Military Academy

About: Military Academy is a based out in . It is known for research contribution in the topics: Population & Context (language use). The organization has 2478 authors who have published 3003 publications receiving 33188 citations.

A new digital signature scheme based on chaotic maps

Abstract: In the present e-commerce and e-government era, digital signatures have become more and more important. Digital signature algorithms can be categorized based on the type of security suppositions, for example discrete logarithm, factorization hard-problems, and elliptic curve cryptography, which are all currently believed to be unsolvable in a reasonable time period. Recently, cryptosystems based on chaotic maps have been proposed. Due to some subtle and close relationships between the properties of traditional cryptosystems and chaotic systems, the idea of chaotic systems with applications to cryptography has received a great deal of attention from researchers from a variety of disciplines. Therefore, to enhance system security, we explore the implementation of a digital signature algorithm based on both cryptographic and chaotic system characteristics. We also give a proof that the security of the proposed scheme can protect against the known key attacks.

Optimal FSW process parameters for aluminum alloys AA5083

Abstract: Friction stir welding (FSW) can produce superior mechanical properties in the weld zone. The purpose of this article is to find the optimum FSW process operating conditions for two plates of aluminum alloy AA5083 welded in butt joint. In addition to optimizing the performance characteristics, the cost is considered in the optimal FSW process. In the FSW procedure, there are four major controllable four-level factors, i.e. the tool rotation speed, transverse speed (feed rate), tool tilt angle with respect to the workpiece surface, and pin tool length. The uncontrollable factors are the ultimate tensile strength and elongation rate which can be converted to signal-to-noise ratios the larger the better. In order to achieve the aim of robustness in the multiple response process, the gray-based Taguchi method is proposed. A gray relational grade obtained from gray relational analysis is used as the multiple performance characteristic. The resulting optimum process parameters are rotation speed at 1800 rpm, tra...

Influence of the delta-aminolevulinic acid dehydratase (ALAD) polymorphism on biomarkers of lead exposure in Turkish storage battery manufacturing workers.

Abstract: Background The relationship between delta-aminolevulinic acid dehydratase polymorphism(ALAD)andbiomarkersofexposurewasinvestigatedinTurkishleadworkersin this study. Methods Seventy two male lead battery manufacturing workers were selected for the study. Blood lead (BPb) and urinary lead (UPb) concentrations were determined by atomic absorption spectrometry. Erythrocyte ALAD activity and urinary 5-aminolevulinic acid (UALA) were measured spectrophotometrically. The polymerase chain reactionrestriction fragment length polymorphism (PCR-RFLP) technique was used to determine the genotype of the ALAD gene. Results In total, 51 workers (70.8%) had the ALAD 1-1 genotype, whereas 21 workers (29.2%) had the ALAD 1-2 genotype. No significant relationships were found between the two genotypes and BPb, UPb, and ALAD activity. ALAD1 homozygotes showed significantly higher levels of UALA in comparison with those ALAD2 carriers. Conclusions ALAD 1-1 individuals might be an increased risk compared to ALAD2 carriers to disturbance in heme biosynthetic pathway in high lead exposure. Am. J. Ind. Med. 43:165–171, 2003. 2003 Wiley-Liss, Inc.

Effects of oxygen partial pressure on the preferential orientation and surface morphology of ITO films grown by RF magnetron sputtering

Abstract: In this study, effects of oxygen pressure in the sputtering ambient on the preferential orientation and resultant surface morphology of ITO films grown by RF magnetron sputtering were investigated. ITO film grown with pure Ar gas shows a preferential (400) plane orientation parallel to the substrate surface and a sawteeth-shaped rough surface. ITO film grown in the sputtering ambient of Ar and oxygen mixtures shows a preferential (222) plane orientation and a flat and smooth surface. The differences in the growth rate, surface morphology, and roughness between the preferentially orientated films were discussed in terms of the surface energy of planes. The electrical and optical properties of the films were examined.