Analysis of threats and security issues evaluation in mobile P2P networks

Technically, mobile P2P network system architecture can consider as a distributed architecture system (like a community), where the nodes or users can share all or some of their own software and hardware resources such as (applications store, processing time, storage, network bandwidth) with the other nodes (users) through Internet, and these resources can be accessible directly by the nodes in that system without the need of a central coordination node. The main structure of our proposed network architecture is that all the nodes are symmetric in their functions. In this work, the security issues of mobile P2P network system architecture such as (web threats, attacks and encryption) will be discussed deeply and then we propose different approaches and we analysis and evaluation of these mobile P2P network security issues and submit some proposal solutions to resolve the related problems with threats and other different attacks since these threats and attacks will be serious issue as networks are growing up especially with mobility attribute in current P2P networks

The Effect of Gender on the Bilingual and Bicultural Identity of the Iraqi EFL Learners' Recognition and Production of Request

This study examines the effect of gender on students' bilingual and bicultural identity in their recognition and production of request is studied. This means that it investigates to what extent the learners’ mother tongue and culture influence their recognition and production of request in the EFL and the effect of gender on such an identity. The study aims at exploring and identifying the linguistic patterns of request in English used by Iraqi EFL learners, those patterns of request transferred from Iraqi EFL learners’ mother tongue, and the Iraqi EFL learners’ cultural patterns and cultural realization of request transferred from Arabic culture into the EFL. Some hypotheses of the study state that there is a bilingual and cultural identity in using request by Iraqi EFL learners, females are better than males in request perception and production and they are worse in Arabic monolingualism and monoculturalism, students are better in English monolingualism and monoculturalism than in the other request features, students’ English monolingual and monocultural identity is more apparent in request perception than in production. To validate or refute its hypotheses, a test comprising recognition and production has been constructed and applied to fifty Iraqi EFL learners at fourth year, Department of English, College of Education for Humanities, University of Thi-Qar at the academic year (2020-2021). After data analysis, some conclusions are arrived at. The study concludes that Iraqi EFL learners are pragmatically incompetent and they have a bilingual and bicultural identity because of their mother tongue and culture interference

On (ɱ,ɳ)-Strongly Fully Stably Banach Algebra Modules Related to an Ideal of Am ×ɳ

في هذا البحث تم دراسة مفهوم مقاسات بناخ الاجبرا تام الاستقراية من النمط (ɱ,  ) بالنسبة الى مثالي Am ×ɳ و دراسة بعض خواصه.قد تم برهنت العديد من العلاقات منها يكون المقاس X  تام الاستقرارية من النمط (ɱ,ɳ) بالنسبة الى مثالي  اذا وفقط اذا لاي محموعتين جزئيتين من العناصر من النمط ɱ  و  من Ӽɳ و ادا كان  لكل j = 1, …, ɱ,  i = 1,…, ɳ و  و  يؤدي الى Ạɳ( ) Ạɳ(The aim of this paper is introducing the concept of (ɱ,ɳ) strong full stability B-Algebra-module related to an ideal. Some properties of (ɱ,ɳ)- strong full stability B-Algebra-module related to an ideal have been studied and another characterizations have been given. The relationship of (ɱ,ɳ) strong full stability B-Algebra-module related to an ideal that states,  a B- -module Ӽ is (ɱ,ɳ)- strong full stability B-Algebra-module related to an ideal  , if and only if  for any two ɱ-element sub-sets and of Ӽɳ, if , for each j = 1, …, ɱ,  i = 1,…, ɳ  and   implies Ạɳ( ) Ạɳ(  have been proved.

Improving HiperLAN/2 Physical Layer Model Based Multiwavelet Signals by using Block Turbo Codes System

The progress of broadband wireless communication systems should cope with different performance restrictive challenges that include channel fading as well as size and power limitations at the mobile units.  In this paper, the Block Turbo Codes (BTC) is evaluated for the HiperLAN/2 OFDM system based multiwavelet signals. Matlab software-simulated physical layer performance results are presented show that Packet-Error- Rate (PER) performance is improved when using block turbo codes in the HiperLAN/2 system. We also show that the frequency interleaver has a big impact on the performance of the turbo decoding process and that increasing its size lead to good performance when compared to the convolutional code Keywords: HiperLAN/2, OFDM, DMWT, IDMWT, BTC, PER

A Cross Sectional Study of Knowledge and attitudes levels about Polio Vaccination among selected sample of Technical Institute \ AL-Suwaira staff members

Background: The previous laboratory investigations confirmed local polio case was informed on 28th  January 2000 and another two wild polio cases were reported from Resafa \ Baghdad province in 2014. The date of onset of these cases were February and April 2014 and both cases were connected to 2013 of Syria outbreak. Objective:To evaluate the knowledge and attitudes levels towards polio vaccination among staff of Technical Institute - AL-Suwaira. Patients and Methods: A study of cross-sectional design consisted of 170 a selected samples of Technical Institute \ AL-Suwaira staff members. Collected during January 2018.The knowledge and attitudes levels estimated by using typical design of self-administered questionnaire. Descriptive statistics were used to explain the results. Results: Over all, 170 participants reacted to the questionnaire by a response rate of 93.5%. All respondents established a good knowledge and positive attitudes levels to poliovirus vaccination. Mean knowledge score (built on11 knowledge questions) and mean attitude score (built on 10 attitudes statements) of participants about polio vaccine were 14.45±2.38 and 26.5±4.5 respectively. The mainstream of respondents agreed that all children should be taken the polio vaccine (88.2%), and the sterility concerns that associated with polio vaccines (14.1%). Television (n=126, 39%) and Internet (n = 66, 21%) were the main social media sources that used by staff members to educate and modify themselves about polio vaccination.  Knowledge defects were recognized in the management issues and how to dealing with vaccines (45.9%), the incubation period of poliovirus infection (38.8%) and the consequences of the poliovirus infection (56.5%) on the victims. Conclusion: Staff members of Technical Institute \ AL-Suwaira showed a good knowledge and positive attitudes levels about polio vaccination. Even though the statistics are indicative of knowledge gaps of participants, further studies are needed to assess these levels for better education program against polio

