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CSRWA:Covert and Severe Attacks Resistant Watermarking Algorithm

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Computers, Materials & Continua 2025年第1期82卷 1027-1047页

作者： Balsam Dhyia Majeed amir Hossein Taherinia Hadi Sadoghi Yazdi Ahad Harati Faculty of Engineering Ferdowsi University of MashhadMashhad***Iran Department of Computer Techniques Engineering Imam Al-Kadhum CollegeBaghdad10087Iraq

Watermarking is embedding visible or invisible data within media to verify its authenticity or protect *** watermark is embedded in significant spatial or frequency features of the media to make it more resistant to intentional or unintentional *** of these features are important perceptual features according to the human visual system(HVS),which means that the embedded watermark should be imperceptible in these ***,both the designers of watermarking algorithms and potential attackers must consider these perceptual features when carrying out their *** two roles will be considered in this paper when designing a robust watermarking algorithm against the most harmful attacks,like volumetric scaling,histogram equalization,and non-conventional watermarking attacks like the Denoising Convolution Neural Network(DnCNN),which must be considered in watermarking algorithm design due to its rising role in the state-of-the-art *** DnCNN is initialized and trained using watermarked image samples created by our proposed Covert and Severe Attacks Resistant Watermarking Algorithm(CSRWA)to prove its *** this algorithm to satisfy the robustness and imperceptibility tradeoff,implementing the Dither Modulation(DM)algorithm is boosted by utilizing the Just Noticeable Distortion(JND)principle to get an improved performance in this ***,luminance,inter and intra-block contrast are used to adjust the JND values.

关键词： Covert attack digital watermarking DnCNN JND perceptual model robustness

Geographical distribution and ecological features of the great gerbil subspecies in the main zoonotic cutaneous leishmaniasis foci in Iran

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Asian Pacific Journal of Tropical Medicine 2010年第10期3卷 800-803页

作者： Mohammad Reza Abai Mohammad Ali Oshaghi Leila Tajedin Yavar Rassi amir Ahmad akhavan Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical Sciences

Objective:To reveal subspecies composition of Rhombomy opimus(***) in Iran. Methods:In this study,field specimens of the gerbil were collected from all its geographical rang in northeast and central parts of Iran and identified on basis of morphological ***:Results revealed presence of two subspecies of *** sodalis and R. opimus sargadensis in the *** first subspecies with brown to hazel-nut color and a size bigger than a typical *** was found only in Golestan province,an isolated colony which is located in plains of north slopes of Alborz Chain Mountains of the country,connected with the *** subspecies of *** sargadensis with a yellowish color and similar size as a typical *** was found in all other areas of the great gerbil distribution in *** was a distinct topographic difference but similar ectoparasites between colonies of the two subspecies in the study ***:Further ecological and genetic investigations are required for more detailed description of the *** subspecies range and *** *** papatasi-Leishmania major association and the ZCL severity and outcome in hosts are discussed.

关键词： Rhombomys opimus Great gerbil Ecology Reservoir Leishmaniasis Iran

Morphometric discrimination between females of two isomorphic sand fly species, Phlebotomus caucasicus and Phlebotomus mongolensis(Diptera:Phlebotominae) in endemic and non-endemic foci of zoonotic cutaneous leishmaniasis in Iran

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Asian Pacific Journal of Tropical Medicine 2019年第4期12卷 153-162页

作者： Azad Absavaran Mehdi Mohebali Vahideh Moin-Vaziri Alireza Zahraei-Ramazani amir Ahmad akhavan Fariba Mozaffarian Sayena Rafizadeh Yavar Rassi Department of Medical Entomology and Vector control School of Public Health Tehran University of Medical Sciences Department of Medical Parasitology and Mycology School of Public Health Tehran University of Medical Sciences Department of Medical Parasitology and Mycology School of Medicine Shahid Beheshti University of Medical Sciences Insect Taxonomy Research Department Iranian Research Institute of Plant Protection Ministry of Health and Medical Education

