Print ISSN: 1813-162X

Online ISSN: 2312-7589

Volume 21, Issue 1

Volume 21, Issue 1, Autumn 2014, Page 1-100

An FPGA Implementation of Secured Steganography Communication System

Ahlam Fadhil Mahmood; Sana Sami Mohmmad; Nada Abdul Kanai

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 1-9

Steganography is the idea of hiding secret message in multimedia cover which will be transmitted through the Internet. The cover carriers can be image, video, sound or text data. This paper presents an implementation of color image steganographic system on Field Programmable Gate Array and the information hiding/extracting techniques in various images. The proposed algorithm is based on merge between the idea from the random pixel manipulation methods and the Least Significant Bit (LSB) matching of Steganography embedding and extracting method.
In a proposed steganography hardware approach, Linear Feedback Shift Register (LFSR) method has been used in stego architecture to hide the information in the image. The LFSRs are utilized in this approach as address generators. Different LFSR arrangements using different connection unit have been implemented at the hardware level for hiding/extracting the secret data. Multilayer embedding is implemented in parallel manner with a three-stage pipeline on FPGA.
This work showed attractive results especially in the high throughputs, better stego-image quality, requires little calculation and less utilization of FPGA area. The imperceptibility of the technique combined with high payload, robustness of embedded data and accurate data retrieval renders the proposed Steganography system is suitable for covert communication and secure data transmission applications.

Some Properties of Emulsified Asphalt Paving Mixture at Iraqi Environmental Conditions

Shakir.A.Al-Mishhadani; Hasan.H.Al-Baidhani; Hussein Hamel Zghair

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 10-18

Cold emulsified asphalt mixture is generally a mix made of emulsified asphalt with aggregate. Emulsified asphalt is manufactured from base asphalt, emulsifier agent and water with approximate percentage of 40% to 75% asphalt, 0.1% to 2.5% emulsifier and 25% to 60% water plus some minor components. This study aims to use the cold emulsified asphalt mixtures for road construction and maintenance in Iraq as an alternative to the hot asphalt mixtures, due to its economical, practical and environmental advantages. This studyfocused to test and evaluates the emulsified asphalt material properties to be used as paving mixture. The tested properties of emulsified asphalt mixture were bulk density, air voids, dry Marshall stability, wet Marshall stability, retained Marshall stability, flow tests and compared with the common used specification.The results indicate that the emulsified asphalt type cationic slow setting low viscosity (CSS-1) is very suitable with quartz type of aggregate from Al-Nibaay quarry. From many trial mixes it is found that the best percentages of initial residual bitumen content to produced adequateresults for coating test ,mixing ,compaction ,curing and Marshall stability were ranged from (2.5%, 3%,3.5%,4% and 4.5%), andthe optimum percentage is (3.5%).Finally it can be conducted that the emulsified asphalt mixture is a suitable alternative mixture to the hot asphalt mixture for road construction and maintenance in Iraq.

Mechanical Behavior of Polyester and Fiber Glass as a Composite Material used in a Vehicle under Dynamic Loading

Ali Yasser Hassan; Emad Abdul Hussein Abdul Sahib; Ahmed Naif Al-Khazraji

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 19-28

The automobile industry has shown increased interest in the replacement of steel spring with fiberglass composite leaf spring due to high strength compared to weight. The aim of this paper is to study two kinds of fiberglass, regular direction (0-90) and random direction immersed in polyester resin. They were tested under static load, as tensile test for their mechanical properties, and under dynamic load in fully reversible bending tests as fatigue test, to estimate S-N curves, and impact test for their mechanical properties. Results from the tensile tests showed that the tensile strength of the regular type is greater than random type. The fatigue test results showed that the number of cycles to failure in regular type of composite material is greater than that of the random type and the endurance limit is also greater than in random, the increase percentage in endurance limit is 7.5%. Results due to impact test showed that there were on increasing in fracture energy for the random type the increase ratio is 13.9%. The Important characteristics of composites that make them excellent for leaf spring instead of steel are higher strength-to-weight ratio, superior fatigue strength. Application of composite structures reduces the weight of leaf spring without any reduction on the load carrying capacity and stiffness in automobile suspension system.

Improvement Level of Service for Congested Intersection in CBD Area of Fallujah City

Hamid A. Awad; Thaer S. Mahmood

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 29-41

The concept of capacity and level of service are central to the analysis of intersections, as they are for all types of facilities. Both capacity and level of service must be fully considered to evaluate the overall operation of the intersections. The objectives of the present study include the analysis, evaluation level of service and traffic operation of Al- Abasse intersection in the CBD of Fallujah city. Al-Abbasi congested intersection which is located the CBD area of Fallujah are selected to achieve the objectives of the present study. The required traffic and geometrical data gathered manually to estimate the distribution of traffic in different directions. (HCS 2000) program are used for the requirements of traffic analysis process. It has concluded that the second proposal (construct flyover along New street toward Al – Kamaleat intersection) for the mentioned intersections is necessary to enhance the level of service and the traffic operation at Al – Abasse intersection in CBD of Fallujah city.

