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Communications and Networking (BalkanCom), international Balkan conference on

作者： Kutluhan Taylan İren Abdürrahim Gün Tolga Girici Dept. of Electrical and Electronics Eng. TOBB University of Economics and Technology Ankara Turkey

ISBN: (数字)9798350365955

ISBN: (纸本)9798350365962

We study the deployment of reconfigurable intelligent surfaces (RIS’s) on a cellular area. the RIS’s are mounted on unmanned aerial vehicles that hover on the ground users at a fixed altitude. Severe blockage in millimeter-wave transmission is alleviated by the artifical Line-of-Sight (LoS) created by the UAV-RIS’s. We formulate the optimal deployment of UAV RIS’s as a binary linear optimization problem. We compare the performance of this solution with that of the particle swarm optimization (PSO)-based solution. We also compare the performance with that of the solution wherein the RIS locations are constrained to be equispaced and with equal distance from the base station. Results reveal that binary optimization leads to a good performance with much less run time. Finally we form a dataset and experiment with neural network-based solutions in order to obtain the optimal solution.

关键词： Integer programming Base stations Line-of-sight propagation Reconfigurable intelligent surfaces Autonomous aerial vehicles Particle swarm optimization Millimeter wave communication

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Buffered routing tree construction under buffer placement blockages

Buffered routing tree construction under buffer placement bl...

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Asia and South Pacific Design Automation conference

作者： Wei Chen M. Pedram P. Buch University of Southern California Los Angeles CA USA Magma Design-Automation Inc. Cupertino CA USA

ISBN: (纸本)0769514413

Interconnect delay has become a critical factor in determining the performance of integrated circuits. Routing and buffering are powerful approaches to improve circuit speed and correct timing violations after global placement. this paper presents a dynamic-programming based algorithm for performing net topology construction and buffer insertion and sizing simultaneously under the given buffer-placement blockages. the differences from some previous works are that (1) the buffer locations are not pre-determined, (2) the multi-pin nets are easily handled, and (3) a line-search routing algorithm is implemented to speed up the process. Heuristics are used to reduce the problem complexity, which include limiting number of intermediate solutions, using a continuous buffer sizing model, and restricting the buffer locations along the Hanan graph. the resulting algorithm, named BRBP, was applied to a number of industrial designs and achieved an average of 7.9% delay improvement compared to a conventional design flow.

关键词： Routing Integrated circuit interconnections Delay Timing Heuristic algorithms Circuit topology Algorithm design and analysis Wire Design automation Dynamic programming

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Extraction of PV module electrical parameters based on the single diode and double diode model of a PV cell

Extraction of PV module electrical parameters based on the s...

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international Multidisciplinary conference on Computer and Energy Science (SpliTech)

作者： Petar Mari7 Ivan Marasovi7 Ivan Bevanda Tihomir Betti Faculty for mechanical engineering computing and electrical engineering University of Mostar Mostar Bosnia and Herzegovina Faculty for electrical engineering mechanical engineering and naval architecture University of Split Split Croatia

ISBN: (纸本)9781665488280

In this paper the modelling of the photovoltaic module has been applied through the experimental flash test data of industrial photovoltaic module. the theoretical background of the single diode model and the double diode model of the photovoltaic module have been described and similar procedures for the extraction and estimation of the unknown parameters have been proposed. the Levenberg-Marquardt optimization algorithm has been used to minimize objective function as a set of five nonlinear equations that were written for five equilibrium points on the current-voltage curve of the photovoltaic module. the single diode model and double diode model have then been simulated with the estimated unknown parameters and a very good matching between flash test data and a simulation data.

