Efficient Image Chaotic Encryption Algorithm with No Propagation Error

Abir Awad,Dounia Awad 한국전자통신연구원 2010 ETRI Journal Vol.32 No.5

Many chaos-based encryption methods have been presented and discussed in the last two decades, but very few of them are suitable to secure transmission on noisy channels or respect the standard of the National Institute of Standards and Technology (NIST). This paper tackles the problem and presents a novel chaos-based cryptosystem for secure transmitted images. The proposed cryptosystem overcomes the drawbacks of existing chaotic algorithms such as the Socek, Xiang, Yang, and Wong methods. It takes advantage of the increasingly complex behavior of perturbed chaotic signals. The perturbing orbit technique improves the dynamic statistical properties of generated chaotic sequences, permits the proposed algorithm reaching higher performance, and avoids the problem of error propagation. Finally, many standard tools, such as NIST tests, are used to quantify the security level of the proposed cryptosystem, and experimental results prove that the suggested cryptosystem has a high security level, lower correlation coefficients, and improved entropy.

Integrated Roll-Pitch-Yaw Autopilot via Equivalent Based Sliding Mode Control for Uncertain Nonlinear Time-Varying Missile

AWAD, Ahmed,WANG, Haoping The Korean Society for Aeronautical and Space Scie 2017 International Journal of Aeronautical and Space Sc Vol.18 No.4

This paper presents an integrated roll-pitch-yaw autopilot using an equivalent based sliding mode control for skid-to-turn nonlinear time-varying missile system with lumped disturbances in its six-equations of motion. The considered missile model are developed to integrate the model uncertainties, external disturbances, and parameters perturbation as lumped disturbances. Moreover, it considers the coupling effect between channels, the variation of missile velocity and parameters, and the aerodynamics nonlinearity. The presented approach is employed to achieve a good tracking performance with robustness in all missile channels simultaneously during the entire flight envelope without demand of accurate modeling or output derivative to avoid the noise existence in the real missile system. The proposed autopilot consisting of a two-loop structure, controls pitch and yaw accelerations, and stabilizes the roll angle simultaneously. The Closed loop stability is studied. Numerical simulation is provided to evaluate performance of the suggested autopilot and to compare it with an existing autopilot in the literature concerning the robustness against the lumped disturbances, and the aforesaid considerations. Finally, the proposed autopilot is integrated in a six degree of freedom flight simulation model to evaluate it with several target scenarios, and the results are shown.

OPTIMAL PRESSURE REGULATION IN WATER DISTRIBUTION NETWORKS USING SELF-ORGANIZING MAPS

AWAD HAYTHAM,KAWAMURA AKIRA,JINNO KENJI 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1

Effects of heat stress on growth performance, selected physiological and immunological parameters, caecal microflora, and meat quality in two broiler strains

Awad, Elmutaz Atta,Najaa, Muhamad,Zulaikha, Zainool Abidin,Zulkifli, Idrus,Soleimani, Abdoreza Farjam Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.5

Objective: This study was conducted to investigate the effects of normal and heat stress environments on growth performance and, selected physiological and immunological parameters, caecal microflora and meat quality in Cobb 500 and Ross 308 broilers. Methods: One-hundred-and-twenty male broiler chicks from each strain (one-day-old) were randomly assigned in groups of 10 to 24 battery cages. Ambient temperature on day (d) 1 was set at 32℃ and gradually reduced to 23℃ on d 21. From d 22 to 35, equal numbers of birds from each strain were exposed to a temperature of either 23℃ throughout (normal) or 34℃ for 6 h (heat stress). Results: From d 1 to 21, strain had no effect (p>0.05) on feed intake (FI), body weight gain (BWG), or the feed conversion ratio (FCR). Except for creatine kinase, no strain×temperature interactions were observed for all the parameters measured. Regardless of strain, heat exposure significantly (p<0.05) reduced FI and BWG (d 22 to 35 and 1 to 35), immunoglobulin Y (IgY) and IgM, while increased FCR (d 22 to 35 and 1 to 35) and serum levels of glucose and acute phase proteins (APPs). Regardless of temperature, the Ross 308 birds had significantly (p<0.05) lower IgA and higher finisher and overall BWG compared to Cobb 500. Conclusion: The present study suggests that the detrimental effects of heat stress are consistent across commercial broiler strains because there were no significant strain×temperature interactions for growth performance, serum APPs and immunoglobulin responses, meat quality, and ceacal microflora population.

