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Letteratura scientifica selezionata sul tema "Hill function"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Hill function"

Sun, Menghan, e Hui Qi. "Scattering of Antiplane SH Waves by Complex Landforms". Shock and Vibration 2021 (5 agosto 2021): 1–21. http://dx.doi.org/10.1155/2021/9997230.

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The multiple scattering of SH waves by isosceles triangular hill, semicircle depression, and isosceles trapezoidal hill in the solid half-space is studied. The complex model is divided into multiple subdomains by using the region matching method, then the wave functions in each subdomain are constructed by using the fractional-order Bessel function, and finally, the infinite algebraic equations for solving the unknown coefficients in the wave function are established by using the multipolar coordinate technique and the complex function method according to the boundary conditions. Fourier series is used to solve the unknown undetermined coefficients. The results show that due to the multiple reflections of the incident wave between complex landforms, surface displacement amplitude is affected by the incident angle, incident frequency, and the distance between the isosceles triangular hill, semicircle depression, and isosceles trapezoidal hill. It is found that when the incident frequency increases, there is a certain amplification effect between the hills and the depression. When the wave is incident horizontally, there is a certain “barrier” effect between hills and depression, and when the distance between the hills and depression reaches a certain level, the “barrier” effect will reach a stable value.

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Liu, Hu e Wang. "Large Eddy Simulations of the Flow Fields over Simplified Hills with Different Roughness Conditions, Slopes, and Hill Shapes: A Systematical Study". Energies 12, n. 18 (4 settembre 2019): 3413. http://dx.doi.org/10.3390/en12183413.

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Turbulent flow fields over topographies are important in the area of wind energy. The roughness, slope, and shape of a hill are important parameters affecting the flow fields over topographies. However, these effects are always examined separately. The systematic investigations of these effects are limited, the coupling between these effects is still unrevealed, and the turbulence structures as a function of these effects are still unclear. Therefore, in the present study, the flow fields over twelve simplified isolated hills with different roughness conditions, slopes, and hill shapes are examined using large eddy simulations. The mean velocities, velocity fluctuations, fractional speed-up ratios, and visualizations of the turbulent flow fields are presented. It is found that as the hill slope increases, the roughness effects become weaker, and the roughness effects will further weaken as the hill changes from 3D to 2D. In addition, the fractional speed-up ratio at the summit of rough hills can even reach to three times as large as that over the corresponding smooth hills. Furthermore, the underestimation of the ratios of spanwise fluctuation to the streamwise fluctuation by International Electrotechnical Commission (IEC) 61400-1 is quite obvious when the hill shape is 3D. Finally, coherent turbulence structures can be identified for smooth hills, and as the hill slope increases, the coherent turbulence structures will experience clear evolutions. After introducing the ground roughness, the coherent turbulence structures break into small eddies.

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Yang, Rui, Ting Ting Wang e Wei Wei Xia. "Research of Influence of Obstacles on Three-Dimensional Hill Wind Field". Applied Mechanics and Materials 448-453 (ottobre 2013): 1712–15. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.1712.

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At different wind speeds, in order to study the impact of obstacle size and distance to the bottom of the hill on wind farm, using Pro / E generates the model of hills and upstream obstacle, sinusoidal model was selected to the hill contour, then Fluent was adopted to analyze the flow field, turbulence model select the SSK k-ω, inlet boundary condition was exponential function. Wind speed distribution and wind pressure distribution of hill surface at each case were depicted by the simulation results; the obstacle of conducive for wind farms was obtained by comparing flow field distribution of each case.

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Gonze, Didier, e Wassim Abou-Jaoudé. "The Goodwin Model: Behind the Hill Function". PLoS ONE 8, n. 8 (1 agosto 2013): e69573. http://dx.doi.org/10.1371/journal.pone.0069573.

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Gulayeva, N. M., e S. A. Yaremko. "EXPERIMENTAL ANALYSIS OF MULTINATIONAL GENETIC ALGORITHM AND ITS MODIFICATIONS". Radio Electronics, Computer Science, Control, n. 2 (3 luglio 2021): 71–83. http://dx.doi.org/10.15588/1607-3274-2021-2-8.

