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Wyszukujesz frazę "Papadopoulos, A. N." wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Mining online auction social networks for reputation and recommendation
Autorzy:
Morzy, M.
Wierzbicki, A.
Papadopoulos, A. N.
Powiązania:
https://bibliotekanauki.pl/articles/970827.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Badań Systemowych PAN
Tematy:
online auctions
reputation
recommendations
Opis:
Online auctions are quickly becoming one of the leading branches of e-commerce. Unfortunately, online auctions attract many fraudulent activities. Reputation systems are crucial for guaranteeing fairness of trade and reliability of service. Currently used reputation systems offer little protection from malevolent contractors. In this paper we present a new method for mining the reputation of sellers in online auctions. We devise two independent measures that assess reliability and questionability of sellers in parallel, leading to the concept of positive and negative reputation. To compute these measures we construct an S-graph which reflects the social linkage between sellers and buyers. We use both explicit and implicit feedbacks provided by auction participants, carefully identifying missing feedbacks that have been purposefully left out. Based on reputation estimates the community of online auction participants can detect misbehaving contractors and counteract fraud. Thus, the application of social information about reputation of contractors can be perceived as recommendations. Experimental evaluation of our proposal proves the feasibility and usefulness of the presented approach.
Źródło:
Control and Cybernetics; 2009, 38, 1; 87-106
0324-8569
Pojawia się w:
Control and Cybernetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge Transfer and f-f Transitions Studied by Photoacoustic Spectroscopy of [R(NO$\text{}_{3}$)$\text{}_{2}$(PicBH)$\text{}_{2}$]NO$\text{}_{3}$ and [R(NO$\text{}_{3}$)$\text{}_{3}$(PicBH)$\text{}_{2}$] Complexes (R - Rare Earth Ion)
Autorzy:
Guskos, N.
Papadopoulos, G.
Majszczyk, J.
Typek, J.
Wabia, M.
Likodimos, V.
Paschalidis, D. G.
Tossidis, I. A.
Aidinis, k.
Powiązania:
https://bibliotekanauki.pl/articles/2035729.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.20.Hp
32.70.-n
Opis:
High-resolution photoacoustic spectra of trinitrato-bis[N-(2-pyridyl-methylene)-N'-benzoyl-hydrazine]R (III), (R = La, Ce, Pr), and binitrato-bis[N-(2-pyridylmethylene)-N'-benzoyl-hydrazine]R(III) nitrate (R=Y, Nd, Eu, Yb, Tb, Gd, Ho, Dy, Er) complexes, in the visual region, were studied for powder samples. Very intense photoacoustic spectra of various shapes were attributed to the intraligand transitions of the π → π* type located mainly on the C=N group and the n → π* transitions located on the carbonyl group. The intensity of these transitions essentially depends on the type of rare earth ions. The existence of f-f electron transitions could influence the relaxation processes, which play an important role in intensity determination of the above transitions. For many investigated samples the energy levels of excited states of rare earth ions were identified (f-f electron transitions). The radiation energy for some of the rare earth ions were compared with the d-d electron transitions of certain copper(II) organometallic complexes, which are very important in biogenic systems. The correlation between ions with localized and extended wave functions is suggested.
Źródło:
Acta Physica Polonica A; 2003, 103, 2-3; 301-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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