关键词： Photovoltaic systems Nonlinear equations Computational modeling Estimation Linear programming Mathematical models Data models

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Assessing the performance portability of modern parallel programming models using TeaLeaf

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CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE 2017年第15期29卷

作者： Martineau, Matthew McIntosh-Smith, Simon Gaudin, Wayne Univ Bristol HPC Grp Bristol Avon England UK Atom Weap Estab AWE Aldermaston England

In this work, we evaluate several emerging parallel programming models: Kokkos, RAJA, OpenACC, and OpenMP 4.0, against the mature CUDA and OpenCL APIs. Each model has been used to port Tealeaf, a miniature proxy application, or mini app, that solves the heat conduction equation and belongs to the Mantevo Project. We find that the best performance is achieved with architecture-specific implementations but that, in many cases, the performance portable models are able to solve the same problems to within a 5% to 30% performance penalty. While the models expose varying levels of complexity to the developer, they all achieve reasonable performance with this application. As such, if this small performance penalty is permissible for a problem domain, we believe that productivity and development complexity can be considered the major differentiators when choosing a modern parallel programming model to develop applications like Tealeaf.

关键词： Kokkos OpenMP 4 0 performance portability programming models RAJA

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Statistical Optical Image Analysis for Information System

Statistical Optical Image Analysis for Information System

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IEEE international conference on Future Internet of things and Cloud Workshops (FiCloudW)

作者： Oleksandr O. Ryazantsev Ganna M. Khoroshun Andrii I. Riazantsev Vitalii Ivanov Aleksandr Baturin Volodymyr Dahl East Ukrainian National University Dept. of Programming and Mathematics Volodymyr Dahl East Ukrainian National University Severodonetsk Ukraine

ISBN: (数字)9781728144115

ISBN: (纸本)9781728144122

Optical image processing methods are important for creation and development of an automated measuring information optical system. Statistical methods provide additional information, a better understanding of the object that is being studied. they allow describing main features of the image by several parameters, such as mean value, median and standard deviation. For correlation of the computer simulation and experimental data the method of signal quantization is described. It is defined the parameters of the fitted normal distribution for the optical image variation curve and consent criteria of empirical and theoretical data by Romanovsky method. Obtained results can be used as the preliminary analysis for digital processing of the optical image with application in compression and encryption, holography, identification and tracking.

关键词： Optical imaging Optical diffraction Holography Adaptive optics Standards Holographic optical components Fitting

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Optimization of Li-ion modelling for automotive application: comparison of optimization methods performances

Optimization of Li-ion modelling for automotive application:...

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international conference on Control, Decision and Information Technologies (CoDIT)

作者： Aissam MEDDOUR Nassim RIZOUG Anthony BABIN Laid DEGAA Ecole Supérieure des Techniques Aéronautiques et de Construction Automobile France

ISBN: (数字)9781728159539

ISBN: (纸本)9781728159546

the embedded storage system is the principal part in the electric vehicle. the vehicle's autonomy and price influence depend on the chosen source technology. For that, we must optimize the sizing and the ageing of the storage system using heavy-duty models. these last ones must take into account the battery behavior and the system cost. the development of an accurate multi-physical lithium battery model can be an extremely time-consuming process because of the complexity of the battery electrochemical phenomena that could occur during an automotive application. In this paper, we will start by introducing the proposed dynamic battery model, and submit the possibility of building an accurate dynamic design while highlighting the key objective of our study, which is the optimization algorithms performances comparison in terms of precision and computing time.

关键词： Optimization Aging Computational modeling Batteries Mathematical model Lithium-ion batteries Linear programming

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An Adaptive Image Windowing Method for Real-Time Object Detection on Board

An Adaptive Image Windowing Method for Real-Time Object Dete...

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international conference on Electronics Technology (ICET)

作者： Long Ling Zhijun Lu Manli Shi Jie Wang Yuqing Li Minghe Hu China Academy of Space Technology Beijing Institute of Space Mechanics & Electricity Beijing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

In order to meet the real-time detection and processing requirements of on-board targets in the field of remote sensing image processing, this paper carries out relevant research from the perspective of software optimization and proposes an onboard adaptive image windowing processing method based on differential evolution algorithm to solve the problem of shortage of on-board hardware computing resources. Based on the adaptive differential evolution algorithm, combined with the engineering application scenario, the algorithm innovatively designs an individual objective function to evaluate the “advantages and disadvantages“ of the algorithm evolution results. By coordinating all the target positions to be tracked in the image plane, the algorithm optimizes the number of windows, and considers the application boundary of the algorithm, which can effectively reduce the amount of data to be processed and greatly improve the timeliness of real-time detection on the board without losing the calculation accuracy.

