Using cloud computing services in e-learning process: Benefits and challenges     

Abderrahim El Mhouti  Mohamed Erradi  Azeddine Nasseh 《Education and Information Technologies》2018,23(2):893-909

During the recent years, Information and Communication Technologies (ICT) play a significant role in the field of education and e-learning has become a very popular trend of the education technology. However, with the huge growth of the number of users, data and educational resources generated, e-learning systems have become more and more expansive in terms of hardware and software resources, and many educational institutions cannot afford such ICT investments. Due to its tremendous advantages, cloud computing technology rises swiftly as a natural platform to provide support to e-learning systems. This paper focuses on the research on the application of cloud computing in e-learning. The aim of this paper is to give an overview of the current state and the impact of the use of cloud computing for e-learning. Thus, at first the paper introduces concepts of e-learning and cloud computing infrastructure with their key characteristics. The paper analyzes also challenges facing e-learning systems deployment. In follow the paper considers cloud-based e-learning solutions by focusing on the raisons of the convenience of cloud computing for e-learning. Therefore cloud computing benefits are introduced as a solution for these challenges. Finally, the paper presents some solutions of cloud computing in e-learning and describes the most common architecture adopted. Issues in implementing cloud-based e-learning systems and some potential ways to overcome them are also discussed.  相似文献   

Transforming Growth Factor-β1/Smad3 Signaling and Redox Status in Experimentally Induced Nephrotoxicity: Impact of Carnosine     

Walaa Arafa Keshk  Mohamed Alaa Katary 《Indian journal of clinical biochemistry : IJCB》2017,32(1):19-25

Exposure to various organic compounds including drugs and environmental toxins causes cellular damage through generation of free radicals. Carnosine a dipeptide was used in this study to evaluate its effect against CCl4-induced nephrotoxicity. Sixty male albino rats were involved in this study and were equally divided into four groups. CCl4 (3 ml/kg body weight; biweekly for 4 weeks) was given to group II and III. Carnosine (10 mg/kg body weight; once daily for 4 weeks) was given to group III and VI. Transforming growth factor-β1 (TGF-β1) level by immunoassay and Smad3 mRNA level by real-time PCR were estimated in addition to cytochrome P450 2E1 (CYP2E1) activity, renal functions, redox status assessment and histopathological examination of the kidney. Carnosine significantly improved kidney function, renal redox status, decreased renal CYP2E1 activity, TGF-β1 level and Smad3 gene expression when compared to CCL4-intoxicated group. The protective effect of carnosine was confirmed by histopathological study. In conclusion: carnosine has the ability to protect against CCl4-induced nephrotoxicity possibly by alleviating oxidative stress, normalizing kidney histopathological architecture in addition to the disruption of the inflammatory and fibrotic response induced by CCl4.  相似文献   

Knowledge heterogeneity and social network analysis – Towards conceptual and measurement clarifications     

Mohamed El?LouadiEmail author 《知识管理研究与实践》2008,6(3):199-213

This literature review highlights some Social Network Analysis (SNA) concepts applicable to the study of organizational knowledge and, more particularly, to knowledge heterogeneity. Knowledge being all at the same time decentralized and distributed, knowing up to what point knowledge can be heterogeneous or homogeneous across organizational units becomes as important as the question of knowing how to structure the organization. SNA applied to knowledge management thus seems a stimulant for future research in the fields of management.  相似文献   

A diagnostic dilemma in Jordan: two child abuse case studies     

H Nazer  T Daradkeh  S Mohamed  A Q Shamayleh  O Marei 《Child abuse & neglect》1988,12(4):593-599

Child abuse was diagnosed in two Jordanian children. The first was a 15-month-old female infant admitted with a history of convulsions and loss of consciousness. The child had previous head and limb injuries resulting in bilateral subdural hematomas and fractures at different stages of healing of femur and pelvis. The second was a 3-year-old male admitted with history of head injury due to an alleged fall. Examination revealed fractured ribs, bruised eye and face, hemothorax, subperiosteal and subdural hematomas. Both children have sustained physical and mental handicaps. This is the first report of child abuse in Jordan. In Jordan, as in the rest of the world, a high index of suspicion is needed to diagnose child abuse early enough to save the affected child its serious sequelae.  相似文献   

Problems of drinking water treatment along Ismailia Canal Province, Egypt     

Geriesh MH  Balke KD  El-Rayes AE 《Journal of Zhejiang University. Science. B》2008,9(3):232-242

The present drinking water purification system in Egypt Uses surface water as a raw water supply without a pre-liminary filtration process.On the other hand,chlorine gas iS added as a disinfectant agent in two steps,pre- and post.chlorination.Due to these reasons most of water treatment plants suffer low fltering effectiveness and produce the trihalomethane (THM) species as a chlorination by-product.The Ismailia Canal represents the most distal downstream of the main Nile Rivet.ThUS its water contains all the proceeded pollutants discharged into the Nile.In addition.the downstream reaches of the canal act as an agricultural drain during the closing period of the High Dam gates in January and February every year.Moreover,the wide in-dustrial zone along the upstream course of the carlal enriches the canal water with high concentrations of heavy metals.The obtained results indicate that the canal gains up to 24.06×106m3 of water from the surrounding shallow aquifer during the closing period ofthe High Dam gates,while during the rest ofthe year,the callal acts as an influent stream losing about 99.6×106m3 of its water budget.The reduction oftotaI organic carbon(TOC) and suspended particulate mattes(SPMs)should be one of the central goals of any treatment plan to avoid the disinfectants by-products.The combination of sedimentation basins.gravel pre-filtration and slow sand filtration,and underground passage with microbiological oxidation-reduction and adsorption criteria showed good removal of parasites and bacteria and complete elimination of TOC.SPM and heavy metals.Moreover,it reduces the use of disinfectants chemicals and lowers the treatment costs.However,this purification system under the arid climate prevailing in Egypt should be tested and modified prior to application.  相似文献   

