Academic literature on the topic 'Real interpolation method RIM'

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Journal articles on the topic "Real interpolation method RIM"

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Tin, Phu Tran, Tran Hoang Quang Minh, Tran Thanh Trang, and Nguyen Quang Dung. "Using real interpolation method for adaptive identification of nonlinear inverted pendulum system." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 2 (2019): 1078–89. https://doi.org/10.11591/ijece.v9i2.pp1078-1089.

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In this paper, we investigate the inverted pendulum system by using real interpolation method (RIM) algorithm. In the first stage, the mathematical model of the inverted pendulum system and the RIM algorithm are presented. After that, the identification of the inverted pendulum system by using the RIM algorithm is proposed. Finally, the comparison of the linear analytical model, RIM model, and nonlinear model is carried out. From the results, it is found that the inverted pendulum system by using RIM algorithm has simplicity, low computer source requirement, high accuracy and adaptiveness in the advantages.
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Tin, Phu Tran, Tran Hoang Quang Minh, Tran Thanh Trang, and Nguyen Quang Dung. "Using real interpolation method for adaptive identification of nonlinear inverted pendulum system." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 2 (2019): 1078. http://dx.doi.org/10.11591/ijece.v9i2.pp1078-1089.

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<p>In this paper, we investigate the inverted pendulum system by using real interpolation method (RIM) algorithm. In the first stage, the mathematical model of the inverted pendulum system and the RIM algorithm are presented. After that, the identification of the inverted pendulum system by using the RIM algorithm is proposed. Finally, the comparison of the linear analytical model, RIM model, and nonlinear model is carried out. From the results, it is found that the inverted pendulum system by using RIM algorithm has simplicity, low computer source requirement, high accuracy and adaptiveness in the advantages.</p>
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Phu, Tran Tin, Tran Minh, Anh Vu Le, Quang Dung Nguyen, and Thanh Trang Tran. "Real interpolation method for transfer function approximation of distributed parameter system." TELKOMNIKA Telecommunication, Computing, Electronics and Control 17, no. 4 (2019): 1941–47. https://doi.org/10.12928/TELKOMNIKA.v17i4.11088.

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Distributed parameter system (DPS) presents one of the most complex systems in the control theory. The transfer function of a DPS possibly contents: rational, nonlinear and irrational components. This thing leads that studies of the transfer function of a DPS are difficult in the time domain and frequency domain. In this paper, a systematic approach is proposed for linearizing DPS. This approach is based on the real interpolation method (RIM) to approximate the transfer function of DPS by rational-order transfer function. The results of the numerical examples show that the method is simple, computationally efficient, and flexible.
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Nguyen, Dung Quang. "An Effective Approach of Approximation of Fractional Order System using Real Interpolation Method." Journal of Advanced Engineering and Computation 1, no. 1 (2017): 39. http://dx.doi.org/10.25073/jaec.201711.48.

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Fractional-order controllers are recognized to guarantee better closed-loop performance and robustness than conventional integer-order controllers. However, fractional-order transfer functions make time, frequency domain analysis and simulation significantly difficult. In practice, the popular way to overcome these difficulties is linearization of the fractional-order system. Here, a systematic approach is proposed for linearizing the transfer function of fractional-order systems. This approach is based on the real interpolation method (RIM) to approximate fractional-order transfer function (FOTF) by rational-order transfer function. The proposed method is implemented and compared to CFE high-frequency method; Carlson’s method; Matsuda’s method; Chare ’s method; Oustaloup’s method; least-squares, frequency interpolation method (FIM). The results of comparison show that, the method is simple, computationally efficient, flexible, and more accurate in time domain than the above considered methods. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Phan, Van-Duc, Phu Tran Tin, Nguyen Quang Dung, Minh Tran, and Tran Thanh Trang. "Determination of all stability region of unstable fractional order system in case of bearing system." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (2019): 1734. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp1734-1741.

