668 research outputs found

    THE RECENT SEISMICITY AT THE ALP-DINARIDES JUNCTION

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    2005/2006The aim of this Phd thesis is to get an insight on recent active seismic events occurring in the area of the Alps-Dinarides junction. This area is tectonically active in the greater scenario of the collision between the Eurasian plate and the African one, particularly the Adria microplate. In this study we have adapted the reflectivity method package developed for applied geophysics purpose to obtain synthetic seismograms related to earthquake signals, in particular for what it concerns the extended source modelling, and we have applied it to study the Friuli area events. In particular, to validate the method, we have performed both the direct modelling of the 2002 Carnia event, obtaining for it a 2km x 2km fault area, and calculated a scenario for the Friuli 1976 event, which turns to be compatible in its pattern with the observed macroseismic intensity felt. In the second part we have performed a JHD relocation for the 2004 Bovec sequence, comparing the aftershock relocations with those related to the 1998 sequence. We have observed that the 1998 rupture continued towards NW during the 2004 event. This is in agreement with the post event Coulomb's stress distribution, obtained by modelling the 1998 Bovec event. From the Coulomb stress modelling we recognize also a general increase of stress to the West and to the East of Bovec epicentral area. At last we have performed a waveform source parameter inversion for four events in the Friuli area and eleven events in the Western Slovenia area (magnitude mainly M>3.5), finding fault plane solutions in agreement with both the North-South directed stress field and the geometry of faults in each of the areas

    Deep Semi-Supervised Anomaly Detection for Finding Fraud in the Futures Market

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    Modern financial electronic exchanges are an exciting and fast-paced marketplace where billions of dollars change hands every day. They are also rife with manipulation and fraud. Detecting such activity is a major undertaking, which has historically been a job reserved exclusively for humans. Recently, more research and resources have been focused on automating these processes via machine learning and artificial intelligence. Fraud detection is overwhelmingly associated with the greater field of anomaly detection, which is usually performed via unsupervised learning techniques because of the lack of labeled data needed for supervised learning. However, a small quantity of labeled data does often exist. This research article aims to evaluate the efficacy of a deep semi-supervised anomaly detection technique, called Deep SAD, for detecting fraud in high-frequency financial data. We use exclusive proprietary limit order book data from the TMX exchange in Montr\'eal, with a small set of true labeled instances of fraud, to evaluate Deep SAD against its unsupervised predecessor. We show that incorporating a small amount of labeled data into an unsupervised anomaly detection framework can greatly improve its accuracy.Comment: 8 pages, 3 figure

    Relationships Between Externalization Behaviors and Team Cognition Variables in Distributed Teams

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    Members of distributed teams often have difficulty sharing unique information with their teammates during decision making tasks. These communication problems may hinder the development of cognitions that allow team members to reach a similar understanding of the content and structure of task information. The C-MAP intervention (Rentsch, Delise, & Hutchison, 2008) was designed to assist team members in sharing their information through behaviors that convey the content and structure of information by using specific communication behaviors and developing a knowledge object. In the present study, the knowledge object took the form of a white board where information was posted and organized. The development of the team knowledge object was the focus of the study. Using the knowledge object, team members could post a piece of unique information, highlight it, and organize it into clusters, thereby illustrating the content and structure of information through knowledge object development (KOD) behaviors. The present study evaluated the relationships among four types of KOD behaviors (posting content, highlighting content, conveying structure within domain, and conveying structure across domains) used to externalize pieces of unique information and two team cognition variables (transferred and interoperable knowledge) that develop with respect to each piece of unique information. Results provided evidence that posting content behaviors and highlighting content behaviors were positively related to transferred knowledge. Results also indicated that conveying structure within domain behaviors were negatively related to interoperable knowledge. However, conveying structure across domains behaviors were positively related to interoperable knowledge. Implications of these findings for the C-MAP intervention and suggestions for future research are presented

    Me, Myself, & Identity Online: Identity Salience on Facebook vs Non-Virtual Identity

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    Many Social Networking Sites have come and gone over the past decade, but Facebook continues to grow in popularity. Facebook is designed to connect people to one another through virtual networks of “friends” where members participate in the presentation of self virtually- through profile creation, maintenance, and exchanges of content. Social Networking Sites create a location for identity formation and projection that is similar, yet distinct, from face-to-face interactions. Facebook offers a unique avenue for people to control their presentation of self, while maintaining reflexive features. This study this study explores the notion of a particular “Facebook role” while specifically addressing front stage projections in relation to backstage information and the resulting differences in identity. In effect, people are “themselves” on Facebook, just a consistently “good” version of themselves

