Wyniki wyszukiwania dla: PORTFOLIO THEORY, MINIMUM RISK, MAXIMUM EFFICIENCY, NAIVE STRATEGY - MOST Wiedzy

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Wyniki wyszukiwania dla: PORTFOLIO THEORY, MINIMUM RISK, MAXIMUM EFFICIENCY, NAIVE STRATEGY

Wyniki wyszukiwania dla: PORTFOLIO THEORY, MINIMUM RISK, MAXIMUM EFFICIENCY, NAIVE STRATEGY

  • Disaster-Resilient Routing Schemes for Regional Failures

    Publikacja
    • T. Gomes
    • D. Santos
    • R. Girão-Silva
    • L. Martins
    • B. Nedic
    • M. Gunkel
    • B. Vass
    • J. Tapolcai
    • J. Rak

    - Rok 2020

    Large-scale natural disasters can have a profound effect on the telecommunication services in the affected geographical area. Hence, it is important to develop routing approaches that may help in circumventing damaged regional areas of a network. This prompted the development of geographically diverse routing schemes and also of disaster-risk aware routing schemes. A minimum-cost geodiverse routing, where a minimum geographical...

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  • Parametric method applicable in assessing breakout force and time for lifting slender bodies from seabed

    Publikacja

    The article presents a parametric method applicable in assessing the suction force of a slender body to the seabed, and prognosing the body extrication time. Along with the body weight in water, the information on the suction force is essential for assessing the force needed to lift the object from the seabed. Based on the Foda theory and the resulting integral equation, which relates the maximum suction force with basic parameters...

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  • Computer-assisted assessment of learning outcomes in the laboratory of metrology

    Publikacja

    - Rok 2015

    In the paper, didactic experience with broad and rapid continuous assessment of students’ knowledge, skills and competencies in the Laboratory of Metrology, which is an example of utilisation of assessment for learning, is presented. A learning management system was designed for manage, tracking, reporting of learning program and assessing learning outcomes. It has ability to provide with immediate feedback, which is used by the...

  • Bartosz Sawik

    Osoby

    Dr Bartosz Sawik is a Professor at the Department of Business Informatics and Engineering Management, AGH University of Science and Technology, Krakow, Poland and at the Institute of Smart Cities, GILT-OR Group, Department of Statistics, Computer Science and Mathematics, Public University of Navarre, Pamplona, Spain. He is a Visiting Researcher at the University of California, Berkeley, USA. He has a Ph.D. and a M.Sc. and Eng....

  • On the size of identifying codes in triangle-free graphs

    Publikacja

    - DISCRETE APPLIED MATHEMATICS - Rok 2012

    In an undirected graph G, a subset C⊆V(G) such that C is a dominating set of G, and each vertex in V(G) is dominated by a distinct subset of vertices from C, is called an identifying code of G. The concept of identifying codes was introduced by Karpovsky, Chakrabarty and Levitin in 1998. For a given identifiable graph G, let gammaID(G) be the minimum cardinality of an identifying code in G. In this paper, we show that for any connected...

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  • Sample preparation techniques for determination of pesticide residues in food samples

    Publikacja

    - Rok 2012

    Pesticides are very important in increasing the efficiency and quality of agricultural production. They are applied in many spheres of life, not only in agriculture, and their applications are expanding. Despite their numerous merits, pesticides are some of the most toxic substances contaminating our environment and have a negative impact on the human health. Properties of pesticides such as stability, ability to bioaccumulation...

  • An Alternative Proof of a Lower Bound on the 2-Domination Number of a Tree

    A 2-dominating set of a graph G is a set D of vertices of G such that every vertex not in D has a at least two neighbors in D. The 2-domination number of a graph G, denoted by gamma_2(G), is the minimum cardinality of a 2-dominating set of G. Fink and Jacobson [n-domination in graphs, Graph theory with applications to algorithms and computer science, Wiley, New York, 1985, 283-300] established the following lower bound on the 2-domination...

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  • Lean Startup as a New Way of Managing Technology Ventures Illustrated by the Example of Wlcome App

    Publikacja

    The dot-com bubble in the 1990s made the technology industry aware that even excellent ideas backed by amazing teams are not sufficient to ensure a startup’s success. The biggest risk of startups is that they have to operate within many uncertainties, their market and customers are unknown, and their business model is not yet validated. Therefore, successful execution of such a venture requires a rigorous process that would validate...

