Search Results (66)

Cooperative MIMO communication systems play an important role in the development of future sixth-generation (6G) wireless systems incorporating new technologies such as massive MIMO relay systems, dual-polarized antenna arrays, millimeter-wave communications, and, more recently, communications assisted using intelligent reflecting surfaces (IRSs), and unmanned aerial vehicles (UAVs). In a companion paper, we provided an overview of cooperative communication systems from a tensor modeling perspective. The objective of the present paper is to provide a comprehensive tutorial on semi-blind receivers for MIMO one-way two-hop relay systems, allowing the joint estimation of transmitted symbols and individual communication channels with only a few pilot symbols. After a reminder of some tensor prerequisites, we present an overview of tensor models, with a detailed, unified, and original description of two classes of tensor decomposition frequently used in the design of relay systems, namely nested CPD/PARAFAC and nested Tucker decomposition (TD). Some new variants of nested models are introduced. Uniqueness and identifiability conditions, depending on the algorithm used to estimate the parameters of these models, are established. Two families of algorithms are presented: iterative algorithms based on alternating least squares (ALS) and closed-form solutions using Khatri–Rao and Kronecker factorization methods, which consist of SVD-based rank-one matrix or tensor approximations. In a second part of the paper, the overview of cooperative communication systems is completed before presenting several two-hop relay systems using different codings and configurations in terms of relaying protocol (AF/DF) and channel modeling. The aim of this presentation is firstly to show how these choices lead to different nested tensor models for the signals received at destination. Then, by capitalizing on these models and their correspondence with the generic models studied in the first part, we derive semi-blind receivers to jointly estimate the transmitted symbols and the individual communication channels for each relay system considered. In a third part, extensive Monte Carlo simulation results are presented to compare the performance of relay systems and associated semi-blind receivers in terms of the symbol error rate (SER) and channel estimate normalized mean-square error (NMSE). Their computation time is also compared. Finally, some perspectives are drawn for future research work. Full article

This paper proposes the use of Pierre Bourdieu’s sociological concepts of social fields, capital, and habitus to analyze water management in Colombia. By mapping the social dynamics of water management, this study examines the interactions and power relationships among agents, including government agencies, private companies, academic institutions, non-profits, and local communities. The analysis reveals how various forms of capital, such as economic, cultural, social, and symbolic, influence water management practices, policies, and the distribution of power. Integrating agent-based modeling with hydrological simulations provides a more nuanced understanding of how social dynamics influence water management. This interdisciplinary approach helps develop more adaptive and equitable strategies by capturing the complex interactions between human behavior and environmental factors. This study highlights the need to localize the analysis of the social field to capture regional customs and specific social dynamics. This localized approach ensures that water management strategies are more relevant, context sensitive, and sustainable. This paper advocates for the wider adoption of agent-based modeling in water management, proposing a methodology that combines the engineering principles of practical problem solving and adaptive design with an understanding of the social complexities in water management. Full article

This study explores the recent emergence of traditional Korean houses and hanoks as markers of cultural capital in Seoul, South Korea. While the ownership of detached houses itself can be a symbol of wealth in Seoul, traditional-style houses have become increasingly associated with luxurious living, particularly after the successful remodeling of hanoks in metropolitan settings such as Bukchon in Seoul. This study employs the critical luxury studies method to analyze the recent rise in hanok construction/remodeling among elites, and illustrates how traditional architectural forms have become status markers. Although the regeneration of traditional houses in cities has been examined from the perspective of gentrification or touristic cultural consumption, less academic attention has been placed on the phenomenon from the perspective of the homeowners’ taste. This study examines how traditional architecture has become a form of acceptable luxury through a media analysis of published articles and interviews with the residents of hanoks. This study argues that protecting endangered traditions and rich sensory experiences function as important moralizing factors in luxury housing, indicating that sociocultural valuation becomes as significant as market valuation. Full article

The rebranding of reggaetón towards Latin urban has been criticized for tokenizing Afro-Caribbean linguistic and cultural practices as symbolic resources recruitable by non-Caribbean artists/executives in the interest of profit. Consumers are particularly critical of an audible phonological homogeneity in the performances of ethnonationally distinct mainstream performers, framed as a form of linguistic minstrelsy popularly termed a ‘Caribbean Blaccent’ that facilitates capitalization on the genre’s popularity by tapping into the covert prestige of distinctive phonological elements of Insular Caribbean Spanish otherwise stigmatized. This work pairs acoustic analysis with quantitative statistical modeling to compare the use of lenited coronal sibilant allophones popularly considered indexical of Hispano-Caribbean origins in the spoken and sung speech of four of the genre’s top-charting female performers. A general pattern of style-shifting from interview to sung speech wherein sibilance is favored in the former and phonetic zeros in the latter is revealed. Moreover, a statistically significant increased incidence of [-] across time shows the most recent records to uniformly deploy near-categorical reduction independent of artists’ sociocultural and linguistic backgrounds. The results support the enregisterment of practices popularized by the genre’s San Juan-based pioneers as a stylistic resource—a reggaetón voice—for engaging the images of vernacularity sustaining and driving the contemporary, mainstream popularity of música urbana. Full article

