oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2017 ( 1 )

2016 ( 1 )

2015 ( 5 )

2014 ( 10 )

Custom range...

Search Results: 1 - 10 of 283 matches for " Mahmut Guneri "
All listed articles are free for downloading (OA Articles)
Page 1 /283
Display every page Item
Differences in left ventricular structure, functions and elastance in the patients with normotensive blood pressure
Mehmet Tolga Dogru,Emine Tireli,Mahmut Guneri,Atila Iyisoy
Anadolu Kardiyoloji Dergisi , 2008,
Abstract: Objective: We aimed in this study to investigate the differences in left ventricular (LV) structure, function and elastance parameters in the patients with normotensive blood pressure (BP) levels.Methods: A total of 294 normotensive patients (<140/90 mmHg) (135 males, mean age: 45±11 years; 159 females, mean age 38±10 years) were enrolled into the present cross-sectional study. Patients were categorized into three groups according to their BP levels as optimal BP (<120/80 mmHg), normal BP (120-129 / 80-84 mmHg) and high normal BP (129-139 / 84-89 mmHg) groups. We evaluated LV structure and functions by using Doppler echocardiography in all participants. Afterwards we compared the measurements for revealing the echocardiographic differences among the BP groups. In this study, one-way ANOVA Kruskal-Wallis, one-way ANCOVA and partial correlation analysis tests were used for the statistically evaluation of the data. In addition, relative risk ratios (RR) were also calculated for determination of the effects of BP levels to echocardiographic parameters.Results: There were significant statistical differences in left atrial diameter (LA) (p=0.002), transmitral A wave velocity (A) (p=0.002), meridional wall stress (MWS) (p<0.001), pulmonary capillary wedge pressure (PCW) (p=0.029) among BP groups. After the correction of the data for anthropometric measurements, multiple comparisons have shown that only end-systolic (Es) and end-diastolic elastance (Ed) were different between the normal and high-normal BP groups (for Es, p=0.013; for Ed, p=0.007). But it was found that optimal BP group had significant differences in LV structure and function parameters when compared to high normal BP group (for LA, p=0.028; for A, p=0.035; for MWS, p=0.002; for Es, p<0.001; for Ed, p<0.001). Besides, increased RR were detected for increased left atrial diameter index and pulmonary capillary wedge pressure values in high-normal BP group (RR: 1.537, 95% CI (1.197-1.974), p=0.005 and RR: 1.272, 95% CI (1.089-1.485), p=0.032, respectively).Conclusion: Pathologic changes in LV due to increasing BP begin at below-hypertensive BP levels. It could be possible that normal BP stage is the beginning level of these changes.
Animals as Mobile Biological Sensors for Forest Fire Detection
Yasar Guneri Sahin
Sensors , 2007, DOI: 10.3390/s7123084
Abstract: This paper proposes a mobile biological sensor system that can assist in earlydetection of forest fires one of the most dreaded natural disasters on the earth. The main ideapresented in this paper is to utilize animals with sensors as Mobile Biological Sensors(MBS). The devices used in this system are animals which are native animals living inforests, sensors (thermo and radiation sensors with GPS features) that measure thetemperature and transmit the location of the MBS, access points for wireless communicationand a central computer system which classifies of animal actions. The system offers twodifferent methods, firstly: access points continuously receive data about animals’ locationusing GPS at certain time intervals and the gathered data is then classified and checked tosee if there is a sudden movement (panic) of the animal groups: this method is called animalbehavior classification (ABC). The second method can be defined as thermal detection(TD): the access points get the temperature values from the MBS devices and send the datato a central computer to check for instant changes in the temperatures. This system may beused for many purposes other than fire detection, namely animal tracking, poachingprevention and detecting instantaneous animal death.
Comparison of fatigue behaviour of eight different hip stems: a numerical and experimental study  [PDF]
Mahmut Pekedis, Hasan Yildiz
Journal of Biomedical Science and Engineering (JBiSE) , 2011, DOI: 10.4236/jbise.2011.410080
Abstract: In this study, finite element analysis was used to investigate the fatigue behavior of eight different hip stems. All of the prostheses investigated in the analysis are already being used in Turkish orthopaedic surgery. All stems were compared with each other in terms of fatigue, deformation and safety factors. Primary analysis was applied on three of the stems, which were tested experimentally. It was observed that the simulation and the experimental results are in good agreement with each other. After determining the reliability of the numerical method, the analysis was applied on all other stems. To obtain a more realistic simulation, boundary conditions were applied according to standards specified in the ISO 7206-4 standard. Three different types of materials were selected during analysis. These materials were Ti-6Al-4V, cobalt chrome alloy and 316L. Minimum fatigue cycles, critical fatigue areas, stresses and safety factor values have been identified. The results obtained from the finite element analysis showed that all stems were safe enough in terms of fatigue life. As a result of fatigue analysis, all stems have been found to be successful, but some of them were found to be better than the others in terms of safety factor. The current study has also demonstrated that analysing hip stems with the finite element method (FEM) can be applied with confidence to support standard fatigue testing and used as an alternative. Further studies can expand the simulations to the clinical relevance due to complex physical relevance.
