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Fast Convergence Resource Allocation in IEEE 802.16 OFDMA Systems with Minimum Rate Guarantee

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China Communications 2016年第12期13卷 120-131页

作者： Mohammad Mostafavi Javad Musevi Niya Hosein Mohammadi Behzad Mozaffari Tazehkand faculty of electrical and computer engineering University of Tabriz faculty of electrical and computer engineering University of Zanjan

Resource allocation in the context of OFDMA-based systems is challenging, given a combinatorial nature of the problem. In the context of IEEE 802.16 systems this problem is further exacerbated by additional constraints that are faced with its two dimensional frame nature. The main challenges associated with resource allocation in these systems are: mapping the allocated bandwidth resources to users in this two dimensional frame, power and frequency allocation, and Qo S guarantee. This optimization problem can usually be solved by an iterative algorithm. The solutions proposed have a constant step size in iterations which causes a long convergence time. For this reason, the solutions proposed are not applicable in IEEE 802.16 systems. In this paper we propose a novel resource allocation algorithm in IEEE 802.16 systems which has an adaptive step size in iterations while taking into account the minimum rate guarantee for users.

关键词： burst pack channel aware la grangian function OFDMA power allocation sub-channel allocation

Utilizing engineered extracellular vesicles as delivery vectors in the management of ischemic stroke:a special outlook on mitochondrial delivery

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Neural Regeneration Research 2025年第8期20卷 2181-2198页

作者： Jiali Chen Yiyang Li Xingping Quan Jinfen Chen Yan Han Li Yang Manfei Zhou Greta Seng Peng Mok Ruibing Wang Yonghua Zhao Institute of Chinese Medical Sciences State Key Laboratory of Quality Research in Chinese MedicineUniversity of MacaoTaipaMacao Special Administrative RegionChina Department of Pharmacy Hunan Provincial People’s Hospitalthe First Affiliated Hospital of Hunan Normal UniversityChangshaHunan ProvinceChina Department of electrical and computer engineering University of MacaoTaipaMacao Special Administrative RegionChina Department of Pharmaceutical Sciences Faculty of Health SciencesUniversity of MacaoTaipaMacao Special Administrative RegionChina

Ischemic stroke is a secondary cause of mortality worldwide,imposing considerable medical and economic burdens on *** vesicles,serving as natural nanocarriers for drug delivery,exhibit excellent biocompatibility in vivo and have significant advantages in the management of ischemic ***,the uncertain distribution and rapid clearance of extracellular vesicles impede their delivery *** utilizing membrane decoration or by encapsulating therapeutic cargo within extracellular vesicles,their delivery efficacy may be greatly ***,previous studies have indicated that microvesicles,a subset of large-sized extracellular vesicles,can transport mitochondria to neighboring cells,thereby aiding in the restoration of mitochondrial function post-ischemic *** extracellular vesicles have also demonstrated the capability to transfer mitochondrial components,such as proteins or deoxyribonucleic acid,or their sub-components,for extracellular vesicle-based ischemic stroke *** this review,we undertake a comparative analysis of the isolation techniques employed for extracellular vesicles and present an overview of the current dominant extracellular vesicle modification *** the complex facets of treating ischemic stroke,we also delineate various extracellular vesicle modification approaches which are suited to different facets of the treatment ***,given the burgeoning interest in mitochondrial delivery,we delved into the feasibility and existing research findings on the transportation of mitochondrial fractions or intact mitochondria through small extracellular vesicles and microvesicles to offer a fresh perspective on ischemic stroke therapy.

关键词： delivery engineering extracellular vesicles identification ischemic stroke isolation mitochondria targeting strategy therapeutic effects

Privacy-preserving explainable AI: a survey

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Science China(Information Sciences) 2025年第1期 23-56页

作者： Thanh Tam NGUYEN Thanh Trung HUYNH Zhao REN Thanh Toan NGUYEN Phi Le NGUYEN Hongzhi YIN Quoc Viet Hung NGUYEN School of Information and Communication Technology Griffith University School of computer and Communication Sciences Ecole Polytechnique Federale de Lausanne faculty of Mathematics and computer Science University of Bremen faculty of Information Technology HUTECH University Department of computer Science Hanoi University of Science and Technology School of electrical engineering and computer Science The University of Queensland

