Temat: maximum entropy - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Mathematical Foundations of Cognitive Radios
Autorzy:: Couillet, R.
Debbah, M.
Tematy:: Bayesian inference
cognitive radio
maximum entropy; Pokaż więcej
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Powiązania:: https://bibliotekanauki.pl/articles/308175.pdf Link otwiera się w nowym oknie
Opis:: Recently, much interest has been directed towards software defined radios and embedded intelligence in telecommunication devices. However, no fundamental basis for cognitive radios has ever been proposed. In this paper, we introduce a fundamental vision of cognitive radios from a physical layer viewpoint. Specifically, our motivation in this work is to embed human-like intelligence in mobile wireless devices, following the three century-old work on Bayesian probability theory, the maximum entropy principle and minimal probability update. This allows us to partially answer such questions as, what are the signal detection capabilities of a wireless device, when facing a situation in which most parameters are missing, how to react and so on. As an introductory example, we will present previous works from the same authors following the cognitive framework, and especially the multi-antenna channel modeling and signal sensing.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The maximum entropy method in the analysis of the Mössbauer spectra
Autorzy:: Dobrzyński, L.
Szymański, K.
Satuła, D.
Tematy:: Bayesian logic
maximum entropy method
Mössbauer spectra; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/147136.pdf Link otwiera się w nowym oknie
Opis:: The paper shows the possibility of reconstruction of the distribution of hyperfine field parameters without prior assumptions concerning correlations between parameters. The method used is the maximum entropy method and the distributions considered concern the magnetic field and isomer shift. The results obtained are very encouraging and show the feasibility of the proposed method.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Principle of Maximum Entropy
Zasada maksymalnej entropii
Autorzy:: Leśniak, Judyta
Opis:: The purpose of this M.A. thesis was to introduce the concept of entropy and then show the Principle of Maximum Entropy as the bestway to obtain the probability distribution subject to given constrains.This composition was split into four chapters.The first chapter explains the concept of entropy and justifies its definition.Then we can find examples that will help us understand the meaning of entropyin discreet and continuous case. The second chapter concerns The principle of Maximum Entropy and shows thatthere exist only one solution when the assumptions are fulfilled.The main probability distributions are examined from this point of view and the resultsare summarized in a table. Then there are examples that tell us the PME can have many solutions.The third chapter contains example of application of PME in thermodynamics.The fourth chapter is the last one, gives us theorems and properties that was used inprevious chapters.
Celem niniejszej pracy magisterskiej było wprowadzenie pojęciaentropii a następnie przedstawienie Zasady Maksymalnej Entropiijako zasady pozwalającej na znalezienie rozkładu prawdopodobieństwanajlepiej pasującego do zadanych ograniczeń.Praca została podzielona na cztery rozdziały.Rozdział pierwszy wyjaśnia pojęcie entropii, uzasadnia definicjęoraz podaje przykłady pomocne w rozumieniu rozważanych pojęćw przypadku dyskretnym i ciągłym.Rozdział drugi dotyczy Zasady Maksymalnej Entropii (ZME). Pokazuj istnienierozwiązania i jego jedyność przy danych założeniach. Przedstawiacharakteryzację znanych rozkładów prawdopodobieństwa za pomocą wpomnianej zasady. Również podaje przykład, że ZMEmoże posiadać nieskończenie wiele rozwiązań.Rozdział trzeci podaje przykład zastosowania ZME w termodynamice.Rozdział czwarty zawiera twierdzenia i własności wykorzystane wpoprzednich rozdziałach.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 4.

