0
Your cart

Your cart is empty

Browse All Departments
Price
  • R100 - R250 (4)
  • R250 - R500 (14)
  • R500+ (971)
  • -
Status
Format
Author / Contributor
Publisher

Books > Computing & IT > Applications of computing > Signal processing

Information-Theoretic Methods in Data Science (Hardcover): Miguel R. D. Rodrigues, Yonina C. Eldar Information-Theoretic Methods in Data Science (Hardcover)
Miguel R. D. Rodrigues, Yonina C. Eldar
R2,484 Discovery Miles 24 840 Ships in 10 - 15 working days

Learn about the state-of-the-art at the interface between information theory and data science with this first unified treatment of the subject. Written by leading experts in a clear, tutorial style, and using consistent notation and definitions throughout, it shows how information-theoretic methods are being used in data acquisition, data representation, data analysis, and statistics and machine learning. Coverage is broad, with chapters on signal acquisition, data compression, compressive sensing, data communication, representation learning, emerging topics in statistics, and much more. Each chapter includes a topic overview, definition of the key problems, emerging and open problems, and an extensive reference list, allowing readers to develop in-depth knowledge and understanding. Providing a thorough survey of the current research area and cutting-edge trends, this is essential reading for graduate students and researchers working in information theory, signal processing, machine learning, and statistics.

Advanced Signal Processing On Brain Event-related Potentials: Filtering Erps In Time, Frequency And Space Domains Sequentially... Advanced Signal Processing On Brain Event-related Potentials: Filtering Erps In Time, Frequency And Space Domains Sequentially And Simultaneously (Hardcover)
Fengyu Cong, Tapani Ristaniemi, Heikki Lyytinen
R2,475 Discovery Miles 24 750 Ships in 9 - 17 working days

This book is devoted to the application of advanced signal processing on event-related potentials (ERPs) in the context of electroencephalography (EEG) for the cognitive neuroscience. ERPs are usually produced through averaging single-trials of preprocessed EEG, and then, the interpretation of underlying brain activities is based on the ordinarily averaged EEG. We find that randomly fluctuating activities and artifacts can still present in the averaged EEG data, and that constant brain activities over single trials can overlap with each other in time, frequency and spatial domains. Therefore, before interpretation, it will be beneficial to further separate the averaged EEG into individual brain activities. The book proposes systematic approaches pre-process wavelet transform (WT), independent component analysis (ICA), and nonnegative tensor factorization (NTF) to filter averaged EEG in time, frequency and space domains to sequentially and simultaneously obtain the pure ERP of interest. Software of the proposed approaches will be open-accessed.

S-Parameters for Signal Integrity (Hardcover): Peter J. Pupalaikis S-Parameters for Signal Integrity (Hardcover)
Peter J. Pupalaikis
R3,302 Discovery Miles 33 020 Ships in 10 - 15 working days

Master the usage of s-parameters in signal integrity applications and gain full understanding of your simulation and measurement environment with this rigorous and practical guide. Solve specific signal integrity problems including calculation of the s-parameters of a network, linear simulation of circuits, de-embedding, and virtual probing, all with expert guidance. Learn about the interconnectedness of s-parameters, frequency responses, filters, and waveforms. This invaluable resource for signal integrity engineers is supplemented with the open-source software SignalIntegrity, a Python package for scripting solutions to signal integrity problems.

Filtering, Segmentation and Depth (Paperback, 1993 ed.): Mark Nitzberg, David Mumford, Takahiro Shiota Filtering, Segmentation and Depth (Paperback, 1993 ed.)
Mark Nitzberg, David Mumford, Takahiro Shiota
R1,420 Discovery Miles 14 200 Ships in 18 - 22 working days

Computer vision seeks a process that starts with a noisy, ambiguous signal from a TV camera and ends with a high-level description of discrete objects located in 3-dimensional space and identified in a human classification. This book addresses the process at several levels. First to be treated are the low-level image-processing issues of noise removaland smoothing while preserving important lines and singularities in an image. At a slightly higher level, a robust contour tracing algorithm is described that produces a cartoon of the important lines in the image. Thirdis the high-level task of reconstructing the geometry of objects in the scene. The book has two aims: to give the computer vision community a new approach to early visual processing, in the form of image segmentation that incorporates occlusion at a low level, and to introduce real computer algorithms that do a better job than what most vision programmers use currently. The algorithms are: - a nonlinear filter that reduces noise and enhances edges, - an edge detector that also finds corners and produces smoothed contours rather than bitmaps, - an algorithm for filling gaps in contours.

