Distributed Real-time Systems - Deterministic Protocols for Wireless Networks and Model-Driven Development with SDL

In a networked system, the communication system is indispensable but often the weakest link w.r.t. performance and reliability. This, particularly, holds for wireless communication systems, where the error- and interference-prone medium and the character of network topologies implicate special challenges. However, there are many scenarios of wireless networks, in which a certain quality-of-service has to be provided despite these conditions. In this regard, distributed real-time systems, whose realization by wireless multi-hop networks becomes increasingly popular, are a particular challenge. For such systems, it is of crucial importance that communication protocols are deterministic and come with the required amount of efficiency and predictability, while additionally considering scarce hardware resources that are a major limiting factor of wireless sensor nodes. This, in turn, does not only place demands on the behavior of a protocol but also on its implementation, which has to comply with timing and resource constraints. The first part of this thesis presents a deterministic protocol for wireless multi-hop networks with time-critical behavior. The protocol is referred to as Arbitrating and Cooperative Transfer Protocol (ACTP), and is an instance of a binary countdown protocol. It enables the reliable transfer of bit sequences of adjustable length and deterministically resolves contest among nodes based on a flexible priority assignment, with constant delays, and within configurable arbitration radii. The protocol's key requirement is the collision-resistant encoding of bits, which is achieved by the incorporation of black bursts. Besides revisiting black bursts and proposing measures to optimize their detection, robustness, and implementation on wireless sensor nodes, the first part of this thesis presents the mode of operation and time behavior of ACTP. In addition, possible applications of ACTP are illustrated, presenting solutions to well-known problems of distributed systems like leader election and data dissemination. Furthermore, results of experimental evaluations with customary wireless transceivers are outlined to provide evidence of the protocol's implementability and benefits. In the second part of this thesis, the focus is shifted from concrete deterministic protocols to their model-driven development with the Specification and Description Language (SDL). Though SDL is well-established in the domain of telecommunication and distributed systems, the predictability of its implementations is often insufficient as previous projects have shown. To increase this predictability and to improve SDL's applicability to time-critical systems, real-time tasks, an approved concept in the design of real-time systems, are transferred to SDL and extended to cover node-spanning system tasks. In this regard, a priority-based execution and suspension model is introduced in SDL, which enables task-specific priority assignments in the SDL specification that are orthogonal to the static structure of SDL systems and control transition execution orders on design as well as on implementation level. Both the formal incorporation of real-time tasks into SDL and their implementation in a novel scheduling strategy are discussed in this context. By means of evaluations on wireless sensor nodes, evidence is provided that these extensions reduce worst-case execution times substantially, and improve the predictability of SDL implementations and the language's applicability to real-time systems

Linguistic complexity of arabic language: a semantic analysis of antonymous homonyms in the holy Qur'ān

Homonymy, is one of the two main sub-divisions of lexical ambiguity that represents the complex nature of form and context of the Qur'anic Arabic which presents a challenge in the translation process. Since Qur'anic discourse abounds with homonymic expressions whose meaning is derived from the context, the translators of the Qur'an should undertake a demanding task decoding the intended meanings. The present paper aims at clarifying some linguistic complexities in some verses of the Qur'ān which may pose difficulty to translators of the holy book most especially those who are not familiar with antonymous homonyms in Arabic language. The reason is that antonymous homonyms are special features of the Qurʾanic Arabic language. It may be viewed as one of the stylistic feature of the Qur'an. Therefore, classification of these linguistic complexity is offered and the samples of these classifications from the Holy Qur'ān are mentioned in relation to antonymous homonyms. Samples of translated Qur'an are compared in order to ascertain the qualities of translations and English translation strategies of the stated verses

Understanding student nurse learning: a comparative study of learning through nurse education programmes for the Republic of Ireland and Northern Ireland

There is an increasing emphasis on accountability in all public services, which in nursing is based on the desired political objective of aligning nursing more closely with the goals of health services. This study fundamentally is derived from the increasing demand for economic models of nurse education as a process within a wider economic agenda which converts inputs (example training costs) into outputs (example registered nurses). This thesis provides an understanding of student nurse learning as it occurs through nurse education programmes for the Republic of Ireland and Northern Ireland. A research design of triangulation including quantitative and qualitative measures was utilised to provide a greater breadth and depth of understanding on contrasting philosophies, objectives and practices arising trom the two different models of nurse education. The cohort included all student nurses (1122) who commenced a nurse education and training programme m October 1991 m the Republic ot Ireland (714 nurse student nurses) and Northern Ireland (408 students nurses). The findings demonstrate significant differences in regard to learning between student nurses from Northern Ireland and between student nurses from general, psychiatric, mental handicap and sick childrens, m the Republic of Ireland and between younger and older student nurses. The study does however, identify a number of key factors which emerged from all measurements and transcended all programmes and therefore appear to be fundamental to student nurse learning. These are presented as a twelve factor heuristic model of student nurse learning. The central tenet of the study is that student nurse learning is context dependent Students’ constructs of learning are dependent on their interpretation of the demands of the task, influenced by the assessment and teaching, their previous knowledge, experience and personal characteristics. It is concluded that the profession of nursing must be deliberate m pursuing quality learning in nurse education and must be determined in its explicit procurement of the type of education desirable for the futuie practice of nursing