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Context. Niching genetic algorithms are one of the most popular approaches to solve multimodal optimization problems. When classifying niching genetic algorithms it is possible to select algorithms explicitly analyzing topography of fitness function landscape; multinational genetic algorithm is one of the earliest examples of these algorithms. Objective. Development and analysis of the multinational genetic algorithm and its modifications to find all maxima of a multimodal function. Method. Experimental analysis of algorithms is carried out. Numerous runs of algorithms on well-known test problems are conducted and performance criteria are computed, namely, the percentage of convergence, real (global, local) and fake peak ratios; note that peak rations are computed only in case of algorithm convergence. Results. Software implementation of a multinational genetic algorithm has been developed and experimental tuning of its parameters has been carried out. Two modifications of hill-valley function used for determining the relative position of individuals have been proposed. Experimental analysis of the multinational genetic algorithm with classic hill-valley function and with its modifications has been carried out. Conclusions. The scientific novelty of the study is that hill-valley function modifications producing less number of wrong identifications of basins of attraction in comparison with classic hill-valley function are proposed. Using these modifications yields to performance improvements of the multinational genetic algorithm for a number of test functions; for other test functions improvement of the quality criteria is accompanied by the decrease of the convergence percentage. In general, the convergence percentage and the quality criterion values demonstrated by the algorithm studied are insufficient for practical use in comparison with other known algorithms. At the same time using modified hill-valley functions as a post-processing step for other niching algorithms seems to be a promising improvement of performance of these algorithms.

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LIKHOSHVAI, VITALI, e ALEXANDER RATUSHNY. "GENERALIZED HILL FUNCTION METHOD FOR MODELING MOLECULAR PROCESSES". Journal of Bioinformatics and Computational Biology 05, n. 02b (aprile 2007): 521–31. http://dx.doi.org/10.1142/s0219720007002837.

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Development of an in silico cell is an urgent task of systems biology. The core of this cell should consist of mathematical models of intracellular events, including enzymatic reactions and control of gene expression. For example, the minimal model of the E. coli cell should include description of about one thousand enzymatic reactions and regulation of expression of approximately the same number of genes. In many cases detailed mechanisms of molecular processes are not known. In this study, we propose a generalized Hill function method for modeling molecular events. The proposed approach is a method of kinetic data approximation in view of additional data on structure functional features of molecular genetic systems and actually does not demand knowledge of their detailed mechanisms. Generalized Hill function models of an enzymatic reaction catalyzed by the tryptophan-sensitive 3-deoxy-d-arabino-heptulosonate-7-phosphate synthase and the cydAB operon expression regulation are presented.

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Peng, Xing Qian, e Ling Lin Shi. "Analysis of Wind Load Effect on the Roof of Low-Rise Building in the Mountain Terrain". Advanced Materials Research 382 (novembre 2011): 176–82. http://dx.doi.org/10.4028/www.scientific.net/amr.382.176.

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The wind conditions of the low-rise building in the mountain terrain are different because they have the characteristics of different landforms. When the typhoon comes, the possibility of structural damage is increasing by the negative effects of wind in the special topography. By establishing a sine function of outline of the hill, this paper makes a CFD(Computational Fluid Dynamics) numerical simulation about the low-rise building around the hills with four different height. Using ANSYS-CFX software as calculating platform, it put forward the roof wind load effect of the Low-rise building by study the characteristics of the hill, the law of wind pressure distribution and the influence to roof wind load by wind direction and the high of the hill, the conclusions which can provide a reference for wind-resistant design have practical significance.

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Vaughan, Diane E., Sheldon H. Jacobson e Derek E. Armstrong. "A New Neighborhood Function for Discrete Manufacturing Process Design Optimization Using Generalized Hill Climbing Algorithms". Journal of Mechanical Design 122, n. 2 (1 marzo 2000): 164–71. http://dx.doi.org/10.1115/1.533566.

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Discrete manufacturing process design optimization can be difficult, due to the large number of manufacturing process design sequences and associated input parameter setting combinations that exist. Generalized hill climbing algorithms have been introduced to address such manufacturing design problems. Initial results with generalized hill climbing algorithms required the manufacturing process design sequence to be fixed, with the generalized hill climbing algorithm used to identify optimal input parameter settings. This paper introduces a new neighborhood function that allows generalized hill climbing algorithms to be used to also identify the optimal discrete manufacturing process design sequence among a set of valid design sequences. The neighborhood function uses a switch function for all the input parameters, hence allows the generalized hill climbing algorithm to simultaneously optimize over both the design sequences and the inputs parameters. Computational results are reported with an integrated blade rotor discrete manufacturing process design problem under study at the Materials Process Design Branch of the Air Force Research Laboratory, Wright Patterson Air Force Base (Dayton, Ohio, USA). [S1050-0472(00)01002-3]

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Pérez-Correa, José Ricardo, Gastón Lefranc e Mario Fernández-Fernández. "A New Application of the Hill Repressor Function: Automatic Control of a Conic Tank Level and Local Stability Analysis". Mathematical Problems in Engineering 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/271216.

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The Hill function is commonly used as a building block to model different dynamic patterns found in the response of genetic regulatory circuits within microorganisms and cells. These circuits are characterized by fast response and robustness against unmeasured disturbances. Therefore, microorganisms and cells can survive even if they are subjected to strong changes in their environment. However, as far as we know, the Hill function has not been used before to design process control systems. In this work, the repressor Hill function is applied to control the level of a conic tank. To eliminate the offset, we added integrative action. A local analysis was applied to define stability limits for the control parameters. A cost function that includes the error and the control effort was used to compare the performance of the Hill control against a standard PI and a PID-Dahlin controller.

