Marangoz, AM | Buyuksalih, G | Buyuksalih, I | Sefercik, UG | Akcin, H

Konferans nesnesi | 2005 | RAST 2005: Proceedings of the 2nd International Conference on Recent Advances in Space Technologies , pp.505 - 510

A cloud-free ASTER scene combination covering 61.5km x 63km Zonguldak testfield in the north-west Turkey has been analysed. It comprises the nadir and backward views with a base-to-height ratio of 0.6. The pixel size on the ground is 15m. The bundle orientation was executed with the related module of PCI Geomatica V9.1.4 software package and resulted the 3D geo-positioning to an accuracy of about 14m in planimetry and 13m in height. This level of accuracy can be provided using the number of GCPs up to 14 which are distributed over the scene uniformly. Based on the scene orientation, a DEM of the area has been determined by an automa . . .tic image matching and PCI system yielded a DEM with 30m cell size. For the validation of extracted DEM, different groups of GCPs selected over the testfield were utilized. In this analysis, GCPs were located in the raster DEM in according to their planimetric coordinates, then the heights are estimated by the bilinear interpolation of the neighboured grid cells. This was done by the program DEMINT and mean square differences was obtained in the range of 12 to 14m. Moreover., matched DEM was checked against reference DEM based on digitised contour lines from the 1:25000 scale topographic maps using program DEMANAL. The discrepancies between the two DEMs were determined as reference DEM minus matched DEM. Then positive biases resulted which show that matched DEM occurred under the reference DEM. These biases appeared also in the superimposition of contours from two DEMs. Image of DZ discrepancies is dispayed as a function of grey values as well and highest residuals occurred mainly at the ridges. In the meantime, RMSE-Z from the comparison of both DEMs obtained very close in the range of +/- 21-22m. Finally, orthoimage was generated using matched DEM and nadir image component of ASTER stereopair without problem. Planimetric accuracy check of this product was realized using the GCPs and shows no systematic error pattern overall Daha fazlası Daha az

Karakis, S | Topan, H | Buyuksalih, G | Marangoz, A | Jacobsen, K

Konferans nesnesi | 2005 | RAST 2005: Proceedings of the 2nd International Conference on Recent Advances in Space Technologies , pp.500 - 504

From the area around Zonguldak several space images with different ground sampling distance (GSD) from 30m down to 62cm are available. The semantic information of Landsat images is too poor for the generation of topographic maps, while QuickBird images do allow a mapping in the scale I : 5000. Not only the GSD is determining the possible map scale, also the spectral and radiometric resolution is important. The imaging conditions, especially the sun elevation with the corresponding length of shadows, do lead to quite different results especially in cities with narrow streets. The possibilities and limitations of mapping with the diff . . .erent space images, partially with the same image type taken in different month, has been analysed Daha fazlası Daha az

Oeztuerk, Ertan | Yilmaz, Ergin

Konferans nesnesi | 2007 | 2007 IEEE 15TH SIGNAL PROCESSING AND COMMUNICATIONS APPLICATIONS, VOLS 1-3 , pp.584 - 587

In this paper, the probabilities of error performances of bipolar Direct Sequence Ultra Wide Band (DS-UWB) signals are investigated over a log-normal fading channel. Since the bandwidth of UWB signals is in the level of giga Hertz, the number of the resolvable paths in the channel is large. Consequently, in the receiver, a Rake receiver in conjunction with a maximum ratio combiner is used. By using the derived probability of error expression, the numerical values of the performances are calculated for the first derivative of Gaussian, the second derivative of Gaussian, Rayleigh and Daubechies-5 (db-5) pulse signals. Results show tha . . .t the db-5 pulse based UWB system gives the best performance Daha fazlası Daha az

Aydin, R. Seda Tigli | Uyanik, Seda

Konferans nesnesi | 2016 | 2016 20TH NATIONAL BIOMEDICAL ENGINEERING MEETING (BIYOMUT) , pp.584 - 587

