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Search Results: 1 - 10 of 616 matches for " Orhan Onalan "
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Nebivolol And Quinapril Reduce P-Wave Duration And Dispersion In Hypertensive Patients
Hasan Korkmaz,Orhan Onalan,Mehmet Akbulut,Y?lmaz Ozbay
Indian Pacing and Electrophysiology Journal , 2009,
Abstract: We aimed to investigate the effects of nebivolol and quinapril treatments on P-wave duration and dispersion in hypertensive patients. Hypertensive patients who were in sinus rhythm were assigned to the two treatment groups and received either 20 mg quinapril/day or 5 mg nebivolol/day. P-Wave dispersion (PWD) was measured at baseline and after four weeks of treatment and defined as the difference between the maximum (Pmax) and the minimum (Pmin) P-wave duration. The study group consisted of 54 patients (Mean age: 53 ± 9 years, 46% women) with 27 patients in each group. At 4-week follow up both treatment groups showed a significant reduction (p<0.001) in systolic (SBP) and diastolic blood pressure (DBP). Heart rate (HR) reduction was significant in patients receiving nebivolol (P=0.001). Both groups showed a similar (P=0.413 for PWD, p=0.651 for Pmax) but significant reduction in PWD (nebivolol: -16±14, P<0.0001 and quinapril: -13±11, P<0.0001) and Pmax (nebivolol: -10±11, P=0.001 and quinapril: -9±11, P=0.001). A 2 (Time) x 2 (Group) mixed-model repeated-measures analysis of variance revealed that the main effect of Time was significant for Pmax (P=0.002) and PWD (P=0.008) after controlling for changes in SBP, DBP and HR. However, the main effect of Group and Time x Group interaction was not significant for both variables (All p values >0.05). In conclusion, short-term treatment with nebivolol and quinapril produces a similar but significant reduction in Pmax and PWD in hypertensive patients. This effect is independent of blood pressure and heart rate changes.
A prominent Chiari network prolapsing into right ventricle
Lutfu Bekar,Orhan Onalan,Fatih Altunkas,Hasan Atmaca
Anadolu Kardiyoloji Dergisi , 2008,
Abstract:
Financial Modelling with Ornstein - Uhlenbeck Processes Driven by Levy Process
Omer Onalan
Lecture Notes in Engineering and Computer Science , 2009,
Abstract:
Pure -Jump Levy Processes and Self-decomposability in Financial Modeling
Omer Onalan
Journal of Mathematics Research , 2011, DOI: 10.5539/jmr.v3n2p41
Abstract: In this study, we review the connections between L'{e}vy processes with jumps and self-decomposable laws. Self-decomposable laws constitute a subclass of infinitely divisible laws. L'{e}vy processes additive processes and independent increments can be related using self-similarity property. Sato (1991) defined additive processes as a generalization of L'{e}vy processes. In this way, additive processes are those processes with inhomogeneous (in general) and independent increments and L'{e}vy processes correspond with the particular case in which the increments are time homogeneous. Hence L'{e}vy processes are considerable as a particular type. Self-decomposable distributions occur as limit law an Ornstein-Uhlenbeck type process associated with a background driving L'{e}vy process. Finally as an application, asset returns are representing by a normal inverse Gaussian process. Then to test applicability of this representation, we use the nonparametric threshold estimator of the quadratic variation, proposed by Cont and Mancini (2007).
New Silk Routes: Pipe Lines and Terminal Markets  [PDF]
Ayhan Orhan
Open Journal of Political Science (OJPS) , 2013, DOI: 10.4236/ojps.2013.31008
Abstract:

Energy will be the main determinant of the economic and political relations between the regions and nations during the years to come. The need for energy and the consumption of energy related to this need continues increasingly. The fossil fuels which meet the energy of many of the growing economies in the world, especially Chinabeing in the first place will continue to be the main energy source until the year2050. Intoday’s world, countries are classified as those which have rich reserves of natural resources and which obtain most of their revenues by selling these natural resources, those which have large amounts of consumption of natural resources and which import natural resources in spite of their own natural resources and as those which are dependant on outside resources but are on the route of transmission of natural resources because of their geopolitical positions. Turkey’s place is in the third group.Turkeyis the leading country among the countries which are situated on the route of the transmission of the natural resources.Turkeyis in a geographical region where its neighbors have rich natural resources, and this geographical region has approximately 70% of the fossil fuels which comprise a great deal of the energy needs in the whole world. Therefore, Turkey is at the center of the transmission corridor of the natural resources between the north and the south, and between the west and the east. TheUnited States of Americainstalled itself and settled down in the region at the beginning of the 90’s because of the first Gulf War, and theUnited Stateshas taken steps and some measures in order to support the establishment of new pipeline corridors for the transmission of natural resources. In the background of this support lies the thought and idea that by virtues of these pipelines the natural resources that exist in the Central Asian countries should be transmitted to the western world countries and to the international markets without any need for dependence onRussia. Another idea behind this is to put an end to the dominance of Russia over these countries.