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Resnick, Sidney, e Cătălin Stărică. "Smoothing the Hill Estimator". Advances in Applied Probability 29, n. 01 (marzo 1997): 271–93. http://dx.doi.org/10.1017/s0001867800027889.

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For sequences of i.i.d. random variables whose common tail 1 – F is regularly varying at infinity wtih an unknown index –α < 0, it is well known that the Hill estimator is consistent for α–1 and usually asymptotically normally distributed. However, because the Hill estimator is a function of k = k(n), the number of upper order statistics used and which is only subject to the conditions k →∞, k/n → 0, its use in practice is problematic since there are few reliable guidelines about how to choose k. The purpose of this paper is to make the use of the Hill estimator more reliable through an averaging technique which reduces the asymptotic variance. As a direct result the range in which the smoothed estimator varies as a function of k decreases and the successful use of the esimator is made less dependent on the choice of k. A tail empirical process approach is used to prove the weak convergence of a process closely related to the Hill estimator. The smoothed version of the Hill estimator is a functional of the tail empirical process.

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Tesi sul tema "Hill function"

Alison, John Michael. "A dielectric study of lossy materials over the frequency range four to eighty-two gigahertz". Thesis, King's College London (University of London), 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263831.

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Keith, Ryan H. "How Form and Function Create Community in the Middle Landscape". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/32794.

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The middle landscape, more commonly referred to as Suburbia, has become spatially discontinuous, lacking the cohesive union, open spaces and city centers that once defined community. Presently, the middle landscapeâ s community spaces do not offer the opportunity for familiar and chance encounters or ritual activity. Large-scale housing development in Northern Virginia and in the mid-Atlantic region is continually segregating and ultimately destroying community and all links to the areaâ s history. Located in Southern Fairfax County, the newly abandoned Lorton Central and Maximum Security Prison Facility provides an opportunity to serve as a catalyst for community in this area. This thesis investigates the historic precedence for creating successful community centers. The authorâ s personal investigation is focused upon using form and function to accomplish this vision. By adaptively reusing the existing architecture alongside new construction, the intent is to create a dense urban town center at the abandoned historic site.
Master of Landscape Architecture

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Astré, Gustav, e Joakim Edman. "Development and Implementation of Drive Away Release Function for a Vehicle". Thesis, Linköpings universitet, Fordonssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166237.

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As autonomy increases in today’s vehicles, the demands increase on both safety and comfort functions. Vehicle Hold, which holds the vehicle stationary without requiring the driver to press the brake pedal, is an example of such as function. This thesis aims to develop a concept for a Drive Away Release from this hold state, following several requirements regarding such as rollback, comfort, manual and autonomous drive mode, driving direction, road inclinations, with or without a trailer, and following the safety standard ISO 26262. In order to develop the concept function, a study of the state-of-the-art was made, followed by modeling the dynamics and control. The control algorithm was validated and tested first by running co-simulations between Matlab/Simulink and CarMaker. It was then implemented in a test vehicle. The test vehicle did not have all systems which are usually provided, demanding estimations to be made, such as the road inclination and vehicle mass. For manual drive mode, the driver controls the propulsion torque, and the control algorithm is based on releasing the brakes depending on estimations of the gravitational and propulsion torques. For autonomous drive mode, the vehicle is supposed to follow an acceleration reference. The control algorithm for autonomous drive mode is then extended with two feedforward compensators, one from reference and one from the gravitational torque, which is regarded as a disturbance, and with a feedback PI controller. To ensure that rollback do not occur at drive away release, a rollback prevention safety feature was also developed. The results of both the simulations and the test drives show that the concept function provides comfortable drive-off for most inclinations, drive modes and directions, without causing an undesired rollback

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Guo, Ruijian [Verfasser], Klaus [Gutachter] Reinhardt e Geoffery E. [Gutachter] Hill. "Genetic and environmental components of sperm function in Drosophila melanogaster / Ruijian Guo ; Gutachter: Klaus Reinhardt, Geoffery E. Hill". Dresden : Technische Universität Dresden, 2020. http://d-nb.info/122694664X/34.

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Loukrati, Hicham. "Tail Empirical Processes: Limit Theorems and Bootstrap Techniques, with Applications to Risk Measures". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37594.

