Analysis of heat transfer and specific absorption rate of electromagnetic field in human body at 915 MHz and 2.45 GHz with 3D finite element method

2012 ◽  
Author(s):  
W. Suwansin ◽  
P. Phasukkit ◽  
C. Pintavirooj ◽  
A. Sanpanich
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Electromagnetic Field ◽  
Human Body ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
3D Finite Element ◽  
Specific Absorption ◽  
3D Finite Element Method

Auditory startle disrupts speech coordination

2021 ◽  
Vol 47 (2) ◽  
pp. 167-183
Author(s):  
Chenhao Chiu ◽  
Bryan Gick
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Human Body ◽  
Biomechanical Model ◽  
Induced Responses ◽  
3D Finite Element ◽  
Jaw Opening ◽  
Simulation Results ◽  
Temporal Interaction ◽  
3D Finite Element Method

Abstract Speech production requires temporal coordination between the actions of different functional groupings of muscles in the human body. Crucially, such functionally organized units, or “modules”, may be susceptible to disruption by an external stimulus such as a startling auditory stimulus (SAS; >120dB), enabling a possible window into the internal structure of learned speech movements. Following on the observation that SAS is known to accelerate the release of pre-planned actions, the current study examines lip kinematics in SAS-induced responses during speech movements to test whether this accelerated release applies on the scale of entire syllables or on the scale of smaller functional units. Production measures show that SAS-elicited bilabial movements in [ba] syllables are prone to disruption as measured by discontinuity in velocity profiles. We use a 3D finite element method (FEM) biomechanical model to simulate the temporal interaction between muscle groupings in speech. Simulation results indicate that this discontinuity can be accounted for as an instance of temporally decoupled coordination across neuromuscular modules. In such instances, the muscle groupings controlling lip compression and jaw opening, which normally fire sequentially, appear more likely to be activated synchronously.

Numerical Analysis of Specific Absorption Rate and Heat Transfer in the Human Body Exposed to Leakage Electromagnetic Field at 915 MHz and 2450 MHz

2011 ◽  
Vol 133 (5) ◽  
Author(s):  
Teerapot Wessapan ◽  
Siramate Srisawatdhisukul ◽  
Phadungsak Rattanadecho
Keyword(s):  
Electromagnetic Field ◽  
Temperature Distribution ◽  
Human Body ◽  
Power Distribution ◽  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Transfer Problem ◽  
Bioheat Transfer ◽  
Detailed Knowledge ◽  
Specific Absorption

In recent years, society has increased utilization of electromagnetic radiation in various applications. This radiation interacts with the human body and may lead to detrimental effects on human health. However, the resulting thermophysiologic response of the human body is not well understood. In order to gain insight into the phenomena occurring within the human body with temperature distribution induced by electromagnetic field, a detailed knowledge of absorbed power distribution is necessary. In this study, the effects of operating frequency and leakage power density on distributions of specific absorption rate and temperature profile within the human body are systematically investigated. This study focuses attention on organs in the human trunk. The specific absorption rate and the temperature distribution in various tissues, obtained by numerical solution of electromagnetic wave propagation coupled with unsteady bioheat transfer problem, are presented.

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