Intersection Of Spaces Research Articles

Connectivity-aware Graph: A planar topology for 3D building surface reconstruction

Multi-view Stereo (MVS) meshes suffer from occlusions or missing data, making most surface reconstruction methods invalid. Due to data imperfections, existing methods, just like PolyFit, have made a trade-off between reconstruction accuracy and time consumption. We propose a novel approach that automatically reconstructs a building surface model from raw triangular mesh with data incompleteness. Unlike existing methods that extract high-quality primitives, our method focuses on assemblies of primitives to control the level of geometric detail in the reconstructed models. We design a topological relationship of the primitives to form a plane connection graph. To be precise, we first combine the scalability of shapes with plane primitives. Then strong and soft connections between primitives are constructed by calculating the confidence of the plane intersection in space. Furthermore, the topological relations of all primitives are encoded into an undirected graph. Finally, a watertight and manifold model is extracted from the faces of a candidate set by energy minimization. Experiments on the Helsinki 3D dataset demonstrate the superiority of our method in time consumption and reconstruction error, as measured by Hausdorff distance. Our method outperforms other primitive-based algorithms in handling non-planar structures. Even when dealing with imperfect data, a watertight model is still obtained.

Privacy and Trust in the Internet of Vehicles

The Internet of Vehicles aims to fundamentally improve transportation by connecting vehicles, drivers, passengers, and service providers together. Several new services such as parking space identification, platooning and intersection control—to name just a few—are expected to improve traffic congestion, reduce pollution, and improve the efficiency, safety and logistics of transportation. Proposed end-user services, however, make extensive use of private information with little consideration for the impact on users and third parties (those individuals whose information is indirectly involved). This article provides the first comprehensive overview of privacy and trust issues in the Internet of Vehicles at the service level. Various concerns over privacy are formalised into four basic categories: personal information privacy, multi-party privacy, trust, and consent to share information. To help analyse services and to facilitate future research, the main relevant end-user services are taxonomised according to voluntary and involuntary information they require and produce. Finally, this work identifies several open research problems and highlights general approaches to address them. These especially relate to measuring the trade-off between privacy and service functionality, automated consent negotiation, trust towards the IoV and its individual services, and identifying and resolving multi-party privacy conflicts.

Elastoplastic Integration Method of Mohr-Coulomb Criterion

A new method for implicit integration of the Mohr-Coulomb non-smooth multisurface plasticity models is presented, and Koiter’s requirements are incorporated exactly within the proposed algorithm. Algorithmic and numerical complexities are identified and introduced by the nonsmooth intersections of the Mohr-Coulomb surfaces; then, a projection contraction algorithm is applied to solve the classical Kuhn–Tucker complementary equations which provide the only characterization of possible active yield surfaces as a special class of variational inequalities, and the actual active yield surface is further determined by iteration. The basic idea is to calculate derivatives of the yield and potential functions with the expressions in the principal stresses and perform the return manipulations in the general stress space. Based on the principal stress characteristic equation, partial derivatives of principal stresses are calculated. The proposed algorithm eliminates the error caused by smoothing the corner of Mohr-Coulomb surfaces, avoids the numerical singularity at the intersections in the general stress space, and does not require the stress transformation needed in the principal stress space method. Lastly, several numerical examples are given to verify the validity of the proposed method.

We Story: Decoloniality in Practice and Theory

Western research and education draw heavily on evidence-based approaches underpinned by positivism. Reliance on this scientific approach informs what is to be counted, measured, and tested—what can be “known.” In our experience, evidence generated using this approach does not always bring the most useful outcomes in our diverse, naturalistic settings. In fact, often the proffered solution can distance and dehumanize the very people expected to be beneficiaries. In this article, we, as researchers and educators from different cultural and professional backgrounds in the “post-colonial” South Pacific, pose an alternative to this Western approach. We engage in a story saturated process akin to collaborative auto-ethnography. We first undertake a process of owning our stories, critically reflecting upon ourselves and how we approach evidence. In the context of values-driven, dialogical relationships, we experiment with intersectionality, interdisciplinarity, and experiences of time and space to critically explore our practice and experience of decoloniality and transformation. Then, through sharing our stories, we critically reflect upon creative, culturally relevant practices. These stories include using poetry in social work education and health research, cake art, and social work storytelling. We acknowledge cultural story forms, collaboration, and performance in a higher education setting. These experiences lead to creating new stories. We share examples of change; we “talk up” to and challenge rationalist, evidence-based approaches in our respective professional spaces. We examine relationality and Indigenous epistemology underpinning our use of story. We present the power of story as a process of transformation toward decoloniality of theory and practice.

