Hybrid Algorithm to Detect DDoS Attacks in VANETs

Wireless Personal Communications - Security and safety are fundamental issues in any wireless network. The problem becomes serious when the specified network is Vehicular Adhoc Network (VANET)....     

Photoconductive properties of some chemically deposited (Cd–Pb)s films

Films of (Cd–Pb)S have been prepared using chemical deposition in aqueous alkaline bath and their subsequent condensation on substrates. Important achievements in terms of electrical response, optical absorption and photoconductivity (PC) excitation spectra, SEM, XRD and photoluminescence (PL) studies are presented and discussed. From the photocurrent curves, the ratio I_PC (saturated photocurrent)/I_DC (dark current) was observed to be of the order of 10⁶ for the systems prepared with CdCl₂, and to be 10⁷ when doped with samarium nitrate. Values of trap depth E, lifetime and mobility are evaluated from the PC decay. Band-gaps are determined from the two spectra. Diffraction lines in XRD studies are associated to CdS and PbS, and according to SEM studies layered growth of the films takes place. PL of samarium doped (Cd–Pb)S films shows an emission peak in the green-yellow region under 365?nm excitation. The PL brightness decreases with temperature.     

Sensitive enantioseparation and determination of isoprenaline in human plasma and pharmaceutical formulations

A simple, sensitive and fast RPHPLC method was developed and validated for the enantioselective determination of (RS)‐isoprenaline (Ipn) in human plasma. The enantiomers were converted to diastereomeric derivatives using s‐triazine (cyanuric chloride) based chiral derivatizing reagents. l ‐isoleucine and l ‐methionine were introduced as chiral auxiliary in s‐triazine and two new monochloro‐s‐triazine reagents were synthesized. These reagents were characterized and used for synthesis of diastereomeric derivatives of (RS)‐Ipn spiked in human plasma. (RS)‐Ipn was isolated (purified and characterized) from a commercial pharmaceutical formulation and was used as the standard racemic sample. Structures of the two diastereomeric derivatives were optimized for lowest energy using the Gaussian 09 Rev A. 02 program and hybrid density functional B3LYP with 6‐31G* basis set which showed the spatial orientation of hydrophobic groups on stereogenic centers in the diastereomeric derivatives. The results were correlated with the mechanism of separation and elution order. Limit of detection values were found to be 24.6 and 26.8 ng mL^?1 for the first and second eluting diastereomeric derivatives, respectively.     

Thin-Layer Chromatographic Enantioresolution of (RS)-Ketorolac Using L-Amino Acids as Chiral Additive in Stationary Phase

JPC – Journal of Planar Chromatography – Modern TLC - Direct resolution of enantiomers of (RS)-ketorolac was achieved by thin-layer chromatography on silica gel plates using...     

Evaluating the Performance of Various SVM Kernel Functions Based on Basic Features Extracted from KDDCUP'99 Dataset by Random Forest Method for Detecting DDoS Attacks

Wireless Personal Communications - Currently the rapid development of technology is taking place in the field of cloud computing. Cloud computing environment is the very demanding. It is easily...     

Comparative application of microwave,ultrasonication, ultracentrifugation and conventional heating for preparation of sample as dinitrophenyl derivative for direct enantioseparation of certain amino alcohols and 1-amino-2-propanol from vitamin B12 hydrolysate on α1-acid glycoprotein and β-cyclodextrin columns

Taking into account the structural similarities of amino alcohols with amino acids and in order to reduce time for derivatization unconventional approaches viz. microwave irradiation, ultrasonication and ultra centrifugation were applied for synthesis of dinitrophenyl derivatives of nine amino alcohols and to work out a method of choice for sample preparation for direct enantioseparation. The enantiomeric dinitrophenyl derivatives so synthesized were separated on α₁-acid glycoprotein and β-cyclodextrin columns with detection at 230 nm using photodiode array detection system. Derivatization methods and chromatographic parameters were optimized. β-Cyclodextrin column was found better compared to AGP column for enantioseparation. Limit of detection, quantification, accuracy and precision were also determined. The developed method was successfully applied to determine enantiomeric purity of 1-amino-2-propanol obtained from vitamin B₁₂ hydrolysate.     

Design of rate-compatible structured LDPC codes for hybrid ARQ applications

In this paper, families of rate-compatible protograph-based LDPC codes that are suitable for incrementalredundancy hybrid ARQ applications are constructed. A systematic technique to construct low-rate base codes from a higher rate code is presented. The base codes are designed to be robust against erasures while having a good performance on error channels. A progressive node puncturing algorithm is devised to construct a family of higher rate codes from the base code. The performance of this puncturing algorithm is compared to other puncturing schemes. Using the techniques in this paper, one can construct a rate-compatible family of codes with rates ranging from 0.1 to 0.9 that are within 1 dB from the channel capacity and have good error floors.     

Reversed-phase high-performance liquid chromatographic, gel electrophoretic and size exclusion chromatographic studies of subunit structure of arachin and its molecular species

Arachin and its molecular species (arachin I and arachin II) were separated and isolated. The number and kind of subunits of arachin, arachin I and arachin II were determined. Studies were carried out under different experimental conditions using slab gel electrophoresis, size-exclusion chromatography and reversed-phase high-performance liquid chromatography. Gel electrophoresis was done under varying concentrations of resolving gel. Tube gel as well as slab gel electrophoresis were used and continuous as well as discontinuous buffer systems were used for both types of electrophoresis. In addition, the subunits were separated by reversed-phase HPLC using a gradient program. Arachin and arachin II were found to have 12 subunits each while arachin I showed six subunits. The subunits of arachin I were allowed to reconstitute by removing SDS. Eight combinations were tried for studying the reconstitution pattern. Molecular weight and weight ratio in each case were also determined.     

Handcrafted fuzzy rules for tissue classification

This article proposes a handcrafted fuzzy rule-based system for segmentation and identification of different tissue types in magnetic resonance (MR) brain images. The proposed fuzzy system uses a combination of histogram and spatial neighborhood-based features. The intensity variation from one type of tissue to another is gradual at the boundaries due to the inherent nature of the MR signal (MR physics). A fuzzy rule-based approach is expected to better handle these variations and variability in features corresponding to different types of tissues. The proposed segmentation is tested to classify the pixels of the T2-weighted axial MR images of the brain into three primary tissue types: white matter, gray matter and cerebral-spinal fluid. The results are compared with those from manual segmentation by an expert, demonstrating good agreement between them.     

Photo- and electroluminescence of undoped and rare earth doped ZnO electroluminors

A series of undoped and rare earth (Dy, Yb, Nd, Pr, Gd, La, Sm and Er) doped ZnO electroluminors have been prepared and their photo-(PL) and electroluminescence (EL) spectra at different concertrations of rare earth ions have been investigated. PL and EL spectra of undoped electroluminors consist of three peaks. Due to the addition of the rare earth ions these peaks are shifted either to the longer or to the shorter wavelength side. The intensities are also either decreased or increased. Experimental results favour the donor—acceptor model for this system.