Gleichstromnetze, Operationsverstarkerschaltungen, elektrische und magnetische Felder (German, Paperback, 2nd ed.): Christian... Gleichstromnetze, Operationsverstarkerschaltungen, elektrische und magnetische Felder (German, Paperback, 2nd ed.)
Christian Spieker, Oliver Haas
R788 R687 Discovery Miles 6 870 Save R101 (13%) Ships in 18 - 22 working days
Modalanalyse (German, Paperback, 1. Aufl. 2020): Michael Moeser Modalanalyse (German, Paperback, 1. Aufl. 2020)
Michael Moeser
R1,457 Discovery Miles 14 570 Ships in 18 - 22 working days

In diesem Band der Reihe Fachwissen Technische Akustik wird das Verfahren der experimentellen Modalanalyse vorgestellt. Mit diesem Verfahren koennen die von der Ausbreitung von Luft- und Koerperschall bestimmten dynamischen Eigenschaften von Systemen untersucht werden. Beispiele fur solche Systeme sind Strukturen im Maschinen- und Fahrzeugbau oder auch kleinere Innenraume, deren akustischen Verhalten von Interesse ist. In einer Einfuhrung wird zunachst auf den Zusammenhang des physikalischen Modells und des systemtheoretischen Modells eingegangen sowie der Nutzen des modalen Modells fur die Beschreibung der Systemeigenschaften erlautert. Danach wird die dem modalen Modell zugrunde liegende Theorie sowie der Zusammenhang der modalen Parameter mit den im Systemmodell verwendeten Frequenzgangen dargestellt. Verschiedene Verfahren der experimentellen Modalanalyse werden diskutiert, darunter sowohl solche zur getrennten Bestimmung einzelner modaler Parameter als auch solche, bei denen eine Vielzahl modaler Parameter gleichzeitig aus den gemessenen Frequenzgangen ermittelt wird. Zusatzlich wird auf das praktische Vorgehen bei der Gewinnung der dazu notwendigen Messdaten und die Moeglichkeiten zur UEberprufung der Ergebnisse eingegangen. Zur Demonstration der verschiedenen Moeglichkeiten und Verfahren wird ein einfaches praktisches Beispiel ausfuhrlich behandelt. Das umfasst die Vorgehensweise bei der Messung ebenso wie die Anwendung unterschiedlich aufwandiger Verfahren zur Extraktion der modalen Parameter. Dazu werden zahlreiche Ergebnisse gezeigt, so dass Moeglichkeiten und Grenzen der experimentellen Modalanalyse deutlich werden.

Optimum Array Processing - Part IV of Detection, Estimation and Modulation Theory (Hardcover, Part IV ed.): HL Van Trees Optimum Array Processing - Part IV of Detection, Estimation and Modulation Theory (Hardcover, Part IV ed.)
HL Van Trees
R5,478 Discovery Miles 54 780 Ships in 10 - 15 working days

"Once again, Harry Van Trees has written the definitive textbook and research reference."
–Norman L. Owsley
Office of Naval Research, IPA University of Rhode Island

A comprehensive treatment of optimum array processing

Array processing plays an important role in many diverse application areas, including radar, sonar, communications, seismology, radio astronomy, tomography, and cellular communications.

Optimum Array Processing gives an integrated presentation of classical and statistical array processing. Classical analysis and synthesis techniques for linear and planar arrays are developed. A statistical characterization of space-time random processes is provided. Many different aspects of optimum array processing are covered, including waveform estimation, adaptive beamforming, parameter estimation, and signal detection. Both plane-wave signals and spatially spread signals are studied, and all results are developed in a pedagogically sound manner.

This book provides a fundamental understanding of array processing that is ample preparation for research or implementation of actual array processing systems. It provides a comprehensive synthesis of the array processing literature and includes more than 2,000 references. Readers will find an extensive variety of models and criteria for study and comparison, realistic examples and practical applications of optimum algorithms, challenging problems that expand the book’s material, and detailed derivations of important results. A supplemental Web site is available that contains MATLAB scripts for most of the figures used in the book so readers can explore diverse scenarios.

