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Adaptive Shape From Shading, Ati̇lla Gülteki̇n, Muhi̇tti̇n Gökmen
Adaptive Shape From Shading, Ati̇lla Gülteki̇n, Muhi̇tti̇n Gökmen
Turkish Journal of Electrical Engineering and Computer Sciences
Extracting surface orientation and surface depth from one or more images is one of the classic problems in computer vision. Shape-from-shading (SFS) deals with the recovery of 3-D shape from a single shaded image. The shape is recovered by minimizing an energy functional involving constraints such as smoothness. In this constrained problem, although the smoothness constraint helps to stabilize the minimization process, it pushes the reconstruction toward a smooth surface. In this paper, we present a new adaptive shape-from-shading method which reduces this oversmoothing by controlling the smoothness spatially over the image space. In order to improve the quality of …
A Parallel Pipelined Computer Architecture For Digital Signal Processing, Haluk Gümüşkaya, Bülent Örenci̇k
A Parallel Pipelined Computer Architecture For Digital Signal Processing, Haluk Gümüşkaya, Bülent Örenci̇k
Turkish Journal of Electrical Engineering and Computer Sciences
This paper presents a parallel pipelined computer architecture and its six network configurations targeted for the implementation of a wide range of digital signal processing (DSP) algorithms described by both atomic and large grain data flow graphs. The proposed architecture is considered together with programmability, yielding a system solution that combines extensive concurrency with simple programming. It is an SSIMD (Skewed Single Instruction Multiple Data) or MIMD (Multiple Instruction Multiple Data) machine depending on the algorithms implemented and the programming methodologies. The concurrency that can be exploited by the algorithms using this Parallel pipelined architecture is both temporal and spatial …
Hierarchical Interconnection Network Architecture For Real-Time Systems, Bülent Örenci̇k
Hierarchical Interconnection Network Architecture For Real-Time Systems, Bülent Örenci̇k
Turkish Journal of Electrical Engineering and Computer Sciences
A hierarchical network suitable for interconnection of real-time client processes in a distributed multiprocessor environment is presented in this paper. A multi-layer {\it Communication Unit} (CU) prototype is developed for this purpose. This unit offers the client processes communication services for real-time operation. These services are structured in such a way that they do not depend on the characteristics of the communication medium. The basic hardware of the CU consists of a PC compatible card connected to the VME Bus. Client processes run on target cards (Motorola MVME-162) which are attached to the same bus. Target cards together with a …
Imaging Tissue Conductivity Via Contactless Measurements: A Feasibility Study, Nevzat G. Gençer, M. Nejat Tek
Imaging Tissue Conductivity Via Contactless Measurements: A Feasibility Study, Nevzat G. Gençer, M. Nejat Tek
Turkish Journal of Electrical Engineering and Computer Sciences
The feasibility of a new imaging system is investigated. This system will be used to image electrical conductivity distribution of biological tissues via contactless measurements. This will be achieved by introducing currents in the conductive medium using time-varying magnetic fields and measuring the magnetic fields of the induced currents. Consequently, the imaging system consists of transmitter and receiver coils placed nearby the conductive body. In this study, the basic features of the coplanar and coaxial coils are studied. The validity of the simplifying assumptions for the governing field equations is investigated. It is found that, for operating frequency of 100 …
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
Cover And Contents
Turkish Journal of Veterinary & Animal Sciences
No abstract provided.
