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Μόνιμο URI για αυτήν τη συλλογήhttps://hellanicus.lib.aegean.gr/handle/11610/17086
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Τεκμήριο Does Social Networking Substitute for or Stimulate Teenagers’ Travel? Findings from a Latent Class Model.(2013) Kamargianni, M.; Polydoropoulou, A.The aim of this paper is to investigate and quantify the influence of various social networking (SN) usage styles on adolescents’ travel behavior. For this purpose a latent class model is developed, which incorporates SN usage styles as higher-level individual orientations influencing the number of trips made for social purposes. The latent class model consists of two parts: 1. The class membership model, which links the latent SN usage styles to socio-demographic variables; and 2. the classspecific choice model, which is a Poisson regression and shows the influence of an SN usage style and socio-economic variables on the number of trips made for social purposes. The methodology is tested with data from a survey conducted in Cyprus in 2012 and refers only to adolescents. The survey provides data on 15,693 social trips of 9,735 participants (20% of the total high-school population). The class membership model indicates that there are four latent SN usage styles, while the results of the class-specific model indicate that the rational SN usage style (Class 1) and the SN addiction (Class 3) increases the number of social trips, while the indifference in SN usage (Class 2) and non-SN-users (Class 4) affects negatively the number of social trips. The results of the study provide insights into how SN usage affects Net Generations travel behavior, and especially trip substitution vs complementarity, while the class specific model is rich in interpretation, and serves as a harbinger for policy-makers.Τεκμήριο Geographic Information System. Ptolemeos - Regional Turkey(2012) Karkazis, J.A thumb rule approach to express the regional efficiency (attractiveness) of geographical areas or administrative units is the position efficiency. Let Ei1, Ei2, … , Ein, Mi1, Mi2,..., Mim be the values of criteria (statistics) according to which the socio-economic image of an area Ai will be assessed (i=1,2,…,k). Let also assume that for the first n criteria maximization is required to attain efficiency whereas for the last m of them minimization is required. An area Ai is characterized by position efficiency at level k, in the context of a set (A1, A2,…, Ak) of k areas under assessment, if for any criterion j under assessment Eij is among the k largest values of the set (E1j, E2j,…,Enj) and at the same time Mij is among the k smallest values of the set (M1j, M2j,…,Mkj). ...Τεκμήριο Seaports Activity (A)synchronicity, Trade Intensity and Business Cycle Convergence: A Panel Data Analysis(2013) Tsamourgelis, I.; Paflioti, P.; Vitsounis, T.In the present paper we suggest and test a general model that aims to explain the determinants and the extent of parallel moving (i.e. the synchronization) of trading ports activities. The model adopts a macro-approach and its main constituents are a) the business cycle (GDP) convergence, b) the intensity of trade between the countries of origin and destination, and c) the variables associated to international shipping developments. The present study makes possible the identification of distinct influences on the link between a given country’s economic and port activities influences which can traced back mainly to macro policies. The elaboration of such determinants and their relationships contribute to a better understanding of the dynamics of port throughput and facilitates infrastructure planning and strategic policy decision. The present paper’s conclusions feature a framework for modeling the relationship between ports and shipping activities. Panel data from European main ports for the period 1986-2010 were used for the empirical investigation and a dynamic panel GMM estimation technique was employed. Model simulations are conducted and provide evidence that an increase or decrease of port business cycle synchronization is a) attributed to the technical and structural characteristics of ports and, b) greatly influenced by the general macroeconomic environment.