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Permanent URI for this collectionhttps://ada.atilim.edu.tr/handle/123456789/18

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Citation Count: 2
Achieving success in supply chain management software by agility
(Springer-verlag Berlin, 2007) Mishra, Deepti; Mishra, Alok; Computer Engineering; Software Engineering
Supply chain management is comprehensive software. Due to its scope and unpredictable, complex and unstable requirements, it is not possible to develop it with predictable development process models. Agile methodologies are targeted towards such kind of problems that involves change and uncertainty, and are adaptive rather than predictive. The aim of this paper is to analyze the management and development methodologies used in development of supply chain management software. This paper shows how to overcome risks and handicaps in each development phase of a complex inventive project. It also provides a set of guidelines regarding how the agile methods may be adopted, combined and used in these kinds of projects.
Citation Count: 1
Adapting test-driven development for innovative software development project
(Springer-verlag Berlin, 2007) Mishra, Deepti; Mishra, Alok; Computer Engineering; Software Engineering
In Test-Driven development, first test is made according to the customer requirement and then code is prepared to execute this test successfully. In this approach, design is not done exclusively before preparing test cases and coding. Design emerges as software evolves but this may result in lack of design quality. We adapted TDD by incorporating exclusive architectural design phase in the successful implementation of an innovative, large scale, complex project.
Citation Count: 4
An Agent-based Trading Infrastructure for Combinatorial Reverse Auctions
(Ieee, 2014) Bayindir, Hakan; Kilic, Hurevren; Rehan, Mohammed; Computer Engineering
A Combinatorial Reverse Auction Trading Infrastructure - CRATI is designed and implemented as an agent-based system. Two basic building blocks Java Agent Development Framework (JADE) and an Open Source Java Constraint Programming Library (Choco Solver) are used to facilitate agent interactions and an optimization task. For our purpose, it is shown that auction Winner Determination Problem (WDP) can suitably be represented as a weighted set covering problem instance whose solution gives the decided winners of the auction process. In order to realize the system, a variation of Contract Net protocol is designed and implemented to handle auctions that occur in the platform from start to finish.
Citation Count: 0
AN ALGORITHM FOR PASSIVE RFID BASED LOCATION ESTIMATION
(Ieee, 2014) Ozyurt, Erdem; Aydin, Elif; Yapici, A. Cagri; Department of Electrical & Electronics Engineering
In this study, an indoor localization system is developed for the mobile robots. The localization system consists of a passive RFID tag and a reader. The passive RFID tag is placed on the robot and reader antennas are spatially dispersed into the room. For the localization, Selective Adaptive Weighted Centroid Localization (SAWCL) algorithm is used. Performance of the localization system is evaluated for the different tags.
Citation Count: 1
Analysis of Measurement Instrumentation Delay in Modular Experimental Radar at C Band
(Ieee, 2018) Abdulrazigh, Mahfoud Y. A.; Uzundurukan, Emre; Kara, Ali; Department of Electrical & Electronics Engineering; Airframe and Powerplant Maintenance
Unlike pulsed radars, Frequency-Modulated Continuous Wave (FMCW) radar emits continuously very low power levels with the same signal to noise ratio (SNR) of an equivalent pulsed radar. FMCW can measure range and speed of the target. In modular design of such radar, time delay is experienced due to modular components such as low-noise amplifiers (LNA), antennas and, especially, cables. This time delay causes frequency shifts in the measured beat frequency resulting a range measurement error. Therefore, this time delay has to be studied for accuracy of measurements. In this study, experimental results of range measurement errors of a FMCW radar operating at C band are presented. Considering time delay of modular components, a range error of approximately 0.1m was obtained within a range of 10m.
Citation Count: 1
Analyzing the Requirements for E-government Transition of Iraqi ICS Services
(Ieee, 2017) Alameri, Mohammed Abdulbasit; Bostan, Atila; Akman, Ibrahim; Computer Engineering
Iraqi Correction Services (ICS) is a department within the Ministry of Justice. Most services are provided through traditional paper and pen system. This system causes delays in service provision lime and work over-load on ICS staff which translates into a high cost of service provision. E-government applications represent an opportunity to automate governmental services while improving both effectiveness and efficiency. This work presents the approach taken to determine the priority to automate ICS service from the perspective of service beneficiaries. The research is yet to be completed, however, up to this point we developed four different questionnaire-sets in order to collect the requirements from the shareholders, verified them and implemented the actual survey in the field. The experience gained throughout these steps and the future analysis plan is reported in this paper.
