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Search Results: 1 - 10 of 376 matches for " Bulent Tugrul "
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A Complete CAD Model for Type-I Quantum Cascade Lasers with the use of Artificial Bee Colony Algorithm
Sevgi Yigit,Bulent Tugrul,Fatih Vehbi Celebi
Journal of Artificial Intelligence , 2012,
Abstract: In this study, a simple and a single complete CAD model is obtained for type I quantum cascade laser based on characteristic quantities (optical gain, refractive index change, linewidth enhancement factor). The model is based on Artificial Neural Networks (ANNs) which is optimized by a new algorithm called Artificial Bee Colony (ABC). The developed model is capable of making fast and reliable predictions which is very useful in the CAD design of related systems. The inputs of the model are injection current and wavelength, respectively. The model agrees very well with the experimental findings that are previously published.
Multiobjective Design Optimization of Grillage Systems according to LRFD-AISC
Tugrul Talaslioglu
Advances in Civil Engineering , 2011, DOI: 10.1155/2011/932871
Abstract: Both the entire weight and joint displacements of grid structures are minimized at the same time in this study. Four multiobjective optimization algorithms, NSGAII, SPEAII, PESAII, and AbYSS are employed to perform computational procedures related to optimization processes. The design constraints related to serviceability and ultimate strength of grid structure are implemented from Load and Resistance Factor Design-American Institute of Steel Constructions (LRFD-AISC Ver.13). Hence, while the computational performances of these four optimization algorithms are compared using different combinations of optimizer-related parameters, the various strengths of grid members are also evaluated. For this purpose, multiobjective optimization algorithms (MOAs) employed are applied to the design optimization of three application examples and achieved to generate various optimal designations using different combinations of optimizer-related parameters. According to assessment of these optimal designations considering various quality indicators, IGD, HV, and spread, AbYSSS shows a better performance comparatively to the other three proposed MOAs, NSGAII, SPEAII, and PESAII. 1. Introduction The grillage systems utilized in different structures like bridge or ship decks, building floors and space buildings, and so forth, contain traverse and longitudinal beams, which are made of available steel profiles with different cross-sections. The optimal selection of steel cross-sections from a discrete set of practically available steel profiles provides a big contribution to constructing cost of a grid structure. Therefore, either weight of grid structure or deflection of its joints is minimized according to certain design limitations prescribed by any code of practice, such as LRFD. During the design optimization of grillage systems, designer is frequently faced with a problem related to making a decision about determination of the most appropriate one between these two conflicting and commensurable objective functions. Although a displacement-related constraint is imposed as a (max span/300) according to the provisions of LRFD-AISC specification, the safety margin on displacement constraint is large when taking into account the grid structures with higher sensitivity against displacement, such as ship decks and floors of industrial buildings which bears special machines required an horizontally balanced position for a regular work. This task has been easily overcome in a way of introducing the concept of multiobjective optimization to the design applications of grid
A New Genetic Algorithm Methodology for Design Optimization of Truss Structures: Bipopulation-Based Genetic Algorithm with Enhanced Interval Search
Tugrul Talaslioglu
Modelling and Simulation in Engineering , 2009, DOI: 10.1155/2009/615162
Abstract: A new genetic algorithm (GA) methodology, Bipopulation-Based Genetic Algorithm with Enhanced Interval Search (BGAwEIS), is introduced and used to optimize the design of truss structures with various complexities. The results of BGAwEIS are compared with those obtained by the sequential genetic algorithm (SGA) utilizing a single population, a multipopulation-based genetic algorithm (MPGA) proposed for this study and other existing approaches presented in literature. This study has two goals: outlining BGAwEIS's fundamentals and evaluating the performances of BGAwEIS and MPGA. Consequently, it is demonstrated that MPGA shows a better performance than SGA taking advantage of multiple populations, but BGAwEIS explores promising solution regions more efficiently than MPGA by exploiting the feasible solutions. The performance of BGAwEIS is confirmed by better quality degree of its optimal designations compared to algorithms proposed here and described in literature.
