Search results for: PROBLEM ALLENA-CAHNA - Bridge of Knowledge

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Search results for: PROBLEM ALLENA-CAHNA

Search results for: PROBLEM ALLENA-CAHNA

  • Approximate solution for Euler equations of stratified water via numerical solution of coupled KdV system

    Publication

    We consider Euler equations with stratified background state that is valid for internal water waves. The solution of the initial-boundary problem for Boussinesq approximation in the waveguide mode is presented in terms of the stream function. The orthogonal eigenfunctions describe a vertical shape of the internal wave modes and satisfy a Sturm-Liouville problem. The horizontal profile is defined by a coupled KdV system which is...

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  • Minimum drag shape bodies moving in inviscid fluid - revisited

    This paper presents the classic approach to minimum drag shape body problem, moving at hypersonic speeds, leading to famous power law shapes with value of the exponent of 3/4. Two- and three-dimensional cases are considered. Furthermore, an exact pseudo solution is given and its uselessness is discussed. Two new solutions are introduced, namely an approximate solution due to form of the functional and solution by means of optimisation...

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  • Service-based Resilience for Embedded IoT Networks

    Publication

    - Year 2020

    Embedded IoT networks are the backbone of safety-critical systems like smart factories, autonomous vehicles, and airplanes. Therefore, resilience against failures and attacks should be a prior concern already in their design stage. In this study, we introduce a service-based network model as an MILP optimization problem for the efficient deployment of a service overlay to the embedded network by meeting QoS and resilience requirements....

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  • Wybrane sytuacje wpływające istotnie na warunki i możliwości eksploatacji infrastruktury

    Publication

    - Year 2017

    Problem wpływu warunków prowadzenia procesu inwestycyjnego na możliwości i warunki przyszłej eksploatacji. Omówiono podstawowe grupy przyczyn powodujących powstanie negatywnych sytuacji budowlanych. Podstawowe błędy procesu inwestycyjnego. Najsłabsze strony procesu. Przeciwdziałanie występującym zagrożeniom. Problem błędu człowieka

  • Muneer Ahmed Mr

    People

    Looking for an organization where I can better utilize my scientific and technical skills in the arena of research or work as a faculty person. Besides, I am also willing to work as professional engineer with dedication and diligence in dynamic environment. Likewise, I've been a committed and tenacious candidate throughout my career. I am aware of the level of commitment, dedication and strength required. Despite the fact that...

  • Deep neural networks for data analysis 24/25

    e-Learning Courses
    • J. Cychnerski
    • K. Draszawka

    This course covers introduction to supervised machine learning, construction of basic artificial deep neural networks (DNNs) and basic training algorithms, as well as the overview of popular DNNs architectures (convolutional networks, recurrent networks, transformers). The course introduces students to popular regularization techniques for deep models. Besides theory, large part of the course is the project in which students apply...

  • A graph coloring approach to scheduling of multiprocessor tasks on dedicated machines with availability constraints

    We address a generalization of the classical 1- and 2-processor unit execution time scheduling problem on dedicated machines. In our chromatic model of scheduling machines have non-simultaneous availability times and tasks have arbitrary release times and due dates. Also, the versatility of our approach makes it possible to generalize all known classical criteria of optimality. Under these stipulations we show that the problem...

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  • Scheduling of unit-length jobs with bipartite incompatibility graphs on four uniform machines

    The problem of scheduling n identical jobs on 4 uniform machines with speeds s1>=s2>=s3>=s4 is considered.The aim is to find a schedule with minimum possible length. We assume that jobs are subject to mutual exclusion constraints modeled by a bipartite incompatibility graph of degree delta. We show that the general problem is NP-hard even if s1=s2=s3. If, however, delta<5 and s1>12s2 s2=s3=s4, then the problem can be solved to...

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  • The Impact of Forms of Buildings on the Air Exchange in Their Environment. Based on the Example of Urban Development in Warsaw

    Publication

    - Year 2018

    Possibilities for energy-efficient, natural ventilation of buildings in an urban environment depend on the airflow around them. This chapter deals with the issue of dependence of air exchange in urban spaces on the building forms used in them and on relative position of these buildings. The authors focused on the problem of air stagnation in dense urban development. This phenomenon increases the energy demand of buildings. The...

