Amaç: Kalsiyum sülfat dihidrat (KSD) geçen yüzyıldan beri kemik defektlerinin tamirinde osteokonduktif özelliği nedeniyle başarı ile kullanılan bir biyomalzemedir. Osteokonduktif ajanların kırık kaynamasında da faydalı olabileceği bilinmektedir. Çalışmamızda, KSD’nin kırık iyileşmesi üzerine etkilerini araştırdık. Çalışma planı: Çalışmada 44 adet Wistar cinsi erkek sıçan (ort. ağırlık 255 gr; yaş aralığı 4-6 ay) kullanıldı. Deneye katılan sıçanlar rastgele iki eşit gruba ayrıldı. Kontrol grubunda, ...

Obstrüktif uyku apne sendromu tedavisinde cerrahi tedavi ile birlikte en sık kullanılan yöntem sürekli pozitif havayolu basıncı (Continuous Positive Airway Pressure: CPAP) ile yapılan tedavidir. CPAP cihazının tedavi seçeneği olarak hasta tarafından kabul edilmesi, gündüz aşırı uyku hali, hastalığın şiddeti, daha önce geçirilmiş cerrahi operasyon gibi birçok farklı nedene bağlıdır. Çalışmamızda, tedavinin kabulünü arttırmak açısından görsel ağırlıklı eğitimin etkileri 196 hasta üzerinde araştırıldı. ...

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 ...

After harvesting the conchal cartilage in a large series of secondary rhinoplasties using the anterior approach there was a marked improvement in the shape of the auricle with unnoticeable scarring hidden under the convolution of the antihelix. In this series of 250 cases there were no hypertrophic scars or keloid formations. Based on these favorable results a new modification of otoplasty was developed using only the anterior approach. Between 1992 and 2000 108 otoplasties were performed on 55 ...

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.

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 ...

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 ...

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.