Advancements of Methods for Fast and Accurate Estimation of Human Body Segment Parameter Values

2017 ◽  
Author(s):  
Pelin Cizgin ◽  
Philipp Kornfeind ◽  
Michaela Haßmann ◽  
Arnold Baca
Keyword(s):  
Human Body ◽  
Accurate Estimation ◽  
Body Segment ◽  
Parameter Values

The Development, Application, and Limitations of 3D Human Simulations in Fall Accidents

2005 ◽  
Vol 49 (9) ◽  
pp. 858-861 ◽  
Author(s):  
Gary David Sloan
Keyword(s):  
Coefficient Of Friction ◽  
Human Body ◽  
Body Segment ◽  
Body Segments ◽  
Velocity Coefficient ◽  
Patterns Of Injury ◽  
Accident Site ◽  
Development Application ◽  
Fall Accidents

A tool that predicts the trajectories of linked human body segments on the basis of their inertial properties could be useful in the analysis of fall accidents. In order to be of value in forensic applications, relevant attributes of both the plaintiff and accident site must be modeled at some requisite level of fidelity. By systematically varying different attributes of the model, e.g., avatar posture, body segment velocity, coefficient-of-friction between modeled treads and footwear, it is possible to examine the likely consequences on body-segment trajectories. Trajectories and collisions can then be compared with patterns of injury, plaintiff testimony, and witness accounts.

Computer Program to Generate Dimensional and Inertial Properties of the Human Body

1975 ◽  
Vol 97 (1) ◽  
pp. 49-57 ◽  
Author(s):  
J. A. Bartz ◽  
C. R. Gianotti
Keyword(s):  
Computer Program ◽  
Human Body ◽  
Contact Surface ◽  
Digital Computer ◽  
Body Segment ◽  
Anthropometric Data ◽  
Data Set ◽  
Moments Of Inertia ◽  
Standing Height ◽  
Program Library

A digital computer program has been developed to calculate dimensional and inertial properties of the human body. The program has been designed so that the user may either select a data set from a program library, or compute a data set from a geometric man-model. From primary program inputs of sex, standing height, seated height, and weight, the routines compute body segment link lengths, contact surface dimensions, masses, and moments of inertia from inputted sets of anthropometric data. Overall validity of the formulation and techniques has been established by comparing computed results with measurements on the human body reported by various investigators.

scholarly journals Estimation of Photovoltaic Cells Parameters Using Chaos Embedded Salp Swarm Algorithm

2020 ◽  
Vol 13 (6) ◽  
pp. 110-119
Author(s):  
Dallel Nasri ◽  
◽  
Diab Mokeddem ◽  
Bachir Bourouba ◽  
◽  
...  
Keyword(s):  
Solar Cells ◽  
High Performance ◽  
Photovoltaic Cells ◽  
Parameters Estimation ◽  
Accurate Estimation ◽  
Well Performance ◽  
Estimation Of Parameters ◽  
Salp Swarm Algorithm ◽  
Swarm Algorithm ◽  
Parameter Values

Solar photovoltaic (PV) systems have recently attracted researcher’s attention as a clean source of energy. Thus, the importance to design appropriately the photovoltaic cells highly raises. The main problems faced in the design process are first, the development of a useful model describing the characteristics of the current vs. voltage able to simulate the real solar cells behaviours and then, the precise estimation of photovoltaic cells parameter values. This paper employs an improved version of Salp Swarm Algorithm called Chaotic Salp Swarm Algorithm (CSSA) for the parameters estimation of solar cells in both single and double diode models. CSSA approach benefits from chaotic maps proprieties, and has the advantage of providing good equilibrium between exploration and exploitation mechanisms as well. Performance of the proposed CSSA is compared to fourteen known algorithms. Experimental results demonstrate that the proposed algorithm has the ability to find the optimal solutions with an accurate estimation of parameters for the courant vs voltage characteristics of real solar cell with high performance.