Infection and nonunion following fracture fixation remain as unsolved problems of orthopaedic surgery. This condition may lead to implant failures and necessitate further surgical interventions, ending up with increased morbidity and treatment costs. In this study, 316L stainless steel bone plates were coated with stronsiyum containing bone like hydroxyapaptite (HA) (1. Layer) and silver enriched polylactic acid coating (2. Layer). Thus, firstly, 2.0 mm. routinely used fracture fixation plates were first coated by immersing strontium containing simulated body fluid (x10) in order to nanocoat with HA layer. Then, plates will be coate . . .d with Ag enriched PLA and their surface properties will were characterized Daha fazlası Daha az

Kayikcioglu, Ilknur | Akdeniz, Fulya | Kayikcioglu, Temel

Konferans nesnesi | 2016 | 2016 24TH SIGNAL PROCESSING AND COMMUNICATION APPLICATION CONFERENCE (SIU) , pp.2045 - 2048

While the world's population is growing, average life expectancy is increasing. As a result, the growing elderly population is profoundly affecting the delivery of healthcare for everyone and in particular for those with chronic diseases. The remote monitoring of chronic patients may be achieved by a telemedicine system utilizing today's information and mobile communication technologies. In this study, an ECG arrhythmia detection algorithm based on Wigner-Ville distribution is developed., The performance of the method is tested on data obtained from the PhysioNet database.

Uzun, Rukiye | Isler, Yalcini | Toksan, Mualla

Konferans nesnesi | 2018 | 2018 INNOVATIONS IN INTELLIGENT SYSTEMS AND APPLICATIONS CONFERENCE (ASYU) , pp.1 - 4

Warts are virus-based dermatosis that are common in the society. In this study, it was predicted if the method to be applied in the treatment of warts will success or not using a machine learning method. For this purpose, two online and freely available datasets of 180 patients with common warts and plantar warts, who are treated with cryotherapy and immunotherapy methods, were used together. As a result, the algoerithm of support vector machines predicted whether the selected treatment success with an accuracy of 85.46%.

Karasu, Seckin | Baskan, Saim

Konferans nesnesi | 2016 | 2016 24TH SIGNAL PROCESSING AND COMMUNICATION APPLICATION CONFERENCE (SIU) , pp.529 - 532

In this paper, 11 different power quality disturbances were automatically detected by using statistical features with wavelet transform and norm entropy techniques. The best of the created features were selected with forward selection algorithm. Performance of classification algorithms, Support Vector Machines (SVM), Multi Layer Perceptron (MLP), k Nearest Neighbor (KNN) and random subspace KNN (Sub-KNN) which is an ensemble method, were examined. Consequently, the best classification accuracy of 99.3% was achieved by using Sub-KNN and it was appeared that compared to other methods, this algorithm was more robust against the noise.

Oturak, Ahmet | Ozturk, Ertan | Demirkol, Askin

Konferans nesnesi | 2009 | 2009 IEEE 17TH SIGNAL PROCESSING AND COMMUNICATIONS APPLICATIONS CONFERENCE, VOLS 1 AND 2 , pp.529 - 532

In literature, the performance of Direct Sequence Code Division Multiple Access (DS-CDMA) systems over multipath fading channels are evaluated by using Standard Gaussian Approximation (SGA) and Simplified Expression of Improved Gaussian Approximation (SEIGA). Especially, time-limited DS-CDMA chip waveforms are employed in the analysis by using SEIGA. In this work, the performance analysis of DS-CDMA signals having time-limited and band-limited (used in third generation communication) chip waveforms are conducted over multi-path Rayleigh fading channels by utilizing SEIGA method. The effects of classical time-limited chip waveforms a . . .nd band-limited square root raised cosine (SRRC) on the Bit Error Rate (BER) performance are compared. The obtained numerical results show that time-limited raised cosine gives the best performance, whereas band-limited SRRC gives the worst in terms of the BER over Rayleigh fading channels Daha fazlası Daha az

