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Modified Anam-Net Based Lightweight Deep Learning Model for Retinal Vessel Segmentation

Computers, Materials & Continua 2022年第10期73卷 1501-1526页

作者： Syed Irtaza haider Khursheed Aurangzeb Musaed Alhussein College of Computer and Information Sciences King Saud UniversityRiyadh11543Saudi Arabia Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia

The accurate segmentation of retinal vessels is a challenging taskdue to the presence of various pathologies as well as the low-contrast ofthin vessels and non-uniform illumination. In recent years, encoder-decodernetworks have achieved outstanding performance in retinal vessel segmentation at the cost of high computational complexity. To address the aforementioned challenges and to reduce the computational complexity, we proposea lightweight convolutional neural network (CNN)-based encoder-decoderdeep learning model for accurate retinal vessels segmentation. The proposeddeep learning model consists of encoder-decoder architecture along withbottleneck layers that consist of depth-wise squeezing, followed by fullconvolution, and finally depth-wise stretching. The inspiration for the proposed model is taken from the recently developed Anam-Net model, whichwas tested on CT images for COVID-19 identification. For our lightweightmodel, we used a stack of two 3 × 3 convolution layers (without spatialpooling in between) instead of a single 3 × 3 convolution layer as proposedin Anam-Net to increase the receptive field and to reduce the trainableparameters. The proposed method includes fewer filters in all convolutionallayers than the original Anam-Net and does not have an increasing numberof filters for decreasing resolution. These modifications do not compromiseon the segmentation accuracy, but they do make the architecture significantlylighter in terms of the number of trainable parameters and computation *** proposed architecture has comparatively fewer parameters (1.01M) thanAnam-Net (4.47M), U-Net (31.05M), SegNet (29.50M), and most of the otherrecent works. The proposed model does not require any problem-specificpre- or post-processing, nor does it rely on handcrafted features. In addition,the attribute of being efficient in terms of segmentation accuracy as well aslightweight makes the proposed method a suitable candidate to be used in thescreening platforms at

关键词： Anam-Net convolutional neural network cross-database training data augmentation deep learning fundus images retinal vessel segmentation semantic segmentation

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On-road emissions of CO,CO2 and NOx from four wheeler and emission estimates for Delhi

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Journal of Environmental Sciences 2017年第3期29卷 39-47页

作者： Jaiprakash Gazala Habib Anil Kumar Akash Sharma Minza haider Department of Civil Engineering Indian Institute of Technology DelhiNew Delhi 110016India Department of Mechanical Engineering Indian Institute of Technology DelhiNew Delhi 110016India IEC College of Engineering and Technology Greater NoidaU.P.India

This study presents the emission factor of gaseous pollutants （CO, CO2, and NOx） from on-road tailpipe measurement of 14 passenger cars of different types of fuel and vintage. The trolley equipped with stainless steel duct, vane probe velocity meter, flue gas analyzer, Nondispersive infra red （NDIR） C02 analyzer, temperature, and relative humidity （RH） sensors was connected to the vehicle using a towing system. Lower CO and higher NOx emissions were observed from new diesel cars （post 2010） compared to old cars （post 2005）, which implied that new technological advancement in diesel fueled passenger cars to reduce CO emission is a successful venture, however, the use of turbo charger in diesel cars to achieve high temperature combustion might have resulted in increased NOx emissions. Based on the measured emission factors （g/kg0, and fuel consumption （kg）, the average and 95% confidence interval （CI） bound estimates of CO, CO2, and NOx from four wheeler （4W） in Delhi for the year 2012 were 15.7 （1.4-37.1）, 6234 （386-12,252）, and 30.4 （0.0-103） Gg/year, respectively. The contribution of diesel, gasoline and compressed natural gas （CNG） to total CO, C02 and NOx emissions were 7：84：9, 50：48：2 and 58：41：1 respectively. The present work indicated that the age and the maintenance of vehicle both are important factors in emission assessment therefore, more systematic repetitive measurements coveting wide range of vehicles of different age groups, engine capacity, and maintenance level is needed for refining the emission factors with CI.