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  • Sacrum - Profanum, Profanum-Sacrum, Przemiany funkcji budowli sakralnych w XX wieku = Sacrum-Profanum, Profanum-Sacrum, Transformations of function of sacral buildings in 20th century

    Publication

    - Year 2009

    Publikacja dotyczy aktualnych problemów zwiazanych z procesami desakralizacji i resakralizacji obiektów. złozony problem dotyczy krajów zarówno Europy wschodniej i zachodniej. Ulegają mu obiekty różnych obrządków i wyznań. Problem dotyczy zarówno samej architektury jak i przemian społecznych.

  • Betonowe dylematy

    Publication

    - Year 2012

    Problemy stosowania betonów w kanalizacji - szczególne zagrożenie korozją siarczanową. Problem różnic pomiędzy betonem a żelbetem. transformacja betonu na gips. Współczesne wymagania w stosunku bo betonów - zasadność przestrzegania standardów europejskich. Wytrzymałość surowca a wytrzymałość wyrobu. Problem nierównej jakości ''betonu''.

  • Gdy w sieci jest powietrze

    Powietrze w sieci wodociągowej i kanalizacyjnej. Problem blokady przepływu w przewodach ciśnieniowych. Problem podciśnienia i zasysania rury. Wtórne zmiany jakości ścieków, zagniwanie, odory. Uciążliwość dla środowiska. Skuteczne rozwiązanie dla obiektu liniowego i dla obiektu punktowego. Filtry, wypełnienia.

  • Recognition of Hand Drawn Flowcharts

    Publication

    - Year 2013

    In this paper the problem of hand drawn flowcharts recognition is presented. There are described two attitudes to this problem: on-line and off-line. A concept of FCE, a system for recognizing and understanding of freehand drawn on-line flow charts on desktop computer and mobile devices is presented. The first experiments with the FCE system and the planes for future are also described.

  • Connected searching of weighted trees

    Publication

    W pracy pokazano, że problem spójnego przeszukiwania drzew ważonych jest silnie NP-zupełny. Problem pozostaje trudnym dla drzew z jednym wierzchołkiem o stopniu większym niż 2. Ponadto, przedstawiony został wielomianowy optymalny algorytm dla klasy drzew z ograniczonym stopniem.

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  • Retencja w warunkach aglomeracji miejskich – zbiornik rurowy

    Publication

    problem retencji wód opadowych na obszarze zurbanizowanym. przykład warszawski konsekwencji braku wcześniejszej strategii. zbiornik retencyjny wód opadowych w mieście. koncepcja zbiornika rurowego. rozwiązania zbiorników rurowych np. realizacji warszawskich. problem krakowski. propozycja realizacji bezwykopowej dla obszarów szczególnie intensywnie zagospodarowanych

  • Scheduling of identical jobs with bipartite incompatibility graphs on uniform machines. Computational experiments

    We consider the problem of scheduling unit-length jobs on three or four uniform parallel machines to minimize the schedule length or total completion time. We assume that the jobs are subject to some types of mutual exclusion constraints, modeled by a bipartite graph of a bounded degree. The edges of the graph correspond to the pairs of jobs that cannot be processed on the same machine. Although the problem is generally NP-hard,...

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  • CAD. Integrated Architectural Design, BSc Arch (2024/25)

    e-Learning Courses
    • D. Cyparski

    The programme will provide students with a solid grounding in BIM (Building Information Modelling) using Autodesk's Revit Architecture. Students will review the advanced features of Revit for Architecture, a tool to support BIM (Building Information Modelling) and delivery of 3D digital models and related documentation. The lesson plans will specifically introduce students to common workflows and problem-solving skills while creating...

  • Edge-coloring of 3-uniform hypergraphs

    We consider edge-colorings of 3-uniform hypergraphs which is a natural generalization of the problem of edge-colorings of graphs. Various classes of hypergraphs are discussed and we make some initial steps to establish the border between polynomial and NP-complete cases. Unfortunately, the problem appears to be computationally difficult even for relatively simple classes of hypergraphs.

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  • Reakcje krzyżowe w immunodiagnostyce

    Publication

    - Year 2012

    Zaprezentowano problem reakcji krzyżowych w immunodiagnostyce.

  • Parallel processing subsystems with redundancy in a distributed environment

    Publication

    - Year 2006

    W pracy rozważano problem podziału systemu rozproszonego na spójne podsystemy złożone z przynajmniej trzech jednostek, pozwalające na detekcję i skorygowanie pojedynczych błędów. Wykazano, że problem maksymalizacji liczby takich jednostek jest NP-trudny nawet dla dwuspójnych kubicznych topologii sieci. Podano też nowe algorytmy przybliżone.