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In this paper, we propose and investigate the optimal tuning PID controller of unstable fractional order system by desired transient characteristics using the real interpolation method (RIM). The research shows that the main advantages of this method are drawn as the followings: 1) Carrying out an investigation of the stable region of coefficients of a PID controller using D-decomposition method; 2) Applying the method to investigate an unstable fractional order system.
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Phu, Tran Tin, Quang Dung Nguyen, Tran Minh, Phan Van-Duc, Nguyen Hoang-Nam, and Thanh Trang Tran. "Determination of all stability region of unstable fractional order system in case of bearing system." International Journal of Power Electronics and Drive System (IJPEDS) 10, no. 4 (2019): 1734–41. https://doi.org/10.11591/ijpeds.v10.i4.pp1734-1741.

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In this paper, we propose and investigate the optimal tuning PID controller of unstable fractional order system by desired transient characteristics using the real interpolation method (RIM). The research shows that the main advantages of this method are drawn as the followings: 1) Carrying out an investigation of the stable region of coefficients of a PID controller using D-decomposition method; 2) Applying the method to investigate an unstable fractional order system.
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Dao, Sy Luat. "MODELLING AND EVALUATING ELASTIC LINKS IN MULTI-MOTOR AUTOMATIC ELECTRICAL DRIVING SYSTEMS BY USING THE NUMERICALMETHOD." Journal of Science and Technique 15, no. 2 (2020): 88–97. http://dx.doi.org/10.56651/lqdtu.jst.v15.n02.145.

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The paper proposes a new approach for solving the problem of determining the optimal estimation model of the elastic linkage element in multi-motor automatic driving systems using the real interpolation method (RIM). Algorithms and programs based on the RIM have been built for a two-motor electromechanical driving model to approximate the original transfer function that describes the elastic linkage element containing inertialand transcendent components by the transfer function in a rational fraction form. Besides,providing a specific function form, the program also calculates estimation errors for different approximate transfer functions, thereby allowing to determine the structure and parameters of the optimal estimation model.
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Tran Tin, Phu, Le Anh Vu, Minh Tran, Nguyen Quang Dung, and Tran Thanh Trang. "Optimal tuning PID controller of unstable fractional order system by desired transient characteristics using RIM." Indonesian Journal of Electrical Engineering and Computer Science 14, no. 3 (2019): 1177. http://dx.doi.org/10.11591/ijeecs.v14.i3.pp1177-1188.

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<p>In this paper, we propose the method of tuning a conventional PID controller for unstable transient characteristics. The results show that: 1) This is the novel practical method based on the desired settling time and overshoot percentage; 2) The results are close to the desired parameters; 3) The novel method can tune an unstable fractional order system by real interpolation method (RIM); 4) The novel method is simplicity and computer efficiency; 5) The novel method can find an optimal solution for tuning task in both academic and industrial purposes.</p>
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Dung, Nguyen Quang, and Tran Hoang Quang Minh. "A Innovation Identification Approach of Control System by Irrational (Fractional) Transfer." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (2016): 336. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp336-342.

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<p>In this paper, an innovative algorithm of identification of control system, described by irrational transfer function with distributed parameter characteristics - with irrational components, is proposed. Algorithm is based on real interpolation method (RIM). Parameters of irrational transfer function can be identified by its experimental transient responses. Each of them can be represented by an analytic expression, table or graph. The proposed method is computationally efficient, simple and practical, as is illustrated by numerical examples. In the furure, the method can be used for tuning the controller and for direct application construction of adaptive controllers, working on the identification principle.</p>
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Yang, Ying, and Yusen Wei. "RANDOM INTERPOLATION AVERAGE FOR ECG SIGNAL DENOISING USING MULTIPLE WAVELET BASES." Biomedical Engineering: Applications, Basis and Communications 25, no. 04 (2013): 1350042. http://dx.doi.org/10.4015/s1016237213500427.