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Au cours des dernières années, des changements importants dans le domaine des assurances et des finances attirent de plus en plus l’attention sur la nécessité d’élaborer un cadre normalisé pour la mesure des risques. Récemment, il y a eu un intérêt croissant de la part des experts en assurance sur l’utilisation de l’espérance conditionnelle des pertes (CTE) parce qu’elle partage des propriétés considérées comme souhaitables et applicables dans diverses situations. En particulier, il répond aux exigences d’une mesure de risque “cohérente”, selon Artzner [2]. Cette thèse représente des contributions à l’inférence statistique en développant des outils, basés sur la convergence des intégrales fonctionnelles, pour l’estimation de la CTE qui présentent un intérêt considérable pour la science actuarielle. Tout d’abord, nous développons un outil permettant l’estimation de la moyenne conditionnelle E[X|X > x], ensuite nous construisons des estimateurs de la CTE, développons la théorie asymptotique nécessaire pour ces estimateurs, puis utilisons la théorie pour construire des intervalles de confiance. Pour la première fois, l’approche de bootstrap non paramétrique est explorée dans cette thèse en développant des nouveaux résultats applicables à la valeur à risque (VaR) et à la CTE. Des études de simulation illustrent la performance de la technique de bootstrap.

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Roser, Alexandra. "An Analysis of Including the Evolution Law for the Serial Element in the Musculoskeletal Modelling". Thesis, Linköpings universitet, Mekanik och hållfasthetslära, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-172282.

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In the classic Hill model for muscle contraction, the split between the muscle and tendon is arbitrary and the problem lacks a unique solution. Instead of reformulating the problem to a differential-algebraic equation and solving for a set of initial conditions, a constant tendon length is commonly assumed in musculoskeletal simulation tools. This assumption has not been thoroughly tested and introduces errors of unknown magnitude to the simulations. In this thesis, the contractile element of the Hill model is modelled as a friction clutch in parallel to a viscous damper. This provides an evolution law for the muscle length by which the muscle speed is numerically calculated taking into account a non-zero tendon speed. A simple biceps curl is simulated with the friction clutch model and compared to corresponding commercial musculoskeletal simulations. Overall, the results are similar, in particular for the muscle lengths which are almost identical in every simulation (0.00-0.42% difference). The difference in tendon speed is 0.00-3.26%, with upwards tendencies. In general, the error percentage of the tendon speed appears to decrease by the same amount that the contraction speed is reduced. Conclusively, it can be said that the introduced friction clutch model delivers comparative outcomes to a commercial musculoskeletal simulation software, while not assuming a constant tendon length. However, while presenting a relatively simple solution, an increased computation time is to be expected due to the need of a differential equation solver. Further investigation regarding implementation and computing times in more complex simulations may provide an alternative approach to conventional musculoskeletal simulations.

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Burnett, Linda Dee. "Heuristic Optimization of Boolean Functions and Substitution Boxes for Cryptography". Queensland University of Technology, 2005. http://eprints.qut.edu.au/16023/.