Citation Count: 2
An Application of High-Power Electromagnetic Pulse: Forming of sheet metal using electromagnetic waves
(Ieee, 2015) Inanan, Gokhan; Baranoglu, Besim; Aydin, Elif; Department of Electrical & Electronics Engineering; Manufacturing Engineering
In this study, the application of high velocity metal forming process by means of electromagnetic field is proposed. Electromagnetic Sheet Metal Forming (ESMF) is a process of forming sheet metal with very high speed (in milliseconds) without mechanical contact using the energy density of a pulsed magnetic field. In this process, deformation of the workpiece is driven by a transient electric current that is induced in a coil using a capacitor bank and discharge switch. This study presents some experiments and their results by examining the effects of different parameters in the proposed ESMF setup. The analysis and modelling of Electromagnetic sheet metal forming (ESMF) process is presented, as well. It has been seen that, it is possible to design a new system using the outcomes of this study.
Citation Count: 0
An approach for Improving Performance of Sensorless Field Control
(Ieee, 2018) Ertan, H. Bulent; Filci, Tayfun; Electrical-Electronics Engineering
Sensorless vector control is preferred in some applications, because there is no need for speed or position sensor. However, by their very nature, they are susceptible to making position error in rotor position estimation. As a consequence the performance of motor drives employing this technology is lower than those which employ sensors. This paper presents a new approach which identifies and uses rotor slot harmonic current component in the stator current to identify rotor position. The time taken by the algorithm used is short enough to be embedded within the vector control algorithm. The essence of the algorithm is treating the current component due to rotor slot harmonics as an amplitude modulated signal on the fundamental current component. The magnitude of this current component is identified via demodulation. Using this information rotor position and speed can be determined. This approach is tested on a commercial induction motor and some results are presented which illustrate that rotor position can be successfully determined.
Citation Count: 0
An Approach for Perceptual Similarity Detection between Audios Independent of Genre via Metadata Extraction and Correlation
(Ieee, 2007) Komsu, Fatma; Oeztoprak, Kasim; Tora, Hakan; Airframe and Powerplant Maintenance
This study presents an approach for perceptual similarity detection between audios independent of genre. The study is formed of three phases; signal pre-processing as the first phase, metadata extraction via various perceptually compatible features as the second phase, and correlation methodology for similarity identification as the third phase. The performance and relative importance of the selected features for perceptual similarity analysis are presented, as testing results. Moreover, relative importance of preprocessing is introduced. Using the proposed methodology, perceptual similarity detection between genre independent audios is achieved with a 96.85% performance. Contribution highly lies on the independency of genre.
Citation Count: 0
ATA50 TELESCOPE: HARDWARE
(Universidad Nacional Autonoma Mexico instituto Astronomia, 2014) Yesilyaprak, C.; Yerli, S. K.; Aksaker, N.; Yildiran, Y.; Guney, Y.; Gucsav, B. B.; Yasar, E.
ATA50 Telescope is a new telescope with RC optics and 50 cm diameter. It was supported by Atatiirk University Scientific Research Project (2010) and established at about 2000 meters altitude in city of Erzurum in Turkey last year. The observations were started a few months ago under the direction and control of Atatiirk University Astrophysics Research and Application Center (ATASAM). The technical properties and infrastructures of ATA50 Telescope are presented and we have been working on the robotic automation of the telescope as hardware and software in order to be a ready-on-demand candidate for both national and international telescope networks.
The Audition of Final Accounts Law: a Critical Approach on The Inefficiency of Existing Audition and Solution Offers in Order To Promote Efficiency
(Istanbul Univ Press, Istanbul Univ Rectorate, 2019) Muftuoglu, Zeynep; Law
The detection of flaws in the audit of the final accounts law, which is an indicator of the compatibility of the revenues collected and spending in a given financial year made by the executive body to the budget law, and efforts to address these flaws is a major requirement for fulfilling the principle of the rule of law and ensuring the budget right. In the study, regarding the importance of final accounts law in the realization of rule of law principle and budget right, the characteristics of the final accounts law and the auditing mechanisms on it are being examined. Such examination is held through a critical approach and ineffective and problematic sides of the auditing are tried to be sorted out. In the light of that research, solutions are tried to be developed. Regarding that aim, in the conclusion section, the mechanisms required to address the flaws caused by the shortcomings of the conducted audits will be discussed and suggestions that would remove these shortcomings will tired to be suggested. As it can be seen in the discussions, the most possible and effective way to remove the flaws in the auditing of the final accounts law can be appointed and zoomed on the legislative branch. On the basis of the characteristics of the auditions, solutions will be more focused on legislative level as well.
