5,692 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
Robust and Listening-Efficient Contention Resolution
This paper shows how to achieve contention resolution on a shared
communication channel using only a small number of channel accesses -- both for
listening and sending -- and the resulting algorithm is resistant to
adversarial noise.
The shared channel operates over a sequence of synchronized time slots, and
in any slot agents may attempt to broadcast a packet. An agent's broadcast
succeeds if no other agent broadcasts during that slot. If two or more agents
broadcast in the same slot, then the broadcasts collide and both broadcasts
fail. An agent listening on the channel during a slot receives ternary
feedback, learning whether that slot had silence, a successful broadcast, or a
collision. Agents are (adversarially) injected into the system over time. The
goal is to coordinate the agents so that each is able to successfully broadcast
its packet.
A contention-resolution protocol is measured both in terms of its throughput
and the number of slots during which an agent broadcasts or listens. Most prior
work assumes that listening is free and only tries to minimize the number of
broadcasts.
This paper answers two foundational questions. First, is constant throughput
achievable when using polylogarithmic channel accesses per agent, both for
listening and broadcasting? Second, is constant throughput still achievable
when an adversary jams some slots by broadcasting noise in them? Specifically,
for packets arriving over time and jammed slots, we give an algorithm
that with high probability in guarantees throughput and
achieves on average channel accesses against an
adaptive adversary. We also have per-agent high-probability guarantees on the
number of channel accesses -- either or , depending on how quickly the adversary can react to what
is being broadcast
Life in Health 2021: Research and Practice
This proceedings contain a selection of papers from the international interdisciplinary conference Life in Health 2021, which took place from 9 to 10 September 2021 in the Czech Republic at the Faculty of Education, Masaryk University. The papers focus on general as well as specific approaches to public health protection and promotion. The findings presented are based on research data and are applicable in health education and general education of children and the whole population
The Perception of K-12 Instrumental Directors in Low-Income Areas on Virtual Learning with Skill Development and Retention
Due to the extreme measures taken to protect students from COVID-19 during the pandemic, schools closed their doors, and educators struggled to continue teaching through virtual learning platforms. Performance-based classrooms were encouraged to discover new methods and strategies to motivate students to thrive even though face-to-face rehearsals were restricted. This study examined the experiences secondary music education instrumentalists faced while attempting to utilize synchronous and asynchronous instruction in a 100 percent virtual performance-based environment. This study aimed to understand the negative and positive effects placed on secondary instrumentalists’ performance abilities, fundamental development, and participation/retention since the introduction of virtual learning in low-income areas. The focus of this study also examined the possible benefits of enhancing pedagogical skills through the addition of technological advances to push instrumental instruction and performances on the secondary level. This study followed a qualitative hermeneutic phenomenology design. Music educators in low-income DeKalb County communities were interviewed for this study. Participants were requested to share their perspectives and experiences of performance-based virtual learning and results. The study raised the need for future discussions to create and implement a state and national virtual music education guideline that would assist music educators in turning a devastating situation into a blessing for all art programs and their stakeholders
Reshaping Higher Education for a Post-COVID-19 World: Lessons Learned and Moving Forward
No abstract available
Design and Implementation of Indoor Disinfection Robot System
After the outbreak of COVID-19 virus, disinfection has become one of the important means of epidemic prevention. Traditional manual disinfection can easily cause cross infection problems. Using robots to complete disinfection work can reduce people's social contact and block the spread of viruses. This thesis implements an engineering prototype of a indoor disinfection robot from the perspective of product development, with the amin of using robots to replace manual disinfection operations.
The thesis uses disinfection module, control module and navigation module to compose the hardware of the robot. The disinfection module uses ultrasonic atomizers, UV-C ultraviolet disinfection lamps, and air purifiers to disinfect and disinfect the ground and air respectively. The control module is responsible for the movement and obstacle avoidance of the robot. The navigation module uses Raspberry Pi and LiDAR to achieve real-time robot positioning and two-dimensional plane mapping.
