How to repair the Hill cipher     

ISMAIL I.A. AMIN Mohammed DIAB Hossam 《浙江大学学报(A卷英文版)》2006,7(12):2022-2030

INTRODUCTION Owing to the advance in network technology, information security is an increasingly important problem. Popular application of multimedia tech- nology and increasingly transmission ability of net- work gradually leads us to acquire information di- rectly and clearly through images. Hence, data secu- rity has become a critical and imperative issue. Hill cipher is a block cipher that has several advantages such as disguising letter frequencies of the plaintext, its simplicity be…  相似文献   

English,Israeli‐Arab and Saudi Arabian Adolescent Values     

Cyril Simmons  Christine Simmons  Mohammed Habib Allah 《Educational studies》1994,20(1):69-86

This paper compares the results of three surveys. The subjects comprise 96 adolescents in an English comprehensive school, 118 Arab adolescents in three schools in Israel and 89 adolescents in two schools in Saudi Arabia. The first and last groups of subjects have a modal age of 14 years whereas the majority of the second group are 15 years of age. The open‐ended questionnaire comprised 10 prompts designed to elicit responses concerning ideals and least ideals, most and least preferred companions, use of solitude, summum bonum, most and least desired outcomes to life and nascent philosophies. Two methods of analysis were used. First, references to dominant themes were totalled; secondly, responses were assigned to six categories according to the dominant values expressed from materialistic to altruistic. Similarities but also significant differences were found in the dominant themes and significant differences were also apparent in the values that were expressed. Most marked was the high value placed on parents and friendship by the English young people, the importance attached to education by the Israeli‐Arab group and the prominence given to Islam by the Saudi Arabian adolescents.  相似文献   

The Kingdom of Saudi Arabia: teaching resources and the role of faculties of education in educational development     

Dr Mohammed A. Rasheed 《欧洲师范教育杂志》1984,7(2):117-126

Dr Rasheed provides an overview of school provision in the Kingdom of Saudi Arabia and identifies the main problems of teacher provision. These are seen as a continuing shortage of adequately qualified Saudi teachers and a consequent over‐reliance on expatriates. He then goes on to consider the function and role of teacher training in the development of the national system of education.  相似文献   

Using an iterative mixed-methods research design to investigate schools facing exceptionally challenging circumstances within Trinidad and Tobago     

Jerome De Lisle  Krishna Seunarinesingh  Rhoda Mohammed  Rinnelle Lee-Piggott 《School Effectiveness & School Improvement》2017,28(3):406-442

In this study, methodology and theory were linked to explicate the nature of education practice within schools facing exceptionally challenging circumstances (SFECC) in Trinidad and Tobago. The research design was an iterative quan>QUAL-quan>qual multi-method research programme, consisting of 3 independent projects linked together by overall purpose. Although large-scale quantitative data were first used to identify and describe SFECC, the overall programme was driven by an inductive theoretical thrust, with findings from the multiple-site case studies of Projects 2 and 3 used to construct substantive theory on SFECC. The integrated findings point to the pervasive role of beyond-school factors, which were magnified and intertwined with between- and within-school factors. SFECC in this study found great difficulty transcending states of chronic low performance. We hypothesized on the need for transformative school leadership, but in this context, greater external support by stakeholder agencies and broad place-based strategies appeared essential for turnaround.  相似文献   

Exploring Science Teachers’ Affective States: Pedagogical Discontentment,Self-efficacy,Intentions to Reform,and Their Relationships     

Ajda Kahveci  Murat Kahveci  Nasser Mansour  Maher Mohammed Alarfaj 《Research in Science Education》2018,48(6):1359-1386

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Development and evaluation of an interactive electronic laboratory manual for cooperative learning of medical histology     

Mohammed K. Khalil  Debbie L. Kirkley  Jonathan D. Kibble 《Anatomical sciences education》2013,6(5):342-350

This article describes the development of an interactive computer‐based laboratory manual, created to facilitate the teaching and learning of medical histology. The overarching goal of developing the manual is to facilitate self‐directed group interactivities that actively engage students during laboratory sessions. The design of the manual includes guided instruction for students to navigate virtual slides, exercises for students to monitor learning, and cases to provide clinical relevance. At the end of the laboratory activities, student groups can generate a laboratory report that may be used to provide formative feedback. The instructional value of the manual was evaluated by a questionnaire containing both closed‐ended and open‐ended items. Closed‐ended items using a five‐point Likert‐scale assessed the format and navigation, instructional contents, group process, and learning process. Open‐ended items assessed student's perception on the effectiveness of the manual in facilitating their learning. After implementation for two consecutive years, student evaluation of the manual was highly positive and indicated that it facilitated their learning by reinforcing and clarifying classroom sessions, improved their understanding, facilitated active and cooperative learning, and supported self‐monitoring of their learning. Anat Sci Educ 6: 342–350. © 2013 American Association of Anatomists.  相似文献   

