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Abdul Rahman 서울대학교 교육연구소 2019 Asia Pacific Education Review Vol.20 No.4
This paper argues that the professional learning of teachers is shaped and conditioned by the circumstances, arrangements, and specificity of teacher professional development (TPD) learning activities or programs of a particular context or system. Specifically, this research reveals how practices of TPD programs in Indonesia influence teachers’ professional learning perceptions and practices. This research draws on a larger multiple-case-study research that looks into the influences, and possible interplay, of teacher characteristics, TPD learning activities, and schools on teacher professional learning in Indonesia. This paper reports findings of the research question that investigates teachers’ perception towards TPD learning activities that they have been involved in during the 18-month period prior to participating in the research project. The results show that teachers participate in various forms/types of TPD learning activities that can be (1) formal, designed, and mandated by parties external to teachers; (2) informal, voluntary, and incidental, arising from teachers’ daily practices and interpersonal communication and interaction with others; and (3) can also be either personal or collaborative as a professional learning undertaking. “Restrictive” and “facilitative” TPD are the two conflicting themes that represent the influences of practices of TPD programs in Indonesia.
Abdulrahman Al-Ahmari,Mohammad Ashfaq,Abdullah Alfaify,Basem Abdo,Abdulrahman Alomar,Abdelnaser Dawud 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
Electron beam melting (EBM) has been found to be a promising technology for producing complex shaped parts from gamma titaniumaluminide alloys (γ-TiAl). The parts produced by this process are projected to have dimensions very close to the desired final shapes. However, the surface roughness of the parts produced by EBM is excessively rough. In many applications, it is necessary to improve thequality of manufactured parts using a convenient post process. This paper determines process parameters of end milling when it is usedas a post process for the parts produced by EBM. Design of experiments has been used to study the effect of the selected input parametersof end milling (spindle speed, feed rate, depth of cut and coolant type) on the surface roughness of γ-TiAl parts. Response surface methodologyis used to develop a predictive model for surface roughness. Effects of the selected milling process are investigated. This paperalso optimizes the selected process parameters to minimize the value of the obtained surface roughness.
Abdulrahman Y. Almansouri,Mohammed E. Abdulfatah,Omar H. Baaqil,Alaa A. Bakheet,Sarah A. Turki,Mamdouh M. Kotb,Alaa Althubaiti,Majed M. Almaghrabi,Abdulrahman M. Althubaiti,Badr M. Madani,Ali S. M. Ja 대한골대사학회 2016 대한골대사학회지 Vol.23 No.1
Background: The aim of the study was to compare serum sclerostin levels in human immunodeficiency virus (HIV)-infected patients and healthy controls, and to evaluate their relationship with bone turnover markers (BTM) and bone mineral density (BMD). Methods: We prospectively studied 33 HIV treatment-naive patients and 63 healthy individuals; match ed for age and sex. Serum sclerostin levels, BTM, BMD were measured. Viral load and cluster of differentiation 4 (CD4) levels were also assessed in HIV-infected patients. Results: The mean±standard deviation (SD) age of sample was 37.6±10.3 years (range, 19 to 59 years). Of the 96 subjects, 58 (60.4%) were male and 38 (39.6%) were female. Infection with HIV is associated with significant reduction in serum sclerostin levels (HIV-infected: 39.4±28.3 vs. non HIV: 76.6±15.7 pmol/L; P<0.001) and a decrease in BMD at femoral neck and lumbar spine compared to healthy controls. Sclerostin however was not correlated with BMD and was not related to age, generally a strong correlation. There were no significant correlations between sclerostin and BTM (P>0.05). Conclusions: These findings suggest that untreated HIV and the resulting immune deficiency and/or systemic inflammation could be an important regulator of serum sclerostin in this population.
