158 research outputs found
Context Design and Tracking for IoT-Based Energy Management in Smart Cities
No full textThe advent of the Internet of Things (IoT) and its innumerous applications for Smart Cities emphasizes the need for context-aware systems able to adapt behavior automatically to instant environment conditions. Currently, there is a gap in terms of understanding how context information is interrelated, as well as tracking which events occurred under which conditions within certain context scopes. Visualizing, specifying, tracking and monitoring typical contexts involved in IoT-based applications are still challenging activities since context modeling remains a low level process that requires much human expertise. In this paper we propose a new context life cycle that involves context design and context tracking. We developed a context-aware management framework, where contexts are modeled as graphs and can be explicitly designed and their occurrences can be tracked down. We believe that this feature of designing and tracking context graphs may help developers, administrators, and end-users in harnessing the wealth of information generated by highly scalable IoT systems
Dependence and risk spillovers among clean cryptocurrencies prices and media environmental attention
No full textThis paper examines the relationships among cryptocurrency environmental attention and clean cryptocurrencies prices using Time-Varying Parameter Vector Auto-Regression (TVP-VAR) and wavelets techniques. Results show strong connectedness among these variables, implying that the prices of clean cryptocurrencies are influenced by attention on cryptocurrency sustainability. Connectedness is stronger with positive shocks on environmental attention than negative shocks. Also, in the short-term, clean cryptocurrencies prices lead environmental attention, especially after 2021. However, there are notable periods when environmental attention led clean cryptocurrency prices before 2021. In the long-term, clean cryptocurrencies such as Hedera, Polygon, Cosmos, IOTA, TRON, Stellar, Tezos and Ripple lead environmental attention. In the presence of bitcoin, the degrees of connectedness increased across both shocks on cryptocurrency environmental attention. In all cases, the bitcoin market is the main destination of shocks from the system. We highlight some crucial implications of these results.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Economics of Technology and Innovatio
Body length, dry and ash-free dry weights, and developmental changes at each copepodid stage in five sympatric mesopelagic aetideid copepods in the western Arctic Ocean
No full textAetideid copepods dominate the mesopelagic layer of the Arctic Ocean and play an important role in the vertical material flux and biodiversity. However, little information about the lengths and weights of their copepodids is available. In this study, we collected five sympatric aetideid copepods, Chiridius obtusifrons Sars G.O., 1902, Gaetanus tenuispinus (Sars G.O., 1900), Gaetanus brevispinus (Sars G.O., 1900), Aetideopsis multiserrata (Wolfenden, 1904), and Aetideopsis rostrata Sars G.O., 1903, from the Arctic Ocean and examined their body lengths, dry and ash-free dry weights, and developmental growths at each copepodid stage. Highly significant length-weight relationships were obtained among copepodids for all species. Within genera, individuals of the same length were heavier at shallower depths. This may result from the greater nutritional availability to species within genera inhabiting shallower depths. Common to all species, the organic content (ash -free dry weight per dry weight) was high for the early copepodid stages. This may be due to the residual organic content of lipid-rich eggs retained in the non-feeding nauplii. The largest growth in females occurred at C5/C6, whereas the largest growth in males occurred at C4/C5, as determined by moult increment and proportion of growth in weight. These sex differences in weight growth could be due to the degeneration of the feeding appendage and cessation of feeding in C6 males of aetideid copepods
Theoretical studies of the historical development of the accounting discipline: a review and evidence
No full textMany existing studies of the development of accounting thought have either been atheoretical or have adopted Kuhn's model of scientific growth. The limitations of this 35-year-old model are discussed. Four different general neo-Kuhnian models of scholarly knowledge development are reviewed and compared with reference to an analytical matrix. The models are found to be mutually consistent, with each focusing on a different aspect of development. A composite model is proposed. Based on a hand-crafted database, author co-citation analysis is used to map empirically the entire literature structure of the accounting discipline during two consecutive time periods, 1972–81 and 1982–90. The changing structure of the accounting literature is interpreted using the proposed composite model of scholarly knowledge development
Dynamic dependence and predictability between volume and return of Non-Fungible Tokens (NFTs): The roles of market factors and geopolitical risks
No full textWe examine the dependence between volume and returns for the NFT market and three sub-markets (Cryptokitties, Cryptopunks, and Decentraland) using both quantile cross-spectral coherency and quantile regression techniques. Results from both techniques show significant evidence of dependence between NFT return and volume. Dependence between volume and return is weakest in the Cryptopunks market. Similarly, quantile regression results show that during extreme market conditions, equity and gold markets uncertainty, business condition and term-spread are important predictors of Cryptokitties returns, while oil, equity and gold markets uncertainty and geopolitical risks significantly predict Cryptopunks and Decentraland markets returns. In all cases, increase in Bitcoin prices reduces NFT market returns.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Economics of Technology and Innovatio
Life extension in protective coatings via self-healing technology
No full textAs the field of self-healing materials continues to grow, novel self-healing concepts and chemistries are being developed for a variety of applications including coatings. Self-healing functionality is typically considered for incorporation in coatings to solve two basic challenges including restoration of aesthetic properties and restoration of protective function. In this talk I will compare these challenges and discuss the capability of existing technologies to meet them. I will then discuss examples of the development and application of self-healing chemistries to protective coatings and the level of success achieved in autonomic repair of coatings that have been damaged via a variety of mechanisms. These examples will include a range of laboratory and commercial formulations evaluated with a target of real world deployment in the near future