Coordinated Traffic Signal Design for Major Intersections in Sylhet City

Traffic delay is a very common phenomenon in urban intersections where the traffic volume on the approach roads is high. Coordinated traffic signals based on real-time traffic can be very useful for minimizing intersection traffic delays. Therefore, this study is aimed to investigate the prospect of a coordinated signal system for the busiest and most closely spaced intersections (Ambarkhana, Chowhatta, and Zindabazar) in the Sylhet city of Bangladesh. This signal system will allow a continuous flow of traffic through moving vehicles between successive coordinated intersections so that the vehicles that running at the design speed can pass through the coordinated intersections without a significant halt. An isolated signal is designed for three intersections and linked up to them based on offset values (time to travel from one intersection to another). Phase splits were adjusted using the Time-Space diagram.

Intensifying the spatial resolution of 3D thermal models from aerial imagery using deep learning-based image super-resolution

Nowadays, 3D thermal models can play an important role in buildings' energy management while acquiring multisource data to generate a high-resolution 3D thermal model. Consequently, in this article, a method for intensifying 3D thermal model using deep learning-based image super-resolution is presented. In the proposed method, first, the enhanced deep residual super-resolution (EDSR) deep network is re-trained based on thermal aerial images. Second, the resolution of low-resolution thermal images is enhanced using the newly trained network. Finally, the state-of-the-art structures from motion (SfM), semi global matching (SGM) and space intersection are utilized to generate intensified 3D thermal model from the resolution enhanced thermal images. Spatial evaluations indicate a 5% increase in edge-based image fusion metric (EFM) for the intensified 3D model. Besides, the evaluations show that the modulation transfer function (MTF) curves of the intensified 3D thermal model are closer to a reference model against the original 3D thermal model. Highlights A 3D thermal model intensification solution using EDSR is proposed which is independent of hardware techniques and multisource data. Considering the importance of edge sharpness in the intensified 3D thermal model, the quality of edges is assessed using MTF curves and the EFM metric. In comparison to the original 3D thermal model, the MTF curves of the intensified 3D thermal model are closer to the MTF curve of the high-resolution 3D model. The EFM metric shows higher values for MTF curves of the intensified 3D thermal model against MTF curves of the original 3D thermal model.

PSYCHOLOGICAL FACTORS OF THE DISCOURSE’S ACTUALIZATION

In this article there were proposed psychological factors of the discourse’s actualization. They are, first of all, psycholinguistic presupposition in the process of communication, quasi- communication or understanding the text is a special kind of logical mastering of information, cognitive explication of frames by means of actualization of a common fund of knowledge of participants in communication about the world, its organization, the place of a person in it and others. Psycho-linguistic presupposition in a case of human implementation of communication or quasi- communication in the cross-cultural environment is characterized by common experience, a common thesaurus, updating of common preliminary information about a certain phenomenon, event, state of affairs, etc., which communicants have. Thanks to psycholinguistic presupposition, discourse creates a zone of intersection of cognitive spaces of communication of participants, which are also narrow from the point of view of their expanding into the process of communication or quasi-communication. It was shown that in the Internet communication psycho-linguistic presuppositions are cognitive in their content. The existence of all possible presuppositions of the person forms its outlook, makes it possible for a broader communicative space. The absence of joint presuppositions makes it impossible for people to understand each other, makes their communication more and more difficult. In this case, on the contrary, people who have joint pressupositions without any complication understand the information, which for representatives of other linguistic culture may seem completely “opaque”, difficult for understanding. Consequently, psycholinguistic presupposition in the process of communication or quasi-communication is an implicit component of the meaning of the message (statement) that is real, therefore, this message (statement) can not, in general, be perceived as semantically abnormal one or inappropriate in a certain area of communication or quasi-communication. The second factor was psycholinguistic semantic presuppositions. We analyzed it as a certain semantic component of the message (statement, judgment), the inaccuracy of which in a particular situation makes the message abnormal or inappropriate. We proved, that in the space of communication or quasi-communication there were actualized pragmatic psycho-linguistically marked presupposition, which were a component of the message, the speech genre, and discourse (or a text), were directly related to subjective factors of communication (orientation in different situations of communication or quasi-communication, actualization of social, cognitive, gender, etc., characteristics of people in one communicative act), the absence of which converted a message, speech genre, discourse (or a text), communication in general into inappropriate – such as insincere, unnatural, provocative, that did not conceal positive conditions, which made a success in a whole.