    ALCUNI DOCUMENTI SULLA PESCA DELL’ISOLA DI LESINA SOTTO IL GOVERNO AUSTRO-UNGARICO E DURANTE L’AMMINISTRAZIONE ITALIANA

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    L’Autore in questo saggio porta alla luce dei documenti inediti sulla pesca dell’isola di Lesina, frutto di una ricerca presso l’Archivio di Stato di Trieste, che interessano gli anni 1903, 1911-1913 e 1918 per quanto riguarda il periodo di Governo austro-ungarico e gli anni 1919-1921 per la breve Amministrazione italiana.U ovom eseju autor predstavlja pojedine neobjavljene dokumente o ribarstvu na otoku Hvaru, koji su plod istraživanja provedenog u Državnom arhivu u Trstu, a čuvaju se u fondu Governo marittimo in Trieste (Pomorski gubernij u Trstu). Odnose se na godine 1903., 1911.-1913. i 1918. za vrijeme Austro-ugarske vladavine nad otokom te na godine 1919.-1921. kratkog razdoblja talijanske uprave. To su svjedočanstva o lokalnim Komisijama za ribarstvo, o zakonima i količinama slane ribe za izvoz u Italiju i o potrebnim ispravama radi dobivanja nadoknade u slučaju krađe mreža. U drugim su dokumentima iskazane količine ulova cijelog otoka za mjesec kolovoz 1918. Za vrijeme talijanske uprave donose se šestomješečni „inventari“ za godine 1919. i 1920. o broju i vrijednosti ribarskih brodova, mreža, alata te o broju ribara. Za razdoblje 1920.-1921. pronađene su razne mjesečne izjave o ulovu na pojedinim otočkim lokalitetima, zatim prijedlozi o ljetnom ribarstvu i procedure za dodjelu ribolovnih pošta. Na kraju eseja donosi se protest dvadeset jelšanskih ribara protiv određenog načina ribarenja u njihovom ribnjaku te problemi nastali uslijed Rapalskog ugovora (12. studeni 1920.)

    Situating Street Kids: An Ethnography of Nomadic Street Kids in Portland, Oregon

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    Homelessness in the United States has been widely researched in the social sciences. Only within the last 20 years have ethnographic studies focused on street kids, a youth subculture. Some of this work has emphasized the transience of street kid lifeways and problematized the street kid lifestyle, an approach that has rendered street kids as victims. More recently, social scientists have refocused their analytic lens on the ways that street kids are agents of their own actions and understood only within the context of past events that shaped decisions to live on the street. This thesis aligns with the latter body of research and focuses specifically on street kid subculture in Portland, Oregon. I argue that a nomadic lifestyle is the cornerstone of street kid ethos and a meaningful site for framing a general disenchantment with mainstream American culture. Despite this disenchantment, I argue that street kid lifeways are better regarded as a subculture rather than a counterculture. To this end, I explore the ways that street kid identity is shaped by facets of their nomadic and communal lifestyle, dependent on the American mainstream, and ultimately impermanent. All data was collected during summer 2012 in Portland, Oregon through participant observation and interviews

    ALCUNI DOCUMENTI SULLA PESCA DELL’ISOLA DI LESINA SOTTO IL GOVERNO AUSTRO-UNGARICO E DURANTE L’AMMINISTRAZIONE ITALIANA

    Get PDF
    L’Autore in questo saggio porta alla luce dei documenti inediti sulla pesca dell’isola di Lesina, frutto di una ricerca presso l’Archivio di Stato di Trieste, che interessano gli anni 1903, 1911-1913 e 1918 per quanto riguarda il periodo di Governo austro-ungarico e gli anni 1919-1921 per la breve Amministrazione italiana.U ovom eseju autor predstavlja pojedine neobjavljene dokumente o ribarstvu na otoku Hvaru, koji su plod istraživanja provedenog u Državnom arhivu u Trstu, a čuvaju se u fondu Governo marittimo in Trieste (Pomorski gubernij u Trstu). Odnose se na godine 1903., 1911.-1913. i 1918. za vrijeme Austro-ugarske vladavine nad otokom te na godine 1919.-1921. kratkog razdoblja talijanske uprave. To su svjedočanstva o lokalnim Komisijama za ribarstvo, o zakonima i količinama slane ribe za izvoz u Italiju i o potrebnim ispravama radi dobivanja nadoknade u slučaju krađe mreža. U drugim su dokumentima iskazane količine ulova cijelog otoka za mjesec kolovoz 1918. Za vrijeme talijanske uprave donose se šestomješečni „inventari“ za godine 1919. i 1920. o broju i vrijednosti ribarskih brodova, mreža, alata te o broju ribara. Za razdoblje 1920.-1921. pronađene su razne mjesečne izjave o ulovu na pojedinim otočkim lokalitetima, zatim prijedlozi o ljetnom ribarstvu i procedure za dodjelu ribolovnih pošta. Na kraju eseja donosi se protest dvadeset jelšanskih ribara protiv određenog načina ribarenja u njihovom ribnjaku te problemi nastali uslijed Rapalskog ugovora (12. studeni 1920.)
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