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The random interpolation average (RIA) is a simple yet good denoising method. It firstly employed several times of random interpolations to a noisy signal, then applied the wavelet transform (WT) denoising to each interpolated signal and averaged all of the denoised signals to finish the denoising process. In this paper, multiple wavelet bases and the level-dependent threshold estimator were used in the RIA scheme so that it can be more suitable for the electrocardiogram (ECG) signal denoising. The synthetic ECG signal, real ECG signal and four types of noise were used to perform comparison experiments. The results show that the proposed method can provide the best signal to noise ratio (SNR) improvement in the deoising applications of the synthetic ECG signal and the real ECG signals. For the real ECG signals denoising, the average SNR improvement is 5.886 dB, while the result of the RIA scheme with single wavelet basis (RIAS), the fully translation-invariant [TI (fully)] and the WT denoising using hard thresholding [WT (hard)] are 5.577, 5.274 and 3.484 dB, respectively.
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Dissertations / Theses on the topic "Real interpolation method RIM"

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Chan, Ka-wai Raif, and 陳嘉慧. "Quality assessment system for property management services in residential properties by reliability interval method (RIM)." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48339787.

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In Hong Kong, the responsibility for building management falls on property owners. To assist in building management, most property owners would appoint a property management company. Fulfilling relevant statutory requirements is mandatory for property management companies; however, it is debatable if meeting the basic statutory requirements is equivalent to providing quality property management services for property owners. In fact, property owners usually have more requests than minimum statutory requirements and it is therefore a multi-factor evaluation system for quality of residential property management services is proposed in this research project. To develop the assessment system, quality property management services criteria, including dimensions and performance items, are identified through desk research and focus group interviews with owners’ representatives and property management practitioners. Interval score and ranking are then assigned to the identified assessment criteria by distributing questionnaires with pilot test to owners’ representatives, property management practitioners and building management team of Home Affairs Department of HKSAR. Data collected from the questionnaire are analyzed with weight assessment method: Reliability Interval Method (RIM) in which importance weightings of the criteria can be developed and statistical analysis is allowed. “Repair and Maintenance (excluding clubhouse facilities, if applicable)” and “Effectiveness of emergency repair and maintenance services”, which are not statutory requirements for managing residential properties, are respectively weighted as the most important dimension and performance item. As far as application of the developed quality assessment system is concerned, services quality provided by major property management companies are measured and compared with questionnaires to students pursuing Housing Management in University of Hong Kong. The correlation between quality of property management services and numbers of properties managed by the company is not statistically significant; however, this is likely due to a small samples size, as the visual display of data suggests a relationship. One interesting finding in this research is the high factor weight of assessment criteria which are not statutory requirements for managing residential properties. Such a result implies that meeting basic statutory requirements is not equivalent to providing quality property management services in the eyes of property owners. Besides, this research provides a framework for future development of a classification system to indicate how good a property is for meeting specific overall grading. This research is important because quality of property management services in residential properties can be quantified and closely monitored with the developed quality assessment system in a performance-based, simple and standard way from the perspective of property owners. As far as the benefits of property management companies, which sell services in keen market, are concerned, it is expected that the system could keep supervising and thus improving the quality of services; delivery of high quality services is a profitable way to differentiate ones from the competitors.<br>published_or_final_version<br>Housing Management<br>Master<br>Master of Housing Management
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Books on the topic "Real interpolation method RIM"

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Stan, I. On the real interpolation method for quasi-normed abelian groups. Univ. din Timisoara, 1985.

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Book chapters on the topic "Real interpolation method RIM"

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Zhang, Xin, Jing Pang, Yingxue Su, Guozhu Zhang, and Gang Ou. "A High Precision Real-Time Low Order Polynomial Interpolation Method for GNSS Satellite Orbit." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-54737-9_26.

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Jovanović, Dejan, and Bruno Dutertre. "Interpolation and Model Checking for Nonlinear Arithmetic." In Computer Aided Verification. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81688-9_13.

