37 research outputs found

    Towards Applying River Formation Dynamics in Continuous Optimization Problems

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    River Formation Dynamics (RFD) is a metaheuristic that has been successfully used by different research groups to deal with a wide variety of discrete combinatorial optimization problems. However, no attempt has been done to adapt it to continuous optimization domains. In this paper we propose a first approach to obtain such objective, and we evaluate its usefulness by comparing RFD results against those obtained by other more mature metaheuristics for continuous domains. In particular, we compare with the results obtained by Particle Swarm Optimization, Artificial Bee Colony, Firefly Algorithm, and Social Spider Optimization

    The method for automatic identification of characteristics of electrical power unit angular velocity adjusters

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    W artykule przedstawiono propozycj臋 algorytmu identyfikacji charakterystyk zadajnik贸w pr臋dko艣ci k膮towej. Rozwi膮zania te znajduj膮 zastosowanie w nowoczesnych synchronizatora automatycznych realizuj膮cych funkcj臋 szybkiego 艂膮czenia obiekt贸w elektroenergetycznych do pracy r贸wnoleg艂ej w systemie elektroenergetycznym, szczeg贸lnie w sytuacjach ruchowych wymagaj膮cych zdecydowanego oraz szybkiego dzia艂ania. Przeprowadzone badania eksperymentalne potwierdzaj膮 skuteczno艣膰 zaproponowanych rozwi膮za艅.The paper describes a method for identification of angular velocity adjuster characteristics (Fig. 2). An algorithm (Fig. 4) of its practical application in modern and microprocessor automatic synchronizers operating according to the latest known methods (Fig. 1) is presented. These methods allow for significant, even several times - in relation to the solutions used on a large scale and generally regarded as classics - shortening of the connection process duration. Hence, the proposed solutions can play a special role in many situations requiring a decisive action and fast connection of electrical power units to operate in parallel. Such situations can occur during a sudden demand for electricity in a power electric system - one of which should certainly include cases of threatened blackout - whose effects and consequences can be very serious. The experimental tests fully confirm the effectiveness of the proposed solutions. Thus, they confirm the possibility to automatize tedious and time-consuming processes connected with identification of the characteristics of angular velocity adjusters connecting power electrical objects

    Adaptable method of synchronization in electric power system

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    W artykule przedstawiono nowo opracowan膮, adaptacyjn膮 metod臋 synchronizacji pr膮dnic w systemie elektroenergetycznym. Metoda ta w por贸wnaniu z metodami dotychczas stosowanymi posiada szereg zalet, do kt贸rych z pewno艣ci膮 nale偶y zaliczy膰: skr贸cenie czasu trwania procesu synchronizacji, inny ani偶eli dotychczas spos贸b sterowania napi臋ciem i pr臋dko艣ci膮 k膮tow膮 synchronizowanego obiektu, zwi臋kszona dok艂adno艣膰 ekstrapolacji (funkcj膮 wymiern膮) chwili zgodno艣ci fazowej napi臋膰.In this paper, new design adaptable method of synchronization in electric power system has been presented. This method in comparison with actually implemented methods has a lot of advantages: short time of synchronization process, other way of sending control signals from automatic synchronizers and high precision of extrapolation time phase coincidence

    Modeling of respiratory mechanics in obesity

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    Przedmiotem publikacji jest przedstawienie propozycji modelowania i zasad wizualizacji zmian w mechanice uk艂adu oddechowego, u os贸b z nadwag膮 lub oty艂o艣ci膮. W badaniach wykorzystano 16-elementowy model elektryczny uk艂adu oddechowego. Dob贸r warto艣ci parametr贸w modelu odbywa艂 si臋 na podstawie wiedzy dost臋pnej w literaturze medycznej. Opracowanie mo偶e by膰 szczeg贸lnie przydatne in偶ynierom dokonuj膮cym wst臋pnej weryfikacji nowo opracowywanych system贸w medycznych lub na etapie dokonywania przegl膮d贸w okresowych aparatury medycznej.The subject of the publication is a proposal of approach to modeling and visualization of changes in pulmonary mechanics, for people impaired by obesity or serious overweight. Previously developed models of the patient respiratory system were based on parameter identification of the considered models with the help of the measured data [3]. In this paper the modeling procedures basing on the basic medical knowledge in the field of clinical obesity (BMI> 35) are proposed. In the research a 16-coefficient electrical model of the respiratory system (Fig. 1), presented previously in [8], was used Most of lesions causing the changes in parameter values, described in Section 2, simulate the changes in mechanics of respiratory tract and lungs. The range and nature of the changes in the model parameter values are the subject of Section 3. The results of simulations of the respiratory volume (Fig. 3) and the flow (Fig. 4) are presented in Section 4. Moreover, the result of respiratory mechanics examination obtained by FOT is shown in Fig. 6. The presented time courses are consistent with the results available in the medical literature, obtained as a result of the medical examinations (Fig. 5). That proves the legitimacy of the presented approach and demonstrates the functionality of lesions modeling based on basic medical knowledge. This approach may be particularly useful for engineers providing preliminary verification of newly developed medical systems or at the stage of servicing the medical equipment

