5,717 research outputs found

    Analysis and Design of Non-Orthogonal Multiple Access (NOMA) Techniques for Next Generation Wireless Communication Systems

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    The current surge in wireless connectivity, anticipated to amplify significantly in future wireless technologies, brings a new wave of users. Given the impracticality of an endlessly expanding bandwidth, there’s a pressing need for communication techniques that efficiently serve this burgeoning user base with limited resources. Multiple Access (MA) techniques, notably Orthogonal Multiple Access (OMA), have long addressed bandwidth constraints. However, with escalating user numbers, OMA’s orthogonality becomes limiting for emerging wireless technologies. Non-Orthogonal Multiple Access (NOMA), employing superposition coding, serves more users within the same bandwidth as OMA by allocating different power levels to users whose signals can then be detected using the gap between them, thus offering superior spectral efficiency and massive connectivity. This thesis examines the integration of NOMA techniques with cooperative relaying, EXtrinsic Information Transfer (EXIT) chart analysis, and deep learning for enhancing 6G and beyond communication systems. The adopted methodology aims to optimize the systems’ performance, spanning from bit-error rate (BER) versus signal to noise ratio (SNR) to overall system efficiency and data rates. The primary focus of this thesis is the investigation of the integration of NOMA with cooperative relaying, EXIT chart analysis, and deep learning techniques. In the cooperative relaying context, NOMA notably improved diversity gains, thereby proving the superiority of combining NOMA with cooperative relaying over just NOMA. With EXIT chart analysis, NOMA achieved low BER at mid-range SNR as well as achieved optimal user fairness in the power allocation stage. Additionally, employing a trained neural network enhanced signal detection for NOMA in the deep learning scenario, thereby producing a simpler signal detection for NOMA which addresses NOMAs’ complex receiver problem

    Digitalization and Development

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    This book examines the diffusion of digitalization and Industry 4.0 technologies in Malaysia by focusing on the ecosystem critical for its expansion. The chapters examine the digital proliferation in major sectors of agriculture, manufacturing, e-commerce and services, as well as the intermediary organizations essential for the orderly performance of socioeconomic agents. The book incisively reviews policy instruments critical for the effective and orderly development of the embedding organizations, and the regulatory framework needed to quicken the appropriation of socioeconomic synergies from digitalization and Industry 4.0 technologies. It highlights the importance of collaboration between government, academic and industry partners, as well as makes key recommendations on how to encourage adoption of IR4.0 technologies in the short- and long-term. This book bridges the concepts and applications of digitalization and Industry 4.0 and will be a must-read for policy makers seeking to quicken the adoption of its technologies

    Facilitating prosociality through technology: Design to promote digital volunteerism

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    Volunteerism covers many activities involving no financial rewards for volunteers but which contribute to the common good. There is existing work in designing technology for volunteerism in HumanComputer Interaction (HCI) and related disciplines that focuses on motivation to improve performance, but it does not account for volunteer wellbeing. Here, I investigate digital volunteerism in three case studies with a focus on volunteer motivation, engagement, and wellbeing. My research involved volunteers and others in the volunteering context to generate recommendations for a volunteer-centric design for digital volunteerism. The thesis has three aims: 1. To investigate motivational aspects critical for enhancing digital volunteers’ experiences 2. To identify digital platform attributes linked to volunteer wellbeing 3. To create guidelines for effectively supporting volunteer engagement in digital volunteering platforms In the first case study I investigate the design of a chat widget for volunteers working in an organisation with a view to develop a design that improves their workflow and wellbeing. The second case study investigates the needs, motivations, and wellbeing of volunteers who help medical students improve their medical communication skills. An initial mixed-methods study was followed by an experiment comparing two design strategies to improve volunteer relatedness; an important indicator of wellbeing. The third case study looks into volunteer needs, experiences, motivations, and wellbeing with a focus on volunteer identity and meaning-making on a science-based research platform. I then analyse my findings from these case studies using the lens of care ethics to derive critical insights for design. The key contributions of this thesis are design strategies and critical insights, and a volunteer-centric design framework to enhance the motivation, wellbeing and engagement of digital volunteers

