Search results

Data protection requirements heavily increased due to the rising awareness of data security, legal requirements and technological developments. Today, NoSQL databases are increasingly used in security-critical domains. Current survey works on databases and data security only consider authorization and access control in a very general way and do not regard most of today’s sophisticated requirements. Accordingly, the purpose of this paper is to discuss authorization and access control for relational and NoSQL database models in detail with respect to requirements and current state of the art.

This paper follows a systematic literature review approach to study authorization and access control for different database models. Starting with a research on survey works on authorization and access control in databases, the study continues with the identification and definition of advanced authorization and access control requirements, which are generally applicable to any database model. This paper then discusses and compares current database models based on these requirements.

As no survey works consider requirements for authorization and access control in different database models so far, the authors define their requirements. Furthermore, the authors discuss the current state of the art for the relational, key-value, column-oriented, document-based and graph database models in comparison to the defined requirements.

This paper focuses on authorization and access control for various database models, not concrete products. This paper identifies today’s sophisticated – yet general – requirements from the literature and compares them with research results and access control features of current products for the relational and NoSQL database models.

Municipalities have the potential to become models of the circular economy (CE). This paper aims to examine the impact of the municipal council’s characteristics on municipal CE disclosure and promotion.

This paper is based on the resource dependence and upper echelons theories. For a sample of the 100 largest cities in Canada, a mixed methodology is used to code and analyze data and test the hypotheses.

Municipal councillors’ education and experience related to the environment or sustainability are both likely to affect CE disclosure, and their sector membership (public or private) moderates the relationship between CE disclosure and councillors’ experience. This experience may be reinforced by membership in the private sector, which has applied CE principles more extensively than the public sector has. Municipal councils with a greater number of councillors from the private sector appear to perform better in matters of transparency and to disclose more CE information on their public websites.

Municipalities could use the findings to foster their transition to CE by implementing a CE-related training plan for their councillors. A CE-dedicated section on their websites could improve transparency and inform and educate residents about CE.

The public sector could learn from the private sector’s best practices regarding CE.

This paper contributes to the literature by providing empirical evidence of the transparency and engagement of municipalities toward CE. The authors extend the resource dependence and upper echelons theories to a new context, that of public organizations.

This study attempts to assess the readiness of Saudi students for independent/autonomous learning, with a focus on learning of English as a Foreign Language (EFL). The study used a questionnaire and semi-structured interviews to gain insights from a population of 319 students (aged 15-24) about their perceptions of responsibilities, decision-making abilities, motivation, involvement in autonomy-related activities, and capacity to take charge of their own learning. The findings of the study confirmed the relatively low readiness of Saudi EFL learners for independent learning (M = 3.06 on a scale of 1 to 5, SD =.31). Learners demonstrated low responsibility levels, since only 17.27% of them perceived that they accept sole responsibility for their EFL learning. Respondents reported a moderate level of ability (M = 3.63) and motivation (M = 3.70) to learn English. A considerable percentage of participants (27.29%) reported that they are rarely involved in self-directed activities; they demonstrated high levels of teacher dependency and low levels of learner independence. Despite the participants’ reasonable level of awareness of the nature of learner autonomy and its demands, their responses identified them as EFL learners with low autonomy. This study informs EFL learning stakeholders in Saudi Arabia that learners’ readiness for such conditions must be developed before interventions aimed at promoting autonomy are implemented in this context.

.هيتاذ ةروصب ةيزيلجنلإا ةغللا ملعتل نييدوعسلا بلاطلا ةيزهاج ىدم ميقت نأ ةساردلا هذه لواحت تفظونايبتسا ةساردلا ا تلاباقمو رظن ةهجو ىلع لوصحلل319 لوح ابلاط يتاذ لكشب ملعتلل ةيلوئسملا مهلمحت ىدمةيعفادلا ،رارقلا ذاختا ىلع مهتردق ، ةغللا ملعتلةيبنجلاا ةغللا ملعتل نييدوعسلا بلاطلا ةيزهاج فعض ةساردلا جئاتن تتبثا .يتاذ لكشب ملعتلا ىلع ةردقلاو ،ةيتاذلا ةطشنلأا يف ةكراشملا ،يلجنلإا = طسوتم( يتاذ لكشب ةيز3.06 = يرايعم فارحنا ،31. ثيح يتاذ لكشب ملعتلل ةيلوئسملل مهلمحت فعض نوكراشملا تبثا .)تبسن ام ىعداه طقف(17.27 ملعتلا ىلع ةردقلل ةطسوتم تايوتسم نوكراشملا سكع نيح يف كلذل مهلمحت نيكراشملا يلامجا نم )%3.63ةيعفادلاو ) لجنلإا ةغللا ملعتل( ةيزي3.70( نيكراشملا نم ةريبك ةبسن سكعت .)27.83يف مهتكراشم مدع )% يتاذلا ملعتلا ةطشنأ ريبك لكشب دامتعلااولوح نوكراشملا اهادبا يتلا ةطسوتملا تايوتسملا نم مغرلا ىلع .سفنلا ىلع دامتعلاا فعضو ملعملا ىلع فارتعلاا بمهتاباجا نا لاا هتابلطتمو يتاذلا ملعتلا ةيمهأ هذه يصوت .يتاذلا ملعتلل مهتيزهاج مدع تتبثا ةلباقملا ةلئساو نايبتسلاا ىلعلا جمد ةلواحم لبق يتاذلا ملعتلل ةبسانملا ةئيبلا ريفوتب ةيدوعسلا ةيبرعلا ةكلمملا يف ةيزيلجنلإا ةغللا ملعت نع نيلوئسملا ةساردلا يف بلاط .ملعتلا نم عونلا اذه

