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关键词： Computer Science   Engineering & Technology   MathML   US - Fairmont Press  

ISBN: (数字)9788770228510 ISBN: (纸本)9788770228657

摘要： CNTs have a variety of applications because of their distinctive molecular structure and show unique electronic and mechanical properties because of their curvature. Nanotubes and micro-beams can be cited as one of the very applicable micro- and nano-structures in various systems, namely, sensing devices, communications and the quantum mechanics. The application of the tiny structures, specifically, carbon nanotubes in the sensors and actuators enforce the engineers to study vibrational properties of those structures experimentally and theoretically. In addition, they are utilized in different fields such as bioengineering, tissue engineering, computer engineering, optics, energy and environmental systems. This book presents vibration modeling and analysis of carbon nanotubes which be helpful in applications such as oscillators and in non-destructive testing, and also vibrations characteristics of single-walled CNT by means of continuum models. These models are established by inferring the dynamical equations in to different theories, which is our particular motivation. The suggested methods to investigate the solution of fundamental relations are Rayleigh Ritz, Galerkin and wave propagation, which are well-known and efficient techniques to develop the fundamental frequency equations. The frequencies of three different types of SWCNTs are calculated. Also, the vibrations of the chiral single-walled carbon nanotube (SWCNTs) with theories using various approaches are investigated. It has been investigated that by increasing the aspect ratios decreases the frequencies and on increasing the height-to-diameter ratios increases the frequencies throughout the computation frequencies of clamped-free lower than that of clamped-clamped.

关键词： Computer Science   Data Structures and Algorithms  

摘要： We consider the matching problem on the line with advice complexity. We give a 1-competitive online algorithm with advice complexity n - 1 , and show that there is no 1-competitive online algorithm reading less than n - 1 bits of advice. Moreover, for each 0 < k < n we present a c(n/k)-competitive online algorithm with advice complexity O(k(log N + log n)) where n is the number of servers, N is the distance of the minimal and maximal servers, and c(n) is the complexity of the best online algorithm without advice.

关键词： Electronic learning   Recommender systems   Autism   Visualization   Computer science   Training   Information and communication technology   Assistive technologies   Applied behavior analysis (ABA)   assistive technology (AT)   autism spectrum disorder (ASD)   content recommender system   collaborative filtering recommender system   electronic learning (E-learning)   hybrid recommender system   information and communication system (ICT)  

摘要： Autism, also known as Autism Spectrum Disorder (ASD) or Asperger's syndrome, has an impact on cognition, social relationships, and behavior. Based on these characteristics and their learning interests, e-learning (Electronic Learning) recommendation systems attempt to provide personalized recommendations. This may enhance the learning ability of individuals with ASD. However, some technological challenges limit the ability of the population to use support scenarios and prevent efficient learning. This study tries to review e-learning recommender systems for individuals with ASD. The main identified aspects are 1) lack of design principles while building customized e-learning platforms for those with ASD;2) technological limitations to developing recommender systems for e-learning, and 3) suggestions that reduce field limitations. The studies additionally discovered that social communication and psychological abilities had the greatest focus of study. A small number of studies mentioned the participant's ASD level, the majority of the articles highlighted the beneficial effects of designing a content-based recommender system specifically for those with ASD.

关键词： Computer Science   Logic in Computer Science  

摘要： In the literature on Kleene algebra, a number of variants have been proposed which impose additional structure specified by a theory, such as Kleene algebra with tests (KAT) and the recent Kleene algebra with observations (KAO), or make specific assumptions about certain constants, as for instance in NetKAT. Many of these variants fit within the unifying perspective offered by Kleene algebra with hypotheses , which comes with a canonical language model constructed from a given set of hypotheses. For the case of KAT, this model corresponds to the familiar interpretation of expressions as languages of guarded strings. A relevant question therefore is whether Kleene algebra together with a given set of hypotheses is complete with respect to its canonical language model. In this paper, we revisit, combine and extend existing results on this question to obtain tools for proving completeness in a modular way. We showcase these tools by giving new and modular proofs of completeness for KAT, KAO and NetKAT, and we prove completeness for new variants of KAT: KAT extended with a constant for the full relation, KAT extended with a converse operation, and a version of KAT where the collection of tests only forms a distributive lattice.

关键词： cardiopulmonary resuscitation   basic life support   serious game   CPR training   usability   cardiopulmonary   emergency   life support   CPR   training   education   game   gaming   educational   resuscitation   survey   satisfaction   SUS   user experience   System Usability Scale  

关键词： Free-space optics   Laser lights   Mobile computing   Sensing systems   Environmental destruction  

