Synthesis of arbitrarily shaped radiation patterns using linear antenna arrays has a significant importance in many applications. Many attempts based on analytical schemes are exerted for this purpose. However, these analytical methods are developed for specific problems, and usually synthesis of the radiation pattern is subject to only one restriction. On the other hand, optimization algorithms are utilized for more general problems. However, these algorithms require more computational time. In this letter, a new hybrid technique for synthesizing arbitrary-shaped radiation pattern using a linear array is developed. The algorithm is based on a combination between the method of moments (MoM) and the genetic algorithm (GA). The proposed algorithm is applied to synthesis of both symmetric and asymmetric radiation pattern distributions with minimum number of elements. Excellent agreement is obtained by comparison to other analytical and optimization techniques.Index Terms-Genetic algorithm (GA), linear array, method of moments (MoM).

Many attempts have been made to investigate the classical heat transfer of Fourier, and a number of improvements have been implemented. In this work, we consider a novel thermoelasticity model based on the Moore–Gibson–Thompson equation in cases where some of these models fail to be positive. This thermomechanical model has been constructed in combination with a hyperbolic partial differential equation for the variation of the displacement field and a parabolic differential equation for the temperature increment. The presented model is applied to investigate the wave propagation in an isotropic and infinite body subjected to a continuous thermal line source. To solve this problem, together with Laplace and Hankel transform methods, the potential function approach has been used. Laplace and Hankel inverse transformations are used to find solutions to different physical fields in the space–time domain. The problem is validated by calculating the numerical calculations of the physical fields for a given material. The numerical and theoretical results of other thermoelastic models have been compared with those described previously.

Hash functions are considered as the core of cryptography, which are the basic technique used for data security. Cryptographic hash functions also can be used to achieve the integrity of large data such as the data stored in a hard disk and set of financial data. So, in the era of large data and increasing capacity of data in applications, fast hash schemes with parallel operations are extremely desirable which effectively increases the computational speed. Functions of random behavior like chaotic maps are used in hash functions to generate the fixed length message digest from the original message. This paper proposes a parallel hash algorithm based on multiple chaotic functions by mixing logistic map, tent map, and sine function. In the proposed scheme the structure of coupling lattice is changed and using diamond lattice as new structure. This algorithm is flexible to generate 128, 256 or longer hash value. The simulation analysis such as hash distribution, key sensitivity, confusion and diffusion statistical properties, and collision resistance are executed. The results demonstrated that the proposed hash is an efficient, simple and fast algorithm comparing with some recent hash algorithms based on chaotic maps.

Introduction: Inflammatory pseudotumor (IPT) is a rare benign disease which presents as tumor like mass mimicking malignancy. The most common sites are lungs, liver, orbits and gastrointestinal tract. Splenic IPT is very rare. Presentation of Case:A 41-year-old woman presented with the complaints of left upper quadrant pain radiating to the back for a year. Abdominal ultrasound and computed tomography (CT) revealed a hypodense lesion of approximately 5 cm located in the splenic parenchyma near the hilum. Hydatid serology was negative. The patient was treated with splenectomy due to diagnostic dilemma and final diagnosis of IPT was made on histopathological examination of the resected spleen.Discussion: Splenic IPT usually affects middle aged women presenting as incidental finding on abdominal imaging.It is most often isolated but at times may be associated with IPT at other sites probably suggesting a systemic etiology. Radiological findings are non-specific leading to diagnostic dilemma. Splenectomy is useful for treating symptomatic cases and helps in making the accurate diagnosis in cases of diagnostic dilemma. Conclusion:Splenic IPT is a rare, benign condition which should be included in the differential diagnosis while evaluating a splenic mass.

Encryption of medical image is very important subject especially in wireless body area networks (WBAN) applications where the devices have many limitations in memory size, energy and computation capabilities. In this paper an image encryption scheme is introduced to be suitable for this limitations. The scheme consists of two phases. Firstly, the patient information (as name, age, ..etc) is hidden in the patient medical image (as x-ray, MRI, ..etc) using Least Signification Bit technique to reduce the capacity of data encrypted and make this information visually unavailable to unauthorized personnel. Secondly, the patient’s medical image is encrypted using DNA coding rules and a new multi chaotic map system. DNA coding improves computational speed and provides large capacity for data transmission while the new multi chaotic map consists by merging Henon, Sin and Ten map (HST) to produces pseudo random sequences with more chaotic characteristics. Results show that this scheme has a good peak signal to noise ratio, low correlation, huge key space, key-dependent pixel value replacement and can resist statistical and differential attacks.

No abstract

No abstract

No abstract