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AbstractWe present a new model-based interpolation procedure for satisfiability modulo theories (SMT). The procedure uses a new mode of interaction with the SMT solver that we call solving modulo a model. This either extends a given partial model into a full model for a set of assertions or returns an explanation (a model interpolant) when no solution exists. This mode of interaction fits well into the model-constructing satisfiability (MCSAT) framework of SMT. We use it to develop an interpolation procedure for any MCSAT-supported theory. In particular, this method leads to an effective interpolation procedure for nonlinear real arithmetic. We evaluate the new procedure by integrating it into a model checker and comparing it with state-of-art model-checking tools for nonlinear arithmetic.
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"Chapter 3 The Real Interpolation Method." In North-Holland Mathematical Library. Elsevier, 1991. http://dx.doi.org/10.1016/s0924-6509(08)70075-8.

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"Chapter 4 Selected Questions in The Theory of The Real Interpolation Method." In North-Holland Mathematical Library. Elsevier, 1991. http://dx.doi.org/10.1016/s0924-6509(08)70076-x.

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Ikromov, Isroil A., and Detlef Müller. "Auxiliary Results." In Fourier Restriction for Hypersurfaces in Three Dimensions and Newton Polyhedra (AM-194). Princeton University Press, 2016. http://dx.doi.org/10.23943/princeton/9780691170541.003.0002.

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This chapter compiles various auxiliary results; including variants of van der Corput-type estimates for one-dimensional oscillatory integrals and related sublevel estimates through “integrals of sublevel type.” It also derives a straightforward variant of a beautiful real interpolation method that has been devised by Bak and Seeger and that will allow in some cases the replacement of the more classical complex interpolation methods in the proof of Stein–Tomas-type Fourier restriction estimates by substantially shorter arguments. Last, this chapter derives normal forms for phase functions φ‎ of linear height &lt; 2 for which no linear coordinate system adapted to φ‎ does exist.
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Fukuchi, Tsugio. "Overview of Interpolation Finite Difference Methods Enabling Unlimited High-Accuracy Numerical Calculations." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. https://doi.org/10.3233/faia241400.

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There are many different types of numerical analysis for partial differential equations. Numerical methods that have been studied over a long period of time and have been used in engineering practice include the finite difference method (FDM), finite element method (FEM), and boundary element method (BEM). This paper focuses on the FDM. Conventionally, numerical calculations using the FDM have mostly been performed with second-order accuracy. It usually guarantees a calculation accuracy of 3 to 4 significant figures, which is considered to be sufficient accuracy from an engineering perspective. We generally recognize that numerical calculations are approximate calculations. However, when the FDM is generalized in a way that incorporates the conventional theory, it becomes possible to perform unlimitedly high-accuracy numerical calculations, and it becomes possible to easily perform calculations that converge to a theoretical numerical solution with a certain number of significant figures. This type of numerical calculation system is defined as the interpolation FDM (IFDM). The essential requirement for the establishment of IFDM is the algebraic polynomial approximation of the (real number) analytic function. This paper describes this concept and outlines the theoretical features and computational examples of IFDM, which has three characteristics: (i) the ability to handle arbitrary domains and arbitrary boundary conditions, (ii) unlimited high-accuracy calculations, and (iii) high-speed calculations.
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Song, Xingyu, Zhan Li, Shi Chen, Xin-Qiang Cai, and Kazuyuki Demachi. "An Animation-Based Augmentation Approach for Action Recognition from Discontinuous Video." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. http://dx.doi.org/10.3233/faia240478.

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Action recognition, an essential component of computer vision, plays a pivotal role in multiple applications. Despite significant improvements brought by Convolutional Neural Networks (CNNs), these models suffer performance declines when trained with discontinuous video frames, which is a frequent scenario in real-world settings. This decline primarily results from the loss of temporal continuity, which is crucial for understanding the semantics of human actions. To overcome this issue, we introduce the 4A (Action Animation-based Augmentation Approach) pipeline, which employs a series of sophisticated techniques: starting with 2D human pose estimation from RGB videos, followed by Quaternion-based Graph Convolution Network for joint orientation and trajectory prediction, and Dynamic Skeletal Interpolation for creating smoother, diversified actions using game engine technology. This innovative approach generates realistic animations in varied game environments, viewed from multiple viewpoints. In this way, our method effectively bridges the domain gap between virtual and real-world data. In experimental evaluations, the 4A pipeline achieves comparable or even superior performance to traditional training approaches using real-world data, while requiring only 10% of the original data volume. Additionally, our approach demonstrates enhanced performance on In-the-wild videos, marking a significant advancement in the field of action recognition. The full version of this paper, along with the code and data, can be found at [41].
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Powell, M. J. D. "The Theory of Radial Basis Function Approximation in 1990." In Advances in Numerical Analysis. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198534396.003.0003.

