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      MegaByte is an online magasine (journal) for promotion of research results from IT&C and economicy field of Titu Maiorescu University from Computer Science and Economical Sciences Faculty.

2011 - 11th Volume

Computer Science
No.
Article Title
1
 
PERFORMANCE ASPECTS OF COMPANIES WORKING UNDER THE CMT SYSTEM
Authors: Teodor Hada

Abstract: The current study describes the notions regarding production under the CMT system (cut, made, trim), the CMT contracts and the particularities of this type of production. The case study presented in the paper puts forward the definitions of performance and its indicators, such as effect over resources, economic and financial profitability

Tags: CMT system, contracts, pelax soles, active CMT, passive CMT

Article code: MGBT-2011-1-CS-TH-345
 
2
 
GENERATING ASSOCIATION RULES IN DATABASES USING DISCRETIZATION BASED ON CLUSTERING
Authors: Daniela Joita

Abstract: In this paper we analyse of the performance of two discretization methods based on clustering on some classification algorithms. We also use the same methods as the pre-processing step for generating association rules using the Apriori Algorithm and we test them against other discretization methods.

Tags: discretization, clustering, k-means, Apriori Algorithm, HAC

Article code: MGBT-2011-1-CS-DJ-362
 
3
 
PROCESSING AN OPINION POLL USING FUZZY TECHNIQUES
Authors: Petru Vasiliu

Abstract: In this paper we deal with a multi criteria ranking problem, based on fuzzy input data : the purpose is to compare the effect of different metrics defined on the space of fuzzy numbers on the dynamics of the unique ranking. As the main instrument, we use fuzzy synthesis to mediate different rankings ; in this respect, the convolution product of fuzzy numbers occurs .A system of fuzzy weights is used, to enable the ordering criteria.

Tags: triangular fuzzy number; similarity coefficient; fuzzy multi-criteria decision making; discrete normed fuzzy set

Article code: MGBT-2011-1-PV-DJ-362
 

4
 
A NEW METHOD TO IMPROVE THE SAFETY AND THE RANDOMNESS OF A PSEUDORANDOM BIT GENERATOR BASED ON A CHAOTIC MAP
Authors: Ana Cristina Dascalescu

Abstract:Chaotic cryptology is widely investigated recently. This paper reviews the progress in this area and points out some existent problems in digital chaotic ciphers like the predictability of the generated values using the orbits of a sole system and the low space of the keys. As a comprehensive solution to these problems, a novel method based on a composition of chaotic systems is presented. We will prove, using mathematically concepts from discrete dynamical nonlinear systems, that the composition of chaotic maps preserves and, moreover, improves the chaotic behavior of a single map. Also we present a detailed theoretical and statistical analysis for a pseudo number generator based on the proposed method. It is show that it has perfect cryptographic properties, and it can be used to construct stream ciphers with higher security. Some experiments are made for confirmation.

Tags: chaotic systems, pseudo random, chaotic maps, stream cipher

Article code: MGBT-2011-1-CS-ACD-346
 
5
 
A NEW CHAOTIC BIDIMENSIONAL MAP SUITABLE FOR IMAGES ENCRYPTION
Authors: Radu Boriga

Abstract:Chaotic bidimensional maps have aroused a great interest mainly in the encryption of images. Some maps of this type (Baker map, Cat map, etc.) have became a standard in the area of images encryption. In this letter, we propose a new kind of chaotic map based on the equation of a plane curve called the serpentine curve. We have studied the randomness of the keystreams generated by a PRNG based on the new function, both theoretically, using theory of discrete chaotic systems, and practically, using the DIEHARD battery of tests.

Tags: chaotic systems, pseudo random, cryptography, stream cipher, transcendental equations

Article code: MGBT-2011-1-CS-RB-347
 

6
 
TRENDS IN MOBILE COMMUNICATION
Authors: Marian Pirloaga

Abstract:In this paper i describe some principals technics used in mobile communications in order to improve performance and increase data transmission rate, especially inMIMO-OFDM systems combining techniques MIMO and OFDM. One of the advantages of OFDM is the flexibility concerning modulation and multiple access techniques. Adaptive subcarrier allocation and adaptive modulation being applied to the OFDM-FDMA and OFDM-TDMA, respectively, are considered.Ofdm makes efficient use of the spectrum by allowing overlap.By dividing the channel into narrowband flat fading subchannels, OFDM is more resistant to frequency selective fading than single carrier systems are.He using adequate channel coding and interleaving one can recover symbols lost due to the frequency selectivity of the channel.The channel equalization becomes simpler than by using adaptive equalization techniques with single carrier systems.

