Situational optimization function analysis: An ideal performance analysis inspired on Lewin’s equation.

This study presents the situational optimization function analysis (SOFA) and has three aims. First, to develop a Bayesian implementation of SOFA. Second, to compare this implementation with three other maximum likelihood-based models in their accuracy to estimate true scores. The third aim is to show how joint modeling can be used for validity research. A simulation study was used to examine the second aim, while an empirical example was used to illustrate the third aim. The simulation study used three data generating processes, with varying degrees of deviation from linear models and with different sample sizes. Results of the simulation study showed that the Bayesian implementation supersedes the other models. In the empirical example, data collected from 66 participants using an iterated prisoner dilemma and a scale measuring cooperation-competition attitudes were used. Results showed that joint modeling is the best fitting model, also increasing the correlation between the true scores of both measures (deviations from the iterated prisoner dilemma and the scale). Finally, implications, limitations and future studies are discussed.

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Performance Analysis and Optimization of a 6-DOF Robotic Crusher

Journal of Robotics ◽

10.1155/2020/8812427 ◽

2020 ◽

Vol 2020 ◽

pp. 1-14

Author(s):

Guoguang Li ◽

Boqiang Shi ◽

Ruiyue Liu ◽

Jie Gu

Keyword(s):

Performance Analysis ◽

Condition Number ◽

Mechanical Performance ◽

Jacobian Matrix ◽

Screw Theory ◽

Practical Application ◽

Transmission Performance ◽

Instantaneous Power ◽

Transmission Index ◽

Optimization Function

Considering the complexity of multidimension parameters and the mechanical performance of a 6-DOF robotic crusher, a multiobjective optimization function based on the transmission index and condition number is established. As an important operation in the screw theory, the reciprocal product between the transmission wrench screw of an actuator and the output twist screw of the mantle assembly is used to represent the instantaneous power. The expression of transmission index is derived according to the principle that constraint wrench screws apply no work to the mantle assembly. It can be used as a criterion to evaluate the transmission performance. Then, based on the Jacobian matrix, the equation of condition number is constructed which provides a criterion for evaluating kinematic accuracy. Finally, the workspace and singularity of the 6-DOF robotic crusher are analyzed to verify the rationality of the optimized variables. The results show that the optimized structure can completely crush the material in the workspace and effectively avoid singularity, which provides a basis for practical application.

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Sensory and Cognitive Components of Auditory Processing in Individuals With Tinnitus

American Journal of Audiology ◽

10.1044/2019_aja-19-0011 ◽

2019 ◽

Vol 28 (4) ◽

pp. 834-842

Author(s):

Harini Vasudevan ◽

Hari Prakash Palaniswamy ◽

Ramaswamy Balakrishnan

Keyword(s):

Selective Attention ◽

Auditory Processing ◽

Function Analysis ◽

Event Related Potential ◽

Oscillatory Activity ◽

Default Mode ◽

Auditory Selective Attention ◽

Cognitive Components ◽

Mode Function ◽

Related Potentials

Purpose The main purpose of the study is to explore the auditory selective attention abilities (using event-related potentials) and the neuronal oscillatory activity in the default mode network sites (using electroencephalogram [EEG]) in individuals with tinnitus. Method Auditory selective attention was measured using P300, and the resting state EEG was assessed using the default mode function analysis. Ten individuals with continuous and bothersome tinnitus along with 10 age- and gender-matched control participants underwent event-related potential testing and 5 min of EEG recording (at wakeful rest). Results Individuals with tinnitus were observed to have larger N1 and P3 amplitudes along with prolonged P3 latency. The default mode function analysis revealed no significant oscillatory differences between the groups. Conclusion The current study shows changes in both the early sensory and late cognitive components of auditory processing. The change in the P3 component is suggestive of selective auditory attention deficit, and the sensory component (N1) suggests an altered bottom-up processing in individuals with tinnitus.

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