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Abstract Throughout this work {f(x) : x ∈ ℝ} is a real valued function of d variables that is to be approximated by {s(x): x ∈ ℝ}. The radial basis function method gives many useful choices of s that have several advantages over piecewise polynomials. This approach to multivariable approximation is relatively new, however, so many of the most exciting properties have been proved to hold only in special cases. A coherent account of the known theory is presented. It includes some stunning results on orders of convergence and guaranteed nonsingularity of interpolation matrices. Therefore the author believes that radial basis function methods are becoming as important as piecewise polynomials although good software is not yet available for general computer calculations. We shall enjoy the theoretical discoveries that have been made so far and we will note some interesting conjectures. Earlier reviews of theory are presented by Dyn [12,13]. Many successful applications of radial basis functions are mentioned in ·a recent paper that provides an excellent survey of the practical side of the subject (Hardy [22]).
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Baird, Davis. "Analytical Instrumentation and Instrumental Objectivity." In Of Minds and Molecules. Oxford University Press, 2000. http://dx.doi.org/10.1093/oso/9780195128345.003.0013.

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The bulk of this chapter is concerned with analytical chemistry during and for the first decade after World War II. At this time analytical chemistry underwent a radical change, which can most easily be characterized as a shift from wet chemistry to instrumental methods (Baird, 1993). Although this transformation of analytical chemistry may interest readers of this volume for a variety of reasons, I focus here on a shift in the concept and practice of a kind of objectivity. Objectivity is one of those concepts with generally positive connotations, but whose exact characterization proves elusive. A dictionary tells us that, as an adjective, objective applies to that which has “actual existence or reality.” Objective observation is “based on observable phenomena” and “uninfluenced by emotions or personal prejudices” (American Heritage Dictionary, 1993, p. 940). Objectivity, it would seem, either sits next to truth or defines the right route to truth. What emerges here, however, is a more complicated concept—a concept with a history that serves various agendas through suitable shades of meaning and marriages of convenience with other concepts. The development of instrumental methods in analytical chemistry made possible fast, precise, and accurate analyses of a wide variety of important substances. Instrumental methods changed forever the metals industries, medical diagnosis, oil analysis, and forensic analytical chemistry, to mention a few highlights. In a very real sense, these developments in analytical chemistry made contemporary science and technology possible by opening up vast new continents of information about the world, which could be gained relatively easily and applied toward technological and/or scientific ends. I argue here that these developments in analytical chemistry established a paradigm for one kind of concept of objectivity. Ralph Müller, who will play a central role in this discussion, wrote in the January 1947 issue of the Analytical Edition of Industrial and Engineering Chemistry (the journal that subsequently became Analytical Chemistry): . . .The true instrumental method of analysis requires no reduction of data to normal pressure and temperature, no corrections or computations, no reference to correction factors nor interpolation on nomographic charts. . . .
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Conference papers on the topic "Real interpolation method RIM"

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Rocchini, Gabriele. "Some Methods for the Determination of the Polarization Resistance in Corrosion Rate Monitoring and Inhibitor Testing." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87395.

