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Search Results: 1 - 10 of 177771 matches for " Tar?k Y?lmaz "
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Smart Card Approach for Secure Data Communication
Tark Ylmaz
Sel?uk Journal of Applied Mathematics , 2011,
Abstract: With the introduction of internet technology, e-trade, voice and video transfer and social networks are increasingly becoming widespread. Thanks to these technologies, people can do their jobs in a virtual environment non-spatially and rapidly. However, the security of the data people share using these technologies is serious concern. In this study, a method to provide security of the data shared on the internet is proposed. This method is developed by integrating smart card technology and encryption techniques. In the application section, method and the software developed to operate the method are defined in details.
Bilsay Akal?n,Zeki Ylmaz,Tark Art??
Erciyes Medical Journal , 2012,
Abstract: Objective: The aim of this study was to investigate the effect of Met–RANTES on the viability of hepatocytes in an experimental controlled non-heart beating donor models in rats, and also to determine the usefulness of these grafts. Material and Method: Thirty Wistar-Albino rats weighing between 225 and 290 g were used in this study, and were divided into two groups (study and control) of 10 rats each. Cardiac arrest was performed by intracardiac KCl injection (0.2 mL). The interval between the cessation of cardiac activity and organ retrieval was 30 minutes. Before the cessation of cardiac activity, 0.1 mL heparin was administered subcutaneously to each rat. 0.05 mL saline was given to the control group and 1 g/kg Met-RANTES was given to the study group 2 hours before cardiac arrest. Subsequently, a suitable catheter (3.5 French) was inserted into the portal vein. Liver grafts were washed out with 50 mL Euro Collins solution via the portal vein catheter. Liver grafts, which were dissected totally, were reperfused for 60 minutes with HTK solution using a circulator system. AST and ALT levels were measured in the perfusion fluid. Results: AST and ALT levels were significantly lower in the Met-RANTES group (P<0.05).Conclusion: Met-RANTES increases the biochemical viability of hepatocytes in an experimental non-heart beating donor model in rats.
Clinical and Laboratory Evaluation of Anti-Microbial Efficacy of Photocatalysts
Berkant ?zpolat,Tark ?avu?o?lu,Seyhan Ylmaz,ünase Büyükko?ak
Journal of Clinical and Analytical Medicine , 2011, DOI: 10.4328
Abstract: Aim: This study aims at investigating and testing the tentative antimicrobial efficacy; in vitro and in- hospital applications of apatite coated ferrum titanate which is one of the new generation photocatalysts. Material and Methods: 30 sterile petri dishes were kept under florescent light for 4 days following the application of 20 ppm apatite coated ferrum titanate aerosol. 0.5 McFarland (1.5X108 CFU/mL -CFU=colony forming unit) Pseudomonas aeruginosa and 0.5 McFarland Acinetobacter baumannii were cultured on 10 separate dishes. 10 unprocessed dishes were used as controls. Samples were evaluated for bacterial survival rate (CFUX100/CFU) after application. In the second step, same photocatalyst aerosol was applied as 0.012 L/m2 with the specific kit on the surfaces of different units within the hospital. Particle count was measured and compared before and one-month after the photocatalyst application by lumimeter. Results: Bacterial survival rate was significantly lower on photocatalyst applied surfaces versus control for Pseudomonas aeruginosa after second day of application (p<0.001) (60±8% / 95±9%). This difference continued up to the 4th day gradually (3. day: 35±5% / 90±9%; 4. day:22±5% / 85±8%). Bacterial survival rate was significantly lower on photocatalyst applied surfaces versus control for Acinetobacter baumannii after the second day of application (55±7% / 87±8%) (p<0.01). This difference continued up to the 4th day gradually (3. day:40±5% / 80±8%; 4. day:15±5% / 78±7%). Particle count on photocatalyst applied surfaces diminished 97.15% in operating room, 95.61% in ICU, 98.30 in physicians’ room, 94.13% in wards and 97.04% in hospital kitchen. Conclusions: As a result of our pioneering study on the evaluation of photocatalyst, we think that it may be one of the economic and safe alternative methods of hospital sterilization based on bactericidal and bacteriostatic efficacy confirmed in both laboratory and clinical applications.
