No. 7/2018

Online archive of Computer Science and Mathematical Modelling

No. 7/2018

  1. A. Ameljańczyk - The solutions similarity of the similar conflicts
    Pages: 5 - 10
    Abstract: The work deals with the examination of solutions similarity of similar conflicts, presented in the form of multiperson cooperative games. There is examined the similarity of the two most well-known in the literature concepts of the cooperative game solutions: Shapley solution and nucleolus (Schmeidler solution [9]). The work presents an idea of using a solution of the pattern conflict most similar to the considered conflict as a its solution.
    Keywords model of conflict, cooperative game, similarity of conflicts, ideal game, pattern recognition.
    Full article: PDF icon 5_10_aameljanczyk_csmm_7.pdf
  2. A. Horubała, D. Waszkiewicz, M. Andrzejczak, P. Sapiecha - Data confidentiality and computations hiding in cloud services for public administration
    Pages: 11 - 18
    Abstract: Cloud services are gaining interest and are very interesting option for public administration. Although, there is a lot of concern about security and privacy of storing personal data in cloud. In this work mathematical tools for securing data and hiding computations are presented. Data privacy is obtained by using homomorphic encryption schemes. Computation hiding is done by algorithm cryptographic obfuscation. Both primitives are presented and their application for public administration is discussed.
    Keywords public administration, obfuscation, homomorphic encryption.
    Full article: PDF icon 11_18_andrzejczak_horubala_sapiecha_waszkiewicz_csmm_7.pdf
  3. M. Miecznik, J.W. Mietelski, E. Łokas, K. Kleszcz - Modeling of the Cs137 and Sr90 contamination transportation process performed for the vicinity of National Radioactive Wastes Disposal in Różan (NE Poland)
    Pages: 19 - 30
    Abstract: This paper contains the results of radionuclides transportation modeling under National Radioactive Waste Disposal (NRWD) grounds in Różan (northeast Poland). The disposal is of the low- and intermediate-level waste (LILW) type. We simulated the radionuclides transportation process through sandy soils. The simulation was performed in a self-written simulator in Scilab using the finite difference method. The model included diffusion, advection and radioactive decay. The model was tested according to convergence and stability. Assuming the hydrological gradient being 0.008, the contamination transportation time was 30–46 years depending on the modeled problem. The modeled distance of 600 m was from underneath the disposal to the exudation in the Narew ravine. Radioactive decay for both cesium (Cs137) and strontium (Sr90) had a significant impact on the results. The model proved to be a useful tool for performing simple scientific simulations. This survey was part of a PhD thesis.
    Keywords advection, diffusion, radioactive decay.
    Full article: PDF icon 19_30_mmiecznik_csmm_7.pdf
  4. P.A. Ryszawa - Modelling quantum register disentanglement
    Pages: 31 - 44
    Abstract: Implementing quantum-inspired algorithms on classical computers suffers trade-off between the necessity of saving operational memory and the amount of memory necessary to fully represent a quantum state with possible entanglement. The latter is well known to consume the memory exponentially in the number of qubits. This paper sketches out the idea on how to reduce significantly the amount of necessary memory while distorting the entanglement moderately or not at all. At present, considered are real nonnegative probability amplitudes.
    Keywords quantum computing, quantum entanglement, disentanglement, quantum register.
    Full article: PDF icon 31_44_pryszawa_csmm_7_v2.pdf
  5. B. Szafrański, M. Zieja, J. Wójcik, K. Murawski - Data analysis of information system TURAWA in the aspect of data mining methods
    Pages: 45 - 52
    Abstract: The article is devoted to the analysis of data coming from the operation process and collected in computer system TURAWA, which focuses on supporting the management of flight safety in the Polish Air Force. The Armed Forces are equipped with a system, which collects and processes data concerning the whole air crew, all performed flights and all aircraft. The increasing opportunities in obtaining data and the continuous development of data mining methods allow to extract information never been known before, which, together with conclusions obtained from the data analysis, will help to improve the level of flight safety.
    Keywords flight safety, data mining, TURAWA.
    Full article: PDF icon 45_52_jwojcik_csmm_7.pdf