Spatial Analysis of 5-Star Hotels in Istanbul

Turkey has achieved great success in the tourism sector which started a greater than ever trend towards hotel investments. While, new investors are entering to the market, international brands are pursuing strategies to increase their existing supply. Istanbul, Turkey’s largest city, besides being a world-famous tourist attraction, also draws substantial foreign investment which escalates both the demand and supply in the hotel market. In the light of previous researches conducted by Dökmeci and Balta (1999) this research focuses on the supply side and the spatial development of high-end hotels in Istanbul. By revisiting the works of von Thünen and Alonso, compares rings of urban location for hotels in Istanbul in terms of rent as overnight room rates. Location data are accumulated from Ministry of Tourism, local municipalities, chambers and unions. Overnight hotel rates were collected through internet booking sites, telephone inquiries and visits during October, November and December of 2010. As the polycentric development of the city has increased over the last decade and many functions have been decentralized or shifted, the analysis reveals valuable insight into urban tourism pattern. The results coincide with the concentric rings described by the previous researches although many new hotels were constructed, new sub-centers had formed and the importance of sub-centers has increased dramatically.

Reentrant Phase Transitions of the Blume-Emery-Griffiths Model for a Simple Cubic Lattice on the Cellular Automaton

The spin-1 Ising (BEG) model with the nearest-neighbour bilinear and biquadratic interactions and single-ion anisotropy is simulated on a cellular automaton which improved from the Creutz cellular automaton(CCA) for a simple cubic lattice. The simulations have been made for several sets of parameters $K/J$ and $D/J$ in the $-3<D/J\leq 0$ and $-1\leq K/J\leq 0$ parameter regions. The re-entrant and double re-entrant phase transitions of the BEG model are determined from the temperature variations of the thermodynamic quantities ($M$, $Q$ and $\chi$). The phase diagrams characterizing phase transitions are compared with those obtained from other methods.Comment: 12 pages 7 figure

Grayscale Image Authentication using Neural Hashing

Many different approaches for neural network based hash functions have been proposed. Statistical analysis must correlate security of them. This paper proposes novel neural hashing approach for gray scale image authentication. The suggested system is rapid, robust, useful and secure. Proposed hash function generates hash values using neural network one-way property and non-linear techniques. As a result security and performance analysis are performed and satisfying results are achieved. These features are dominant reasons for preferring against traditional ones.Comment: international journal of Natural and Engineering Sciences (NESciences.com) : Image Authentication, Cryptology, Hash Function, Statistical and Security Analysi

Capacity Constraint, Price Discrimination, and Oligopoly

In the presence of market power in oligopolistic environment, price discrimination is a natural phenomenon. Surprisingly this setting has not been analyzed in depth in the literature. In contrast with existing literature, e.g., Hazledine (2006) and Kutlu (2009), we consider quantity setting games where firms compete in two stages. In the first stage firms decide on the choice of capacity and in the second stage they decide on the structure of price discrimination where the level of price discrimination is exogenous. In contrast to Hazledine (2006) we find that in the Cournot framework the quantity-weighted average price depends on the level of price discrimination. We also find that in the Stackelberg framework both the leader and the follower price discriminate as opposed to Kutlu (2009) which concludes that the leader doesn't price discriminate. Moreover, it is discovered that both the players (even the follower) prefer to be in the Stackelberg framework rather than the Cournot framework when price discrimination exists. Comparing welfare under various settings, it is found that competition is not always good for the total welfare if price discrimination exists. desirable axioms.