| DIPED-2020 | Tbilisi, Georgia | 2020 | 15-18 სექტემბერი | TSU | Mobile Antenna Matching Study Considering Different Holding Positions at 2100 MHz Frequency | oral | The purpose of the present research is to study mobile phone Dipole antennas' matching to a free space with a variety of human hand (fingers) positions in case of different positions of the human head and the headset; Since the hand, holding the mobile phone, absorbs a big part of emitted energy during EMF exposure process and therefore, affects antenna matching conditions, it was great importance to estimate the SAR values in the human head, and to investigate the dependency between SAR and S 11 coefficient (antenna matching parameter). The EMF in near and far zones and reradiated power are also studied. Numerical simulation is conducted on realistic nonhomogeneous human head and hand models by the FDTD (Finite Difference Time Domain) Method at 2100 MHz standard frequency. | https://ieeexplore.ieee.org/abstract/document/9273363 |
| DIPED-2018 | Tbilisi, Georgia | 2018 | 24-27 სექტემბერი | TSU | Mobile Phone Antenna’s EM Exposure Study on a Homogeneous Human Model Inside the Car | oral | Mobile phones' radiation influence on a homogenous human model located inside a car is studied in this research. One of the novelty of proposed research is earth surface influence consideration under the car on EM field formation inside it. The inner field and its amplification by the car's walls that in some cases act like a resonator are studied. The problem was solved numerically using the Method of Auxiliary Sources. Numerical simulations were carried out at the 450, 900, 1800 [MHz] standard communication frequencies. Obtained results showed the presence of resonant phenomena inside the car. | https://ieeexplore.ieee.org/document/8543310 |
| 2017 IEEE First Ukraine Conference on Electrical and Computer Engineering (UKRCON) | Kyiv, Ukraine | 2017 | 29 მაისი -2 ივნისი | | EM Exposure Study on an Inhomogeneous Child Model Considering Hand Effec | oral | This paper presents the human EM exposure simulation study considering the presence of a hand, holding the handset. The inhomogeneous child model was used to simulate thermal response of head tissues exposed to RF energy at 900 MHz, 1900 MHz and 3700 MHz frequencies. The goal of proposed research is to study how the head and hand (fingers) positions (being in a near field of phone's antenna) can influence on the SAR pick values and temperature rise in the head tissues, caused by absorption of EM field energy. 1mm and 10mm distances have been studied from the handset to the child's head model. Numerical simulations are carried out using finite-difference time domain (FDTD) method. Obtained results are presented and analyzed below. | https://ieeexplore.ieee.org/document/8100484 |
| DIPED-2017 | Dnipro, Ukraine | 2017 | 25-28 სექტემბერი | | Base Station Antenna's EM Exposure Study on a Homogeneous Human Model Located Inside the Car | oral | The aim of this research is to investigate the influence of EM radiation, emitted by base station antenna, on a human homogenous model located in a car and study possible resonant fields inside it considering ground existence. The standard frequencies: 450, 900, 1800 [MHz] are selected for numerical experiments. The problems are studied using a user friendly program package base on the Method of Auxiliary Sources (MAS). The results of the numerical simulations are presented and analyzed below. | https://ieeexplore.ieee.org/document/8100603 |
| CEMA'17 | Sofia, Bulgaria | 2017 | 12-14 ოქტომბერი | | | oral | The goal of the proposed research is to investigate the influence of mobile phone’s EM Radiation on a human, when it is located inside the car and study possible resonant fields in car. We have investigated several cases when a human with a cellphone is located inside a car and also the case when the EM source is the base station antenna located outside, at 450 MHz, 900 MHz and 1800 MHz frequencies. The problems are solved using the Method of Auxiliary Sources (MAS). The numerical results showed the presence of resonance phenomena and high reactive field (standing waves) in several scenarios, that causes higher SAR in human tissues and could be dangerous for a human. | |
| 11-th International Conference on Communications, Electromagnetics and Medical Applications (CEMA’16) | Athens, Greece | 2016 | 13-15 ოქტომბერი | | Human Exposure Study for Some Scenarios | oral | In this article The main aim of the research is to investigate EM exposure influence on a human homogenous model located in a car and study possible resonant fields. This problem is very topical, because in some cases the excitation source is located in vicinity to the sensitive tissues. We have investigated several cases when a human with a cellphone is located inside a car and also the case when the EM source is the base station antenna. The problems are solved using the Method of Auxiliary Sources (MAS) with a user friendly program package, created for numerical experiments realization for these particular problems. The results of the numerical experiment are presented and analyzed. | |
| EMC EUROPE 2016 | Wroclaw, Poland, | 2016 | 5-9 სექტემბერი | | Human Exposure Study for Large Scale Scenarios | oral | This paper presents the human exposure simulation study considering the presence of a hand, holding the handset, and some resonant effects due to the presence of the room walls. The motivation for this research is the necessity to consider influence of the hand on the field in the near zone for proper understanding of the exposure nature. It is known that for some frequencies rooms in the ferroconcrete buildings are resonant for EM field. The standing waves may be created with field values several times higher than value of the incident field. One of the parameters to consider for resonant effects study is the variable wall transparency. We have investigated several cases when a human with a cell phone is located inside and outside of a room and also the case when the EM source is the base station antenna. The problem is solved using the Method of Auxiliary Sources with a user friendly program package, created for numerical experiments for this particular problem. Several cases of the human location and building wall's transparency parameters are considered during the calculations. The numerical experiment results are presented and analyzed. | https://ieeexplore.ieee.org/abstract/document/7739165 |
