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19th Conference on Applied Mathematics, APLIMAT 2020

作者： Dzenite, Ilona Cernajeva, Sarmite Matvejevs, Aleksandrs Department of Engineering Mathematics Institute of Applied Mathematics Faculty of Computer Science and Information Technology Riga Technical University 2 Daugavgrivas street RigaLV-1007 Latvia

ISBN: (纸本)9788022749831

Due to a successful commitment to developing an international education offer, the number of foreign students enrolled in studies at Riga Technical University (RTU) is increasing significantly every year. In this paper, the authors describe the reasons why engineering studies at RTU are becoming so attractive to foreign students. The conclusions are made on the basis of student surveys and the long teaching experience of the Professors of the engineering Mathematics department. © 19th Conference on Applied Mathematics, APLIMAT 2020 Proceedings. All rights reserved.

关键词： Students

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Detection of oral cancer lesions using hybrid classifier

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AIP Conference Proceedings 2023年第1期2591卷

作者： K. Karpagavadivu C. R. Rathish P. Sindhuja A. Kousalya 1Department of Computer Science Engineering Institute of Technology Coimbatore India 2Department of Computer Engineering New Horizon College of Engineering Bengaluru India 3Department of Computer Science Engineering United Institute of Technology Coimbatore India 4Department of Information Technology Sri Krishna College of Engineering and Technology Coimbatore India

Oral cancer is a main worldwide health problem accounting for 606,520 deaths in 2020, and it is most predominant in the middle-and low-income nations. Permitting computerization in identifying potentially malignant and malignant lesions in the oral cavity would possibly result in low-expense and early detection of the disease. The most important purpose of this research is to find the Oral Cancer Lesions affected region in the tongue images. The current work utilized the GVF algorithm to detect Oral Cancer Lesions using features involved in tongue images. This article offers a novel approach to merging bounding box annotations from different medical practitioners. Additionally, gradient vector flow was used to segment images, where the complicated patterns have been obtained for tackling this difficult task. Using the initial data gathered in this study, a hybrid classifier algorithm was assessed to detect Oral cancer lesions, and features like colour, texture and geometry were extracted. BioMed Chinese Medicine Repository collects the tongue images. Additionally, performances are described categorizing as per the kind of referral decision. Our initial findings establish support vector machine has the probability of challenging this stimulating task.

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Privacy-Preserving Convex Optimization: When Differential Privacy Meets Stochastic Programming

arXiv

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arXiv 2022年

作者： Dvorkin, Vladimir Fioretto, Ferdinando Van Hentenryck, Pascal Pinson, Pierre Kazempour, Jalal Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48103 United States Department of Computer Science University of Virginia CharlottesvilleVA22903 United States H. Milton Stewart School of Industrial and Systems Engineering Georgia Institute of Technology AtlantaGA30332 United States Dyson School of Design Engineering Imperial College London LondonSW7 2AZ United Kingdom Department of Wind and Energy Systems Technical University of Denmark Lyngby2800 Denmark

Convex optimization finds many real-life applications, where – optimized on real data – optimization results may expose private data attributes (e.g., individual health records, commercial information), thus leading to privacy breaches. To avoid these breaches and formally guarantee privacy to optimization data owners, we develop a new privacy-preserving perturbation strategy for convex optimization programs by combining stochastic (chance-constrained) programming and differential privacy. Unlike standard noise-additive strategies, which perturb either optimization data or optimization results, we express the optimization variables as functions of the random perturbation using linear decision rules;we then optimize these rules to accommodate the perturbation within the problem’s feasible region by enforcing chance constraints. This way, the perturbation is feasible and makes different, yet adjacent in the sense of a given distance function, optimization datasets statistically similar in randomized optimization results, thereby enabling probabilistic differential privacy guarantees. The chance-constrained optimization additionally internalizes the conditional value-at-risk measure to model the tolerance towards the worst-case realizations of the optimality loss w.r.t. the non-private solution. We demonstrate the privacy properties of our perturbation strategy analytically and through optimization and machine learning applications. © 2022, CC BY.