Teachers’ Professional Development Needs and the Systems That Meet Them  [PDF]
Mahmut Sa??r
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.516167
Abstract: The purpose of this study was to identify professional development needs of primary and secondary school teachers and to present their views on the systems that meet those needs. The research model utilized in the study was the mixed model type. Findings related to identification of teachers’ professional development needs were collected through quantitative methods whereas findings related to systems that meet those needs were collected qualitatively. The study utilized survey model since it identified teachers’ professional development needs and investigated the systems that meet those needs. The part of the study related to identification of teachers’ professional development needs was quantitative and the section that investigated the systems that met professional development needs was qualitative. Data regarding the quantitative part of the study was collected with a data collection tool composed of 34 items prepared by the researcher and the data regarding the qualitative part of the study was collected, a 5-item data collection tool prepared by the researcher. Working group was composed of a total of 207 teachers selected via “simple random sampling” from the universe. Results showed that teachers needed development in the following areas mostly: “extracurricular and classroom activities”, “instructional programs and evaluation”, “teacher-student relationships” and “organization of instructional environments”. Teacher stated that they met their professional development needs in the following order from the most to least: through own individual studies, social learning among colleagues, in-service training, school administration and educational inspection.
Detection of Hidden Hostile/Terrorist Groups in Harsh Territories by Using Animals as Mobile Biological Sensors
Yasar Guneri Sahin,Tuncay Ercan
Sensors , 2008, DOI: 10.3390/s8074365
Abstract: Terrorism is the greatest threat to national security and cannot be defeated by conventional military force alone. In critical areas such as Iraq, Afghanistan and Turkey, regular forces cannot reach these hostile/terrorist groups, the instigators of terrorism. These groups have a clear understanding of the relative ineffectiveness of counter-guerrilla operations and rely on guerrilla warfare to avoid major combat as their primary means of continuing the conflict with the governmental structures. In Internal Security Operations, detection of terrorist and hostile groups in their hiding places such as caves, lairs, etc. can only be achieved by professionally trained people such as Special Forces or intelligence units with the necessary experience and tools suitable for collecting accurate information in these often harsh, rugged and mountainous countries. To assist these forces, commercial micro-sensors with wireless interfaces could be utilized to study and monitor a variety of phenomena and environments from a certain distance for military purposes. In order to locate hidden terrorist groups and enable more effective use of conventional military resources, this paper proposes an active remote sensing model implanted into animals capable of living in these environments. By using these mobile sensor devices, improving communications for data transfer from the source, and developing better ways to monitor and detect threats, terrorist ability to carry out attacks can be severely disrupted.
Early Forest Fire Detection Using Radio-Acoustic Sounding System
Yasar Guneri Sahin,Turker Ince
Sensors , 2009, DOI: 10.3390/s90301485
Abstract: Automated early fire detection systems have recently received a significant amount of attention due to their importance in protecting the global environment. Some emergent technologies such as ground-based, satellite-based remote sensing and distributed sensor networks systems have been used to detect forest fires in the early stages. In this study, a radio-acoustic sounding system with fine space and time resolution capabilities for continuous monitoring and early detection of forest fires is proposed. Simulations show that remote thermal mapping of a particular forest region by the proposed system could be a potential solution to the problem of early detection of forest fires.
Detection of Hidden Hostile/Terrorist Groups in Harsh Territories by Using Animals as Mobile Biological Sensors
Yasar Guneri Sahin,Tuncay Ercan
Sensors , 2008,
