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Search Results: 1 - 10 of 570208 matches for " Yavuz Selim Y?ld?r?m "
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Comparison of Pediatric and Adult Tonsillectomies Performed by Thermal Welding System
Tolga Ers?zlü,Yavuz Selim Yldrm,Selman Sarica
International Journal of Otolaryngology , 2013, DOI: 10.1155/2013/265105
Abstract: Objective. To compare pediatric and adult age groups in terms of postoperative bleeding and pain following tonsillectomy performed by thermal welding system (TWS). Method. The study consisted of 213 patients, of whom 178 were children and 35 were adults. The mean age of the pediatric patients (81 girls and 97 females) was years (range 3–13 years) and the mean age of the adults (20 males and 15 females) was years (range 15–41 years). All of the patients were evaluated in terms of postoperative bleeding and pain following tonsillectomy performed by TWS. Results. Bleeding was detected in the late postoperative period in 11 pediatric and 7 adult patients and of them 2 pediatric and 3 adult patients controlled under general. Postoperative bleeding was significantly less prevalent in the pediatric age group compared to the adult age group ( ). Likewise, postoperative pain was significantly less prevalent in the pediatric age group as compared to the adult age group ( ). Conclusion. Both postoperative bleeding and pain following tonsillectomy performed by TWS were more prevalent in the adult age group compared to the pediatric age group. 1. Introduction Tonsillectomy is the most common surgical procedure performed in the ear, nose, and throat practice. It is most frequently performed via cold dissection both in the pediatric and adult age group worldwide. Many hot dissection methods have been defined as an alternative to the cold dissection. Hot dissection methods include bipolar and/or monopolar electrocautery, radiofrequency, harmonic scalpel, coblator, and thermal welding system (TWS) [1]. Previous studies have reported and compared the outcomes of radiofrequency, TWS, cold knife, or monopolar electrocautery in terms of posttonsillectomy bleeding and pain [2]. Thermal welding is the technique that simultaneously uses heat and pressure to provide coagulation. In a study conducted on adults, tonsillectomies performed by TWS and bipolar electrocautery were compared in terms of intraoperative bleeding, operation duration, postoperative pain, time to regain normal diet, and postoperative bleeding [3, 4]. Multiparametric studies comparing a few methods have been conducted also in the pediatric age group [5]. However, studies comparing adult and pediatric patients in terms of postoperative bleeding and pain following tonsillectomy performed by TWS are limited. The aim of the present study was to investigate and compare the postoperative bleeding and pain following tonsillectomy performed by TWS in the pediatric and adult patients. 2. Materials and Method The
Does Left Ventricular Function on Echocardiography at Rest and Exercise Predict Recoarctation in Children with Postoperative Coarctation of Aorta ?
Naci ?ner,Kemal Ni?li,Taner Yavuz,Ay?e Yldrm
Ko?uyolu Kalp Dergisi , 2011,
Abstract: Objective: The aim of this study was to evaluate ventricular performance before and after exercise in children who had surgically repaired coarctation of aorta (CoA) by using two dimensional, M- mode and Doppler echocardiography and to determine whether this method can be used for identifying recoarctation in comparison to Magnetic Resonance Imaging (MRI). Design: We studied on 24 patients who were operated for CoA previously and compared with 24 healthy controls. Blood pressure monitoring, echocardiographies at rest and after exercise and MRI of aortic arc were performed. Patients having had ≥ 30 % of isthmic stenosis on MRI was diagnosed as recoarctation. The patient group were divided as Group A (patient without recoarctation) and Group B (patients with recoarctation) and were compared. Results: We found that 8 of 24 patients had recoarctation on MRI. Physical examination and echocardiographic evaluation revealed that hypertension on the right arm at rest, systolic and diastolic hypotension on the left leg after exercise, increased values of ejection fraction, fractioned shortening and aortic gradient on exercise may predict more than 30 % narrowing of the aortic isthmus. Conclusion: These findings can be useful as predictors for recoarctation.
Prenatal Diagnosis of Complete Atrioventricular Septal Defect: Perinatal and Neonatal Outcomes
Gokhan Y ld r m,Kemal Gungorduk,Fehmi Yaz c o lu,Ahmet Gul,Fatma akar, zgü elikkol,Yavuz Ceylan
Obstetrics and Gynecology International , 2009, DOI: 10.1155/2009/958496
Abstract: Objective. The purpose of this study was to establish the outlook for fetuses diagnosed with complete atrioventricular septal defect (cAVSD) prenatally and its relation to additional cardiac, extracardiac, and chromosomal abnormalities. Methods. We retrospectively reviewed fetal echocardiograms diagnosed with cAVSD from January 2002 to December 2007, comparing fetuses with and without aneuploidy. Results. Complete antrioventricular septal defect was confirmed in 62 fetuses. Mean maternal age was 28.79±4.78 years (range 20–38). Mean gestational age was 23.69±5.48 weeks (range 12–38). Fetal karyotype was known in all fetuses. An abnormal karyotype was found in 21 fetuses. Complete AVSD occurred without any other intracardiac abnormality in 28 fetuses. Extracardiac anomalies were present in 38 fetuses. As for pregnancy outcomes, there were 36 (58%) terminations of pregnancy and 4 (6.4%) intrauterine fetal deaths. In these four fetuses, complex cAVSD was associated with atrioventricular block (one case), heterotaxy (one case), and fetal hydrops (two cases). Of the 22 live births, 5 were neonatal deaths without surgery while 17 babies underwent surgery and 13 have survived to date. The mean survival age was 53±4 months (range 22–64 m). Conclusion. AVSD is associated with chromosomal, other cardiac, and extracardiac abnormalities. The detection of these abnormalities is important in order to give the best indication of the likely outcome when counselling parents.