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  • First-order functional difference equations with nonlinear boundary value problems

    Dyskutowano problem brzegowy dla równań różnicowych z opóźnionym argumentem. Nierówności różnicowe związane z w/w problem też były przedmiotem badań. Stosując metodę iteracji monotonicznych, sformułowano warunki dostateczne na istnienie ekstremalnych rozwiązań problemów brzegowych z opóźnionymi argumentami. Podano dwa przykłady ilustrujące otrzymane wyniki.

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  • MULTIEQUATION MODELS AS DIAGNOSTIC TOOLS FOR MEASURING THE OPERATIONAL FLUIDITY OF THE CONTAINER HANDLING TERMINAL

    Publication

    - Journal of Polish CIMEEAC - Year 2017

    The article presents the continuation of the authors’ research on the problem of the operational fluidity of cargo handling sea terminals, based on the example of the DCT. The article presents a solution based on the multiequation models and applied to analyze the operational fluidity of terminals in the transshipment and feeder relation. To provide a solution to the problem of the functioning of sea-land supply chains at the terminal,...

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  • Equitable coloring of graphs. Recent theoretical results and new practical algorithms

    Publication

    In this paper we survey recent theoretical results concerning conditions for equitable colorability of some graphs and recent theoretical results concerning the complexity of equitable coloring problem. Next, since the general coloring problem is strongly NP-hard, we report on practical experiments with some efficient polynomial-time algorithms for approximate equitable coloring of general graphs.

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  • Shared processor scheduling of multiprocessor jobs

    Publication

    We study a problem of shared processor scheduling of multiprocessor weighted jobs. Each job can be executed on its private processor and simultaneously on possibly many processors shared by all jobs. This simultaneous execution reduces their completion times due to the processing time overlap. Each of the m shared processors may charge a different fee but otherwise the processors are identical. The goal is to maximize the total...

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  • Plastikowe morze - wystawa na "Sołdku"

    Events

    23-04-2019 15:00 - 23-04-2019 18:00

    23 kwietnia o godz. 15.00 w ładowniach statku-muzeum "Sołdek" otwarta zostanie wystawa "Plastikowe morze", poruszająca problem zanieczyszczenia mórz i oceanów mikroplastikiem.

  • Cofka nam niestraszna

    Publication

    - Year 2009

    Problem zalań na skutek cofki. Zagrożenia. Zabezpieczenia.

  • Scheduling with precedence constraints: mixed graph coloring in series-parallel graphs.

    Publication

    - Year 2008

    W pracy rozważono problem kolorowania grafów mieszanych, opisujący zagadnienie szeregowania zadań, w którym zależności czasowe zadań mają charakter częściowego porządku lub wzajemnego wykluczania. Dla przypadku, w którym graf zależności jest szeregowo-równoległy, podano algorytm rozwiązujący problem optymalnie w czasie $O(n^3.376 * log n)$.

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  • Bacteriophages as an antistaphylococcal agent

    Publication

    - Year 2013

    Recently observed increase of infection caused by Staphylococcus aureus is currently one of the most important problem of clinical microbiology. Most of the strains responsible for the infections are a MRSA (methicillin resistant Staphylococcus aureus) strains. In this situation commonly used antibiotics are not sufficient. There is an urgent need to search for a new nonatibiotic treatment against this pathogen. In the literature...

  • Grafo-mania, czyli rzecz o grafach i algorytmach. Spłaszczanie grafów

    Publication

    - Pismo PG - Year 2021

    W eseju poruszono problem rysowania grafów na płaszczyźnie.

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  • Study of Multi-Class Classification Algorithms’ Performance on Highly Imbalanced Network Intrusion Datasets

    Publication

    - Informatica - Year 2021

    This paper is devoted to the problem of class imbalance in machine learning, focusing on the intrusion detection of rare classes in computer networks. The problem of class imbalance occurs when one class heavily outnumbers examples from the other classes. In this paper, we are particularly interested in classifiers, as pattern recognition and anomaly detection could be solved as a classification problem. As still a major part of...