The Effect of Edaravone on Liver Damage in Controlled Experimental Non-Heart-Beating Donor Model
Mehmet Mustafa ?etin,Zeki Ylmaz,Tark Art??,Kemal Deniz
Erciyes Medical Journal , 2012,
Abstract: Objective: The aim of this study is to investigate the effect of Edaravone on viability of hepatocytes in experimental controlled non-heart beating donor models of rats and additionaly to determine the usefullness of these grafts.Material and Methods: Forty Wistar-Albino male rats, 225-290 grams in weight were randomly assigned to five different groups (sham, two control and two study groups). Cardiac arrest was performed by intracardiac KCl injection (0.2 mL). Livers were subjected to 30 minutes of warm ischemia and were washed out with 50 mL Euro Collins solution via a portal vein catheter after total hepatectomy. Liver grafts in the control groups and the study groups were perfused with Histidin- Tryptophan- Ketoglutarat solution including SF and edaravone (1 mg/kg), respectively. The perfusion was lasted for 30 or 60 min using a circulatory system. AST, ALT, IL-10, IL-6, TNF-α levels were measured in the perfusion fluids. The grafts were saved under suitable conditions for histopathological assessment. Results: It was found that the Edaravone Groups have lower levels of AST, ALT, IL-6, and TNF-α and have higher levels of IL-10, PCNA labeling index, and Bcl-2 staining index when compared to Control Groups.Conclusion: Edaravone increases the viability of hepatocytes biochemically, morphologically in experimental controlled non-heart beating donor models of rats.
Industry Orientation, Exporting and Productivity  [PDF]
Ylmaz K?l??aslan, Levent Erdo?an
Modern Economy (ME) , 2012, DOI: 10.4236/me.2012.31012
Abstract: This paper aims to analyse the relation between exporting behaviour of the firms and productivity by testing for learning by exporting hypothesis in Turkish manufacturing industry. Moreover, this study examines whether exporting and productivity relations change with respect to the orientation of industry in which the firm operates. We use the data on the largest 1000 industrial enterprises of Turkey from 1997 to 2007. The results based on unbalanced dynamic panel data models estimated show that there is no evidence that exporting fosters productivity at the firm level in Turkish manufacturing industry. Disaggregation of industries with respect to their orientations does not change this result. Exporting, or increase in the exports of the firm, doesn’t seem to be one of the sources of productivity growth at least for the firms already exporting in Turkish manufacturing.
Derivative Spectrophotometric and Isocratic High Performance Liquid Chromatographic Methods for Simultaneous Determination of Repaglinide and Metformin Hydrochloride in Pharmaceutical Preparations  [PDF]
Serap Sa?l?k Aslan, Berna Ylmaz
American Journal of Analytical Chemistry (AJAC) , 2017, DOI: 10.4236/ajac.2017.89039
Abstract: In this study, a derivative spectrophotometric method and one HPLC method were developed and validated for analysis of anti-diabetic drugs, repaglinide (RPG) and metformine hydrochloride (MTF) in tablets. The spectrophotometric methods were based on zero-crossing first-derivative and fourth-derivative spectrophotometric method for simultaneous analysis of RPG (308 nm) and MTF (267 nm), respectively. Linear relationship between the absorbance at λmax and the drug concentration was found to be in the ranges of 5.0 - 50.0 μg·mL-1 for both RPG and MTF. The quantification limits for RPG and MTF were found to be 0.568 and 1.156 μg·mL-1, respectively. The detection limits were 0.170 and 0.347 μg·mL-1 for RPG and MTF, respectively. The second method is a rapid stability-indicating isocratic HPLC method developed for the determination of RPG and MTF. A linear response was observed within the concentration range of 5.0 - 50.0 μg·mL-1 for both RPG and MTF. The quantification limits for RPG and MTF were found to be 1.821 and 1.653 μg·mL-1, respectively. The detection limits were 0.601 and 0.545 μg·mL-1 for RPG and MTF, respectively. The proposed methods were successfully applied to the tablet analysis with good accuracy and precision.
Primary school teachers’ views about pupil control ideologies and classroom management styles
Kür?ad Ylmaz
Cypriot Journal of Educational Sciences , 2009,
Abstract: Classroom management is a critical competency area for all teachers because classroom management skills are directly relatedto pupil achievement. In the present study, the four-category (authoritarian, authoritative, laissez-faire, indifferent)classification of Kris (1997a) is used. Pupil control ideologies, conceptualized by Willover, Eidell and Hoy (1967), were developedto define teachers’ views about pupil control. Pupil control ideologies conceptualized as two poles ranging from custodialcontrol ideology to humanistic control ideology. The purpose of the present study is to determine the correlation betweenprimary school teachers’ views about pupil control ideologies and classroom management styles. The survey model studyattempts to answer the research questions. 200 primary school teachers from Kütahya province are included in the sample ofthe research. The data is collected using “Classroom Management Profile Scale” and the “Pupil Control Ideology Scale”.Descriptive statistics and Pearson correlation analysis were used in data analysis. According to the findings obtained from thestudy, primary school teachers mostly presented authoritarian classroom management style, which was respectively followedby authoritative classroom management style, laissez-faire classroom management style and indifferent classroommanagement style. The findings of the study show that primary school teachers are closer to custodial control ideology. Acustodial control ideology has certain qualities such as strict control, enforcement of orders, one way downwardcommunication, and distrust towards pupils, cruel punishments and taking undisciplined behavior as personal offences. There isa moderate, positive and significant correlation between the participants’ views about custodial control ideologies andauthoritarian classroom management styles. It could be said from the findings of the study that the more the custodial controlideology of the participants occurs, the more the authoritative classroom management styles are observed.
