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Virtual Knowledge Graphs:An Overview of Systems and Use Cases

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维普期刊数据库

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Data Intelligence 2019年第3期1卷 201-223页

作者： Guohui Xiao Linfang Ding Benjamin Cogrel diego Calvanese KRDB Research Centre for Knowledge and Data Free University of Bozen-BolzanoBolzano 39100Italy Chair of Cartography Technical University of MunichMunich 80333Germany

In this paper,we present the virtual knowledge graph(VKG)paradigm for data integration and access,also known in the literature as Ontology-based Data *** of structuring the integration layer as a collection of relational tables,the VKG paradigm replaces the rigid structure of tables with the flexibility of graphs that are kept virtual and embed domain *** explain the main notions of this paradigm,its tooling ecosystem and significant use cases in a wide range of ***,we discuss future research directions.

关键词： Virtual knowledge graph Ontology-based data access Data integration Data virtualization

Hormonal control of seasonal color change in female spiny-footed lizards:an observational and experimental approach

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Current Zoology 2019年第6期65卷 633-642页

作者： Belen FRESNILLO Josabel BELLIURE diego GIL Jose J.CUERVO Department of Life Sciences Ecology SectionUniversity of AlcalaMadridSpain Department of Functional and Evolutionary Ecology Estacion Experimental de Zonas Aridas(CSIC)Carretera de Sacramento s/nAlmerfaSpain Department of Evolutionary Ecology Museo Nacional de Ciencias Naturales(CSIC)MadridSpain

Breeding coloration of females often signals aspects of their reproductive status,suggesting a link between color and sex steroid *** this study,we examined the relationships between 2 sex steroid hormones(progesterone and p-estradiol)and reproductive coloration in female spinyfooted lizards Acanthodactylus *** first explored natural variation in female plasma hormone levels and coloration during their reproductive cycle,p-estradiol was negatively related to brightness and positively related to red saturation,whereas progesterone was not significantly related to *** identifying key relationships,plasma hormone concentrations were manipulated by creating 3 experimental female groups(p-estradiol-treated,progesterone-treated,and control),and the effects on coloration were monitored,p-estradiol-treated females,in which there was a rise in both p-estradiol and progesterone levels,lost their red coloration earlier than females in the other 2 experimental groups,whereas progesterone treatment had no significant effect on female *** results suggest that high levels of either p-estradiol alone or(3-estradiol together with progesterone trigger the loss of red coloration in female spiny-footed lizards,and that progesterone alone does not affect *** hypothesize that changes in female breeding color might be regulated by(3-estradiol in species in which conspicuous coloration is displayed before ovulation,and by progesterone in species in which this color is displayed during gravidity.

关键词： color signaling enzyme immunoassay hormone-induced color change sex-specific coloration spectrophotometry transdermal hormone application

Association of sleep quality with sociodemographic factors and lifestyle in adolescents from southern Brazil

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World Journal of Pediatrics 2018年第4期14卷 383-391页

作者： Tiago Rodrigues de Lima diego Augusto Santos Silva Physical Education Department Federal University of Santa CatarinaProfessor Clementino de Britto Street362 ap 334 CapoeirasFlorianópolisSanta CatarinaBrazil

Background Good sleep quality is an essential component for growth, development, and physical and mental health of the individual, in addition to being a positive indicator of health and well-being. The objective of this study was to estimate the prevalence of poor sleep quality and to identify the association of poor sleep quality with sociodemographic factors, lifestyle, weight status, and associated aerobic fitness in adolescents. Methods This study included 1110 students aged 14–19 years from city of S?o José/SC, Brazil. Sleep quality of the subjects was assessed using a questionnaire and classified as adequate and low. Independent variables were gender, age, monthly household income, maternal education, school shift, global physical activity, proper diet, screen time, sleeping hours of full week, sleeping hours of weekdays, sleeping hours of weekends, weight status, and aerobic fitness. Binary logistic regression was used to estimate odds ratios and confidence intervals of 95%. Results Prevalence of poor sleep quality was 60.4%. More likely to have poor sleep quality were identified in female students (OR 1.68, 95% CI 1.11–2.55), whose mothers had higher levels of education (OR 1.44, 95% CI 1.20–1.73) and low aerobic fitness (OR 1.80, 95% CI 1.02–3.19). Conclusion Adolescents who were most likely to report poor sleep quality were female, those whose mothers had a higher educational level and had low aerobic fitness. Students with sedentary risk behavior were less likely of reporting poor sleep quality.