关键词： Convex optimization

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Empirical analysis of Android storage management using Network Block Device (NBD) protocol: A comprehensive performance and efficiency study

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Blockchain: Research and Applications 2025年

作者： Tanvir Rahman Tanjid Ahmed Md. Sakibur Rahman Amreen Hossain Jannatun Noor Computing for Sustainability and Social Good (C2SG) Research Group Department of Computer Science and Engineering United International University Dhaka Bangladesh

The NBD (Network Block Device) protocol enhances the Android ecosystem's storage management and power efficiency, particularly on ARM devices. The study addresses storage limitations on ARM devices and explores how NBD can provide a solution. By leveraging NBD, Android devices can connect to remote storage resources and expand storage capacity without physical upgrades. This enables Android devices to be used as controllers for IoT networks and smart home appliances. The study includes statistical comparisons of NBD with alternative protocols like sFTP, iSCSI, NFS, SMB, and HTTP. Through read-and-write tests, NBD exhibits superior performance in bandwidth speed and operation duration, with speeds more than twice as fast as other protocols. Furthermore, the evaluation compares NBD's cloud storage capabilities with popular services such as Google Drive, Dropbox, OneDrive, and GCP. NBD outperforms these services regarding read and write speeds, completing operations much faster. The study also examines NBD's power consumption, demonstrating its energy efficiency compared to other protocols and cloud storage services. NBD's lower power consumption makes it ideal for energy-sensitive Android applications. In conclusion, the integration of NBD into the Android ecosystem enhances efficiency, storage flexibility, and adaptability. It empowers ARM-based Android devices with increased capabilities and versatility.

关键词： Network block device (NBD) Storage system Cloud storage Android kernel Linux Network attached storage (NAS) Internet of things (IoT)

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Conventional Solvent Oxidizes Sn(II) in Perovskite Inks

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ACS ENERGY LETTERS 2020年第4期5卷 1153-1155页

作者： Saidaminov, Makhsud I. Spanopoulos, Ioannis Abed, Jehad Ke, Weijun Wicks, Joshua Kanatzidis, Mercouri G. Sargent, Edward H. Department of Chemistry and Electrical & Computer Engineering Centre for Advanced Materials and Related Technologies (CAMTEC) University of Victoria 3800 Finnerty Road Victoria British Columbia V8P 5C2 Canada Department of Chemistry Northwestern University Evanston Illinois 60208 United States Department of Electrical and Computer Engineering University of Toronto Toronto Ontario M5S 1A4 Canada Department of Materials Science and Engineering University of Toronto Toronto Ontario M5S 1A4 Canada

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Enhancing Spatial Multiplexing and Interference Suppression for Near- and Far-Field Communications with Sparse MIMO

arXiv

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arXiv 2024年

作者： Wang, Huizhi Feng, Chao Zeng, Yong Jin, Shi Yuen, Chau Clerckx, Bruno Zhang, Rui The National Mobile Communications Research Laboratory Southeast University Nanjing210096 China The Purple Mountain Laboratories Nanjing211111 China The School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore The Department of Electrical and Electronic Engineering Imperial College London LondonSW7 2AZ United Kingdom Graz A 8010 Austria School of Science and Engineering Shenzhen Research Institute of Big Data The Chinese University of Hong Kong Guangdong Shenzhen518172 China The Department of Electrical and Computer Engineering National University of Singapore Singapore117583 Singapore

