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Evaluation of the Reliability of a System: Approach by Monte Carlo Simulation and Application

Open Journal of Applied Sciences 2024年第3期14卷 721-739页

作者： Aslain Brisco Ngnassi Djami Jean Bosco Samon Boukar Ousman Ulrich Ngnassi Nguelcheu Wolfgang Nzié Guy Edgar Ntamack Bienvenu Kenmeugne Department of Fundamental Sciences and Techniques of Engineer Chemical Engineering and Mineral Industries School University of Ngaoundere Ngaoundere Cameroon Department of Mechanical Engineering National School of Agro-Industrial Sciences University of Ngaoundere Ngaoundere Cameroon Department of Electrical Engineering Energy and Automation National School of Agro-Industrial Sciences University of Ngaoundere Ngaoundere Cameroon Department of Physics Faculty of Science University of Ngaoundere Ngaoundere Cameroon Department of Industrial and Mechanical Engineering National Advanced School of Engineering University of Yaounde I Yaounde Cameroon

The objective of this paper is to evaluate the reliability of a system in its different states (absence of failures, partial failure and total failure) and to propose actions to improve this reliability by an approach based on Monte Carlo simulation. It consists of a probabilistic evaluation based on Markov Chains. In order to achieve this goal, the functionalities of Markov Chains and Monte Carlo simulation steps are deployed. The application is made on a production system. .

关键词： Evaluation Reliability Monte Carlo Markov Chain

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Comparative Analysis of MEMS Tuning Fork Gyroscope Designs with Microlever Amplification Mechanism for Enhanced Sensitivity and Robustness

Comparative Analysis of MEMS Tuning Fork Gyroscope Designs w...

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International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Uzair Bashir Faraz Javaid Osama Ali Adeel Arshad Masood Ur Rehman Department of Electrical and Computer Engineering Sir Syed CASE Institute of Technology (SS-CASE-IT) Islamabad Pakistan Department of Mechatronics Engineering National University of Sciences and Technology (NUST) Islamabad Pakistan Faculty of Engineering and Technology Superior University Lahore Pakistan

ISBN: (数字)9798350355703

ISBN: (纸本)9798350355710

This paper presents a comparative analysis of two MEMS Tuning Fork Gyroscope (TFG) designs employing microlever amplification mechanisms for sensitivity amplification in the sense mode. An input frame added in microlever amplification frame to increase the robustness of MEMS gyroscope. Design A incorporates a non-anchored input frame in microlever, while Design B features an anchored input frame in microlever. Frequency response analysis and modal analysis were performed using CoventorMEMS+ to evaluate the impact of input frame of microlever on undesired mode suppression, mechanical sensitivity, and robustness. The results indicate that anchoring the microlever in Design B significantly reduces quadrature displacement arise because of environmental linear acceleration in the sense mode while maintaining comparable amplified sensitivity to Design A. Design B offers enhanced stability and robustness, making it a more suitable candidate for precision applications such as autonomous vehicle navigation systems.

关键词： Micromechanical devices Vibrations Sensitivity Navigation Modal analysis Resonant frequency Robustness Stability analysis Gyroscopes Autonomous vehicles

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The Lawn Mowing Problem: From Algebra to Algorithms

arXiv

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arXiv 2023年

作者： Fekete, Sándor P. Krupke, Dominik Perk, Michael Rieck, Christian Scheffer, Christian Department of Computer Science TU Braunschweig Germany Faculty of Electrical Engineering and Computer Science Bochum University of Applied Sciences Bochum Germany