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Fundamental to the electronic security of information and communication systems, is the correct use and application of appropriate ciphers. The strength of these ciphers, particularly in their ability to resist cryptanalytic attacks, directly in uences the overall strength of the entire system. The strength of the underlying cipher is reliant upon a robust structure and the carefully designed interaction between components in its architecture. Most importantly, however, cipher strength is critically dependent on the strength of the individual components of which it is comprised. Boolean functions and substitution boxes (s-boxes) are among the most common and essential components of ciphers. This is because they are able to provide a cipher with strengthening properties to resist known and potential cryptanalytic attacks. Thus, it is not surprising that significant research effort has been made in trying to develop ways of obtaining boolean functions and substitution boxes with optimal achievable measures of desirable cryptographic properties. Three of the main cryptographic properties required by strong boolean functions and s-boxes are nonlinearity, correlation immunity and propagation criteria, with different cryptographic applications requiring different acceptable measures of these and other properties. As combinations of cryptographic properties exhibited by functions can be conicting, finding cryptographically strong functions often means that a trade-off needs to be made when optimizing property values. Throughout this thesis, the term "optimization" specifically refers to seeking to obtain the best achievable combination of target property values which may be exhibited by boolean functions and s-boxes, regardless of whether the relevant properties are conflicting or complementary. This thesis focusses on a particular class of techniques for obtaining strong functions for cryptographic applications, referred to as heuristic methods or, simply, heuristics. Three new heuristic methods, each aimed at generating boolean functions optimizing one or more of the main cryptographic properties mentioned above, in addition to other desirable properties, are presented. The first of the new heuristic methods developed for this thesis focusses on generating boolean functions which are balanced and exhibit very high nonlinearities. Highly nonlinear balanced functions are critical to many cryptographic applications, as they provide good resistance to linear cryptanalytic attacks. This first method is based on the recursive modification of a starting bent function and is shown to be highly successful and efficient at generating numerous such functions, which also exhibit low autocorrelation values, in a very short computational time. The generation of balanced, correlation immune boolean functions that also exhibit the confl icting property of high nonlinearity is the focus of the second new heuristic method developed for this thesis. By concatenating selected pairs of lower-dimensional boolean functions together in the Walsh Hadamard transform domain, direct optimization for both resilience and nonlinearity was able to take place at each level towards and for the final function. This second method was able to generate examples of boolean functions with almost all of the best known optimal combinations of target property values. Experiments have shown the success of this method in consistently generating highly nonlinear resilient boolean functions, for a range of orders of resilience, with such functions possessing optimal algebraic degree. A third new heuristic method, which searches for balanced boolean functions which satisfy a non-zero degree of propagation criteria and exhibit high nonlinearity, is presented. Intelligent bit manipulations in the truth table of starting functions, based on fundamental relationships between boolean function transforms and measures, provide the design rationale for this method. Two new function generation schemes have been proposed for this method, to efficiently satisfy the requirements placed on the starting functions utilized in the computational process. An optional process attempts to increase the algebraic degree of the resulting functions, without sacrificing the optimalities that are achievable. The validity of this method is demonstrated through the success of various experimental trials. Switching the focus from single output boolean functions to multiple output boolean functions (s-boxes), the effectiveness of existing heuristic techniques (namely Genetic Algorithm, Hill Climbing Method and combined Genetic Algorithm/Hill Climbing) in primarily being applied to improve the nonlinearity of s-boxes of various dimensions, is investigated. The prior success of these heuristic techniques for improving the nonlinearity of boolean functions has been previously demonstrated, as has the success of hill climbing in isolation when applied to bijective s-boxes. An extension to the bijective s-box optimization work is presented in this thesis. In this new research, a Genetic Algorithm, Hill Climbing Method and the two in combination are applied to the nonlinearity and autocorrelation optimization of regular NxM s-boxes (N > M) to investigate the effectiveness and efficiency of each of these heuristics. A new breeding scheme, utilized in the Genetic Algorithm and combined Genetic Algorithm/Hill Climbing trials, is also presented. The success of experimental results compared to random regular s-box generation is demonstrated. New research in applying the Hill Climbing Method to construct NxM sboxes (N > M) required to meet specific property criteria is presented. The consideration of the characteristics desired by the constructed s-boxes largely dictated the generation process. A discussion on the generation process of the component functions is included. Part of the results produced by experimental trials were incorporated into a commonly used family of stream ciphers, thus further supporting the use of heuristic techniques as a useful means of obtaining strong functions suitable for incorporation into practical ciphers. An analysis of the cryptographic properties of the s-box used in the MARS block cipher, the method of generation and the computational time taken to obtain this s-box, led to the new research reported in this thesis on the generation of MARS-like s-boxes. It is shown that the application of the Hill Climbing Method, with suitable requirements placed on the component boolean functions, was able to generate multiple MARS-like s-boxes which satisfied the MARS sbox requirements and provided additional properties. This new work represented an alternative approach to the generation of s-boxes satisfying the MARS sbox property requirements but which are cryptographically superior and can be obtained in a fraction of the time than that which was taken to produce the MARS s-box. An example MARS-like s-box is presented in this thesis. The overall value of heuristic methods in generating strong boolean functions and substitution boxes is clearly demonstrated in this thesis. This thesis has made several significant contributions to the field, both in the development of new, specialized heuristic methods capable of generating strong boolean functions, and in the analysis and optimization of substitution boxes, the latter achieved through applying existing heuristic techniques.

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Xie, Zhi. "Modelling genetic regulatory networks: a new model for circadian rhythms in Drosophila and investigation of genetic noise in a viral infection process". Phd thesis, Lincoln University. Agriculture and Life Sciences Division, 2007. http://theses.lincoln.ac.nz/public/adt-NZLIU20070712.144258/.

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In spite of remarkable progress in molecular biology, our understanding of the dynamics and functions of intra- and inter-cellular biological networks has been hampered by their complexity. Kinetics modelling, an important type of mathematical modelling, provides a rigorous and reliable way to reveal the complexity of biological networks. In this thesis, two genetic regulatory networks have been investigated via kinetic models. In the first part of the study, a model is developed to represent the transcriptional regulatory network essential for the circadian rhythms in Drosophila. The model incorporates the transcriptional feedback loops revealed so far in the network of the circadian clock (PER/TIM and VRI/PDP1 loops). Conventional Hill functions are not used to describe the regulation of genes, instead the explicit reactions of binding and unbinding processes of transcription factors to promoters are modelled. The model is described by a set of ordinary differential equations and the parameters are estimated from the in vitro experimental data of the clocks components. The simulation results show that the model reproduces sustained circadian oscillations in mRNA and protein concentrations that are in agreement with experimental observations. It also simulates the entrainment by light-dark cycles, the disappearance of the rhythmicity in constant light and the shape of phase response curves resembling that of experimental results. The model is robust over a wide range of parameter variations. In addition, the simulated E-box mutation, perS and perL mutants are similar to that observed in the experiments. The deficiency between the simulated mRNA levels and experimental observations in per01, tim01 and clkJrk mutants suggests some differences in the model from reality. Finally, a possible function of VRI/PDP1 loops is proposed to increase the robustness of the clock. In the second part of the study, the sources of intrinsic noise and the influence of extrinsic noise are investigated on an intracellular viral infection system. The contribution of the intrinsic noise from each reaction is measured by means of a special form of stochastic differential equation, the chemical Langevin equation. The intrinsic noise of the system is the linear sum of the noise in each of the reactions. The intrinsic noise arises mainly from the degradation of mRNA and the transcription processes. Then, the effects of extrinsic noise are studied by means of a general form of stochastic differential equation. It is found that the noise of the viral components grows logarithmically with increasing noise intensities. The system is most susceptible to noise in the virus assembly process. A high level of noise in this process can even inhibit the replication of the viruses. In summary, the success of this thesis demonstrates the usefulness of models for interpreting experimental data, developing hypotheses, as well as for understanding the design principles of genetic regulatory networks.

