Studies in Informatics and Control


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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Biochemical processes at wastewater treatment plant are complex, nonlinear, time varying and multivariable. Moreover, relationships between processes are very strong. One of the most important issues is exerting proper control over dissolved oxygen levels during nitrification phase. This parameter has a very large impact on activity of microorganisms in activated sludge and on quality of pollution removal processes. Oxygen is supplied by aeration system which consists of many nonlinear elements (blowers, pipes, diffusers). In this paper, the sequencing batch reactor is applied and modelled. Also, the aeration system is modelled. Those models are validated based on real data sets. The adaptive control system with anti-windup filter is proposed and designed for tracking the reference trajectory of dissolved oxygen. Furthermore, the reference trajectory of dissolved oxygen is generated by the supervisory controller using NH4 measurements. Simulation results of control system are calculated for a case study plant located in Swarzewo, Northern Poland. www:
    Studies in Informatics and Control 11/2014; 23(4):323-332.
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    ABSTRACT: The Information and Communication Technologies and digital economy are the key factors in the recovery of the EU economy and especially the Romanian economy. Based on its strengths in technology and knowledge, Europe should exploit the full potential of the digital economy. The digital economy and information technologies offer great opportunities for SMEs in the manufacturing and service sectors. Therefore, an ambitious Digital Agenda, providing concrete steps to complete the online single market will be a key to sustainable economic recovery and social development of Europe. The competitive advantage of each country will play an important role in sustaining its future prosperity. Information technologies offer new ways of enhancing sustainable development not only in urban areas but also, to an even greater extent, in rural areas throughout the world. The understanding of what makes them a success or failure, and how much impact they may have in contributing to the wider rural economy is still relatively poorly developed. What is clear, from a wider European perspective, is that these new forms of e-agriculture with ecological entrepreneurialism are growing at a relatively fast rate This paper presents multi-criteria AHP method, (Analytic Hierarchy Process) to assess main technological factors that affect the introduction of new technologies in rural areas.
    Studies in Informatics and Control 06/2014; 23(2):215-222.
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    ABSTRACT: Applications of continuous production line technique is of vast use today when there is a high demand for mass production. One of the main disadvantages consists in high receptiveness to malfunctions since a single fault can stop or affect the quality of the entire production line. The paper presents an improved solution of (re)balancing a parallel control structure and maintaining the ratio between two adjustment quantities. Applicability is proved on a control structure of the ratio using two groups of tanks, a situation that has been encountered in the chemical industry, food industry, pharmaceutical industry etc. Meanwhile the proposed structure may represent an interesting solution that could be implemented within supervisory level.
    Studies in Informatics and Control 03/2014; 23(1):53-64.
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    ABSTRACT: The choice of the parameters has strong influence on the quality of the results obtained by the application of algorithms. Most researchers tend to select the values of their parameters in long and tedious trial and error approaches. Although, some methods have been developed for automatic parameter selection, they have not been widely used in the computer vision area. This paper presents the design of a general purpose framework for automatic parameter selection through a case study: a human limb tracking algorithm developed for applications that will be used in rehabilitation scenarios with low cost equipment. The tracking algorithm first detects the limb by using a skin segmentation approach, then the position of an idealized limb model is updated using Simulated Annealing. The framework for automatic parameter selection treats each parameter from the tracking algorithm according to its domain and uses a modified version of Harmony Search Optimization algorithm that includes a dominance criterion. The obtained results are presented as well and show that selected parameters behave well for the case of study.
    Studies in Informatics and Control 01/2014; 23(1):87-96.
  • Studies in Informatics and Control 01/2014; 23(1):31-40.
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    ABSTRACT: In this paper the financial risk of crop plans is measured by two symmetric risk measures: variance and mean absolute deviation of the return. Several crop planning models with symmetric risk measures, based on the financial portfolio theory, are formulated. Among them minimum risk and maximum expected return models are of interest. The decision variables are the land areas allocated to crops. The models belong to mathematical programming with continuous variables. Some numerical examples for the minimum financial risk model are studied and efficient frontiers of the models are displayed.
