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Academic literature on the topic 'Spatial links'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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Journal articles on the topic "Spatial links"

1

Rastegar, J. "On the Galloway-Type of Spatial Mechanisms." Journal of Mechanical Design 112, no. 4 (December 1, 1990): 466–71. http://dx.doi.org/10.1115/1.2912633.

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The Galloway mechanism is a plane four-bar, drag-link-type linkage with one pair of equal-length shorter links, and one pair of equal-length longer links, forming a rhomboid geometry. The short links constitute the frame and the input links. In a Galloway mechanism, two full rotations of the input link result in a single rotation of the output link. In this paper, the Galloway mechanism is analyzed and the rules governing its motion are found. The conditions necessary for the existence of a Galloway-type spatial mechanism are then determined. As an example, the necessary relationships between the geometric parameters of a spatial RRRSR mechanism are derived. A numerical example is included.

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JANG, YEONHEE, and KANAKO OSHIRO. "SYMMETRIC QUANDLE COLORINGS FOR SPATIAL GRAPHS AND HANDLEBODY-LINKS." Journal of Knot Theory and Its Ramifications 21, no. 04 (April 2012): 1250050. http://dx.doi.org/10.1142/s0218216511010024.

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In this paper, colorings by symmetric quandles for spatial graphs and handlebody-links are introduced. We also introduce colorings by LH-quandles for LH-links. LH-links are handlebody-links, some of whose circle components are specified, which are related to Heegaard splittings of link exteriors. We also discuss quandle (co)homology groups and cocycle invariants.

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Litvin, F. L., P. Fanghella, Jie Tan, and Yi Zhang. "Singularities in Motion and Displacement Functions of Spatial Linkages." Journal of Mechanisms, Transmissions, and Automation in Design 108, no. 4 (December 1, 1986): 516–23. http://dx.doi.org/10.1115/1.3258763.

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A new approach for the determination of singularities and displacement functions of spatial linkages is proposed. Singularities in motion occur at positions where an overconstrained group of links becomes movable while the driving link is fixed. Two alternative solutions for the conditions of the mobility of the link group are proposed: (i) The first one is based on the differentiation of matrices which describe the coordinate transformation; (ii) The second one is based on the presentation of the link motion as a screw motion. It is proven that singularities in motion occur in the cases where: (i) Some or all links of the overconstrained group of links are aligned; (ii) The links of the group are not aligned but they form a mobile configuration, (iii) A Certain number of axes of revolute or cylindrical pairs belong to a ruled surface. Cases (i) and (ii) cover the situations when the oscillating driving link reaches its extreme positions. The determination of displacement functions is based on the modeling of the linkage by two open kinematic chains formed: (i) by links of the overconstrained group of links and (ii) the driving link and the frame. The structure of equations for the link displacements is related with the structure of the velocity Jacobian for the overconstrained group and simplifies the computation procedure. The proposed methods are illustrated with examples of RCRCR and 7R linkages.

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Driver, Jon, and Charles Spence. "Cross–modal links in spatial attention." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 353, no. 1373 (August 29, 1998): 1319–31. http://dx.doi.org/10.1098/rstb.1998.0286.

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A great deal is now known about the effects of spatial attention within individual sensory modalities, especially for vision and audition. However, there has been little previous study of possible crossmodal links in attention. Here, we review recent findings from our own experiments on this topic, which reveal extensive spatial links between the modalities. An irrelevant but salient event presented within touch, audition, or vision, can attract covert spatial attention in the other modalities (with the one exception that visual events do not attract auditory attention when saccades are prevented). By shifting receptors in one modality relative to another, the spatial coordinates of these crossmodal interactions can be examined. For instance, when a hand is placed in a new position, stimulation of it now draws visual attention to a correspondingly different location, although some aspects of attention do not spatially remap in this way. Crossmodal links are also evident in voluntary shifts of attention. When a person strongly expects a target in one modality (e.g. audition) to appear in a particular location, their judgements improve at that location not only for the expected modality but also for other modalities (e.g. vision), even if events in the latter modality are somewhat more likely elsewhere. Finally, some of our experiments suggest that information from different sensory modalities may be integrated preattentively, to produce the multimodal internal spatial representations in which attention can be directed. Such preattentive crossmodal integration can, in some cases, produce helpful illusions that increase the efficiency of selective attention in complex scenes.

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Liu, Junli, Miaomiao Pan, Xianfeng Song, Jing Wang, Kemin Zhu, Runkui Li, Xiaoping Rui, Weifeng Wang, Jinghao Hu, and Venkatesh Raghavan. "Filtering Link Outliers in Vehicle Trajectories by Spatial Reasoning." ISPRS International Journal of Geo-Information 10, no. 5 (May 14, 2021): 333. http://dx.doi.org/10.3390/ijgi10050333.