The effects of IgM-enriched immunoglobulin preparations in patients with severe sepsis: another point of view – authors' response
Simru Tugrul
Critical Care , 2002, DOI: 10.1186/cc1846
Abstract: It was mentioned in the letter that the study protocol of Karatzas et al. regarding the design and inclusion criteria (except the age) was similar to our study design. It seems that there is another important difference between two studies, which is the subgroup analysis. Because of the limited number of patients included in our study, it was not intended to focus on the role of immunotherapy in reducing the mortality rate of severe sepsis patients. Mortality rate analyses in the subgroups of patients with different admission Acute Physiology and Chronic Health Evaluation II (APACHE II) scores were therefore not performed in our study.As Karatzas et al. noted, the APACHE II scores of our patients were lower than those found in their preliminary data analysis. This is an important difference indicating that the patient populations of their study and our study are far beyond similarity.Neurological evaluation in APACHE II scoring is based on the Glasgow coma scale (GCS) and is usually complicated by the frequent use of sedative agents in critically ill patients. It is often not clear whether to assume GCS in the absence of sedative drugs or to consider the actual GCS of the patient. Certainly this computation might be very confusing and prone to errors in data collection. In our clinical practice, we generally assume the mental state of the patients in the absence of sedative drugs while calculating the GCS. This might be the reason for relatively low levels of APACHE II scores in our study population. We agree with Karatzas et al. that the interpretation of data could be more relevant by homogenising the patients according to some clinical characteristics, especially in larger studies investigating the beneficial effects of immunotherapy in septic patients.Our study, which is the initial step of a new series of clinical investigations on this subject, was performed in a small group of patients with severe sepsis. We mentioned in our paper that recruiting this number
Diabetic Nephropathy
Armagan TUGRUL
Trakya Universitesi Tip Fakultesi Dergisi , 2002,
Abstract: Diabetic nephropathy is an important cause of end-stage renal disease. Its incidence is closely correlated with the duration of diabetes mellitus. Hyperglycemia, hypertension, smoking, advanced age, insulin resistance, male gender, high protein intake, and genetic factors have been implicated in the development of diabetic nephropathy. It has been shown that non-enzymatic protein glycation, enhanced polyol pathway, increased protein kinase C activity, glucose toxicity, biochemical defects in the extracellular matrix, and genetic factors play role in its pathogenesis. Treatment of diabetic nephropathy includes good blood glucose regulation with insulin, treatment of hypertension and microalbuminuria with ACE inhibitors, and decreased protein intake.
Diabetes Mellitus and Hypertension
Armagan TUGRUL
Trakya Universitesi Tip Fakultesi Dergisi , 2002,
Abstract: Hypertension is a major worldwide health problem. Its prevalence is 1.5-2 times higher in diabetic population than that in non-diabetic individuals. Its pathogenesis depends on diabetic nephropathy in type 1, whereas may be multifactorial in type 2 diabetes mellitus. In diabetics, angiotensin converting enzyme inhibitors are most widely preferred in the treatment of hypertension because of their numerous desirable effects. In this article, the most recent data are presented on the relationship between diabetes mellitus and hypertension, and on the epidemiology, pathogenesis, and treatments of hypertension in diabetic patients.
Meat Consumption and Buying Behaviors of Consumers Living in Manisa City Center, Turkey
Bulent Ergonul
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2011.286.290
Abstract: This study presents results of the data analysis and the results of a consumer questionnaire of 41 questions into meat and meat products carried out in Manisa city center among September 2008 and May 2009. Responds of 1200 consumers from different ages, genders and jobs were analyzed. Survey showed that despite recent food tendencies and new consumption behaviors, consumers living in Manisa still prefer red meat to poultry meat and fish. Also data related to consumption frequencies of meat kinds and meat products were conducted in the study.
Health Manpower Planning and Employment Policies for Turkey
Bulent Kilic
TAF Preventive Medicine Bulletin , 2007,
Abstract: Health manpower planning in health care should be done strategically while considering the following factors: health care needs and demands for community, health care organizations' objectives, goals and resources, goal of a high quality health workforce of sufficient size which has been appropriately distributed, their full employment realized within the appropriate time frame. A good health manpower planning consists of eight components: quantity (size), quality (skill), distribution, timing, employment, necessity, goals and resources. According to the calculations in this article, it must be 1515 people per general practitioner (GP) and 1333 people per midwife. There must be 44.755 GP and 50.866 midwife for primary level in Turkey. However there are 51.530 GP and 41.513 midwife in Turkey in 2002. In this situation there is no more need for GP but there is a big need for 10.000 midwife as totally and actually 30.000 midwife for working at health centres for Turkey. As a result, this article discusses the shortcomings of Health Ministry's employment policies in Turkey. It is suggested that in the short run concepts such as physician unemployment, under-employment and flexible work hours will become frequently discussed in Turkey health care public discourse. [TAF Prev Med Bull. 2007; 6(6): 501-514]
Could Microchimerism be an Etiological Factor in Psychotic Disorders? A Hypothetical Suggestion
Bulent Demirbek
Psikiyatride Guncel Yaklasimlar , 2010,
Abstract: In this letter to the editor, a possible etiologic relationship between microchimerism and psychotic disorders has been hypothezied and several study proposals that could be used in the testing of this hypothesis has been suggested.
The bad, the poor but alive
Bulent Mutlu
Anadolu Kardiyoloji Dergisi , 2008,
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