Now showing 1 - 10 of 27
  • research article;
    Narbekovas, Andrius
    Journal of Advances in Medicine and Medical Research. Delhi : Ms. M.B. Mondal, 2022, vol. 34, iss. 19, JAMMR. 87806., p. 77-82
    Backround: In recent years, there is an increasing number of data supporting the relation between lunar cycle and alterations in human body. For instance, it has been proved that hospitalized spontaneous abortions are significantly associated with the lunar cycle . Given that the most common cause of spontaneous abortion is chromosomal abnormalities of the embryo, we presumed that the lunar cycle could influence the occurrence of chromosomal diseases. From the point of bioethics it is a question if it is applicable to talk with patients about possible impact of cosmobiological factors on their case of chromosomal anomaly. Patients and Methods: We have selected 52 patients, who were bearing a fetus with a prenatally diagnosed chromosomal disorder, which included Down, Turner, Klinefelter, Patau and Edward syndromes. The control group (n=92) consisted of families, that were prenatally tested for chromosomal abnormalities and the results were negative. Then we gathered and analyzed information from patients' medical histories about various factors, which could have predisposed chromosomal disorders: age of both progenitors, consumption of medications during pregnancy, number of miscarriages, number of abortions, cases of genetic disorders in relatives, lunar phase on the day of conception. Results: Lunar phases at the time of conception in the test group distributed as following: new Moon 32.7 percent, first quarter 25.0 percent, full Moon 28.8 percent, third quarter 13.5 percent. In the control group lunar phases distributed as following: new Moon 29.3 percent, first quarter 27.2 percent, full Moon 26.1 percent, third quarter 17.4 percent. There was observed no statistically significant difference between test and control groups (p>0.05). OR for conception with chromosomal anomalies were increased in July (2.7(CI 95% 1.5-4.9) and December (3.2 (CI 95% 1.5-5.2) (p<0.05). OR showed decreased risk for chromosomal anomalies during conception at January (0.3 (CI 95% 0.1-0.7) , April (0.5 (CI 95% 0.2-0.7) and June 0.5 (CI 95% 0.2-0.8) (p<0.05). Conclusions: Our study showed there were no associations between lunar phase at the time of conception with the rates of chromosomal mutations. Conception in July and December increases the risk of chromosomal anomalies during conception. In contrast conception in January, April and June decreases chromosomal anomalies rates.
  • research article;
    Journal of Advances in Medicine and Medical Research. Delhi : Ms. M.B. Mondal, 2022, vol. 34, iss. 15., p. 1-6
      Background: Despite all efforts to ensure road safety, road deaths rank eighth in the world. More than 3,500 people die on the world's roads every day, almost 1.3 million. avoided deaths and around 50 million injuries annually. Aim  of  the  Study: The aim of the study was to investigate the links between risky driving and psychopathic traits. Materials  and  Methods: 257 drivers participated, ranged from 18 to 66 years. A multivariate linear regression analysis was performed to determine if psychopathy predicts risky driving. Methods used in the study: the Driving Behavior Questionnaire to measure risky driving and the Triarchial Psychopathic Measures Questionnaire to measure psychopathic traits. Results: Drivers with a higher degree of psychopathic disinhibition trait commit more driving errors, slips and lapses, aggressive and ordinary driving violations; Drivers with a higher degree of psychopathic meanness trait commit more aggressive and ordinary driving violations; Drivers with a higher degree of psychopathic boldness trait make fewer driving mistakes and have a lower overall risk of driving; Psychopathy traits can predict risky driving and the disinhibition trait of psychopathy has the highest prognostic value in predicting risky driving. Conclusion: Psychopathy traits shows relationship with risky driving and psychopathy trait disinhibition can prognose risky driving.    
  • research article
    Miškinis, Paulius
    Krylovas, Aleksandras
    Mathematical modelling and analysis : the Baltic journal on mathematical applications, numerical analysis and differential equations. Vilnius : Taylor&Francis, VGTU, 2017, vol. 22, iss. 3., p. 337-351
    In the paper, an asymptotic analysis of G.F. Carrier's mathematical model of string oscillation is presented. The model consists of a system of two nonlinear second order partial differential equations and periodic initial conditions. The longitudinal and transversal string oscillations are analyzed together when at the initial moment of time the system's solutions have amplitudes proportional to a small parameter. The problem is reduced to a system of two weakly nonlinear wave equations. The resonant interaction of periodic waves is analyzed. An uniformly valid asymptotic approximation in the long time interval, which is inversely proportional to the small parameter, is constructed. This asymptotic approximation is a solution of averaged along characteristics integro-differential system. Conditions of appearance of combinatoric resonances in the system have been established. The results of numerical experiments are presented.
    WOS© IF 0.716WOS© AIF 0.855Scopus© SNIP 0.601
  • research article
    Engineering analysis with boundary elements. Oxford : Elsevier, 2016, Vol. 67., p. 164-172
    Radial basis function domain-type collocation method is applied for an elliptic partial differential equation with nonlocal multipoint boundary condition. A geometrically flexible meshless framework is suitable for imposing nonclassical boundary conditions which relate the values of unknown function on the boundary to its values at a discrete set of interior points. Some properties of the method are investigated by a numerical study of a test problem with the manufactured solution. Attention is mainly focused on the influence of nonlocal boundary condition. The standard collocation and least squares approaches are compared. In addition to its geometrical flexibility, the examined method seems to be less restrictive with respect to parameters of nonlocal conditions than, for example, methods based on finite differences.