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Vehicle trajectories derived from Global Navigation Satellite Systems (GNSS) are used in various traffic applications based on trajectory quality analysis for the development of successful traffic models. A trajectory consists of points and links that are connected, where both the points and links are subject to positioning errors in the GNSS. Existing trajectory filters focus on point outliers, but neglect link outliers on tracks caused by a long sampling interval. In this study, four categories of link outliers are defined, i.e., radial, drift, clustered, and shortcut; current available algorithms are applied to filter apparent point outliers for the first three categories, and a novel filtering approach is proposed for link outliers of the fourth category in urban areas using spatial reasoning rules without ancillary data. The proposed approach first measures specific geometric properties of links from trajectory databases and then evaluates the similarities of geometric measures among the links, following a set of spatial reasoning rules to determine link outliers. We tested this approach using taxi trajectory datasets for Beijing with a built-in sampling interval of 50 to 65 s. The results show that clustered links (27.14%) account for the majority of link outliers, followed by shortcut (6.53%), radial (3.91%), and drift (0.62%) outliers.

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Rao, A. C. "On the Flexibility of Spatial Kinematic Chains." Transactions of the Canadian Society for Mechanical Engineering 10, no. 4 (December 1986): 213–18. http://dx.doi.org/10.1139/tcsme-1986-0025.

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A number of distinct or non-isomorphic kinematic chains exist for a specified number of links and joints. For example, sixteen distinct chains can be obtained with eight links and two hundred and thirty chains with ten links having a single degree of freedom. Similarly, many space mechanisms can be formed with four links and joints having different degrees of freedom. So far no measure is available to know which of these possesses greater mobility or flexibility. Flexibility is not to be confused with the degree of freedom. Intuitively one feels that a six-link chain has greater flexibility than a four-bar chain both having the same degrees of freedom. Though the mobility of a chain increases with the number of links one is not sure how the structural arrangement, type of links and joints, their numbers and sequence etc. influence the same. Combining graph theory with the concepts of probability, simple formulae are developed to investigate the relative merits of spatial and planar kinematic chains. The greater the flexibility or mobility of the chain, the higher is the ability to meet the motion requirements, i.e., a chain having greater entropy can be expected, say, to reproduce a given function more accurately.

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Li, Qing, William H. K. Lam, and Mei Lam Tam. "Vehicle Travel Time Prediction in Spatio-Temporal Space." Applied Mechanics and Materials 253-255 (December 2012): 1662–65. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.1662.

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It is recognized that travel times on a link are temporally correlated with its travel times of previous time periods. Also, the link travel time are spatially correlated by travel times on its neighboring links. Based on such temporal and spatial correlations, a new method is proposed for travel time prediction in urban roads. The proposed method is capable of rapidly predicting the link travel time in the near future. For validation of the proposed method, the temporal and spatial variance-covariance of travel times on related links are employed together with historical travel time data. It is found that the proposed method is able to provide more accurate travel time prediction.

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JIN, XIAN'AN, and FUJI ZHANG. "ALEXANDER POLYNOMIAL FOR EVEN GRAPHS WITH REFLECTIVE SYMMETRY." Journal of Knot Theory and Its Ramifications 17, no. 10 (October 2008): 1241–56. http://dx.doi.org/10.1142/s0218216508006610.

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Based on the connection with Alexander polynomial of special alternating links, Murasugi and Stoimenow introduced the Alexander polynomial of even graphs. In this paper, we study the Alexander polynomial of spatial even graphs with reflective symmetry. Roughly speaking, we prove that the Alexander polynomial of one half of a spatial even graph with reflective symmetry is a divisor of that of the whole spatial even graph. Then, we apply the result to a family of special alternating links, expressing the Alexander polynomial of such a link as the product of Alexander polynomials of two smaller special alternating links derived from the two isotopic "halves" of the original link.

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Spence, Charles, and Jon Driver. "Audiovisual links in exogenous covert spatial orienting." Perception & Psychophysics 59, no. 1 (January 1997): 1–22. http://dx.doi.org/10.3758/bf03206843.

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Spence, Charles, and Jon Driver. "Audiovisual links in endogenous covert spatial attention." Journal of Experimental Psychology: Human Perception and Performance 22, no. 4 (1996): 1005–30. http://dx.doi.org/10.1037/0096-1523.22.4.1005.

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Dissertations / Theses on the topic "Spatial links"

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Spence, Charles J. "Audiovisual links in attention." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264512.