The division and bending of green and red semiconductor laser light at the same time  [PDF]
Remzi Yldrm
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.310114
Abstract: In this experimental study, the laser light was split and bended using a specially designed glass lenses at the same time. This process has been done at the atmospheric pressure and room temperature conditions. During the experiments, the semiconductor laser as a source of green and red laser diode is used. In addition, polari- zation, magnetic field, electric field or any other auxiliary materials and systems which affect laser light are not used to bend the laser light. Only transparent glass lenses that are designed specially are used in the experimental study.
Benefaction from Carbonation of Flue Gas CO2 as Coal Mining Filling  [PDF]
Yldrm ?. Tosun
Geomaterials (GM) , 2014, DOI: 10.4236/gm.2014.42007
Abstract: CO2 capturing, transport and sequestration by pressurized water dissolution and reacting by natural alkali lime and magnesia in coal fly ash or other sources become an industrial advantageous sequestration option resulting in green waste solutions or solid fines. Mg and Ca containing minerals are reacting with CO2 to form carbonates. Various types of fly ash materials may react with CO2 to form carbonate regarding ash composition and reaction parameters. Mineral sequestration of CO2 will also allow using the products in cement industry or as cement material in constructions with low cost. This paper discussed progress on coal mining filling by carbonation method using coal fly ash of Soma, Yatagan, Afsin Elbistan Power Stations. Other filler materials containing coal mine waste shale, fly ashes and foam concrete, and additives were searched for pretreatment methods to enhance cement reactivity; and in analyzing the structural changes to identify reaction paths and potential barriers.
Shale Stone and Fly Ash Landfill Use in Landslide Hazardous Area in Sirnak City with Foam Concrete  [PDF]
Yldrm ?. Tosun
Geomaterials (GM) , 2014, DOI: 10.4236/gm.2014.44014
Abstract: Sirnak City and the surrounding areas are on steeper slopes. There are sliding large land masses or rocks. Underground water and harsh climatic conditions contain high risk hazard areas in urban living site with higher population density. In order to eliminate landslides and related events, significant precautions should be taken. The mapping of landslide risk may ease to take precautions. Even the application of landfill rock may reduce water content of soil. In this research, fly ash and Mine Waste shale stone were used with low density foam concrete. Waste mixture at certain proportions decreased cement use. Shale stone as fine aggregate instead of fly ash in specific proportions improved mechanical strength and porosity. Hence landslide hazardous area could be safer for urban living.
Wind Turbine Tower Optimization under Various Requirements by Using Genetic Algorithm  [PDF]
Serdar Yldrm, ?brahim ?zkol
Engineering (ENG) , 2010, DOI: 10.4236/eng.2010.28082
Abstract: The purpose of this study is to optimize the mass of 1.5 MW wind turbine steel tower performing Genetic Algorithm method (GA). In accordance with ASCE 7-98, AISC-89 and IEC61400-1 , the impact of loads on tower is calculated within the highest safety conditions against buckling strength of each sections of tower by means of GA codes. The stifness along tower is ensured entirely while the mass of tower is mitigated and optimized.
Emulsion Polymerization of Vinyl Acetate in the Presence of a New Cationic Surfactant  [PDF]
Ayfer Sarac, Bahire Filiz Senkal, Murat Yldrm
American Journal of Analytical Chemistry (AJAC) , 2014, DOI: 10.4236/ajac.2014.51003

In this study, the emulsion homopolymerization system containing vinyl acetate, potassium persulfate, a new cationic polymeric surfactant and water was studied by the applying semi-continuous emulsion polymerization process. The effects of new polymeric emulsifier on the physicochemical properties of obtained vinyl acetate latexes were investigated depending on vinyl acetate percentage in the polymerization recipe, and two thermal initiators in homopolymerization.

Eccrine Angiomatous Hamartoma: Case Report
Yldrm M.
Konuralp Tip Dergisi , 2009,
Abstract: Eccrine angiomatous hamartoma (EAH) is cutaneous lesion like benign tumor in which characterized with combined ecrine and vascular malformation and it was also known as a rare condition in adults. Herein presented case was also found in adult group and it was reviewed according to histomorphological and clinical findings.
Applying He's Variational Iteration Method for Solving Differential-Difference Equation
Ahmet Y ld r m
Mathematical Problems in Engineering , 2008, DOI: 10.1155/2008/869614
Abstract: We extend He's variational iteration method (VIM) to find the approximate solutions for nonlinear differential-difference equation. Simple but typical examples are applied to illustrate the validity and great potential of the generalized variational iteration method in solving nonlinear differential-difference equation. The results reveal that the method is very effective and simple. We find the extended method for nonlinear differential-difference equation is of good accuracy.
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