journal: :American Journal of Public Health and the Nations Health 1962

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