8,082 research outputs found
UMSL Bulletin 2023-2024
The 2023-2024 Bulletin and Course Catalog for the University of Missouri St. Louis.https://irl.umsl.edu/bulletin/1088/thumbnail.jp
Analysis and Design of Non-Orthogonal Multiple Access (NOMA) Techniques for Next Generation Wireless Communication Systems
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
Ethnographies of Collaborative Economies across Europe: Understanding Sharing and Caring
"Sharing economy" and "collaborative economy" refer to a proliferation of initiatives, business models, digital platforms and forms of work that characterise contemporary life: from community-led initiatives and activist campaigns, to the impact of global sharing platforms in contexts such as network hospitality, transportation, etc. Sharing the common lens of ethnographic methods, this book presents in-depth examinations of collaborative economy phenomena. The book combines qualitative research and ethnographic methodology with a range of different collaborative economy case studies and topics across Europe. It uniquely offers a truly interdisciplinary approach. It emerges from a unique, long-term, multinational, cross-European collaboration between researchers from various disciplines (e.g., sociology, anthropology, geography, business studies, law, computing, information systems), career stages, and epistemological backgrounds, brought together by a shared research interest in the collaborative economy. This book is a further contribution to the in-depth qualitative understanding of the complexities of the collaborative economy phenomenon. These rich accounts contribute to the painting of a complex landscape that spans several countries and regions, and diverse political, cultural, and organisational backdrops. This book also offers important reflections on the role of ethnographic researchers, and on their stance and outlook, that are of paramount interest across the disciplines involved in collaborative economy research
Closeness and Residual Closeness of Harary Graphs
Analysis of a network in terms of vulnerability is one of the most
significant problems. Graph theory serves as a valuable tool for solving
complex network problems, and there exist numerous graph-theoretic parameters
to analyze the system's stability. Among these parameters, the closeness
parameter stands out as one of the most commonly used vulnerability metric. Its
definition has evolved over time to enhance ease of formulation and
applicability to disconnected structures. Furthermore, based on the closeness
parameter, residual closeness, which is a newer and more sensitive parameter
compared to other existing parameters, has been introduced as a new graph
vulnerability index by Dangalchev. In this study, the outcomes of the closeness
and residual closeness parameters in Harary Graphs have been examined. Harary
Graphs are well-known constructs that are distinguished by having vertices
that are -connected with the least possible number of edges.Comment: 21 pages preprin
Improved Approximation Bounds for Minimum Weight Cycle in the CONGEST Model
Minimum Weight Cycle (MWC) is the problem of finding a simple cycle of
minimum weight in a graph . This is a fundamental graph problem with
classical sequential algorithms that run in and
time where and . In recent years this problem
has received significant attention in the context of hardness through fine
grained sequential complexity as well as in design of faster sequential
approximation algorithms.
For computing minimum weight cycle in the distributed CONGEST model,
near-linear in lower and upper bounds on round complexity are known for
directed graphs (weighted and unweighted), and for undirected weighted graphs;
these lower bounds also apply to any -approximation algorithm.
This paper focuses on round complexity bounds for approximating MWC in the
CONGEST model: For coarse approximations we show that for any constant , computing an -approximation of MWC requires rounds on weighted undirected graphs and on directed graphs, even
if unweighted. We complement these lower bounds with sublinear
-round algorithms for approximating MWC close to a factor
of 2 in these classes of graphs.
A key ingredient of our approximation algorithms is an efficient algorithm
for computing -approximate shortest paths from sources in
directed and weighted graphs, which may be of independent interest for other
CONGEST problems. We present an algorithm that runs in rounds if and rounds if , and this round
complexity smoothly interpolates between the best known upper bounds for
approximate (or exact) SSSP when and APSP when
Southern Adventist University Undergraduate Catalog 2022-2023
Southern Adventist University\u27s undergraduate catalog for the academic year 2022-2023.https://knowledge.e.southern.edu/undergrad_catalog/1121/thumbnail.jp
The community language learning approach to improve speaking skills on senior year students at Cahuasqui High School
To incorporate strategies using the Community Language Learning approach in the improvement of speaking skills of senior-year students at “Cahuasqui” high school, during the school year 2021-2022.El estudio de investigación actual sobre estrategias para mejorar las habilidades del habla utilizando el enfoque de aprendizaje comunitario de idiomas se realizó porque este enfoque no se había utilizado en esta área rural en particular. El inglés es una de las materias que no ha tenido tanta fuerza en la zona rural en cuanto a tener un nivel similar o cercano al de un estudiante de una institución urbana. La investigación es significativa porque muestra que la adquisición del idioma inglés merece el uso de enfoques creativos. Para inscribirse en la universidad, los estudiantes deben alcanzar un nivel aceptable y tener habilidades lingüísticas rudimentarias. El objetivo principal de la investigación fue utilizar estrategias de aprendizaje comunitario de idiomas para mejorar las habilidades del habla teniendo en cuenta tres factores importantes: las dificultades físicas en la educación rural, las complicaciones del bajo dominio del inglés en la educación rural y la falta de motivación de los estudiantes para aprender inglés cuando comparando la educación urbana y rural. Este estudio es un estudio de caso cuantitativo y cualitativo que considera como herramientas de investigación un grupo focal, una encuesta a estudiantes y una entrevista a docentes. Todo esto para lograr el objetivo planteado que es establecer cuáles son las estrategias del enfoque (CLL) más adecuadas para desarrollar la expresión oral en los estudiantes de último año del liceo “Cahuasqui”. Los resultados se analizaron de acuerdo con la respuesta total de los participantes. Los resultados de las percepciones de los participantes fueron altamente significativos. Todos los entrevistados coincidieron en que la población de estudio carecía de recursos para mejorar sus habilidades orales. Por lo general, los docentes fueron los que buscaron nuevas formas de enseñar a sus alumnos con recursos limitados, y los docentes también sufren una falta de preparación para tratar con las zonas rurales. En conclusión, los hallazgos indican que es factible trabajar con un nuevo enfoque en el lugar. Se decidió crear una guía didáctica que contenga las tácticas más adecuadas para su aplicación y aporte en esta zona rural.Maestrí
Asymptotically Tight Bounds on the Time Complexity of Broadcast and Its Variants in Dynamic Networks
2023-2024 academic bulletin & course catalog
University of South Carolina Aiken publishes a catalog with information about the university, student life, undergraduate and graduate academic programs, and faculty and staff listings
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