Biochar, a potential hydroponic growth substrate, enhances the nutritional status and growth of leafy vegetables

Awad, Y.M.,Lee, S.E.,Ahmed, M.B.M.,Vu, N.T.,Farooq, M.,Kim, I.S.,Kim, H.S.,Vithanage, M.,Usman, A.R.A.,Al-Wabel, M.,Meers, E.,Kwon, E.E.,Ok, Y.S. Butterworth-Heinemann, Ltd 2017 Journal of cleaner production Vol.156 No.-

A hydroponics system developed using a nutrient film technique was used to evaluate the effectiveness of rice husk biochar (RB) alone or in combination with perlite (PL) as substrates for increasing the growth of leafy vegetables compared with that of PL. Seedlings of cabbage, dill, mallow, red lettuce, and tatsoi were grown hydroponically in PL, RB, and PL + RB (1:1 ratio of PL to RB, v/v) substrates for a 30-d under optimal environmental conditions in a greenhouse. Shoot length and fresh/dry masses of cabbage, dill, and red lettuce plants grown in RB substrate were decreased by 49% on average compared to those plants grown in PL substrate. In contrast, PL + RB substrate led to approximately 2-fold increases in shoot length, number of leaves, and fresh/dry masses of leafy vegetable plants compared with those grown in PL substrate. Foliar nutritional composition (Ca, Mg, K, Na, Mn, Fe, and Zn) and nitrogen status (SPAD index) of plants grown in PL + RB and PL substrates suggested the presence of optimal growth conditions for ensuring optimum yield with high quality. In addition, RB substrate contributed to respective increases of 1.2-3.5-fold in leaf K, Mg, Mn, and Zn contents in most vegetable plants compared with those grown in PL substrate. The RB alone or in combination with PL substrates decreased algal growth in the nutrient solutions as confirmed by scanning electron micrographs of microalgae on the RB surface. The results also indicated that use of PL + RB hydroponic substrate could be an alternative and effective technology for the better management of unwanted algal growth in nutrient solutions and high production of leafy vegetables.

Scalable Scenario Specifications to Synthesize Component-centric Behaviour Models

Awad Ali,Dayang N. A. Jawawi,Mohd Adham Isa 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.9

Several scenario description languages and associated behaviour synthesis processes have been developed. The goal of these is to synthesize behaviour models from system requirement specifications, in order to enable the early identification of weak design spots or code generation. To date, however, most of the scenario languages are poorly scaled with regards to system sizes. This is because scalability requires more expressive constructs that can help when writing a scenario specification in a concise and compact manner, thereby resulting in a reduced number of scenarios. Furthermore, due to a lack of expressiveness in scenario languages, synthesis algorithms may need to rely on global behaviour models to determine inter-scenario dependencies. The global model is an additional factor that limits the approaches’ scalability. The reason is that the construction of a global model becomes harder as the system specification increases. To tackle these issues, within this article is proposed an expressive scenario description language that provides a concise and compact approach to scenario description, and defines inter-scenario dependencies semantically. A new algorithm that can address the additional constructs of the language was defined, in order to synthesize component-centric behaviour models. The applicability of this work has been demonstrated through both an illustrative example and a real-world case study. The evaluation indicates that the proposed scenario description language is more scalable than existing languages.