关键词： Target tracking Image processing Software algorithms Object detection Linear programming Real-time systems Hardware

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Centralized -local voltage control of low-voltage distribution network based on photovoltaic -storage combined power generation unit

Centralized -local voltage control of low-voltage distributi...

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China international Electrical and Energy conference (CIEEC)

作者： Xiaolong Chen Ying Xu Bin Li School of Electrical and Information Engineering Tianjin University Tianjin China

ISBN: (数字)9798350359558

ISBN: (纸本)9798350359565

To solve the problem of voltage exceeding limits when high permeability photovoltaic is connected to low-voltage distribution networks, this paper proposes a centralized-local control strategy based on photovoltaic-storage combined power generation unit. In the centralized control stage, the objective function is to minimize grid loss and photovoltaic active power reduction, and the output of the photovoltaic-storage combined power generation unit is used as a decision variable to achieve global optimization. In the local control stage, an improved droop control is adopted to ensure that voltage violations can still be mitigated even when the photovoltaic and load power deviate from the predicted data. Finally, a 21-node low-voltage distribution network is used for simulation, and the results show that the proposed control strategy can effectively solve the problem of voltage exceeding limits and ensure the economic operation of the distribution network.

关键词： Photovoltaic systems Green energy Low voltage Distribution networks Linear programming Mathematical models Permeability

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Resolution of a Routing and Wavelength Assignment Problem by Independent Sets in Conflict Graphs

Resolution of a Routing and Wavelength Assignment Problem by...

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international conference on Control, Decision and Information Technologies (CoDIT)

作者： Olivier Hudry Télécom-Paris / LTCI Palaiseau France

ISBN: (数字)9781728159539

ISBN: (纸本)9781728159546

In an optical network, a Scheduled Lightpath Demand (SLD) is a connection demand between two nodes, during a certain time and with a certain wavelength. We consider the following NP-hard Routing and Wavelength Assignment problem dealing with SLDs: given a set of SLDs and a number W of wavelengths, maximize the number of SLDs to which we can assign a lightpath (i.e. a routing path and a wavelength) without exceeding the number W of available wavelengths. the constraints are: a same wavelength must be assigned all along the routing path of any SLD; at any time, a given wavelength on a given edge of the network cannot be used to satisfy more than one SLD. To solve this problem, we study an approach stating the problem as the successive searches of independent sets in some conflict graphs. Moreover, we improve this approach thanks to a post-optimization method. the experimental results show that this model and the post-optimization method are quite efficient to provide a large number of routed SLDs.

关键词： Superluminescent diodes Routing Linear programming Greedy algorithms Wavelength assignment Optical fibers Information technology

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On test scheduling for core-based SOCs

On test scheduling for core-based SOCs

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Asia and South Pacific Design Automation conference

作者： S. Koranne ED&T/Test Philips Research Laboratories Eindhoven Netherlands

ISBN: (纸本)0769514413

Presents a mathematical model for the problem of scheduling tests for core-based system-on-chip (SOC) VLSI designs. Given a set of tests for each core in the SOC and a set of test resources (e.g., test access mechanisms (TAM)), we determine the test plan for the application of the tests to the SOC. Test planning in this paper refers to the combined activities of test access architecture partitioning and test scheduling. these activities must be performed in conjunction as the choice of the test access architecture influences the test schedule. We justify the formulation of test scheduling w.r.t. minimum average completion time criterion as compared to minimum makespan. We show that then the problem of scheduling tests on TAMs can be mapped onto a graph theoretic problem which has a polynomial time optimal solution. We have implemented our algorithm as a test planner tool TPLAN. We present the theoretical analysis of our approach in this paper and compare our results against those published earlier using integer linear programming techniques with encouraging results.

关键词： System testing Integrated circuit testing Very large scale integration Integer linear programming Firewire Knowledge transfer Pins Mathematical model System-on-a-chip Performance evaluation

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