    A survey on reconfigurable intelligent surfaces: wireless communication perspective

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    Using reconfigurable intelligent surfaces (RISs) to improve the coverage and the data rate of future wireless networks is a viable option. These surfaces are constituted of a significant number of passive and nearly passive components that interact with incident signals in a smart way, such as by reflecting them, to increase the wireless system's performance as a result of which the notion of a smart radio environment comes to fruition. In this survey, a study review of RIS-assisted wireless communication is supplied starting with the principles of RIS which include the hardware architecture, the control mechanisms, and the discussions of previously held views about the channel model and pathloss; then the performance analysis considering different performance parameters, analytical approaches and metrics are presented to describe the RIS-assisted wireless network performance improvements. Despite its enormous promise, RIS confronts new hurdles in integrating into wireless networks efficiently due to its passive nature. Consequently, the channel estimation for, both full and nearly passive RIS and the RIS deployments are compared under various wireless communication models and for single and multi-users. Lastly, the challenges and potential future study areas for the RIS aided wireless communication systems are proposed

    I Can’t Get No (Need) Satisfaction: Applying Basic Psychological Needs Theory to Foster Human Connection and Improve Applicant Reactions in Asynchronous Video Interviews.

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    This research addresses the importance of making job applicants feel valued and respected, and tries to find ways to humanize high-stakes interactions in the digital age. In particular, this research experiments with designing one-way video interviews to increase applicants’ sense of connection to the hiring organization. The results underscore the need for organizations to develop these assessments with humane technology principles in mind, in order to foster positive reactions from applicants and secure top talent

    Cognitive Decay And Memory Recall During Long Duration Spaceflight

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    This dissertation aims to advance the efficacy of Long-Duration Space Flight (LDSF) pre-flight and in-flight training programs, acknowledging existing knowledge gaps in NASA\u27s methodologies. The research\u27s objective is to optimize the cognitive workload of LDSF crew members, enhance their neurocognitive functionality, and provide more meaningful work experiences, particularly for Mars missions.The study addresses identified shortcomings in current training and learning strategies and simulation-based training systems, focusing on areas requiring quantitative measures for astronaut proficiency and training effectiveness assessment. The project centers on understanding cognitive decay and memory loss under LDSF-related stressors, seeking to establish when such cognitive decline exceeds acceptable performance levels throughout mission phases. The research acknowledges the limitations of creating a near-orbit environment due to resource constraints and the need to develop engaging tasks for test subjects. Nevertheless, it underscores the potential impact on future space mission training and other high-risk professions. The study further explores astronaut training complexities, the challenges encountered in LDSF missions, and the cognitive processes involved in such demanding environments. The research employs various cognitive and memory testing events, integrating neuroimaging techniques to understand cognition\u27s neural mechanisms and memory. It also explores Rasmussen\u27s S-R-K behaviors and Brain Network Theory’s (BNT) potential for measuring forgetting, cognition, and predicting training needs. The multidisciplinary approach of the study reinforces the importance of integrating insights from cognitive psychology, behavior analysis, and brain connectivity research. Research experiments were conducted at the University of North Dakota\u27s Integrated Lunar Mars Analog Habitat (ILMAH), gathering data from selected subjects via cognitive neuroscience tools and Electroencephalography (EEG) recordings to evaluate neurocognitive performance. The data analysis aimed to assess brain network activations during mentally demanding activities and compare EEG power spectra across various frequencies, latencies, and scalp locations. Despite facing certain challenges, including inadequacies of the current adapter boards leading to analysis failure, the study provides crucial lessons for future research endeavors. It highlights the need for swift adaptation, continual process refinement, and innovative solutions, like the redesign of adapter boards for high radio frequency noise environments, for the collection of high-quality EEG data. In conclusion, while the research did not reveal statistically significant differences between the experimental and control groups, it furnished valuable insights and underscored the need to optimize astronaut performance, well-being, and mission success. The study contributes to the ongoing evolution of training methodologies, with implications for future space exploration endeavors