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Pennington, Sandra Lynn. "Automatic geometric modeling of spatial mechanism links." Thesis, Virginia Polytechnic Institute and State University, 1986. http://hdl.handle.net/10919/91056.

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This thesis introduces GENMOD, a collection of subroutines which allow automatic geometric modeling of 3-D models for spatial links or linkages given a minimum amount of information as input. The subroutines utilize the CADCD (CADAM, Inc.) geometry interface software to enter 3-D data directly into the CAD/CAM database. Wire-frame and surface models are produced. Input is accepted from user created files with a standardized format allowing the GENMOD subroutines to be implemented regardless of the synthesis and analysis routines used. The realistic visualization of a mechanism during the synthesis and analysis process can help the mechanism designer to eliminate unacceptable linkage configurations in the early design stages thereby saving time and money. A complete description of the subroutines is provided in addition to sample graphic output.
M.S.

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Kennett, Steffan Anthony. "Links in spatial attention between touch and vision." Thesis, Birkbeck (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343623.

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Newman, Lisa J. "MYB misexpression links the spatial control of lignification with photomorphogenesis." Thesis, University of Oxford, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365719.

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Szabo, Melinda Dora. "Adaptive gain spatial receiver for wide dynamic range communication links." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/130198.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, May, 2020
Cataloged from student-submitted PDF of thesis.
Includes bibliographical references (pages 317-323).
Wireless optical communication facilitates high-speed transmission across long distances. However, time-varying and spatially-dependent attenuation through freespace channels due to scattering impedes operation for many wide dynamic range links. In the atmosphere, communication is often limited to short transmission times when optimal power is delivered to the detector, as the distance and channel conditions between ground terminals and airborne or space systems changes constantly. This effect is even more apparent in oceans, where optical attenuation varies so drastically that it has hindered practical implementation of high-speed communication undersea. To accommodate the wide range of input powers, a novel adaptive gain spatial receiver is developed in this thesis. The designed device replaces multiple detector functions of an existing underwater laser communication system with an adjustable gain and sensitivity receiver for long-range or high-rate transmissions. The novel receiver also provides spatial resolution for improved efficiency and performance. In preliminary laboratory tests, a proof-of-concept setup validates simulation expectations and informs future terminal integration. Using the new system, a wide range of input power across six orders of magnitude down to single photon detection and data rates up to 1Gb/s are attainable, which will enable future tests in the open ocean.
by Melinda Dora Szabo.
M. Eng.
M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science

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Li, Xuan. "Planning for Spatial Analysis of Links between Parkinson Disease and Pesticide Exposure." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1310051225.

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Wardle, Perry. "Economic and social linkages in a spatial cluster of traditional small manufacturing firms." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324453.

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Read, Jessica Sian. "Development of methodology for identifying spatial links between environmental exposure and disease prevalence." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54602/.

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The recent increased availability of geographically linked individual level health outcome data and improvements in exposure mapping techniques, which furnish point exposure estimates, motivate the development of spatial statistical methodology that takes full advantage of individual level data. Kernel density estimation is a powerful tool for mapping the risk of a health outcome that uses individual level data. Development of kernel density methodology has provided a global significance test for regions of elevated relative risk and a test for the spatial association between a health outcome and environmental exposure. Comparisons with some existing spatial statistical techniques highlight the strengths of the kernel density based methods. Moreover, simulation exercises indicate that the kernel density test for spatial association is a more powerful testing procedure than the most popular standard test proposed by Stone. Kernel density estimation and the global significance test for regions of elevated relative risk are illustrated for congenital malformations around a landfill site and sex ratios in Cardiff and the Vale of Glamorgan. The application of these methodologies revealed that both birth outcomes had a statistically significant heterogeneous spatial pattern over the relevant study regions even after adjustment for known confounders. Good quality, high resolution environmental exposure data was unavailable and prevented a direct application of the kernel density test for spatial association with a health outcome. However, the test can be applied to any two relative risk/density surfaces and was used to compare the spatial patterns of chromosomal and non-chromosomal anomalies in the region of the Nant y Gwyddon landfill site. It was concluded that the spatial patterns for the two sets of anomalies were different. The test was also used to assess the quality of the adjustment for confounders when producing expected risk surfaces and the adjustment was found to be adequate.

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Begg, Tracey. "Spatial and temporal dynamics in the development of invading cynipid communities in Britain." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/3992.