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Malík, Lukáš. "HIL model elektromechanického systému". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376959.

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This diploma thesis deals with creation of elektromechanical model in Modelica language which is subsequently imported into LabVIEW environment. The Modelica language, LabVIEW graphical programming tool and Functional Mock-up Interface 2.0 standard are described in the introduction of this thesis. Functional Mock-up Interface is a tool independent standard witch, defines a standardized interface to ModelExchange and Co-simulation of complex system components. The model of electromechanical system was created based on Functional Mock-up Interface standard. Part of the work focuses on the Functional Mock-up Unit storage possibilities and LabVIEW support to import models of this type. The imported model was simulated and tested in this environment. Finally, the instance of Functional Mock-up Unit was connected with LabVIEW FPGA target for the purpose of model HIL simulation on CompactRIO platform.

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Hashemzadeh, Nayeri Mohit. "Cylinder-by-Cylinder Torque Model of an SI-Engine for Real-Time Applications". Thesis, Linköping University, Department of Electrical Engineering, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5396.

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In recent years Hardware-in-the-Loop HiL, has gained more and more

popularity within the vehicle industry. This is a more cost effective research alternative, as opposed to the tests done the traditional way, since in HiL testing the idea is to test the hardware of interest, such as an electronic control unit, in a simulated (or partially simulated) environment which closely resembles the real-world environment.

This thesis is ordered by Daimler Chrysler AG and the objective of this thesis is the developing of a cylinder-by-cylinder model for the purpose of emulation of misfire in a four-stroke SI-engine. This purpose does not demand a precise modelling of the cylinder pressure but rather an adequate modelling of position and amplitude of the torque produced by each cylinder. The model should be preferebly computaionally tractable so it can be run on-line. Therefore, simplifications are made such as assuming the rule of a homogenous mixture, pressure and temperature inside the cylinder at all steps, so the pressure model can be analytical and able to cope with the real-time demand of the HiL. The model is implemented in Simulink and simulated with different sample rates and an improvement is to be seen as the sample rate is decreased.

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Più fonti

Libri sul tema "Hill function"

Bosworth, Koren. Delineation and function rating of jurisdictional wetlands on CBJ parcels in the Industrial Blvd. and HIll 560 areas, Juneau, Alaska. Juneau, Alaska]: City and Borough of Juneau, Alaska, 2010.

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Vincent, Brooke Elin. Function and use of a nineteenth-century barn: "Walnut Hill" estate, Pawling Road, Lower Providence Township, Montgomery County, Pennsylvania. 1991.

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McGraw-Hill Ryerson calculus & advanced functions. Toronto: McGraw-Hill Ryerson, 2002.

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1947-, Dearling Chris, a cura di. McGraw-Hill Ryerson calculus & advanced functions. Whitby, Ont: McGraw-Hill Ryerson, 2002.

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Moralee, Jason. Climbing the Capitoline Hill. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190492274.003.0002.

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Chapter 1 introduces the transformations of the traditional uses of the hill from the third to the sixth century, in particular when emperors climbed the Capitoline Hill, when they chose not to do so, and the dynamics that eventually led to the abandonment of the Capitoline Hill. By the end of the fourth century, Christian rulers and administrators began to treat Rome as pilgrims did, thus terminating processions not at the Capitoline Hill, as they had in the past, but instead at St. Peter’s, the Lateran Palace, or the Forum of Trajan. Far from signaling the end of the hill’s history, the absence from the hill of emperors and their ritual power lifts the hill from the shadow of late Roman high politics and allows us to see how the hill functioned in other ways.

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Payne, Mark. Flowers of Time. Princeton University Press, 2020. http://dx.doi.org/10.23943/princeton/9780691205946.001.0001.