Multiple-input multiple-output (MIMO) has been a key technology for wireless systems for decades. For typical MIMO communication systems, antenna array elements are usually separated by half of the carrier wavelength, thus termed as conventional MIMO. In this paper, we investigate the performance of multi-user MIMO communication, with sparse arrays at both the transmitter and receiver side, i.e., the array elements are separated by more than half wavelength. Given the same number of array elements, the performance of sparse MIMO is compared with conventional MIMO. On one hand, sparse MIMO has a larger aperture, which can achieve narrower main lobe beams that make it easier to resolve densely located users. Besides, increased array aperture also enlarges the near-field communication region, which can enhance the spatial multiplexing gain, thanks to the spherical wavefront property in the near-field region. On the other hand, element spacing larger than half wavelength leads to undesired grating lobes, which, if left unattended, may cause severe inter-user interference (IUI). To gain further insights, we first study the spatial multiplexing gain of the basic single-user sparse MIMO communication system, where a closed-form expression of the near-field effective degree of freedom (EDoF) is derived. The result shows that the EDoF increases with the array sparsity for sparse MIMO before reaching its upper bound, which equals to the minimum value between the transmit and receive antenna numbers. Furthermore, the scaling law for the achievable data rate with varying array sparsity is analyzed and an array sparsity-selection strategy is proposed. We then consider the more general multi-user sparse MIMO communication system. It is shown that sparse MIMO is less likely to experience severe IUI than conventional MIMO, especially when users are densely located, thanks to the nonuniform distribution of spatial angle difference among users. Finally, numerical results are provided

关键词： Near field communication

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Inverse Image Frequency for Long-tailed Image Recognition

arXiv

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arXiv 2022年

作者： Alexandridis, Konstantinos Panagiotis Luo, Shan Nguyen, Anh Deng, Jiankang Zafeiriou, Stefanos Department of Engineering King’s College London LondonWC2R 2LS United Kingdom Department of Computer Science University of Liverpool LiverpoolL69 3BX United Kingdom Department of Computing Imperial College London LondonSW7 2AZ United Kingdom

The long-tailed distribution is a common phenomenon in the real world. Extracted large scale image datasets inevitably demonstrate the long-tailed property and models trained with imbalanced data can obtain high performance for the over-represented categories, but struggle for the underrepresented categories, leading to biased predictions and performance degradation. To address this challenge, we propose a novel de-biasing method named Inverse Image Frequency (IIF). IIF is a multiplicative margin adjustment transformation of the logits in the classification layer of a convolutional neural network. Our method achieves stronger performance than similar works and it is especially useful for downstream tasks such as long-tailed instance segmentation as it produces fewer false positive detections. Our extensive experiments show that IIF surpasses the state of the art on many long-tailed benchmarks such as ImageNet-LT, CIFAR-LT, Places-LT and LVIS, reaching 55.8% top-1 accuracy with ResNet50 on ImageNet-LT and 26.3% segmentation AP with MaskRCNN ResNet50 on LVIS. Code available at https://***/kostas1515/iif Copyright © 2022, The Authors. All rights reserved.

关键词： Object detection

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Generic Tabu Search

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Journal of Software engineering and Applications 2022年第7期15卷 262-273页

作者： Chadi Kallab Samir Haddad Imad El-Zakhem Jinane Sayah Mohamad Chakroun Nisrine Turkey Jinan Charafeddine Hani Hamdan Wafaa Shakir Department of Computer Science and Mathematics Faculty of Arts and Sciences University of Balamand Koura Lebanon Department of Telecom and Networks Issam Fares Faculty of Technology University of Balamand Koura Lebanon Faculty of Computer Science and Electrical Engineering Universit&#228 t Rostock Rostock Germany Faculty of Engineering Notre Dame University Jounieh Lebanon Université Paris-Saclay P&#244 le scientifique et technologique de Vélizy Laboratoire d’Ingénierie des Systèmes de Versailles (LISV EA4048) Vélizy France Université Paris-Saclay CentraleSupélec CNRS Laboratoire des Signaux et Systèmes (L2S UMR CNRS 8506) Gif-sur-Yvette France Department of Computer Systems Faculty of Engineering Al-Furat Al-Awsat Technical University Babil Iraq