Citation Count: 0
A Bayes decision model for RSS based location estimation
(Ieee, 2007) Dincer, Zeynep; Oektem, Rwen; Aydin, Elif; Department of Electrical & Electronics Engineering
This work introduces a location estimation method based on Bayes Decision Theory using Radio Signal Strengths for indoor environment. Signal Strengths are observed through three transmitters at three distinct frequencies in UHF band, an active RFID tag and a modem connected to a computer. The test environment is 2100cmx720cm, which is divided into classed of square grids. For each class, a set of received signal strengths are measured and processed. Assuming that the class in which the RFID tag was located in the previous time of measurement is known, the next location (class) is estimated using Bayes Decision Theory. Proposed method is tested in a laboratory environment with obstacles. Results show that proposed method will be successful in location estimation where the estimation error stays within around 2m.
Citation Count: 53
Best Proximity Point on Different Type Contractions
(Natural Sciences Publishing Corp-nsp, 2011) Karapinar, Erdal; Erhan, Inci M.; Mathematics
In this manuscript, some proximity points are obtained by using different types cyclic contractions. Also, generalized cyclic Meir Keeler contraction is introduced and a new fixed point theorem for this cyclic mapping is stated.
Citation Count: 1
Bicriteria Scheduling Problem on the Two-Machine Flowshop Using Simulated Annealing
(Springer-verlag Berlin, 2010) Mesgarpour, Mohammad; Kirkavak, Nureddin; Ozaktas, Hakan
Real life scheduling problems require the decision maker to consider a number of criteria before arriving at any decision. The trade-offs involved in considering several different criteria provide useful insights for the decision maker. Surprisingly, research in the field of multi-objective scheduling has been quite limited when compared to research in single criterion scheduling. The subject of this paper is the bicriteria scheduling problem in a two-machine flowshop. The objective is to find a job sequence that minimizes sum of weighted total flowtime and total tardiness. Based on the problem characteristics, a Simulated Annealing algorithm is developed. The proposed meta-heuristic is compared with the branch and bound enumeration algorithm of the integer programming model as well as a modified version of the well-known NEH algorithm. During these evaluations, the experimental design approach and careful statistical analysis have been used to validate the effectiveness of the simulated annealing approach.
Citation Count: 0
Bilimsellik Değerlerinin İçeriği ve Yapısı*
(Istanbul Univ, Fac Letters, dept Psychology, 2021) Demirutku, Kürşad; Güngör, Elis; Department of Psychology
Bu araştırmanın amacı bilimsel bağlamla ilişkili değerlerin tespit edilmesi ve bu değerlerin Schwartz (1992) tarafından önerilen güdüsel çemberdeki konumlarının sınanmasıdır. Bilimsellik değerleri alanyazınından hareketle yaratıcılık, merak, şüphecilik, açık fikirlilik, akılcılık, nesnellik, müştereklik, bilimsel etik ve tutarlılık değerleri bilimsellik değerleri olarak tespit edilmiştir. Bu değerlerin önemini ölçmek amacıyla yazarlar tarafından maddeler geliştirilmiştir. Beş hipotezi sınamak amacıyla iki çalışma yapılmıştır. Birinci çalışmanın (N = 624, Ort.yaş = 22) bulguları bilimsellik değerlerinin görgül olarak Özyönelim ve Evrenselcilik değerleri arasında konumlandığını ve bilimsellik değerleri ile diğer değer tipleri arasındaki korelasyonların sinus dalgası şeklinde bir örüntü sergilediğini ortaya koymuştur. İkinci çalışmada ise (N = 181, Ort.yaş = 21.5) bilimsellik değerlerinin semantik farklılık maddeleri ile ölçülen bilime yönelik tutumlar ve bilme ihtiyacı puanları ile pozitif, belirsizliğe tahammülsüzlük puanları ile negatif korelasyon gösterdiği gözlenmiştir. Bu araştırma bilimsellik değerlerini, değerlerin çembersel yapısıyla entegre eden ilk çalışmadır. Bulguların bilimsellik değerlerinin hipotez edilmiş olan yapısını doğruladığı ve bilimsellik değerleri ölçümünün yakınsak ve ıraksak geçerliğe sahip olduğunu desteklediği tartışılmıştır. Kendi kendini seçme yanlılığı içerebilecek uygunluk örneklemleri kullanılması, verinin Türk üniversite öğrencilerinden toplanmış olması, ikinci çalışmada kadınların erkeklerden daha fazla temsil edilmiş olması ve bilimsellik değerleri dışındaki değer tipi ölçümlerinde düşük güvenirlik katsayıları gözlenmiş olması araştırmanın yöntemsel sınırlılıkları olarak kayda geçirilmiştir. Gelecekte yapılabilecek çalışmalarda, halihazırdaki araştırma bulgularının kültürlerarası çalışmalarla tekrarlanması ve bilimsellik değerlerinin, bu çalışmada kullanılanlar dışında kalan kişilik ölçümleri ile arasındaki ilişkilerinin incelenerek yakınsak geçerlik bulgularının genişletilmesi önerilmiştir.