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The literary lineage of postapocalyptic fiction — stories set after civilization's destruction — is a long one, spanning the biblical tale of Noah and Hesiod's Works and Days to the works of Mary Shelley, Octavia Butler, Cormac McCarthy, and many others. Traveling from antiquity to the present, this book reveals how postapocalyptic fiction differs from other genres — pastoral poetry, science fiction, and the maroon narrative — that also explore human capabilities beyond the constraints of civilization. The book places postapocalyptic fiction into conversation with such theorists as Aristotle, Jean-Jacques Rousseau, Claude Lévi-Strauss, and Carl Schmitt, illustrating how the genre functions as political theory in fictional form. It shows that rather than argue for a particular way of life, postapocalyptic literature reveals what it would be like to inhabit that life. It considers the genre's appeal in our own historical moment, contending that this fiction is the pastoral of our time. Whereas the pastoralist and the maroon could escape to real-world hills and fashion their own versions of freedom, on a fully owned and occupied Earth, only an apocalyptic event can create a space where such freedoms are feasible once again. The book looks at how fictional narratives set after the world's devastation represent new conditions and possibilities for life and humanity.

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United States. General Accounting Office, a cura di. Interstate Commerce Commission: Budget and other impacts of eliminating or transferring functions : statement of Barry T. Hill, Associate Director, Transportation Issues, Resources, Community, and Economic Development Division, before the Subcommittee on Railroads, Committee on Transportation and Infrastructure, House of Representatives. Washington, D.C: The Office, 1995.

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United States. General Accounting Office, a cura di. Interstate Commerce Commission: Impacts of eliminating or transferring motor carrier and other functions : statement of Barry T. Hill, Associate Director, Transportation Issues, Resources, Community, and Economic Development Division, before the Subcommittee on Surface Transportation, Committee on Transportation and Infrastructure, House of Representatives. Washington, D.C: The Office, 1995.

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Capitoli di libri sul tema "Hill function"

Millan, William, Andrew Clark e Ed Dawson. "Boolean Function Design Using Hill Climbing Methods". In Information Security and Privacy, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48970-3_1.

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Brown, B. M., e K. M. Schmidt. "On the HELP Inequality for Hill Operators on Trees". In Spectral Theory, Function Spaces and Inequalities, 21–36. Basel: Springer Basel, 2011. http://dx.doi.org/10.1007/978-3-0348-0263-5_2.

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Liu, Sanrong, e Haifeng Wang. "Biological Network Modeling Based on Hill Function and Hybrid Evolutionary Algorithm". In Communications in Computer and Information Science, 186–94. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0121-0_15.

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Flå, Tor, Florian Rupp e Clemens Woywod. "Deterministic and Stochastic Dynamics of Chronic Myelogenous Leukaemia Stem Cells Subject to Hill-Function-Like Signaling". In Recent Trends in Dynamical Systems, 221–63. Basel: Springer Basel, 2013. http://dx.doi.org/10.1007/978-3-0348-0451-6_11.

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Brezis, Haim. "The Hille–Yosida Theorem". In Functional Analysis, Sobolev Spaces and Partial Differential Equations, 181–99. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-0-387-70914-7_7.

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Smajdor, Andrzej, e Wilhelmina Smajdor. "Entire Solutions of the Hille-Type Functional Equation". In Functional Equations and Inequalities, 249–58. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4341-7_20.

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deLaubenfels, Ralph. "C-resolvents and Hille-Yosida type theorems". In Existence Families, Functional Calculi and Evolution Equations, 104–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/bfb0073418.

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Madera, Julio, e Alberto Ochoa. "Evaluating the Max-Min Hill-Climbing Estimation of Distribution Algorithm on B-Functions". In Progress in Artificial Intelligence and Pattern Recognition, 26–33. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01132-1_3.

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Mundhenke, Florian. "Resourceful Frames and Sensory Functions – Musical Transformations from Game to Film in Silent Hill". In Music and Game, 107–24. Wiesbaden: Springer Fachmedien Wiesbaden, 2012. http://dx.doi.org/10.1007/978-3-531-18913-0_6.

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Seghier, Athmane, e Jianxin Li. "Parallel Steepest Ascent Hill-Climbing for High Nonlinear Boolean and Vectorial Boolean Functions (S-Boxes)". In Information and Communications Security, 413–29. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41579-2_24.

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Atti di convegni sul tema "Hill function"

Wang, Junnian, Deshun Liu e Helen Shang. "Hill Valley Function Based Niching Particle Swarm Optimization for Multimodal Functions". In 2009 International Conference on Artificial Intelligence and Computational Intelligence. IEEE, 2009. http://dx.doi.org/10.1109/aici.2009.250.

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Andrade Costa, B., e J. M. Lemos. "Neuromuscular blockade model identification based on the Hill function inversion". In Automation (MED 2010). IEEE, 2010. http://dx.doi.org/10.1109/med.2010.5547866.