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The British Isles have been invaded by 12 alien cynipid gallwasps over the past 150 years. The first 4 of these species have been studied in depth and represent a model system in phytophagous insect community structure. In this thesis, I extend this research programme to incorporate 8 further invaders. I examine recent changes in the distribution of invading oak gallwasps in Britain and spatial patterns in the composition of the associated communities of phytophagous cynipid inquilines and parasitoids. I use fully quantitative webs to assess the diversity and strength of trophic interactions between native and invading species and assess the potential for apparent competition between gallwasps mediated by shared natural enemies. Of the first 4 invaders to be studied, 3 have expanded their range since 1991/2. Three of these 4 species are now well established in Scotland, while Andricus corruptrix remains confined to England. Four new invaders (A. aries, A. lucidus, A. grossulariae, Aphelonyx cerricola) are established in southern England and are spreading. Rates of range expansion vary across species (between means of 3.3 and 24.4 km per year), and may be correlated with variation in lifecycles and abundance. The four newest invaders (Neuroterus saliens, Plagiotrochus australis, P. coriaceus, P. quercusilicis) are currently restricted to their sites of first record. Previous studies on one of the early invaders, Andricus quercuscalicis, identified south to north and east to west declines in community species richness and in the abundance of specific parasitoid species. I find that: 1) Parasitoid associations with the asexual galls of A. quercuscalicis track inquiline recruitment to this host. 2) The longitudinal and latitudinal gradients in parasitoid species richness demonstrated in previous work are no longer apparent, suggesting that younger northern communities may be converging on their older southern counterparts. 3) Inquilines show increasing survivorship with distance from the original centre of their distribution in south east England, suggesting at least temporary exploitation of enemy-free space. 4) The recently invading Andricus and Aphelonyx species have all rapidly recruited parasitoids and inquilines. Fully quantitative webs were constructed for 4 sites in England and Scotland incorporating both native and invading cynipids. I tested the hypothesis that newly arriving gallwasp generations would fall within food web compartments based on their host oaks and location on the tree as demonstrated in previous work. Counter to this hypothesis, parasitoids attacking one of the newest invaders (A. grossulariae) break down host tree-associated compartmentalisation. Where A. grossulariae has yet to become established, host-based compartmentalisation remains pronounced. Despite extensive sharing of parasitoid species, I found only one strong indirect interaction between species (both aliens) and no evidence for widespread apparent competition. Spatial density dependent predation on an appropriate scale can stabilise population dynamics. I quantified predation by blue tits (Parus caeruleus) of spring generation bud galls on Turkey oak (Q. cerris) at three spatial scales (shoots within branches, branches within trees, trees within sites). I found significant levels of bird predation, with most variation occurring between trees rather than between shoots within branches. Spatial density dependence was detected at sites in southern England, primarily at the level of trees within a site. Relationships at finer spatial scales were far more variable in magnitude and sign. My results suggest that blue tits forage primarily at the level of trees. This thesis presents comprehensive new data on the establishment and spread of 12 invading cynipid species and on their interactions with native communities. The results further understanding of both spatial and temporal aspects of natural enemy recruitment to invading species. In particular, it is clear that individual invading species can significantly modify trophic linkage between established food web compartments. Finally, my data emphasise the significant (but often unstudied) contribution of highly mobile vertebrate predators to otherwise closed ecological microcosms.

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Hedberg, Nils. "Sea cages, seaweeds and seascapes : Causes and consequences of spatial links between aquaculture and ecosystems." Doctoral thesis, Stockholms universitet, Institutionen för ekologi, miljö och botanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-141009.

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Aquaculture is of growing importance in the global seafood production. The environmental impact of aquaculture will largely depend on the type of environment in which the aquaculture system is placed. Sometimes, due to the abiotic or biotic conditions of the seascape, certain aquaculture systems tend to be placed within or near specific ecosystems, a phenomenon that in this thesis is referred to as aquaculture system - ecosystem links. The exposed ecosystems can be more or less sensitive to the system specific impacts. Some links are known to be widespread and especially hazardous for the subjected ecosystem such as the one between the shrimp aquaculture and the mangrove forest ecosystem. The aim of this thesis was to identify and investigate causes and consequences of other spatial links between aquaculture and ecosystems in the tropical seascape. Two different aquaculture system - ecosystem links were identified by using high resolution satellite maps and coastal habitat maps; the link between sea cage aquaculture and coral reefs, and the one between seaweed farms and seagrass beds. This was followed by interviews with the sea cage- and seaweed farmers to find the drivers behind the farm site selection. Many seaweed farmers actively choose to establish their farms on sea grass beds but sea cage farmers did not consider coral reefs when choosing location for their farms. The investigated environmental consequences of the spatial link between sea cage aquaculture and coral reefs were considerable both on the local coral reef structure, and coral associated bacterial community. Furthermore, coral reef associated fish are used as seedlings and feed on the farms, which likely alter the coral food web and lower the ecosystem resilience. Unregulated use of last resort antibiotics in both fish- and lobster farms were also found to be a wide spread practice within the sea cage aquaculture system, suggesting a high risk for development of antibiotic resistant bacteria. The effects of seaweed farms on seagrass beds were not studied in this thesis but have earlier been shown to be rather substantial within the borders of the farm but less so outside the farm. Further, a nomenclature is presented to facilitate the discussion about production system - ecosystem links, which may also be used to be able to incorporate the landscape level within eco-certifying schemes or environmental risk assessments. Finally - increased awareness of the mechanisms that link specific aquaculture to specific habitats, would improve management practices and increase sustainability of an important and still growing food producing sector - the marine aquaculture.