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  • Boundary value problems for ordinary differential equations with deviated arguments

    Dyskutowane są równania różniczkowe z dwupunktowym nieliniowym warunkiem brzegowym z argumentami typu odchylonego. Podano warunki dostateczne które gwarantują iż problem wyjściowy ma kwazi-rozwiązania. Podano też warunki przy których problem ten ma rozwiązanie. Wyniki uzyskano stosując metodę iteracji monotonicznych.Badano też pewne nierówności różniczkowe z odchylonymi argumentami.

  • A New Method of Noncausal Identification of Time-varying Systems

    The paper shows that the problem of noncausal identification of a time-varying FIR (finite impulse response) sys- tem can be reformulated, and solved, as a problem of smoothing of the preestimated parameter trajectories. Characteristics of the smoothing filter should be chosen so as to provide the best trade- off between the bias and variance of the resulting estimates. It is shown that optimization of the smoothing operation can...

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  • Selected aspects of determining the reliability of the pump subsystems with redundancy, used in main engine auxiliary systems

    Publication

    The rules of classification societies require the use of redundancy in the systems essential for the safety of the ship. Duplication of pumps in the main engine auxiliary systems like cooling water system, lubricating oil system, fuel oil system is a good example here. Therefore, in the author's opinion, some attention should be paid to this issue. Two important questions arise here. Does duplication of pumps in marine systems...

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  • Interval incidence coloring of bipartite graphs

    In this paper we study the problem of interval incidence coloring of bipartite graphs. We show the upper bound for interval incidence coloring number (χii) for bipartite graphs χii≤2Δ, and we prove that χii=2Δ holds for regular bipartite graphs. We solve this problem for subcubic bipartite graphs, i.e. we fully characterize the subcubic graphs that admit 4, 5 or 6 coloring, and we construct a linear time exact algorithm for subcubic...

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  • An O ( n log n ) algorithm for finding edge span of cacti

    Let G=(V,E) be a nonempty graph and xi be a function. In the paper we study the computational complexity of the problem of finding vertex colorings c of G such that: (1) |c(u)-c(v)|>=xi(uv) for each edge uv of E; (2) the edge span of c, i.e. max{|c(u)-c(v)|: uv belongs to E}, is minimal. We show that the problem is NP-hard for subcubic outerplanar graphs of a very simple structure (similar to cycles) and polynomially solvable for...

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  • A NUMERICAL STUDY ON THE DYNAMICS OF DENGUE DISEASE MODEL WITH FRACTIONAL PIECEWISE DERIVATIVE

    Publication
    • J. Khan
    • M. Ur Rahman
    • M. Riaz
    • J. Awrejcewicz

    - FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY - Year 2022

    The aim of this paper is to study the dynamics of Dengue disease model using a novel piecewise derivative approach in the sense of singular and non-singular kernels. The singular kernel operator is in the sense of Caputo, whereas the non-singular kernel operator is the Atangana–Baleanu Caputo operator. The existence and uniqueness of a solution with piecewise derivative are examined for the aforementioned problem. The suggested...

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  • Oczyszczanie wód opadowych. Separacja wskazana

    Publication

    - Year 2012

    Problem zanieczyszczeń wód opadowych. Znaczenie procesów. Wskazanie skutecznego rozwiązania.

  • Innowacje jako przedmiot obrotu rynkowego

    W artykule podjęto problem cech innowacji jako produktów, które na świecie, coraz częściej również w Polsce, stają się przedmiotem obrotu rynkowego. Różnią się zdecydowanie od produktów, oferowanych przez przedsiębiorstwa produkcyjno-usługowe na rynkach dóbr konsumpcyjnych, także gotowych dóbr przemysłowych. Kluczowe różnice wynikają z tego, że innowacja może być produktem - przedmiotem obrotu rynkowego już jako idea i koncepcja,...

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  • Szeregowanie zadań wieloprocesorowych metodą kolorowania hiperkrawędzi

    Publication

    W artykule rozważamy problem szeregowania jednostkowych zadań wieloprocesorowych na procesorach dedykowanych z repetycją zadań i ograniczeniami dostępności. Prezentujemy zebrane wyniki złożoności dla różnych typów instancji powyższego problemu szeregowania z kryteriami długości harmonogramu, sumy czasów zakończenia zadań i kosztu całkowitego. Problem ten opisujemy modelem kolorowania krawędzi różnych klas hipergrafów.