    Niezawodno艣膰 transmisji danych protoko艂u UDP w elektroenergetycznych systemach teletransmisyjnych wsp贸艂pracuj膮cych z sieci膮 Internet

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    W artykule przedstawiono istot臋 niezawodno艣ci transmisji danych przesy艂anych, w oparciu o zorientowany bezpo艂膮czeniowo protok贸艂 komunikacyjny UDP, w elektroenergetycznych systemach teletransmisyjnych, wsp贸艂pracuj膮cych z sieci膮 Internet. Problematyka ta dotyczy szczeg贸lnie niewielkich (cz臋sto bezobs艂ugowych) obiekt贸w elektroenergetycznych, w kt贸rych proces monitorowania mo偶e by膰 realizowany za po艣rednictwem powszechnie dost臋pnej infrastruktury sieci Internet i odpowiedniego centrum monitorowania. Wskazano na najistotniejsze 藕r贸d艂a b艂臋d贸w w procesie transmisji oraz mo偶liwo艣ci cz臋艣ciowej ich eliminacji. Przedstawiono tak偶e opracowane i wykonane narz臋dzia diagnostyczne, metodologi臋 i wyniki przeprowadzonych bada艅 oraz najistotniejsze, wynikaj膮ce z tych bada艅 wnioski

    Usage of the UDP protocol for objects monitoring throught the public internet network

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    W referacie przedstawiono ide臋 monitorowania stanu rozproszonych obiekt贸w za po艣rednictwem publicznej sieci Internet z wykorzystaniem bezpo艂膮czeniowego protoko艂u UDP. Om贸wiono w艂a艣ciwo艣ci metod przesy艂ania danych oraz rodzaje i 藕r贸d艂a b艂臋d贸w komunikacji powoduj膮cych ich utrat臋. Przedstawiono metodyk臋 i wyniki przeprowadzonych bada艅 niezawodno艣ci komunikacji w publicznej sieci Internet oraz najistotniejsze, wynikaj膮ce z nich wnioski.The idea of monitoring of distributed objects state by the UDP protocol in the Internet network has been presented in this paper. The methods of data transferring, sorts and sources of transmission errors have been described. Moreover the computer program to tests of reliability in transmission process and the main results of the tests has been presented

    Identification the parameter representing inertia of masses flowing water throw the pipes.

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    W artykule przedstawiono spos贸b identyfikacji warto艣ci parametru reprezentuj膮cego bezw艂adno艣膰 masy przep艂ywaj膮cej wody dla hydrozespo艂贸w pracuj膮cych przy du偶ym spadzie i d艂ugich ruroci膮gach. Opisany spos贸b identyfikacji wykorzystywany jest w adaptacyjnej metodzie synchronizacji. Do identyfikacji wykorzystuje si臋 uproszczony model matematyczny uk艂adu regulacji pr臋dko艣ci k膮towej oraz pocz膮tkow膮 faz臋 odpowiedzi synchronizowanego obiektu.In this paper the identification method of the parameter representing the inertia of masses flowing water throw the pipes for water plants are presented. The value of this parameter is used in adaptable method of synchronizing power generators. The identification based on the simplified mathematical model of the speed control system for water plant working with large slope and long pipes and initial phase of the response of synchronizing power object

    Computer application supporting upper gastrointestinal tract disease diagnosis based on pH-metry analysis