Analysis of Teachers’ Attitude towards Internet Use: Example of Chemistry Teachers  [PDF]
Mehmet Tekerek, Orhan Ercan
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.33047
Abstract: Web technology is changing rapidly every day and the Internet has become a lifestyle for people all over the world. It is obvious that the life style of societies is in a process of change, as new habits are acquired. Even though Internet use is one of the new social habits, it is one of the most important factors that induce this change as regards the convenience it brings to communication and other areas. The widespread use of Internet implies the idea that it can also be more widely used for educational purpose. Since chemistry teachers have a very important function in education, the determination of teachers’ attitude towards Internet use is also important. In the literature it is possible to see many studies on teacher candidates’ attitude towards Internet use; however studies on appointed teachers’ attitude are not very common. In our study, which aims to determine the attitude of appointed chemistry teachers according to different variables, we used the Internet use attitude scale. Participant teacher’s attitude towards Internet use was analyzed and interpreted according to the variables of gender, years on the job, type of school at which they are teaching, and duration of their weekly Internet use. It was seen that a vast majority of the teachers have personal computers, they connect to Internet at home and have positive attitude towards Internet use. It was also seen that female teachers have more positive attitude than male teachers in use of Internet for social interaction and communication.
An Improved Ant Colony Optimization Algorithm for Construction Site Layout Problems  [PDF]
Gulben Calis, Orhan Yuksel
Journal of Building Construction and Planning Research (JBCPR) , 2015, DOI: 10.4236/jbcpr.2015.34022
Abstract: Meta-heuristic algorithms proved to find optimal solutions for combinatorial problems in many domains. Nevertheless, the efficiency of these algorithms highly depends on their parameter settings. In fact, finding appropriate settings of the algorithm’s parameters is considered to be a nontrivial task and is usually set manually to values that are known to give reasonable performance. In this paper, Ant Colony Optimization with Parametric Analysis (ACO-PA) is developed to overcome this drawback. The main feature of the ACO-PA is the ability of deciding the appropriate parameter values within the predefined parameter variations. Besides, a new approach which enables the pheromone information value to be proportional to the heuristic information value is introduced. The effectiveness of the proposed algorithm is investigated through the application of the algorithm to the construction site layout problems taken from the state-of-art. Results show that the ACO-PA can reduce transportation cost up to 16.8% compared to the site layouts generated by Genetic Algorithms and basic ACO. Moreover, the effects of parameter settings on the generated solutions are investigated.
Human Menopausal Gonadotropin versus Recombinant FSH in Polycystic Ovary Syndrome Patients Undergoing In Vitro Fertilization
Ayse Figen Turkcapar,Berna Seckin,Gogsen Onalan,Tulin Ozdener
International Journal of Fertility & Sterility , 2013,
Abstract: Background: We aimed to compare human menopausal gonadotropin (hMG) and recombinantfollicle-stimulating hormone (r FSH) with respect to clinical outcomes and the development ofovarian hyperstimulation syndrome (OHSS) for patients with polycystic ovary syndrome (PCOS)treated with in vitro fertilization (IVF).Materials and Methods: This prospective randomized controlled trial included a total of 80 womenwith PCOS. Of these, 38 were randomized to receive treatment with hMG and 42 with rFSH usinga long gonadotropin releasing hormone (GnRH) analogue protocol. Outcome measures were cyclecharacteristics, pregnancy rates, the need for coasting, and OHSS rates.Results: In the hMG group we observed a significantly lower peak estradiol (E2) level (p=0.02),fewer intermediate-sized follicles (p=0.001), lower number of oocytes retrieved (p=0.002) andmetaphase II (MII) oocytes (p=0.003). However, there were no significant differences between thegroups in the number of fertilized oocytes, fertilization rates, top quality embryo counts, and thenumber of transferred embryos. There was no difference in pregnancy rates between the groups.OHSS occurred in 11.9% of the rFSH group patients, whereas no OHSS developed in the hMGgroup. Coasting requirements were lower in the hMG group (19.2% vs. 48.9%, p=0.013).Conclusion: Ovarian stimulation with hMG and rFSH provides similar clinical pregnancy rates inPCOS patients treated with a long GnRH agonist protocol in IVF cycles. hMG stimulation appearsto be associated with a lower rate of OHSS and decreased coasting requirements (RegistrationNumber: NCT01365936).
Heteroskedasticity-Consistent Covariance Matrix Estimators in Small Samples with High Leverage Points  [PDF]
Esra ?im?ek, Mehmet Orhan
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.64071
Abstract: The aim of this paper is to demonstrate the impact of high leverage observations on the performances of prominent and popular Heteroskedasticity-Consistent Covariance Matrix Estimators (HCCMEs) with the help of computer simulation. Firstly, we figure out high leverage observations, then remove them and recalculate the HCCMEs without these observations in order to compare the HCCME performances with and without high leverage points. We identify high leverage observations with the Minimum Covariance Determinant (MCD). We select from among different covariates and disturbance term variances from the related literature in simulation runs in order to compare the percentage difference between the expected value of the HCCME and true covariance matrix as well as the symmetric loss function. Our results revealed that the elimination of high leverage (high MCD distance) observations had improved the HCCME performances considerably and under some settings substantially, depending on the degree of leverage. We hope our theoretical findings will be benefited for practical purposes in applications.
Sheep Behaviours During a Total Solar Eclipse
Orhan ?zbey
Journal of Animal and Veterinary Advances , 2012,
Abstract: In this study, the effects of a total solar eclipse, which was occurred in Elaz?? on August 11 1999, on sheep behaviours, were observed. For this purpose, 150 sheeps open shelter have been observed for six hour, from 11:00 am to 5:00 pm. All behaviours of sheep that were different than usual were recorded during observation. Sheeps started to show different behaviours including standing up, smelling the weather and watching around 30 minutes before solar eclipse. Total solar eclipse was occurred between 2:37 and 2:39 pm. During total solar eclipse, it was observed that they become very quiet did not move, turned their faces to the sun. During solar eclipse, sheep behaviour was obseved different than normal sunset darkness. Sheep might behave similar during earthquake disaster with solar eclipse.
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