Rural Youths' Participation in Agriculture: Prospects,Challenges and the Implications for Policy in Nigeria     

Sarah Jehu Auta  Yusuf M. Abdullahi  Mohammed Nasiru 《The Journal of Agricultural Education and Extension》2013,19(3):297-307

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The automation of academic and special libraries in Nigeria: the state of the art     

Zakari Mohammed 《International Information and Library Review》2013,45(2):65-72

The paper examines the state of library automation in academic and special libraries in Nigeria. As a background, an attempt was made to present efforts made by different bodies and institutions in the country to automate their entire library systems. Also disclosed are the reasons why the libraries opted for automated systems, the successes achieved by some of the libraries in automating their systems, and the problems faced by the libraries who succeeded in automating some of their systems as well as those who are still in the process of doing so. Considering the fact that the automation of library systems in Nigeria has spread from academic and special libraries to the public, and there are also a number of companies/institutions engaged in the provision and servicing of computer hardware and software including management information systems, the paper concluded that the future of library automation in the country is bright.  相似文献   

Urinary Tumor Markers Could Predict Survival in Bladder Carcinoma     

Ragaa H. M. Salama  Tahia H. Selem  Mohammed El-Gammal  Abd-elmoneim A. Elhagagy  Sally M. Bakar 《Indian journal of clinical biochemistry : IJCB》2013,28(3):265-271

The early diagnosis of bladder cancer is important for effective treatment of the disease. This study aimed to evaluate the nuclear matrix protein 22 (NMP 22), soluble epithelial cadherin (E-cadherin), cathepthin-D and total protein with clinico-pathological features of bladder cancer, and to determine the relation between each marker and tumor progression after treatment. The study includes 65 patients with bladder cancer, 14 benign urinary diseases and 11 healthy volunteers. Patients were categorized according to bilharzial infestation, T stage, tumor grade, size and the presence of lymph node metastasis. Forty patients were followed for disease progression after surgery. There was a significant increase of NMP22, E-cadherin, cathepthin-D and total protein detected in cancer group compared to healthy and benign groups. It was found that NMP 22 and E-cadherin had highest sensitivity (84.4, 76.9 %, respectively) while, total ddedprotein showed highest specificity (77.4 %). Tumor size correlated with urinary NMP22 (r = 0.3, p = 0.02), although, E-cadherin, cathepsin-D and total protein correlated with tumor size (r = 0.3, 0.28, 0.2; p = 0.01, p = 0.01, 0.04, respectively) and lymph node metastasis (r = 0.32, 0.34, 0.2; p = 0.003, 0.005, 0.04, respectively). Elevated pretreatment urinary NMP22, E-cadherin and total protein levels was associated significantly with bladder cancer recurrence (p = 0.02, 0.001, 0.005, respectively). In conclusion, determination of urinary NMP22, E-cadherin and total protein in bladder cancer patients or persons at risk of developing bladder cancer will help in early detection of the disease and prediction of recurrence. The use of a combination of tumor markers is markedly useful than the assessment of single one.  相似文献   

Assessment of Some Biochemical Oxidative Stress Markers in Male Smokers with Chronic Periodontitis     

Abdul Samad Aziz  Madhav Govind Kalekar  Adinath Narayan Suryakar  Tabita Benjamin  Milsee Jaya Prakashan  Bijle Mohammed Nadeem Ahmed  Mehmood Sayyad 《Indian journal of clinical biochemistry : IJCB》2013,28(4):374-380

The present study aims to assess and compare the biochemical oxidative stress markers in male smokers and non-smokers with chronic periodontitis. One hundred thirty-four male chronic periodontitis patients and 64 apparently healthy male volunteers were recruited for the study. The periodontal status was evaluated by measuring gingival index, plaque index, papillary bleeding index and clinical attachment loss using UNC-15 probe. The biochemical markers estimated were total antioxidant capacity, RBC-superoxide dismutase, glutathione peroxidase, vitamin C, malondialdehyde and C-reactive protein. The obtained results indicate higher oxidative stress in chronic periodontitis. Smokers with chronic periodontitis show significantly higher periodontal clinical parameters and relatively higher systemic oxidative stress. Vitamin C estimation may be an important biochemical parameter in conjunction with clinical parameters for diagnosis of chronic periodontitis in smokers.  相似文献