Intense and long-lasting rains often cause troubles to the population in many cities and to proper urban planning and civil defense activities it is necessary to know the expected precipi1 Biometria e Estatística Aplicada, Univ. Federal Rural de Pernambuco-UFRPE, cavalcanti.rodrigo@gmail.com 2 Biometria e Estatística Aplicada, Univ. Federal Rural de Pernambuco-UFRPE, chsestatistica@gmail.com 3 Biometria e Estatística Aplicada, Univ. Federal Rural de Pernambuco-UFRPE, elielmas93@gmail.com 4 Doutor em Agronomia, Univ. Federal Rural de Pernambuco-UFRPE, moacyr2006@gmail.com 5 Doutora em Física, Univ. Federal Rural de Pernambuco-UFRPE, tastosic@gmail.com tation. In this work, we pursued to estimate the probable maximum precipitation (PMP) daily and accumulated from 2 to 7 days for Recife-PE and to estimate the return time for the PMPs found. Moreover, based on the theoretical distribution function of the data, calculate the PMPs for 2, 5, 10, 20, 50, 100 and 200 years. The pluviometric data were captured by the data collection platform (DCP) of the National Institute of Space Research (NISR) for the period 1998 to 2012. The adjustment of the Gumbel distribution was observed through the Kolmogorov-Smirnov test at the level of significance of 5%, the parameters of this distribution were obtained by the moments method. The estimates for the PMPs were determined by the Hersfield method, where it considers the frequency of annual maximum rainfall data recorded at the site of interest. Excel and R software were used for the analysis. The results showed that in the accumulated 2 days, the return time of the PMP of 548mm is 82 years. It was estimated that every 2 years, rainfall events occurring at or above 125mm in 24 hours and that every 5 years rainfall events occurring at or above 211mm in 24 hours. Such results should support policies of civil defense and urban planning to mitigate damages to mobility, habitation, economy and life.

: This paper analyzes the properties of Catalan numbers and their relation to the Lattice Path combinatorial problem in cryptography. Specifically, analyzes the application of the appropriate combinatorial problem based on Catalan-key in encryption and decryption of files and plaintext. Accordingly, we use Catalan numbers for generating keys and within the experimental part we have applied the NIST (National Institute of Standards and Technology) statistical battery of tests for assessing the quality of generated keys was applied. A total of 12 quality assurance tests for Catalan-key were applied. A Java application is presented which allows the encryption and decryption of plaintext based on the generated Catalan-key and combinatorial problem of movement in integer network or Lattice Path. Experimental study yields the comparison of results in text encryption speed for combinatorial encryption methods (such as: Ballot Problem, Stack permutations and Balanced Parentheses) in comparison with Lattice Path method (in Java programming language).

The paper describes some authentication techniques based on face recognition with emphasis on 2D and 3D facial recognition technologies. The paper presents analyzes that show that the success of a biometric system requires the measurement of its performances through several different types of parameters. Presented are the features and comparative analysis of the two120 | Zoran Lončarević , Muzafer Saračević, Muhedin Hadžić dimensional method of face recognition in relation to three-dimensional ones, based on numerous researches published in professional and scientific papers. The paper emphasize that it is necessary to analyze, in addition to the system performance, the errors that occur in biometric systems during the process of registration, verification and identification. An OpenCV library has been analyzed with it’s over 500 functions that cover several areas of Computer Vision and the area of automatic format recognition.