检索结果-南通市图书馆

Melanoma Identification Through X-ray Modality Using Inception-v3 Based Convolutional Neural Network

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第7期72卷 37-55页

作者： saad Awadh Alanazi College of Computer and Information Sciences Jouf UniversitySakakaAljouf72341Saudi Arabia

Melanoma,also called malignant melanoma,is a form of skin cancer triggered by an abnormal proliferation of the pigment-producing cells,which give the skin its *** is one of the skin diseases,which is exceptionally and globally dangerous,Skin lesions are considered to be a serious ***-based early recognition and detection procedure is fundamental for melanoma *** detection of melanoma using dermoscopy images improves survival rates *** the same time,well-experienced dermatologists dominate the precision of ***,precise melanoma recognition is incredibly hard due to several factors:low contrast between lesions and surrounding skin,visual similarity between melanoma and non-melanoma lesions,and so ***,reliable automatic detection of skin tumors is critical for pathologists’effectiveness and *** take care of this issue,numerous research centers around the world are creating autonomous image processing-oriented *** suggested deep learning methods in this article to address significant tasks that have emerged in the field of skin lesion image processing:we provided a Convolutional Neural Network(CNN)based framework using an Inception-v3(INCP-v3)melanoma detection scheme and accomplished very high precision(98.96%)against melanoma *** classification framework of CNN is created utilizing TensorFlow and Keras in the backend(in Python).It likewise utilizes Transfer-Learning(TL)*** is prepared on the data gathered from the“International Skin Imaging Collaboration(ISIC)”*** experiments show that the suggested technique outperforms state-of-the-art methods in terms of predictive performance.

关键词： Deep learning chronic obstructive pulmonary disease chronic bronchitis convolutional neural network X-ray images

Identifying high-risk over-entitlement in access control policies using fuzzy logic

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cybersecurity 2022年第2期5卷 75-91页

作者： Simon Parkinson saad Khana Department of Computer Science University of HuddersfieldHuddersfieldHD13DHUK

Analysing access control policies is an essential process for ensuring over-prescribed permissions are identified and removed. This is a time-consuming and knowledge-intensive process, largely because there is a wealth of policy information that needs to be manually examined. Furthermore, there is no standard definition of what constitutes an over-entitled permission within an organisation’s access control policy, making it not possible to develop automated rule-based approaches. It is often the case that over-entitled permissions are subjective to an organisation’s role-based structure, where access is be divided and managed based on different employee needs. In this context, an irregular permission could be one where an employee has frequently changed roles, thus accumulating a wide-ranging set of permissions. There is no one size fits all approach to identifying permissions where an employee is receiving more permission than is necessary, and it is necessary to examine them in the context of the organisation to establish their individual risk. Risk is not a binary measure and, in this work, an approach is built using Fuzzy Logic to determine an overall risk rating, which can then be used to make a more informed decision as to whether a user is over-entitled and presenting risk to the organisation. This requires the exploratory use of establishing resource sensitivity and user trust as measures to determine a risk rating. The paper presents a generic solution, which has been implemented to perform experimental analysis on Microsoft’s New Technology File System to show how this works in practice. A simulation using expert knowledge for comparison is then performed to demonstrate how effective it is at helping the user identify potential irregular permissions.

关键词： Fuzzy control Fuzzy systems Security Access control policies Security analysis Risk Fuzzy logic Risk-adaptive access control

Quantum density functional theory studies of structural,elastic, and opto-electronic properties of ZMoO3 （Z=Ba and Sr） under pressure

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第6期28卷 302-312页

作者： saad Tariq A A Mubarak Saher saad M Imran Jamil S M Sohail Gilani Center of Excellence in Solid State Physics University of PunjabLahore 54590Pakistan Physics Department Rabigh College of Science and ArtsKing Abdulaziz UniversityJeddahSaudi Arabia Center for High Energy Physics University of the PunjabLahore 54590Pakistan Department of Physics School of ScienceUniversity of Management and TechnologyLahore 54770Pakistan Faculty of Science University of Central PunjabCampus 2CLahore 54000Pakistan