1980-1981 Bulletin

Volume LXXXXI, Number 1 Scanned from the copy held in the Registrar\u27s Office.https://ecommons.udayton.edu/bulletin_grad/1034/thumbnail.jp

Optimisation and Decision Support during the Conceptual Stage of Building Design

Merged with duplicate record 10026.1/726 on 28.02.2017 by CS (TIS)Modern building design is complex and involves many different disciplines operating in a fragmented manner. Appropriate computer-based decision support (DS) tools are sought that can raise the level of integration of different activities at the conceptual stage, in order to help create better designs solutions. This project investigates opportunities that exist for using techniques based upon the Genetic Algorithm (GA) to support critical activities of conceptual building design (CBD). Collective independent studies have shown that the GA is a powerful optimisation and exploratory search technique with widespread application. The GA is essentially very simple yet it offers robustness and domain independence. The GA efficiently searches a domain to exploit highly suitable information. It maintains multiple solutions to problems simultaneously and is well suited to non-linear problems and those of a discontinuous nature found in engineering design. The literature search first examines traditional approaches to supporting conceptual design. Existing GA techniques and applications are discussed which include pioneering studies in the field of detailed structural design. Broader GA studies are also reported which have demonstrated possibilities for investigating geometrical, topological and member size variation. The tasks and goals of conceptual design are studied. A rationale is introduced, aimed at enabling the GA to be applied in a manner that provides the most effective support to the designer. Numerical experiments with floor planning are presented. These studies provide a basic foundation for a subsequent design support system (DSS) capable of generating structural design concepts. A hierarchical Structured GA (SGA) created by Dasgupta et al [1] is investigated to support the generation of diverse structural design concepts. The SGA supports variation in the size, shape and structural configuration of a building and in the choice of structural frame type and floor system. The benefits and limitations of the SGA approach are discussed. The creation of a prototype DSS system, abritrarily called Designer-Pro (DPRO), is described. A detailed building design model is introduced which is required for design development and appraisal. Simplifications, design rationale and generic component modelling are mentioned. A cost-based single criteria optimisation problem (SCOP) is created in which other constraints are represented as design parameters. The thesis describes the importance of the object-oriented programming (OOP) paradigm for creating a versatile design model and the need for complementary graphical user interface (GUI) tools to provide human-computer interaction (HCI) capabilities for control and intelligent design manipulation. Techniques that increase flexibility in the generation and appraisal of concept are presented. Tools presented include a convergence plot of design solutions that supports cursor-interrogation to reveal the details of individual concepts. The graph permits study of design progression, or evolution of optimum design solutions. A visualisation tool is also presented. The DPRO system supports multiple operating modes, including single-design appraisal and enumerative search (ES). Case study examples are provided which demonstrate the applicability of the DPRO system to a range of different design scenarios. The DPRO system performs well in all tests. A parametric study demonstrates the potential of the system for DS. Limitations of the current approach and opportunities to broaden the study form part of the scope for further work. Some suggestions for further study are made, based upon newly-emerging techniques

Issues Related to Implementing High-Fidelity Simulation in a Nursing Program

Due to the shortage of clinical sites, nursing educators, deans, and directors are compelled to implement alternative clinical solutions such as high-fidelity simulation (HFS). The problem is that nursing educators are often not prepared to implement HFS as a teaching strategy. Faculty readiness is imperative for a successful simulation program and student outcomes. Therefore, the purpose of this study was to investigate the perceptions and practices of faculty, deans, and directors on the implementation of HFS across the nursing curriculum. Kolb\u27s experiential learning theory provided the theoretical support for both the teaching and learning required by faculty for a successful simulation program. The key research question was to investigate how nursing educators perceived the implementation of HFS across the curriculum and how nursing deans and directors provided support for integrating HFS throughout the curriculum. The study population included 13 nursing faculty and 7 deans using simulation at prelicensure programs. Data collection included interviews, observations of simulation labs, and document analysis. Data were analyzed using open and priori coding. Five themes emerged relating to need for faculty development, need for time, need for resources, need for space, and need for support. These findings were consistent with the literature. Based on the findings, a professional development program in simulation pedagogy was developed. The faculty development program could lead to a positive social change by reducing barriers and increasing the use of simulation. Increasing the use of simulation allows nursing students to practice clinical reasoning skills and gain confidence and competence with the goal of improving patient outcomes

Design revolutions: IASDR 2019 Conference Proceedings. Volume 2: Living, Making, Value

In September 2019 Manchester School of Art at Manchester Metropolitan University was honoured to host the bi-annual conference of the International Association of Societies of Design Research (IASDR) under the unifying theme of DESIGN REVOLUTIONS. This was the first time the conference had been held in the UK. Through key research themes across nine conference tracks – Change, Learning, Living, Making, People, Technology, Thinking, Value and Voices – the conference opened up compelling, meaningful and radical dialogue of the role of design in addressing societal and organisational challenges. This Volume 2 includes papers from Living, Making and Value tracks of the conference