Authorization and access control have been a topic of research for several decades. However, existing definitions are inconsistent and even contradicting each other. Furthermore, there are numerous access control models and even more have recently evolved to conform with the challenging requirements of resource protection. That makes it hard to classify the models and decide for an appropriate one satisfying security needs. Therefore, this study aims to guide through the plenty of access control models in the current state of the art besides this opaque accumulation of terms meaning and how they are related.

This study follows the systematic literature review approach to investigate current research regarding access control models and illustrate the findings of the conducted review. To provide a detailed understanding of the topic, this study identified the need for an additional study on the terms related to the domain of authorization and access control.

The authors’ research results in this paper are the distinction between authorization and access control with respect to definition, strategies, and models in addition to the classification schema. This study provides a comprehensive overview of existing models and an analysis according to the proposed five classes of access control models.

Based on the authors’ definitions of authorization and access control along with their related terms, i.e. authorization strategy, model and policy as well as access control model and mechanism, this study gives an overview of authorization strategies and propose a classification of access control models providing examples for each category. In contrast to other comparative studies, this study discusses more access control models, including the conventional state-of-the-art models and novel ones. This study also summarizes each of the literature works after selecting the relevant ones focusing on the database system domain or providing a survey, a classification or evaluation criteria of access control models. Additionally, the introduced categories of models are analyzed with respect to various criteria that are partly selected from the standard access control system evaluation metrics by the National Institute of Standards and Technology.

The present quantitative-descriptive study aims to measure the level of English language learning autonomy of the pre-service teachers.

A short list questionnaire developed by Dixon (2011) was administered to 61 pre-service English teachers enrolled in Western Mindanao State University in order to measure their English language learning autonomy. Differences on the levels of English language learning autonomy across participants’ gender, number of languages spoken and first language were also explored.

Results revealed that participants are highly autonomous in English language learning. Gender, number of languages spoken and first language were found to have no significant influence on English language learning autonomy.

Results on the level of English language learning autonomy indicate that pre-service teachers are highly autonomous and, therefore, ready for lifelong learning. This implies pedagogical and instructional advantages, as they can learn and explore the language independently.

Since gender, number of languages spoken and first language do not significantly influence the level of English language learning autonomy, it is suggested that English teachers do not need to develop differentiated instructions and activities anymore, which will cater the three profile variables in fostering autonomous learning, as participants already exhibit a level of autonomy in English language learning.

This would allow teachers and students to be aware of the importance of autonomy in language learning. Thus, it will prepare them to be independent and lifelong learners, as they engage themselves in the professional world.

As one of the Asia’s developing countries, the Philippines have captured a small number of studies and contributions to autonomous learning in the field of research (Madrunio, Tarrayo, Tupas and Valdez, 2016 as cited in Iñigo, 2018). Specifically, there is no research study conducted that measures “language learning autonomy” in the Philippine’s higher education much to the knowledge of the researcher. Thus, this study will be the first one to determine the level of autonomy of pre-service teachers in English language learning in the Philippine context. Furthermore, the present study also intended to determine significant differences on the level of language learning autonomy of pre-service teachers across genders, number of languages spoken and their first language.

This paper describes a two-month summer intensive course designed to introduce participants with a hands-on technical craft on robotics and to acquire experience in the low-level details of embedded systems. Attendants started this course with a brief introduction to robotics; learned to draw, design and create a personalized 3D structure for their mobile robotic platform and developed skills in embedded systems. They were familiarize with the practices used in robotics, learning to connect all sensors and actuator, developing a typical application on differential kinematic using Arduino, exploring ROS features under Raspberry Pi environment and Arduino – Raspberry Pi communication. Different paradigms and some real applications and programming were addressed on the topic of Artificial Intelligence. Throughout the course, participants were introduced to programming languages (including Python and C++), advanced programming concepts such as ROS, basic API development, system concepts such as I2C and UART serial interfaces, PWM motor control and sensor fusion to improve robotic navigation and localization. This paper describes not just the concept, layout and methodology used on RobotCraft 2017 but also presents the participants knowledge background and their overall opinions, leading to focus on lessons learned and suggestions for future editions.