Citation Count: 1
BIOINSPIRED CONCEPTUAL DESIGN (BICD): CONCEPTUAL DESIGN OF A GRASSHOPPER-LIKE JUMPING MECHANISM AS A CASE STUDY
(design Soc, 2011) Eroglu, Aylin Konez; Erden, Zuhal; Erden, Abdulkadir; Department of Mechatronics Engineering; Mechatronics Engineering
The evolution process of nature creates highly effective, power efficient, and perfectly structured biological systems. These excellent systems provide an inexhaustible source for engineers and scientists who desire to inspire ideas, processes, structures, functions, and behaviors from biological domain and implement them into engineering domain. This approach is called "Bioinspired" and challenging for engineers. However, some problems of the practical approaches are observed. One of the problems is "ad hoc" nature of the process. Each bioinspired design product has resulted in a differing design process and a generalization was not possible. Another problem rises due to the terminology difference between engineers and biologists. To overcome these problems, a need for a systematic bioinspired design (BID) process was realized in early 2000s and since then, considerable research on the BID methodology has been progressed. Within the context of BID, this paper introduces a new approach on bioinspired conceptual design (BICD) procedure for hybrid bioinspired robots which can be inspired from multiple biological systems. An illustrative case study is given in the paper.
Citation Count: 4
Biomechanical Design and Control of Lower Limb Exoskeleton for Sit-to-Stand and Stand-to-Sit Movements
(Ieee, 2018) Qureshi, Muhammad Hamza; Masood, Zeeshan; Rehman, Linta; Owais, Muhammad; Khan, Muhammad Umer; Mechatronics Engineering
In this paper, we present design and development phase of lower limb robotic exoskeleton that can assist paralyzed individuals. Motion of the human wearing exoskeleton is introduced by actuators. Both exoskeleton legs are attached to the supporting frame by passive universal joints. The exoskeleton provides 3 DOFs per limb of which two joints are active and one passive. The control actions i.e., sit-to-stand and stand-to-sit movements are triggered using Double Pole Double Throw (DPDT) toggle switch. The control scheme is implement using Switch control method and the feedback is provided by means of current measurement. This assistive device can be utilized for the disabled persons. The simulation results are provided that evaluates the performance of the control actions on exoskeleton.
Citation Count: 0
THE BORDERLINE BETWEEN SERIOUS GAMES AND SIMULATIONS
(Iated-int Assoc Technology Education & development, 2014) Guney, Sinem; Cagiltay, Nergiz Ercil; Tuner, Emre; Cereci, Ibrahim; Computer Engineering; Software Engineering
Game and simulation-based environments allow trainees to develop motor and cognitive skills as well as to provide some very detailed measurement values which in turn provide a feedback mechanism. It is a well known fact that games and simulation are potentially creating safer and cheaper active learning environments. Even when several benefits of games and simulations are reported in the literature, there is no exact definition of a game and simulation drawing the borders in between. Hence this causes to some complexities and misunderstandings in the field. Accordingly, in this study a definition for simulations and games is searched by being based on the studies found in the literature. Based on these definitions a borderline for the games and simulations will be provided. Results of study aim to guide the educational technology designers by better defining their education designs and better understanding their affect on the educational environments.
Citation Count: 0
CALCINATION BEHAVIOR OF SIVRIHISAR LATERITE ORES OF TURKEY
(John Wiley & Sons, 2011) Keskinkilic, Ender; Pournaderi, Saeid; Geveci, Ahmet; Topkaya, Yavuz A.; Metallurgical and Materials Engineering
This study investigated calcination behavior of one of the Turkish laterite deposits, which was recently found in Sivrihisar region. Representative limonitic laterite samples (1.26% Ni) taken from Yunusemre Karasivritepe and Kucuksivritepe location were first subjected to drying. Removal of chemically bound water and other volatiles were then studied, in detail. In the calcination experiments, temperature and time were the main experimental variables. Thermal treatment was conducted at the specific temperatures in 250 degrees C - 800 degrees C range. The weight losses due to elimination of chemically bound water and other volatiles were reported to be approximately 10 per cent of the weight of the ore. For the particle size used in the current work, 700 degrees C and 40 minutes were determined to be the optimum calcination temperature and time, respectively.
Citation Count: 0
A Casestudy of Data Models in Data Warehousing
(Ieee, 2008) Mishra, Deepti; Yazici, Ali; Basaran, Beril Pinar; Computer Engineering; Software Engineering
Data warehousing (DFV) provides an excellent approach in transforming operational data into useful and reliable information to support the decision making process in any organization. In this paper, a case study is performed to implement a DW. This case-study is used to describe and compare various conceptual and logical design models for data warehousing. This comparison is done to find which of the conceptual and logical data models are more appropriate for implementing data warehouse for sales and shipping system.

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