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  • Multi-criterion, evolutionary and quantum decision making in complex systems

    Publication

    - Year 2011

    Multi-criterion, evolutionary and quantum decision making supported by the Adaptive Quantum-based Multi-criterion Evolutionary Algorithm (AQMEA) has been considered for distributed complex systems. AQMEA had been developed to the task assignment problem, and then it has been applied to underwater vehicle planning as another benchmark three-criterion optimization problem. For evaluation of a vehicle trajectory three criteria have...

  • Potyczki algorytmiczne, czyli Alicja i Bogdan w nowych sytuacjach

    Publication

    - Pismo PG - Year 2024

    W kolejnym odcinku serii z Alicją i Bogdanem najpierw ilustrujemy problem dominowania w grafach (kratowych): klasyczny i rzymski. Następnie ilustrujemy znany fakt, że zachłanność nie zawsze się opłaca. Pokażemy mianowicie, że algorytmy zachłanne nie gwarantują uzyskania rozwiązania optymalnego, nawet wówczas gdy problem da się rozwiązać w czasie wielomianowym.

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  • Complexity Issues on of Secondary Domination Number

    Publication

    - ALGORITHMICA - Year 2023

    In this paper we study the computational complexity issues of the problem of secondary domination (known also as (1, 2)-domination) in several graph classes. We also study the computational complexity of the problem of determining whether the domination and secondary domination numbers are equal. In particular, we study the influence of triangles and vertices of degree 1 on these numbers. Also, an optimal algorithm for finding...

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  • CAD. Integrated Architectural Design, MSc Arch (2022/2023)

    e-Learning Courses
    • D. Cyparski

    The programme will provide students with a solid grounding in BIM (Building Information Modelling) using Autodesks Revit Architecture. Students will review the advanced features of Revit for Architecture, a tool to support BIM (Building Information Modelling) and delivery of 3D digital models and related documentation. The lesson plans will specifically introduce students to common workflows and problem-solving skills while creating...

  • CAD. Integrated Architectural Design, BSc Arch (2023-24)

    e-Learning Courses
    • D. Cyparski

    The programme will provide students with a solid grounding in BIM (Building Information Modelling) using Autodesks Revit Architecture. Students will review the advanced features of Revit for Architecture, a tool to support BIM (Building Information Modelling) and delivery of 3D digital models and related documentation. The lesson plans will specifically introduce students to common workflows and problem-solving skills while creating...

  • CAD. Integrated Architectural Design, BSc Arch (2024/25)

    e-Learning Courses

    The programme will provide students with a solid grounding in BIM (Building Information Modelling) using Autodesk's Revit Architecture. Students will review the advanced features of Revit for Architecture, a tool to support BIM (Building Information Modelling) and delivery of 3D digital models and related documentation. The lesson plans will specifically introduce students to common workflows and problem-solving skills while creating...

  • Taking advantage of symmetries: gathering of asynchronous oblivious robots on a ring

    Publication

    - Year 2008

    W pracy rozważano problem rendezvous (spotkania, zebrania) dla zbioru bezpamięciowych robotów umieszczonych na wierzchołkach cyklu nieskierowanego, niewyposażonych w urządzenia komunikacyjne. Przyjęto model systemu rozproszonego występujący w literaturze pod nazwą asynchronicznego systemu z cyklami Look-Compute-Move. Problem istnienia rozwiązania rozwiązano dla wszystkich konfiguracji poczatkowych składających się z więcej niż...

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  • Shadow Economy in Poland Recent Evidence Based on Survey Data

    Publication

    - Year 2021

    The book provides an estimate of the size of the shadow economy in Poland. Using analogous data, it traces core determinants of the existence of the shadow economy in Poland. It compares results with neighbouring countries, and if possible, the remaining Central-Eastern economies. The book tells why the problem of the unreported economic activity matters; it presents the problem from different angles―economic, social and institutional....

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  • Wietrzenie sieci

    Publication

    Zagadnienia ochrony sieci przed odorami. Problem odpowietrzania w aspekcie hydrauliki

  • Jaki znak twój?

    Publication

    - Forum Akademickie - Year 2003

    Artykuł porusza problem nieumiejętnego kreowania tożsamości wizualnej przez uczelnie polskie.

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  • Odpowiadam bo wypada.

    Publication

    - Year 2004

    Szczególne zagadnienia techniczne montażu wodomierza - dokładność rejestracji. problem wiarygodności wskazań.