Modeling of systems

The handbook contains the fundamentals of modeling of complex systems. The classification of mathematical models is represented and the methods of their construction are given. The analytical modeling of the basic types of processes in the complex systems is considered. The principles of simulation, statistical and business processes modeling are described. The handbook is oriented on students of higher education establishments that obtain a degree in directions of “Software engineering” and “Computer science” as well as on lecturers and specialists in the domain of computer modeling

Enabling sustainable power distribution networks by using smart grid communications

Smart grid modernization enables integration of computing, information and communications capabilities into the legacy electric power grid system, especially the low voltage distribution networks where various consumers are located. The evolutionary paradigm has initiated worldwide deployment of an enormous number of smart meters as well as renewable energy sources at end-user levels. The future distribution networks as part of advanced metering infrastructure (AMI) will involve decentralized power control operations under associated smart grid communications networks. This dissertation addresses three potential problems anticipated in the future distribution networks of smart grid: 1) local power congestion due to power surpluses produced by PV solar units in a neighborhood that demands disconnection/reconnection mechanisms to alleviate power overflow, 2) power balance associated with renewable energy utilization as well as data traffic across a multi-layered distribution network that requires decentralized designs to facilitate power control as well as communications, and 3) a breach of data integrity attributed to a typical false data injection attack in a smart metering network that calls for a hybrid intrusion detection system to detect anomalous/malicious activities. In the first problem, a model for the disconnection process via smart metering communications between smart meters and the utility control center is proposed. By modeling the power surplus congestion issue as a knapsack problem, greedy solutions for solving such problem are proposed. Simulation results and analysis show that computation time and data traffic under a disconnection stage in the network can be reduced. In the second problem, autonomous distribution networks are designed that take scalability into account by dividing the legacy distribution network into a set of subnetworks. A power-control method is proposed to tackle the power flow and power balance issues. Meanwhile, an overlay multi-tier communications infrastructure for the underlying power network is proposed to analyze the traffic of data information and control messages required for the associated power flow operations. Simulation results and analysis show that utilization of renewable energy production can be improved, and at the same time data traffic reduction under decentralized operations can be achieved as compared to legacy centralized management. In the third problem, an attack model is proposed that aims to minimize the number of compromised meters subject to the equality of an aggregated power load in order to bypass detection under the conventionally radial tree-like distribution network. A hybrid anomaly detection framework is developed, which incorporates the proposed grid sensor placement algorithm with the observability attribute. Simulation results and analysis show that the network observability as well as detection accuracy can be improved by utilizing grid-placed sensors. Conclusively, a number of future works have also been identified to furthering the associated problems and proposed solutions

Proceedings of the Seventh Annual Software Engineering Workshop

The Software Engineering Laboratory, software tools, software errors and cost estimation are addressed

The perspectives of female Emirati pre-service teachers on the use of English as a medium of instruction: An ethnographic investigation

This qualitative study examines an era in the history of English education in Abu Dhabi, the United Arab Emirates (UAE) by investigating the perspectives of English offered by 16 female Emirati pre-service teachers. As important stakeholders of education reform, these Emirati women are on the cusp of a linguistic transformation: They are learning in English while preparing to use English as a medium of instruction in classrooms of their own. Within an Arabian context characterised by dynamic change, conceptions of English and how it should be used in relation to Arabic have, undoubtedly, shifted in status and focus. This study explores the complex and diverse ways English is conceptualised and used by Emirati pre-service teachers during a particular phase of educational reforms shaped by expectations of bi-literacy in English and Arabic.This study has two main research questions. They are: 1) What are Emirati pre-service teachers’ conceptions of English in light of its use as a medium of instruction? 2) What are the social influences mediating their conceptions of English? This study, conceptualized as an unfolding, exploratory study, draws on ethnographic methods across three phases of data collection: focus group discussions, participant observations and ethnographic interviews. It also relies on theoretical assumptions about the role of language in the construction of knowledge across diffferent phases of learning, as set by Berger and Luckman (1971). The findings shared in this study shed light on the meanings Emirati pre-service teachers have of English in light of its use as a medium of instruction and the social influences mediating their conceptions. The study offers two main contributions to the field. The first includes a report on the range of ways that English and Arabic are used, modified and incorporated into the participants’ linguistic repertoires, showing that the use of EMI reflects several discrete types of conversational practices. The second contribition highlights awareness of a rich linguistic backdrop. In Abu Dhabi, English and Arabic constitute foregrounded roles in a diverse and multilingual capital city where other languages are experienced and ranked in social importance. The findings conclude that English is regarded as more than a resource serving pragmatic purposes and creative impulses, English is also seen as a feature of Abu Dhabi as a social space. The themes shared in this study are intended to promote clarity of the sociolinguistic dynamics of a particular sub-group of Emirati pre-service teachers and their understandings of the use of English as a medium of instruction in higher education and stimulate discussion about the ways in which English is integrated into daily life on this peninsula in the Arabian Gulf