Space in the spotlight: a performance-centered approach to space as performer in rural cemeteries

ABSTRACT The growing body of scholarship exploring nonhuman participation in performance and organizational space has made it clear that performance studies can offer a new perspective on space as a performer. Taking performance as the unit of analysis, this paper proposes engaging sites at the intersection of space, time, and culture to advance organizational dimensions of space by recognizing the agency of space as a performer. Using observational data gathered from rural cemeteries, this study finds a performance-centered approach affords a more nuanced understanding of sense-making for the study of space.

Sphere Partition Function of Calabi–Yau GLSMs

The sphere partition function of Calabi–Yau gauged linear sigma models (GLSMs) has been shown to compute the exact Kähler potential of the Kähler moduli space of a Calabi–Yau. We propose a universal expression for the sphere partition function evaluated in hybrid phases of Calabi–Yau GLSMs that are fibrations of Landau–Ginzburg orbifolds over some base manifold. Special cases include Calabi–Yau complete intersections in toric ambient spaces and Landau–Ginzburg orbifolds. The key ingredients that enter the expression are Givental’s I/J-functions, the Gamma class and further data associated to the hybrid model. We test the proposal for one- and two-parameter abelian GLSMs, making connections, where possible, to known results from mirror symmetry and FJRW theory.

Algebraic reduced genus one Gromov–Witten invariants for complete intersections in projective spaces, Part 2

In Lee and Oh (Preprint, arXiv:1809.10995, 2018), we provided an algebraic proof of Zinger's comparison formula (Geom. Topol. 12 (2008), no. 2, 1203–1241; J. Differential Geom. 83 (2009), no. 2, 407–460) between genus one Gromov–Witten invariants and reduced invariants when the target space is a complete intersection of dimension 2 or 3 in a projective space. In this paper, we extend the proof in Lee and Oh (Preprint, arXiv:1809.10995, 2018) to all dimensions and to descendant invariants.

Cluster consensus on matrix-weighted switching networks

This paper examines cluster consensus for multi-agent systems on matrix-weighted switching networks. Necessary and/or sufficient conditions under which cluster consensus can be achieved are obtained, as well as quantitative characterization of the steady-state of the cluster consensus. Specifically, when the underlying network switches amongst a finite number of networks, a necessary condition for cluster consensus on matrix-weighted switching networks is derived; moreover, it is shown that the steady-state of the nodes lies at the intersection of the null spaces of the matrix-valued Laplacians of the corresponding switching networks. Furthermore, when the underlying network switches amongst an infinite number of networks, the matrix-weighted integral network is employed to provide sufficient conditions for cluster consensus; analogous to the previous case, the quantitative characterization of the corresponding steady-state of the nodes pertains to the null space analysis of matrix-valued Laplacian of the “integral” network. Lastly, conditions for bipartite consensus of matrix-weighted switching networks are provided. Simulation examples demonstrate the presented theoretical results.

Competing climate spectacles in the amplified public space

The climate change debate is finding new expressions through political protests and demonstrations, during which a plurality of climate narratives emerges. While protests such as Extinction Rebellion have had a strong physical manifestation, involving many people showing up in concrete locations, they have also been facilitated and mediated virtually. In this paper, we examine the spectacle generated when divergent discourses on climate change compete for attention in spaces that are simultaneously urban and virtual. The paper is based on empirical evidence from events surrounding London Fashion Week 2019, focusing on the political mobilization by Extinction Rebellion Boycott Fashion (XRBF) and other groups. Discussing this changing nature of urban protest spectacle, we point to the emergence of an ‘amplified public space’ shaped at the intersection of material and virtual spaces of the city. Both the fashion industry and XRBF employ techniques of spectacle in their strategies to advance their respective climate change and sustainability narratives. We argue that XRBF, in particular, has managed to influence the climate change debate by strategically staging spectacular protest events that are both facilitated and played out in virtual space.