For a given polygonal region P, the Lawn Mowing Problem (LMP) asks for a shortest tour T that gets within Euclidean distance 1/2 of every point in P;this is equivalent to computing a shortest tour for a unit-diameter cutter C that covers all of P. As a generalization of the Traveling Salesman Problem, the LMP is NP-hard;unlike the discrete TSP, however, the LMP has defied efforts to achieve exact solutions, due to its combination of combinatorial complexity with continuous geometry. We provide a number of new contributions that provide insights into the involved difficulties, as well as positive results that enable both theoretical and practical progress. (1) We show that the LMP is algebraically hard: it is not solvable by radicals over the field of rationals, even for the simple case in which P is a 2 × 2 square. This implies that it is impossible to compute exact optimal solutions under models of computation that rely on elementary arithmetic operations and the extraction of kth roots, and explains the perceived practical difficulty. (2) We exploit this algebraic analysis for the natural class of polygons with axis-parallel edges and integer vertices (i.e., polyominoes), highlighting the relevance of turn-cost minimization for Lawn Mowing tours, and leading to a general construction method for feasible tours. (3) We show that this construction method achieves theoretical worst-case guarantees that improve previous approximation factors for polyominoes. (4) We demonstrate the practical usefulness beyond polyominoes by performing an extensive practical study on a spectrum of more general benchmark polygons: We obtain solutions that are better than the previous best values by Fekete et al., for instance sizes up to 20 times larger. Copyright © 2023, The Authors. All rights reserved.

关键词： Traveling salesman problem

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The mathematical model for the design of the RESHeat system 8

The mathematical model for the design of the RESHeat system

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8th International Conference on Smart and Sustainable Technologies, SpliTech 2023

作者： Cisek, Piotr Ocloń, Pawel Nowak-Ocloń, Marzena Kaczmarski, Karol Rerak, Monika Vallatti, Andrea Zielonka, Jakub Pawlowski, Adam Cracow University of Technology The Faculty of Environmental and Energy Engineering ul. Warszawska 24 Kraków31-155 Poland Sapienza University of Rome Department of Ingegneria Astronautica Elettrica Ed Energetica Via Eudossiana 18 Rome00184 Italy Cracow University of Technology The Faculty of Electrical and Computer Engineering ul. Warszawska 24 Kraków31-155 Poland

ISBN: (纸本)9789532901283

This paper presents new computer software for the analysis and selection of components for Resheat systems. The system uses renewable energy sources (RES) to produce heat and electricity. The developed software aims at the optimal selection of the Resheat system elements and their parameters based on the specific constraints of the investor. The Resheat system software takes into account statistical weather data for different project locations with different climates. In addition, the programme can perform a user-defined economic analysis of the system. The calculated results of the system performance in a given year may vary from the actual values by ± 20% for annual values and ± 40% for monthly values due to changing weather conditions in a given year. The results obtained from part of the resheat system (e.g. estimated energy gains from PV) were compared with the results obtained from calculations using commercial software to verify the accuracy of the calculations. The comparison shows that the results obtained from the Resheat software are at an acceptable level. © 2023 University of Split, FESB.

关键词： Energy efficiency

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Complex Permeability Determination for EE Core Based on Flexible PCB Fixture and Magnetic Flux Path Length Analysis

Complex Permeability Determination for EE Core Based on Flex...

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China Power Supply Society Electromagnetic Compatibility Conference (CPEMC)

作者： Huamin Jie Zhenyu Zhao Yongqi Chang Changdong Wang Shiqi Jiang Richard Xian-Ke Gao Kye Yak See School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore Department of Electrical and Computer Engineering National Univeristy of Singapore Singapore Singapore Department of Control Science and Engineering Harbin Institute of Technology Harbin China School of Electronics and Information Engineering Harbin Institute of Technology Harbin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China A*STAR Institute of High Performance Computing Singapore Singapore

ISBN: (数字)9798331509552

ISBN: (纸本)9798331509569

The complex permeability of magnetic cores acts as a vital factor in electromagnetic interference (EMI) filtering choke design and optimization. Many efforts have been reported for toroid cores, but fewer target those with other shapes, such as EE, EI, UU, and UI cores. Owing to their commonly used in planar EMI filters, determining the complex permeability of them is of significance. Targeting EE cores, this paper presents a flexible printed circuit board (PCB)-based fixture adapter tailored designed for performing the measurement, while the corresponding core permeability can be calculated through magnetic flux path length analysis. The experiments validate the effectiveness and accuracy of the proposed methods, spanning a wide frequency range up to 120 MHz.

关键词： Magnetic flux Accuracy Flexible printed circuits Magnetic cores Fixtures Electromagnetic interference Permeability measurement Length measurement Permeability Inductors

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An Software Defined Networking (SDN) Enhanced Edge Computing Framework for Internet of Healthcare Things (IoHT)

An Software Defined Networking (SDN) Enhanced Edge Computing...

