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Topic Modelling and Sentimental Analysis of Students’Reviews

Computers, Materials & Continua 2023年第3期74卷 6835-6848页

作者： Omer S.Alkhnbashi rasheed mohammad nassr Information and Computer Science Department King Fahd University of Petroleum and Minerals31261Kingdom Saudi Arabia Computer Science Department School of Computing and Digital TechnologyBirmingham City UniversityBirminghamB55JUUnited Kingdom

Globally,educational institutions have reported a dramatic shift to online learning in an effort to contain the COVID-19 *** fundamental concern has been the continuance of *** a result,several novel solutions have been developed to address technical and pedagogical ***,these were not the only difficulties that students *** implemented solutions involved the operation of the educational process with less regard for students’changing circumstances,which obliged them to study from *** should be asked to provide a full list of their *** a result,student reflections,including those from Saudi Arabia,have been analysed to identify obstacles encountered during the COVID-19 ***,most of the analyses relied on closed-ended questions,which limited student *** delve into students’responses,this study used open-ended questions,a qualitative method(content analysis),a quantitative method(topic modelling),and a sentimental *** study also looked at students’emotional states during and after the COVID-19 *** terms of determining trends in students’input,the results showed that quantitative and qualitative methods produced similar *** had unfavourable sentiments about studying during COVID-19 and positive sentiments about the face-to-face ***,topic modelling has revealed that the majority of difficulties are more related to the environment(home)and social *** were less accepting of online *** a result,it is possible to conclude that face-to-face study still attracts students and provides benefits that online study cannot,such as social interaction and effective eye-to-eye communication.

关键词： Topic modelling sentimental analysis COVID-19 students’input

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Power Inverted Topp–Leone Distribution in Acceptance Sampling Plans

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Computers, Materials & Continua 2021年第4期67卷 991-1011页

作者： Tahani A.Abushal Amal S.Hassan Ahmed R.El-Saeed Said G.nassr Faculty of Science Umm AL-Qura UniversityMakkah Al Mukarramah715Saudi Arabia Faculty of Graduate Studies for Statistical Research Cairo UniversityGiza12613Egypt Obour High Institute for Management&Information Al-Sharqua44516Egypt Faculty of Business Administration Sinai UniversityAl-Arish45511Egypt

We introduce a new two-parameter model related to the inverted Topp–Leone distribution called the power inverted Topp–Leone(PITL)*** properties of the PITL distribution are stated;including;quantile measures,moments,moment generating function,probability weighted moments,Bonferroni and Lorenz curve,stochastic ordering,incomplete moments,residual life function,and entropy *** sampling plans are developed for the PITL distribution,when the life test is truncated at a pre-specified *** truncation time is assumed to be the median lifetime of the PITL distribution with pre-specified *** minimum sample size necessary to ensure the specified life test is obtained under a given consumer’s *** results for given consumer’s risk,parameters of the PITL distribution and the truncation time are *** estimation of the model parameters is argued using maximum likelihood,least squares,weighted least squares,maximum product of spacing and Bayesian methods.A simulation study is confirmed to evaluate and compare the behavior of different *** real data applications are afforded in order to examine the flexibility of the proposed model compared with some others *** results show that the power inverted Topp–Leone distribution is the best according to the model selection criteria than other competitive models.

关键词： Inverted Topp-Leone distribution acceptance sampling plans maximum likelihood estimators weighted least squares estimators Bayesian estimators

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临床研究的系统回顾:关于干细胞治疗椎间盘源性疼痛的安全性和有效性的研究进展

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中国疼痛医学杂志 2018年第12期24卷 888-890页

作者： christine l.hunt stephanie shen ahmad nassr 金雨颖(译) 靳天(译) 马柯(校) 不详上海交通大学医学院附属新华医院疼痛科

本研究是一个关于干细胞治疗椎间盘源性疼痛的临床研究的系统性回顾,目的是概述目前临床试验和间充质干细胞治疗椎间盘源性疼痛的可行性。从研究早期至2016年7月,对Ovid数据库和***进行了搜索。纳入了干细胞治疗椎间盘源性腰背痛疗效评... 详细信息

本研究是一个关于干细胞治疗椎间盘源性疼痛的临床研究的系统性回顾,目的是概述目前临床试验和间充质干细胞治疗椎间盘源性疼痛的可行性。从研究早期至2016年7月,对Ovid数据库和***进行了搜索。纳入了干细胞治疗椎间盘源性腰背痛疗效评估的临床试验及案例报告。在已发表的研究中,感兴趣的结果包括疼痛评分、腰背痛ODI评分、显示髓核的水含量的MRI T2像强度。在Ovid databases使用特定的搜索词进行初步搜索获得了408条结果,其中有11条搜索结果符合此次研究的纳入标准,其中包含6个已完成的研究和5个在进行的临床试验,这5个临床试验中有4个在检索时处于研究进行状态。在6个已完成的研究中,椎间盘内注射干细胞后其疼痛评分、ODI、T2像髓核信号强度均有改善。目前进行中的临床试验主要在于建立干细胞治疗腰痛的安全性、耐受性以及有效性。虽然已有干细胞治疗改善疼痛和功能的报道,但需要更长期的安全性研究及更多的随机对照试验去验证干细胞治疗椎间盘源性疼痛的安全性和有效性。

关键词：椎间盘源性疼痛干细胞治疗临床研究安全性系统回顾临床试验疼痛评分椎间盘内注射

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