Cihan University-Erbil Scientific Journal 2019-07-15T07:30:11+00:00 Cihan University-Erbil Journal Open Journal Systems <p>Cihan University-Erbil Scientific journal (CUESJ) is a biannual academic journal published by the Cihan University-Erbil. CUESJ a periodical journal publishes original researches in all areas of Science, Engineering and Technology. CUESJ is a Peer-Reviewed Open Access journal with Creative Commons Attribution Non-Commercial No Derivatives License 4.0 (CC BY-NC-ND 4.0). CUESJ provides immediate, worldwide, barrier-free access to the full text of research articles without requiring a subscription to the journal, and has no article processing charge (APC). CUESJ applies the highest standards to everything it does and adopts IEEE citation/referencing style. CUESJ Section Policy includes three types of publications; Articles, Review Articles, and Letters. CUESJ is a member of the ROAD with print-ISSN: 2519-6979 and a member of the Crossref a doi: 10.24086/issn.2519-6979</p> Design and Simulation of Worldwide Interoperability for Microwave Access Computer Network for 3×3 Km Universal Sample of Building Campus 2019-07-15T07:30:11+00:00 Ammar O. Hasan Firas Muhammad Zeki Mahmood <p>The aim of this study to design a wireless computer network of a particular network as a large-scale company or university to improve&nbsp;mobility and to let the teachers and students of the university, for example, stay interacted and connected at any time in any campus&nbsp;location or site. Therefore, This study needed to cover the overall area of this campus with efficient wireless coverage that exceeds the&nbsp;university boundaries to maintain wireless signal strength. To do that, the researchers thought that it is very significant to design a&nbsp;Worldwide Interoperability for Microwave Access (WiMax) computer network with the most powerful and advanced hardware component&nbsp;capabilities to full fit teachers’ and students’ requirements of fast net browsing and files’ download. After designing the university campus&nbsp;of computer network, simulation has done by OPNET 14 Modular to determine the WiMax network design parameters. The purpose&nbsp;of the current research is to find if the design of the campus network is efficient or not and also to determine the performance of the<br>implemented network.</p> 2019-05-13T00:00:00+00:00 ##submission.copyrightStatement## Improving the Level of Service of a Portion of 60-M Ring-Road in Erbil City 2019-07-15T07:30:10+00:00 Dlzar B. Qadr Shorsh A. Mohammed Ibrahim A. Hasan Rawand F. Mohammed Ali <p>This study aims to implement the factors that can improve the level of service of 60-M Ring-Road in Erbil, Kurdistan Region of Iraq. These factors are minimizing the traffic volume, providing a higher quality pavement, widening the road carriageway, and constructing bridges. The main objective of this paper is to increase the LOS of a specific road known as 60-m ring road from New City Mall to PAR hospital in Erbil city. For this purpose, the data on speed and traffic flow are collected using video camera to collect data to be reasonably analyzed with respect to the speed of the vehicles and set the LOS for the proposed road. The result shows that average speed in this study is 19 km/h, and this confirms that the LOS in this particular road segment is at F category. In addition, the calculated peak hour factor is 0.97 which is more than a typical value in urban area. Finally, the study revealed that the traffic volume on this specified road is too high.</p> 2019-05-13T00:00:00+00:00 ##submission.copyrightStatement## Evaluation of Construction Delay of Public Projects in Erbil Governorate 2019-07-15T07:30:10+00:00 Noori Sadeq Ali Khalil Ismail Wali <p>Delay is one of the greatest challenges facing the implementation of construction projects. The completion project time is considered one of the measure indicators for assessing the success of any project. Delays usually have negative impacts of financial and social to all parties involved in the projects. The aim of the study is to find the most important causes of delay by evaluating the common causes of delays in terms of frequency, severity, and important indices in implementation of public construction projects in Erbil Governorate related to owners, contractors, consultants, and external factors. The data gathered through conducting a questionnaire for perception various parties involved in implementation of public construction projects. For these purpose, 104 forms of questionnaire were distributed to various parts to identify the delay causes in accordance with their opinions. It was concluded that the most significant factors causing the delay in construction of public project in Erbil Governorate related to the owner were “variation orders by owner during the construction” which came in the first rank, while the cause of delay related to the consultant that came in the first rank was “unclear and inadequate details in drawings,” whereas the factor related to the contractor which came in the first rank was “selecting incompetent contractor.”