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    W artykule przedstawiono propozycj臋 pierwszego modu艂u opracowanej i wykonanej aplikacji komputerowej wspomagaj膮cej proces diagnostyki choroby refluksowej prze艂yku (GERD) lub refluksu gard艂owo-krtaniowego (LPR) poprzez automatyzacje procesu wyznaczania ca艂kowitej liczby DeMeestera oraz liczby Ryana. Efektem dzia艂ania aplikacji jest propozycja diagnozy (bazuj膮ca na autorskim algorytmie analizy przebiegu pH) metod膮 DeMeestera lub Rayana. Dodatkowym atutem aplikacji jest mo偶liwo艣膰 zapoznania u偶ytkownika ze wszystkimi parametrami po艣rednimi (tzw. tabel膮 DeMeestera) oraz warto艣ci膮 wska藕nika, na podstawie kt贸rego zosta艂a zaproponowana diagnoza.This paper presents a proposal of a developed computer application supporting the process of GERD (gastroesophageal reflux disease) and LPR (laryngopharyngeal reflux) diagnosis by automating the tasks to determine the DeMeester or Rayan score. The main effect of the application is the proposal of GERD and LPR diagnosis based on the DeMeester and Rayan score (with use of proprietary algorithms of pH course autoanalysis). Another advantage of the given application for a user is the possibility to read all of the intermediate parameters (so called DeMeester table) and the value of the indicator upon which a basis of the proposed diagnosis was stated. Out of all invasive GERD diagnostics methods the mostly used technique remains the 24-hour ambulatory esophageal pH-metry, by which a recording of the esophageal pH changes in time are obtained. In the next stage of the evaluation, physician鈥檚 interpretation of the results is required to find all of the characteristic parameters in the pH course and then calculation of the so called DeMeester score is necessary. For a physician performing the relevant assessment procedure the above described procedure is very tedious and time consuming and - taking into account specificity of the analysis - accompanied with high risk of error. The application described in this paper can be also successfully used for teaching purposes at any stage of acquiring necessary knowledge and experience in the process of diagnosing GERD and other diseases of the upper gastrointestinal tract. Nowadays in the era of major technological developments it is obvious for medical staff to be ready to take challenge of implementing fast and reliable diagnosis of GERD (especially when facing with the rising expectations regarding gastroenterologists)

    System lokalizacji i identyekacji oparty na glifach optycznych

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    Glify optyczne s膮 nieskomplikowanymi znakami graficznymi zawieraj膮cymi zakodowan膮 informacj臋. Dzi臋ki wykorzystaniu technik przetwarzania obrazu i rozpoznawania wzorc贸w mo偶liwa jest implementacja skutecznego systemu globalnego wspomagaj膮cego nawigacj臋 autonomicznych pojazd贸w. Prostota systemu pozwala na 艂atwe jego wdro偶enie, bez konieczno艣ci przebudowy aparatury monitoruj膮cej. Zapewnia r贸wnie偶 mo偶liwo艣膰 skorzystania w procesie projektowania z powszechnie dost臋pnego oprogramowania open source. W artykule przedstawiono algorytm, kt贸rego zadaniem jest wyszukanie wprowadzonych do bazy symboli obiekt贸w oraz ustalenie ich pozycji i orientacji w globalnym uk艂adzie wsp贸艂rz臋dnych kamery. Szybko艣膰 i niezawodno艣膰 systemu wykazano na podstawie bada艅 eksperymentalnych z u偶yciem rzeczywistych robot贸w mobilnych.Optical glyphs are non-complex graphic signs that contain encoded information. By utilizing techniques of image processing and pattern recognition, it is possible to implement an effective global system for autonomous vehicle navigation. The simplicity of the system allows it to be easily implemented, without having to rebuild monitoring equipment. It also provides the possibility to use, during the design process, of widely available open source software. This paper presents an algorithm, whose task is to find the symbols of objects contained in the database and determine their position and orientation in the global coordinate system of the camera. The speed and reliability of the system has been demonstrated on the basis of experimental studies using real mobile robots

    Application supporting the process of calculating human Body Surface Area

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    W artykule przedstawiono struktur臋 opracowanego i wykonanego systemu komputerowego BSA Analysis Tool, wspomagaj膮cego procesy obliczeniowe wybranych parametr贸w organizmu cz艂owieka: BSA, TBSA i BMI. W materiale, poza opisem systemu, wskazano na utylitarny charakter opracowania, szczeg贸lnie w przypadku: o艣rodk贸w medycznych - jako narz臋dzie wspomagaj膮ce procesy leczenia oparze艅 i chemioterapii oraz w o艣rodkach naukowo-dydaktycznych jako narz臋dzie wspomagaj膮ce procesy dydaktyczne.The paper describes in detail capabilities and a structure of the BSA Analysis Tool system which was developed for supporting the calculation and analysis process of human BSA (Body Surface Area), TBSA (Total Body Surface Area) and BMI (Body Mass Index). In some practical applications, the BSA coefficient can be determined using online calculators, but they are not that strongly developed. Moreover, the program allows calculating automatically the TBSA, replacing the hand-filled tables procedure. Advanced functions of the program allow for its use in medical centers as a tool assisting the treatment of burns or chemotherapy, as well as centers of research and teaching. The complex structure of the application consists of two main layers: clinical and scientific (Fig. 1). The BSA coefficient can be calculated on the basis of ten mostly used methods, while the value of the TBSA coefficient can be calculated on the basis of three methods. For calculating the BSA, only the most necessary data about the patients is required: body weight, height, age and gender, whereas the TBSA value in addition depends on the size of the body damaged area. The scientific layer structure is composed of three modules: comparison of methods for calculating the BSA, comparison of the BSA and BMI coefficients and analysis of the BSA surfaces. These tools enable a thorough analysis of the BSA coefficient (Figs. 2 and 3) as well as fast and accurate calculations of the BSA and TBSA
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