In terms of robot software,we have done the following work: (1) Based on the ROS framework, we have implemented functions such as SLAM mapping, location positioning, and odometer data calibration.(2) Customize communication protocols to manage peripheral devices such as UV-C lights, ultrasonic atomizers, air purifiers, and motors on the control board. (3) Develop an Android mobile app that utilizes ROSBridge's lightweight communication architecture to achieve cross platform data exchange between mobile devices and navigation boards, as well as network connectivity and interaction between mobile phones and robots
Finally, this thesis implements an engineering prototype of a household disinfection robot from the perspective of product development
Post-Growth Geographies: Spatial Relations of Diverse and Alternative Economies
Post-Growth Geographies examines the spatial relations of diverse and alternative economies between growth-oriented institutions and multiple socio-ecological crises. The book brings together conceptual and empirical contributions from geography and its neighbouring disciplines and offers different perspectives on the possibilities, demands and critiques of post-growth transformation. Through case studies and interviews, the contributions combine voices from activism, civil society, planning and politics with current theoretical debates on socio-ecological transformation
Trustworthy Federated Learning: A Survey
Federated Learning (FL) has emerged as a significant advancement in the field
of Artificial Intelligence (AI), enabling collaborative model training across
distributed devices while maintaining data privacy. As the importance of FL
increases, addressing trustworthiness issues in its various aspects becomes
crucial. In this survey, we provide an extensive overview of the current state
of Trustworthy FL, exploring existing solutions and well-defined pillars
relevant to Trustworthy . Despite the growth in literature on trustworthy
centralized Machine Learning (ML)/Deep Learning (DL), further efforts are
necessary to identify trustworthiness pillars and evaluation metrics specific
to FL models, as well as to develop solutions for computing trustworthiness
levels. We propose a taxonomy that encompasses three main pillars:
Interpretability, Fairness, and Security & Privacy. Each pillar represents a
dimension of trust, further broken down into different notions. Our survey
covers trustworthiness challenges at every level in FL settings. We present a
comprehensive architecture of Trustworthy FL, addressing the fundamental
principles underlying the concept, and offer an in-depth analysis of trust
assessment mechanisms. In conclusion, we identify key research challenges
related to every aspect of Trustworthy FL and suggest future research
directions. This comprehensive survey serves as a valuable resource for
researchers and practitioners working on the development and implementation of
Trustworthy FL systems, contributing to a more secure and reliable AI
landscape.Comment: 45 Pages, 8 Figures, 9 Table
Towards Cyber Security for Low-Carbon Transportation: Overview, Challenges and Future Directions
In recent years, low-carbon transportation has become an indispensable part
as sustainable development strategies of various countries, and plays a very
important responsibility in promoting low-carbon cities. However, the security
of low-carbon transportation has been threatened from various ways. For
example, denial of service attacks pose a great threat to the electric vehicles
and vehicle-to-grid networks. To minimize these threats, several methods have
been proposed to defense against them. Yet, these methods are only for certain
types of scenarios or attacks. Therefore, this review addresses security aspect
from holistic view, provides the overview, challenges and future directions of
cyber security technologies in low-carbon transportation. Firstly, based on the
concept and importance of low-carbon transportation, this review positions the
low-carbon transportation services. Then, with the perspective of network
architecture and communication mode, this review classifies its typical attack
risks. The corresponding defense technologies and relevant security suggestions
are further reviewed from perspective of data security, network management
security and network application security. Finally, in view of the long term
development of low-carbon transportation, future research directions have been
concerned.Comment: 34 pages, 6 figures, accepted by journal Renewable and Sustainable
Energy Review
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The Role of Interactive Web Broadcasts in Fostering Distance Learning Students’ Engagement with Practical Lab and Fieldwork
Practical work in science and technology disciplines is crucial for students’ understanding and mastery. For educators who teach those disciplines at a distance and for students who learn remotely, this endeavour may be challenging.
The study presented in this thesis investigates the use of Interactive Web Broadcasts (IWBs) in five undergraduate practical science and technology modules at The Open University. The study examines the reasons for using IWBs, as well as the strategies and types of interactions that staff and students use to engage and interact with one another. The study gathered perspectives from academics (n=18); associate lecturers (n=10); technical production team (n=3); students (n=88), and an external guest expert about the purposes, strategies and motivations of participating in IWBs. The study used a qualitatively mixed-methods design. An adapted protocol of Flanders’s Interaction Analysis Categories was used to analyse the interaction patterns in the web broadcast transcripts and text-chat logs, and a discourse analysis coding scheme was applied to analyse the text-chat. Student online questionnaires were administered towards the end of the modules to capture the student perceptions of IWBs. Student interviews and staff focus groups were also conducted to gain a fuller picture of experiences of using and engaging with IWBs.
Findings show that the purposes and aims of using IWBs are to facilitate student engagement, foster a sense of community, and demonstrate an authentic practice of the sciences in real-world contexts. The communicative strategies were primarily affective and met students’ interests and expectations. The IWBs mitigated feelings of isolation that are common in distance education environments. IWBs had positive impacts on professional teaching practices and fostered collegiality and collaboration among staff. The findings are relevant to other distance and traditional campus-based universities that teach practical science and technology, those who teach online using synchronous technology-mediated systems, and those who are interested in student engagement and practical work
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