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Abstract The concept of polarization resistance is introduced, considering a real current-voltage characteristic of the electrochemical system. Then some mathematical methods are discussed, which allow its evaluation. The methods considered are linear interpolation, approximation in mean of a function, operative definition, the INTER1 program, the global and finite difference methods. For each method, except the last, an example of application to a particular electrochemical system is given. The results obtained clearly show the advantage of numerical elaboration, considered as an approximate calculation of the first derivative of the current-voltage characteristic, over the old method based on the graphic analysis of the shape of the polarization curve round the mixed potential of the electrochemical system.
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Esling, Philippe, Naotake Masuda, and Axel Chemla--Romeu-Santos. "FlowSynth: Simplifying Complex Audio Generation Through Explorable Latent Spaces with Normalizing Flows." In Twenty-Ninth International Joint Conference on Artificial Intelligence and Seventeenth Pacific Rim International Conference on Artificial Intelligence {IJCAI-PRICAI-20}. International Joint Conferences on Artificial Intelligence Organization, 2020. http://dx.doi.org/10.24963/ijcai.2020/767.

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Audio synthesizers are pervasive in modern music production. These highly complex audio generation functions provide a unique diversity through their large sets of parameters. However, this feature also can make them extremely hard and obfuscated to use, especially for non-expert users with no formal knowledge on signal processing. We recently introduced a novel formalization of the problem of synthesizer control as learning an invertible mapping between an audio latent space, extracted from the audio signal, and a target parameter latent space, extracted from the synthesizer's presets, using normalizing flows. In addition to model a continuous representation allowing to ease the intuitive exploration of the synthesizer, it also provides a ground-breaking method for audio-based parameter inference, vocal control and macro-control learning. Here, we discuss the details of integrating these high-level features to develop new interaction schemes between a human user and the generating device: parameters inference from audio, high-level preset visualization and interpolation, that can be used both in off-time and real-time situations. Moreover, we also leverage LeapMotion devices to allow the control of hundreds of parameters simply by moving one hand across space to explore the low-dimensional latent space, allowing to both empower and facilitate the user's interaction with the synthesizer.
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Wang, Lieke, Mats Kinell, Hossein N. Najafabadi, and Matts Karlsson. "A Three-Regime Based Method for Correlating Film Cooling Effectiveness for Cylindrical and Shaped Holes." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42180.

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To cope with high temperature of the gas from combustor, cooling is often used in the hot gas components in gas turbines. Film cooling is one of the effective methods used in this application. Both cylindrical and fan-shaped holes are used in film cooling. There have been a number of correlations published for both cylindrical and fan-shaped holes regarding film cooling effectiveness. Unfortunately there are no definitive correlations for either cylindrical or fan-shaped holes. This is due to the nature of the complexity of film cooling where many factors influence its performance, e.g., blowing ratio, density ratio, surface angle, downstream distance, expansion angle, hole length, turbulence level, etc. A test rig using infrared camera was built to test the film cooling performance for a scaled geometry from a real nozzle guide vane. Both cylindrical and fan-shaped holes were tested. To correlate the experimental data, a three-regime based method was developed for predicting the film cooling effectiveness. Based on the blowing ratio, the proposed method divides the film cooling performance in three regimes: fully attached (or no jet lift-off), fully jet lift-off, and the transition regime in between. Two separate correlations are developed for fully attached and full jet lift-off regimes, respectively. The method of interpolation from these two regimes is used to predict the film cooling effectiveness for the transition regime, based on the blowing ratio. It has been found this method can give a good correlation to match the experimental data, for both cylindrical and fan-shaped holes. A comparison with literature was also carried out, and it showed a good agreement.
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Stotsky, A., and A. Forgo. "Recursive spline interpolation method for real time engine control applications." In 2003 European Control Conference (ECC). IEEE, 2003. http://dx.doi.org/10.23919/ecc.2003.7085311.

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Hasegawa, Tomohiko, Takanori Emaru, and Ankit A. Ravankar. "Real-time Interpolation Method For Sparse LiDAR Point Cloud Using RGB Camera." In 2021 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2021. http://dx.doi.org/10.1109/ieeeconf49454.2021.9382760.

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Morgunov, Yury N., Vladimir V. Bezotvetnykh, Mikhail S. Lebedev, Aleksandr A. Golov, and Kiseon Kim. "Real-time remote current velocity and direction estimation by means of hydroacoustic reciprocal sound transmission method." In 5th Pacific Rim Underwater Acoustics Conference. Acoustical Society of America, 2016. http://dx.doi.org/10.1121/2.0000182.