Tags: OFDM,spatial diversity,channels,multiusers,multiplexing

Article code: MGBT-2011-1-CS-MP-348
 
7
 
THE DESIGN OF RESILIENCE P2P NETWORKS WITH DISTRIBUTED HASH TABLES
Authors: Dorina Luminita COPACI, Constantin Alin COPACI

Abstract:The term resilience in computer systems and networks is often used in relationship with other terms, e.g., fault tolerance, dependability, availability, reliability. Hash tables which map ,,keys'' onto ,,values'' are an essential building block in P2P networks. In this paper, we introduce two concepts: a Content-Addressable Network (CAN) and Chord as distributed infrastructures that provides hash table-like functionality on Internetlike scales.

Tags: Peer-to-peer overlay, edge resilience, node resilience

Article code: MGBT-2011-1-CS-LC-349
 
8
 
ALGORITHMS FOR ANALYZING OF THE RESILIENCE IN COMMUNICATION NETWORKS AND P2P OVERLAY
Authors: Dorina Luminita COPACI, Constantin Alin COPACI

Abstract:In this paper, we present a survey of strategies to improve resilience in communication networks as well as in P2P overlay networks. By using some basic concepts from graph theory, we show that many concepts for communication networks are based on well-known graph-theoretical problems. P2P overlay networks evidently benefit from resilience-enhancing strategies in the underlying communication infrastructure, but beyond that, their specific properties pose the need for more sophisticated mechanisms.

Tags: Peer-to-peer networks, resilience, distributed hash table

Article code: MGBT-2011-1-CS-LC-348
 

Economical Sciences
No.
Article Title
1
 
THE HOUSING PROBLEM IN THE REPUBLIC OF MOLDOVA
Authors: Albu Svetlana

Abstract: One of the main problems that a society has to deal with is the housing. The goal of this research consists in the examination of the dwelling stock in the Republic of Moldova, the development tendencies through the last decade and the estimation of the level of its affordability.

Tags: dwelling stock, housing development, new trends in housing, housing affordability

Article code: MGBT-2011-1-ES-AS-542
 

2
 
VOIDNESS - SANCTION OF THE ADMINISTRATIVE ACT
Authors: Emanoil Popescu

Abstract: The voidness concept is necessary in order to separate the illegal administrative acts of the administration (that may be attacked in court according to the rules of the administrative contentious matters) from illicit facts (because a void act put into forced by by the administration is equivalent to an illicit fact), when the contentious rules present in the matter of the acts are not applicable anymore. For that, we should approach the problem of the notion of voidness, of the void act, the forms of the administrative act voidness (voidness of fact and legal voidness), the hypostases of juridical voidness caused by the lack of an existential validity element, the consequences of the administrative act voidness, and also the vices of the act that bring the sanction of its voidness.

Tags: voidness, voidness of fact, juridical voidness, void act, tetra-dimensional competence

Article code: MGBT-2011-1-ES-EP-543
 

3
 
REFORMING FOREIGN LANGUAGE TEACHING IN EUROPE. MULTILINGUAL EDUCATION, CURRICULAR CHANGES, INNOVATION AND CREATIVITY IN TEACHING, DIVERSIFYING TEACHING METHODS
Authors: Sorin Ivan

Abstract: Communication in foreign languages is a priority for the EU and the globalized world. The Knowledge Society is based on education and communication. Multilingualism is one of the key principles of the New Europe, which is developing in the framework of the unity in diversity concept. Teaching and learning foreign languages is a process of prime importance of the European Union and a priority of educational policy in the European countries. Two documents prepared by the Council of Europe, Common European Framework of Reference for Languages and The Guide for the Development of Language Education Policies in Europe have a crucial role in these policies. Language teaching reform in European countries, organizing and developing multilingualism include important elements such as: diversification of the roles of teachers, stimulating, managing and evaluating educational innovation, decompartimentalization of teaching, language curriculum adaptation, diversification of language teaching methods.

Tags: multilingualism, multiculturalism, linguistic diversity, multilingual education, quality, competence, proficiency, pragmatism.

Article code: MGBT-2011-1-ES-SI-543
 





 
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