2014. 1st issue
Full issue (27MB)
PAPERS FROM OPEN CALL
Á. Knapp and L. Pap
General Performance Analysis of Binary Fading Channels with Measurement Based Feedback Channel Equalization
This paper presents a new general analytical technique for exact error rate analysis of coherent and noncoherent binary wireless communication systems in the presence of nonselective slow fading, additive white Gaussian noise (AWGN) and using measurement based feedback channel equalization technique by estimating the fading channel gain in an independent noisy pilot (measuring) channel. New exact bit error rate expressions are derived for coherent and orthogonal noncoherent binary system and the presence of different fading statistics. These results are derived in the case of signals experiencing Rayleigh, Rician or Nakagami-m fading. The results can be extended to arbitrary M-ary modulation.
Guided Self-Organization for Edge ICT Fabrics
This paper is arguing that technology advances and cost reductions in processing, storage and communications will determine a growing amassing of resources at the edge of current networks (i.e., in the distribution and access areas, up to end Users premises). This trend, intertwined with new emerging
paradigms such as Software Defined Networks, will impact deeply the evolution future networks and services, enabling the deployment of novel flexible architectures capable of creating a galaxy of new ICT business opportunities. It is argued that the sheer number of nodes, devices and smart systems being deployed at the edge will create a sort of distributed "fabric" offering an enormous processing and storage power. On the other hand, the level of complexity and dynamism of said "fabric" will pose challenging requirements for the orchestration and management of edge resources, which could be faced by deploying a sort of bottom-up self-organization meeting classical top-down management approaches.
Z. Pödör, M. Edelényi, L. Jereb
Systematic Analysis of Time Series - CReMIT
One of the problems frequently arising in connection with the study of time series is the most thorough examination of any correlations between them. In the case of time series with periodicity, study of the effects of periods with time shifting, delayed and varying length can be also examined. We present a data transformation procedure that allows more intensive studies by the systematic expansion of the basic data set due to the applied special window technique (CReMIT). To apply it in the practice, the method has been integrated in a uniform analyzing process that includes operations from the preparation of data lines for analysis, via their systematic transformation to the implementation of the analyses. The modular structure of the system provides high flexibility due to which the process can be suitable for the study of relations between time series of any type in practice by using the adequate expansions.
The Piggy Bank Cryptographic Trope
This paper presents applications of the trope of the locked and sealed piggy-bank into which the secret can be easily inserted but from which it cannot be withdrawn without opening the box. We present a basic two-pass cryptographic scheme that can serve as template for a variety of implementations. Together with the sealed piggy-bank is sent a coded letter that lists and certifies the contents of the box. We show how this idea can help increase the security of cryptographic protocols for classical systems as well as those based on "single-state" systems. More specifically, we propose the use of a hashing digest (instead of the coded letter) to detect loss of key bits to the eavesdropper and use in communication systems where error correction is an important issue.
PAPERS FROM RELATED AREAS
B. Molnár, Gy. Szabó and A. Benczúr
Investigation of System of Criteria within Selection Processes for ERP Systems - A Middle-European perspective
The application and introduction of ERP systems have become a central issue for management and operation of enterprises. The competition on market enforces the improvement and optimization of business processes at enterprises to increase their efficiency, effectiveness, and to manage better the resources outside of the company. The primary task of ERP systems is to achieve the before-mentioned objectives. For this reason the selection of a particular ERP system has a decisive effect on the future operation and profitability of the enterprise, i.e. the selection phase is highly relevant step within the introduction and implementation stage of an ERP system. The issues that are worth investigating are the criteria applied at the decision. The qualitative correlation between the size of enterprises, market position, etc. and the applied selection criteria for ERP systems could be analyzed as to whether which criteria are made use of at multinational enterprises or at SMEs. Our research is grounded in a literature review and case studies of everyday practice related to introduction, implementation and roll-out of ERP systems and it tries to provide answers for the above raised questions..