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript.

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Books on the topic "Spatial links"

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Spatial mechanisms: Analysis and synthesis. Boca Raton, Fla: CRC Press, 2001.

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Flapan, Erica, Allison Henrich, Aaron Kaestner, and Sam Nelson, eds. Knots, Links, Spatial Graphs, and Algebraic Invariants. Providence, Rhode Island: American Mathematical Society, 2017. http://dx.doi.org/10.1090/conm/689.

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Appleton, Simon. Regional or national poverty lines?: The case of Uganda in the 1990s. Helsinki: United Nations University, World Institute for Development Economics Research, 2003.

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Eberhardshtayner, Yozef, Sergey Leonovich, and Valentin Dorkin. Design models of structural building materials under multiaxial stress. ru: INFRA-M Academic Publishing LLC., 2020. http://dx.doi.org/10.12737/1082947.

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The monograph presents the results of experimental and theoretical studies of the behavior of wood and concrete of various structures under biaxial and triaxial compression. It contains a systematic classification of existing models for concrete that link three-axis nonlinear elastic stresses and deformations, as well as research and subsequent evaluation of some basic models from the point of view of their possible use in the framework of spatial load analysis using FEM. It is intended for scientific and engineering workers of research and design organizations.

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Whitworth, Adam, ed. Towards a Spatial Social Policy. Policy Press, 2019. http://dx.doi.org/10.1332/policypress/9781447337904.001.0001.

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The motivation of this edited collection is to shine a light on the fertile, multi-faceted yet largely unexplored links between the concepts, perspectives, knowledges and methodological approaches of human geography and their contributions for what remains a largely aspatial social policy discipline and set of applied policy practices. With contributions from leading experts across the geography-policy divide this edited collection offer a range of original cutting-edge perspectives on the neglected and misunderstood spatialities of social policy thinking and their implications for both its scholarship and applied practice.

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Cohen, Marlene R., and John H. R. Maunsell. Neuronal Mechanisms of Spatial Attention in Visual Cerebral Cortex. Edited by Anna C. (Kia) Nobre and Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.007.

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Attention is associated with improved performance on perceptual tasks and changes in the way that neurons in the visual system respond to sensory stimuli. While we now have a greater understanding of the way different behavioural and stimulus conditions modulate the responses of neurons in different cortical areas, it has proven difficult to identify the neuronal mechanisms responsible for these changes and establish a strong link between attention-related modulation of sensory responses and changes in perception. Recent conceptual and technological advances have enabled progress and hold promise for the future. This chapter focuses on newly established links between attention-related modulation of visual responses and bottom-up sensory processing, how attention relates to interactions between neurons, insights from simultaneous recordings from groups of cells, and how this knowledge might lead to greater understanding of the link between the effects of attention on sensory neurons and perception.

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Eimer, Martin. The Time Course of Spatial Attention. Edited by Anna C. (Kia) Nobre and Sabine Kastner. Oxford University Press, 2014. http://dx.doi.org/10.1093/oxfordhb/9780199675111.013.006.

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Event-related brain potential (ERP) measures have made important contributions to our understanding of the mechanisms of selective attention. This chapter provides a selective and non-technical review of some of these contributions. It will concentrate mainly on research that has studied spatially selective attentional processing in vision, although research on crossmodal links in spatial attention will also be discussed. The main purpose of this chapter is to illustrate how ERP methods have helped to provide answers to major theoretical questions that have shaped research on selective attention in the past 40 years.

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Europe, Council of. Links Between the Sustainable Development of Tourism and Regional/Spatial Planning: Proceedings, Palma de Majorca, May 1999. Council of Europe, 2002.