Response of fiber reinforced plastic chimneys to wind loads

Awad, A.S.,El Damatty, A.A.,Vickery, B.J. Techno-Press 2000 Wind and Structures, An International Journal (WAS Vol.3 No.2

Due to their high corrosion and chemical resistance, fiber reinforced plastics (FRP) are becoming widely used as the main structural material for industrial chimneys. However, no national code currently exists for the design of such type of chimneys. The purpose of this study is to investigate analytically the response of FRP chimneys to wind loads. The classical lamination theory is used to substitute the angle-ply laminate of a FRP chimney with an equivalent orthotropic material that provides the same stiffness. Dynamic wind loads are applied to the equivalent chimney to evaluate its response to both along and across wind loads. A parametric study is then conducted to identify the material and geometric parameters affecting the response of FRP chimneys to wind loads. Unlike the across-wind response, the along-wind tip deflection is found to be highly dependent on the angle of orientation of the fibers. In general, the analysis shows that FRP chimneys are very vulnerable to across-wind oscillations resulting from the vortex shedding phenomenon.

NEW SERIES IDENTITIES FOR ${\frac{1}{\Pi}}$

Awad, Mohammed M.,Mohammed, Asmaa O.,Rakha, Medhat A.,Rathie, Arjun K. Korean Mathematical Society 2017 대한수학회논문집 Vol.32 No.4

In the theory of hypergeometric and generalized hypergeometric series, classical summation theorems have been found interesting applications in obtaining various series identities for ${\Pi}$, ${\Pi}^2$ and ${\frac{1}{\Pi}}$. The aim of this research paper is to provide twelve general formulas for ${\frac{1}{\Pi}}$. On specializing the parameters, a large number of very interesting series identities for ${\frac{1}{\Pi}}$ not previously appeared in the literature have been obtained. Also, several other results for multiples of ${\Pi}$, ${\Pi}^2$, ${\frac{1}{{\Pi}^2}}$, ${\frac{1}{{\Pi}^3}}$ and ${\frac{1}{\sqrt{\Pi}}}$ have been obtained. The results are established with the help of the extensions of classical Gauss's summation theorem available in the literature.

South Korea cultural and Economic Cooperation with Africa:The Case of the Sudan

Awad Al-Sid Al-Karsani 한국중동학회 2000 韓國 中東 學會 論叢 Vol.21 No.2

Effects of polyacrylamide, biopolymer, and biochar on decomposition of soil organic matter and plant residues as determined by ¹⁴C and enzyme activities

Awad, Y.M.,Blagodatskaya, E.,Ok, Y.S.,Kuzyakov, Y. Gauthier-Villars ; Elsevier Science Ltd 2012 European journal of soil biology Vol.48 No.-

Application of polymers for the improvement of aggregate structure and reduction of soil erosion may alter the availability and decomposition of plant residues. In this study, we assessed the effects of anionic polyacrylamide (PAM), synthesized biopolymer (BP), and biochar (BC) on the decomposition of <SUP>14</SUP>C-labeled maize residue in sandy and sandy loam soils. Specifically, PAM and BP with or without <SUP>14</SUP>C-labeled plant residue were applied at 400 kg ha<SUP>-1</SUP>, whereas BC was applied at 5000 kg ha<SUP>-1</SUP>, after which the soils were incubated for 80 days at 22 <SUP>o</SUP>C. Initially, plant residue decomposition was much higher in untreated sandy loam soil than in sandy soil. Nevertheless, the stimulating effects of BP and BC on the decomposition of plant residue were more pronounced in sandy soil, where it accounted for 13.4% and 23.4% of <SUP>14</SUP>C input, respectively, whereas in sandy loam soil, the acceleration of plant residue decomposition by BP and BC did not exceed 2.6% and 14.1%, respectively, compared to untreated soil with plant residue. The stimulating effects of BP and BC on the decomposition of plant residue were confirmed based on activities of β-cellobiohydrolase, β-glucosidase, and chitinase in both soils. In contrast to BC and BP, PAM did not increase the decomposition of native or added C in both soils.