Buckling of Euler Columns with a Continuous Elastic Restraint via Homotopy Analysis Method
Aytekin Ery?lmaz,M. Tark Atay,Safa B. Co?kun,Musa Ba?bük
Journal of Applied Mathematics , 2013, DOI: 10.1155/2013/341063
Measuring Trust Component in Patient-Physician Relationship in Dermatology
Sad?k Ylmaz,Vahide Baysal Akkaya
Turkderm , 2009,
Abstract: Background and Design: Patient’s trust is an essential component of the patient-physician relationship. The aim of this study was to measure the level of trust of the patients in physicians, to determine factors affecting trust level and to propose some suggestions in order to improve trust component in patient-physician relationship. Material and Method: Three hundred five patients participated in the survey. A questionnaire was prepared to evaluate the level of patients’ trust in physician and satisfaction to the dermatology department and patients’ socio-demographic variables. Analyses of data obtained from questionnaires were performed using SPSS (Statistical Package of Social Science), version 15.0. Results: Patients have an average of 3.72±0.54 trust level (out of 5) in their physicians. This reveals the patients have a trust slightly above the medium level for their physicians. There are no statistically significant relationships between the trust level and other socio-demographic variables such as age, sex and income. Patients’ satisfaction level towards the dermatology department was 4.17±0.65. There was a positive and statistical significantly correlation between trust and satisfaction. Patients choose more cheerful and well-informed physicians. Trust had been determined as an important factor in the patient-physician relationship. Patients trust well-informed, sympathetic and honest physicians. Nevertheless, disrespectfulness and lack of information had been determined as the most distrusted physician behaviors.Conclusion: Although there are many studies to evaluate this subject in the literature as far as we determine this is the first study in dermatology practice in Turkey. Because there are many chronic diseases in dermatology to provide concordance of patients’ treatment and continuity to same physicians or medical clinics may be obtained by building the patient’s trust. In this sense, trust component in patient-physician relationship in dermatology must not be neglected. Also must be avoided for the distrusted attitudes and behaviors.
Problems and Proposals of Their Solutions in Dermatology Residency Training: A Survey of Residents’ Opinions in Turkey
Sad?k Ylmaz,Vahide Baysal Akkaya
Turkderm , 2009,
Abstract: Background and Design: There are many problems in dermatology residency training. The purpose of this study was to describe dermatology residents’ opinions about problems and proposals of their solutions of dermatology residency training programs in Turkey. In addition, by means of these estimations to propose efficient and standard curriculum components are aimed. Material and Method: A descriptive pilot study was designed and a questionnaire was prepared to describe the problems and suggestions for the solution in dermatology residency education. The survey was conducted between 20 June 2006 and 09 August 2006. The questions were prepared in accordance with a 1 to 5 Likert-type scale to evaluate the level of importance and sufficiency of the residents’ opinions. Results: Sixty seven (52 female, 15 male) residents responded to the survey. Based on the importance evaluation, although clinical-pathological meetings were the most important educational component, all other educational components were also indicated as important. Based on the sufficiency evaluation, the least sufficient educational components were photodermatology/laser therapy training (score, 1,82 of 5,0 ) and cosmetic dermatology (1,83). Sufficiency levels of educational components such as textbook review, translation and discussion (3,86) journal club (4,04), preparation of seminar (4,03) and allergy training (2,95) were evaluated as sufficient. All other educational components were determined as insufficient. Overall, the greatest discrepancies between the importance and sufficiency for all educational components were observed in cosmetic dermatology education (2,50).Conclusion: This is the first study to assess dermatology residency education based on the residents’ perspectives, in Turkey. These results show the necessity for review and revise of some of the elements and the necessity to prepare a standard curriculum of dermatology residency education. It is appropriate to concentrate on this item in the new program which will be prepared.
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