Search results for "feature"

Classification in point patterns on linear networks under clutter

2022

The problem of features detection under present of clutter in point process on linear networks establishes a methodological and computational challenge with multiple kind of applications as traffic accidents among other. Previous works related to the same topical but developed in more simpler geometries tackles the issue of the clutter removal through the distance of nearest-neighbour and show good results with high classification rates. We extend this procedure to the linear networks motivated by the classification of the traffic accidents on the road network of a city. Simulations demonstrate the performance of the method.

Aprendizaje de similitudes entre pares de objetos mediante clasificación supervisada

2017

El uso de medidas de similitud, distancias o métricas se encuentra en la base del funcionamiento de numerosas técnicas estándar de clasificación, resultando además, una tarea fundamental e importante en las áreas de estudio del Aprendizaje Automático (Machine Learning) y el Reconocimiento de Patrones (Pattern Recognition). Dado que el cálculo de la similitud entre dos objetos puede ser muy diferente en función del contexto, la construcción inteligente de estas medidas a partir de los datos disponibles, puede ayudar en la obtención de clasificadores más robustos y mejorar los resultados en la tarea específica que se propone resolver. En los últimos años, el aprendizaje de métricas (Metric Le…

Anthropogenic Influences in Land Use/Land Cover Changes in Mediterranean Forest Landscapes in Sicily

2016

This paper analyzes and quantifies the land use/land cover changes of the main forest and semi-natural landscape types in Sicily between 1955 and 2012. We analyzed seven representative forest and shrubland landscapes in Sicily. These study areas were chosen for their importance in the Sicilian forest panorama. We carried out a diachronic survey on historical and current aerial photos; all the aerial images used to survey the land use/land cover changes were digitalized and georeferenced in the UTM WGS84 system. In order to classify land use, the Regional Forest Inventory 2010 legend was adopted for the more recent images, and the CORINE Land Cover III level used for the older, lower resolut…

Long-term decrease in Asian monsoon rainfall and abrupt climate change events over the past 6,700 years

2021

Significance The variability of the Asian summer monsoon (ASM) is important for the functioning of ecological and societal systems at regional to continental scales, but the long-term evolution and interannual variability of this system is not well understood. Here, we present a stable isotope–based reconstruction of ASM variability covering 4680 BCE to 2011 CE. Superimposed on a gradual drying trend, a rapid drop in mean annual precipitation (>40%) toward persistently drier conditions occurred in ∼1675 BCE. This megadrought caused regional forest deterioration and enhanced aeolian activity affecting Chinese ecosystems. We argue that this abrupt aridification starting ∼2000 BCE triggered wa…

Lietišķo e-pastu reģistra analīze

2016

Mūsdienās elektroniskais pasts ir kļuvis par plaši izmantotu komunikācijas līdzekli uzņēmumos. Pētījuma mērķis bija noteikt lietišķo e-pastu reģistra izplatītākās iezīmes Latvijas azartspēļu uzņēmuma iekšējā un ārējā komunikācijā. Pētījumā tika izmantots Baibera un Konrāda (2009) reģistra analīzes modelis individuālajam e-pastam. Pētījuma rezultāti parādīja, ka lietišķajiem e-pastiem ir gan mutvārdu, gan rakstiskās diskursa īpašības. Lietišķo e-pastu izplatītākās iezīmes ir patstāvīgie darbības vārdi, lietvārdi, modālie darbības vārdi, personu vietniekvārdi, nozarē lietoti žargonismi un saīsinājumi. To lietojumu ietekmē situācijas konteksts , un to var sekmīgi pētīt, izmantojot Baibera un K…

Congenital double lip associated to hemangiomas: Report of a case

2004

Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:21:03Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:33:45Z : No. of bitstreams: 1 2-s2.0-3543121270.pdf: 61328 bytes, checksum: 7b80f6694b9e57340f5311bb4101c338 (MD5) Made available in DSpace on 2014-05-27T11:21:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-03-01 Double lip is a developmental abnormality which may occur either isolated or as a component of Ascher's syndrome. A case of congenital double lip associated to hemangiomas and enlargement of the thyroid is reported. The oral and facial hemangiomas were excised under local anesthesia. Surgical reconstruction of the upper li…

Digital content marketing in B2B contexts: The drivers of engagement and electronic word of mouth communication at international trade shows

2023

El potencial que representan las redes sociales como una herramienta de marketing es indiscutible, permiten compartir información, construir redes, e influir en consumidores y marcas. Aún más, las redes sociales contribuyen al engagement empresa a empresa (B2B por sus siglas en inglés), ofreciendo un entorno perfecto para su desarrollo. En este sentido, la literatura en marketing ha reconocido la utilidad de las redes sociales en la promoción de ferias comerciales internacionales (ITS por sus siglas en inglés) empresa a empresa. Adicionalmente, en tiempos de crisis como lo es el COVID-19, la comunicación es uno de los principales desafíos en la gestión de emergencias, y las redes sociales s…

Species–area relationships in continuous vegetation: Evidence from Palaearctic grasslands

2019

Aim Species-area relationships (SARs) are fundamental scaling laws in ecology although their shape is still disputed. At larger areas, power laws best represent SARs. Yet, it remains unclear whether SARs follow other shapes at finer spatial grains in continuous vegetation. We asked which function describes SARs best at small grains and explored how sampling methodology or the environment influence SAR shape. Location Palaearctic grasslands and other non-forested habitats. Taxa Vascular plants, bryophytes and lichens. Methods We used the GrassPlot database, containing standardized vegetation-plot data from vascular plants, bryophytes and lichens spanning a wide range of grassland types throu…

Próba wyznaczenia zakresu pojęcia danych biometrycznych

2016

Monitoring Water and Energy Cycles at Climate Scale in the Third Pole Environment (CLIMATE-TPE)

2021

A better understanding of the water and energy cycles at climate scale in the Third Pole Environment is essential for assessing and understanding the causes of changes in the cryosphere and hydrosphere in relation to changes of plateau atmosphere in the Asian monsoon system and for predicting the possible changes in water resources in South and East Asia. This paper reports the following results: (1) A platform of in situ observation stations is briefly described for quantifying the interactions in hydrosphere-pedosphere-atmosphere-cryosphere-biosphere over the Tibetan Plateau. (2) A multiyear in situ L-Band microwave radiometry of land surface processes is used to develop a new microwave r…