Human Head-Neck system: The effect of viscoelastic neck on the eigenfrequency spectrum

2000 ◽  
Vol 70 (5) ◽  
pp. 307-322 ◽  
Author(s):  
A. Charalambopoulos ◽  
D. I. Fotiadis ◽  
C. V. Massalas
Keyword(s):  
Human Head ◽  
Head Neck ◽  
Eigenfrequency Spectrum

scholarly journals Frequency spectrum of the human head–neck to mechanical vibrations

2017 ◽  
Vol 37 (3) ◽  
pp. 611-618 ◽  
Author(s):  
Bin Yang ◽  
Zheng Shi ◽  
Qun Wang ◽  
Feng Xiao ◽  
Tong-Tong Gu ◽  
...  
Keyword(s):  
Finite Element ◽  
Frequency Spectrum ◽  
Mechanical Vibration ◽  
Three Dimensional ◽  
Human Head ◽  
Element Model ◽  
Mode Shapes ◽  
Joint Disorder ◽  
Biomechanical Responses ◽  
Head Neck

This study is based on a real finite element human head–neck model and concentrates on its numerical vibration characteristic. Frequency spectrum and mode shapes of the finite element model of human head–neck under mechanical vibration have been calculated. These vibration characteristics are in good agreement with the previous studies. The simulated fundamental frequency of 35.25 Hz is fairly similar to the published documents, and rarely reported modal responses such as “mastication” and flipping of nasal lateral cartilages modes, however, are introduced by our three-dimensional modal analysis. These additional modes may be of interest to surgeons or clinicians who are specialized in temporomandibular or rhinoplasty joint disorder. Modal validation in terms of modal shapes proposes a necessity for elaborate modeling to identify each individual part’s extra frequencies. Furthermore, it also studies the influence of damping on resonant frequencies and biomechanical responses. It is discovered that damping has an inverse proportionality between damping effect on natural frequency and that on biomechanical responses.

Abstract 3672: Semaphorin 4D in human head & neck cancer: A promising predictive biomarker for the peri-tumoral stromal phenotype

2017 ◽  
Author(s):  
Rania H. Younis ◽  
Roshanak Derakhshandeh ◽  
Ahmed Sultan ◽  
Haiyan Chen ◽  
Kyu Lee Han ◽  
...  
Keyword(s):  
Neck Cancer ◽  
Human Head ◽  
Predictive Biomarker ◽  
Head Neck Cancer ◽  
Semaphorin 4D ◽  
Head Neck

Mechanisms controlling human head stabilization. I. Head-neck dynamics during random rotations in the horizontal plane

1995 ◽  
Vol 73 (6) ◽  
pp. 2293-2301 ◽  
Author(s):  
F. A. Keshner ◽  
B. W. Peterson
Keyword(s):  
Visual Feedback ◽  
Horizontal Plane ◽  
Mental Arithmetic ◽  
Human Head ◽  
The Body ◽  
Myoelectric Activity ◽  
Head Tracking ◽  
Arithmetic Task ◽  
Head Velocity ◽  
Head Neck

1. Potential mechanisms for controlling stabilization of the head and neck include voluntary movements, vestibular (VCR) and proprioceptive (CCR) neck reflexes, and system mechanics. In this study we have tested the hypothesis that the relative importance of those mechanisms in producing compensatory actions of the head-neck motor system depends on the frequency of an externally applied perturbation. Angular velocity of the head with respect to the trunk (neck) and myoelectric activity of three neck muscles were recorded in seven seated subjects during pseudorandom rotations of the trunk in the horizontal plane. Subjects were externally perturbed with a random sum-of-sines stimulus at frequencies ranging from 0.185 to 4.11 Hz. Four instructional sets were presented. Voluntary mechanisms were examined by having the subjects actively stabilize the head in the presence of visual feedback as the body was rotated (VS). Visual feedback was then removed, and the subjects attempted to stabilize the head in the dark as the body was rotated (NV). Reflex mechanisms were examined when subjects performed a mental arithmetic task during body rotations in the dark (MA). Finally, subjects performed a voluntary head tracking task while the body was kept stationary (VT). 2. Gains and phases of head velocity indicated good compensation to the stimulus in VS and NV at frequencies < 1 Hz. Gains dropped and phases advanced between 1 and 2 Hz, suggesting interference between neural and mechanical components. Above 3 Hz, the gains of head velocity increased steeply and exceeded unity, suggesting the emergence of mechanical resonance.(ABSTRACT TRUNCATED AT 250 WORDS)

Response of a Realistic Human Head-Neck Model to Impact

1978 ◽  
Vol 100 (1) ◽  
pp. 25-33 ◽  
Author(s):  
W. Goldsmith ◽  
J. L. Sackman ◽  
G. Ouligian ◽  
M. Kabo
Keyword(s):  
Human Head ◽  
Realistic Model ◽  
Impulsive Loading ◽  
Head Model ◽  
Steel Sphere ◽  
Pressure Transducers ◽  
Response Characteristics ◽  
System A ◽  
The Impact ◽  
Head Neck

A structurally realistic model of the human head-neck system, consisting of a water-filled human cadaver skull and an artificial neck was subjected to pendulum impact under nondestructive conditions. The neck consisted of a series of neoprene and aluminum rings fabricated so as to faithfully reproduce the head motion of living persons in the saggital plane. Both an aluminum spherical shell and a solid steel sphere were employed to produce contact durations of the order of 1–6 ms and 0.2–1 ms, respectively, depending upon whether the impact occurred against the bare skull or against one of several scalp simulators used. Both frontal and occipital blows were produced on the system. A series of pressure transducers were suspended along the impact axis that measured the history of this parameter for the various conditions employed, and a crystal transducer arrangement ascertained the force input to the system. A displacement gage was utilized to record the excursion of the head-neck junction. Significant differences in pressure response were noted between frontal and occipital blows without protective covers that disappeared when scalp simulators were employed. The response characteristics in the present tests were much simpler than in corresponding tests using an acrylic shell for the head model, where pressures under similar impulsive loading conditions were at least an order of magnitude larger; this difference is attributed to the layering effect of the real skull relative to the homogeneous shell previously used.

scholarly journals Identification of potential therapeutic targets in human head & neck squamous cell carcinoma

2009 ◽  
Vol 1 (1) ◽  
pp. 27 ◽  
Author(s):  
Jing Han ◽  
Mitomu Kioi ◽  
Wei-Sing Chu ◽  
Jan L Kasperbauer ◽  
Scott E Strome ◽  
...  
Keyword(s):  
Squamous Cell Carcinoma ◽  
Cell Carcinoma ◽  
Squamous Cell ◽  
Therapeutic Targets ◽  
Human Head ◽  
Neck Squamous Cell Carcinoma ◽  
Head Neck
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