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  • Relating Information Culture to Information Policies and Management Strategies

    Publikacja

    - Rok 2021

    Business and information managers have struggled to meet several challenges in aligning information strategies and business cultures. The consequences of a misalignment or misfit of strategy and culture are well known in business literature, and better guidance on how to better align strategy and culture is needed. This means expanding the puzzle to align business and information cultures, align business and information strategies,...

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  • Synthesis of Cyano-Benzylidene Xanthene Synthons Using a Diprotic Brønsted Acid Catalyst, and Their Application as Efficient Inhibitors of Aluminum Corrosion in Alkaline Solutions

    Publikacja
    • A. Mohammed
    • G. Mersal
    • M. El-Hendawy
    • A. Shaltout
    • A. Badawi
    • J. Boman
    • A. Gobouri
    • M. Saracoglu
    • F. Kandemirli
    • R. Boukherroub... i 2 innych

    - MOLECULES - Rok 2023

    Novel cyano-benzylidene xanthene derivatives were synthesized using one-pot and condensation reactions. A diprotic Brønsted acid (i.e., oxalic acid) was used as an effective catalyst for the promotion of the synthesis process of the new starting xanthene–aldehyde compound. Different xanthene concentrations (ca. 0.1–2.0 mM) were applied as corrosion inhibitors to control the alkaline uniform corrosion of aluminum. Measurements were...

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  • MULTI-CRITERIA MODEL IN MULTIFUNCTIONAL BUILDING SYSTEM DESIGN PROCESS

    Publikacja

    - Rok 2018

    The paper presents a multi-criteria approach in multifunctional building system design process. The aim is to develop a theory relative to the engineering system of multifunctional with a mathematical representation defined by a holistic network for the lifecycle of the designed object. The idea of work was to define the structure of a complex system. Background for the presented field is to develop a design strategy for multifunctional...

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  • Community Road Safety Strategies in the Context of Sustainable Mobility

    Publikacja

    - Rok 2018

    The paper presents an overview on the road safety strategies and action plans implemented in the framework of the “SOL - Save our lives: Comprehensive road safety strategy for Central Europe” project. It contains summarization of learned knowledge regarding the efficiency of measures applied and highlights examples of good practices. The purpose of the paper is to provide recommendations for effective and successful planning, formulation...

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  • Communication Model Order Reduction in Hybrid Methods Involving Generalized Impedance Matrix

    A novel strategy for the efficient analysis of frequency-domain scattering electromagnetic problems in open and closed domains is presented. A fully automatic model-order reduction technique, called the enhanced reduced-basis method, is applied to increase the efficiency of the hybrid approach, which combines the finite-element and mode-matching methods. Numerical tests show that the proposed algorithm yields reliable and highly...

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  • Modeling of Surface Roughness in Honing Processes by UsingFuzzy Artificial Neural Networks

    Publikacja
    • I. Buj - Corral
    • P. Sender
    • C. J. L. Luis-Pérez

    - Journal of Manufacturing and Materials Processing - Rok 2023

    Honing processes are abrasive machining processes which are commonly employed to improve the surface of manufactured parts such as hydraulic or combustion engine cylinders. These processes can be employed to obtain a cross-hatched pattern on the internal surfaces of cylinders. In this present study, fuzzy artificial neural networks are employed for modeling surface roughness parameters obtained in finishing honing operations. As...

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  • A decision-making system supporting selection of commanded outputs for a ship's propulsion system with a controllable pitch propeller

    Publikacja

    - OCEAN ENGINEERING - Rok 2016

    The ship's operators have to make decisions regarding the values of commanded outputs (commanded engine speed and pitch ratio) which ensure maximum vessel speed and minimum fuel consumption. Obviously, the presented decision problems are opposed. Therefore, there is a need for a compromise solution that enables more flexible vessel voyage planning. This paper deals with development of a computer-aided system supporting selection...

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  • An Enhanced Reduced Basis Method for Wideband Finite Element Method Simulations

    In this paper, we present a novel strategy for selecting expansion points in the reduced basis method. A single computation of the error estimator is used to select a few expansion points in the multi-parameter space simultaneously. The number of selected points is determined adaptively, based on the accuracy of the current reduced model. The reliability and efficiency of this proposed approach are illustrated by numerical tests...