The book uses results from Parts I and III of Detection, Estimation, and Modulation Theory. These two books have been reprinted in paperback for availability.

For students in signal processing or professionals looking for thorough understanding of array processing theory, Optimum Array Processing provides authoritative, comprehensive coverage in the same clear manner as the earlier parts of Detection, Estimation, and Modulation Theory.

Introduction to Medical Image Analysis (Paperback, 1st ed. 2020): Rasmus R. Paulsen, Thomas B. Moeslund Introduction to Medical Image Analysis (Paperback, 1st ed. 2020)
Rasmus R. Paulsen, Thomas B. Moeslund
R1,294 Discovery Miles 12 940 Ships in 18 - 22 working days

This easy-to-follow textbook presents an engaging introduction to the fascinating world of medical image analysis. Avoiding an overly mathematical treatment, the text focuses on intuitive explanations, illustrating the key algorithms and concepts in a way which will make sense to students from a broad range of different backgrounds. Topics and features: explains what light is, and how it can be captured by a camera and converted into an image, as well as how images can be compressed and stored; describes basic image manipulation methods for understanding and improving image quality, and a useful segmentation algorithm; reviews the basic image processing methods for segmenting or enhancing certain features in an image, with a focus on morphology methods for binary images; examines how to detect, describe, and recognize objects in an image, and how the nature of color can be used for segmenting objects; introduces a statistical method to determine what class of object the pixels in an image represent; describes how to change the geometry within an image, how to align two images so that they are as similar as possible, and how to detect lines and paths in images; provides further exercises and other supplementary material at an associated website. This concise and accessible textbook will be invaluable to undergraduate students of computer science, engineering, medicine, and any multi-disciplinary courses that combine topics on health with data science. Medical practitioners working with medical imaging devices will also appreciate this easy-to-understand explanation of the technology.

Inference and Learning from Data: Ali H. Sayed Inference and Learning from Data
Ali H. Sayed
R6,509 Discovery Miles 65 090 Ships in 9 - 17 working days

This extraordinary three-volume work, written in an engaging and rigorous style by a world authority in the field, provides an accessible, comprehensive introduction to the full spectrum of mathematical and statistical techniques underpinning contemporary methods in data-driven learning and inference. The first volume, Foundations, establishes core topics in inference and learning, and prepares readers for studying their practical application. The second volume, Inference, introduces readers to cutting-edge techniques for inferring unknown variables and quantities. The final volume, Learning, provides a rigorous introduction to state-of-the-art learning methods. A consistent structure and pedagogy is employed throughout all three volumes to reinforce student understanding, with over 1280 end-of-chapter problems (including solutions for instructors), over 600 figures, over 470 solved examples, datasets and downloadable Matlab code. Unique in its scale and depth, this textbook sequence is ideal for early-career researchers and graduate students across many courses in signal processing, machine learning, statistical analysis, data science and inference.

Inference and Learning from Data: Volume 2 - Inference (Hardcover, New Ed): Ali H. Sayed Inference and Learning from Data: Volume 2 - Inference (Hardcover, New Ed)
Ali H. Sayed
R2,375 Discovery Miles 23 750 Ships in 9 - 17 working days

This extraordinary three-volume work, written in an engaging and rigorous style by a world authority in the field, provides an accessible, comprehensive introduction to the full spectrum of mathematical and statistical techniques underpinning contemporary methods in data-driven learning and inference. This second volume, Inference, builds on the foundational topics established in volume I to introduce students to techniques for inferring unknown variables and quantities, including Bayesian inference, Monte Carlo Markov Chain methods, maximum-likelihood estimation, hidden Markov models, Bayesian networks, and reinforcement learning. A consistent structure and pedagogy is employed throughout this volume to reinforce student understanding, with over 350 end-of-chapter problems (including solutions for instructors), 180 solved examples, almost 200 figures, datasets and downloadable Matlab code. Supported by sister volumes Foundations and Learning, and unique in its scale and depth, this textbook sequence is ideal for early-career researchers and graduate students across many courses in signal processing, machine learning, statistical analysis, data science and inference.