关键词： Mobile sampling systemOn-road emissionEmission factorPassengers cars

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Techno-economical evaluation of membrane based biogas upgrading system:A comparison between polymeric membrane and carbon membrane technology

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Green Energy & Environment 2016年第3期1卷 222-234页

作者： Shamim haider Arne Lindbrathen May-Britt Hagg Norwegian University of Science and Technology NTNU Department of Chemical Engineering

A shift to renewable energy sources will reduce emissions of greenhouse gases and secure future energy supplies. In this context, utilization of biogas will play a prominent role. Focus of this work is upgrading of biogas to fuel quality by membrane separation using a carbon hollow fibre(CHF) membrane and compare with a commercially available polymeric membrane(polyimide) through economical assessment. CHF membrane modules were prepared for pilot plant testing and performance measured using CO_2, O_2, N_2. The CHF membrane was modified through oxidation, chemical vapour deposition(CVD) and reduction process thus tailoring pores for separation and increased performance. The post oxidized and reduced carbon hollow fibres(PORCHFs) significantly exceeded CHF performance showing higher CO_2 permeance(0.021 m^3(STP)/m^2 h bar) and CO_2/CH_4 selectivity of 246(5 bar feed vs 50 mbar permeate pressure). The highest performance recorded through experiments(CHF and PORCHF) was used as simulation basis. A membrane simulation model was used and interfaced to 8.6 V Aspen HYSYS.A 300 Nm^3/h mixture of CO_2/CH_4 containing 30-50% CO_2 at feed pressures 6, 8 and 10 bar, was simulated and process designed to recover99.5% CH_4 with 97.5% purity. Net present value(NPV) was calculated for base case and optimal pressure(50 bar for CHF and PORCHF). The results indicated that recycle ratio(recycle/feed) ranged from 0.2 to 10, specific energy from 0.15 to 0.8(kW/Nm^3 feed) and specific membrane area from 45 to 4700(m^2/Nm^3 feed). The high recycle ratio can create problems during start-up, as it would take long to adjust volumetric flow ratio towards 10. The best membrane separation system employs a three-stage system with polyimide at 10 bar, and a two-stage membrane system with PORCHF membranes at 50 bar with recycle. Considering biomethane price of 0.78 $/Nm^3 and a lifetime of 15 years, the technoeconomic analysis showed that payback time for the best cascade is 1.6 months.

关键词： Carbon membrane Biogas upgrading Techno-economical analysis NPV calculations

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Identification of the Major Allergen in Greasy-Back Shrimp (Metapenaeus ensis) by MALDI-TOF-MS

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Journal of Ocean University of China 2010年第2期9卷 178-184页

作者： Samee haider Seafood Safety Lab Ocean University of China

In order to better understand shrimp allergen,some basic characters of the major allergen of greasy-back shrimp(Metapenaeus ensis)were *** major allergen was extracted and separated,and its peptide mass fingerprint(PMF)wasanalyzed using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry(MALDI-TOF-MS).After screening inthe NCBI database with Mascot searching engine,the results indicated that the major allergen of greasy-back shirmp was *** matching search showed that the top protein matched,*** tropomyosin from giant tiger prawn(Penaeusmonodon),had a Mowse value of *** addition,there were 27 queries matched with the allergen in greasy-back shirmp with anamino acid sequence coverage value of 65%.The matching scores and the sequence coverage values were also high with tropomy-osins of other invertebrates,including Tyrophagus putrescentiae and Lepisma *** results indicated that the allergen ofMetapenaeus ensis had high homology with other crustacean allergens,and provided molecular explanations for the highcross-reactivity of the major allergens between crustaceans and some other invertebrates.