Characterizing bipartite consensus on signed matrix-weighted networks via balancing set

In contrast with the scalar-weighted networks, where bipartite consensus can be achieved if and only if the underlying signed network is structurally balanced, the structural balance property is no longer a graph-theoretic equivalence to the bipartite consensus in the case of signed matrix-weighted networks. To re-establish the relationship between the network structure and the bipartite consensus solution, the non-trivial balancing set is introduced which is a set of edges whose sign negation can transform a structurally imbalanced network into a structurally balanced one and the weight matrices associated with edges in this set have a non-trivial intersection of null spaces. We show that necessary and/or sufficient conditions for bipartite consensus on matrix-weighted networks can be characterized by the uniqueness of the non-trivial balancing set, while the contribution of the associated non-trivial intersection of null spaces to the steady-state of the matrix-weighted network is examined. Moreover, for matrix-weighted networks with a positive–negative spanning tree, necessary and sufficient condition for bipartite consensus using the non-trivial balancing set is obtained. Simulation examples are provided to demonstrate the theoretical results.

A Critical Race Spatial Analysis of Rural Latinx Students’ College (In)Opportunities and Conscious Choices during the COVID-19 Pandemic

ABSTRACT The ongoing global COVID-19 pandemic has exacerbated educational inequities for students from institutionally marginalized communities. This article specifically examines the college (in)opportunities and conscious choices of rural Latinx students from California’s San Joaquin Valley as they pursued higher education during the pandemic. This article applies a Critical Race Spatial Analysis (CRSA) framework to analyze the intersections of race, space, and college (in)opportunity for rural Latinx students. Additionally, this article draws on a college-conocimiento framework to argue that despite navigating deep-seated sociospatial inequities, rural Latinx students still enrolled in college. Using Chicana/Latina feminist pláticas and geographic information systems (GIS), this article takes a mixed methods research approach to analyze rural Latinx students’ college (in)opportunities and conscious choices during the COVID-19 pandemic, which disproportionately impacted their im/migrant farm working families and communities. Results from the pláticas and maps revealed that rural Latinx students lacked access to quality technological devices, internet infrastructure, high speed internet, and college information and guidance. Still, rural Latinx students enrolled in colleges that aligned with their and their families’ financial and emotional realities during the ongoing pandemic. The article concludes by providing rural Latinx-serving school districts with recommendations for increasing college access amid and beyond the COVID-19 pandemic.

Capture and detumble of a non-cooperative target without a specific gripping point by a dual-arm space robot

This paper focuses on the control strategy of a dual-arm space robot to capture and detumble a non-cooperative satellite without a specific gripping point. First, an elastic hemispherical claw was designed to reduce the collision impacts and adjust the capture position, and its contact dynamics and capture ability were verified by ground experiments. Analysis of the position constraints led to the proposal of a compliant control scheme to achieve stable capture without a contact-force sensor. Subsequently, a modified adaptive sliding mode based prescribed trajectory tracking control (PTTC) and null space intersection approach was proposed to achieve target detumbling under the actuator constraints. The control system stability was analyzed via the Lyapunov method. Finally, numerical simulations were employed to validate the effectiveness and correctness of the strategy. Results showed that, a large inertia target could be steadily captured and detumbled within 80 s.

Dynamical Moduli Spaces and Polynomial Endomorphisms of Configurations

A portrait is a combinatorial model for a discrete dynamical system on a finite set. We study the geometry of portrait moduli spaces, whose points correspond to equivalence classes of point configurations on the affine line for which there exist polynomials realizing the dynamics of a given portrait. We present results and pose questions inspired by a large-scale computational survey of intersections of portrait moduli spaces for polynomials in low degree.

Men and masculinities studies in Vietnam: A brief review

AbstractIn recent years, men and masculinities in Southeast Asia has begun to receive more attention from scholars as the result of increasing attention to intersections of race, gender space, colonialism, and place in countries such as Vietnam. This article provides an overview of current research on men and masculinities in Vietnam. It finds research on Vietnamese masculinities is predominantly understood through (i) concepts of Confucianism, with a particular focus on traditional ideas about gender and gender relations in kinship structures; (ii) considerations of Vietnamese masculinities post Đổi Mới (Renovation) and the impact of women's engagement in the labor market; and (iii) a focus on men as “at risk” or vulnerable, including a focus on alcohol consumption and engagement in domestic violence. We highlight limited focus in areas of sexuality and sexual practices, reflexive engagements with concepts of masculinity, focus on men residing in urban centres, considerations of bodywork and body project practices, and an overall Western approach to the study of masculinity in Vietnam. We conclude with a call for further research on men and masculinities in Vietnam framed through postcolonial epistemologies and research methodologies.