Tytuł:: Assessing Potential Distributions of Bird Endemic Species: Case Studies of Macrocephalon maleo and Rhyticeros cassidix and Their Threats
Autorzy:: Aldiansyah, Septianto
Risna, Risna
Saputra, Randi Adrian
Tematy:: potential distribution
Macrocephalon maleo
Rhyticeros cassidix
forest fire
maximum entropy; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/58810053.pdf Link otwiera się w nowym oknie
Opis:: Maleo and knobbed hornbill are bird species that are endemic on the island of Sulawesi, which is highly threatened by forest fires. Fires tend to destroy any affected species; however, it is not possible to survey the entire range of the original distribution of the two endemic bird species that are affected by forest fires due to practical constraints. Species distribution modeling using maximum entropy is considered to be an alternative to understanding the potential distribution area of species against the threat of forest fires. The prediction model from MaxEnt all have AUC values of greater than 0.70, which means that the model is good enough to classify the records of the presence of M. maleo and R. cassidix along with the past forest fires. The environmental variables that affect the distribution of M. maleo are its distance from hot water, rivers, and roads, while the distribution of R. cassidix is strongly influenced by its distance from roads, settlements, and rivers. Forest fire distribution is mostly influenced by soil type, land-use land cover, and rainfall. It is predicted that around 238,690 and 677,070 ha of the potential distribution of M. maleo and R. cassidix, respectively, are potentially disturbed and affected by forest fires. However, this number much greater outside conservation areas. The results of this study can be used by the government of the Republic of Indonesia (especially the Ministry of Environment and Forestry) for determining conservation actions for both species in the future.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Maximum entropy generation rate in a heat exchanger at constant inlet parameters
Autorzy:: Laskowski, R.
Jaworski, M.
Tematy:: maximum entropy generation rate
entropy
heat exchanger
maksymalna szybkość generowania entropii
entropia
wymiennik ciepła; Pokaż więcej
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Powiązania:: https://bibliotekanauki.pl/articles/95303.pdf Link otwiera się w nowym oknie
Opis:: The main goal of the paper is to provide a condition for which a maximum entropy generation occurs in a heat exchanger at constant inlet parameters (temperatures and mass flow rates). Knowing this condition is essential during the design of the heat exchanger as it allows designers to avoid one of its most unfavourable operating conditions in terms of thermodynamics. Entropy generation resulting from the resistance of heat-transferring fluids to flow was not taken into account. Entropy generation was analysed as a function of a heat flow rate at constant parameters at the inlet of a condenser and a counter-flow double-pipe heat exchanger. The analysis showed that for the condenser the entropy generation rate increases with the increase in the heat flow rate. The maximum entropy generation rate occurs for the maximum flow rate of the heat that can be transferred according to the definition of heat transfer effectiveness. For the counter-flow heat exchanger, the entropy generation as a function of the heat flow rate reaches maximum at constant inlet parameters (temperatures and mass flow rates). It appeared that the peak entropy generation, or the largest exergy loss, occurs when the outlet temperatures of the fluids are equal. This assertion was verified against data obtained from a simulator of the counter-flow heat exchanger for two different relations between heat capacity rates.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: 3D morphological reconstruction of the red blood cell based on two phase images
Autorzy:: Wang, Y
Li, Z
Ji, Y
Xu, Y
Bu, M
Tematy:: phase imaging
red blood cell
3D morphological reconstruction
maximum entropy; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/174332.pdf Link otwiera się w nowym oknie
Opis:: As an important component of blood cells, the red blood cell plays a vital role in many diseases such as malaria and so on. Although quantitative phase imaging techniques can be used for homogeneous cellular thickness distribution to obtain ideal results, they cannot achieve 3D morphological distribution. In this paper, a new method is presented to get a 3D morphology image of red blood cell. With this method, only two cellular quantitative phase images obtained from two orthogonal directions are needed as original information. By using the grid method, the sample is divided into many small phase cubes, and then we take a layer’s cubes into calculation so that the 3D problem could be transformed into a 2D problem to elaborate. Then it can be applied to the tomographic imaging combined with the maximum entropy method according to the two orthogonal phase images. This method has been proved by a simulation of red blood cell. The results show that cellular morphological distribution can be achieved in detail very well just based on only two orthogonal phase images.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Metoda analizy niepewności oparta na połączeniu zasady maksymalnej entropii i metody oceny punktowej
Uncertainty analysis method based on a combination of the maximum entropy principle and the point estimation metod
Autorzy:: Zhang, X. L.