In continuation of our recent report on molybdates [Appl. Phys. A 124, 44(2018)], the structural, electronic, elastic,and optical properties of ZMoO3(Z = Ba and Sr) molybdates are investigated under pressure(10 GPa–50 GPa) comprehensively by deploying the density functional theory. Our investigations show that the studied compounds exhibit stable cubic phase with metallic attributes. The thermodynamic parameters such as enthalpy of formation, Debye, and melting temperatures of the compounds are observed to increase with pressure. While the Gr¨uninsen parameter and the coefficient of super-plastic deformation decrease as the pressure increases. Mechanical properties elucidate an increase in measured values of hardness, bulk, shear, and young’s moduli with pressure. Our results suggest that the studied compounds are useful in high pressure optoelectronic devices. The optical properties of BaMoO3(BMO) and SrMoO3(SMO) are computed for the radiation of up to 35 eV. The present compounds show beneficial optical applications in the anti-reflection coating,lenses, and the high avoiding solar heating applications in the variant applied pressure.

关键词： optical properties high pressure elastic properties electronic properties

Analytical fits to the synchrotron functions

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2013年第6期13卷 680-686页

作者： Mourad Fouka saad Ouichaoui Research Center in Astronomy Astrophysics and GeophysicsB. P. 63 Algiers ObservatoryBouzaréah Algiers Algeria Université des Sciences et de la Technologie Houari Boumediène (USTHB) Faculté dePhysique Laboratoire SNIRMB.P. 32 El-Alia 16111 Bab Ezzouar Algiers Algeria

Accurate fitting formulae to the synchrotron function, F（x）, and its com- plementary function, G（x）, are performed and presented. The corresponding relative errors are less than 0.26% and 0.035% for F（x） and G（x）, respectively. To this end we have, first, fitted the modified Bessel functions, Ks/3（x） and K2/3（x）. For all the fitted functions, the general fit expression is the same, and is based on the well known asymptotic forms for low and large values of z for each function. It consists of multi- plying each asymptotic form by a function that tends to unity or zero for low and large values of z. Simple formulae are suggested in this paper, depending on adjustable parameters. The latter have been determined by adopting the Levenberg-Marquardt algorithm. The proposed formulae should be of great utility and simplicity for com- puting spectral powers and the degree of polarization for synchrotron radiation, both for laboratory and astrophysical applications.

关键词： radiation processes: non thermal -- methods: analytical

A Novel Design of an Aquatic Walking Robot Having Webbed Feet

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2017年第5期14卷 576-588页

作者： saad Kashem Hutomo Sufyan Swinburne University of Technology Sarawak CampusJalan Simpang Tiga 93350KuchingSarawakMalaysia

Inspired by the movement of duck that is able to move on land and water utilizing its webbed feet, a novel design of an amphibious robot has been presented in this paper. In contrary, the orthodox design of amphibious robot utilizes the tracks or wheels on land and switches to the propeller to move in water. The proposed design employs same propulsion system as webbed feet to move on land and water. After studying the movement of the duck underwater, a conclusion has been drawn that it is swimming in the water by moving its webbed feet back and forth to generate force to push its body forward. Recreating this phenomenon of duck movement, hybrid robot locomotion has been designed and developed which is able to walk, swim and climb steps using the same propulsion system. Moreover, webbed feet would be able to walk efficiently on muddy, icy or sandy terrain due to uneven distribution of robot weight on the feet. To be able to justify the feasibility of the design, simulations are being carried out using SimulationXpress of the SOLIDWORKS software.

关键词： Amphibious robot webbed feet duck feet robot locomotion swim walk climb propulsion system.