Reports to the President

A compilation of annual reports for the 1999-2000 academic year, including a report from the President of the Massachusetts Institute of Technology, as well as reports from the academic and administrative units of the Institute. The reports outline the year's goals, accomplishments, honors and awards, and future plans

Future Teachers, Future Perspective - The Story of English in Kuwait

In Kuwait, the English language is increasingly gaining importance signifying globalisation and internationalisation of the local culture and linguistic environment. Alongside the positive effects of the wide-spread usage of English there are negative tendencies which emerge onto the scene. This thesis is concerned with the educational aspects of such influences where it explored trainee teachers’ conceptualisations of English as an international / global language, and examined the implications of current views of English for teacher preparation in light of the most recent methodological trends such as global English delivery, expansion of teacher knowledge base, the introduction of linguistic rights and instructional policies to educational stakeholders, and the merging of language and culture in English language teaching. Through questionnaires and in-depth interviews the study found that the relationship between the local and global in Kuwait is a complex issue with social, educational and political implications. Multiple functions for English and its status within the local context were voiced and consequently alternative futures for Standard Arabic as the main source and medium of local literacy and language of academia against the background of rapid Anglicisation emerged. The results may attract the attention of Kuwait’s educational theorists and practitioners, and the hopeful outcome would be to inspire teachers to engage in critical thinking and challenge their realities; and encourage Kuwait’s educational policy makers to find a balance between the source and target languages/cultures, as well as bring to the foreground local expertise and knowledge

The Investigation of Possible Errors in Equivalencing Models of Mass Service Systems with Heterogeneous Requests

The purpose of this paper is to calculate the output flow parameters in networks of mass service systems with heterogeneities, while replacing precise models with equivalent ones. An analysis of the approximate methods for calculating mass service systems’ parameters that take the heterogeneity of the requests into account is carried out in this paper. A simple comparison of the output flow parameters in elementary service systems including one device and considering the service heterogeneity of homogeneous service systems is performed in the beginning of the paper. The

The Investigation of Possible Errors in Equivalencing Models of Mass Service Systems with Heterogeneous Requests

The purpose of this paper is to calculate the output flow parameters in networks of mass service systems with heterogeneities, while replacing precise models with equivalent one

Social inequality before farming? Multidisciplinary approaches to the study of social organization in prehistoric and ethnographic hunter-gatherer-fisher societies

Archaeological investigations over the past 50 years have challenged the importance of domestication and food production in the emergence of institutionalized social inequality. Social inequality in the prehistoric human past developed through multiple historical processes that operate on a number of different scales of variability (e.g. social, economic, demographic, and environmental). However, in the theoretical and linguistic landscape of social inequality, there is no clear definition of what social inequality is. The lifeways of hunter-gathererfisher societies open a crucial intellectual space and challenge to find meaningful ways of using archaeological and ethnographic data to understand what social inequality exactly is with regard to variously negotiated or enforced cultural norms or ethoses of individual autonomy. This interdisciplinary edited volume gathers together researchers working in the fields of prehistoric archaeology and cultural and evolutionary anthropology. Spanning terminal Pleistocene to Holocene archaeological and ethnographic contexts from across the globe, the nineteen chapters in this volume cover a variety of topics organized around three major themes, which structure the book: 1) social inequality and egalitarianism in extant hunter-gatherer societies; 2) social inequality in Upper Palaeolithic Europe (c. 45,000–11,500 years ago); 3) social inequality in prehistoric Holocene hunter-gatherer-fisher societies globally. Most chapters in this volume provide empirical content with considerations of subsistence ecology, demography, mobility, social networks, technology, children’s enculturation, ritual practice, rock art, dogs, warfare, lethal weaponry, and mortuary behaviour. In addition to providing new data from multiple contexts through space and time, and exploring social diversity and evolution from novel perspectives, the collection of essays in this volume will have a considerable impact on how archaeologists define and theorize pathways both towards and away from inequality within diverse social contexts