As the adoption of explainable AI(XAI) continues to expand, the urgency to address its privacy implications intensifies. Despite a growing corpus of research in AI privacy and explainability, there is little attention on privacy-preserving model explanations. This article presents the first thorough survey about privacy attacks on model explanations and their countermeasures. Our contribution to this field comprises a thorough analysis of research papers with a connected taxonomy that facilitates the categorization of privacy attacks and countermeasures based on the targeted explanations. This work also includes an initial investigation into the causes of privacy leaks. Finally, we discuss unresolved issues and prospective research directions uncovered in our analysis. This survey aims to be a valuable resource for the research community and offers clear insights for those new to this domain. To support ongoing research, we have established an online resource repository, which will be continuously updated with new and relevant findings.

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Effects of Location,Size and Number of Wind Turbine Receptors on Blade Lightning Protection

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电力系统自动化 2012年第8期36卷 122-127页

作者： Hossein Kazemi KAREGAR Hossein BAGHERIAN faculty of electrical &computer engineering Shahid Beheshti University

Electric and magnetic fields generated by lightning cause a serious hazard to various *** wind turbine installations with higher power capacity are *** power capacity requires higher height and so there is more probability of lightning *** are the most probable components to be struck by *** most common lightning protection system for the blades consists of several metallic receptors on the blade *** are connected to the ground by metallic down-conductors placed inside the blade *** paper studies effects of the receptor configurations on protecting the blade against lightning *** this purpose,an analysis procedure based on finite element method(FEM)in COMSOL Multiphysics software environment is *** voltage distribution around the blade is simulated for various configurations of *** best configuration is *** are performed on the blade model of a special wind turbine,which isVESTAS V47".

关键词：风力发电机组受体刀片防雷叶片表面位置最佳配置发电能力

Low Complexity Adaptive Equalizers for Underwater Acoustic Communications

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China Ocean engineering 2014年第4期28卷 529-540页

作者： Masoumeh SOFLAEI Paeiz AZMI faculty of electrical and computer engineering Tarbiat Modares University

Interference signals due to scattering from surface and reflecting from bottom is one of the most important problems of reliable communications in shallow water channels. To solve this problem, one of the best suggested ways is to use adaptive equalizers. Convergence rate and misadjustment error in adaptive algorithms play important roles in adaptive equalizer performance. In this paper, affine projection algorithm （APA）, selective regressor APA（SR-APA）, family of selective partial update （SPU） algorithms, family of set-membership （SM） algorithms and selective partial update selective regressor APA （SPU-SR-APA） are compared with conventional algorithms such as the least mean square （LMS） in underwater acoustic communications. We apply experimental data from the Strait of Hormuz for demonstrating the efficiency of the proposed methods over shallow water channel. We observe that the values of the steady-state mean square error （MSE） of SR-APA, SPU-APA0 SPU-normalized least mean square （SPU-NLMS）, SPU-SR-APA0 SM-APA and SM-NLMS algorithms decrease in comparison with the LMS algorithm. Also these algorithms have better convergence rates than LMS type algorithm.

关键词： underwater acoustic communication affine projection algorithm (APA) selective regressor APA(SR-APA) selective partial update APA(SPU-APA) SPU-normalized least mean square (SPU-NLMS) algorithm set-membership APA(SM-APA) set-membership NLMS(SM-NLMS) algorithm

A supervised multimanifold method with locality preserving for face recognition using single sample per person

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Journal of Central South university 2017年第12期24卷 2853-2861页

作者： Nabipour Mehrasa Aghagolzadeh Ali Motameni Homayun Department of computer engineering Faculty of Engineering Sari Islamic Azad University faculty of electrical and computer engineering Babol Noshirvani University of Technology

Although real-world experiences show that preparing one image per person is more convenient, most of the appearance-based face recognition methods degrade or fail to work if there is only a single sample per person(SSPP). In this work, we introduce a novel supervised learning method called supervised locality preserving multimanifold(SLPMM) for face recognition with SSPP. In SLPMM, two graphs: within-manifold graph and between-manifold graph are made to represent the information inside every manifold and the information among different manifolds, respectively. SLPMM simultaneously maximizes the between-manifold scatter and minimizes the within-manifold scatter which leads to discriminant space by adopting locality preserving projection(LPP) concept. Experimental results on two widely used face databases FERET and AR face database are presented to prove the efficacy of the proposed approach.

