Koyuncu, Murat

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Name Variants
M.,Koyuncu
Koyuncu M.
Koyuncu, Murat
M., Koyuncu
K.,Murat
Koyuncu, M
Koyuncu,M.
K., Murat
Murat, Koyuncu
Job Title
Profesor Doktor
Email Address
murat.koyuncu@atilim.edu.tr
ORCID ID
0000-0003-1958-5945
Scopus Author ID
7004305370
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Scholarly Output

92

Articles

29

Citation Count

332

Supervised Theses

23

Scholarly Output Search Results

Now showing 1 - 10 of 92
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    Conference Object
    Citation Count: 0
    Fuzzy Semantic Web Architecture for Activity Detection in Wireless Multimedia Sensor Network Applications
    (Atlantis Press, 2019) Ozdin, Ali Nail; Yazici, Adnan; Koyuncu, Murat; Information Systems Engineering
    This study aims to increase the reliability of activity detection in Wireless Multimedia Sensor Networks (WMSNs) by using Semantic Web technologies extended with fuzzy logic. The proposed approach consists of three layers: the sensor layer, the data layer, and the Semantic Web layer. The sensor layer comprises a WMSN comprising sensor nodes with multimedia and scalar sensors. The data layer retrieves and stores data from the sink of WMSN. At the top of the architecture, there is a semantic web layer that includes a semantic web application server, a fuzzy reasoning engine, and a semantic knowledge base. When a new entity is detected at the sensor layer, the associated data produced by the sensors and the sink are collected in the data layer and transmitted to the semantic web application server where the data is converted into subjects, predicates, and objects, according to the ontology conceived and recorded in RDF format. Then, the fuzzy reasoning engine is automatically activated and fuzzy rules are executed to determine if there is an activity in the monitored area. Our implementation confirms that extended semantic Web technologies with fuzzy logic can have a significant impact on the detection of activities in WMSNs.
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    Conference Object
    Citation Count: 11
    A Suite of Cognitive Complexity Metrics
    (Springer-verlag Berlin, 2012) Misra, Sanjay; Koyuncu, Murat; Crasso, Marco; Mateos, Cristian; Zunino, Alejandro; Computer Engineering; Information Systems Engineering
    In this paper, we propose a suite of cognitive metrics for evaluating complexity of object-oriented (OO) codes. The proposed metric suite evaluates several important features of OO languages. Specifically, the proposed metrics are to measure method complexity, message complexity (coupling), attributes complexity and class complexity. We propose also a code complexity by considering the complexity due to inheritance for the whole system. All these proposed metrics (except attribute complexity) use the cognitive aspect of the code in terms of cognitive weight. All the metrics have critically examined through theoretical and empirical validation processes.
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    Conference Object
    Citation Count: 0
    Feature Fusion in Part-Based Object Detection
    (Ieee, 2015) Koyuncu, Murat; Cetinkaya, Basar; Information Systems Engineering
    In this study, classification of complex objects in images as a whole is compared with classification of its distinctive components using different features. In addition, the impact of feature fusion in part-based object detection is investigated. Applied method, implemented system, conducted tests and their results are presented in this paper. Test results show that, even in the case of a good segmentation, object components are classified more successfully compared to whole object and feature fusion method improves the obtained results to a certain degree.
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    Article
    Citation Count: 11
    Does Domain-Driven Design Lead to Finding the Optimal Modularity of a Microservice?
    (Ieee-inst Electrical Electronics Engineers inc, 2021) Vural, Hulya; Koyuncu, Murat; Information Systems Engineering
    Information systems are moving into the cloud. The new requirements enforced by cloud standards are high availability, high scalability, and a reduced mean time to recovery. Due to these new requirements, information system architecture styles are also evolving. Microservice architecture is becoming the de facto standard for developing highly modular cloud information systems. Since microservices were introduced, there has been an ongoing debate concerning how to choose the granularity of a microservice. In this study, the optimal point of granularity for microservices is examined based on coupling and cohesion values. The present study is based on two design examples generated in previous studies that applied domain-driven design in proposing microservices. Both examples are modified to generate more and less granular microservices. The coupling and cohesion values of the original examples are compared to those of the more and less granular microservices. We observe that domain-driven design has delivered a good end result for finding modular microservices.
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    Conference Object
    Citation Count: 0
    Fuzzy semantic web architecture for activity detection in wireless multimedia sensor network applications
    (Atlantis Press, 2020) Ozdin,A.N.; Yazici,A.; Koyuncu,M.; Information Systems Engineering; Software Engineering
    This study aims to increase the reliability of activity detection in Wireless Multimedia Sensor Networks (WMSNs) by using Semantic Web technologies extended with fuzzy logic. The proposed approach consists of three layers: the sensor layer, the data layer, and the Semantic Web layer. The sensor layer comprises a WMSN comprising sensor nodes with multimedia and scalar sensors. The data layer retrieves and stores data from the sink of WMSN. At the top of the architecture, there is a semantic web layer that includes a semantic web application server, a fuzzy reasoning engine, and a semantic knowledge base. When a new entity is detected at the sensor layer, the associated data produced by the sensors and the sink are collected in the data layer and transmitted to the semantic web application server where the data is converted into subjects, predicates, and objects, according to the ontology conceived and recorded in RDF format. Then, the fuzzy reasoning engine is automatically activated and fuzzy rules are executed to determine if there is an activity in the monitored area. Our implementation confirms that extended semantic Web technologies with fuzzy logic can have a significant impact on the detection of activities in WMSNs. Copyright © 2019, the Authors. Published by Atlantis Press. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).