Multiraten Signalverarbeitung, Filterbanke Und Wavelets - Verstandlich Erlautert Mit Matlab/Simulink (German, Paperback): Josef... Multiraten Signalverarbeitung, Filterbanke Und Wavelets - Verstandlich Erlautert Mit Matlab/Simulink (German, Paperback)
Josef Hoffmann
R1,461 R1,214 Discovery Miles 12 140 Save R247 (17%) Ships in 18 - 22 working days
Principles of Cyber-Physical Systems - An Interdisciplinary Approach (Hardcover): Sandip Roy, Sajal K. Das Principles of Cyber-Physical Systems - An Interdisciplinary Approach (Hardcover)
Sandip Roy, Sajal K. Das
R3,932 Discovery Miles 39 320 Ships in 10 - 15 working days

This unique introduction to the foundational concepts of cyber-physical systems (CPS) describes key design principles and emerging research trends in detail. Several interdisciplinary applications are covered, with a focus on the wide-area management of infrastructures including electric power systems, air transportation networks, and health care systems. Design, control and optimization of cyber-physical infrastructures are discussed, addressing security and privacy issues of networked CPS, presenting graph-theoretic and numerical approaches to CPS evaluation and monitoring, and providing readers with the knowledge needed to operate CPS in a reliable, efficient, and secure manner. Exercises are included. This is an ideal resource for researchers and graduate students in electrical engineering and computer science, as well as for practitioners using cyber-physical systems in aerospace and automotive engineering, medical technology, and large-scale infrastructure operations.

Signals and Systems - Principles and Applications (Hardcover): Shaila Dinkar Apte Signals and Systems - Principles and Applications (Hardcover)
Shaila Dinkar Apte
R1,833 Discovery Miles 18 330 Ships in 10 - 15 working days

This book provides a rigorous treatment of deterministic and random signals. It offers detailed information on topics including random signals, system modelling and system analysis. System analysis in frequency domain using Fourier transform and Laplace transform is explained with theory and numerical problems. The advanced techniques used for signal processing, especially for speech and image processing, are discussed. The properties of continuous time and discrete time signals are explained with a number of numerical problems. The physical significance of different properties is explained using real-life examples. To aid understanding, concept check questions, review questions, a summary of important concepts, and frequently asked questions are included. MATLAB programs, with output plots and simulation examples, are provided for each concept. Students can execute these simulations and verify the outputs.

Scalable Signal Processing in Cloud Radio Access Networks (Paperback, 1st ed. 2019): Ying Jun (Angela) Zhang, Congmin Fan,... Scalable Signal Processing in Cloud Radio Access Networks (Paperback, 1st ed. 2019)
Ying Jun (Angela) Zhang, Congmin Fan, Xiaojun Yuan
R1,521 Discovery Miles 15 210 Ships in 18 - 22 working days

This Springerbreif introduces a threshold-based channel sparsification approach, and then, the sparsity is exploited for scalable channel training. Last but not least, this brief introduces two scalable cooperative signal detection algorithms in C-RANs. The authors wish to spur new research activities in the following important question: how to leverage the revolutionary architecture of C-RAN to attain unprecedented system capacity at an affordable cost and complexity. Cloud radio access network (C-RAN) is a novel mobile network architecture that has a lot of significance in future wireless networks like 5G. the high density of remote radio heads in C-RANs leads to severe scalability issues in terms of computational and implementation complexities. This Springerbrief undertakes a comprehensive study on scalable signal processing for C-RANs, where 'scalable' means that the computational and implementation complexities do not grow rapidly with the network size. This Springerbrief will be target researchers and professionals working in the Cloud Radio Access Network (C-Ran) field, as well as advanced-level students studying electrical engineering.

Impedance Spectroscopy - Advanced Applications: Battery Research, Bioimpedance, System Design (Paperback): Olfa Kanoun Impedance Spectroscopy - Advanced Applications: Battery Research, Bioimpedance, System Design (Paperback)
Olfa Kanoun
R3,148 Discovery Miles 31 480 Ships in 18 - 22 working days

Impedance Spectroscopy is a powerful measurement method used in many application fields such as electrochemistry, material science, biology and medicine, semiconductor industry and sensors. Using the complex impedance at various frequencies increases the informational basis that can be gained during a measurement. It helps to separate different effects that contribute to a measurement and, together with advanced mathematical methods, non-accessible quantities can be calculated. This book covers new advances in the field of impedance spectroscopy including fundamentals, methods and applications. It releases scientific contributions from the International Workshop on Impedance Spectroscopy (IWIS) as extended chapters including detailed information about recent scientific research results. The book includes typically subsections on: Fundamental of Impedance Spectroscopy Bio impedance Techniques and Applications Impedance Spectroscopy for Energy Storage Systems Sensors Based on Impedance Spectroscopy Measurement systems Excitation Signals Modeling Parameter extraction