The Effect Of Tamoxifen On The Neonataldevelopment Of Rat Penis, Engin Deveci̇, Yusuf Nergi̇z, Serap İnalöz, Murat Akkuş, M. Aydın Ketani̇, A. Reşit Ersay
The Effect Of Tamoxifen On The Neonataldevelopment Of Rat Penis, Engin Deveci̇, Yusuf Nergi̇z, Serap İnalöz, Murat Akkuş, M. Aydın Ketani̇, A. Reşit Ersay
Turkish Journal of Medical Sciences
In rats penis development a seen two stages in prenatal life, the second stage is androgen hormone dependent chondrocyte and osteocyte differentiation period. To investigate Tamoxifane (Tx) administration on the developmental anomalies of penis. The newborn male rats were injected with 100 µg Tamoxifen subcutaneously from the day of birth to fifth day. This changes in Os penis and glans penis were investigated after the rats had been sacrificed and their penis were removed on the days 14.0, 21.0, 28.0, 35.0 and 60.0 Having been fixed in neutral formaline of 10%, the totally taken penis werembedded into paraffin blocks. The …
Association Of Hla Type With Pseudoexfoliationof The Lens Capsule, Hakkı Doğan, Türkan Patiroğlu, Engin Baykal, Kuddusi Erkiliç
Association Of Hla Type With Pseudoexfoliationof The Lens Capsule, Hakkı Doğan, Türkan Patiroğlu, Engin Baykal, Kuddusi Erkiliç
Turkish Journal of Medical Sciences
Exfoliation of the lens capsule is asymptomatic but it is associated with the development of glaucoma and blindness if undetected and untreated. The occurrence of exfoliation varies widely in different countries where the population is ethnically homogeneous. It is suggested that both genetic and environmental influences are important in the development of exfoliative syndrome (ES). This study was carried out to determine if there was any relation between ES and HLA. HLA antigen types were determined in 45 patients with exfoliative syndrome. We found a strong association between HLA-A2, HLA-DR5, HLA B21 and HLA-DR7 and the existence of ES (Chi …
Helicobacter Pylori Seropositivity In Children Withrecurrent Abdominal Pain, Engin Günel, Duygu Findik, Fatma Çağlayan, Zerrin Topgaç
Helicobacter Pylori Seropositivity In Children Withrecurrent Abdominal Pain, Engin Günel, Duygu Findik, Fatma Çağlayan, Zerrin Topgaç
Turkish Journal of Medical Sciences
Recurrent abdominal pain (RAP) is a significant problem in pediatric patients, and there has been much recent interest in the role that Helicobacter pylori (Hp) might play in this disorder. The aim of the study was to determine the prevalance of Hp infection in children with RAP, and to determine whether there was an association between Hp and RAP. The study was conducted on 50 children with RAP and 20 asymptomatic children admitted for inguinal surgery as a control group. Serum samples from the 70 children were tested for anti-Hp Ig G and anti-Hp Ig A by ELISA. Of the …
Variations In Calcium, Phosphorus, Iron, Copper, Zinc And Manganese Contents Of Wheat Andrice Varieties Under Salt Stress, Mehmet Alpaslan, Aydın Güneş, Süleyman Taban, İbrahim Erdal, Ceyhan Tarakcioğlu
Variations In Calcium, Phosphorus, Iron, Copper, Zinc And Manganese Contents Of Wheat Andrice Varieties Under Salt Stress, Mehmet Alpaslan, Aydın Güneş, Süleyman Taban, İbrahim Erdal, Ceyhan Tarakcioğlu
Turkish Journal of Agriculture and Forestry
Variations in Ca, P, Fe, Cu, Zn and Mn contents of six wheat (Gerek, Bolal, Kıraç, Çakmak, Bezostaya and Kızıltan) and six rice varieties (Ribe, Tri-445, Serhat 92, Kros 424, Baldo and Rocca) under salt stress were investigated. Growth was inhibited by salinity. Salinity decreased P content of Kızıltan, while increased rice cultivars of Tri-445 and Kros 424. Iron contents of wheat cultivars of Gerek, Bolal and Kıraç and rice cultivars of Tri-445 and Rocca were decreased by salinity. In contrast to this, Iron contents of wheat cultivars of Çakmak and Bezostaya and rice cultivars of Ribe, Serhat 92, Kros …
The Effect Of Temperature Dependent Frequency Factor On The Evaluated Trapping Parameters Of Tsl Glow Curves, A. N. Yazici, Z. Öztürk
The Effect Of Temperature Dependent Frequency Factor On The Evaluated Trapping Parameters Of Tsl Glow Curves, A. N. Yazici, Z. Öztürk
Turkish Journal of Physics
The effect of temperature dependency on frequency factor and its relationship to trapping parameters is discussed by using the peak shape method. The coefficients appearing in the peak shape formula for the calculation of the activation energy have been determined and tabulated for the symmetry factor $\mu_g(X)$ for $x=0.50$ and 0.75 of the peak intensity. It is found that significant errors occur in the value of the trapping parameters if the temperature dependecy of the frequency factor is not consider.
