教学课程资源库 更多>>

关键词： Vehicle-to-grid   Resource management   Decision making   Costs   Computer science   Petroleum   Optimization   intelligent transportation systems   energy allocation   virtual network embedding   deep reinforcement learning  

摘要： As electric vehicle (EV) ownership becomes more commonplace, partly due to government incentives, there is a need also to design solutions such as energy allocation strategies to more effectively support sustainable vehicle-to-grid (V2G) applications. Therefore, this work proposes an energy allocation strategy, designed to minimize the electricity cost while improving the operating revenue. Specifically, V2G is abstracted as a three-domain network architecture to facilitate flexible, intelligent, and scalable energy allocation decision-making. Furthermore, this work combines virtual network embedding (VNE) and deep reinforcement learning (DRL) algorithms, where a DRL-based agent model is proposed, to adaptively perceives environmental features and extracts the feature matrix as input. In particular, the agent consists of a four-layer architecture for node and link embedding, and jointly optimizes the decision-making through a reward mechanism and gradient back-propagation. Finally, the effectiveness of the proposed strategy is demonstrated through simulation case studies. Specifically, compared to the used benchmarks, it improves the VNR acceptance ratio, Long-term average revenue, and Long-term average revenue-cost ratio indicators by an average of 3.17%, 191.36, and 2.04%, respectively. To the best of our knowledge, this is one of the first attempts combining VNE and DRL to provide an energy allocation strategy for V2G.

关键词： computer programming pedagogy   data analysis curriculum   R language   teaching programming   teaching statistics  

摘要： Educational curricula in data analysis are increasingly fundamental to statistics, data science, and a wide range of disciplines. The educational literature comparing coding syntaxes for instruction in data analysis recommends utilizing a simple syntax for introductory coursework. However, there is limited prior work to assess the pedagogical elements of coding syntaxes. The study investigates the paradigms of the dplyr, ***, and DTwrappers packages for R programming from a pedagogical perspective. We enumerate the pedagogical elements of computer programming that are inherent to utilizing each package, including the functions, operators, general knowledge, and specialized knowledge. The merits of each package are also considered in concert with other pedagogical goals, such as computational efficiency and extensions to future coursework. The pedagogical considerations of this study can help instructors make informed choices about their curriculum and how best to teach their selected methods.

关键词： Representation learning   Data models   Termination of employment   Learning systems   Task analysis   Robustness   Computer science   Data fusion   dimensionality reduction   graph convolutional networks (GCNs)   graph learning  

摘要： Graph convolutional network (GCN) outputs powerful representation by considering the structure information of the data to conduct representation learning, but its robustness is sensitive to the quality of both the feature matrix and the initial graph. In this article, we propose a novel multigraph fusion method to produce a high-quality graph and a low-dimensional space of original high-dimensional data for the GCN model. Specifically, the proposed method first extracts the common information and the complementary information among multiple local graphs to obtain a unified local graph, which is then fused with the global graph of the data to obtain the initial graph for the GCN model. As a result, the proposed method conducts the graph fusion process twice to simultaneously learn the low-dimensional space and the intrinsic graph structure of the data in a unified framework. Experimental results on real datasets demonstrated that our method outperformed the comparison methods in terms of classification tasks.

关键词： Circuit faults   Surveys   Databases   Computer science   Systematics   Standards   Transistors   Analog circuits   defect injection   defect models   fault simulation   functional safety   SPICE-based simulation   transistor-level models  

摘要： Since the last century, the exponential growth of the semiconductor industry has led to the creation of tiny and complex integrated circuits, e.g., sensors, actuators, and smart power. Innovative techniques are needed to ensure the correct functionality of analog devices that are ubiquitous in every smart system. The ISO 26262 standard for functional safety in the automotive context specifies that fault injection is necessary to validate all electronic devices. For decades, standardization of defect modeling and injection mainly focused on digital circuits and, in a minor part, on analog ones. An initial attempt is being made with the IEEE P2427 draft standard that started to give a structured and formal organization to the analog testing field. Various methods have been proposed in the literature to speed up the fault simulation of the defect universe for an analog circuit. A more limited number of papers seek to reduce the overall simulation time by reducing the number of defects to be simulated. This literature survey describes the state-of-the-art of analog defect injection and the fault simulation methods. The survey is based on the preferred reporting items for systematic reviews and meta-analyses (PRISMA) methodological flow, allowing for a systematic and complete literature survey. Each selected paper has been categorized and presented to provide an overview of all the available approaches. In addition, the limitations of the various approaches are discussed by showing possible future directions.

