Papers by Ibrahim B Basyigit
The effect of magnetic shielding effectiveness has been
investigated for apertures on metallic en... more The effect of magnetic shielding effectiveness has been
investigated for apertures on metallic enclosure and has been
calculated as a function of enclosure dimensions, aperture
dimensions position within the enclosure. The calculation
magnetic shielding depends upon the frequency and polarization
of the applied field, the dimensions of the enclosure and the
apertures, the number of apertures, and the position within the
enclosure. Analytical formulation confirms that long thin
apertures are worse than round or square apertures of the same
area. For a typical sized enclosure, the theory predicts that
doubling the length of a slot reduces magnetic shielding
effectiveness and by about 12 dB, while doubling the width only
reduces magnetic shielding effectiveness and by about 2 dB.
Calculations using the new formulation show that doubling the
number of apertures reduces magnetic shielding effectiveness
and by about 6 dB. However, dividing a long slot into two
shorter ones increases magnetic shielding effectiveness and by
about 6 dB.
Bu çalışmada Türkiye'de servis veren iki farklı mobil haberleşme operatörünün 2G ve 3G servis sağ... more Bu çalışmada Türkiye'de servis veren iki farklı mobil haberleşme operatörünün 2G ve 3G servis sağlayıcılarından yararlanılmıştır. Çalışmada Akdeniz Üniversitesi Tıp Fakültesi hastanesinde yer alan medikal cihazların cep telefonlarından kaynaklı, elektromanyetik girişim (EMG), etkilenme mesafeleri incelenmiştir. Hastane ortamında farklı ünitelerde 30 farklı cihaz üzerinde ölçümler gerçekleştirilmiş, cihazlardaki ses ve görüntü tepkisine bağlı gözle görülen bozulmalar mesafeyle ilişkili olarak tespit edilmiştir. Çalışmada özellikle ECG ve EEG cihazların elektromanyetik girişime maruz kaldıkları gözlenmiştir. Maruziyet mesafesi 1.25m ile başlamaktadır. Abstract In this study, two different mobile communication operators provide services in Turkey have been choosen that each operator has both 2G and 3G services. In this study, electromagnetic interefernce distance to medical equipments located in The Medical School Hospital of Akdeniz University sourced from mobiled phones have been examined. Through out different units in the hospital environment, 30 different measurements carried out, and deterioration in audio and visual signal reaction of devices was found to be associated with the distance to mobile phones. Electromagnetic interference, particularly of the ECG and ted EEG device was observed, and exposure begins with range 1.25m distance.
2010 15th National Biomedical Engineering Meeting, 2010
... Zeynep Akın Colak, Selcuk Helhel, İ. Bahadır Basyigit ve Şükrü ÖZEN ... Bu akımların sistem d... more ... Zeynep Akın Colak, Selcuk Helhel, İ. Bahadır Basyigit ve Şükrü ÖZEN ... Bu akımların sistem dışında kalma koşulu; kabloların şaseye girdiği noktalarda, dalga boyu ile kıyaslandığında, en büyük yarık uzunluğunun λ<20 den küçük olması halindir. ...
Microwave and Optical Technology Letters, 2011
There exists 3-dimensional (3D) electromagnetic field distribution (EMFD) in the air and its comp... more There exists 3-dimensional (3D) electromagnetic field distribution (EMFD) in the air and its components can be used for polarization discrimination (XPD) or equivalently diversity improvement. Measurements were carried out through shore roads and hillsides. The results show that the lowest XPD is obtained for hill side road area, and very high signal cross-correlation is achieved through shore road. Calculated values point out that 30dB extra relative gain can be obtained by using suitable 3dimensional antenna design at shore sides, while 4.6dB by hill-side roads.
2011 XXXth URSI General Assembly and Scientific Symposium, 2011
The influence of an aperture area (between 2λ 2 and 11λ 2 ) on the Shielding Effectiveness of met... more The influence of an aperture area (between 2λ 2 and 11λ 2 ) on the Shielding Effectiveness of metallic enclosures has been measured in an anechoic chamber, and wavelength dependent SE measurements are introduced. Measurement setup was established operating between 6GHz to 13GHz. While the width/ length ratio varies from 1 to 16, shielding effectiveness gets better by about 6.5dB
Pediatric Allergy and Immunology, 2007
The Prevalence And Risk Factors of Allergies in Turkey (PARFAIT) study was planned to evaluate pr... more The Prevalence And Risk Factors of Allergies in Turkey (PARFAIT) study was planned to evaluate prevalence and risk factors of asthma and allergic diseases and also to find out which geographical variables and/or climatic conditions play a role determining the prevalence of allergic diseases in Turkish school children. Study was planned as cross-sectional questionnaire-based. About 25,843 questionnaires from 14 centers were appropriate for analysis. Parental history of allergy, having an atopic sibling and other atopic disease in index case was significant risk factors for all allergic diseases. Breast feeding decreased the risk of current asthma (OR: 0.92, CI: 0.86-0.99) and wheezing (OR: 0.93, CI: 0.87-0.99) but not allergic rhinitis and eczema. Respiratory infection in the past was an important risk factor for the occurrence of allergic diseases especially for asthma which was increased 4.53-fold. Children exposed to household smoke were significantly at higher risk of asthma, wheezing, and allergic rhinitis (OR: 1.20, CI: 1.08-1.33; OR: 1.21, CI: 1.09-1.34; and OR: 1.32, CI: 1.21-1.43, respectively). All allergic diseases were increased in those children living in areas which have altitude of below 1000 m and mean yearly atmospheric pressure above 1000 mb. The study has suggested that household and country-specific environmental factors are associated with asthma, wheezing, allergic rhinitis, and eczema risk during childhood in Turkey.