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Europe, Council of. Links Between the Sustainable Development of Tourism and Regional/Spatial Planning: Proceedings, Palma de Majorca, May 1999. Council of Europe, 2002.

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Europe, Council of. Links Between the Sustainable Development of Tourism and Regional/Spatial Planning: Proceedings, Palma de Majorca, May 1999. Council of Europe, 2002.

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Book chapters on the topic "Spatial links"

1

Allum, Nick, Roger Patulny, Sanna Read, and Patrick Sturgis. "Re-evaluating the Links Between Social Trust, Institutional Trust and Civic Association." In Spatial and Social Disparities, 199–215. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8750-8_13.

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Durante, Fabrizio, Enrico Foscolo, Piotr Jaworski, and Hao Wang. "Connectedness Measures of Spatial Contagion in the Banking and Insurance Sector." In Strengthening Links Between Data Analysis and Soft Computing, 217–24. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-10765-3_26.

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Kimura, Naoto, and Nobuyuki Iwatsuki. "Spatial Rolling Contact Pair Generating the Specified Relative Motion Between Links." In Lecture Notes in Electrical Engineering, 307–16. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2875-5_26.

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Lim, Kwan Hui, Jeffrey Chan, Christopher Leckie, and Shanika Karunasekera. "Detecting Location-Centric Communities Using Social-Spatial Links with Temporal Constraints." In Lecture Notes in Computer Science, 489–94. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16354-3_53.

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Kaminuma, Tsuguchika, Takako Igarashi, Tatsuya Nakano, and Johji Miwa. "A Computer System that Links Gene Expression to Spatial Organization of Caenorhabditis Elegans." In Information Processing in Cells and Tissues, 243–52. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5345-8_25.

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Glazunov, V. A., G. V. Rashoyan, A. K. Aleshin, K. A. Shalyukhin, and S. A. Skvortsov. "Structural Synthesis of Spatial l-Coordinate Mechanisms with Additional Links for Technological Robots." In Advances in Artificial Systems for Medicine and Education II, 683–91. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12082-5_62.

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Sholanov, Korganbay Sagnayevich. "Analytical Description of the Links of Spatial Mechanisms and Manipulators by Redundant Parameters Method." In Parallel Manipulators of Robots, 53–64. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-56073-7_4.

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Ette, Andreas, and Marcel Erlinghagen. "Structures of German Emigration and Remigration: Historical Developments and Demographic Patterns." In IMISCOE Research Series, 43–63. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67498-4_3.

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AbstractGermany today is one of the world’s most important countries of immigration but at the same time a country of emigration. During the last three decades, more than 3.3 million German citizens have left the country whereas 2.5 million have returned. Overall, 3.8 million Germans live outside Germany in another country of the OECD. The chapter analyses basic structures of German emigration and remigration. Germany’s development as a country of emigration includes major historical predecessors but also a more recent, slowly increasing level of international mobility of the German population. The geographical pattern of departure from Germany describes emigration as a heterogeneous phenomenon related to urban regions with higher shares of well-qualified people, but also close spatial links, at least with the neighbouring countries in the south and the west. In the long term, Europe has stabilised as the major destination region whereas the Americas, overall, have lost their attraction compared to earlier periods of emigration. Demographically, international mobility is a phenomenon of the younger population in particular and closely related to other transitions within the life course including changes in relationship status. The motives of migration illustrate the close link between economic, but also partnership and family-related reasons to help us understand Germany’s recent experiences with international mobility.

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Bajtlik, Stanislaw. "The Spatial Correlation of Ly-α Clouds." In QSO Absorption Lines, 337–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-540-49458-4_68.

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Batty, Michael. "Defining Urban Science." In Urban Informatics, 15–28. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8983-6_3.

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AbstractThis introductory chapter provides a brief overview of the theories and models that constitute what has come to be called urban science. Explaining and measuring the spatial structure of the city in terms of its form and function is one of the main goals of this science. It provides links between the way various theories about how the city is formed, in terms of its economy and social structure, and how these theories might be transformed into models that constitute the operational tools of urban informatics. First the idea of the city as a system is introduced, and then various models pertaining to the forces that determine what is located where in the city are presented. How these activities are linked to one another through flows and networks are then introduced. These models relate to formal models of spatial interaction, the distribution of the sizes of different cities, and the qualitative changes that take place as cities grow and evolve to different levels. Scaling is one of the major themes uniting these different elements grounding this science within the emerging field of complexity. We then illustrate how we might translate these ideas into operational models which are at the cutting edge of the new tools that are being developed in urban informatics, and which are elaborated in various chapters dealing with modeling and mobility throughout this book.