Foreclosed futures and entangled timelines: conceptualization of the ‘future’ among Syrian newcomer mothers in Canada

ABSTRACT Scholars have focused significant attention on geographic aspects of forced migration, as well as the economic, psychological, and cognitive outcomes of refugees’ movement across space. Less attention has been paid to temporal aspects of forced migration, particularly after refugees’ resettlement in a host society. Using semi-structured interviews with 41 Syrian mothers who recently arrived in Canada, I contribute to building theory on temporal dimensions of forced migration through an analysis of how refugee mothers conceptualise both their children’s and their own futures. First, I show how mothers’ perceptions of the future are heavily shaped by cultural and religious orientations of divine control, which may be out of sync with norms in their host society. I also identify two patterns demonstrating how space and time intersect. Displaced mothers deliberately ‘foreclose’ their own timeline in order to focus on their children’s future in Canada, feeling like their ‘selves’ could only grow in the former geographic space. Moreover, mothers do not separate their future projections from the present in Canada or from the past in Syria, leading to ‘entangled timelines.’ These findings suggest that scholarship on forced migration may continue to benefit from attention to how time and temporal experiences shape outcomes.

Veterinary care deserts: what is the capacity and where is it?

Introduction: Access to veterinary care is a complex issue that lies at the intersection of socioeconomics, culture, and space. Although there has been substantial research that has explored factors that impede access to care, the issue has not been well addressed from a geographic perspective. Access deserts is a familiar concept that has been applied to human health care, access to nutritious foods, etc. Thus, there is value in conceptualizinsg access to veterinary care through the same lens. This research aims to advance the effort of identifying veterinary care deserts by specifying normative values for two fundamental parameters: the ratio of care providers to measures of the population and the catchment of clinics. Methods: Total employees at veterinary clinics were aggregated at the county level and normalized by different measures of human and companion animal population. All clinic employees are included under the assumption that increased support staff increases the overall care capacity. Weighted means were generated and reported for each approach. The number of veterinary clinic employees needed in each county in order to reach the weighted mean for the overall country is also reported both at the county level and state level. Clinic catchment was measured by evaluating the mean distance traveled using data from a large number of clinics and clinic clients. The data were further analyzed using Rural Urban Commuting Areas (RUCA) classifications. Results: Veterinary employee shortages were observed ranging from 20,000 to 60,000 employees depending on how the data are viewed. Parameters for the weighted mean number of employees were reported in a detailed chart. Results of the distance analysis indicate that most people travel between 2 and 6 miles to reach clinics. Conclusion: This research indicates spatial disparities in the distribution of veterinary staff. The parameters of the ratio of employees to population measures and distance traveled can both be used in future research that aims to identify local and regional veterinary care deserts. This analysis could be further enhanced by the addition of factors such as socioeconomic data or social determinants of health to further define and identify care deserts.

A high-resolution numerical well-test model for pressure transient analysis of multistage fractured horizontal wells in naturally fractured reservoirs

In this study, a high-resolution numerical well-test model based on hybrid discrete fracture methods for pressure transient analysis of multistage fractured horizontal wells in naturally fractured reservoirs is proposed. Given the complexity of gridding for a numerical transient model, a new type of hybrid grid system honoring complex geometries of high-velocity transient flow near wellbore and hydraulic fractures is developed. Meanwhile, the methods of identifying fracture intersections in 3D unstructured space, transmissibility corrections and stochastic fracture network generation algorithm are proposed to greatly improve the accuracy and efficiency of capturing the pressure transients in complex fracture networks. After comparison with the well-test software KAPPA, it shows that the model can not only accurately reproduce the complex 3D convergence of flow regimes but also has a much better computational performance. Then, the type curves of a multistage fractured horizontal well with complex fracture networks and the sensitivity analysis of nonuniform properties of fracture networks are developed and analyzed in detail. The results show that the early-time horizontal radial flow and dip are positively related to the properties of natural fractures, and the fluid contribution and pressure distribution mainly depend on fracture connectivity rather than fracture number. The orthogonal fracture connections can result in stronger fluid supply and less fracture interference. Besides, the fracture linear flow and first/second bilinear flow are mainly affected by hydraulic and natural fractures, respectively. Finally, it proves that the proposed model can be much more efficient than KAPPA in history match for well-test data by an actual fractured field case.