Huang, H. Z.
Wang, Z. L.
Xiao, N. C.
Li, Y. F.
Tematy:: analiza niepewności
bootstrapping
momenty
zasada maksymalnej entropii
uncertainty analysis
moments
maximum entropy principle; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Powiązania:: https://bibliotekanauki.pl/articles/301597.pdf Link otwiera się w nowym oknie
Opis:: Niepewność jest nieodłącznym elementem procesów projektowania produktu. Dlatego też podejmowanie niezawodnych decyzji wymaga analizy niepewności, która uwzględniałaby wszystkie rodzaje niepewności. W praktyce inżynierskiej, z powodu niepełnej wiedzy, wyznaczenie rozkładu niektórych zmiennych projektowych nie jest możliwe. Co więcej, funkcja stanu granicznego jest wysoce nieliniowa, co sprawia, że do poprawnego obliczenia prawdopodobieństwa uszkodzenia potrzebna jest znajomość momentów wyższych rzędów tej funkcji. W niniejszej pracy zaproponowano metodę analizy niepewności łączącą zasadę maksymalnej entropii z metodą bootstrapową. W pierwszej części pracy wykorzystano metodę bootstrapową do obliczenia przedziałów ufności czterech pierwszych momentów dla zmiennych losowych typu mieszanego oraz zmiennych z próby. Następnie, wyznaczono momenty wyższych rzędów funkcji stanu granicznego przy użyciu metody redukcji wymiarów. Po trzecie, w celu obliczenia funkcji gęstości prawdopodobieństwa (PDF) oraz dystrybuanty (CDF) funkcji stanu granicznego, sformułowano model optymalizacji oparty na zasadzie maksymalnej entropii. Proponowana metoda nie wymaga założenia znajomości rozkładów zmiennych losowych ani obliczania wrażliwości dla funkcji stanu granicznego w odniesieniu do najbardziej prawdopodobnego punktu awarii. W końcowej części artykułu porównano na podstawie przykładów numerycznych wyniki otrzymane za pomocą proponowanej metody oraz symulacji Monte Carlo (MCS).
Uncertainty is inevitable in product design processes. Therefore, to make reliable decisions, uncertainty analysis incorporating all kinds of uncertainty is needed. In engineering practice, due to the incomplete knowledge, the distribution of some design variables can not be determined. Furthermore, the performance function is highly nonlinear, therefore, the high order moments of the performance function are needed to calculate the probability of failure accurately. In this paper, an uncertainty analysis method combining the maximum entropy principle and the bootstrapping method is proposed. Firstly, the bootstrapping method is used to calculate the confidence intervals of the first four moments for mixed random variables and sample variables. Secondly, the high order moments of limit state functions are estimated using the reduced dimension method. Thirdly, to calculate the probability density function (PDF) and cumulative distribution function (CDF) of the limit state functions, an optimization model based on the maximum entropy principle is formulated. In the proposed method, the assumptions that the distribution of the random variables are known and the calculation of the sensitivity for limit state function with respect to the Most Probable Point (MPP) are avoided. Finally, comparisons of results from the proposed methods and the MCS method are presented and discussed with numerical examples.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Assessing differences in connectivity based on habitat versus movement models for brown bears in the Carpathians
Autorzy:: Ziółkowska, Elżbieta
Radeloff, Volker C.