Photoconductivity Studies Of Crystalline Si:H P-I-N, Ruhi Kaplan, Bengü Kaplan
Photoconductivity Studies Of Crystalline Si:H P-I-N, Ruhi Kaplan, Bengü Kaplan
Turkish Journal of Physics
Optically modulated photoconductivity (PC) properties of hydrogenated crystalline silicon (c-Si:H) with p-i-n junctions were investigated by frequency-resolved spectroscopy in the temperature range 20-290 K. The PC lifetime measurements of c-Si:H p-i-n show a second lifetime distribution which only dominates at low temperature under low illumination levels of excitation. Unlike the room temperature single lifetime distribution seen in c-Si:H p-i-n, the maximum of this second lifetime distribution shifts to longer times when the excitation intensity decreases, which reconciles with non-geminate pair recombination and thus the distant-pair model. In addition to lifetime measurements, the direct current-voltage (I-V) characteristics, the excitation light intensity- …
Analytical Expressions Of Matrix Elements For Saxon-Woods Potential And Pad'{E} Approximations, Valentin L. R. Niculescu, Dumitru Catana
Analytical Expressions Of Matrix Elements For Saxon-Woods Potential And Pad'{E} Approximations, Valentin L. R. Niculescu, Dumitru Catana
Turkish Journal of Physics
The paper presents the analytical matrix elements of the kinetic hamiltonian in the oscillator base. The Pad'{e} approximations for the potential part (Saxon - Woods and alike) was used. From residue calculus the potential matrix elements are analytical. Many parts of these expressions can be computed once for ever. In this way the evaluation time can be reduced and the relations obtained are well suited for parallel computation.
Domain Structures Of Epitaxial Perovskite Ferroelectric Films: Part Ii. Applications, S. Pamir Alpay, Alexander L. Roytburd
Domain Structures Of Epitaxial Perovskite Ferroelectric Films: Part Ii. Applications, S. Pamir Alpay, Alexander L. Roytburd
Turkish Journal of Physics
The use of domain stability maps for epitaxial perovskite ferroelectric films is illustrated with some examples. The equilibrium domain structure and domain fractions as a function of temperature are predicted for PbTiO_3(001) films grown epitaxially on three different substrates: MgO(001), KTaO_3(001), and SrTiO_3(001). Misfit dislocation formation at the growth temperature is found to have a profound effect on both the domain selection and relative domain populations. Theoretical predictions are compared with available experimental data.
^{19}F Nmr Study Of Flux-Line Dynamics In Fluorinated Yba_2cu_4o_8, Figen Tabak, Mavrizio Corti̇
^{19}F Nmr Study Of Flux-Line Dynamics In Fluorinated Yba_2cu_4o_8, Figen Tabak, Mavrizio Corti̇
Turkish Journal of Physics
Measurements of the ^{19}F NMR linewidth \Delta \nu and spin-lattice relaxation rate 1/T_1 have been performed in an oriented powder sample of fluorinated YBa_2Cu_4O_8 at temperatures 4 < T < 300 K and static magnetic fields 0.3 < H_0 < 9.4 T for Hollc. Thermal motion of flux lines was evidenced from the effect on NMR linewidth while 1/T_1 showed the effects due to interaction with Fermi liquid.