Effect of Hybrid Fibers on the Mechanical Properties of High Strength Concrete

Hamid H. Hussein; Hayder T. Abd; Saeed K. Rejeb

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 42-52

In this study, high strength concrete of 75 MPa compressive strength was investigated. The experimental program was designed to study the effect of fibers and hybrid fibers (steel and polypropylene fibers) on the fresh (workability and wet density) and hardened properties (compressive strength, splitting strength, flexural strength and dry density) of high strength concrete. Results show that decreases in slump flow of all concrete mixtures containing steel, polypropylene and hybrid fibers compared with control mix (0% fiber). Hybrid high strength concrete with steel and polypropylene fibers showed superior compressive, splitting, flexural strengths over the others concrete without or with single fibers content. The test results indicate that the maximum increase in compressive and flexural strengths are obtains with the hybridization ratio (70%steel + 30% polypropylene) and were equal to 14.54% and 23.34% respectively, compared with the control mix. While, the maximum increase in splitting tensile strength with (100% steel fiber + 0 polypropylene) is 21.19%.

Computer Aided Strut-and-Tie Model (CASTM) for the Analysis of RC Deep Beams

Nabeel A.-M. Al-Bayati; Ihsan A. S. Al-Shaarbaf; Nisreen S. Al-Nimer; Kaiss F. Sarsam

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 53-62

Many studies and a lot of research work have been done on the analysis and structural behavior of reinforced concrete deep beams [1, 2 and 3]. In these studies different calculation methods were used. The Beam Method has been used for many years; the Strut-and-Tie Method (STM) is recently included in the Eurocode [4] and has been included in the Canadian Standard for the Design of Concrete Structures[5] since 1984 and the AASHTO LRFD Bridge Specifications [6] since 1994, it is a new concept for many structural engineers in the U.S. but specific code requirements were not incorporated into the ACI 318 Building Code [7] until the 2002 edition, as Appendix A.. This paper aims mainly at finding the most economical way to analyze and design reinforced concrete deep beams. New computer program (CASTM), based on STM, aims to be "user friendly", presenting a complete packet not only as an analyzing tool but also as a design program.

Use of Recycling Building Demolition waste As Coarse Aggregate in Hot Mix Asphalt

Suham E. Saleh Al-Maliky; Nabil I. Al- Sarrag; Hanaa Khaleel A. Al-Baiti

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 63-76

At the recent years in Iraq, building demolition increase because of wars and the processes of destruction that lead to increase concrete waste, causing extreme pressure on the available land-filled sites that’s becomes a new challenge to local environment, in addition to south region from country poor from aggregate source.
So this study make as first evaluation to return use concrete aggregate for old and demolition building in concrete asphalt mix, the concrete aggregate obtained from building to live long more than 20 years after crash reinforcement concrete and sieving to get requirement granular particle to make locally asphalt mixture (Type IIIB) depends on modified specification of State Commission of Roads and Bridges (2003) with percent (0,25,50,75,100)% from weight of coarse aggregate.
Asphalt mixtures were tested by Marshall test, Indirect tensile strength test, and the loss of stability test.

Effect of Fibers and Filler Types on Fresh and Hardened Properties of Self-Compacting Concrete

Majid Kh . N; Ayad A. M; Saeed K. Rejeb

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 77-83

This paper deals with studying the fresh and hardened properties of self-compacting concrete, by using three types of filler (silica fume, clinker powder & lime stone powder), and two types of fibers (steel & glass fibers) with volume fractions of (0.5%) and (0.1%) respectively. For each type of fillers, the fresh properties are measured by using Slump test, J- ring and V- funnel, while hardened properties include the compressive strength, splitting tensile strength and flexural strength. The results show that adding fibers to the self-compacting concrete (SCC) well reduces the workability and improves the hardened properties. Also, the study concluded that better workability is obtained by using (lime stone, silica fume and clinker powder) as fillers, respectively. While the higher hardened properties are gained by using silica fume were rather than those of other types of fillers

Image Deblurring and Effect of Wiener, Regularized, Lucky-Richardson, Blind-Deconvolution, Average and Median Filters on Blurred Image and Noisy Image

Shayma Wail Nourildean; Mohammed Ismaeel Khalil

Tikrit Journal of Engineering Sciences, Volume 21, Issue 1, Pages 84-95

In image deblurring, we try to recover the original, sharp image by using a mathematical model of the blurring process. There are several techniques to recover the original image, but they could not recover the image exactly. In this paper, four algorithms (Weiner filter, regularized filter, lucky- Richardson and blind deconvolution), average and median filters were applied on the blurred image to recover the original image. Then noise was added to the original image and the same six algorithms were applied to noisy image. This study was done using MATLAB program, the result shows that the four algorithms (Weiner filter, regularized filter, lucky- Richardson and blind deconvolution) were used for deblurring image with information about distortion operator but median and average filters were failed in deblurring image while they were successful in restoring the noisy image. Wiener and regularized filters were failed to restore the original image from noisy image.