IJET Vol. 7, Issue 2, June 2021
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Öğe Identification with Face Recognition Methods in Real Life Applications(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2021) Ediz, ÇağlaThe development of technologies such as employment tracking systems, personal security, and the use of robots has led a lot of studies on face recognition systems. In the most of studies considering face recognition, recognition accuracies are very high, since training and testing images are selected randomly from the same databases. However, in real life applications, these images are not randomly selected from the same database. Because, these systems are trained during installation of the recognition system or when a new person needs to be introduced to the system. On the other hand, images used for predictions are uploaded to the system at other times. In this study, it is aimed to show that the accuracy rates of real-life face recognition systems differ from the systems trained and tested with randomly selected images as usually done in literature. To observe this difference in the first step, training and test images are selected randomly. In the second step, training and test images are divided according to the recording dates as in real life. Accuracy rates are evaluated by using linear discriminant analysis, local binary patterns and principal component analysis methods. Although the accuracies are very high for the first step, it is seen that the accuracies fell dramatically in the second step for all methods. Afterwards a new method is searched also in this study to increase these low accuracy rates. It is shown that usage of eye area images instead of face images has higher accuracy rates in all above methods for real life applications.Öğe COVID-19 Quarantine Monitoring Based on Geofencing Technique(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Yayınları, 2021) Alqrnawi, Nawar; Myderrizi, Indrit?Smartphone and satellite network coverage contributes to a number of useful applications that increase the comfort of everyday people's lives. Using the Global Positioning System (GPS) provided by the satellite, people can be tracked in real time at a specific location. When it comes to infectious diseases such as COVID-19, the most important measure to reduce its spread is to contain it. Quarantine is usually a solution and any tracking system can be employed to specify the location of the infected people. However, as quarantined areas are scattered around the world, it is difficult to accurately trace the boundaries within accommodation. A geo-fenced GPS system, which has adopted an efficient border protection system, is proposed for quarantine and monitoring purposes of COVID-19 carriers. The system is introduced as an application to implement a home/local quarantine policy using bracelets that fit the boundaries of smartphones. From the experimental results obtained, it is observed that the proposed system achieves an effective and high accuracy performance in various location conditions.Öğe Effect of Slag Fineness and Curing Conditions on the Mechanical Properties of Alkali-Activated Blast Furnace Slag Mortars(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Yayınları, 2021) Biricik, Hasan; Sanrı Karapınar, IşılThe main objective of this experimental study was to investigate the effect of the slag fineness on the compressive and flexural strengths of ground granulated alkali-activated blast furnace slag mortars. Two types of alkali-activated mortar mixtures were produced using blast furnace slags having the Blaine fineness of 400 m2/kg and 600 m2/kg. Three curing methods; water curing, air curing and outdoor conditions, were applied to the samples. Compressive strengths and flexural strengths of the mixtures were determined at various ages and capillary water absorption tests were also performed. Test results confirm that increasing the fineness of slag had an important effect on the properties obtained. The curing method is also an important factor affecting the results.Öğe Design of a System Dynamics Model (SDM) to Evaluate the Supply Chain of Biological Products(İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Yayınları, 2021) Seraji, Salameh; Mehrmanesh, Hasan; Kasraee, Ahmad R.Today, organizational agility in a competitive business environment has become the primary principle of success. In the supply-chain management of any organization, its suppliers play an important role in achieving this significant goal. Therefore, the importance of evaluation in selecting and cooperating with suppliers plays a noteworthy role in increasing the chances of success. Meanwhile, identifying the supplier's evaluation indicators in a dynamic and uncertain environment has become a major challenge for managers. This article tries to provide an accurate and reliable solution to this important challenge based on the design of a System Dynamics Model (SDM). Thereby, the main purpose of this paper is to provide a model for evaluating suppliers in the biological supply chain. Then, the reliability and accuracy of the proposed model, are evaluated with several statistical tests. Finally, the performance of this model is shown in the supply chain of a vaccine and serum Institute. The results obtained, both in the tests and in the case study, all indicate the model's ability, reliability, and high accuracy in evaluating suppliers.