关键词： Adolescents Brazil Cross-sectional studies Demographic indicators Sleep hygiene

Spinal cord injury-induced cognitive impairment: a narrative review

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Neural Regeneration Research 2022年第12期17卷 2649-2654页

作者： Oscar V.Alcántar-Garibay diego Incontri-Abraham Antonio Ibarra Centro de Investigación en Ciencias de la Salud(CICSA) Facultad de Ciencias de la SaludUniversidad Anáhuac México Campus NorteHuixquilucanEstado de MéxicoMéxico

Spinal cord injury is a serious damage to the spinal cord that can lead to life-long *** on its etiology,spinal cord injury can be classified as traumatic or non-traumatic spinal cord ***,the pathology of spinal cord injury can be divided into two phases,a primary injury phase,and a secondary injury *** primary spinal cord injury phase involves the initial mechanical injury in which the physical force of impact is directly imparted to the spinal cord,disrupting blood vessels,axons,and neural cell *** the primary injury,a cascade of secondary events begins,expanding the zone of neural tissue damage,and exacerbating neurological *** injury is a progressive condition characterized by pro-inflammatory cytokines,reactive oxygen species,oxidative damage,excitatory amino acids such as glutamate,loss of ionic homeostasis,mitochondrial dysfunction,and cell *** secondary phase lasts for several weeks or months and can be further subdivided into acute,subacute,and *** of the most frequent and devastating complications developed among the spinal cord injury population is cognitive *** risk of cognitive decline after spinal cord injury has been reported to be 13 times higher than in healthy *** exact etiology of this neurological complication remains unclear,however,many factors have been proposed as potential contributors to the development of this disorder,such as concomitant traumatic brain injury,hypoxia,anoxia,autonomic dysfunction,sleep disorders such as obstructive sleep apnea,body temperature dysregulation,alcohol abuse,and certain *** review focuses on a deep understanding of the pathophysiology of spinal cord injury and its relationship to cognitive *** highlight the main mechanisms that lead to the development of this neurological complication in patients with spinal cord injury.

关键词： autonomic dysfunction cognitive impairment spinal cord injury traumatic brain injury

Description of a Propulsion Unit Used in Guiding a Walking Machine by Recognizing a Three-point Bordered Path

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Chinese Journal of Mechanical Engineering 2016年第6期29卷 1157-1166页

作者： NUNEZ-ALTAMIRANO diego A JUAREZ-CAMPOS Ignacio MARQUEZ-PEREZ Lucia FLORES-DIAZ Ociel School of Mechanical Engineering Universidad Michoacana de San Nicolas de Hidalgo Morelia Michoacan Mexico

A reconfigurable propulsion unit based on the Peaucellier-Lipkin mechanism has the ability to describe exact straight or curved paths depending on the selected ratio between the lengths of two of its links. The Peaucellier-Lipkin mechanism with one degree of freedom is transformed into a more sophisticated parallel kinematic chain by including four more degrees of freedom. The resulting propulsion unit is able to adapt its kinematic structure and reach instant centers of rotation, in accordance with the presence of three points that border a geometric path. A laser sensor mounted on the body of the machine detects each point. Once the machine has detected the exact location of the border of the road, it walks along a curve parallel to that border. Although the proposed research describes only one propulsion unit or leg, the methodology can be applied to all the legs of the walking machine. The novel 5-DOF leg is able to reach different centers of rotation, providing either the concave or convex arcs that satisfy the basic principle of displacement of walking machines.

关键词： Propulsion unit Peaucellier-Lipkin walking machine straight line mechanism.

Integrated operational planning of hydrothermal power and natural gas systems with large scale storages

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Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 299-313页

作者： diego Mauricio OJEDA-ESTEYBAR Ricardo German RUBIO-BARROS Alberto VARGAS Instituto de Energı´a Ele´ctrica(IEE) Universidad Nacional de San Juan(UNSJ)Consejo Nacional de Investigaciones Cientı´ficas y Tecnolo´gicas(CONICET)Av.Libertador Gral.San Martı´n West 11095400 San JuanArgentina

The growing installation of natural gas fired power plants has increased the integration of natural gas and electricity sectors. This has driven the need investigate the interactions among them and to optimize energy resources management from a centralized planning perspective. Thus, a combined modeling of the reservoirs involved in electric power and gas systems and their locations on both networks are essential features to be considered in the operational planning of energy *** paper presents a modeling and optimization approach to the operational planning of electric power and natural gas systems, taking into account different energy storage facilities, such as water reservoirs, natural gas storages and line packs of pipelines. The proposed model takes advantage of captures both energy systems synergy and their associated networks. This approach identifies the interactions between the energy storage facilities and their economic impact over their optimal scheduling. The results show the benefits of an integrated operational planning of electric power and natural gas systems, the close interdependency between the energy resources stored in both systems, and the effects of a combined scheduling.