Objective: To delineate reliable morphological characteristics for identifying and separating female Phlebotomus caucasicus and Phlebotomus mongolensis which exist sympatrically in the main foci of zoonotic cutaneous leishmaniasis in ***: Sand flies were collected using sticky trap papers from active colonies of rodent burrows installed from 16 catching sites. Morphometric measurements were analyzed of 87 Phlebotomus caucasicus and 156 Phlebotomus mongolensis. Univariate and multivariate analysis were carried out to determine significant morphometric variables for discrimination of the two species. Finally, seven morphological characteristics of 65 female Phlebotomus caucasicus and 124 female Phlebotomus mongolensis were ***: Univariate and multivariate analyses of 10 morphometric variables via Discriminant Function Analysis(DFA) and Principal Component Analysis(PCA) showed that five morphometric variables had an accuracy of 100% for discriminating female Phlebotomus caucasicus and Phlebotomus mongolensis. Moreover, PCA revealed that the five morphometric variables with the highest loadings separated these two species. Morphological studies on antennal flagellum(and its associated structures) and mouth-parts of female specimens demonstrated significant differences in several ***: The results show that morphological and morphometrical features can be used to discriminate two female isomorphic species, Phlebotomus caucasicus and Phlebotomus mongolensis accurately.

关键词： Leishmaniasis Phlebotomus caucasicus Phlebotomus mongolensis Morphometry Discriminant Functional Analysis Principal Component Analysis Iran

CFD simulation of impeller shape effect on quality of mixing in two-phase gas–liquid agitated vessel

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Chinese Journal of Chemical Engineering 2020年第11期28卷 2733-2745页

作者： amir Heidari Process Simulation and Modeling Laboratory(PSMlab) Faculty of ChemicalPetroleum and Gas EngineeringSemnan UniversitySemnan ***Iran

Mixing efficiency in two-phase gas–liquid agitated vessel is one of the important challenges in the industrial *** fluid dynamics technique(CFD)was used to investigate the effect of four different pitched blade impellers,including 15°,30°,45°and 60°,on the mixing quality of gas–liquid agitated *** multiphase flow behavior was modeled by Eulerian–Eulerian multiphase approach,and RNG k-εwas used to model the *** CFD results showed that a strong global vortex plays the main role on the mixing quality of the gas phase in the *** on the standard deviation criterion,it was observed that the axial distribution of the gas phase in the 30°impeller is about 55%better than the *** addition,the results showed that the 30°impeller has a uniform radial distribution over the other impellers and the maximum gas phase holdup in the *** of the power consumption of the impellers showed that the 30°impeller has the highest power consumption among the other pitched blade ***,examine the effect of same power condition for pitched blade impellers showed that the 30°impeller has the best mixing quality in this condition.

关键词： Pitched blade impeller Mixing CFD Multiphase flow RNG k-εmodel

Diversity of Phlebotomine sand flies(Diptera: Psychodidae) in mountainous and plain areas of an endemic focus of anthroponotic cutaneous leishmaniasis in Iran

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Asian Pacific Journal of Tropical Biomedicine 2020年第5期10卷 201-207页

作者： Saideh Yousefi Ali Reza Zahraei-Ramazani Yavar Rassi Mohammad Reza Aflatoonian Mohammad Reza Yaghoobi-Ershadi Abbas Aghaei-Afshar amir Ahmad akhavan Masoumeh Amin Azim Paksa Department of Medical Entomology and Vector Control School of Public HealthTehran University of Medical SciencesTehranIran Sirjan Faculty of Medical Sciences SirjanIran Research Center of Tropical and Infectious Diseases Kerman University of Medical SciencesKermanIran Leishmaniasis Research Center Kerman University of Medical SciencesKermanIran Department of Parasitology Faculty of MedicineTabriz University of Medical ScienceTabrizIran

Objective: To determine the diversity of sand flies in different biotopes of mountainous and plain areas of Bam County as the most infected focus of anthroponotic cutaneous leishmaniasis in southeast Iran, and synanthropic index of Phlebotomus sergenti Parrot, and Phlebotomus papatasi Scopoli as the main vectors of cutaneous leishmaniasis in ***: Sand flies were captured once a month using sticky traps in domestic, peri-domestic, agricultural, and sylvatic biotopes in the plain and mountainous areas. Alpha diversity indices, including richness, evenness, Shannon-Wiener;beta diversity indices(Jaccard’s and Sorensen’s similarity indices) and synanthropic index were calculated. Results: A total of 2 664 specimens of 9 sand fly species were collected from mountainous(47%) and plain(53%) areas. Species richness, species evenness, and Shannon-Wiener indices were obtained as 9, 0.637, and 1.399, respectively in the mountainous area. Phlebotomus sergenti and Phlebotomus papatasi were constant species with the synanthropic index of-18.463 and-29.412, respectively. In addition, species richness, species evenness, and Shannon-Wiener indices were 4, 0.690, and 0.956, respectively in the plain area. Phlebotomus sergenti and Phlebotomus papatasi were dominant species with the synanthropic index of +9.695 and +36.207, respectively. Similarity indices were low among different biotopes of plain and mountainous ***: A basic knowledge about the diversity of sand flies in various biotopes is essential to design sound control programs. Biodiversity and synanthropic indices of sand flies are different in plain and mountainous areas due to the difference in biotic and abiotic factors between the two areas.