摘要： We live in an era where the impact of climate change is felt in everyday life, with warming temperatures leading to environmental destruction and unprecedented shifts in natural and anthropic activities. Before these adverse effects can be addressed, it is crucial to explore, monitor, and collect data on the Earth's environment on both the micro- and macro-scale. Additionally, once environmental solutions have been implemented, it is imperative to continue data collection to gauge success. Standing in the way of such exploration and monitoring efforts are the shortcomings and limitations of pervasive communication technologies, namely radio frequency technologies (e.g., WiFi and Bluetooth). In this thesis, we peer beyond the confines of the radio frequency spectrum and explore the use of light — namely visible light, along with its infrared neighbor — to create next-generation communication and sensing systems. To generate highly tunable light, we explicitly turn to lasers. Unlike traditional luminaries, e.g., light-emitting diodes, laser diodes provide superior communication and sensing performance thanks to their GHz modulation speeds, narrow spectral wavelengths, intrinsic polarization, high-power densities, and high electro-optical conversion ratios. In this thesis, we exploit the versatility of laser light to enable micro- and macro-scale exploration and monitoring systems in aquatic, terrestrial, and aerial environments. We begin by exploring the powerful potential of laser light in communication and sensing contexts, then dive into the overarching challenges and techniques needed to realize practical and robust solutions. Armed with our research methodology, we then break through the air-water boundary with laser light and demonstrate two systems supporting bidirectional communication and 3D localization between aerial and underwater robots. Continuing on land and in the air, we next present two systems enabling laser tethering, communication, and wireless po

关键词： 科幻电影   脑机接口   技术伦理   超人类主义   后人类主义  

摘要： 无论是理论视域的介入还是实践层面的考察，有关主体身份的伦理观照是始终伴随的必然命题。面对“人之为人目的”的伦理主体隐忧，脑机接口技术的出场则导向为一种“人之主体是否渐次剥离”的伦理警惕。尽管脑机接口技术现实性的应用伴随着“超人类主义”向“后人类主义”过渡的人类增强或医疗目的的功能性特质，然而其对主体身份伦理问题的探赜却停留在当下性的问询之中。与此同时，科幻电影则以富有未来性关怀的想象力建构了超越性、整体性、前瞻性的伦理困境场。尤其是通过科幻未来影像故事的假定性生成将脑机接口技术对人之主体身份的影响渐次呈现，进一步彰显了脑机互联如何生发人类异化的悲戚可能。同时，在脑机接口和人性弥散与消退的哲学思考中，阐释了人之知情同意权被捆绑后的技术宰治身体与数字永生生命等主体身份的伦理困厄。

关键词： Education   Recommender systems   Electronic learning   Reviews   Artificial intelligence   Computer science   Surveys   Digital systems   Online services   digital technologies   e-learning   online education   personalized recommendation system  

摘要： This review delves into using e-learning technology and personalized recommendation systems in education. It examines 60 articles from prominent databases and identifies the different methods used in recommendation systems, such as collaborative and content-based approaches with a recent shift towards machine learning. However, the current personalized recommendation system faces challenges such as a lack of understanding of the content, student discontinuity, language barriers, confusion in selecting study materials, and inadequate infrastructure and funding. The review proposes using new digital technologies to address these issues, including Fluxy AI, Twin technology, AI-powered virtual proctoring, and Alter Ego. These technologies can create a dynamic and interactive learning environment, providing tailored learning experiences for students and insights for educators to provide targeted support and guidance. The integration of these technologies can improve individualized learning, increase understanding capacity and enhance the learning experience for students with speech disorders.

关键词： Computer science   computing   decision-making   diversity   engineering education   equity   gender   higher education   postsecondary education   qualitative research   race/ethnicity   science education   women's issues  

摘要： Despite the growing popularity of computing bachelor's programs, women remain vastly underrepresented in these fields. Using Social Cognitive Career Theory and intersectionality as guiding theories, this qualitative study explores how postsecondary institutions shape women's experiences choosing and entering computing bachelor's programs. Twenty-eight of 40 participants entered their institutions with plans to study computing, while 12 developed a new (or renewed) interest in computing as postsecondary students. Findings outline four postsecondary structures that shaped women's entry into computing majors, including university-level admissions and participant perceptions of financial and cultural accessibility;academic college-level organization and admissions processes;institutional computing cultures, namely introductory course experiences and social environments;and major declaration policies. Findings also show how these structures differentially shaped participant experiences based on intersecting social identities. Overall, findings illustrate the precarious relationship between computing interest development, major intent, and major enrollment for undergraduate women in computing.

关键词： Computer Science curriculum   accessibility teaching   accessibility evaluation   MOOC   WCAG  

摘要： Web Content Accessibility Guidelines (WCAG) have been the de facto standard for Web accessibility evaluation for more than two decades and therefore have been introduced into legislation and university curriculum in Computer Science. At The National Distance Education University (UNED) in Spain, we have been teaching the guidelines for the last 15 years but learning how to apply WCAG criteria is complex. In this paper, we present the results of the analysis of students' performance in applying accessibility heuristic evaluation of an online resource (a Massive Open Online Course - MOOC) using WCAG. The experiment was carried out over two academic years to evaluate how accurate and easy it is to understand and use WCAG criteria by trained students as well as their perceptions of usefulness to evaluate accessibility barriers using automatic tools in combination with manual evaluation. Results from the study show that errors identified are aligned with accessibility evaluation literature: 65% of success criteria in WCAG do not reach 80% of agreement among raters which confirms the complexity of WCAG conformance. In total 62 (86%) criteria are marked as not being correctly addressed by automatic tools with an overlap of those showing false positives, and 25 criteria (34%) are indicated as difficult to evaluate manually. While all areas where raters disagree are potential opportunities for WCAG improvement, this research reinforces that WCAG evaluations are complex and difficult even with current automatic tools, and that the possible solutions for the way forward are: (1) a well-defined evaluation protocol including a combination of automatic tools and manual evaluations;(2) better training and professional development opportunities.