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Goncharov, V., V. Rudnicki, and A. Liepinsh. "Numerical form of the automatic-control system mathematical models based on the real interpolation method approach." In 2017 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2017. http://dx.doi.org/10.1109/icieam.2017.8076431.

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Lu, Wangming, Yixiong Ma, and Shuxing Cheng. "Predicting Subsea Wellhead Fatigue Damage with a Machine Learning Based Tool." In SPE Western Regional Meeting. SPE, 2025. https://doi.org/10.2118/224123-ms.

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Abstract Subsea wells are susceptible to wellhead fatigue damage during operation. Accurate and timely prediction of this fatigue damage is crucial for informed rig decisions, ensuring operational safety while minimizing nonproductive time (NPT). However, conventional methods for assessing wellhead fatigue overestimate damage, leading to conservative, time-consuming, and costly design, and operational decisions. To address these limitations, a web-based tool hosting machine learning (ML) models was recently developed to assess the wellhead fatigue damage in a less conservative, real-time manner and comes at no incremental cost to end users. The machine learning models based on existing industry algorithms and the one specifically developed to address high fatigue damage scenarios and data gaps are presented. Validation against field measurement results from Gulf of Mexico (GOM) demonstrates a high success rate for the tool. The ML models utilize measured fatigue damage rate as the target variable and incorporate various environmental data as features, including sea current profiles, wave, and sea water temperature. Due to the high cost, only a small number of wells in the GOM have been equipped with wellhead fatigue monitoring systems during offshore operations, resulting in a scarcity of measurement data. In addition, most of the collected data corresponds to low fatigue damage conditions. To address this challenge and enhance the generality of the machine learning models, an extrapolation workflow has been established. The decision of whether to use interpolation or extrapolation models was made using a Gaussian Mixture Model, followed by employing an XGBoost regressor for interpolation and a linear regression model for extrapolation. This workflow aims to enhance model performance when the input data significantly deviates from the training data. Incorporating extrapolation techniques allows for more robust predictions even in cases where the input data deviates significantly from the previously observed patterns. This groundbreaking tool, the first of its kind in industry, achieved a 100% success rate in validating wells previously monitored for fatigue damage in the GOM. Validation involves comparing the predicted fatigue damage from the tool with the measured fatigue damage. Currently, the tool is being piloted for fatigue risk assessment in subsea well operations in the GOM and has demonstrated superior performance. It may replace conventional wellhead fatigue assessment methods, including physics-based simulation and analysis, as well as fatigue monitoring using measurement equipment like sensors. The novelty of the tool and the developed ML models lies in their ability to assess wellhead fatigue in a real-time manner, incurring no additional cost. The predicted fatigue damage is less conservative, resulting in cost savings for system design and rig operations.
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Huu, Khanh Doan, Tuan Dinh Anh, and Tuan Hoang Duc. "A Real-Time Model Using Interpolation Method and Semi-Empirical Formulas to Estimate Fuel Consumption for Cargo Ships." In 2023 International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM). IEEE, 2023. http://dx.doi.org/10.1109/icieam57311.2023.10139155.

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Sato, Daiki, Yuto Higuchi, Norio Tsuda, and Jun Yamada. "Study on improving the real-time performance of Self-Coupled Distance and Velocity Sensor." In Conference on Lasers and Electro-Optics/Pacific Rim. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleopr.2022.p_ctu17_11.

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Abstract:
Self-coupled distance and velocity sensors calculate distance and velocity using self-coupled signals, which are obtained using the triangular wave modulation of laser diodes. Previous research on distance and velocity sensors based on self-coupled signals used multiple triangular wave pulses to obtain data, which is time-consuming. To solve this problem, we have devised a method to completely measure distance and velocity using a single pulse of the self-coupled signal. This paper reports the verification results of distance and velocity based on a single pulse.
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