关键词： Metapenaeus ensis allergen MALDI-TOF-MS identification

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Advanced DAG-Based Ranking(ADR)Protocol for Blockchain Scalability

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Computers, Materials & Continua 2023年第5期75卷 2593-2613页

作者： Tayyaba Noreen Qiufen Xia Muhammad Zeeshan haider International School of Information Science and Engineering Dalian University of TechnologyDalian116620China School of Software Dalian University of TechnologyDalian116620China

In the past decade,blockchain has evolved as a promising solution to develop secure distributed ledgers and has gained massive ***,current blockchain systems face the problems of limited throughput,poor scalability,and high *** to the failure of consensus algorithms in managing nodes’identities,blockchain technology is considered inappropriate for many applications,e.g.,in IoT environments,because of poor *** paper proposes a blockchain consensus mechanism called the Advanced DAG-based Ranking(ADR)protocol to improve blockchain scalability and *** ADR protocol uses the directed acyclic graph ledger,where nodes are placed according to their ranking positions in the *** allows honest nodes to use theDirect Acyclic Graph(DAG)topology to write blocks and verify transactions instead of a chain of *** using a three-step strategy,this protocol ensures that the system is secured against doublespending attacks and allows for higher throughput and *** first step involves the safe entry of nodes into the system by verifying their private and public *** next step involves developing an advanced DAG ledger so nodes can start block production and verify *** the third step,a ranking algorithm is developed to separate the nodes created by *** eliminating attacker nodes,the nodes are ranked according to their performance in the system,and true nodes are arranged in blocks in topological *** a result,the ADR protocol is suitable for applications in the Internet of Things(IoT).We evaluated ADR on EC2 clusters with more than 100 nodes and achieved better transaction throughput and liveness of the network while adding malicious *** on the simulation results,this research determined that the transaction’s performance was significantly improved over blockchains like Internet of Things Applications(IOTA)and ByteBall.

关键词： Blockchain scalability directed acyclic graph advanced DAG-based ranking protocol

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A dual control strategy for power sharing improvement in islanded mode of AC microgrid

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Protection and Control of Modern Power Systems 2018年第1期3卷 121-128页

作者： Suleman haider Guojie Li Keyou Wang Department of Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

Parallel operation of inverter modules is the solution to increase the reliability,efficiency,and redundancy of inverters in *** sharing among inverters in distributed generators(DGs)is a key *** study investigates the feasibility of power-sharing among parallel DGs using a dual control strategy in islanded mode of a *** control and droop control techniques are established to control the microgrid operation.P-f and Q-E droop control is used to attain real and reactive power *** frequency variation caused by load change is an issue in droop control strategy whereas the tracking error of inverter power in PQ control is also a *** address these issues,two DGs are interfaced with two parallel inverters in an islanded AC *** control is investigated for controlling the output real and reactive power of the DGs by assigning their *** inverter under enhanced droop control implements power reallocation to restore the frequency among the distributed generators with predefined droop characteristics.A dual control strategy is proposed for the AC microgrid under islanded operation without communication *** studies are carried out using MATLAB/SIMULINK and the results show the validity and effective power-sharing performance of the system while maintaining a stable operation when the microgrid is in islanding mode.

关键词： Microgrid Inverter parallel operation control strategy Droop control strategy Frequency restore Power sharing

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Impact of Accelerated Ultraviolet Weathering on Polymeric Composite Insulators Under High Voltage DC Stress

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CSEE Journal of Power and Energy Systems 2022年第3期8卷 922-932页

作者： Israr Ullah Muhammad Amin haider Hussain M.Tariq Nazir Faculty of Electrical Engineering Ghulam Ishaq Khan Institute of Engineering Sciences and TechnologyTopiSwabiKPK23460Pakistan School of Mechanical and Manufacturing Engineering University of New South Wales SydneyNSW 2052Australia School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW 2052Australia