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Conference papers on the topic "Spatial links"

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Allen, B. "Spatial channel characterisation of FDD wireless links." In Second International Conference on 3G Mobile Communication Technologies (3G 2001). IEE, 2001. http://dx.doi.org/10.1049/cp:20010014.

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Yi, Lu, and Tatu Leinonen. "Solution of Topology Embryonic Graph and Topology Graph for Unified Planar-Spatial Mechanisms." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/dfm-48167.

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An analysis matrix approach for solving an isomeric topology embryonic graph and a digital group approach for solving an isomeric topology graph of a unified planar-spatial mechanism are presented and the relative theory is discussed. Firstly, all binary links are removed from each acceptable linkage system with different degrees of freedom, many analysis matrixes are constructed, and many topology embryonic graphs of the mechanism are derived. Secondly, from an acceptable multi-element link combination of planar or spatial mechanisms, a rule for determining the isomeric topology embryonic graphs and an unreasonable topology embryonic graph is obtained. Thirdly, by considering the degree of freedom of the mechanism and the configuration of a planar or spatial mechanism, the number of binary links is determined. Finally, all removed binary links are rearranged systematically back into an isomeric topology embryonic graph, and the acceptable topology graphs of the mechanism are derived by using a digital group approach. Some illustrations show that the two approaches are simple and effective tools and can be employed to synthesize both planar and spatial mechanisms.

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Dong, Yuhan, Xuelong Mi, and Yiqing Zhou. "Spatial channel model for underwater wireless optical communication links." In the 11th ACM International Conference. New York, New York, USA: ACM Press, 2016. http://dx.doi.org/10.1145/2999504.3001113.

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Tato, Anxo, and Carlos Mosquera. "Deep Learning Assisted Rate Adaptation in Spatial Modulation Links." In 2019 16th International Symposium on Wireless Communication Systems (ISWCS). IEEE, 2019. http://dx.doi.org/10.1109/iswcs.2019.8877161.

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Du, Sen, Shi Zhang, Shuang Jin, Jinguo Quan, and Yuhan Dong. "Spatial channel model for underwater wireless optical communication links." In International Conference on Optoelectronic and Microelectronic Technology and Application, edited by Jennifer Liu. SPIE, 2020. http://dx.doi.org/10.1117/12.2585523.

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Yu, Wenchao, Wei Cheng, Charu C. Aggarwal, Haifeng Chen, and Wei Wang. "Link Prediction with Spatial and Temporal Consistency in Dynamic Networks." In Twenty-Sixth International Joint Conference on Artificial Intelligence. California: International Joint Conferences on Artificial Intelligence Organization, 2017. http://dx.doi.org/10.24963/ijcai.2017/467.

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Dynamic networks are ubiquitous. Link prediction in dynamic networks has attracted tremendous research interests. Many models have been developed to predict links that may emerge in the immediate future from the past evolution of the networks. There are two key factors: 1) a node is more likely to form a link in the near future with another node within its close proximity, rather than with a random node; 2) a dynamic network usually evolves smoothly. Existing approaches seldom unify these two factors to strive for the spatial and temporal consistency in a dynamic network. To address this limitation, in this paper, we propose a link prediction model with spatial and temporal consistency (LIST), to predict links in a sequence of networks over time. LIST characterizes the network dynamics as a function of time, which integrates the spatial topology of network at each timestamp and the temporal network evolution. Comparing to existing approaches, LIST has two advantages: 1) LIST uses a generic model to express the network structure as a function of time, which makes it also suitable for a wide variety of temporal network analysis problems beyond the focus of this paper; 2) by retaining the spatial and temporal consistency, LIST yields better prediction performance. Extensive experiments on four real datasets demonstrate the effectiveness of the LIST model.

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Jawarneh, Isam Mashhour Al, Paolo Bellavista, Antonio Corradi, Luca Foschini, Rebecca Montanari, and Andrea Zanotti. "In-memory Spatial-Aware Framework for Processing Proximity-Alike Queries in Big Spatial Data." In 2018 IEEE 23rd International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD). IEEE, 2018. http://dx.doi.org/10.1109/camad.2018.8514950.

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Shieh, Win-Bin, and Ben-Shiou Chou. "Gravity Balancing of a Spatial Articulated Manipulator Based on a New Spring Mechanism." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47033.