Abstract: Terrorism is the greatest threat to national security and cannot be defeated by conventional military force alone. In critical areas such as Iraq, Afghanistan and Turkey, regular forces cannot reach these hostile/terrorist groups, the instigators of terrorism. These groups have a clear understanding of the relative ineffectiveness of counter-guerrilla operations and rely on guerrilla warfare to avoid major combat as their primary means of continuing the conflict with the governmental structures. In Internal Security Operations, detection of terrorist and hostile groups in their hiding places such as caves, lairs, etc. can only be achieved by professionally trained people such as Special Forces or intelligence units with the necessary experience and tools suitable for collecting accurate information in these often harsh, rugged and mountainous countries. To assist these forces, commercial micro-sensors with wireless interfaces could be utilized to study and monitor a variety of phenomena and environments from a certain distance for military purposes. In order to locate hidden terrorist groups and enable more effective use of conventional military resources, this paper proposes an active remote sensing model implanted into animals capable of living in these environments. By using these mobile sensor devices, improving communications for data transfer from the source, and developing better ways to monitor and detect threats, terrorist ability to carry out attacks can be severely disrupted.
Usability of Polymer Concrete as a Machine-Making Material Regarding Fatigue Strength  [PDF]
Ergun Ate?, Mahmut Nedim Gerger
World Journal of Engineering and Technology (WJET) , 2013, DOI: 10.4236/wjet.2013.13009
Abstract: In many studies conducted on polymer concretes of different structures, some of the mechanical behaviours such as compression, bending, damping, and fatigue have been investigated. Specimens and experimental taxonomy used in the majority of these studies explore the idea of using polymer concrete either as a construction material or as a material for building the body of machine tools. The experimental methodology and specimens used in this study to investigate the fatigue strength were chosen according to the machine-making material. In “rotational flexural fatigue” experiments conducted using high compressive strength composite materials, fatigue strength values were observed to be lower than previous studies.
ene kemiklerinin yeni tehlikesi: bisfosfonatlar
Selin Ergun,Pelin Guneri,Huseyin Koca
Cumhuriyet Dental Journal , 2011, DOI: 10.7126/cdj.2012.1151
Abstract: Bisphosphonate compounds have been used for the improvement of the lives of cancer patients by reducing complications such as hypercalcemia. They are preferred to treat bone metastases of solid tumors such as breast, prostate and lung cancer, and also utilized in the management of lytic lesions of multiple myeloma. Intravenous administration of high doses of bisphosphonates for the management of benign conditions occasionally lead to the development of osteonecrosis of the jaws. In many cases lesions appear spontaneously, or following an infection or a dental extraction. At present, there is no definite treatment for this particular druginduced necrosis of bone except conservative debridement of bone lesions, oral antibiotics and local irrigations. It is important to recognize the clinical and radiographic features of the bisphosohonate osteonecrosis of the jaws in order to provide early diagnosis and to improve the care of these patients. ZET Bisfosfonat bile ikleri malignansiye ba l olarak geli en hiperkalseminin düzenlenmesinde ve ayr ca, meme, prostat ve akci er kanserlerine ba l tüm rlerin ve multipl myelomaya ba l metastatik lezyonlar n tedavisinde kanser hastalar n n hayat kalitelerini iyile tirmek amac yla kullan lmaktad r. Bisfosfonatlar n yüksek dozlarda intraven z olarak uygulanmalar nedeniyle ilaca ba l bir yan etki olarak enelerde osteonekroz geli ebilmektedir. Lezyonlar kendili inden olu abildi i gibi, bir enfeksiyon ve di ekimi genellikle olay h zland rmaktad r. laca ba l olarak geli en bu zgün kemik nekrozu i in henüz kesin bir tedavi bulunmamaktad r. Konservatif yakla m uygulanan vakalarda, kemi in a a km oldu u hastalar n büyük b lümünde oral antibiyotikler, antienflamatuvarlar ve a k yara b lgesinin lokal irrigasyonu nerilmektedir. Bisfosfonat osteonekrozuna ait klinik ve radyografik zelliklerin iyi bilinmesi ve bu tür hastalarda klinik ve radyolojik belirtilerin de erlendirilmesi, erken tan ve tedavi a s ndan da nem ta maktad r. Anahtar Kelimeler: Bisfosfonatlar, osteonekroz, metastaz, hiperkalsemi, ene
How to Select the Best Method For Database Applications, Database Independent Platform or Not?
Halil Ibrahim Bulbul,Yasar Guneri Sahin
Journal of Applied Sciences , 2007,
Abstract: Software developers generally want to create software that could run with many different DBMSs (database independent platform). But, this idea sometimes may not be implemented to real world applications. The key point is that, it is too hard to decide which method (dependent to specific DBMS or independent from DBMS) should be selected. Each method has particular advantages and disadvantages. Actually, the decision is depended on some restrictions that are related to money, human resources, duration of project, etc. In addition, one of the most important factors is the choice of CASE tool that will be used for the software project. This study addresses how a decision should be made as to which method will be convenient for a specific application. Furthermore, possible development scenarios, that may be used in the project has been presented and some coefficient factors were found which help the developers to see which method may be more appropriate for the application.
Page 1 /283
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.