</p> 2019-05-13T00:00:00+00:00 ##submission.copyrightStatement## Cooperating Newton’s Method with Series Solution Method for Solving System of Linear Mixed Volterra-Fredholm Integral Equation of the Second Kind 2019-07-15T07:30:09+00:00 Talaat I. Hasan <p>In this paper, for the 1st time, we use Newton’s method with series solution method (SSM) for solving system of linear mixed Volterra-Fredholm integral equations of the second kind (SLMVFIE-2). In this work, we use a new technique for studying the numerical solutions for SLMVFIE-2 which is Newton’s method with SSM, first solving this system using SSM and after that cooperation Newton’s method with SSM, suggesting an algorithm for the technique. The new results are achieved and some new theorems have proved for convergence of the method, several numerical examples are tested for illustrating the usefulness of the technique; the numerical results are obtained and compared with the exact solution, computing the least square error, and running times which are criterion of discussion. For programming the technique, we use general Matlab program.</p> 2019-05-13T00:00:00+00:00 ##submission.copyrightStatement## Sediment Yield Problems in Khassa Chai Watershed Using Hydrologic Models 2019-07-15T07:30:08+00:00 Mahmoud I. Mahmoud Mustafa N. Kasim <p>Upland erosion and sedimentation are one of the severe problems which faces dams as sediments occupy spaces within reservoirs storage, hence, decreasing live water storage which is the main purpose of dam’s construction. Iraq is one of the countries that will face a significant shortage of water income as a result of both the increment in water demand and of the reduction of water shares from the source countries. Thus, the existing dams in Iraq represent a strategic resource to fulfill water demands, and the sedimentation at these dams is studied to assess the quantity of sediments that reach to these reservoirs and decrease available water volume and useful life of reservoir. In the current study, Khassa Chai Dam is located in the Northeast of Iraq and its main watershed basin covers an area of about 412 km2 between Kirkuk and Al Sulaymaniyah Governorates has been selected to estimate and predict the amount of sediment yield based on 30 years of daily climate data and the events of different intensity rainstorms. Automated geospatial watershed assessment (AGWA) tool model has been used to simulate Khassa Chai Dam catchment area. This model utilizes the geographic information system (GIS) application to analyze the required data from GIS layer for digital elevation model, soil type, land use, and land cover by interference with the required climate data. The key components of AGWA model are the soil and water assessment tool model and kinematic runoff and erosion (KINEROS) model which are able to simulate complex watershed behavior to explicitly account for spatial variability of soils, rainfall distribution patterns, and vegetation. The hydrologic characteristics for Khassa Chai catchment area according to the SWAT outputs show that the most erosive sub-basins are not able to deliver the eroded material or sediments to the reservoir due to their transmission losses, percolation, and other minor obstacles. KINEROS model simulation for sediment yield is much closer to the behavior of Khassa Chai watershed in erosion and sediment transport according to the single storm events and for individually selected sub-watersheds which are closed in their location to reservoir inlet.</p> 2019-05-13T00:00:00+00:00 ##submission.copyrightStatement## Prediction the Groundwater Depth using Kriging Method and Bayesian Kalman Filter Approach in Erbil Governorate 2019-07-08T12:30:02+00:00 Kurdistan Ibrahim Mawlood Paree Khan Aabdulla Omer <p>The aim of this research is using the kriging method as one of geostatistics interpolation methods on the measured value of the specific part&nbsp;and Bayesian Kalman filter to identifying the depth of Groundwater in Erbil. Geostatistics is a tool which is developed for statistical analysis&nbsp;of any continuous data that can be measured at any location in the space. The Kalman filter is the Bayesian optimum solution to the problem&nbsp;of estimating the unknown state of a dynamic system from noisy data and is more efficient than computing the estimate directly from the&nbsp;entire past observed data. The main goal of this work is to predict anew value at the unmeasured location by kriging method and Bayesian&nbsp;Kalman filter and compare these two methods. The dataset is the observed values of the (295) wells that had been taken from a known&nbsp;specific place which called Shaqlawa – in Erbil Governorate. The comparison was done by calculating mean absolute error (MAE) and root&nbsp;mean square error (RMSE) for the value of the depth of groundwater in the eara of the study. The values of (MAE and RMSE) of each models&nbsp;are compared and the smaller values of them are the better interpolation as it shown in analyzing to evaluate the precision of the prediction.</p> 2019-06-30T00:00:00+00:00 ##submission.copyrightStatement##