Communication, Signal Processing & Information Technology - Extended Papers (Paperback, Digital original): Faouzi Derbel, Nabil... Communication, Signal Processing & Information Technology - Extended Papers (Paperback, Digital original)
Faouzi Derbel, Nabil Derbel, Olfa Kanoun
R2,176 Discovery Miles 21 760 Ships in 18 - 22 working days

The book elaborates selected, extended and peer reviewed papers on Communication and Signal Proceesing. As Vol. 8 of the series on "Advances on Signals, Systems and Devices" it presents main topics such as: content based video retrieval, wireless communication systems, biometry and medical imaging, adaptive and smart antennae.

Sensor-Technologien (German, Paperback): Marcus Wolff Sensor-Technologien (German, Paperback)
Marcus Wolff
R1,929 R1,561 Discovery Miles 15 610 Save R368 (19%) Ships in 18 - 22 working days
Advanced Wireless Transmission Technologies - Analysis and Design (Hardcover): Hong-Chuan Yang, Mohamed-Slim Alouini Advanced Wireless Transmission Technologies - Analysis and Design (Hardcover)
Hong-Chuan Yang, Mohamed-Slim Alouini
R4,121 Discovery Miles 41 210 Ships in 10 - 15 working days

Elucidating fundamental design principles by means of accurate trade-off analysis of relevant design options using suitable mathematical tools, this is the first book to provide a coherent treatment of transmission technologies essential to current and future wireless systems. Develop in-depth knowledge of the capabilities and limitations of wireless transmission technologies in supporting high-quality wireless transmission services, and foster a thorough understanding of various design trade-offs, to help identify an ideal choice for your own application requirements. Key technologies such as advanced diversity combining, multi-user scheduling, multi-user multi-antenna transmission, relay transmission, and cognitive radio are examined, making this an essential resource for senior graduate students, researchers, and engineers working in wireless communications.

Signalverarbeitung in Beispielen (German, Paperback): Josef Hoffmann, Franz Quint Signalverarbeitung in Beispielen (German, Paperback)
Josef Hoffmann, Franz Quint
R1,978 R1,600 Discovery Miles 16 000 Save R378 (19%) Ships in 18 - 22 working days
A Foundation in Digital Communication (Hardcover, 2nd Revised edition): Amos Lapidoth A Foundation in Digital Communication (Hardcover, 2nd Revised edition)
Amos Lapidoth
R2,544 Discovery Miles 25 440 Ships in 10 - 15 working days

Written in the intuitive yet rigorous style that readers of A Foundation in Digital Communication have come to expect, this second edition includes entirely new chapters on the radar problem (with Lyapunov's theorem) and intersymbol interference channels, new discussion of the baseband representation of passband noise, and a simpler, more geometric derivation of the optimal receiver for the additive white Gaussian noise channel. Other key topics covered include the definition of the power spectral density of nonstationary stochastic processes, the geometry of the space of energy-limited signals, the isometry properties of the Fourier transform, and complex sampling. Including over 500 homework problems and all the necessary mathematical background, this is the ideal text for one- or two-semester graduate courses on digital communications and courses on stochastic processes and detection theory. Solutions to problems and video lectures are available online.

Sensor-Technologien (German, Paperback): Marcus Wolff Sensor-Technologien (German, Paperback)
Marcus Wolff
R2,240 R1,777 Discovery Miles 17 770 Save R463 (21%) Ships in 18 - 22 working days
Elektrotechnik in der Praxis (German, Paperback): Herbert Bernstein Elektrotechnik in der Praxis (German, Paperback)
Herbert Bernstein
R1,511 R1,239 Discovery Miles 12 390 Save R272 (18%) Ships in 18 - 22 working days
Foundations of Signal Processing (Hardcover): Martin Vetterli, Jelena Kovacevic, Vivek K. Goyal Foundations of Signal Processing (Hardcover)
Martin Vetterli, Jelena Kovacevic, Vivek K. Goyal
R2,034 Discovery Miles 20 340 Ships in 10 - 15 working days