Tanyeri, Ufuk | Incetas, Mursel Ozan | Demirci, Recep

Konferans nesnesi | 2016 | 2016 24TH SIGNAL PROCESSING AND COMMUNICATION APPLICATION CONFERENCE (SIU) , pp.1401 - 1404

Different filter methods to reduce noises occurred during image capture have been developed. One of the most effective image filters is diffusion filter. However, the major drawback of conventional diffusion filter is user-dependent. While noises are reduced with conductance coefficient arbitrarily selected, edge pixels are perceived such as noise. In this study, a novel anisotropic diffusion filter using similarity values obtained with the distance of each pixel to its neighbors has been proposed. Initially, similarity values of all image pixels are computed, and then they are used as conductance coefficients in diffusion filter. T . . .he mentioned value above is user dependent for conventional diffusion and it is constant for all pixels. On the other hand, it is made adaptive and eliminated user intervention with suggested approach. Developed method has been tested with different noise variances of images and experimental results have been compared with conventional diffusion filter Daha fazlası Daha az

Deguchi, Tomonori | Kato, Masatane | Akcin, Hakan | Kutoglu, Hakan S.

Konferans nesnesi | 2007 | IGARSS: 2007 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM, VOLS 1-12: SENSING AND UNDERSTANDING OUR PLANET , pp.1401 - 1404

In this study, we applied InSAR technique to Zonguldak Hardcoal Basin in Republic of Turkey using JERS1/SAR, RADARSAT and PALSAR data in order to monitor mining induced surface displacement.

Aytekin, Gursu | Topan, Huseyin | Elkar, Yunus Emre | Kisi, Metehan | Erisik, Onur

Konferans nesnesi | 2019 | 2019 9TH INTERNATIONAL CONFERENCE ON RECENT ADVANCES IN SPACE TECHNOLOGIES (RAST) , pp.821 - 826

Gokturk-1 is the first sub-meter earth observation satellite of Turkey, launched on December 5th, 2016, and is operated by Turkish Air Forces. It has capability of pushbroom imaging system acquiring panchromatic and visible&near infrared images with 0.5 m and 2 m resolutions, respectively, in 15 km swath width. The main aim of this study is to analyze the 2D orientation accuracy in image-space for Gokturk-1 panchromatic level 2A imagery covering an undulating topography. For this purpose, Zonguldak test site which has mountainous and inclined topographies and dense settlement and forest was selected. Elevation ranges roughly varies . . .from sea level to 1800 m. Various sensor independent orientation models and sensor dependent Rational Functional Model (RFM) were used as the mathematical models with 76 Ground Control Points (GCPs) collected by Global Navigation Satellite System (GNSS) observations covered Zonguldak Test Site. All points were used as GCPs. The primary results showed that 2D orientation accuracy in image space is could be achieved about +/- 1 pixel using RFM without systematic error Daha fazlası Daha az

Akgul, Volkan | Jin, Shuanggen | Gurbuz, Gokhan

Konferans nesnesi | 2017 | 2017 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) , pp.4417 - 4420

The precipitable water vapor (PWV) can be estimated from dual-frequency GPS observations, which has been widely used for atmospheric study and weather forecasting. However. high-order ionospheric delays are normally ignored in GPS applications. In this paper, high-order ionospheric effects on GPS-estimated precipitable water vapor are investigated from 30 days of GPS data in June 2011 at 8 GPS stations in Turkey. Firstly, the second- and third-order effects on GPS data are corrected in RINEX using IGRF11 model. and then the precipitable water vapor (PWV) is obtained from raw and corrected RINEX data with GAMIT software. Results show . . . that high-order ionospheric effects arc up to 1 millimeter on PWV during this period. Solar activity is an important effect on ionospheric activities. When data during the peak solar activity days arc used for same stations in 2011, high-order ionospheric effects on PWV is increasing, while low solar activities, high-order ionospheric effects arc much smaller Daha fazlası Daha az