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  • Long-term operation of Kickuth-type constructed wetland applied to municipal wastewater treatment in temperate climate

    Publikacja

    - ENVIRONMENTAL TECHNOLOGY - Rok 2018

    The purpose of this paper is to discuss the problem of changes of effectiveness of Kickuth-type constructed wetland with subsurface flow applied to domestic wastewater treatment. This study is based on an example of a wetland 3000 m2 in surface, serving 800 inhabitants, located in Poland. The results of chemical analysis showed that after an initial year of ‘start-up time’, the efficiency of pollutant removal gradually increased...

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  • Blanka Tundys dr hab.

    Osoby

    Blanka Tundys is an Associate Professor at University of Szczecin, Poland. Her research interests span green supply chain, sustainable supply chain, close loop chain, eco-innovation, city logistics, logistics, transport systems, city economics, strategy in logistics, transportation, performance measurement in logistics and supply chain, efficiency in logistics, circular economy, smart city, risk management in the supply chain,...

  • A construction for the hat problem on a directed graph

    Publikacja

    A team of n players plays the following game. After a strategy session, each player is randomly fitted with a blue or red hat. Then, without further communication, everybody can try to guess simultaneously his own hat color by looking at the hat colors of the other players. Visibility is defined by a directed graph; that is, vertices correspond to players, and a player can see each player to whom he is connected by an arc. The...

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  • Frequency based criterion for distinguishing tonal and noisy spectral components

    A frequency-based criterion for distinguishing tonal and noisy spectral components is proposed. For considered spectral local maximum two instantaneous frequency estimates are determined and the difference between them is used in order to verify whether component is noisy or tonal. Since one of the estimators was invented specially for this application its properties are deeply examined. The proposed criterion is applied to the...

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  • Optimal Multivariable Control for Modified Z-source Based IPT

    Publikacja

    - Rok 2018

    This paper describes Z-source based inductive power transfer topologies control approaches. The goal of this work is a multi-variable control approach which involves a constant voltage/constant current control along with an optimal frequency control to obtain maximum efficiency. This control is applied to the wireless power transfer system based on a modified Z-source topology. The description of the control method along with simulation...

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  • Dempster-shafer theory-based trust and selfishness evaluation in mobile ad hoc networks

    Publikacja

    - Rok 2009

    The paper addresses the problem of selfishness detec-tion in mobile ad hoc networks. It describes an approach based on Dempster-Shafer theory of evidence. Special attention is paid to trust evaluation and using it as a metric for coping with (weighted) recommendations from third-party nodes. Efficiency and robustness of the pre-sented solution is discussed with an emphasis on resil-iency to false recommendations.

  • Independent Domination Subdivision in Graphs

    Publikacja

    - GRAPHS AND COMBINATORICS - Rok 2021

    A set $S$ of vertices in a graph $G$ is a dominating set if every vertex not in $S$ is adjacent to a vertex in~$S$. If, in addition, $S$ is an independent set, then $S$ is an independent dominating set. The independent domination number $i(G)$ of $G$ is the minimum cardinality of an independent dominating set in $G$. The independent domination subdivision number $\sdi(G)$ is the minimum number of edges that must be subdivided (each...

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  • Efficiency limit of excitonic photovoltaic cells under phosphor-based white LED illumination

    The limit of energy conversion of excitonic photovoltaic cells working under white light illumination generated by phosphor-based LED is analysed using the modified Giebink approach. Particularly, the impact of the optical energy gap and energy loss associated with the excitons dissociation at the heterojunction interface on power conversion efficiency of the device are discussed. From the results of our study it follows that the...

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  • Intencje przedsiębiorcze studentów – analiza międzynarodowa oparta na rozszerzonym modelu Ajzena

    Publikacja

    - Rok 2020

    Poszukiwanie czynników wpływających na rozpoczęcie działalności gospodarczej doczekało się opisu w wielu publikacjach. Nie ma wątpliwości, że czynnikiem kluczowym w procesie przedsiębiorczym są intencje, a dzięki pracom I. Ajzena wiadomo także, jakie grupy czynników wpływają na intencje. Jednak jego teoria planowanego zachowania wydaje się być niewystarczająca. Celem rozdziału było opracowanie propozycji rozszerzenia teorii Ajzena....