    Studies in Informatics and Control 01/2014; 23(4):333-341.
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    ABSTRACT: The paper presents the development of a new software tool integrated with SolidWorks CAD system for generating feasible disassembly directions based on the concept of mobility operator. In generating the disassembly path of a component, our approach considers that two steps are undertaken: first, the interface between components is broken and then the component is extracted from the assembly by translating it along a collision free removal path. Different data from the CAD model of the assembly is automatically detected, such as: geometrical constraints, contact surfaces relative position, common area, components neighbours, etc. Based on this information, a general mobility operator is deployed, which is further used to evaluate the families of trajectories associated to the contacts between different components of a mechanical system. Thus, the developed mobility operator mathematically expresses all possible movements between assembly components (rotations, translations and helical movements), and it can be used for a real time graphical representation of components mobilities, mandatory aspects in developing a virtual environment for simulating the Assembly/Disassembly (A/D) tasks as part of an efficient Product Design Process (PDP).
    Studies in Informatics and Control 12/2013; 22(4):307-318.
  • Studies in Informatics and Control 12/2013; 22(4):299-206.
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    ABSTRACT: Wireless Sensor Networks (WSN) are highly vulnerable in their security. They are generally deployed in hostile environments to collect different kinds of data, so they are exposed to serious physical and software attacks. Therefore, developing methods to increase security becomes an essential aspect of the study of these networks. WSNs are used in military, medical and biological applications, among others. This paper analyzes the security requirements of WSNs, the main attacks, and their main characteristics; finally it reviews some security methods currently proposed or implemented in these networks, and identifies the possible types of security attacks that can affect the layers of the OSI Reference Model.
    Studies in Informatics and Control 09/2013; 22(3):323-329.
  • Studies in Informatics and Control 07/2013; 66(7):100-115.
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    ABSTRACT: This paper outlines the optimization problem of nonlinear constrained multi-objective economic/environmental dispatch (EED) problems of thermal generators in power systems and presents novel improved real-coded genetic optimization (MO-RCGA) algorithm for solving EED problems. The considered problem minimizes environmental emission and non-smooth fuel cost simultaneously while fulfilling the system operating constraints. The proposed MO-RCGA technique evolves a multi-objective version of GA by proposing redefinition of global best and local best individuals in multi-objective optimization domain. The performance of the proposed MO-RCGA enhanced with biased Initialization, dynamic parameter setting, and elitism is carried out. The validity and effectiveness of the proposed MO-RCGA is verified by means of several optimization runs accomplished at different population sizes on standard IEEE 30-bus test system. Simulation results demonstrated the capabilities of the proposed MO-RCGA algorithm to obtain feasible set of effective well-distributed solutions.
    Studies in Informatics and Control 06/2013; 22(2):113-122.
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    ABSTRACT: The problem of finding an appropriate path for a mechanical arm that tries to reach a target among obstacles is one of the most important in fields of automation and robotics. It is both a classic inverse kinematics and collision detection problem. This project aimed to construct a tool to plan a path for an articulated arm through a two-dimensional environment with obstacles. The inverse kinematics problem is addressed by heuristics Bayesian particles filter, and the collision detection problem is solved using computational geometry methods for calculating the free configurations space. The proposed tool has a graphical interface with which you can get information from the designed experiments. The feasibility of this approach and its advantages in complex two-dimensional environments is shown. We proved that good results can be obtained with an appropriate selection of the parameters.
    Studies in Informatics and Control 06/2013; 22(2):185-193.
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    ABSTRACT: The rapid expansion of social networking websites is raising several issues as regarding the influence on the individual and social behavior of users. Using SNW is growing rapidly among the various groups of people. From the educational point of view it is important to know how to effectively use the opportunities offered/created by SNW. The amount of empirical research to support SNW educational usefulness is limited. On the other hand, there is a need to have some reliable instruments to measure educational usability of SNW. In this paper we present a hierarchical and multidimensional measurement model to explore the social usefulness of these websites. The model has been tested on one sample and cross validated on another sample
    Studies in Informatics and Control 01/2013; 22(2):175-184.