Influence of operator's experience level on lifespan of the WaveOne Primary file in extracted teeth
Abdulrahman Mohammed Saleh,,Saeid Tavanafar,,Pouyan Vakili-Gilani,Noor Jamal Al Sammerraie,Faahim Rashid 대한치과보존학회 2013 Restorative Dentistry & Endodontics Vol.38 No.4
Objectives: The aim of this study was to assess the influence of operator experiencelevel on the lifespan of the WaveOne Primary file (Dentsply Maillefer, Ballaigues,Switzerland) in extracted teeth. Materials and Methods: Moderately curved canals ofextracted maxillary and mandibular molars were randomly distributed into 2 groups:experienced and inexperienced operators. Ten files were allocated to each group (n =10). Each canal was prepared until the working length was reached, and the same filewas used to prepare additional canals until it separated. The number of canals preparedbefore file separation was recorded. The fragment length of each file was measured,and the location of the fragment in the canal was determined. Data were statisticallyanalysed using the independent 2-sample t-test. Results: The 2 operators prepared atotal of 324 moderately curved canals of maxillary and mandibular molars. There wasno significant intergroup difference in the mean number of canals prepared (p = 0.27). The average lifespan of the WaveOne Primary file was 17.1 and 15.3 canals, and thelongest lifespan was 25 and 20 canals, when used by experienced and inexperiencedoperators, respectively. There were no statistically significant intergroup differencesin separated fragment length and location. Conclusions: Within the limitations ofthis study, operator experience level appears to have no effect on the lifespan of theWaveOne Primary file in preparation of moderately curved canals. Single teeth withmultiple canals can be prepared safely even by a novice operator by using a single file.
Intelligent Android Malware Detection Using Radial Basis Function Networks and Permission Features
Abdulrahman, Ammar,Hashem, Khalid,Adnan, Gaze,Ali, Waleed International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.6
Recently, the quick development rate of apps in the Android platform has led to an accelerated increment in creating malware applications by cyber attackers. Numerous Android malware detection tools have utilized conventional signature-based approaches to detect malware apps. However, these conventional strategies can't identify the latest apps on whether applications are malware or not. Many new malware apps are periodically discovered but not all malware Apps can be accurately detected. Hence, there is a need to propose intelligent approaches that are able to detect the newly developed Android malware applications. In this study, Radial Basis Function (RBF) networks are trained using known Android applications and then used to detect the latest and new Android malware applications. Initially, the optimal permission features of Android apps are selected using Information Gain Ratio (IGR). Appropriately, the features selected by IGR are utilized to train the RBF networks in order to detect effectively the new Android malware apps. The empirical results showed that RBF achieved the best detection accuracy (97.20%) among other common machine learning techniques. Furthermore, RBF accomplished the best detection results in most of the other measures.
Abdulrahman A. Alhailaa,Saad AAl-Nazhan,Mazen A Aldosimani The Korean Academy of Conservative Dentistry 2024 Restorative Dentistry & Endodontics Vol.49 No.1
Objectives: This cross-sectional study evaluated the prevalence of apical periodontitis (AP) and the technical quality of root canal fillings in an adult Kuwaiti subpopulation using cone-beam computed tomography (CBCT) images. Materials and Methods: Two experienced examiners analyzed 250 CBCT images obtained from Kuwaiti patients aged 15-65 years who attended government dental specialist clinics between January 2019 and September 2020. The assessment followed the radiographic scoring criteria proposed by De Moor for periapical status and the technical quality of root canal filling. Chi-square and Fisher's exact tests were used for statistical analysis, with significance level set at p < 0.05. Results: Among the 2,762 examined teeth, 191 (6.91%) exhibited radiographic signs of AP, and 176 (6.37%) had undergone root canal filling. AP prevalence in root canal-treated teeth was 32.38%, with a significant difference between males and females. Most of the endodontically treated teeth exhibited adequate root canal filling (71.5%). Conclusions: The study demonstrated a comparable prevalence of AP and satisfactory execution of root canal treatment compared to similar studies in different countries.