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Based on the theory of conservation of potential energy, design of a gravity-balancing spatial articulated manipulator by the use of a proposed spring mechanism is presented. Since the gravitational potential energy of the mass system of a spatial articulated manipulator of n links depends only on the orientation of each link within the system, the entire manipulator can then be considered to be equivalent to an array of n degenerated ground-adjacent links in the aspect of the potential energy. Moreover, since the gravitational potential energy of a rotary link moving in a vertical plane is a trigonometric function and the Scotch york mechanism is also a well-known harmonic motion generator, a new spring mechanism composed of a Scotch york, a compression spring, and a gear pair is used to balance the gravitational potential energy of each degenerated link. With a built-in spring mechanism embedded on each joint of the articulated manipulator, the entire spatial articulated manipulator maintains can be in equilibrium at all configurations, which is verified by the simulation of the system modeled in a commercial software Pro-Engineer. The prototyping of a practical system will be implemented in the near future.

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Innocenti, Carlo. "Kinematic Clearance Sensitivity Analysis of Spatial Structures With Revolute Joints." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/dac-8679.

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Abstract The paper presents a new method to assess the influence of joint clearances in spatial structures that are composed of links connected by revolute joints. The method allows assessment of the amount by which joint clearances affect the rigid-body position of a generic link of the structure when an external load is exerted on the link. Unlike other procedures, the proposed method relies on the clearance-free idealization of the structure under investigation. An example shows application of the proposed method to the analysis of the structure derived from a multi-loop manipulator by freezing its actuators.

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Odeh, Maha, Nizar Zorba, Charalambos Skianis, and Christos Verikoukis. "QoS performance in spatial cognitive systems." In 2010 IEEE 15th International Workshop on Computer Aided Modeling and Design of Communication Links and Networks (CAMAD). IEEE, 2010. http://dx.doi.org/10.1109/camad.2010.5686974.

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Reports on the topic "Spatial links"

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Marchais, Gauthier, Marchais, Gauthier, Sweta Gupta, Cyril Owen Brandt, Patricia Justino, Marinella Leone, Eustache Kuliumbwa, Olga Kithumbu, Issa Kiemtoré, Polepole Bazuzi Christian, and Margherita Bove. Marginalisation from Education in Conflict-Affected Contexts: Learning from Tanganyika and Ituri in the DR Congo. Institute of Development Studies (IDS), January 2021. http://dx.doi.org/10.19088/ids.2021.017.

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This Working Paper analyses how violent conflict can enhance or reduce pre-existing forms of marginalisation and second, how new forms of marginalisation emerge as a result of violent conflict. To do so, we focus on the province of Tanganyika in the DRC, where the so-called ‘Twa-Bantu’ violent conflict has been disrupting the education sector since 2012, and secondarily on the province of Ituri, which has been affected by repeated armed conflicts since the 1990s. We use a mixed methods approach, combining quantitative data collection methods and several months of qualitative fieldwork. The study shows that the political marginalisation of ethno-territorial groups is key in understanding marginalisation from education in contexts of protracted conflict. Our results show that the Twa minority of Tanganyika has not only been more exposed to violence during the Twa-Bantu conflict, but also that exposure to violence has more severe effects on the Twa in terms of educational outcomes. We analyse key mechanisms, in particular spatial segregation, and the social segregation of schools along ethnic/identity lines. We also analyse the interaction between ethno-cultural marginalisation and economic, social and gender-related marginalisation.

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Marchais, Gauthier, Sweta Gupta, Cyril Owen Brandt, Patricia Justino, Marinella Leone, Eustache Kuliumbwa, Olga Kithumbu, Issa Kiemtoré, Polepole Bazuzi Christian, and Margherita Bove. Marginalisation from Education in Conflict-Affected Contexts: Learning from Tanganyika and Ituri in the DR Congo. Institute of Development Studies (IDS), January 2021. http://dx.doi.org/10.19088/ids.2021.048.

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This Working Paper analyses how violent conflict can enhance or reduce pre-existing forms of marginalisation and second, how new forms of marginalisation emerge as a result of violent conflict. To do so, we focus on the province of Tanganyika in the DRC, where the so-called ‘Twa-Bantu’ violent conflict has been disrupting the education sector since 2012, and secondarily on the province of Ituri, which has been affected by repeated armed conflicts since the 1990s. We use a mixed methods approach, combining quantitative data collection methods and several months of qualitative fieldwork. The study shows that the political marginalisation of ethno-territorial groups is key in understanding marginalisation from education in contexts of protracted conflict. Our results show that the Twa minority of Tanganyika has not only been more exposed to violence during the Twa-Bantu conflict, but also that exposure to violence has more severe effects on the Twa in terms of educational outcomes. We analyse key mechanisms, in particular spatial segregation, and the social segregation of schools along ethnic/identity lines. We also analyse the interaction between ethno-cultural marginalisation and economic, social and gender-related marginalisation.

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