| DIPED-2016 | Tbilisi, Georgia | 2016 | 26-29 სექტემბერი | | EM Exposure Study on Inhomogeneous Human Model Considering Different Hand Positions | oral | The main aim and the novelty of the proposed research is to study Mobile phone EM exposure thermal influence for the inhomogeneous woman models in case of different hand (finger) positions, holding the mobile phone, at 900 MHz, 1900 MHz and 3700 MHz frequencies. The motivation of this work is the necessity to consider influence of the hand, its position and position of the handset upon the near field for proper understanding of the exposure nature. Numerical simulations are carried out using finite-difference time domain (FDTD) method to estimate the specific absorption rate (SAR) and temperature rise caused by absorption of EM field energy in the human tissues. The obtained results are presented and analyzed below. | https://ieeexplore.ieee.org/document/7772197 |
| GlobeSPACE’2014 | Tel-Aviv, Israel | 2014 | 2-3 დეკემბერი | | Human EM Exposure Simulations for some big scenarios using MAS | oral | A mobile communication system base station's radiation interaction with a human model inside of a building is studied in this article. The inner field and its amplification by the building as a resonator are studied. The problem is solved using the Method of Auxiliary Sources with a program package, created for numerical experiments. Several cases of the human location and building wall's transparency parameters are considered and the numerical experiment results are presented. | |
| DIPED-2014 | Tbilisi, Georgia | 2014 | 22-25 სექტემბერი | | Base Station Antenna’s EM Field Distribution in the Room with a Human Model Inside | oral | A mobile communication system base station's radiation interaction with a human model inside of a building is studied in this article. The inner field and its amplification by the building as a resonator are studied. The problem is solved using the Method of Auxiliary Sources with a program package, created for numerical experiments. Several cases of the human location and building wall's transparency parameters are considered and the numerical experiment results are presented. | https://ieeexplore.ieee.org/document/6958306 |
| Elnano-2014 | Kyiv, Ukraine | 2014 | 15-18 აპრილი | | Human EM Exposure Study for Some Big Scenarios | oral | The motivation of this paper is to study the influence of the background EM field (at wireless connection frequencies) on the human body. We have investigated the EM field's distribution in the closed, semi-open and open geometries with the presence of the human model. We studied the EM wave field's nature for some big scenarios considering interaction with an object like a human body. Besides, we have an interest in dependence of the radiated pattern on the user's position, mobile position and window location for the studied geometry. We consider several cases with different positions of the EM source, and different transparency coefficients for the surfaces of the semi-closed geometries. A special attention in the paper is paid to the modeling methodology of surface transparency variations. An algorithm based on MAS method applied to the semi-open geometries is described in this paper. Because of resonance phenomena on some frequency and surface transparency the strength of the standing EM field becomes extremely high and this is the cause of the high SAR values. Results of calculations are presented in the paper mainly for different wireless connections frequencies. | https://ieeexplore.ieee.org/document/6873912 |
| DIPED-2013 | Lviv, Ukraine | 2013 | 23-26 სექტემბერი | | Human Exposure Simulation in Big Scenarios using MAS | oral | A solution approach to the diffraction problem for human body inside of a semi-open geometry is described in this paper. | https://ieeexplore.ieee.org/document/6653865 |
| BIOEM - 2013 | The saloniki, Greece. | 2013 | 10 – 14 ივნისი | | Blood Perfusion Model for the Pennes Bio-Heat Equation | poster | A novel numerical model to simulate thermal response of human body tissues exposed to RF energy is presented in this paper. It is based on the new algorithm for construction of realistic blood vessel network, new model of blood flow velocity distribution and an approach to solve bio-heat equation in tissue with variable and initially unknown blood temperature distribution. The obtained results show relative difference between new and conventional models. The future plans involve the blood perfusion study for the whole body exposure. | |
| DIPED-2012 | Tbilisi, Georgia | 2012 | 24-27 სექტემბერი | | Study of Antenna matching Influence on the Results of RF Exposure Simulations | oral | The goal of this paper is to explain some inconsistent results obtained during EM exposure numerical simulations and measurements of temperature rise and SAR. After completing the research in terms of MMF II project [1, 2] it became obvious that the understanding of this problem is not complete, and we have to consider some additional aspects. One of them is the presence of a hand, which is discussed in literature [2]. The other parameter is the antenna matching. | https://ieeexplore.ieee.org/document/6344104 |
| DIPED-2008 | Tbilisi, Georgia | 2008 | 22-25 სექტემბერი | | Numerical simulation of heat transfer in human tissue according to improved vascular structure model | oral | A new algorithm for construction of artificial blood vessel networks and a new approach to simulate heat exchange in tissue are presented. The algorithm produces discrete three-dimensional geometric representations of both arterial and venous networks. The key feature of the algorithm is that growth begins from the root points and it can work with any enclosed geometry. The main difference of proposed method is that blood perfusion occurs mainly in capillary. Two different methods of constructing blood velocity vector field in tissue accounting capillary blood flow are presented. It is needed for precise thermal analysis using the modified bio-heat equation to provide better prediction of thermal response of tissues exposed to RF energy. | https://ieeexplore.ieee.org/document/4671826 |