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IEEE Conference on Global Communications (GLOBECOM)

作者： Dang Van Anh Abdellah Chehri Nguyen Minh Quy Chu Thi Minh Hue Dinh C. Nguyen Vu Khanh Quy Faculty of Information Technology Hung Yen University of Technology and Education Vietnam Department of Mathematics and Computer Science Royal Military College of Canada Kingston Canada Faculty of Software Engineering FPT University Hanoi Vietnam Department of Electrical and Computer Engineering The University of Alabama in Huntsville Alabama USA

ISBN: (数字)9798350351255

ISBN: (纸本)9798350351262

The rapid proliferation of intelligent Internet of Health Things (IoHT) applications within the context of the COVID-19 pandemic has exerted significant strain on the backhaul network infrastructure. This paper aims to introduce a novel framework that leverages software-defined networking (SDN) to enhance edge computing capabilities. This framework will expect to facilitate dynamic and adaptable communication between edge and cloud servers, specifically designed to support real-time Internet of Health Things applications. Through the establishment of a connection between servers and the Software-Defined Networking controller, the system is expected to facilitate load balancing, network optimization, and the utilization of resources in an efficient manner. This, in turn, enables the provision of real-time healthcare services. Ultimately, the efficacy of the suggested framework is assessed by analyzing its impact on service response time. The research results indicate that the proposed framework significantly benefits IoHT systems’ service response times across various workloads and traffic.

关键词： Cloud computing Collaboration Internet of Medical Things Load management Real-time systems Servers Time factors Software defined networking Optimization Edge computing

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DNR Optimization for Loss Reduction and Voltage Stability Considering EV Charging Load 9

DNR Optimization for Loss Reduction and Voltage Stability Co...

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9th IEEE International Conference on Power and Energy, PECon 2022

作者： Saedi, Azrin Abu Hanifah, Mohd Shahrin Ladin, Hilmi Hela Peeie, Mohamad Heerwan Ghafar, Halim International Islamic University Malaysia Dept. of Electrical and Computer Eng. Gombak Malaysia International Islamic University Malaysia Department of Mechanical Engineering Gombak Malaysia Universiti Malaysia Pahang Faculty of Mechanical Engineering Pekan Malaysia

ISBN: (数字)9781665409902

ISBN: (纸本)9781665409902

In recent years, electric vehicles (EVs) have been a countermeasure to the serious carbon emission problem in the transportation sector. However, despite being one of the essential infrastructures in the EV ecosystem, the EV charging load causes voltage instability and increases power losses in the distribution network. Thus, this paper proposed optimizing distribution network reconfiguration (DNR) to solve the problem. The best two metaheuristic methods, Cuckoo Search Algorithm (CSA) and Particle Swarm Optimization (PSO) were compared to get the optimum solution. It was tested on the IEEE 33-bus system in the MATLAB environment with various cases of charging activity. As a result, the CSA showed better consistency with better power loss reduction and voltage stability compared to PSO. © 2022 IEEE.

关键词： Electric power distribution

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A Convolutional Neural Network for skin lesion classification in Dermoscopic Images using discrete wavelet transform

A Convolutional Neural Network for skin lesion classificatio...

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European Control Conference (ECC)

作者： Miron Mihaela Anisia Luiza Culea-Florescu Simona Moldovanu Department of Computer Science and Information Technology Faculty of Automation Computers Electrical Engineering and Electronics Galați Dunarea de Jos University of Galati 47 Domneasca Str. Galati Romania Department of Electronics and Telecommunications Faculty of Automation Computers Electrical Engineering and Electronics Galați Dunarea de Jos University of Galati 47 Domneasca Str. Galati Romania

The objective of this paper is to investigate a new technique for skin lesion classification based on discrete wavelet transforms and convolutional networks. More precisely, for preprocessing the images, two 2D family wavelets and Low-Low (LL), High-High (HH) bands were used to generate subimages for each skin lesion image as melanoma and normal nevi. On each subimage datasets of nevi and melanoma, five convolutional neural networks (CNNs) were tested. The experiments were conducted on the public Mednode dataset which contains 170 images (70 melanoma and 100 nevi cases). The accuracy, precision, recall, and F1-score metrics were extracted from confusion matrix for each test performed on the proposed CNN architecture. All metrics show that LL subimages are recommended to be used in classifying melanoma vs. nevi.