关键词： Sand flies Diversity Richness Evenness Synanthropic index Iran

Phase-plane analysis of test particle orbits in regular black holes

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Communications in Theoretical Physics 2020年第1期72卷 111-117页

作者： Muhammed amir Astrophysics and Cosmology Research Unit School of MathematicsStatistics and Computer ScienceUniversity of KwaZulu-NatalPrivate Bag X54001Durban 4000South Africa

We investigate phase-plane analysis of general relativistic orbits in a gravitational field of the Reissner–Nordstr?m-type regular black hole *** employ phase-plane analysis to obtain different phase-plane diagrams of the test particle orbits by varying charge q and dimensionless parameterβ,whereβcontains angular momentum of the test *** compute numerical values of radii for the innermost stable orbits and corresponding values of energy required to place the test particle in *** on,we employ similar analysis on an Ayón–Beato–García(ABG)regular black hole and a comparison regarding key results is also included.

关键词： black holes modified gravity phase-plane diagrams

Computer-aided design of classical linear compensators with application to aerospace

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Journal of Systems Engineering and Electronics 2009年第6期20卷 1373-1377页

作者： amir Nassirharand School of Mechanical Manufacturing & Materials Engineering Univ.of Nottingham-Malaysia Campus Semenyih 43500 Malaysia

A new Matlab function based on a versatile compensator design approach is *** function allows design of lead-lag, PID, proportional plus rate feedback, proportional-integral plus rate feedback, and nth order linear *** primary inputs to this function are the plant transfer function and the desired closedloop behavior in terms of an nth order transfer *** output is the particular compensator *** unified design approach is primarily based on minimizing a mean-squared error type objective *** minimization gives the compensator parameters in terms of a set of linear simultaneous algebraic *** solution method requires the user to input such parameters as the lower and upper limits of frequency range of interest;such parameters are automatically determined by the use of numerical *** design method and the associated software are demonstrated by solving a flexible satellite problem, and the results are compared with those obtained by two other methods reported in the open literatures.

关键词： linear systems classical control numerical analysis optimization.

Multi-range controller design for highly nonlinear systems with application to unmanned aerial vehicles

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Journal of Systems Engineering and Electronics 2010年第3期21卷 491-495页

作者： amir Nassirharand School of Mechanical Manufacturing & Materials EngineeringUniversity of Nottingham-Malaysia Campus

A new procedure for a design of multi-range controllers for use with highly nonlinear systems is *** procedure involves obtaining the describing function models of the nonlinear plant by software followed by designing a controller at nominal ***,the controller parameters are optimized to yield a satisfactory closed-loop response at all operating ***,the performance and stability of the closed-loop system comprised of the designed controller and the nonlinear plant are *** procedure and the associated software are applied to a nonlinear control problem of the sort encountered in aerospace,and the results are compared with two other approaches.

关键词： control theory optimization describing functions Fourier analysis stabilization.

General Energy Decay of Solutions for a Weakly Dissipative Kirchhoff Equation with Nonlinear Boundary Damping

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Acta Mathematicae Applicatae Sinica 2017年第2期33卷 401-408页

作者： amir Peyravi Department of Mathematics College of Sciences Shiraz University Shiraz 71467-13565 Iran

In this article, we study the weak dissipative Kirchhoff equation under nonlinear damping on the boundary We prove a general energy decay property for solutions in terms of coefficient of the frictional boundary damping. Our result extends and improves some results in the literature such as the work by Zhang and Miao （2010） in which only exponential energy decay is considered and the work by Zhang and Huang （2014） where the energy decay has been not considered.

关键词： Kirchhoff equation general decay boundary damping