    Agency and professionalism in translation and interpreting: navigating conflicting role identities among translation and interpreting practitioners working for local government in Japan

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    This thesis investigates the ethical choices of Coordinators for International Relations (CIRs), a group of largely non-professional translators and interpreters working for local government bodies in Japan. In addition to T&I, CIRs are tasked with engaging in intercultural relations, “internationalising” their local areas, and working with the public as members of the civil service. The thesis examines the different roles and particular circumstances of CIRs to describe and explain how they make ethical decisions in T&I. This was explored using an ethnographic methodology featuring both traditional and online sites. Specifically, data was collected from participant observation of an internet forum created by CIRs, through online surveys, and also by employing focus groups and interviews held with CIRs in Japan. Analysis of forum and survey data illuminated the ethical struggles experienced by CIRs in T&I. It indicated that professionalism and agency were of particular concern for these CIRs when dealing with questions of ethics. Through focus groups, more detailed data was elicited surrounding the ethical struggles faced by CIRs, with a particular focus on professionalism and agency. Forum and focus group data combined to create a set of hypothetical ethical scenarios discussed during semistructured interviews held to understand factors that influence CIR decision making. A theoretical framework combining Agency Theory (Mitnick, 1975) and Role Identity Theory (Stryker, 1968) was used to describe and explain CIR ethical decision making; foregrounding their potential to effect change in their workplaces (agency) and the prioritisation afforded to different roles with which they identify in their work (role identity). Ultimately, CIRs were most disposed to translate or interpret in a manner that they believed was in keeping with the wishes of their employers, based on their superior ability to monitor and control the CIRs. However, in instances where the CIR operated with free will, their choices were a result of complex structuring of the various identities that they had normalised within themselves. Keywords: translation, interpreting, Coordinator for International Relations (CIR), Japan Exchange and Teaching (JET) Programme, agency, professionalism, role identity

    Health Leadership and Management Practices That Support Accountability for Results

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    Although leaders are expected to nurture and sustain a culture of accountability for results, little is known about how health leaders in developing countries perceive, interpret, demonstrate, and promote accountability in their day-to-day practices. The purpose of this generic qualitative study was to explore the management and leadership practices that leaders of public and non-profit health support organizations in Uganda utilize to embody and support accountability for key stakeholders’ results. Data from in-depths interviews with 13 participants at the governance, senior management, and middle management levels were analysed using thematic data analysis. Riggio\u27s conceptualization of using multiple perspectives and disciplines to understand leadership guided the study. The findings indicate that the combination of management and leadership practices that promote accountability results are motivated and sustained by the leaders’ ethical and moral values, character and soft skills; majorly driven by task, relations, change, and externally-oriented leadership behavior; aligned with the leaders’ perceived primary management and leadership roles and responsibilities; and focus on enabling others to identify the right problem to address, recognize and navigate the eclectic ecosystem-wide interests, and mandates. These findings add to knowledge on managing and leading accountability in low-income settings. Implications for positive social change included understanding how to identify, select, develop, promote, and retain managers and staff with the relevant skills, enduring positive intrapersonal accountability motives and practices; this results in building effective organization systems that shape, strengthen, and sustain a culture of accountability for results

    University of Windsor Graduate Calendar 2023 Winter

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    https://scholar.uwindsor.ca/universitywindsorgraduatecalendars/1026/thumbnail.jp

    Strawberry Production Guide For the Northeast, Midwest, and Eastern Canada 2nd Edition

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    This guide is intended as a comprehensive resource for both novice and experienced strawberry growers in northeastern North America. It provides information on all aspects of strawberry culture. The second edition has been updated and revised throughout, and includes expanded and new information on variety selection (Ch. 3), production systems (Ch. 4), harvesting, handling and transportation (Ch. 12), marketing (Ch. 13) and budgeting/economics (Ch. 14). In addition, a new section on diagnosing problems in strawberry plantings has been added (Ch. 15)
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