Browsing Araştırma Çıktıları / Scopus by Issue Date
Now showing items 1-20 of 1565
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Effect of low-dose methyl prednisolone on serum cytokine levels following extracorporeal circulation
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Publisher and Date:(Arnold Hodder Headline Plc., 1999)The systemic inflammatory response to cardiopulmonary bypass (CPB) is associated with increased production of cytokines. This systemic inflammatory response characterized by the activation of interleukin-6 (IL-6) and interleukin-8 (IL-8) during and after CPB is well documented. A prospective randomized double-blind study was performed so as to understand the effects of low-dose methyl prednisolone sodium succinate (MPSS) on the circulating levels of serum cytokines and clinical outcome. Twenty ...
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VLSI implementation of GRBF (Gaussian Radial Basis Function) networks
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Publisher and Date:(IEEE, 2000)A GRBF network is designed for VLSI implementation. Building blocks of the network consist mainly of analog circuits: op-amp multiplier multiplying DAC (digital to analog converter) floating resistor summer and exponentiator. Parameters of the network (center width of the Gaussian function and output layer weights) are represented digitally for convenient interfacing. It is shown that individual GRBF units allow independent tuning of center width and amplitude. Several network structures are ...
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Going against the national cultural grain: a longitudinal case study of organizational culture change in Turkish higher education
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Publisher and Date:(Carfax Publishing, 2000)This paper presents results of a longitudinal case study inquiry into the measurement of organizational culture change through the implementation of total quality management (TQM) concepts in a higher education context. The inquiry deals with the relationship between national culture and the company corporate culture the consequences of manager style change for TQM implementation and how culture change can be measured adequately. The results are achieved by the utilization of external (quantitative) ...
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Use of octopus 2 stabilization system for off-pump coronary artery bypass grafting
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Publisher and Date:(Medimond Srl, 2000)The early results of 126 off pump CABG procedures performed through a median sternotomy incision (OPCAB) during a period of 18 months were evaluated. The mean age was 69+/-4.3 years. There were 80 male and 46 female patients. Emergency cases and reoperations were not included. A total of 268 anatomosis were performed with a mean number of 2.12 anastomosis Per patient. Conduits used were: LITA (100%) RITA (11.1%) GSV in (84%) and radial artery in (31%) of cases. In 72% of the cases off pump surgery ...
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A synthesis tool for the multiplierless realization of FIR-based multirate DSP systems
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Publisher and Date:(IEEE, 2000)In this study a synthesis tool using a novel multirate folding technique which handles each FIR filter in a multirate DSP system as a single node is developed. A new architecture is presented for the multiplierless realization of a fold of multirate FIR filters. This synthesizer fully exploits the redundancies (i.e. `idle' and `missing' cycles) and common terms in multirate systems without sacrificing from overall system quality to produce multiplierless multirate systems. It also enables the usage ...
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Off-pump coronary artery bypass grafting with use of the octopus 2 stabilization system
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Publisher and Date:(2000)Background: The treatment of coronary artery disease has evolved rapidly over the last two decades. The gold standard of surgical revascularization, the on-pump coronary artery bypass graft, has been challenged by the development of percutaneous transluminal coronary angioplasty. Our experience with the alternative of the off-pump ("beating heart") coronary artery bypass (OPCAB) technique during a period of 18 months suggests that OPCAB avoids the complications of cardiopulmonary bypass and offers ...
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The use of the 5-HT3-receptor antagonist ondansetron for the treatment of postcardiotomy delirium
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Publisher and Date:(W.B. Saunders Co Ltd, 2000)Objective:To evaluate the effect of the 5-HT3-receptor antagonist ondansetron in patients with postcardiotomy delirium. Design: Prospective study. Setting: University hospital. Participants: Thirty-five patients who had undergone coronary artery bypass graft surgery. Interventions: Thirty-five patients 23 men and 12 women who developed delirium in the intensive care unit after coronary artery bypass graft surgery were included. Mean patient age was 51.3 years (range 36 to 79 years). A mental status ...
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Acute gastrointestinal complications after open heart surgery
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Publisher and Date:(Asia Publishing Exchange Pte Ltd, 2000)Retrospective analysis revealed that 24 of 4401 adult patients (0.5%) developed severe gastrointestinal complications after open heart surgery during a 3-year period from January 1995. There were 4 women (17%) and 20 men (83%). Mean age was 61.7 ± 2.02 years. Gastrointestinal bleeding (33.3%) mesenteric ischemia (20.8%) pancreatitis (20.8%) hepatic dysfunction (16.7%) and cholecystitis (16.7%) were the most common complications. Mortality was 41.7% (10 patients). During the same period mortality ...
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Parameter quantization effects in Gaussian potential function neural networks
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Publisher and Date:(World Scientific and Engineering Academy and Society, 2001)In hardware implementations of Gaussian Potential Function Neural Networks (GPFNN) deviation from ideal network parameters is inevitable because of the techniques used for parameter storage and implementation of the functions electronically resulting in loss of accuracy. This loss in accuracy can be represented by quantization of the network parameters. In order to predict this effect theoretical approaches are proposed. One-input one-output GPFNN with one hidden layer have been trained as function ...
