Who Pays for Online Content? A Media Dependency Perspective Comparing Young and Older People     

Liu Yang  Louisa Ha  Fang Wang  Mohammad Abuljadail 《媒体管理杂志》2015,17(4):277-294

This study examines predictors of online content purchases through media dependency theory and comparing young and older people. It focuses on actual online content purchases instead of willingness-to-pay used in previous studies. The effects of two dimensions of media dependencies are compared: intensity and referent scopes. Social media dependency and mobile media dependency are examined specifically, in addition to general Internet dependency as new media dependency. Our results show young people make more actual purchases of online content than older people. Predictors of online content purchases include age group, online shopping habits, ownership of mobile applications and mobile devices, Internet referent dependency, and social media intensity dependency. New media referent dependency is more important than intensity dependency for predicting online content purchases.  相似文献   

Partisan Media and Discussion as Enhancers of the Belief Gap     

Aaron S. Veenstra  Mohammad Delwar Hossain  Benjamin A. Lyons 《Mass Communication and Society》2014,17(6):874-897

This study examines the roles of partisanship, partisan media use, and political discussion in the development of belief gaps. Using national survey data, we construct models of political identity, media use, and discussion factors predicting beliefs on five contested political issues and find that ideology and partisanship are generally stronger predictors of beliefs than is education. Notably, each has independent effects on belief outcomes. Contrary to some concerns that the Internet especially promotes partisan clustering, use of partisan traditional media—television and radio—is by far the strongest information-related predictor of belief outcomes, whereas partisan social media use and partisan discussion are relatively weak and inconsistent. These findings suggest that political elites continue to exert significant influence over the perceptions of rank and file partisans.  相似文献   

Personalized recommendation of learning material using sequential pattern mining and attribute based collaborative filtering     

Mojtaba Salehi  Isa Nakhai Kamalabadi  Mohammad Bagher Ghaznavi Ghoushchi 《Education and Information Technologies》2014,19(4):713-735

Material recommender system is a significant part of e-learning systems for personalization and recommendation of appropriate materials to learners. However, in the existing recommendation algorithms, dynamic interests and multi-preference of learners and multidimensional-attribute of materials are not fully considered simultaneously. Moreover, these algorithms cannot effectively use the learner’s historical sequential patterns of material accessing in recommendation. For addressing these problems and improving the accuracy and quality of recommendation, a new material recommender system framework based on sequential pattern mining and multidimensional attribute-based collaborative filtering (CF) is proposed. In the sequential pattern based approach, modified Apriori and PrefixSpan algorithms are implemented to discover latent patterns in accessing of materials and use them for recommendation. Leaner Preference Tree (LPT) is introduced to take into account multidimensional-attribute of materials, and learners’ rating and model dynamic and multi-preference of learners in the multidimensional attribute-based CF approach. Finally, the recommendation results of two approaches are combined using cascade, weighted and mixed methods. The proposed method outperforms the previous algorithms on the classification accuracy measures and the learner’s real learning preference can be satisfied accurately according to the real-time up dated contextual information.  相似文献   

Challenges and policies for promoting internationalization—The case of Iranian public universities     

Mohammad Moshtari  Sorour Delbakhsh  Maryam Ghorbani 《Higher Education Quarterly》2023,77(4):585-601

The global knowledge economy has turned higher education into a key player in societal development. Internationalization benefits higher education institutions in several aspects, such as improvement and visibility in international rankings, revenue generation via tuition fees and external funding, improvement of research and teaching quality, integration with academic communities and familiarization with scholarly attitudes. In this study, we provide insights into the challenges of internationalization faced by higher education institutions in Iran as a developing country. Several policies and practices have been adopted in Iran to improve internationalization efforts; however, these activities have had little impact on the quality of research and educational programs at Iran's universities. Understanding the challenges they face in a systematic way can help identify different factors and develop a set of suggestions to increase the quality and quantity of international cooperation. We formulate our suggestions based on the opportunities provided by the digitalization solutions in the aftermath of the COVID-19 pandemic and the increasing importance of the UN's Sustainable Development Goals in both global and national environments. We interviewed 15 faculty members in Iranian higher education institutions and 14 managers in charge of international affairs at universities in Iran. In addition, data extracted from three forums on Iranian higher education internationalization are analysed. Using a grounded theory approach, we group the challenges into macro-, institutional and individual levels and then suggest a number of practices and policies to increase the quantity and quality of internationalization efforts.  相似文献   

An architecture for Malay Tweet normalization     

Mohammad Arshi Saloot  Norisma IdrisRohana Mahmud 《Information processing & management》2014