Optimization of Nano Hydroxyapatite/chitosan Electrophoretic Deposition on 316L Stainless Steel Using Taguchi Design of Experiments

The aim of this work is to determine the optimum parameters for deposition of chitosan and mixture of chitosan and hydroxyapatite (HA) layers using electrophoretic deposition.  The layers were on 316L stainless steel substrate. Taguchi approach was utilized to select the optimum parameters for both layers. The parameters used for deposition chitosan are voltage, time and temperature while the parameters used for HA and chitosan are voltage, time, concentration and temperature. Zeta potential tests were employed to measure the solutions stability.  Coating layers were characterized for thickness, porosity and nanoroughness using optical microscopy (OM) and atomic force microscopy (AFM).  The results from Taguchi design of experiments demonstrated that the best conditions for deposition of chitosan and HA layers are  50 V, 5 min, 3 g HA/L and 30°C.    The corresponding thickness, % porosity, nanoroughness and microroughness for optimum conditions were 22 µm, 3.53,  4.48 nm and 3.85 µm respectively

Laser Treatment of Plasma Spraying Alloyed Coatings

Ni23Cr6Al0.4Y plasma sprayed coating on nimonic75 substrate was remelted using a 1 kW continues CO2 laser. The topography, microstructure, phases and chemical analysis of plasma sprayed and laser melted regions were examined using various techniques including scanning electron microscope (SEM), electron probe microanalysis (EPMA), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The plasma sprayed coatings consisted heterogeneous microstructure of lamella with unmelted particles, voids, porosity and cracks. It was found that the depth of melting increased with increasing the specific energy. Homogenous and shiny melted regions were achieved without voids, porosity and cracks after laser melting. Thin upper surface layers with shallow cracks were observed due to the rich layer of α-Al2O3 and YAlO3. No phases changed were found before and after laser melting of plasma sprayed layers. The phases formed are mixtures of γ’, β, YAlO3 in the matrix γ. The microstructure formed after laser melting is fine cells. Keywords: Plasma sprayed coating; Laser melting, Ni solid solution; YAlO3; α-Al2O

Materials Selection in Conceptual Design using Weighting Property Method

The needs to combine selection of materials (SM) processes during the early stages of design have previously been realized. In this work, an attempt is made to ensure that there is no gap between function oriented design and the material. A methodology is being developed, for a concurrent qualitative selection of materials method (CQSM) that takes into consideration the importance of materials properties in the early design stages. The method is modified from quantitative method called weighting property method used for selecting materials in the detailed design stage. The method was modified to qualitative method; it means that the input data for materials property of the design must be qualitative data which consisting of groups or sub-groups of materials, range value properties and approximate values. By giving weight to the degree of importance of the properties, a developed database is search for the best group that can satisfy the CQSM. In the present investigation, a new numerical method has been build by using visual basic developed select materials for mechanical design in conceptual stage. This method, which is based on weighting property method (WPM) uses a new digital logic (DL) comparison with the traditional (DL) makes the result more accurate because it does not elimination problem of the least important criterion

Study the Corrosion Inhibition on the Iraqi Fuel Tanks using Cefoperazone Drug

Corrosion is one of the most important problems that face the petroleum industry, both production and refining, and cause damage to petroleum equipment, tanks, and transmission lines, and increasing maintenance costs. in this study ,  was  adding six concentrations of the drug expired Cefoperzone (Exp CEF) (50, 100, 200, 300, 400, and 500 ppm) to a Simulated Oil Well Water (SOWW), the inhibitive role of (Exp CEF)  drug was investigated to Reduce the corrosion risk of carbon steel. Four different temperatures were used to conduct electrochemical tests (303, 313, 323 and 333 K) to achieve the study. The study was then supported by an examination of the inhibited surface using field emission scanning electron microscopy with energy dispersive (FESEM) and (AFM). The results indicated occurring the inhibition by an anodic inhibitor that controls the dissolution of iron from steel gave the highest inhibition efficiency (IE%) by adding 500 ppm, while the calculation of polarization resistance (Rp) gave the highest resistance by 400 ppm through adsorption the added drug to show flakes shaped structures with decreasing surface roughness (Ra ) from 307.1 to 83.15  after inhibition. The calculation of adsorption isotherm confirmed the obeying of Langmuir adsorption isotherm by giving the coefficient of linear regression was about one in the range of 0.999 > R^2 > 0.995, with the spontaneous adsorption that estimated from the negative values of 〖∆H〗_ads^o and variation in the type of adsorption to be physically or chemically according to the added concentration because of the differential sign of 〖∆H〗_ads^o . The sign of 〖∆H〗_ads^o was positive that reflecting the increase in randomness at the metal/solution interface.

Laser cladding of ceramics and sealing of plasma sprayed zirconia based thermal barrier coatings

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