This paper proposes a novel ensemble approach, integrating Artificial Neural Networks (ANNs), Symbolic Regression (SR), and Decision Trees (DTs), to predict fish mortality caused by infectious diseases. The intensifying global burden of fish diseases threatens the sustainability of aquatic ecosystems and the aquaculture industry, necessitating sophisticated modelling strategies for effective disease management and control. The proposed approach capitalizes on the non-linear data modelling strength of ANNs, the explanatory power of SR, and the decision-making efficiency of DTs, offering both predictive accuracy and interpretable insights. The architecture of the proposed ensemble method is developed in two stages. In the intermediate stage, an ANN is employed to learn the complex, non-linear interactions between various biological and environmental factors impacting fish health. Additionally, SR is applied to produce a symbolic equation that effectively maps the input variables to fish mortality rates. In the final stage, a DT model is included to enhance prediction performance by capturing decision rules from the data. This hybrid approach offers superior prediction performance while also revealing meaningful biological/environmental relationships that can guide preventive and reactive interventions in the management of fish health. We evaluate the developed models using extensive real-world datasets acquired from two large Greek fish-farming units, which encompass representative disease types. The results demonstrate that our ensemble approach significantly outperforms traditional standalone models developed in our recent previous work, achieving enhanced predictive accuracy, robustness, and interpretability. Overall, this research has far-reaching implications for improving disease predictions, facilitating optimal decision-making in aquaculture management, and contributing to the sustainability of global fish stocks. Full article

The gheada and the seseo are the two pronunciations most stigmatised by the top-down standardising tradition of Galician from the mid-19th century. Social stereotypes of peasantry, ignorance, and vulgarity were built on them. Nowadays, those stereotypes are the basis for indexical pointing. These pronunciations were outlawed from schools in the past. Today, despite having been considered standard by The Royal Galician Academy since 1982, they are almost absent from the classrooms, including those of Galician language and literature. This situation is detrimental to the linguistic capital of its users as compared to that of standard speakers. Nonetheless, since the end of the 20th century, there has been a social resignification of the gheada and seseo, symbolically used to express authenticity, ethnolinguistic adherence, and/or socio-political and cultural resistance. Currently, the emergence of vernacular language ideologies (VLIs) counterbalances the weight of standard language ideologies (SLIs) on these phenomena. This article analyses the linguistic attitudes of a sample of young people towards these two dialectal varieties as opposed to the standard pronunciations. It also identifies the indexical associations of contrasting varieties and their evolution over time. For this purpose, the matched-guise technique in combination with semantic differential scales (SDSs) has been applied. The results show that whereas standard pronunciations index social success, dialectal pronunciations index solidarity. However, while the standard indexical values are very stable, a rise in dialectal ratings is observed over fifteen years, which means an improvement of the attitudes towards them. As in other European minority languages, this phenomenon indicates a process of value levelling of the linguistic varieties and the growing weight of the VLIs in late modernity in Galicia. Full article

Social innovation has been associated with contributing to ‘valuable’ rural development; however, usually, the impact of social innovation has been identified in the aftermath of its development or implementation. This might be too narrow an approach, as an ongoing social innovation process in itself may already lead to effects that contribute to regional and social changes in a local community and beyond. This paper argues that collaborative valuation processes are embedded in social innovation processes, generating effects that contribute to rural development. Focusing on a case study that exemplifies social innovation processes in agriculture and food production carried out by a rural collaborative community in southern Italy, we demonstrate how three valuation phases, such as contestations and negotiations of norms, symbolic capital accumulation and recognition of actions, as well as re-definitions of values, impact community development through joint sense-making, empowerment and societal change. Our empirical results suggest the close intertwining of both social innovation and valuation processes. The empirical results demonstrate how collective valuation processes have micro-effects on the agro-economic system, on local socio-cultural processes, and on place-making activities. Methodologically, this paper builds on ethnographic methods, including participatory observations, semi-structured interviews, oral histories, and socio-spatial analysis investigating moments of valuation embedded in daily collaborative practices. Full article

