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    Wyświetlanie 1-10 z 10
    Tytuł:
    DYNAMIC FINANCIAL ANALYSIS IN THE INSURANCE COMPANY – CONCEPTION, PROCESS AND APPLICATION (Dynamiczna analiza finansowa w zakladzie ubezpieczen - koncepcja, przebieg i zastosowanie)
    Autorzy:
    Wartini, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/599517.pdf
    Data publikacji:
    2010
    Wydawca:
    Wyższa Szkoła Informatyki i Zarządzania z siedzibą w Rzeszowie
    Tematy:
    INSURANCE COMPANIES
    OPTIMIZATION TECHNIQUES
    STATISTICAL SIMULATION METHODS
    Opis:
    Dynamic Financial Analysis has become the irreplaceable and comprehensively used tool used by insurance companies. The process of Dynamic Financial Analysis is not accidental, it involves the stochastic scenario generator, input and output. It integrates various models and techniques from finance and actuarial science into one 'multivariate' dynamic simulation model. That modern approach to risk management and decision making provides for the integrated and holistic quantitative analysis of all significant risk factors affecting the insurer, helping management improve the business strategy.
    Źródło:
    Finansowy Kwartalnik Internetowy e-Finanse; 2010, 6, 4; 76-91
    1734-039X
    Pojawia się w:
    Finansowy Kwartalnik Internetowy e-Finanse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sampling methods for investment portfolio formulation procedure at increased market volatility
    Autorzy:
    Dzicher, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2027253.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Investment decisions
    Optimization techniques
    Portfolio selection
    Statistical simulation methods
    Opis:
    Aim/purpose–In this paper, a market volatility-robust portfolio composition frame-work under the modified Markowitz’s approach with the use of sampling methods is developed in order to improve the allocation efficiency for a portfolio of financial instruments formulation procedure at an increased market volatility.Design/methodology/approach–In order to overcome the risk of not receiving an optimal solution to the portfolio optimization (suboptimal outcomes of attribution of weights in allocation procedures) the developed model, first, implements the rationale that financial markets largely feature two states, i.e., quiescent (non-crisis; low market volatility) periods that are occasionally interspersed with stress (crisis; high market volatility) periods and, second, relies on many input samples of rates of return, either from an empirical distribution or a theoretical distribution (mitigating estimation risk). All computational results are reported for publicly available historical daily data sets on selected Polish blue-chip securities. Findings–Not only did the presented method produce more diversified allocation, but also successfully minimized the unfavorable effects of increased market volatility by providing less risky portfolios in comparison to Newton’s method, typically used for optimization under portfolio theory. Research implications/limitations–The research emphasized that in order to get a more diversified investment portfolio it is crucial to outdo the limitations of a single sample approach (utilized in Markowitz’s model) which may on some occasions be statistically biased. Thus it was proved that sampling methods allow to obtain a less concentrated and volatile allocation which contributes the investment decision-making. However, the current research focused solely on publicly available input data of particular securities. In this manner, an additional analysis can be prepared for other jurisdictions and asset classes. There can also be considered a use of other than variance risk measures.Originality/value/contribution–The suggested framework contributes to existing methods a wide array of quantitative data analysis and simulation tools for composing an unique approach that directly addresses the task of minimizing the adverse implications of increased market volatility that, in consequence, pertains to knowledgeable attributing of investment portfolio proportions of either individual or institutional investors. The prepared method is also proved to hold demanded computational quality and, importantly, the capacity for further development.
    Źródło:
    Journal of Economics and Management; 2021, 43; 70-89
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Superconducting Antenna Integrated with a Diplexer for Radio-Astronomy Applications
    Autorzy:
    Donelli, M.
    Febvre, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/309365.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    diplexer
    microwave antenna
    optimization techniques
    particle swarm algorithm
    radio astronomy
    Opis:
    This paper presents the design of a compact frontend diplexer for radio-astronomy applications based on a self complementary Bow-tie antenna, a 3 dB T-junction splitter and two pass-band fractal lters. The whole diplexer structure has been optimized by using an evolutionary algorithm. In particular the problem of the diplexer design is recast into an optimization one by dening a suitable cost function which is then minimized by mean of an evolutionary algorithm namely the Particle Swarm Optimization (PSO). An X band diplexer prototype was fabricated and assessed demonstrating a good agreement between numerical and experimental results.
