Mikrodalga Işımalı İnsan Gözünün Ağırlıklı Genişletilmiş B-Spline Eğri Modeli

Bu makalede, insan gözünün mikrodalga ışınlaması sırasında kornea yüzeyindeki sıcaklık artışını hesaplamak için yeni geliştirilmiş olan ağırlıklı genişletilmiş b-spline eğrisi sonlu elemanlar yöntemi bilgisayar modellemesi kullanılmıştır. Mikrodalga ışınımlı gözün ısı iletim modeli geliştirilmiştir. Gözden ısı aktarımın mekanizması ve gözün ısıl parametrelerinin seçimi de ayrıca tartışılmıştır. Bu parametrelerin, ısı iletiminin ağırlıklı genişletilmiş b-spline çözümüne gerçekleştirimi oluşturulmuştur. Bunlara ek olarak, sıcaklık artış hesaplamaları, literatürde farklı yöntemlerle mikrodalgaya maruz kalan gözdeki ısı dağılımlarını inceleyen çalışmalarla karşılaştırılmıştır.

Weighted Extended B-Spline Model of Microwave Irradiated Human Eye

In this paper, newly developed finite element method with weighted extended b-spline computer modeling have been applied to calculate the corneal surface temperature rise of the human eye during microwave irradiation. The heat conduction model of the microwave-irradiated eye is constructed. The mechanism of heat transfer from the eye and the selection of the thermal parameters of the media of the eye are also discussed. The implementation of these parameters in the weighted extended b-spline solution of the heat conduction is then developed. Furthermore, temperature rises calculations are compared with the studies in the literature examining the distribution of heat in the eye which were exposed to microwaves in different ways.

___

  • AI-Badwaihy, K.A. ve Youssef, A.B. (1976). Biological effects of electromagnetic waves. C. C.Johnson ve M. L. Shore HEW Yayını (1), s. 61-78.
  • Taflove, A. ve Brodwin, M. (1975). Computation of the electromagnetic fields and induced temperatures within a model of the microwave-irradiated human eye. IEEE Trans. Microw. Theory Tech. MTT-23, 11, s. 888-896.
  • Emery, A.F., Kramar, P., Guy, A.W. ve Lin, J.C. (1975). Microwave 466 induced temperature rises in rabbit eyes in cataract research. Int. J. Heat Transfer, 97, s. 123-128.
  • Gandhi, O.P. ve Rzai, A. (1986). Absorption of millimeter waves by human beings and its biological implications. IEEE Trans. Microw. Theory Tech., MTT-34, s. 228-235.
  • Foster K.R., Nozano-Lieto, L. ve Riu, P.J. (1998). Heating of tissues by microwave: A model analysis. Bioelectromagnetics, 19, s. 420-428.
  • Sukru, O., Comlekci, S., Cerezci, O. ve Polat, O. (2002). Electrical properties of human eye and temperature increase calculation at the cornea surface for RF exposure. Biological Effects of EMFs 2nd Int. Workshop Proc., 2, Rodos, Yunan, 7-11 Ekim.
  • Sukru, O. (2003). Mikrodalga frekansli EM radyasyona maruz kalan biyolojik dokularda oluşan ısıl etkinin teorik ve deneysel incelenmesi. Doktora Tezi, Sakarya Üniversitesi, Fen Bilimleri Enstitüsü.
  • Wang J. ve Fujiwara, O. (1999). FDTD computation of temperature rise in the human head for portable telephones. IEEE Trans. Microw. Theory Tech., 47, s. 1528-1534.
  • Flyckt, V.M.M., Raaymakers, B.W., Kroeze, H. ve Lagendijk, J.J.W. (2007). Calculation of SAR and temperature rise in a high-resolution vascularized model of the human eye and orbit when exposed to a dipole antenna at 900, 1500 and 1800 MHz. Physics in Medicine and Biology, 52, s. 2691-2701.
  • Bernardi, P., Cavagnaro, M. ve Pisa, S. (1996). Evaluation of the power absorbed in human eyes exposed to milimeter waves. Int. Symp. Electromagn. Compat., Roma, İtalya, s.194-199.
  • Bernardi, P., Cavagnaro, M., Pisa, S. ve Piuzzi, E. (1998). SAR distribution and temperature increase in an anatomical model of the human eye exposed to the field radiated by the user antenna in a wireless LAN. IEEE Trans. Microw. Theory Tech., 46, s. 2074-2082.
  • Hirata, A., Matsuyama, S. ve Shiozawa, T. (2000). Temperature rises in the human eye exposed to EM waves in the frequency range 0.6-6 GHz. IEEE Trans. Electromagn. Compat., 42(4), s. 386-393.
  • Hirata A. ve Shiozawa, T. (2003). Heat transportation models of the human eye for microwave exposures. Proc. Int. Workshop Ocular Side-Effects by Non- Ionizing Radiation, Isikawa, Japonya.
  • Hirata A. (2005). Temperature increase in human eyes due to near-field and far field exposures at 900MHz, 1.5GHz and 1.9GHz. IEEE Trans. Electromagn. Compat., 47, s. 6876.
  • Hirata, A. (2007). Improved heat transfer modeling of the eye for electromagnetic wave exposures. IEEE Trans. Biomed. Eng., 54, s. 959-961.
  • De Boor, C. (1972). On calculating with b-splines. J. Approx. Theory, 6, s. 50-62.
  • Hollig, K. (2003). Finite element methods with b-splines, Frontiers in Applied Mathematics, 26, Society for Industrial and Applied Mathematics (SIAM), Philadelphia.
  • Kunter, F.C. ve Seker, S. (2011). Radially symmetric weighted extended b-spline model. Appl. Math. Comput., 217, s. 10305-10316.
  • Kunter, F.C. ve Seker, S. (2011). Using bioheat equation 3D web-spline prediction of ocular surface temperature. The 29th Progress in Electromagn. Res. Symp., PIERS 2011, Marakeş, Fas, 20-23 Mart.
  • Kunter F.C. ve Seker, S. (2011). 3D web-splines solution to human eye heat distribution using bioheat equation. Eng. Anal. Boundary Elements, 35, s. 639-646.
  • Seker, S. ve Abatay, H. (2006). New frequency-dependent parametric modeling of dielectric materials. Int. J. Electronic and Comm. (AEU), 60, s. 320-327.