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Bharti e Dheeraj Kumar Sharma. "Searching boolean function using simulated annealing and hill climbing optimization techniques". In 2016 International Conference on Advanced Communication Control and Computing Technologies (ICACCCT). IEEE, 2016. http://dx.doi.org/10.1109/icaccct.2016.7831601.

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Kim, Haseong, e Erol Gelenbe. "Stochastic gene expression modeling with hill function for switch-like gene responses". In 2010 IEEE International Conference on Bioinformatics and Biomedicine (BIBM). IEEE, 2010. http://dx.doi.org/10.1109/bibm.2010.5706581.

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Tabornal, Racquel U., Jose Maria L. Escaner e Jomar F. Rabajante. "Mathematical Modeling on Competition and Cooperation of Species Using Hill-type Function". In the 11th International Conference. New York, New York, USA: ACM Press, 2019. http://dx.doi.org/10.1145/3307363.3307378.

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Chen, Minghan, Fei Li, Shuo Wang e Yang Cao. "Stochastic Modeling and Simulation of Reaction-Diffusion System with Hill Function Dynamics". In BCB '16: ACM International Conference on Bioinformatics, Computational Biology, and Health Informatics. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/2975167.2985668.

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Pan, Yangchen, Hengshuai Yao, Amir-massoud Farahmand e Martha White. "Hill Climbing on Value Estimates for Search-control in Dyna". In Twenty-Eighth International Joint Conference on Artificial Intelligence {IJCAI-19}. California: International Joint Conferences on Artificial Intelligence Organization, 2019. http://dx.doi.org/10.24963/ijcai.2019/445.

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Dyna is an architecture for model based reinforcement learning (RL), where simulated experience from a model is used to update policies or value functions. A key component of Dyna is search control, the mechanism to generate the state and action from which the agent queries the model, which remains largely unexplored. In this work, we propose to generate such states by using the trajectory obtained from Hill Climbing (HC) the current estimate of the value function. This has the effect of propagating value from high value regions and of preemptively updating value estimates of the regions that the agent is likely to visit next. We derive a noisy projected natural gradient algorithm for hill climbing, and highlight a connection to Langevin dynamics. We provide an empirical demonstration on four classical domains that our algorithm, HC Dyna, can obtain significant sample efficiency improvements. We study the properties of different sampling distributions for search control, and find that there appears to be a benefit specifically from using the samples generated by climbing on current value estimates from low value to high value region.

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Filipowska, Renata. "The use of the cosine function in modelling of a ski jumping in-run hill". In CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST). AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114246.

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Ramaglia, Alessandro D., e Paolo Villari. "Creep and Fatigue of Single Crystal and Directionally Solidified Nickel-Base Blades via a Unified Approach Based on Hill48 Potential Function: Part 2 — Low Cycle Fatigue". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94676.

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In the first part of this work the modeling of the anisotropic plastic and creep response of Single Crystal (SX) and Directionally Solidified (DS) nickel-base blades was discussed. In this second part, the set of tools based on the Hill’s potential function is extended by showing how Hill like operators can be used to describe basic anisotropic features of the low cycle fatigue of SX and DS nickel-base superalloys. To this end a new Hill operator is introduced in order to set empirical life correlations and straightforward calibration procedures were set. The work is accompanied by applications on real heavy duty gas turbine components.

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Wang, Guoqing, Liming Dai e Diankui Liu. "The Scattering Field of SH-Wave in Half-Space With a Semi-Cylindrical Hill and a Horizontal Circular Tunnel". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80117.

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The scattering field of SH-wave in a half-space with a semi-cylindrical hill and a subsurface horizontal hole is studied in the present research by utilizing a complex function and the moving-coordinate method. Based on the concept of ‘conjunction,’ the domain considered is divided into two subdomains. The first subdomain is a cylindrical one which includes the surface of the hill, while the rest is the second subdomain. In the cylindrical subdomain, a standing wave function is constructed which automatically satisfies the zero-stress condition at the hill surface and arbitrary-stress condition at the other part of the circular subdomain. For the second subdomain, which contains a semi-cylindrical canyon and a subsurface hole, a scattering wave function is assumed, which satisfies the zero-stress condition on the horizontal surface. By employing the moving-coordinate method, the solutions of the mathematical model established for the SH-wave can be obtained with the satisfaction of the continuous conditions of stress and displacement across the junction interface together with the zero-stress condition at the surface of the tunnel. The solutions such obtained consist of a series of infinite linear algebraic equations, which can be solved numerically with consideration of the first finite terms corresponding to the frequencies of the wave. For demonstrating the application of the model developed, the displacements of the horizontal and semi-cylindrical hill surfaces are quantified with different properties of wave and geometry parameters.

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