Research in natural language processing has increasingly focused on normalizing Twitter messages. Currently, while different well-defined approaches have been proposed for the English language, the problem remains far from being solved for other languages, such as Malay. Thus, in this paper, we propose an approach to normalize the Malay Twitter messages based on corpus-driven analysis. An architecture for Malay Tweet normalization is presented, which comprises seven main modules: (1) enhanced tokenization, (2) In-Vocabulary (IV) detection, (3) specialized dictionary query, (4) repeated letter elimination, (5) abbreviation adjusting, (6) English word translation, and (7) de-tokenization. A parallel Tweet dataset, consisting of 9000 Malay Tweets, is used in the development and testing stages. To measure the performance of the system, an evaluation is carried out. The result is promising whereby we score 0.83 in BLEU against the baseline BLEU, which scores 0.46. To compare the accuracy of the architecture with other statistical approaches, an SMT-like normalization system is implemented, trained, and evaluated with an identical parallel dataset. The experimental results demonstrate that we achieve higher accuracy by the normalization system, which is designed based on the features of Malay Tweets, compared to the SMT-like system.  相似文献   

Synthesis of Gold Nanoparticles Coated with Aspartic Acid and Their Conjugation with FVIII Protein and FVIII Antibody     

Maryam Farahnak Zarabi  Ali Farhangi  Samaneh Khademi Mazdeh  Zahra Ansarian  Davod Zare  Mohammad Reza Mehrabi  Azim Akbarzadeh 《Indian journal of clinical biochemistry : IJCB》2014,29(2):154-160

Carboxylate-modified gold nanoparticles (GNPs) were synthesized in a simple one-step process based on the reduction of tetrachloroauric acid by aspartic acid in water. GNPs were identified by UV–Vis spectroscopy, dynamic light scattering (DLS) and transmission electron microscopy. Conjugation of protein molecules with functionalized nanoparticles was performed through electrostatic interaction. The GNP–protein conjugates were characterized by gel electrophoresis. The interaction between functionalized GNPs and protein molecules lead to conformational transition of protein structure after conjugation of protein with GNPs. This process was investigated by fluorescence spectroscopy and circular dichroism spectroscopy.  相似文献   

Immunoisolated Transplantation of Purified Langerhans Islet Cells in Testis Cortex of Male Rats for Treatment of Streptozotocin Induced Diabetes Mellitus     

Ali Farhangi  Dariush Norouzian  Mohammad Reza Mehrabi  Mohsen Chiani  Zahra Saffari  Maryam Farahnak  Azim Akbarzadeh 《Indian journal of clinical biochemistry : IJCB》2014,29(4):406-417

The objective of this study is to induce experimental diabetes mellitus by streptozotocin in normal adult Wistar rats via comparison of changes in body weight, consumption of food, volume of water, urine and levels of glucose, insulin and C-peptide in serum, between normal and diabetic rats. Intra-venous injection of 60 mg/kg dose of streptozotocin in 250–300 g (75–90 days) adult Wistar rats makes pancreas swell and causes degeneration in Langerhans islet β-cells and induces experimental diabetes mellitus in 2–4 days. For a microscopic study of degeneration of Langerhans islet β-cells of diabetic rats, biopsy from pancreas tissue of diabetic and normal rats, staining and comparison between them, were done. In this process, after collagenase digestion of pancreas, islets were isolated, dissociated and identified by dithizone method and then with enzymatic procedure by DNase and trypsin, the islet cells changed into single cells and β-cells were identified by immune fluorescence method and then assayed by flow-cytometer. Donor tissue in each step of work was prepared from 38 adult male Wistar rats weighted 250–300 g (75–90 days). Transplantation was performed in rats after 2–4 weeks of diabetes induction. In this study, the levels of insulin, C-peptide and glucose in diabetic rats reached to normal range as compared to un-diabetic rats in 20 days after transplantation of islet cells. Transplantation was performed under the cortex of testis as immunoisolated place for islet cells transplantation.  相似文献   

Measurement and control of pressure driven flows in microfluidic devices using an optofluidic flow sensor     

Mohammad Sadegh Cheri  Hamidreza Shahraki  Jalal Sadeghi  Mohammadreza Salehi Moghaddam  Hamid Latifi 《Biomicrofluidics》2014,8(5)

Measurement and control of pressure-driven flow (PDF) has a great potential to enhance the performance of chemical and biological experiments in Lab on a Chip technology. In this paper, we present an optofluidic flow sensor for real-time measurement and control of PDF. The optofluidic flow sensor consists of an on-chip micro Venturi and two optical Fabry-Pérot (FP) interferometers. Flow rate was measured from the fringe shift of FP interferometers resulted from movement fluid in the on-chip micro Venturi. The experimental results show that the optofluidic flow sensor has a minimum detectable flow change of 5 nl/min that is suitable for real time monitoring and control of fluids in many chemical and biological experiments. A Finite Element Method is used to solve the three dimensional (3D) Navier–Stokes and continuity equations to validate the experimental results.  相似文献   

Feedback after good versus poor trials affects intrinsic motivation     

Badami R  VaezMousavi M  Wulf G  Namazizadeh M 《Research quarterly for exercise and sport》2011,82(2):360-364

  相似文献   

The Master’s Program in Computer-Mediated Computer Communications: A Comparative Study of Two Cohorts of Students     

Mohammad Issack Santally  Jerome Raverdy 《Educational technology research and development : ETR & D》2006,54(3):312-326

  相似文献