Anatomical Coordinate Systems for Human Body Segments

1978 ◽  
Vol 22 (1) ◽  
pp. 676-679
Author(s):  
Arvind J. Padgaonkar ◽  
Shirley M. Lawson ◽  
Albert I. King
Keyword(s):  
Human Body ◽  
Body Motion ◽  
Anatomical Landmarks ◽  
Coordinate Systems ◽  
Body Segment ◽  
X Ray ◽  
Body Segments ◽  
Fixed Set ◽  
Injury Research ◽  
Impact Injury

An anatomically based coordinate system is a useful tool for standardizing the placement of instrumentation on segments of the human body or human surrogate. It is suggested that this system be based upon a fixed set of anatomical landmarks that are easily located by palpation and/or x-ray. A set of coordinate systems for the head, torso and extremities is proposed. Such systems will aid investigators in comparing data acquired at different laboratories involved in impact injury research. These systems can also be used for accurately locating the center of gravity of a body segment and for describing body motion in an impact environment.

scholarly journals ECG Localization Method Based on Volume Conductor Model and Kalman Filtering

Sensors ◽  
2021 ◽  
Vol 21 (13) ◽  
pp. 4275
Author(s):  
Yuki Nakano ◽  
Essam A. Rashed ◽  
Tatsuhito Nakane ◽  
Ilkka Laakso ◽  
Akimasa Hirata
Keyword(s):  
Heart Disease ◽  
Kalman Filtering ◽  
Source Localization ◽  
Human Body ◽  
Source Location ◽  
Volume Conductor ◽  
Accurate Estimation ◽  
Current Direction ◽  
Localization Method ◽  
Volume Conductor Model

The 12-lead electrocardiogram was invented more than 100 years ago and is still used as an essential tool in the early detection of heart disease. By estimating the time-varying source of the electrical activity from the potential changes, several types of heart disease can be noninvasively identified. However, most previous studies are based on signal processing, and thus an approach that includes physics modeling would be helpful for source localization problems. This study proposes a localization method for cardiac sources by combining an electrical analysis with a volume conductor model of the human body as a forward problem and a sparse reconstruction method as an inverse problem. Our formulation estimates not only the current source location but also the current direction. For a 12-lead electrocardiogram system, a sensitivity analysis of the localization to cardiac volume, tilted angle, and model inhomogeneity was evaluated. Finally, the estimated source location is corrected by Kalman filter, considering the estimated electrocardiogram source as time-sequence data. For a high signal-to-noise ratio (greater than 20 dB), the dominant error sources were the model inhomogeneity, which is mainly attributable to the high conductivity of the blood in the heart. The average localization error of the electric dipole sources in the heart was 12.6 mm, which is comparable to that in previous studies, where a less detailed anatomical structure was considered. A time-series source localization with Kalman filtering indicated that source mislocalization could be compensated, suggesting the effectiveness of the source estimation using the current direction and location simultaneously. For the electrocardiogram R-wave, the mean distance error was reduced to less than 7.3 mm using the proposed method. Considering the physical properties of the human body with Kalman filtering enables highly accurate estimation of the cardiac electric signal source location and direction. This proposal is also applicable to electrode configuration, such as ECG sensing systems.

scholarly journals Quadrature Demodulator-Assisted Estimation of Load Voltage and Resistance Based on Primary-Side Information of a Wireless Power Transfer Link

Electronics ◽  
2021 ◽  
Vol 10 (15) ◽  
pp. 1858
Author(s):  
Or Trachtenberg ◽  
Alon Kuperman
Keyword(s):  
Side Information ◽  
Wireless Power Transfer ◽  
Accurate Estimation ◽  
Power Transfer ◽  
Wireless Power ◽  
Feedback Communication ◽  
Quadrature Demodulation ◽  
Light Load ◽  
Parameter Values ◽  
Conduction Mode

This paper proposes an algorithm for the extraction of primary-side first harmonic voltage and current components for inductive wireless power transfer (WPT) links by employing quadrature demodulation. Such information allows for the accurate estimation of corresponding receiver-side components and hence permits the monitoring of the output voltage and resistance necessary for protection and/or control without using either sensors or feedback communication. It is shown that precision estimation is held as long as the parameter values of the system are known and the phasor-domain equivalent circuit is valid (i.e., in continuous conduction mode). On the other hand, upon light load operation (i.e., in discontinuous conduction mode), the proposed technique may still be employed if suitable nonlinear correction is employed. The methodology is applied to a 400 V, 1 kW inductive WPT link operating at a load-independent-voltage-output frequency and is well-verified both by simulations and experiments.

Sign in / Sign up

Export Citation Format

Share Document