关键词： Codes   Decoding   Computer science   Reed-Solomon codes   Reed-Muller codes   Nuclear power generation   Internet   Coding theory   list-decoding   multiplicity codes  

摘要： The multiplicity Schwartz-Zippel lemma bounds the total multiplicity of zeroes of a multivariate polynomial on a product set. This lemma motivates the multiplicity codes of Kopparty, Saraf and Yekhanin [J. ACM, 2014], who showed how to use this lemma to construct high-rate locally-decodable codes. However, the algorithmic results about these codes crucially rely on the fact that the polynomials are evaluated on a vector space and not an arbitrary product set. In this work, we show how to decode multivariate multiplicity codes of large multiplicities in polynomial time over finite product sets (over fields of large characteristic and zero characteristic). Previously such decoding algorithms were not known even for a positive fraction of errors. In contrast, our work goes all the way to the distance of the code and in particular exceeds both the unique-decoding bound and the Johnson radius. For errors exceeding the Johnson radius, even combinatorial list-decodablity of these codes was not known. Our algorithm is an application of the classical polynomial method directly to the multivariate setting. In particular, we do not rely on a reduction from the multivariate to the univariate case as is typical of many of the existing results on decoding codes based on multivariate polynomials. However, a vanilla application of the polynomial method in the multivariate setting does not yield a polynomial upper bound on the list size. We obtain a polynomial bound on the list size by taking an alternative view of multivariate multiplicity codes. In this view, we glue all the partial derivatives of the same order together using a fresh set z of variables. We then apply the polynomial method by viewing this as a problem over the field F(z) of rational functions in z .

关键词： Facial Expressions   Virtual World   Face To Face Interactions   Body Language   Distance Constraints   Virtual Avatar   Opportunities For Connection   Future Concepts   Machine Learning   Computer Science   Pandemic Response   Human Computer Interaction   M Health   Severe Mental Illness   Physical World   Article Type   Cambridge University   Oulu University   University Of Glasgow   Ubiquitous Computing   Bell Labs  

摘要： The metaverse is rapidly evolving from a concept of the future into a vibrant digital playground, where individuals can engage with each other, learn, and explore through immersive virtual experiences. This emerging space offers thrilling opportunities for global connection, allowing us to share ideas and innovations without the constraints of physical distance. However, as we immerse ourselves more in these virtual worlds, concerns are rising about their effects on our real-life social abilities.

关键词： death penaty   Foreign Nationals   Violent Crime   Migrant workers   precarity  

摘要： This article focuses on the cases of 664 foreign nationals, the majority of whom are migrant workers, under sentence of death across the Gulf states (including Jordan and Lebanon) between 2016 and 2021. The features of these cases suggest that they are inextricably linked to migrant workers' dependency under the kafala system, with examples of migrants duped into smuggling drugs across the border by their migrant broker, and once in country, accounts of violent altercations due to disputes about exit visas, and in the case of migrant domestic workers, self-defence against sexual violence. Engaging with the burgeoning literature on immigration, exploitation and criminalisation, as well as scholarship on capital punishment, this article will explore the multiple and unique layers of dependency fostered by the kafala system that place migrant workers at higher risk of the death penalty in these Gulf jurisdictions.

关键词： Primary shelf life   Quality deterioration kinetics   Critical limit   Moisture   Oxidation  

摘要： Simple dimensionless formula was mathematically derived to relate secondary shelf life (SSL) of packaged foods to package opening time (POT) and food quality deterioration rate shift (k2/k1) thereafter. Their primary shelf life (PSL) was assumed to be time period to reach a critical limit of acceptability in the intact packaged state. A formula universally applicable for first order, zero order, exponential autoxidation and moisture permeation kinetics could be formulated: SSL/PSL=(1-POT/PSL)/(k2/k1). The model formula was verified by mathematical simulation for typical conditions of kinetic parameters and quality limits. Its implication and limitation were discussed in perspective of practical applicability keeping in mind the supposed hypotheses. Overview on the nature of SSL as function of POT and k2/k1 shows that the latter influences SSL dominantly, and keeping it low after package opening, desirably below 5, is essential to ensure substantially long SSL. The formulated model can be useful to provide guideline of package opening and SSL in shelf life management including marketing and consumer use of the packaged foods.

关键词： Antrodia cinnamomea mycelium   antioxidant capacity   diarrhea incidence   immune response genes   weaned piglet  

摘要： This study evaluated the effects of supplementation with Antrodia cinnamomea mycelium by-product (ACBP) on growth performance and immune response in weaning piglets. Total available content and antioxidant capacity of ACBP were determined. Ninety-six black pigs were randomly distributed to 24 pens. Study compared four groups which were supplemented with ACBP at 0%, 2.5%, 5%, or 10% for 6 weeks after weaning at 4 weeks. Results showed that ACBP on total phenolic, total flavonoid, and total triterpenoids contents were 13.68 mg GAE/g DW, 1.67 μg QE/g DW, and 15.6 mg/g, respectively. Weaning piglets fed 2.5% ACBP showed a significant decreased body weight gain compared with those supplemented with 5% ACBP, 10% ACBP, and control groups. Results showed that all ACBP groups increased the villi height of jejunum significantly. Incidence of diarrhea in 11 weeks with supplementation with 5% and 10% ACBP diets were lower than in control group. The 10% ACBP group showed significantly lower expression of immune response genes (IL-1β, IL-6, IL-8, TNF-α, and IFN-γ) than the 2.5% and 5% ACBP groups. Based on results, dietary supplementation with 10% ACBP did not significantly affect body weight but could decrease piglet diarrhea condition and expression of IL-1β and IL-6 genes.