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  • Hedging Strategies of Derivatives Instruments for Commodity Trading Entities

    Publikacja

    - Rok 2015

    Hedging as an outcome of risk management arises to account several questions. Mentioned aspect of size of the hedging is one of them. Latter questioning refers to whether producer of manufacturer are willing to secure entire exposure, when the hedging should start, now or later in the future, what is the vision on market like direction of market, time of interest, magnitude of exposure, what would be the preferred instruments of...

  • Structure of the Resource Theory of Quantum Coherence

    Publikacja
    • A. Streltsov
    • S. Rana
    • P. Boes
    • R. Eisert

    - PHYSICAL REVIEW LETTERS - Rok 2017

    Quantum coherence is an essential feature of quantum mechanics which is responsible for the departure between the classical and quantum world. The recently established resource theory of quantum coherence studies possible quantum technological applications of quantum coherence, and limitations that arise if one is lacking the ability to establish superpositions. An important open problem in this context is a simple characterization...

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  • Effect of band gap on power conversion efficiency of single-junction semiconductor photovoltaic cells under white light phosphor-based LED illumination

    On the basis of the detailed balance principle, curves of efficiency limit of single-junction photovoltaic cells at warm and cool white light phosphor-based LED bulbs with luminous efficacy exceeding 100 lm/W have been simulated. The effect of energy band gap and illuminance on the efficiencies at warm and cool light is discussed. The simulations carried out show that maximum power conversion efficiency at 1000 lx reaches 52.0%...

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  • A method to synthesise groove cam Geneva mechanisms with increased dwell period

    Publikacja

    The present study develops a method to synthesise the groove cam Geneva mechanism with increased dwell period. The main condition of the synthesis is to provide the desired law of motion of the wheel. Additional synthesis conditions are the limitation of the maximum pressure angle and the limitation of the minimum curvature radius of the cam profile. Unlike the conventional Geneva mechanisms, the synthesised groove cam Geneva mechanisms...

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  • Method of sacrificial anode dual transistor-driving in stray current field

    In order to control a magnesium anode in a stray current interference field, a dual transistor driving system has been proposed. It consisted of a combination of PNP and NPN transistors. Dual transistor driven system and direct anode to cathode connection were electrochemically tested in 3% NaCl solution. The dual transistor driven system increased the anode efficiency and reduced hydrogen evolution and the risk of embrittlement....

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  • ARRIERE-GARDE IN ARCHITECTURE, AS A RESPONSE TO POST-POSTMODERN REALITY

    Publikacja

    - Rok 2016

    The article presents a general discussion on the direction of contemporary architecture. We can freely speak that postmodernity, understood in its philosophical core as a search for meaning in architecture, as a strategy of building our environment is over. What comes next? Some say, from lack of better naming, that we live in post-postmodern times. Term post-postmodernity is a call for new strategy of shaping our societies and...

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  • Improving flexibility and performance of PVM applications by distributed partial evaluation

    A new framework for developing both flexible and efficient PVM applications is described. We propose Architecture Templates Interface (ATI) that allows to control application granularity and parallelism. To ensure high application efficiency we extend partial evaluation strategy into domain of distributed applications obtaining Distributed Partial Evaluation (DPE). Both ATI and DPE were implemented using a new distributed programming...

  • Mechanism of Li nucleation at graphite anodes and mitigation strategies

    Publikacja
    • C. Peng
    • A. Bhandari
    • J. Dziedzic
    • J. R. Owen
    • C. Skylaris
    • D. Kramer

    - Journal of Materials Chemistry A - Rok 2021

    Lithium metal plating is a critical safety issue in Li-ion cells with graphite anodes, and contributes significantly to ageing, drastically limiting the lifetime and inducing capacity loss. Nonetheless, the nucleation mechanism of metallic Li on graphite anodes is still poorly understood. But in-depth understanding is needed to rationally design mitigation measures. In this work, we conducted FirstPrinciples studies to elucidate...

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  • Comparative Evaluation of Selected Biological Methods for the Removal of Hydrophilic and Hydrophobic Odorous VOCs from Air

    Due to increasingly stringent legal regulations as well as increasing social awareness, the removal of odorous volatile organic compounds (VOCs) from air is gaining importance. This paper presents the strategy to compare selected biological methods intended for the removal of different air pollutants, especially of odorous character. Biofiltration, biotrickling filtration and bioscrubbing technologies are evaluated in terms of...