The changes on the Louisiana coast due to land loss can be understood as a process, and the social construction of these processes is highly complex. Due to this complexity, we will examine these social patterns of interpretation as well as individual experiences of coastal land loss in Louisiana within a neopragmatic meta-theoretical framework using several methods, data, researcher perspectives, forms of representation, and theories, with a special focus on the construction of coastal land loss by the media. For this purpose, comments below a YouTube video on a hurricane event on Grand Isle, Louisiana, as well as on-site interviews with people affected by coastal land loss, were qualitatively analyzed. The results were interpreted with the help of various theories such as the theory of three landscapes, Dahrendorf’s conflict theory, Bourdieu’s theory of social capital, and Luhmann’s autopoietic systems theory. The research reveals patterns of interpretation, categorization, and evaluation of processes from an internal and external perspective that are highly morally charged. Full article

The art of the Achaemenid Empire flourished in Ancient Persia from the 6th to 4th centuries BCE, and featured stone-carved monumental structures adorned with recurring zoological and floral patterns. Such representations clearly had a symbolic meaning intimately connected to religious expression and the will of deities. Considering the lack of any comprehensive analysis of botanical features, we investigate the recurring plant patterns and the variety of plants depicted. An analysis of the documentation referring mainly to monuments in the two main capitals of Darius I, Persepolis and Susa, showed the presence of certain repetitive elements, such as the so-called rosettes (composed variously of Asteraceae capitula and Nymphaea flowers), palms (Phoenix dactylifera, the tree of life), pines, flowers or bunches and metamorphic elements. Some plants are described in this paper for the first time in the context of Persian iconography, such as Mandragora officinalis in offering scenes as a symbol of fertility and protection against evil spirits, Pinus brutia var. eldarica as a symbol of immortality and elevation to the gods, and the capitula of Matricaria/Leucanthemum as solar symbols. Further interesting elements include cf. Myrtus communis in some crowns and probably cf. Ephedra sp. in offering scenes. Achaemenid art was deeply influenced by the Zoroastrian religion of ancient Persia with its great attention to nature as well as by the nearby civilizations of the Mesopotamian area and Egypt. Most elements were also associated with psychotropic or medicinal attributes, which contributed to their position as symbols of power. Full article

Ursula Le Guin’s The Word for World is Forest emerged as a reaction to the Vietnam War, which ravaged human and nonhuman lifeworlds. Le Guin offers two competing discursive systems through which to interpret human and nonhuman alterity—Terran industrial capitalism, grounded in physical and symbolic violence, and Athshean ecosocialism, rooted in an ethics of non-violence and forest-centred nominalism. Le Guin appears to suggest that both “readings” of Athshea are locked in an intractable, adversarial logic, typical of the “paranoid” reading practices that Eve Sedgwick would theorise twenty-five years later. In its sensitivity to the spectrum of negative affect covering anticipatory anxiety about forestalling pain, symmetrical suspicion, and fear of humiliation, the novella offers an uncanny prefiguration of paranoid practices. Le Guin suggests that the way out of the paranoid clash of civilisations can be found in two “reparative” reading stances—Selver’s reinterpretation and rearrangement of components of the oppressor’s culture into new, unexpected wholes (hermeneutic reassemblage) and the alien observers’ valorisation of disinterested curiosity over action as a categorical imperative (cerebral equivocity). Le Guin thus seems to offer a reparative poetics avant la lettre. Full article

Naples has been described as a symbol of the weak segregation of Mediterranean cities, which are marked by microscale segregation rather than neighborhood segregation. This paper focuses on the upper-class areas of Naples where, besides vertical segregation, other patterns of micro-segregation can be found and remain understudied. In such areas, Disadvantaged groups still concentrate into streets, blocks and enclaves of poverty that have resisted gentrification despite their location in the heart of upper-class nieghborhoods. Though self-segregation of the urban élite has sharply increased with globalization and postfordist capitalism, such patterns of segregation in well-off areas are largely unexplored. The paper is based on a mixed method. It uses census data to map the residential location of disadvantaged groups in Naples upper-class areas at the local scale. It also draws on ethnographic fieldwork to analyze the Neapolitan élites’ attitudes towards the proximity of the poor. The paper shows that the spatial proximity of the poor has long been accepted and promoted by the city élite as a way of maintaining social control over their patronage. But it is increasingly stigmatized as this control through proximity becomes more difficult for the decaying traditional Neapolitan élite. Residential proximity is now associated with increasing segregation in the use of public spaces. The paper discusses the theory of élite Urban Secession in globalization. In Naples, rather than Secession, the élite play a game of proximity and distance with the poor, using space as a means of social control. Full article

