WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653

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Citation - WoS: 1
Citation - Scopus: 4
A Comparative Evaluation Of Popular Search Engines On Finding Turkish Documents For A Specific Time Period
(Univ Osijek, Tech Fac, 2017) Bitirim, Yiltan; Gorur, Abdul Kadir; 107251; Bilgisayar Mühendisliği
This study evaluates the popular search engines, Google, Yahoo, Bing, and Ask, on finding Turkish documents by comparing their current performances with their performances measured six years ago. Furthermore, the study reveals the current information retrieval effectiveness of the search engines. First of all, the Turkish queries were run on the search engines separately. Each retrieved document was classified and precision ratios were calculated at various cut-off points for each query and engine pair. Afterwards, these ratios were compared with the six years ago ratios for the evaluations. Besides the descriptive statistics, Mann-Whitney U and Kruskal-Wallis H statistical tests were used in order to find out statistically significant differences. All search engines, except Google, have better performance today. Bing has the most increased performance compared to six years ago. Nowadays: Yahoo has the highest mean precision ratios at various cut-off points; all search engines have their highest mean precision ratios at cut-off point 5; dead links were encountered in Google, Bing, and Ask; and repeated documents were encountered in Google and Yahoo.
Citation - WoS: 6
Citation - Scopus: 8
A Real Time Data Warehouse Approach for Data Processing
(Ieee, 2013) Obali, M.; Dursun, B.; Erdem, Z.; Görür, A.K.; 107251; Bilgisayar Mühendisliği
Data that is acquired from different data sources needs too much processing for managing, analyzing and monitoring. Also, you have to fuse and exploit efficiently these data and display the results. Data warehouse consolidates data coming from different data sources. A real time data warehouse is used same purpose as data warehouse, in addition to these, data streams into real time data warehouse on time. Therefore, real time data warehouses can be used in many different areas, such as signal processing, data analysis. In this study, we proposed and implement a real time data warehouse using web services as a prototype. © 2013 IEEE.
Citation - WoS: 2
Citation - Scopus: 3
Single-Machine Scheduling of Indivisible Multi-Operatıon Jobs
(Southern African inst industrial Engineering, 2019) Cetinkaya, F. C.; Catmakas, H. A.; Gorur, A. K.; 50129; 57532; 107251; Endüstri Mühendisliği; Bilgisayar Mühendisliği
This paper considers a single-machine scheduling problem of multi-operation jobs where each job consists of several operations processed contiguously, rather than being intermingled with the operations of different jobs. That is, the jobs are indivisible. A sequence-independent setup is required if the machine switches from one operation to another. However, no setup is necessary before the first operation of a job if this first operation is the same as the last operation of the immediately previous job. A job is complete when all of its operations have been processed. We investigate the problem for two cases. Makespan, which is the time needed to complete all jobs, is minimised in the first case; whereas the total completion time, which is the sum of the job completion times, is minimised in the second case. We show that the makespan problem is solvable in polynomial time. For the problem of minimising total completion time, we develop a mixed integer linear programming (MILP) model, which is capable of solving small and medium-sized problem instances optimally, and obtain a very small gap between the solution found and the best possible solution for the unsolved large-sized problem instances.

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