This comprehensive and engaging textbook introduces the basic principles and techniques of signal processing, from the fundamental ideas of signals and systems theory to real-world applications. Students are introduced to the powerful foundations of modern signal processing, including the basic geometry of Hilbert space, the mathematics of Fourier transforms, and essentials of sampling, interpolation, approximation and compression The authors discuss real-world issues and hurdles to using these tools, and ways of adapting them to overcome problems of finiteness and localization, the limitations of uncertainty, and computational costs. It includes over 160 homework problems and over 220 worked examples, specifically designed to test and expand students' understanding of the fundamentals of signal processing, and is accompanied by extensive online materials designed to aid learning, including Mathematica (R) resources and interactive demonstrations.

Fundamentals of Stream Processing - Application Design, Systems, and Analytics (Hardcover, New): Henrique C. M. Andrade, Bugra... Fundamentals of Stream Processing - Application Design, Systems, and Analytics (Hardcover, New)
Henrique C. M. Andrade, Bugra Gedik, Deepak S Turaga
R2,515 Discovery Miles 25 150 Ships in 10 - 15 working days

Stream processing is a novel distributed computing paradigm that supports the gathering, processing, and analysis of high-volume, heterogeneous, continuous data streams, to extract insights and actionable results in real time. This comprehensive, hands-on guide combining the fundamental building blocks and emerging research in stream processing is ideal for application designers, system builders, analytic developers, as well as students and researchers in the field. This book introduces the key components of the stream computing paradigm, including the distributed system infrastructure, the programming model, design patterns, and streaming analytics. The explanation of the underlying theoretical principles, illustrative examples and implementations using the IBM InfoSphere Streams SPL language, and real-world case studies provide students and practitioners with a comprehensive understanding of such applications and the middleware that supports them.

Communication Networks - An Optimization, Control, and Stochastic Networks Perspective (Hardcover, New): R. Srikant, Lei Ying Communication Networks - An Optimization, Control, and Stochastic Networks Perspective (Hardcover, New)
R. Srikant, Lei Ying
R1,428 Discovery Miles 14 280 Ships in 10 - 15 working days

Provides a modern mathematical approach to the design of communication networks for graduate students, blending control, optimization, and stochastic network theories. A broad range of performance analysis tools are discussed, including important advanced topics that have been made accessible to students for the first time. Taking a top-down approach to network protocol design, the authors begin with the deterministic model and progress to more sophisticated models. Network algorithms and protocols are tied closely to the theory, illustrating the practical engineering applications of each topic. The background behind the mathematical analyses is given before the formal proofs and is supported by worked examples, enabling students to understand the big picture before going into the detailed theory. End-of-chapter problems cover a range of difficulties, with complex problems broken into several parts, and hints to many problems are provided to guide students. Full solutions are available online for instructors.

Free Delivery
Pinterest Twitter Facebook Google+
You may like...
Multivariate Analysis for Neuroimaging…
Atsushi Kawaguchi Hardcover R4,638 Discovery Miles 46 380
Lies He Told Me
James Patterson, David Ellis Paperback R395 R353 Discovery Miles 3 530
Applied Geotechnics for Construction…
Dhouib Hardcover R3,522 Discovery Miles 35 220
Microfluidics - Modeling, Mechanics and…
Bastian E. Rapp Paperback R6,385 Discovery Miles 63 850
Principles of Foundation Engineering, SI…
Braja Das, Nagaratnam Sivakugan Paperback R1,460 R1,356 Discovery Miles 13 560
Advances in Engineering Design and…
Chenfeng Li, U. Chandrasekhar, … Hardcover R4,057 Discovery Miles 40 570
Algebraic Aspects of Cryptography
Neal Koblitz Hardcover R4,804 Discovery Miles 48 040
Dynamics and Vibrations - Progress in…
Seyed Habibollah Hashemi Kachapi, Davood Domairry Ganji Hardcover R4,585 R3,514 Discovery Miles 35 140
Introduction to Declarer Play
Eddie Kantar, Barbara Seagram Paperback R406 R379 Discovery Miles 3 790
Mathematical Statistics with…
William Mendenhall, Dennis Wackerly, … Paperback R2,854 Discovery Miles 28 540

 

Partners