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  • Computationally Effcient Solution of a 2D Diffusive Wave Equation Used for Flood Inundation Problems

    Publikacja

    This paper presents a study dealing with increasing the computational efficiency in modeling floodplain inundation using a two-dimensional diffusive wave equation. To this end, the domain decomposition technique was used. The resulting one-dimensional diffusion equations were approximated in space with the modified finite element scheme, whereas time integration was carried out using the implicit two-level scheme. The proposed...

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  • Influence of Different Biofuels on the Efficiency of Gas Turbine Cycles for Prosumer and Distributed Energy Power Plants

    Publikacja

    The efficiency of a gas turbine can be affected by the use of different biofuels usually with a relatively Lower Heating Value (LHV). The paper evaluates the impact of calorific value of fuel on turbine performance and analyzes the possibilities of optimizing turbine construction from the point of view of maximum efficiency for a particular fuel. The several variants of design of small power microturbines dedicated to various biofuels...

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  • Analiza wezbrania rzeki Kaczej w Gdyni po opadzie z 14 lipca 2016 roku

    W połowie lipca 2016 r. w Trójmieście, zanotowano opad atmosferyczny o sumie przekraczającej 150 mm. Opadom deszczu od godzin popołudniowych dnia 14 lipca do godzin rannych 15 lipca towarzyszył okresami bardzo silny i gwałtowny wiatr początkowo z kierunku północno-wschodniego następnie z kierunku północno-zachodniego. Opisana sytuacja hydro-meteorologiczna spowodowała znaczne wezbrania w rzekach i potokach rejonu Zatoki Gdańskiej,...

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  • A method of Functional Test interval selection with regards to Machinery and Economical aspects

    Publikacja

    - Rok 2018

    This paper discusses the problem of choosing the optimal frequency of functional test, including the reliability calculations and production efficiency, but also the effect of company risk management. The proof test as a part of the functional test interval is well described for the process industry. Unfortunately, this situation is not the case for the machinery safety functions with low demand mode. Afterwards, it is presented...

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  • Optymalizacja doboru prawa konstytutywnego membrany o strukturze plecionej

    Publikacja

    - Rok 2023

    Celem niniejszej dysertacji jest opracowanie zagadnienia optymalizacyjnego pozwalającego dobrać model konstytutywny opisujący mechaniczne zachowanie membrany technicznej. Do analizy wybrano membrany plecione, stosowane w medycynie, tzw. siatki chirurgiczne. W celu wykonania identyfikacji praw konstytutywnych, wykonano dwuosiowe rozciąganie próbek materiałów, otrzymując wskazanie na nieliniowe anizotropowe zachowanie materiałów....

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  • ZARZADZANIE ORGANIZACJĄ TYPU SMART

    Publikacja

    Zaprezentowano organizacji, w której charakterystykę wpisano następujące cechy: strategiczne uwarunkowanie, maksymalną innowacyjność, atrakcyjność dla interesariuszy, rozwijanie osobowości pracowników oraz twórczość w działaniu. Te atrybuty, tworzą koncepcję organizacji SMART (akronim od pierwszych liter powyższych cech), która wyróżnia się dodatkowo strukturą opartą o dynamicznie kreowane zespoły oraz skutecznym wspomaganiem...

  • Nieliniowa statyka 6-parametrowych powłok sprężysto plastycznych. Efektywne obliczenia MES

    Publikacja

    - Rok 2021

    Głównym zagadnieniem omawianym w monografii jest sformułowanie sprężysto-plastycznego prawa konstytutywnego w nieliniowej 6-parametrowej teorii powłok. Wyróżnikiem tej teorii jest występujący w niej w naturalny sposób tzw. stopień 6 swobody, czyli owinięcie (drilling rotation). Podstawowe założenie pracy to przyjęcie płaskiego stanu naprężenia uogólnionego na ośrodek typu Cosseratów. Takie podejście stanowi oryginalny aspekt opracowania....

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  • Toxicity and chemical analyses of airport runoff waters in Poland

    The aim of this study was to assess the ecotoxicological effects of various compounds in complex airport effluents using a chemical and ecotoxicological integrated strategy. The present work deals with the determination of sum of PCBs, PAHs, pesticides, cations, anions, phenols, anionic, cationic, non-ionic detergents, formaldehyde and metals – as well as TOC and conductivity – in runoff water samples collected from 2009 to 2011...

