Security of medical images for telemedicine: a systematic review

Multimedia Tools and Applications - Recently, there has been a rapid growth in the utilization of medical images in telemedicine applications. The authors in this paper presented a detailed...     

Single crystalline Co3O4: Synthesis and optical properties

Crystals of Co₃O₄ have been prepared from thermal decomposition of molecular precursors derived from salicylic acid and cobalt (II) acetate or chloride at 500 °C. A cubic phase Co₃O₄ micro- and nanocrystals have been obtained. The as-synthesized products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The images of electron microscopes showed octahedral crystals of Co₃O₄. The volume and polarizability of the optimized structures of molecular precursors have been calculated and related to the particle size. The optical band gap of the obtained crystals has been measured. The results indicated two optical band gaps with values 2.65 and 2.95 eV for (E_g1) (E_g2), respectively.     

Fast computation of accurate Gaussian–Hermite moments for image processing applications

Gaussian–Hermite moments are orthogonal moments widely used in image processing and computer vision applications. Similar to the other families of orthogonal moments, highly computational demands represent the main challenging. In this work, an efficient method is proposed for fast computation of highly accurate Gaussian–Hermite moments for gray-level images. The proposed method achieves the accuracy through the integration of Gaussian–Hermite polynomials over the image pixels. To achieve the efficiency, the symmetry property of Gaussian–Hermite polynomials is employed where the computational complexity is reduced by 75%. Fast computational methodology is employed to significantly accelerate the computational process where the 2D Gaussian–Hermite moments are treated in a separated form. Numerical experiments are performed where the results are compared with the conventional method. The comparison of the obtained results clearly ensures the efficiency of the proposed method.     

Effect of polyox drag reducing polymer on the Diffusion Controlled Corrosion of agitated vessels

The effect of the additions of polyethelene oxide (Polyox) on the rate of dissolution of the copper wall of an agitated vessels in acidified FeCl₃ solutions was determined by measuring the weight loss and the increase of Cu⁺⁺ concentration with time using iodometry. Variables studied were polymer concentration and impeller rotation speed. Polymer addition was found to decrease the rate of diffusion controlled corrosion of copper in acidified FeCl₃ by about 25%. The decrease in the rate of corrosion was found to be insensitive to polymer concentration and impeller rotation speed. Practical implications of using drag reducing polymers to combat corrosion and decrease power consumption in agitated vessels were noted.     

Multiport approach for the analysis of microwave non-linear networks

The state and output equations of the overall networks are derived from the state and output equations of individual multiports and knowledge of the interconnections between them. A generalized lumped-distributed L/D multiport is described by its associated state, output and non-linear equations in the time domain. Any network can be considered as composed of a set of multiports and independent sources. These equations have been incorporated into a computer-aided procedure for the analysis of L/D networks. The procedure can be used for the simulation of any non-linear microwave circuit and offers the facility of developing a multiport equivalent circuit for any linear or non-linear device or subcircuit. Several examples are successfully analysed using the developed general program.     

Prediction-based secured handover authentication for mobile cloud computing

Mobile cloud computing (MCC) is a new technology that brings cloud computing and mobile networks together. It enhances the quality of service delivered to mobile clients, network operators, and cloud providers. Security in MCC technology, particularly authentication during the handover process, is a big challenge. Current vertical handover authentication protocols encounter different problems such as undesirable delays in real-time applications, the man in the middle attack, and replay attack. In this paper, a new authentication protocol for heterogeneous IEEE 802.11/LTE-A mobile cloud networks are proposed. The proposed protocol is mainly based on the view of the 3GPP access network discovery and selection function, which uses the capacities given by the IEEE 802.11 and the 3GPP long term evolution-advanced (LTE-A) standards interconnection. A prediction scheme, with no additional load over the network, or the user is utilized to handle cloud computing issues arising during authentication in the handover process. The proposed handover authentication protocol outperformed existing protocols in terms of key confidentiality, powerful security, and efficiency which was used to reduce bandwidth consumption.

     

Effect of bioadhesive polymers,sodium salicylate,polyoxyethylene-9-lauryl ether,and method of preparation on the relative hypoglycemia produced by insulin enteric-coated capsules in diabetic beagle dogs

The hypoglycemic effect of oral insulin capsules coated with pH-dependent Eudragit® S100 and containing various absorption promoters was studied in hyperglycemic beagle dogs. The absorption enhancers used were bioadhesive polymers, sodium salicylate, and non-ionic surfactants. A comparative study of the bioadhesive polymers, polycarbophil (PC), hydroxypropyl methylcellulose (HPMC), and carbopol 934 in insulin-coated capsules revealed no significant difference between the insulin capsules containing these polymers, giving relative hypoglycemia (RH) values ranging from 4.3±2.3% to 6.5±5.1%. It was also found that the method of preparation of the mixture of the bioadhesive polymer with insulin either by physical mixing or freeze-drying did not affect the RH values obtained. Sodium salicylate, when used in insulin enteric-coated capsules (50 mg) mixed with insulin as a physical mixture, or prepared by wet granulation using 10% polyvinyl pyrollidone (PVP), or by freeze-drying, produced RH values ranging from 7.3±2.9% to 9.4±3.7%. When sodium salicylate (100 mg) was used with insulin in freeze-dried granules an RH value of 10±2.6% was produced. As the dose of insulin increased from 6 to 9 U/kg, the area under curve (AUC) of the enteric-coated capsules containing 50 mg sodium salicylate increased from 73.2±27.8% to 121.4±102.7% reduction, but the RH did not change significantly. Insulin capsules containing polyoxyethylene-9-lauryl ether (POELE) used in its optimum concentration (2%), found in these experiments, produced RH of 9.5±6.8% when prepared as granules by wetting with a few drops of absolute alcohol in the presence of PC (50 mg). Insulin capsules containing lower (1%) or higher (3%) concentrations of POELE and prepared with PC, 50 mg by wet granulation produced lower RH of about 6%. The enteric-coated oral insulin capsules containing insulin (6 or 9 U/kg) and sodium salicylate (50 mg) as an absorption promoter, together with the bioadhesive polymer polycarbophil (50 mg), and prepared either by wet granulation using ethanol or by freeze-drying, are the best formulations to be used. They achieved a reduction in plasma glucose levels of about 25-30% and RH of about 10%. Also insulin (9 U/kg) capsules containing 2% POELE produced a 28% reduction in plasma glucose levels and RH of 9.6±6.8%.