关键词： Energy storage Hydrothermal scheduling Integrated operational planning Integrated energy systems Natural gas

Extra food provisioning does not affect behavioral lateralization in nestling lesser kestrels

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Current Zoology 2023年第1期69卷 66-75页

作者： Camilla Soravia Angelo Bisazza Jacopo G.Cecere diego Rubolini Centre for Evolutionary Biology(M092) University of Western Australia35 Stirling HighwayPerthWA 6009Australia Department of General Psychology University of Padovavia Venezia 8Padova I-35131Italy Padova Neuroscience Center University of PadovaVia Orus 2/BPadova I-35129Italy ISPRA—The Italian Institute for Environmental Protection and Research via CàFornacetta 9Ozzano dell’EmiliaBologna I-40064Italy Dipartimento di Scienze e Politiche Ambientali Universitàdegli Studi di Milanovia Celoria 26MilanoI-20133Italy Istituto di Ricerca Sulle Acque IRSA-CNRVia del Mulino 19Brugherio I-20861Italy

Costs and benefits of brain lateralization may depend on environmental *** evidence indicates that the development of brain functional asymmetries is adaptively shaped by the environmental conditions experienced during early *** availability early in life could act as a proxy of the environmental conditions encountered during adulthood,but its potential modulatory effect on lateralization has received little *** increased food supply from egg laying to early nestling rearing in a wild population of lesser kestrels Falco naumanni,a sexually dimorphic raptor,and quantified the lateralization of preening behavior(head turning direction).As more lateralized individuals may perform better in highly competitive contexts,we expected that extra food provisioning,by reducing the level of intra-brood competition for food,would reduce the strength of *** found that extra food provisioning improved nestling growth,but it did not significantly affect the strength or direction of nestling *** addition,maternal body condition did not explain variation in nestling *** of extra food provisioning,the direction of lateralization differed between the sexes,with female nestlings turning more often toward their *** findings indicate that early food availability does not modulate behavioral lateralization in a motor task,suggesting limited phenotypic plasticity in this trait.

关键词： development laterality preening raptor sex-differences

Deep Learning and Time Series-to-Image Encoding for Financial Forecasting

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IEEE/CAA Journal of Automatica Sinica 2020年第3期7卷 683-692页

作者： Silvio Barra Salvatore Mario Carta Andrea Corriga Alessandro Sebastian Podda diego Reforgiato Recupero Department of Mathematics and Computer Science University of CagliariCagliari 09121Italy

In the last decade,market financial forecasting has attracted high interests amongst the researchers in pattern ***,the data used for analysing the market,and then gamble on its future trend,are provided as time series;this aspect,along with the high fluctuation of this kind of data,cuts out the use of very efficient classification tools,very popular in the state of the art,like the well known convolutional neural networks(CNNs)models such as Inception,Res Net,Alex Net,and so *** forces the researchers to train new tools from *** operations could be very time *** paper exploits an ensemble of CNNs,trained over Gramian angular fields(GAF)images,generated from time series related to the Standard&Poor's 500 index future;the aim is the prediction of the future trend of the ***.A multi-resolution imaging approach is used to feed each CNN,enabling the analysis of different time intervals for a single observation.A simple trading system based on the ensemble forecaster is used to evaluate the quality of the proposed *** method outperforms the buyand-hold(B&H)strategy in a time frame where the latter provides excellent *** quantitative and qualitative results are provided.

关键词： Convolutional neural networks(CNNs) ensemble of CNNs financial forecasting Gramian angular fields(GAF)imaging

Guest Editorial for Special Issue on Time Series Classification

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IEEE/CAA Journal of Automatica Sinica 2019年第6期6卷 1291-1292页

作者： Houshang Darabi Georgiana Ifrim Patrick Schafer diego Furtado Silva Department of Mechanical and Industrial Engineering University of Illinois at Chicago(UIC) University of Bucharest Romania University of Berlin Sciences(ICMC) University of Sao Paulo

TIME series classification research and applications have recently received a lot of *** the rapid advancement of technological devices,time series data are being collected by a wide variety of devices,resulting in a wide range of research and *** fields of studies,ranging from healthcare to weather readings,require time series *** and action recognition using time series data from fitness trackers are commonly being ***,a new generation of algorithms and techniques are being used to classify time series data that are extensively available to the research *** example,recently deep learning techniques that utilize convolutions and recurrent neural networks are being used to classify epileptic seizures from EEG recordings made available at the University of California-Irvine data repository.

关键词： classify utilize recording