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  • Sleep Apnea Detection by Means of Analyzing Electrocardiographic Signal

    Obstructive sleep apnea (OSA) is a condition of cyclic, periodic ob-struction (stenosis) of the upper respiratory tract. OSA could be associated with serious cardiovascular problems, such as hypertension, arrhythmias, hearth failure or peripheral vascular disease. Understanding the way of connection between OSA and cardiovascular diseases is important to choose proper treatment strategy. In this paper, we present a method for integrated...

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  • Jakub Golik dr

    Jakub Golik pracuje obecnie jako Asystent w grupie pracowników badawczo-dydaktycznych Wydziału Zarządzania i Ekonomii Politechniki Gdańskiej w Katedrze Przedsiębiorczości. Jakub prowadzi badania w zakresie modeli maksymalizujących użyteczność w ekonomii; przedsiębiorczości; zagadnienia wyboru kariery oraz teorii decyzji. W swoich badaniach używa głównie metod ilościowych i eksperymentalnych, takich jak Analiza Łączna (Conjoint...

  • Parametric study of fluid flow and heat transfer over louvered fins of air heat pump evaporator

    Two-dimensional numerical investigations of the fluid flow and heat transfer have been carried out for the laminar flow of the louvered fin-plate heat exchanger, designed to work as an air-source heat pump evap- orator. The transferred heat and the pressure drop predicted by simulation have been compared with the corresponding experimental data taken from the literature. Two dimensional analyses of the louvered fins with varying...

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  • Simulation of the weight averaging of pulse frequency modulated sensor output signal

    Dane Badawcze
    open access

    The aim of the research is investigation of the efficiency of weight averaging of pulse frequency modulated signal. It was shown that from the point of view of the reduction of the sampling error the best are polynomial weighing functions, for which the maximum of this component error decreases proportionally to the appropriate power of the number of...

  • Comparison analysis of selected nuclear power plants supplied with helium from high-temperature gas-cooled reactor

    The article presents results of efficiency calculations for two 560 MW nuclear cycles with high-temperature gas-cooled reactor (HTGR). An assumption was made that systems of this type can be used in so-called marine nuclear power plants. The first analysed system is the nuclear steam power plant. For the steam cycle, the efficiency calculations were performed with the code DIAGAR, which is dedicated for analysing this type of systems....

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  • Modeling and Accuracy Assessment of Determining the Coastline Course Using Geodetic, Photogrammetric and Satellite Measurement Methods: Case Study in Gdynia Beach in Poland

    Publikacja
    • F. G. Figliomeni
    • M. Specht
    • C. Parente
    • C. Specht
    • A. Stateczny

    - Electronics - Rok 2024

    The coastal environment represents a resource from both a natural and economic point of view, but it is subject to continuous transformations due to climate change, human activities, and natural risks. Remote sensing techniques have enormous potential in monitoring coastal areas. However, one of the main tasks is accurately identifying the boundary between waterbodies such as oceans, seas, lakes or rivers, and the land surface....

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  • The protocol for using elastic wall model in modeling blood flow within human artery

    Publikacja
    • M. L. Nowak
    • B. Melka
    • M. Rojczyk
    • M. Gracka
    • A. J. Nowak
    • A. Golda
    • W. P. Adamczyk
    • B. Isaac
    • R. A. Białecki
    • Z. Ostrowski

    - EUROPEAN JOURNAL OF MECHANICS B-FLUIDS - Rok 2019

    Medical diagnostic tools will play a major role in the future for an effective patient treatment and reduction their mortality, related to the cardiovascular system diseases (CVDs). There is an urgent need for developing diagnostic procedure to be robust, reliable, accurate and efficient, in the framework of a paradigm shift. Application of numerical techniques is seen as a perspective tool for such purpose. Nevertheless, existing...

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  • Prognostic and diagnostic capabilities of OOBN in assessing investment risk of complex construction projects

    Publikacja

    Modelling decision problems using Bayesian networks is extremely valuable especially in case of issues related to uncertainty; it is also very helpful in constructing and understanding visual representation of the elements and their relations. This approach facilitates subsequent application of Bayesian networks, however there can be situations where using simple Bayesian networks is impractical or even ineffective. The aim of...

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