Green Transition Efficiency in African Countries: The role of climate aid and climate readiness
No full textThis research is designed to provide a structured and comprehensive examination of the complex relationship between climate readiness, climate aid, and carbon efficiency in African countries. At its heart, the primary goal is to construct a climate readiness framework initially designed to assess developing nations and subsequently refine it to align with the distinct contexts of African nations. This framework undergoes a two-fold process, starting with its conceptualization and followed by its adaptation through a combination of theoretical examination and real-world application. It forms the foundation of this research, supplying essential insights relevant to policymakers and institutions engaged in tackling climate-related issues specific to Africa.In the second phase of the study, a linear regression model is employed to analyze the connections between carbon efficiency, climate readiness, and climate aid. Carbon efficiency is determined using Data Envelopment Analysis (DEA), while the climate readiness variable is derived from the developed framework. The empirical findings underscore the critical role of targeted climate aid, particularly in countries with higher climate preparedness. This synergy contributes significantly to decoupling carbon emissions from economic growth, emphasizing the importance of strategic climate aid in fostering sustainable and environmentally responsible economic development.Overall, this research aims to shed light on the complex interplay of factors shaping climate outcomes in African countries, providing a foundation for informed decision-making and policy development in the realm of climate change mitigation and adaptation.Management of Technology (MoT
Luoghi della migrazione e corpi della tradizione. Aggravanti e attenuanti culturali in materia di modificazioni dei genitali femminili
No full textThe law prohibiting the female genital mutilation was passed by the Ital- ian Parliament in 2006 (Law 7/2006). This article presents an anthropological review about Law 7/2006 and its application. First of all, the author reviews the ambiguous use of the term “mutilation”. Then, she reconstructs the case of a Nigerian woman, G.O., arrested in Verona for allegedly having performed the “mutilation” of a three-month-old girl. Police tracked down G.O. near Verona, apparently en route to carry out the same surgery on a two-week old baby. In the first instance, the process led to the condemnation of G.O and of the parents, guilty of mutilating their daughters. On appeal, this ruling was overturned be- cause of the non-existence of specific intent to injure the body of the child
PGP for portfolio optimization: application to ESG index family
No full textThe conventional portfolio design approach assumes Gaussian return distributions, but this is not accurate in practice. Asymmetric and heavy-tailed return distributions necessitate consideration of higher-order moments such as skewness and kurtosis, in addition to mean and variance. This study proposes a multi-objective approach using a mean-variance-skewness-kurtosis model to construct a diversified portfolio. A parametrized polynomial goal programming (PGP) method is used to optimize the portfolio by maximizing returns and skewness while minimizing variance and kurtosis. Empirical data from the S &P ESG index family is used, and PGP generates multiple portfolios reflecting investors’ preferences for the four moments. To compare between the obtained portfolios, we represent the empirical cumulative distribution of the portfolio returns for all studied values of weights and show how this can be used to assist the inverstor in selecting the best set of weights.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Economics of Technology and Innovatio
Tenure Security for Indonesia’s Urban Poor : a socio-legal study on land, decentralisation, and the rule of law in Bandung
No full textToday, about 1 billion people are
estimated to live in ‘slums’ worldwide. This number will only grow and
urban poverty worsen unless radical measures are taken. While it is
generally acknowledged in the international development debate that
breaking the circle of poverty requires multiple strategies, there is
renewed attention for approaches that centre on the issue of tenure
security.
This means landholders are protected against involuntary removal from
the land on which they reside, unless through due process of law and
payment of proper compensation. The prevailing approach to the provision
of tenure security is land registration. And while the land
registration approach currently dominates policy,
there has been little research into the effects of registration,
particularly in urban areas. What research has been conducted, contests
the benefits of this approach.
As a result, we witness increasing interest in alternative approaches
which generally combine protective administrative or legal measures
against eviction with the provision of basic services and credit
facilities.
The author describes and analyses the extent to which formal,
semiformal, and
informal tenure arrangements that can be found in kampongs (typical
low-income
settlements) in Indonesia provide tenure security to the country’s urban
poor, particularly since 1998, when Indonesia embarked on an ambitious
political and legal reform programme. The author reviews the current
legal framework that applies to urban land tenure in Indonesia. In
addition, based on rich material that was acquired through empirical
research in the city of Bandung, there are a number of case studies
presented in which the urban poor’s tenure security was put to the test.
Finally, drawing on statistical data, the author analyses the
urban poor’s perceptions regarding their tenure security and whether
and, if so, how this influences their housing investment behaviour.
Following this analysis, the author evaluates the socio-economic
benefits of current approaches to attaining tenure security. And with
these findings, there are policy suggestions
and contributions to theory formation presented to further the current
international development debate on tenure security.LEI Universiteit LeidenRule of Law and Development: Formation, Implementation and Improvement of Law and Governance in Developing Countrie
- …
