Supporto ad Applicazioni di Web Reputation basate su Piattaforma Apache Storm

Parametro indispensabile di valutazione di un qualsiasi prodotto o servizio, ai giorni nostri, è la web reputation. Sono sempre più numerose le aziende che monitorano la propria "reputazione online". Quest'ultima può esser definita come l'insieme dei messaggi, commenti e feedbacks, positivi, neutri o negativi che siano, di utenti che esprimono la loro opinione tramite il web su un determinato servizio o prodotto rivolto al pubblico. L’applicazione sviluppata, si pone l’obiettivo di analizzare in tempo reale tramite l’utilizzo di Apache Storm, dati provenienti da fonti eterogenee, classificarli tramite KNIME utilizzando tecniche di classificazione quali SVM, alberi decisionali e Naive Bayesian, renderli persistenti mediante l’utilizzo del database NoSQL HBASE e di visualizzarli in tempo reale attraverso dei grafici utilizzando delle servlet, al fine di costituire un valido strumento di supporto per i processi decisionali.

Trust and Reputation in Internet Auctions

Exchange between anonymous actors in Internet auctions corresponds to a one-shot prisoner's dilemma-like situation. Therefore, in any given auction the risk is high that seller and buyer will cheat and, as a consequence, that the market will collapse. However, mutual cooperation can be attained by the simple and very efficient institution of a public rating system. By this system, sellers have incentives to invest in reputation in order to enhance future chances of business. Using data from about 200 auctions of mobile phones we empirically explore the effects of the reputation system. In general, the analysis of nonobtrusive data from auctions may help to gain a deeper understanding of basic social processes of exchange, reputation, trust, and cooperation, and of the impact of institutions on the efficiency of markets. In this study we report empirical estimates of effects of reputation on characteristics of transactions such as the probability of a successful deal, the mode of payment, and the selling price (highest bid). In particular, we try to answer the question whether sellers receive a "premium" for reputation. Our results show that buyers are willing to pay higher prices for reputation in order to diminish the risk of exploitation. On the other hand, sellers protect themselves from cheating buyers by the choice of an appropriate payment mode. Therefore, despite the risk of mutual opportunistic behavior, simple institutional settings lead to cooperation, relatively rare events of fraud, and efficient markets.

Reliability of the AASHTO temperature shift in material toughness testing /

Includes bibliographical references.

Le bill seigneurial, exposé sous son vrai jour par le journal "La Patrie" : reputation victorieuse du rapport soumis a la convention anti-seigneuriale.

Mode of access: Internet.

The reputation of George Saxon : and other stories.

The reputation of George Saxon.--The artist.--The bronze caster.--Exlex.--A noble German.--The troubles of Johann Eckert.--The plot of his story.--On Bear Creek.--The captain's wife.--Sam Jackson's snake.--Francke and party.

The reputation of the metaphysical poets during the age of Johnson and the romantic revival /

Cover title

Fracture toughness of Portland cement concretes /

Mode of access: Internet.

The history of George a Green, pindar of the town of Wakefield. His birth, calling, valour, and reputation in the country. With divers pleasant, as well as serious passages in the course of his life and fortune.

Published under numerous variations of the title.

The law of unfair business competition, including chapters on trade secrets and confidential business relations; unfair interference with contracts; libel and slander of articles of merchandise, trade names, and business credit and reputation,

Mode of access: Internet.

Variability of fracture toughness in A514/517 plate : executive summary /

Mode of access: Internet.

Book on the physician himself, and things that concern his reputation and success.

Includes index.

Should I share this? : support awareness of social sharing practice that might compromise online privacy and reputation

Thesis (Master's)--University of Washington, 2016-06

The effect of the reduction of carbon content on the toughness of high chromium white irons in the as-cast state

Three high chromium white cast irons were examined in the as-cast state to determine the effect of the carbon content on the fracture toughness. The plane strain fracture toughness K-Ic and the fracture strength were measured for each alloy. X-ray mapping was used to identify the phases on the fracture surfaces. Scanning electron fractography and optical microscopy were used to determine the volume fraction of each phase on the fracture surfaces. It was found that most fracture occurred in the eutectic carbides, but that for the alloys with a reduced volume fraction of eutectic carbides, a small amount of crack propagation occurred in the austenitic dendrites. This change in crack path correlated with an increase in fracture toughness. The Ritchie-Knott-Rice model of brittle fracture was applied. It was found to sensibly predict the critical length for fracture for each alloy. Deep etching was employed to examine the distribution of eutectic carbides. It was found that the eutectic carbides formed a continuous network in each case. (C) 2004 Kluwer Academic Publishers.

Evaluation of the indirect measures of rock brittleness and fracture toughness in rock cutting

Performance prediction models for partial face mechanical excavators, when developed in laboratory conditions, depend on relating the results of a set of rock property tests and indices to specific cutting energy (SE) for various rock types. There exist some studies in the literature aiming to correlate the geotechnical properties of intact rocks with the SE, especially for massive and widely jointed rock environments. However, those including direct and/or indirect measures of rock fracture parameters such as rock brittleness and fracture toughness, along with the other rock parameters expressing different aspects of rock behavior under drag tools (picks), are rather limited. With this study, it was aimed to investigate the relationships between the indirect measures of rock brittleness and fracture toughness and the SE depending on the results of a new and two previous linear rock cutting programmes. Relationships between the SE, rock strength parameters, and the rock index tests have also been investigated in this study. Sandstone samples taken from the different fields around Ankara, Turkey were used in the new testing programme. Detailed mineralogical analyses, petrographic studies, and rock mechanics and rock cutting tests were performed on these selected sandstone specimens. The assessment of rock cuttability was based on the SE. Three different brittleness indices (B1, B2, and B4) were calculated for sandstones samples, whereas a toughness index (T-i), being developed by Atkinson et al.(1), was employed to represent the indirect rock fracture toughness. The relationships between the SE and the large amounts of new data obtained from the mineralogical analyses, petrographic studies, rock mechanics, and linear rock cutting tests were evaluated by using bivariate correlation and curve fitting techniques, variance analysis, and Student's t-test. Rock cutting and rock property testing data that came from well-known studies of McFeat-Smith and Fowell(2) and Roxborough and Philips(3) have also been employed in statistical analyses together with the new data. Laboratory tests and subsequent analyses revealed that there were close correlations between the SE and B4 whereas no statistically significant correlation has been found between the SE and T-i. Uniaxial compressive and Brazilian tensile strengths and Shore scleroscope hardness of sandstones also exhibited strong relationships with the SE. NCB cone indenter test had the greatest influence on the SE among the other engineering properties of rocks, confirming the previous studies in rock cutting and mechanical excavation. Therefore, it was recommended to employ easy-to-use index tests of NCB cone indenter and Shore scleroscope in the estimation of laboratory SE of sandstones ranging from very low to high strengths in the absence of a rock cutting rig to measure it until the easy-to-use universal measures of the rock brittleness and especially the rock fracture toughness, being an intrinsic rock property, are developed.