    Źródło:
    Journal of Telecommunications and Information Technology; 2014, 3; 113-118
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Advancements in Optical Fibres Communication
    Autorzy:
    Singh, Sarthak
    Sharma, Himanshu
    Powiązania:
    https://bibliotekanauki.pl/articles/1075566.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Graphene material
    Optical Fiber Cable
    Optimization Techniques
    Total Internal Reflection
    Opis:
    Presently the optical fibres are mainly used in the wide area networking (WAN).The major research issues in optical communication are the development of innovative techniques to avoid physical damages, design of the efficient communication techniques and challenges faced by due to ecology & environmental issues.
    Źródło:
    World Scientific News; 2019, 121; 67-72
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative study of PID controller designs for AVR using different optimization techniques
    Autorzy:
    Hesham, Haya
    Ezzat, M.
    Swief, Rania A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841193.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    comparison
    optimization techniques
    PID controller
    AVR system
    porównanie
    techniki optymalizacji
    Regulator PID
    System AVR
    Opis:
    This paper presents the optimal PID tuning study to improve the dynamic performance of an automatic voltage regulation (AVR) system. The system under study consists of a synchronous generator whose reference voltage changes in a step function and tries to overcome the transient behavior of its terminal voltage smoothly. To optimally control the performance, different optimization techniques are applied to tune the controller gains to obtain the minimum steady state error (main objective) and better dynamic characteristics (rise time, settling time, max overshoot, etc.). Then the AVR system responses with a PID controller based on different optimization techniques are compared to find out which is the best technique.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 3; 567-583
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimal algorithms for seeking the minimum
    Autorzy:
    Adamski, A.
    Korytowski, A.
    Mitkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/747469.pdf
    Data publikacji:
    1977
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Mathematical programming methods, Numerical analysis, Mathematical programming, optimization and variational techniques
    Opis:
    .
    The definition of the optimality of an algorithm is modified so that the optimal algorithm satisfies Bellman's principle. The search for a minimum using this technique is compared with J. Kiefer's algorithm
    Źródło:
    Mathematica Applicanda; 1977, 5, 11
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New biomimetic approach to the aircraft wing structural design based on aeroelastic analysis
    Autorzy:
    Gawel, D.
    Nowak, M.
    Hausa, H.
    Roszak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/199862.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optimization
    fluid-structure interaction
    coupling techniques
    biomimetics
    optymalizacja
    sprzęganie
    biomimetyka
    Opis:
    This paper presents a new biomimetic approach to the structural design. For the purpose of aircraft wing design the numerical environment combining simultaneous structural size, shape, and topology optimization based on aeroelastic analysis was developed. For the design of aircraft elements the optimization process must be treated as a multi-load case task, because during the fluid structure interaction analysis each step represents a different structural load case. Also, considering different angles of attack, during the CFD computation each result is considered. The method-specific features (such as domain independence, functional configurations during the process of optimization, and multiple load case solution implemented in the optimization scenario) enable the optimal structural form. To illustrate the algorithm functionality, the problem of determining the optimal internal wing structure was presented. The optimal internal wing structure resulting from aeroelastic computation with different angles of attack has been presented.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 5; 741-750
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Dual Hyperparameter Optimization on Software Vulnerability Prediction Models
    Autorzy:
    Bassi, Deepali
    Singh, Hardeep
    Powiązania:
    https://bibliotekanauki.pl/articles/2203949.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    software vulnerability
    hyperparameter optimization
    machine learning algorithm
    data balancing techniques
    data complexity measures
    Opis:
    Background: Prediction of software vulnerabilities is a major concern in the field of software security. Many researchers have worked to construct various software vulnerability prediction (SVP) models. The emerging machine learning domain aids in building effective SVP models. The employment of data balancing/resampling techniques and optimal hyperparameters can upgrade their performance. Previous research studies have shown the impact of hyperparameter optimization (HPO) on machine learning algorithms and data balancing techniques. Aim: The current study aims to analyze the impact of dual hyperparameter optimization on metrics-based SVP models. Method: This paper has proposed the methodology using the python framework Optuna that optimizes the hyperparameters for both machine learners and data balancing techniques. For the experimentation purpose, we have compared six combinations of five machine learners and five resampling techniques considering default parameters and optimized hyperparameters. Results: Additionally, the Wilcoxon signed-rank test with the Bonferroni correction method was implied, and observed that dual HPO performs better than HPO on learners and HPO on data balancers. Furthermore, the paper has assessed the impact of data complexity measures and concludes that HPO does not improve the performance of those datasets that exhibit high overlap. Conclusion: The experimental analysis unveils that dual HPO is 64% effective in enhancing the productivity of SVP models.