This study investigates the weatherability of room temperature vulcanized(RTV)silicone rubber(SiR)and epoxybased material specimens with a composition of different nano and micro fillers against the collegial effects of high voltage DC,UV and temperature *** power transmission over long distances via HVDC is considered an economic option these days,so to ensure the system reliability,it is also critical to investigate these insulators under DC stress along with other environmental stresses(especially UV and temperature).For experimentation,composite samples *** epoxy(NE),epoxy with 15%micro SiO_(2)(EMS),epoxy with 5%nano SiO_(2)(ENS),neat SiR(NS),SiR with 15%micro SiO_(2)(SMS)and SiR with 5%nano SiO_(2)(SNS)are fabricated and subjected to accelerated aging in a weather chamber for 3,360 *** reveal that SMS and SNS offer better hydrophobic behavior followed by *** noticeable surface discoloration in the form of whitish shade with minor blackish spots is found in the case of SMS,while remaining samples also showed considerable color *** electron microscopy(SEM)and Fourier Transform Infrared Spectroscopy(FTIR)results showed that SNS and SMS presented quite excellent resistance to the exposure of *** and weight of all specimens are evaluated throughout the experiment and particularly for the water immersion ***,leakage current analysis indicated that SNS and SMS revealed high leakage current suppression compare to other *** indicate that SNS and SMS showed enhanced resistance against UV weathering under high voltage direct current stress.

关键词： Aging composites DC stress epoxy insulator UV SiR

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Optimizing the thickness of Ta_(2)O_(5) interfacial barrier layer to limit the oxidization of Ta ohmic interface and ZrO_(2) switching layer for multilevel data storage

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Journal of Materials Science & Technology 2022年第11期106卷 98-107页

作者： Muhammad Ismail haider Abbas Chandreswar Mahata Changhwan Choi Sungjun Kim Division of Electronics and Electrical Engineering Dongguk UniversitySeoul 04620Republic of Korea Division of Materials Science and Engineering Hanyang UniversitySeoul 04763Republic of Korea

The multilevel storage capability of nonvolatile resistive random access memory(ReRAM)is greatly de-sired to accomplish high functioning memory *** this study,Ta_(2)O_(5) thin film with different thick-nesses(2,4,and 6 nm)was exploited as an appropriate interfacial barrier layer for limiting the formation of the interfacial layer between the 10 nm thick sputtering deposited resistive switching(RS)layer and Ta ohmic electrode to improve the switching cycle endurance and *** show that lower form-ing voltage,narrow distribution of SET-voltages,good dc switching cycles(10^(3)),high pulse endurance(10^(6) cycles),long retention time(10^(4) s at room temperature and 100℃),and reliable multilevel resis-tance states were obtained at an appropriate thickness of∼2 nm Ta_(2)O_(5) interfacial barrier layer instead of without Ta_(2)O_(5) and with∼4 nm,and∼6 nm Ta_(2)O_(5) barrier layer,ZrO_(2)-based memristive ***,multilevel resistance states have been scientifically investigated via modulating the compliance current(CC)and RESET-stop voltages,which displays that all of the resistance states were distinct and stayed stable without any considerable deprivation over 10^(4) s retention time and 104 pulse endurance *** I-V characteristics of RESET-stop voltage(from−1.7 to−2.3 V)of HRS are found to be a good linear fit with the Schottky *** can be seen that Schottky barrier height rises by increasing the stop-voltage during RESET-operation,resulting in enhancing the data storage memory window(on/offratio).Moreover,RESET-voltage and CC control of HRS and LRS revealed the physical origin of the RS mecha-nism,which entails the formation and rupture of conducting *** is thoroughly investigated that proper optimization of the barrier layer at the ohmic interface and the switching layer is essential in memristive *** results demonstrate that the ZrO_(2)-based memristive device with an optimized∼2 nm Ta_(2)O_(5) barrier