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A predictive model of death from cerebrovascular diseases in intensive care units

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Intelligent Medicine 2023年第4期3卷 267-279页

作者： Mohammad Karimi Moridani Seyed Kamaledin Setarehdan Ali Motie Nasrabadi Esmaeil Hajinasrollah Department of Biomedical Engineering Faculty of HealthTehran Medical SciencesIslamic Azad UniversityTehranIran Control and Intelligent Processing Centre of Excellence School of Electrical and Computer EngineeringCollege of EngineeringUniversity of TehranTehranIran Departments of Biomedical Engineering Shahed UniversityTehranIran Loghman Medical Center Shahid Beheshti University of Medical SciencesTehranIran

Objective This study aimed to explore the mortality prediction of patients with cerebrovascular diseases inthe intensive care unit(ICU)by examining the important signals during different periods of admission in theICU,which is considered one of the new topics in the medical *** approaches have been proposed forprediction in this *** of these methods has been able to predict mortality somewhat,but many of thesetechniques require recording a large amount of data from the patients,where recording all data is not possiblein most cases;at the same time,this study focused only on heart rate variability(HRV)and systolic and diastolicblood *** The ICU data used for the challenge were extracted from the Multiparameter Intelligent Monitoring inIntensive Care II(MIMIC-II)Clinical *** proposed algorithm was evaluated using data from 88 cerebrovascular ICU patients,48 men and 40 women,during their first 48 hours of ICU *** electrocardiogram(ECG)signals are related to lead II,and the sampling frequency is 125 *** time of admission and time ofdeath are labeled in all *** this study,the mortality prediction in patients with cerebral ischemia is evaluated using the features extracted from the return map generated by the signal of HRV and blood *** the patient’s future condition,the combination of features extracted from the return mapping generatedby the HRV signal,such as angle(𝛼),area(A),and various parameters generated by systolic and diastolic bloodpressure,including DBPMax−Min SBPSD have been ***,to select the best feature combination,the geneticalgorithm(GA)and mutual information(MI)methods were *** sample t-test statistical analysis was usedto compare the results of two episodes(death and non-death episodes).The P-value for detecting the significancelevel was considered less than *** The results indicate that the new approach presented in this paper can be compared with other methodsor l

关键词： Death prediction Cerebrovascular diseases Intensive care unit Heart rate variability Systolic and diastolic blood pressure Return map

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A Pervasive Achievement of Iterative Mean Filter for An Outlier Extinguish Objective on FVIN

A Pervasive Achievement of Iterative Mean Filter for An Outl...

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2022 International Conference on Power, Energy and Innovations, ICPEI 2022

作者： Patanavijit, Vorapoj Wasayangkool, Kitipoth Srisomboon, Kanabadee Thakulsukanant, Kornkamol Assumption University of Thailand Bangkok Thailand King Mongkut's University of Technology North Bangkok Faculty of Engineering Department of Electrical and Computer Engineering Bangkok Thailand King Mongkut's University of Technology North Bangkok Bangkok Thailand

ISBN: (数字)9781665460194

ISBN: (纸本)9781665460194

For outlier extinguish investigating population, especially on the impulsive outlier, the outlier extinguish approach is a prevalent process, which is first executed before other progress operations therefore the iterative mean filter (IMF) is originated for FVIN (Fix Value Impulsive Noise) and turned into one of the most achievement outlier extinguish approach. This academic article addresses to prospect the outlier extinguish approach established on IMF, which is originated from mean filter in order to carry out the deficiency of the foregoing outlier extinguish approach, for FVIN at omnipresent scattering of outlier consistency (5%-90%). In the experimental analysis, abundant outlier figures, which are unified of F16, Girl, Lena and Pepper at omnipresent scattering of outlier consistency, are examined for analyzing the achievement of an outlier extinguish approach established on iterative mean filter. From these results, the outlier extinguish approach established on IMF has superior achievement, in contrast with SMF, MF, AMF. © 2022 IEEE.

关键词： Median filters

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