The second external cause of death from unintentional injuries is falls in people over 60 and is a worldwide Public Health problem. Associated factors are identified early in Primary Health Care. Thus, we analyze professional narratives about older adults/old age and the organization of services in the presence of fall-inducing frailty. A structured narrative was applied under the following stages: understanding the context, setting/plot/character analysis, and interpretive synthesis. Data were collected from August to November 2022, distributing 21 health professionals in three Narrative Focus Groups. In the analyses, the collective conceptions dialogued with Bourdieu’s Epistemology of field, habitus, and capital. Technical and common sense representations of older adults were simultaneously observed among the results, along with the belief of old age as a problematic life stage. Care is centered on the installed disease/ailment. Encouraging autonomy and self-care emerges in integrative health practices, which older adults underestimate. Professionals access the lives of older adults according to their habitus, which, in turn, is structured (structuring) in the disputes for installed capital. Thus, the care provided disregards subjectivities and symbolic systems associated with falls. Full article

To understand the influence of positive thinking ideology on cancer representations among physicians in the city of Medellín. Methods: This qualitative study was conducted on the basis of the theoretical and methodological elements of Corbin and Strauss’s grounded theory. Fourteen physicians were included and selected according to the criteria of maximum variation for education, years of study, and personal and family history of cancer. The information was collected through semi-structured interviews and analyzed with open, axial, and selective coding. Results: the ideology of positive thinking has managed to permeate the medical discourse and the representations that they form about the etiology and treatment of cancer. Physicians place the mind, emotions, attitude, and positive thinking as determinants of the origin of the disease and the response to therapy. To argue this link, they use two strategies: (i) a sophisticated and specialized discourse that involves relationships among thoughts, genetics, the neurological, immune and endocrine system and (ii) a mystical and less rational discourse that emphasizes the omnipotence of the mind and thoughts. In no case was the idea of positive thinking rejected or in disagreement with this style of thinking expressed. Conclusion: The fact of linking the disease with mental factors refers to the mind–body dualism and generates a responsibility of the patients on the etiology and therapeutics of the disease, as well as an erasure of the social and political determinants of cancer. The technical discourse and the symbolic capital of physicians offer scientific legitimacy to these ideas and can become performative for patients. Full article

This paper uses an ethnographic approach to explore the religious practices of the modern religious organization called the Mahamevnawa Buddhist Temple. This study aims to investigate the spiritual information practices of both monks and devotees of the temple. The findings reveal that participants’ religious practices lead to a range of outcomes, expressed in terms of the Bourdieusian notion of capital, with karmic capital emerging as a very important outcome of these practices. An essential argument posited by the author pertains to the distinctive nature of karmic capital—a hybrid manifestation of capital that is intricately interwoven with cultural and symbolic capital. Unlike the conventional influence of economic capital or social affiliations, the potency of karmic capital hinges upon a distinct paradigm. However, the fact that a resource gives power within a society also applies to karmic capital too. Furthermore, the author underscores the epistemological standing of karmic capital, which derives its essence from the principal sociological forms of capital—namely, economic, cultural, and social forms. This article also delves into the characteristics of karmic capital and its transformative nature. A key contribution of this study lies in its recognition of the impact of cultural norms on the consequences of information science. Full article

Symbolic encoding of information is the foundation of Shannon’s mathematical theory of communication. The concept of the informational efficiency of capital markets is closely related to the issue of information processing by equity market participants. Therefore, the aim of this comprehensive research is to examine and compare a battery of methods based on symbolic coding with thresholds and the modified Shannon entropy in the context of stock market efficiency. As these methods are especially useful in assessing the market efficiency in terms of sequential regularity in financial time series during extreme events, two turbulent periods are analyzed: (1) the COVID-19 pandemic outbreak and (2) the period of war in Ukraine. Selected European equity markets are investigated. The findings of empirical experiments document that the encoding method with two 5% and 95% quantile thresholds seems to be the most effective and precise procedure in recognizing the dynamic patterns in time series of stock market indices. Moreover, the Shannon entropy results obtained with the use of this symbolic encoding method are homogenous for all investigated markets and unambiguously confirm that the market informational efficiency measured by the entropy of index returns decreases during extreme event periods. Therefore, we can recommend the use of this STSA method for financial time series analyses. Full article