关键词： face recognition locality preserving manifold learning single sample per person

Stochastic optimization for retailers with distributed wind generation considering demand response

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 733-748页

作者： Hessam GOLMOHAMADI Reza KEYPOUR faculty of electrical and computer engineering Semnan University

In this paper, a multi-stage stochastic model is presented for a renewable distributed generation(RDG)-owning retailer to determine the trading strategies existing in a competitive electricity market. Uncertainties associated with wholesale electricity market price, clients' consumption and power output of wind resources are considered through auto regressive integrated moving average(ARIMA) approach. In the proposed method, three trading floors are addressed for the retailer to hedge against the uncertainties. In the first stage, the retailer participates in day-ahead market to supply the clients and in the second stage, intraday market is addressed to allow the retailer to modify the schedule of its clients' consumption/RDG production. Due to unfavorable uncertainties, especially in renewable power production, real-time market is considered in the third stage to diminish the uncertainty at power delivery time. Cost function of wind resources considering capital, operation and maintenance(O&M) cost is incorporated in the objective function to increase the applicability of the mechanism. The proposed approach is formulated for risk-averse and risk-taker retailer through conditional value at risk(CVaR) approach. In order to study the impact of retail strategies on consumption patternand consumers' electricity bills, time-of-use(TOU)demand response programs are discussed in this *** the problem, the mixed integer non-linear programming(MILNP) problem is transformed into mixed integer linear programming(MILP) by jointly using decomposition and disjunctive constraints. Finally, a case study containing wind power resources, energy storage system and retailer is considered to analyze the proficiency of the proposed approach.

关键词： Renewable Retailer Stochastic Uncertainty Demand response

Multi-objective short-term scheduling of active distribution networks for benefit maximization of DisCos and DG owners considering demand response programs and energy storage system

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Journal of Modern Power Systems and Clean Energy 2018年第1期6卷 95-106页

作者： Saeed ABAPOUR Sayyad NOJAVAN Mehdi ABAPOUR faculty of electrical and computer engineering University of Tabriz

This paper proposes a multi-objective benefit function for operation of active distribution systems considering demand response program(DRP)and energy storage system(ESS).In the active distribution system,active network management(ANM)is applied so that the distribution system equipment is controlled in real-time status based on the real-time measurements of system parameters(voltages and currents).The multi-objective optimization problem is solved using e-constraint method,and a fuzzy satisfying approach has been employed to select the best compromise *** different objective functions are considered as follows:benefit maximization of distribution company(DisCo);benefit maximization of distributed generation owner(DGO).To increase the benefits and efficient implementation of distributed generation(DG),DGO has installed battery as energy storage system(ESS)in parallel with DG ***,DGO decides for the battery charging/*** has the ability to exchange energy with the upstream network and ***,DisCo focuses to study the effect of demand response program(DRP)on total benefit function and consequently its influence on the load profile has been *** model is successfully applied to a 33-bus radial distribution network.

关键词： Multi-objective benefit function Active management Distributed generation units Demand response programs Energy storage system

Effects of Wind Turbines Equipped with Doubly-fed Induction Generators on Distance Protection

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电力系统自动化 2012年第8期36卷 128-131页

作者： Hossein Kazemi KAREGAR Maryam KHODDAM faculty of electrical &computer engineering Shahid Beheshti University

Nowadays wind energy is the fastest growing renewable energy resource in the *** problems of integrating wind farms are caused by changes of wind speed during a ***,the behaviors of wind turbines equipped with doubly-fed induction generators differ fundamentally from synchronous ***,more considerations are needed to analyze the performances of the distance protection *** protection of a wind farm with distance relay is *** changing the conditions of the wind farm,the characteristics of the distance relay are studied.

关键词：距离保护双馈异步发电机风力发电机组配备可再生能源资源双馈感应发电机距离继电器同步发电机