    WOS© IF 1.721WOS© AIF 1.694Scopus© SNIP 1.171
  • research article;
    Kosareva, Natalja
    Mathematical modelling and analysis : the Baltic journal on mathematical applications, numerical analysis and differential equations. Vilnius : Technika, 2015, Vol. 20, no. 3., p. 409-421
    The problem of ranking (sorting) of m alternatives is considered when experts evaluate each alternative according to k criteria. Functions of arithmetic and geometric averages are constructed for decision making. We present a generalization of this scheme when there are evaluation matrices of several experts and this information is aggregated in the form of triangular intuitionistic fuzzy numbers. Fuzzy triangles were constructed with di erent uncertainty levels, experts decision matrices and the number of experts varied from 2 to 5. Moreover, method for construction of experts decision probability matrices is proposed in the paper. Ranking results obtained by performing Monte Carlo simulations. Probabilities of errors are compared for arithmetic, geometric, fuzzy arithmetic and fuzzy geometric averages.
    WOS© IF 0.468WOS© AIF 0.735Scopus© SNIP 0.667
  • research article
    Lithuanian mathematical journal. New York : Springer, 2014, vol. 54, no. 2., p. 192-202
    We propose necessary and sufficient conditions for a complex-valued function f on Rn to be a characteristic function of a probability measure. Certain analytic extensions of f to tubular domains in Cn are studied. In order to extend the class of functions under study, we also consider the case where f is a generalized function (distribution). The main result is given in terms of completely monotonic functions on convex cones in Rn.
    WOS© IF 0.667WOS© AIF 0.741Scopus© SNIP 0.851
  • research article
    Baležentis, Tomas
    Journal of multi-criteria decision analysis [Optimization, learning, and decision support]. Chichester : John Wiley & Sons Ltd, 2014, vol. 21, Issue 3-4.
    This paper focuses on the MULTIMOORA method. Specifically, it discusses its development as well as extensions alongside with an overview of their applications. Indeed, the MULTIMOORA is a relatively new multi-criteria decision making method consisting of the three parts. Therefore, it is specific with peculiarities of both complete and partial aggregation techniques. The MULTIMOORA method consists of the three parts, namely the Ratio System, the Reference Point, and the Full Multiplicative Form. The paper discussed the extensions of MULTIMOORA into the fuzzy environment and group decision making. The carried out survey identified the two major areas of application of MOORA and MULTIMOORA, namely engineering decision support for technological development and economic researches. The economic researches can further be classified into those related to micro-level or macro-level analyses.
    Scopus© SNIP 0.93
  • research article
    Computers and mathematics with applications. Kidlington : Pergamon, 2014, vol, 67, no 7., p. 1407-1420
    The development of numerical methods for the solution of partial differential equations (PDEs) with nonlocal boundary conditions is important, since such type of problems arise as mathematical models of various real-world processes. We use radial basis function (RBF) collocation technique for the solution of a multidimensional linear elliptic equation with classical Dirichlet boundary condition and nonlocal integral conditions. RBF-based meshless methods are easily implemented and efficient, especially for multidimensional problems formulated on complexly shaped domains. In this paper, properties of the method are investigated by studying two- and three-dimensional test examples with manufactured solutions. We analyze the influence of the RBF shape parameter and the distribution of the nodes on the accuracy of the method as well as the influence of nonlocal conditions on the conditioning of the collocation matrix.
    WOS© IF 1.697WOS© AIF 1.097Scopus© SNIP 1.863
  • Publication
    Modeling and simulation of cloud computing solution for distributed space data storage and access in mobile communication networks
    [Mākoņskaitļošanas risinājuma modelēšana un simulācija izkliedētai kosmiskas izcelsmes datu glabāšanai un piekļuvei mobilos komunikāciju tīklos]
    research article
    Kurmis, Mindaugas
    Didžiokas, Rimantas
    Trokss, J.
    Latvian journal of physics and technical sciences. Rīga : LZA Fizikālās enerģētikas institūts, 2013, vol. 50, no. 5., p. 20-28
    Storage and retrieval of space signals require an advanced set of core technologies that can be implemented with a cloud computing paradigm. In this work we propose a cloud computing solution for the distributed space data storage and access in mobile communication networks. The modeling and simulation results show that the proposed solution performs satisfactorily in the space data processing. In the future, experimental verification of the cloud computing model and its implementation are envisaged.
    Scopus© SNIP 0.863
  • research article
    Engineering analysis with boundary elements. Oxford : Pergamon-Elsevier, 2013, Vol. 37, iss. 4., p. 788-804
    Various real-world processes usually can be described by mathematical models consisted of partial differential equations (PDEs) with nonlocal boundary conditions. Therefore, interest in developing computational methods for the solution of such nonclassical differential problems has been growing fast. We use a meshless method based on radial basis functions (RBF) collocation technique for the solution of two-dimensional Poisson equation with nonlocal boundary conditions. The main attention is paid to the influence of nonlocal conditions on the optimal choice of the RBF shape parameters as well as their influence on the conditioning and accuracy of the method. The results of numerical study are presented and discussed.
    WOS© IF 1.437WOS© AIF 1.403Scopus© SNIP 1.633