The Multiple Sequence Alignment problem is considered to be an NP-Hard problem, requiring initially a specific encoding schema and design, as for any other of its siblings, to implement and run any of the main categories of heuristic. This paper intends to discuss our proposed generic implementation of the Tabu Search algorithm, a heuristic procedure proposed by Fred Glover to solve discrete combinatorial optimization problems. In this research, we try to coordinate and synchronize different designs/implementations discussed in many literatures, with some of the references mentioned in this paper. The basic idea is to avoid that the search for best solutions stops when a local optimum is found, by maintaining a list of non-acceptable or forbidden (taboo) solutions/costs, called Tabu list or Short-Term Memory (STM). In our algorithm, we attempt to add some executions tracing functionalities in order to help later analysis for initial parameters tuning. On the other hand, we propose to include the concept of a list called Long-Term Memory (LTM), so that some of the best solutions found so far can be saved, for search diversification.

关键词： Generic Heuristics Bio-Informatics NP-Hard Tabu Search STM LTM

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GWO-Based Optimal Tuning of Controllers for Shape Memory Alloy Wire Actuators

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IFAC-PapersOnLine 2022年第15期55卷 39-44页

作者： Claudia-Adina Bojan-Dragos Radu-Emil Precup Emil M. Petriu Raul-Cristian Roman Elena-Lorena Hedrea Alexandra-Iulia Szedlak-Stinean Department of Automation and Applied Informatics Politehnica University of Timisoara Bd. V. Parvan 2 300223 Timisoara Romania School of Electrical Engineering and Computer Science University of Ottawa 800 King Eduard Ottawa Ontario K1N 6N5 Canada

The purpose of this paper is to design the optimal controllers for nonlinear processes with Shape Memory Alloy (SMA) wire actuators viewed as controlled processes. Optimal process models are first derived. A comparative analysis is done between the evolved Takagi-Sugeno-Kang (TSK) fuzzy models of SMA wire actuators, two linear dynamic system models with parameters optimally tuned using the recent metaheuristic Grey Wolf Optimiser (GWO) algorithm and one linear dynamic system model obtained in a previous paper using the System Identification Toolbox. Measured input-output data is involved in this comparison. The parameters of two Proportional-Integral-Derivative controllers, a type-1 fuzzy controller and an interval type-2 fuzzy controller are next optimally tuned using GWO, and a comparative analysis of these linear and nonlinear controllers is done. The simulation results illustrate that the type-2 fuzzy controller ensure good performance for these processes.

关键词： Grey Wolf Optimiser optimisation PID controllers shape memory alloy wire actuators Takagi-Sugeno type-1 fuzzy controllers Takagi-Sugeno type-2 fuzzy controllers

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Direct Measurement of Solid-Liquid Interfacial Energy Using a Meniscus

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Physical Review Letters 2022年第24期129卷 246802-246802页

作者： Jingcheng Ma Ishrat Zarin Nenad Miljkovic Department of Mechanical Science and Engineering University of Illinois Urbana 61801 Illinois USA Materials Research Laboratory University of Illinois Urbana 61801 Illinois USA Department of Electrical and Computer Engineering University of Illinois Urbana 61801 Illinois USA International Institute for Carbon Neutral Energy Research (WPI-I2CNER) Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan

Solid-liquid interactions are central to diverse processes. The interaction strength can be described by the solid-liquid interfacial free energy (γSL), a quantity that is difficult to measure. Here, we present the direct experimental measurement of γSL for a variety of solid materials, from nonpolar polymers to highly wetting metals. By attaching a thin solid film on top of a liquid meniscus, we create a solid-liquid interface. The interface determines the curvature of the meniscus, analysis of which yields γSL with an uncertainty of less than 10%. Measurement of classically challenging metal-water interfaces reveals γSL∼30–60 mJ/m2, demonstrating quantitatively that water-metal adhesion is 80% stronger than the cohesion energy of bulk water, and experimentally verifying previous quantum chemical calculations.

关键词： Elemental metals Liquid-solid interfaces Surfaces Water Tension tests

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