Human & Experimental Toxicology, 2007
This experimental study investigated the protective effects of N-acetylcysteine (NAC) on peroxida... more This experimental study investigated the protective effects of N-acetylcysteine (NAC) on peroxidative changes in fetal lungs in the offspring of rats exposed to cigarette smoke. Thirty fetal rats used for analysis, were divided into three groups as follows: control group (n = 10), whose mothers were exposed to fresh air; group I (n =10), whose mothers were exposed to cigarette smoke; and group II (n =10), whose mothers were exposed to cigarette smoke and given 10 mg/kg per day NAC. In groups I and II, smoke exposure was started 4 weeks before the pregnancy, and continued to the 14th day of pregnancy, and in Group II, NAC was administered intraperitoneally for 14 days. The mothers and their fetuses were decapitated on the 14th day of pregnancy. Malondialdehyde (MDA) and glutathione (GSH) levels were determined in the lung tissues of fetuses to determine the oxidant-antioxidant balance. While tissue MDA levels in Group I were found significantly higher than the control group (129.7+/-65.4 versus 63.4 +/-15.4 nmol/100 mg protein, P <0.05), GSH levels were significantly lower (17.1+/-7.3 versus 45.4 + 8.1 nmol/mg protein, P <0.01). Furthermore, in Group II, MDA levels were significantly lower (56.9+/-20.6 versus 129.7+/-65.4 nmol/100 mg protein, P <0.05), and GSH levels were significantly higher (34.57+/-10.7 versus 17.1+/-7.3 nmol/mg protein, P <0.0001) when compared with Group I. No statistically significant difference was found in tissue MDA and GSH levels between Group II and the control group (P >0.05). These results suggest that smoke exposure during pregnancy causes oxidative damage in fetal lungs. This smoke-induced damage might be prevented by NAC.
European Respiratory Journal, 2009
The Prevalence and Risk Factors of Allergies in Turkey (PARFAIT) study was planned to evaluate th... more The Prevalence and Risk Factors of Allergies in Turkey (PARFAIT) study was planned to evaluate the prevalence of and risk factors for asthma and allergic diseases in Turkey.
An empirical indoor to outdoor propagation model has been improved based on empirical techniques.... more An empirical indoor to outdoor propagation model has been improved based on empirical techniques. Improved model includes building structures such as number of walls, position of windows and the affect of frequency. Proposed model is valid for GSM 900, GSM 1800 and CDMA 2100. Theory and measurements are in tracking each other at CDMA2100 and GSM frequencies by at most 6dB deviation. Generated model can easily be used for outdoor coverage predictions and interference capability based on indoor antennas, especially at CDMA.
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Papers by Ibrahim B Basyigit
investigated for apertures on metallic enclosure and has been
calculated as a function of enclosure dimensions, aperture
dimensions position within the enclosure. The calculation
magnetic shielding depends upon the frequency and polarization
of the applied field, the dimensions of the enclosure and the
apertures, the number of apertures, and the position within the
enclosure. Analytical formulation confirms that long thin
apertures are worse than round or square apertures of the same
area. For a typical sized enclosure, the theory predicts that
doubling the length of a slot reduces magnetic shielding
effectiveness and by about 12 dB, while doubling the width only
reduces magnetic shielding effectiveness and by about 2 dB.
Calculations using the new formulation show that doubling the
number of apertures reduces magnetic shielding effectiveness
and by about 6 dB. However, dividing a long slot into two
shorter ones increases magnetic shielding effectiveness and by
about 6 dB.
investigated for apertures on metallic enclosure and has been
calculated as a function of enclosure dimensions, aperture
dimensions position within the enclosure. The calculation
magnetic shielding depends upon the frequency and polarization
of the applied field, the dimensions of the enclosure and the
apertures, the number of apertures, and the position within the
enclosure. Analytical formulation confirms that long thin
apertures are worse than round or square apertures of the same
area. For a typical sized enclosure, the theory predicts that
doubling the length of a slot reduces magnetic shielding
effectiveness and by about 12 dB, while doubling the width only
reduces magnetic shielding effectiveness and by about 2 dB.
Calculations using the new formulation show that doubling the
number of apertures reduces magnetic shielding effectiveness
and by about 6 dB. However, dividing a long slot into two
shorter ones increases magnetic shielding effectiveness and by
about 6 dB.