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The use of composite stentless valves with graft extension for the treatment of ascending aortic aneurysms
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Publisher and Date:(Elsevier Science Bv, 2001)
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Removal of UroLume endoprosthesis using holmium : YAG laser
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Publisher and Date:(Mary Ann Liebert Inc Publ, 2001)A potential complication of UroLume endoprosthesis is migration which may necessitate removal of the stent. Stent removal may be associated with complications such as urethral injury bleeding and external sphincter trauma. We report a patient in whom a holmium:yttrium-aluminium-garnet (Ho:YAG) laser was used to cut the UroLume endoprosthesis into fragments which led to easy and uneventful stent removal.
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Fault-tolerant training of neural networks in the presence of MOS transistor mismatches
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Publisher and Date:(IEEE-INST Electrical Electronics Engineers Inc, 2001)Analog techniques are desirable for hardware implementation of neural networks due to their numerous advantages such as small size low power and high speed. However these advantages are often offset by the difficulty in the training of analog neural network circuitry. In particular training of the circuitry by software based on hardware models is impaired by statistical variations in the integrated circuit production process resulting in performance degradation. In this paper a new paradigm of ...
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Electrical activity regulates AChR gene expression via JNK PKC zeta and Sp1 in skeletal chick muscle
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Publisher and Date:(Elsevier Science Bv, 2001)Electrical activity of myotubes represses nicotinic acetylcholine receptor (AChR) gene expression. This effect is mimicked by okadaic acid and blocked by tetrodotoxin (TTX) or staurosporine in cultured myocytes [Altiok et al. EMBO J. 16 (1997) 717-725]. In this study we investigated the mechanism of this repression. We show that addition of exogenous phospholipase D (PLD) and C inhibits AChR expression in a manner which parallels that of okadaic acid. Furthermore okadaic acid caused an increase ...
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Does off-pump coronary artery bypass surgery reduce mortality in high risk patients?
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Publisher and Date:(Forum Multimedia Publishing LLC., 2001)Background: The aim of this retrospective study was to compare outcome in two groups of patients who were classified according to their risk groups and underwent coronary revascularization with or without cardiopulmonary bypass. Material and Methods: Between January 1996 and July 2000 480 cases that underwent coronary artery bypass surgery (CABG) were included in a retrospective nonrandomized manner for study. Group I included 210 patients who were revascularized using off-pump techniques. Octopus ...
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A left pulmonary artery aneurysm secondary to pulmonary hypertension
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Publisher and Date:(2001)We report a case of pulmonary trunk aneurysm extending into the left pulmonary artery due to pulmonary hypertension secondary to mitral valve disease. The mitral valve was replaced with a bileaflet mechanical prosthesis. A Dacron graft interposed between main trunk and left pulmonary artery branch and right pulmonary branch attached to the graft in an end-to-side fashion. Early postoperative angiogram revealed a very successful treatment.
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The stability constants of the rare earth complexes with trimetaphosphoric acid
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Publisher and Date:(Soc Chimica Italiana, 2001)The stability constants of the complexes formed between the rare earth metal ions and the anion of trimetaphosphoric acid have been determined at a temperature of 20 degreesC and an ionic strength of mu =0.1 by the ion-exchange equilibrium method. The investigations indicate that stabilities of complexes increased from La to Lu.The highest and the lowest stability constant values (beta) were found to be 7.76 and 3.82 for Lu3+ and La3+ respectively.
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Long-standing seroma after ultrasound-assisted liposuction
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Publisher and Date:(Lippincott Williams & Wilkins, 2001)
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Interactions of polyacrylamide polymer with bentonite in aqueous systems
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Publisher and Date:(Elsevier Science Bv, 2001)The flow properties of natural Ca bentonite and Na bentonite-water systems were studied after adding an anionic polyacrylamide (PAM) polymer. The effect of the PAM has also been investigated at different quantities. The experimental results are discussed in terms of bentonite forms and concentration of PAM. Besides measurement of theological properties of Ca bentonite + PAM and Na bentonite + PAM systems have been examined in detail through XRD FT-IR and DTA analyses. (C) 2001 Elsevier Science ...
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Anterior instrumentation for adolescent idiopathic scoliosis
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Publisher and Date:(Springer Verlag, 2001)Thirty-two patients with adolescent idiopathic scoliosis underwent anterior fusion with rigid single rod (third generation instrumentation) and titanium mesh cages. The mean follow-up was 31 (24-45) months and the mean age was 14.9 years. There were 8 patients with King type I 10 with type II 6 with type III 4 with type IV and 4 with lumbar curves. Titanium mesh cages were used in all the lumbar procedures and at the cranial and caudal ends of the instrumented area in thoracic cases. All the ...
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Acute aortic valve regurgitation secondary to blunt chest trauma
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Publisher and Date:(Texas Heart Inst., 2001)Blunt injury to the cardiac valves leads to progressive acute ventricular failure which often requires urgent surgical management In this case report we describe an acute aortic valve rupture caused by air-bag inflation during an automobile accident. Laceration of an aortic valve cusp was treated successfully with urgent aortic valve replacement. A concomitant orthopedic injury was treated electively 15 days after cardiac surgery. Acute aortic valve rupture is a very rare complication of blunt ...