Environmentally Benign Synthesis of 2-Pyrazolines and Cyclohexenones Incorporating Naphthalene Moiety and Their Antimicrobial Evaluation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2014年第1期30卷 68-74页

作者： AI-Bogami Abdullah saad Department of Chemistry Faculty of Science King Abdulaziz University North Jeddah Jeddah 21589 Saudi Arabia

We reported the environmental benign synthesis of chalcones,2-pyrazolines and cyclohexanones under microwave *** were obtained by the condensation of each of 2-hydroxyacetophenone derivatives with a-naphthaldehyde under microwave *** condensation reactions of each of synthesized chalcones with phenyl hydrazine under microwave irradiation in the presence of dry acetic acid as a cyclizing agent gave ***,the new cyclohexenone derivatives,valuable intermediates to synthesize fused heterocycles,have been prepared by the cyclocondensation of each of hydroxychalcones with ethyl *** structures of the synthesized compounds were elucidated by infrared（IR） spectrometry,nuclear magnetic resonance（NMR）,mass spectrometry（MS） and elmental *** results indicate that unlike classical heating,microwave irradiation results in higher yields with shorter and cleaner *** synthesized compounds were screened for antimicrobial activity against Staphylococcus aureus,Escherichia coli,Candida Albicans and Aspergillus *** clarified the effects of different substituents in the tested compounds on the obtaind antibacterial activities and antifungal activities.

关键词： Microwave irradiation 2-Hydroxyacetophenone α-Naphthaldehyde Pyrazoline Cyclohexenone Antimicrobial activity

Comparison of different energy saving lights using solar panel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2016年第4期10卷 466-472页

作者： Huzaifa MUBARAK saad Bin Abul KASHEM Sarawak Campus Swinbume University of Technology Kuching93350 Malaysia

The recent trend in light emitting diode or LED lighting applications and their claimed energy saving capabilities together with their overall attractiveness has us all convinced that they really are a greener alternative to the compact fluorescent lights or CFL. As convincing as it seems, the actual energy saving capabilities of LEDs are yet to be proven scientifically or at the least, on an empirical level when compared to CFLs. This paper tackles the issue with the use of a solar cell by evaluating the photovoltaic current and voltage generated by the solar cell subjected to each lighting system. Graphical representations are drawn and a conclusion is then reached based on the amount of power generation in the solar cells in order to determine the energy saving capabilities of each lighting system and its efficiency. From the result, it has been found that an LED is 3.7 times more power efficient than a CFL based light source of equal wattage.

关键词： CFL LED empirical solar lumens energysaving fluorescent

Homogeneous Finite-Time Consensus Control for Higher-Order Multi-Agent Systems by Full Order Sliding Mode

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2018年第5期31卷 1186-1205页

作者： MONDAL Sanjoy GHOMMAM Jawhar saad Maarouf School of Electrical and Electronic Engineering Nanyang Technological University Department of Electrical Engineering Ecole de technologie superieure

This paper investigates the distributed finite-time consensus tracking problem for higher- order nonlinear multi-agent systems （MASs）. The distributed finite-time consensus protocol is based on full order sliding surface and super twisting algorithm. The nominal consensus control for the MASs is designed based on the geometric homogeneous finite time control technique. The chattering is avoided by designing a full order sliding surface. The switching control is constructed by integrating super twisting algorithm, hence a chattering alleviation protocol is obtained to maintain a smooth control input. The finite time convergence analysis for the leader follower network is presented by using strict Lyapunov function. Finally, the numerical simulations validate the proposed homogeneous full-order sliding mode control for higher-order MASs.

关键词： Finite time control full order sliding mode multi agent systems.

A simulation of doping and trap effects on the spectral response of AlGaN ultraviolet detectors

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2012年第3期33卷 20-23页

作者： Sidi Ould saad Hamady LMOPS University Paul Verlaine-Metz and SUPELEC-2 Rue Edouard Belin57070 MetzFrance

We study,by means of numerical simulation,the impact of doping and traps on the performance of the＂solar blind＂ultraviolet Schottky detector based on *** implemented physical models and AlGaN material properties taken from the literature,or from the interpolation between the binary materials（GaN and AlN） weighted by the mole *** found that doping and traps highly impact the spectral response of the device,and in particular a compromise in the doping concentration must be reached in order to optimize the spectral response of the *** results give us a powerful tool to quantitatively understand the impact of elaboration and processing conditions on photodetector characteristics,and thus identify the key issues for the development of the technology.

关键词： simulation AlGaN ultraviolet detector spectral response