关键词： Resistive switching Ta_(2)O_(5)/ZrO_(2)bilayer film Barrier layer thickness Multilevel resistance states RESET-stop voltage

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Phytochemical screening, antioxidant and antibacterial properties of daphne mucronata

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Journal of Traditional Chinese Medicine 2019年第6期39卷 764-771页

作者： Ghosia Lutfullah Asma Shah Kafeel Ahmad Jamila haider Centre of Biotechnology and Microbiology University of Peshawar

OBJECTIVE:To aim at preliminary phytochemical screening of Daphne mucronata and evaluate its antioxidant and antibacterial ***:Preliminary phytochemical screening was conducted for the crude extracts using standard *** properties of crude methanolic extracts,n-hexane,chloroform,ethyl acetate and aqueous fractions of leaves,roots and bark were evaluated following standard *** antibacterial activities were checked against Acinetobacter baumannii(***),Escherichia coli(***),Pseudomonas aeruginosa(***),Staphylococcus aureus(***),Morganella morganii(***)and vancomycin resistant ***(VRSA).RESULTS:Carbohydrates,saponins,steroids,phenols/tannins,flavonoids and glycosides were present in different parts of Daphne *** extracts showed good antioxidant activity with EC50 values of 157.82-361.61μg/m *** extracts of roots showed good activity against ***(86.95%),***(85.18%)and ***(84.61%).Methanolic extracts of bark were active against ***(65.21%),***(65.21%)and ***(62.96%).Methanolic extracts of leaves showed good activity against ***(78.26%),***(77.78%),***(74.07%),***(73.07%),***(69.56%),VRSA(68%)and Proteus vulgaris(60%).The n-hexane fraction of roots was effective against ***(78.26%).Chlorofom fraction of roots showed moderate activity against ***(60.86%)and ***(61.53%).Ethyl acetate fraction of roots showed moderate activity against ***(69.56%),***(62.96%)and ***(69.23%).CONCLUSION:This study illustrates that Daphne mucronata possesses good antioxidant and antibacterial *** plant could be further exploited as potential natural antioxidant and as a new source of antimicrobials for treatment of various infections.

关键词： Antioxidants Anti-bacterial agents Phytochemicals Daphne mucronata

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Reinforcement Learning-Based Optimization for Drone Mobility in 5G and Beyond Ultra-Dense Networks

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Computers, Materials & Continua 2021年第9期68卷 3807-3823页

作者： Jawad Tanveer Amir haider Rashid Ali Ajung Kim School of Optical Engineering Sejong UniversitySeoul05006Korea School of Intelligent Mechatronics Engineering Sejong UniversitySeoul05006Korea

Drone applications in 5th generation(5G)networks mainly focus on services and use cases such as providing connectivity during crowded events,human-instigated disasters,unmanned aerial vehicle traffic management,internet of things in the sky,and situation awareness.4G and 5G cellular networks face various challenges to ensure dynamic control and safe mobility of the drone when it is tasked with delivering these *** drone can fly in three-dimensional *** drone connectivity can suffer from increased handover cost due to several reasons,including variations in the received signal strength indicator,co-channel interference offered to the drone by neighboring cells,and abrupt drop in lobe edge signals due to antenna *** baseline greedy handover algorithm only ensures the strongest connection between the drone and small cells so that the drone may experience several *** for fast environment learning,machine learning techniques such as Q-learning help the drone fly with minimum handover cost along with robust *** this study,we propose a Q-learning-based approach evaluated in three different *** handover decision is optimized gradually using Q-learning to provide efficient mobility support with high data rate in time-sensitive applications,tactile internet,and haptics *** results demonstrate that the proposed algorithm can effectively minimize the handover cost in a learning *** work presents a notable contribution to determine the optimal route of drones for researchers who are exploring UAV use cases in cellular networks where a large testing site comprised of several cells with multiple UAVs is under consideration.

关键词： 5G dense network small cells mobility management reinforcement learning performance evaluation handover management

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