Assessment of counselling needs: A comparative study of the perceptions of primary school teachers in Lesotho and Malaysia     

Sally L. Navin  Noran Fauziah Yaakub  Othman Mohamed 《International journal for the advancement of counseling》1995,18(2):97-113

In this paper the results of a study conducted to determine the perception of counselling needs by primary school teachers in Malaysia and Lesotho are reported. To this end, teachers were asked about the special needs of students they teach, how they cope with these students, what assistance they would like to have in teaching, and the best approach for dealing with student concerns. Teachers in Lesotho are dealing with larger numbers of special needs students and thus are having more difficulties than Malaysian teachers. Malaysian teachers appeared to be more interested in improving their teaching effectiveness. There was some variation in the perceptions of how to best deal with student concerns.  相似文献   

Factors Related to Teacher-Directed Play Between Preschool-Age Children With Special Needs and Their Typical Peers     

Laura Nabors  Mohamed Badawi  Sarah Cheney 《Early education and development》1997,8(4):407-417

This study investigated the relations among child factors, classroom factors, and the percentage of observations that preschoolers with and without special needs spent in teacher-directed group play. Differences in the number of observations for other types of play (e.g., playing with a teacher or playing cooperatively with peers) between children with and without special needs also was examined. Additionally, the percentage of observations spent by children with and without special needs in different classroom activities and centers was examined. Participants were 48 typically developing children and 22 children with special needs. A scanning method was used to assess play types for the children. Results indicated that girls were more likely to play cooperatively in teacher-directed groups than boys. And, children with special needs were more likely to play with a teacher and less likely to play cooperatively with peers than their typically developing classmates. Children with and without special needs frequently engaged in play in the following areas: art, blocks, science, making food, talking with classmates. In future studies, investigators should observe the different types of child and teacher behaviors related to increased interactions between children who have special needs and their typically developing classmates.  相似文献   

Attitudes of special education teachers towards using technology in inclusive classrooms: a mixed‐methods study          下载免费PDF全文

Ahmed Hassan Hemdan Mohamed 《Journal of Research in Special Educational Needs》2018,18(4):278-288

The purpose of this mixed‐methods study was to explore special education teachers’ attitudes towards using technology in inclusive classrooms in Oman. The sample consisted of 428 special education teachers working in Omani public schools (250 teachers of students with learning disabilities (LD), 90 teachers of students with intellectual disability and 88 teachers of students with hearing impairment). Participants responded to the attitudes towards computers questionnaire. For the qualitative section of this study, three semi‐structured group interviews were conducted with a group of special education teachers: 15 teachers of students with hearing impairment, 15 teachers of students with intellectual disabilities and 15 teachers of students with LD). Also, the teachers responded to a survey of educational technology which encompassed seven questions about computer technology. Results of the study indicated that the special education teachers’ attitudes towards using computers were generally positive. The most notable positive attitudes were in the following subscales: special education considerations, staff development considerations, computers use in society, and computers and quality of instruction issues. The analysis of variance results showed that experience and type of disability did not have a significant effect on teachers’ attitudes towards technology.  相似文献   

Morning–evening difference of team-handball-related short-term maximal physical performances in female team handball players     

Thouraya Mhenni  Lars Bojsen Michalsik  Mohamed Arbi Mejri  Narimen Yousfi  Anis Chaouachi  Nizar Souissi 《Journal of sports sciences》2017,35(9):912-920

This study investigated the two different time-of-day effect on team-handball-related short-term maximal physical performances. At two different time-of-day, fifteen young female team handball players performed different physical tests: HandGrip (HG) test, Ball-Throwing Velocity (BTV) test, Modified Agility T-test (MAT) and Repeated Shuttle-Sprint and Jump Ability (RSSJA) test. Rating of perceived exertion (RPE) scale was determined following the termination of the last test. Measurements were performed at two separate testing sessions (i.e., in the morning (7:00–8:30 h) and in the early evening (17:00–18:30 h)) in a randomised and counter-balanced setting on non-consecutive days. The results showed that HG (P = 0.0013), BTV (P = 0.0027) and MAT (P < 0.001) performances were better in the evening compared with the morning. During RSSJA, both best and mean sprint times were shorter in the evening compared to the morning (P < 0.001). Moreover, during the latter test, mean jump performance was higher in the evening compared to the morning (P = 0.026). However, there was no morning–evening difference in the best jump performance during RSSJA. Likewise, jump performance decrement was not affected by the time-of-day of testing. On the other hand, RPE fluctuated, with morning nadirs and afternoon/early evening highest values. The findings suggest that in female team handball players, team-handball-related short-term maximal physical performances were better in the afternoon than in the morning.  相似文献   

Starting,Strengthening and Managing Institutional Repositories: A How-to-Do-It Manual By Jonathan A. Nabe. How-to-Do-It Manuals, 169. New York: Neal-Schuman Publishers, 2010. 169 pp. US$80.00 soft cover ISBN 9781555706890     

Mohamed Taher 《Library Collections, Acquisitions, and Technical Services》2010,34(4):132-133

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