Zwijacz-Kozica, Tomasz
Śmietana, Wojciech
Zięba, Filip
Kuemmerle, Tobias
Selva, Nuria
Sergiel, Agnieszka
Ostapowicz, Katarzyna
Opis:: Context. Connectivity assessments typically rely on resistance surfaces derived from habitat models, assuming that higher-quality habitat facilitates movement. This assumption remains largely untested though, and it is unlikely that the same environmental factors determine both animal movements and habitat selection, potentially biasing connectivity assessments. Objectives. We evaluated how much connectivity assessments differ when based on resistance surfaces from habitat versus movement models. In addition, we tested how sensitive connectivity assessments are with respect to the parameterization of the movement models. Methods. We parameterized maximum entropy models to predict habitat suitability, and step selection functions to derive movement models for brown bear (Ursus arctos) in the northeastern Carpathians. We compared spatial patterns and distributions of resistance values derived from those models, and locations and characteristics of potential movement corridors. Results. Brown bears preferred areas with high forest cover, close to forest edges, high topographic complexity, and with low human pressure in both habitat and movement models. However, resistance surfaces derived from the habitat models based on predictors measured at broad and medium scales tended to underestimate connectivity, as they predicted substantially higher resistance values for most of the study area, including corridors. Conclusions. Our findings highlighted that connectivity assessments should be based on movement information if available, rather than generic habitat models. However, the parameterization of movement models is important, because the type of movement events considered, and the sampling method of environmental covariates can greatly affect connectivity assessments, and hence the predicted corridors.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 9.

Tytuł:: Named-entity recognition for Hindi language using context pattern-based maximum entropy
Autorzy:: Jain, Arti
Yadav, Divakar
Arora, Anuja
Tayal, Devendra K.
Tematy:: context patterns
gazetteer lists
Hindi language
Kaggle dataset
maximum entropy
named-entity recognition
feature extension; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/27312839.pdf Link otwiera się w nowym oknie
Opis:: This paper describes a named-entity-recognition (NER) system for the Hindi language that uses two methodologies: an existing baseline maximum entropy-based named-entity (BL-MENE) model, and the proposed context pattern-based MENE (CP-MENE) framework. BL-MENE utilizes several baseline features for the NER task but suffers from inaccurate named-entity (NE) boundary detection, misclassification errors, and the partial recognition of NEs due to certain missing essentials. However, the CP-MENE-based NER task incorporates extensive features and patterns that are set to overcome these problems. In fact, CP-MENE’s features include right-boundary, left-boundary, part-of-speech, synonym, gazetteer and relative pronoun features. CP-MENE formulates a kind of recursive relationship for extracting highly ranked NE patterns that are generated through regular expressions via Python@ code. Since the web content of the Hindi language is arising nowadays (especially in health care applications), this work is conducted on the Hindi health data (HHD) corpus (which is readily available from the Kaggle dataset). Our experiments were conducted on four NE categories; namely, Person (PER), Disease (DIS), Consumable (CNS), and Symptom (SMP).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Entropic representation in the theory of molecular electronic structure
Autorzy:: Nalewajski, Roman
Opis:: The entropic perspective on the molecular electronic structure is investigated. Information-theoretic description of electron probabilities is extended to cover thecomplexamplitudes(wavefunctions)ofquantummechanics.This analysis emphasizes the entropic concepts due to the phase part of electronic states, which generates the probability currentdensity, thus allowing one to distinguish the information content of states generating the same electron density and differing in their current densities. The classical information measures of Fisher and Shannon, due to the probability/density distributions themselves, are supplemented by the nonclassical terms generated by the wave-function phase or the associated probability current. A complementary character of the Fisher and Shannon information measures is explored and the relationship between these classical information densities is derived. It is postulated to characterize also their nonclassical (phase/current-dependent) contributions. The continuity equations of the generalized information densities are examined and the associated nonclassical information sources are identified. The variational rules involving the quantum-generalized Shannon entropy, which generate the stationary and time-dependent Schrödinger equations from the relevant maximum entropy principles, are discussed and their implications for the system “thermodynamic” equilibrium states are examined. It is demonstrated that the lowest, stationary “thermodynamic” state differs from the true ground state of the system, by exhibiting the space-dependent phase, linked to the modulus part of the wave function, and hence also a nonvanishing probability current.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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