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    Article
    Citation Count: 0
    FNBDT/SCIP protokolünün yerel alan ağında uygulanması ve sınır değerlerin tespit edilmesi
    (2010) Dilli, Orkun; Akçam, Nursel; Koyuncu, Murat; Information Systems Engineering
    Teknolojideki hızlı değişim her alanda olduğu gibi haberleşme sistemlerinde de yaşanmaktadır. Geliştirilen farklı sistemler veya cihazlar zaman kaybedilmeden kullanıma sunulmaktadır. Söz konusu değişim genelde olumlu olmakla birlikte bazen olumsuz sonuçlara da yol açabilmektedir. Bu olumsuz sonuçlardan bir tanesi, ISDN, PSTN ve IP tabanlı haberleşme cihazlarının birbirleriyle uçtan uca güvenli olarak haberleşme yapamamasıdır. Bu çalışmada, farklı haberleşme ağları üzerinde uçtan uca emniyetli haberleşmenin yapılması amacıyla geliştirilen FNBDT (Future Narrow Band Digital Terminal)/SCIP (Secure Communication Interoperability Protocol) protokolü, emulatörler vasıtasıyla IP ağ üzerinde değişik açılardan test edilmiştir. Bu tür çalışmaların yapılmasının FNBDT/SCIP protokolünün gelişimine katkıda bulunmak açısından büyük önem arz etmekte olduğu ve sunulan çalışmanın bu alanda gerçekleştirilmiş ilk çalışmalardan birisi olması nedeniyle de gelecekte konuyla ilgili yapılacak çalışmalara katkı sağlayacağı düşünülmektedir.
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    Conference Object
    Citation Count: 9
    A Case Study on Measuring the Size of Microservices
    (Springer international Publishing Ag, 2018) Vural, Hulya; Koyuncu, Murat; Misra, Sanjay; Information Systems Engineering; Computer Engineering
    In cloud computing, the microservices has become the mostly used architectural style. However, there is still an ongoing debate about how big a microservice should be. In this case study, a monolith application is measured using Common Software Measurement International Consortium (COSMIC) Function Points. The same application is divided into pieces by following the Domain Driven Design (DDD) principles. The resulting cloud friendly microservices are measured again using COSMIC Function Points and the obtained results are compared.
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    Conference Object
    Citation Count: 0
    Part-Based Object Extraction for Complex Objects
    (Ieee, 2014) Koyuncu, Murat; Cetinkaya, Basar; Information Systems Engineering
    Indexing requirement for efficient accessing to visual data has been increased with the widespread use of multimedia applications. Satisfaction of this requirement mostly depends on the automatic extraction of objects in the visual data. In this study, component-based object extraction method is compared with object extraction in its entirety. Applied method, implemented system and conducted tests are presented in this paper. Test results show that, even in the case of a good segmentation is achieved for whole object, object components are classified more successfully compared to whole object.
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    Article
    Citation Count: 4
    Systematic investigation of the effects of unidirectional links on the lifetime of wireless sensor networks
    (Elsevier, 2013) Ozyer, Sibel T.; Tavli, Bulent; Dursun, Kayhan; Koyuncu, Murat; Information Systems Engineering
    Link unidirectionality is a commonly encountered phenomenon in wireless sensor networks (WSNs), which is a natural result of various properties of wireless transceivers as well as the environment. Transmission power heterogeneity and random irregularities are important factors that create unidirectional links. Majority of the internode data transfer mechanisms are designed to work on bidirectional links (i.e., due to the lack of a direct reverse path, handshaking cannot be performed between a transmitter and receiver) which render the use of unidirectional links infeasible. Yet, there are some data transfer mechanisms designed specifically to operate on unidirectional links which employ distributed handshaking mechanisms (i.e., instead of using a direct reverse path, a multi-hop reverse path is used for the handshake). In this study, we investigate the impact of both transmission power heterogeneity and random irregularities on the lifetime of WSNs through a novel linear programming (LP) framework both for networks that utilize only bidirectional links and for those that can use bidirectional links as well as unidirectional links. (C) 2013 Elsevier B.V. All rights reserved.
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    Article
    Citation Count: 19
    An inheritance complexity metric for object-oriented code: A cognitive approach
    (Springer india, 2011) Misra, Sanjay; Akman, Ibrahim; Koyuncu, Murat; Information Systems Engineering; Computer Engineering
    Software metrics should be used in order to improve the productivity and quality of software, because they provide critical information about reliability and maintainability of the system. In this paper, we propose a cognitive complexity metric for evaluating design of object-oriented (OO) code. The proposed metric is based on an important feature of the OO systems: Inheritance. It calculates the complexity at method level considering internal structure of methods, and also considers inheritance to calculate the complexity of class hierarchies. The proposed metric is validated both theoretically and empirically. For theoretical validation, principles of measurement theory are applied since the measurement theory has been proposed and extensively used in the literature as a means to evaluate the software engineering metrics. We applied our metric on a real project for empirical validation and compared it with Chidamber and Kemerer (CK) metrics suite. The theoretical, practical and empirical validations and the comparative study prove the robustness of the measure.