    Źródło:
    e-Informatica Software Engineering Journal; 2023, 17, 1; art. no. 230102
    1897-7979
    Pojawia się w:
    e-Informatica Software Engineering Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Similarity of different lifting techniques in trunk muscular synergies
    Autorzy:
    Mirakhorlo, M.
    Azghani, M. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/306737.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    mięśnie
    synergia
    optymalizacja
    dynamika odwrotna
    trunk muscle synergies
    lifting techniques
    optimization
    inverse dynamics
    Opis:
    Lifting is known to be a major reason for musculoskeletal injuries. In this way, lifting has a crucial effect on human musculoskeletal system and intensity of this impact depends slightly on the selection of techniques. Underlying mechanisms by which trunk muscles are executed during performing lifting are central to biomechanical study of lifting techniques. In the current study, the trunk muscular control mechanisms of lifting are investigated using the synergetic control analysis. Non-negative matrix factorization has been used to extract trunk muscles synergies from their activities – which are computed by a previously validated musculoskeletal model – during different lifting techniques aimed to investigate motor control strategies. Three lifting techniques are considered; stoop, squat and semi-squat. Three synergies account for variety among muscle activation of trunk muscles with related VAF (Variability Account For) of over 95%. Trunk muscle synergy weightings and related time-varying coefficients are calculated for each kind of lifting techniques considering three synergies. Paired correlation coefficients between muscle synergies are all greater than 0.91 (P < 0.05) suggesting that trunk muscle synergies are similar for examined techniques in spite of their kinematic diversity. This similarity can be a result of their common ultimate goal. The acquired results also elucidate the mechanisms of muscle activation patterns that can be exploited in future studies and ergonomic interventions.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2015, 17, 4; 21-29
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Performance optimization of model-free fault diagnosis schemes
    Optymalizacja sprawności schematów diagnostycznych bez wsparcia modelowego
    Autorzy:
    Kalisch, M.
    Przystałka, P.
    Katunin, A.
    Timofiejczuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/327736.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    fault detection
    fault isolation
    evolutionary optimization
    data mining techniques
    wavelet analysis
    wind turbine system
    detekcja uszkodzeń
    izolacja uszkodzeń
    optymalizacja ewolucyjna
    techniki eksploracji danych
    analiza falkowa
    turbina wiatrowa
    Opis:
    This paper describes the method of model-free fault detection and isolation. The main purpose of the research is to present one possibility of the development of diagnostic schemes for which the component structure and behavioural parameters are tuned automatically in order to obtain the maximal efficiency of the fault detection and isolation system. The proposed approach can be viewed as the intersection of elementary methods (classic and soft computing) such as discrete wavelet analysis, machine learning (using decision trees or artificial neural networks), and evolutionary algorithms. The fundamental verification of the method was conducted for data made available within the benchmark problem involving a wind turbine. The achieved results confirm the effectiveness of the proposed approach while also showing its limitations.
    Artykuł opisuje metodę detekcji i izolacji uszkodzeń bez użycia modelu. Głównym celem badań jest pokazanie możliwości opracowania schematów diagnostycznych, których struktura oraz parametry są dostrajane automatycznie w celu osiągnięcia najwyższej możliwej sprawności detekcji i izolacji uszkodzeń. Zaproponowane podejście może być postrzegane jako połączenie elementarnych metod (klasyczne metody oraz obliczenia miękkie) jak np. analiza falkowa, metody uczenia maszynowego (drzewa decyzyjne i sztuczne sieci neuronowe) oraz algorytmy ewolucyjne. Weryfikacja metody została przeprowadzona na danych symulacyjnych wygenerowanych za pomocą modelu turbiny wiatrowej. Uzyskane wyniki potwierdziły wysoką skuteczność metody oraz pokazały jej ograniczenia.
    Źródło:
    Diagnostyka; 2016, 17, 1; 51-58
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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