Population Synthesis with Subregion-Level Control Variable Aggregation

2009 ◽  
Vol 135 (9) ◽  
pp. 632-639 ◽  
Author(s):  
Joshua A. Auld ◽  
Abolfazl (Kouros) Mohammadian ◽  
Kermit Wies
Keyword(s):  
Control Variable ◽  
Population Synthesis ◽  
Level Control ◽  
Variable Aggregation

scholarly journals Conservation law for self-paced movements

2016 ◽  
Vol 113 (31) ◽  
pp. 8831-8836 ◽  
Author(s):  
Dongsung Huh ◽  
Terrence J. Sejnowski
Keyword(s):  
Optimal Control ◽  
Scaling Law ◽  
Control Variable ◽  
Level Control ◽  
Internal Motivation ◽  
Internal States ◽  
Motivation Level ◽  
High Level ◽  
The Brain ◽  
Biological Motor

Optimal control models of biological movements introduce external task factors to specify the pace of movements. Here, we present the dual to the principle of optimality based on a conserved quantity, called “drive,” that represents the influence of internal motivation level on movement pace. Optimal control and drive conservation provide equivalent descriptions for the regularities observed within individual movements. For regularities across movements, drive conservation predicts a previously unidentified scaling law between the overall size and speed of various self-paced hand movements in the absence of any external tasks, which we confirmed with psychophysical experiments. Drive can be interpreted as a high-level control variable that sets the overall pace of movements and may be represented in the brain as the tonic levels of neuromodulators that control the level of internal motivation, thus providing insights into how internal states affect biological motor control.

scholarly journals Acceleration Level Control of Redundant Manipulators with Physical Constraints Compliance and Disturbance Rejection under Complex Environment

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Jinglun Liang ◽  
Yisheng Rong ◽  
Guoliang Ye ◽  
Xiaoxiao Li ◽  
Jianwen Guo ◽  
...  
Keyword(s):  
Hybrid Control ◽  
Robot Manipulators ◽  
Control Variable ◽  
Inequality Constraints ◽  
Physical Structure ◽  
Joint Torque ◽  
Level Control ◽  
Physical Constraints ◽  
Acceleration Level ◽  
Control Scheme

Investigation of joint torque constraint compliance is of significance for robot manipulators especially working in complex environments. A lot of which is attributed to that, on the one hand, it is beneficial to the improvement of both safety and reliability of the mission execution. On the other hand, the energy consumption required by the robot to complete the desired mission can be reduced. Most existing schemes do not take the joint torque limit and other inherent physical structure limits in a manipulator into account at the same time. In addition, many unavoidable uncertainties such as the external environmental disturbance and/or electromagnetism interferences in the circuit system may influence the accuracy and effectiveness of the task execution for a robot. In this study, we cast light on the acceleration level control of redundant robot manipulators considering both four physical constraint limits and interference rejection. A robust unified quadratic-programming-based hybrid control scheme is proposed, where the joint torque constraints are converted as two inequality constraints based on the robots’ dynamics equation. A recurrent-neural-network-based controller is designed for solving the control variable. Numerical experiments performing in PUMA 560 manipulator and planer manipulator illustrate that a rational torque distribution is obtained among the joints and the considered physical structural vectors are all restricted to the respective constraint range. In addition, even disturbed by the noise, the manipulator still successfully tracks the desired trajectory under the proposed control scheme.

The growth-profitability nexus among Swedish SMEs

2015 ◽  
Vol 11 (4) ◽  
pp. 531-547 ◽  
Author(s):  
Darush Yazdanfar ◽  
Peter Öhman
Keyword(s):  
Financial Management ◽  
Fixed Effects ◽  
Firm Growth ◽  
Management Practices ◽  
Control Variable ◽  
Sustainable Growth ◽  
Least Squares Regression ◽  
Level Control ◽  
Firm Level ◽  
Content Type

Purpose – The purpose of this paper is to examine the growth-profitability nexus among small- and medium-sized enterprises (SMEs). Design/methodology/approach – The data comprise 106,884 observations covering 26,721 Swedish SMEs in six industry sectors over the 2008-2011 period. The data were analysed using several statistical techniques, including two-stage least squares regression, fixed-effects and random regressions, and bootstrapped quantile regression. Findings – Consistent with the hypotheses derived from the resource-based approach, the results indicate that current profitability significantly and positively affects firm growth. The firm-level control variable size significantly and positively affects firm growth, though firm age significantly and negatively affects growth. Firm industry affiliation also affects firm growth. Research limitations/implications – Since SME performance is commonly equated with access to knowledge, consultancy services or business training programmes sponsored by governmental organizations can help SMEs improve their management skills and thereby their performance. Moreover, adopting advanced financial management practices can improve the use of financial resources, leading to higher profitability and thereby sustainable growth. This implies that managers should change their strategy from “growth now, profitability later” to “profitable growth now”. Originality/value – Unlike most previous studies, this study employs several multivariate methods to analyse a comprehensive, cross-sectoral sample comprising non-financial, independent, and active SMEs in several industries. This study focuses explicitly on SMEs, which play a fundamental role in the Swedish economy.

scholarly journals Stability of hand force production. I. Hand level control variables and multifinger synergies

2017 ◽  
Vol 118 (6) ◽  
pp. 3152-3164 ◽  
Author(s):  
Sasha Reschechtko ◽  
Mark L. Latash
Keyword(s):  
Visual Feedback ◽  
Neural Control ◽  
Control Variable ◽  
Force Production ◽  
Uncontrolled Manifold ◽  
Total Force ◽  
Level Control ◽  
Control Variables ◽  
Finger Forces ◽  
Hand Action

We combined the theory of neural control of movement with referent coordinates and the uncontrolled manifold hypothesis to explore synergies stabilizing the hand action in accurate four-finger pressing tasks. In particular, we tested a hypothesis on two classes of synergies, those among the four fingers and those within a pair of control variables, stabilizing hand action under visual feedback and disappearing without visual feedback. Subjects performed four-finger total force and moment production tasks under visual feedback; the feedback was later partially or completely removed. The “inverse piano” device was used to lift and lower the fingers smoothly at the beginning and at the end of each trial. These data were used to compute pairs of hypothetical control variables. Intertrial analysis of variance within the finger force space was used to quantify multifinger synergies stabilizing both force and moment. A data permutation method was used to quantify synergies among control variables. Under visual feedback, synergies in the spaces of finger forces and hypothetical control variables were found to stabilize total force. Without visual feedback, the subjects showed a force drift to lower magnitudes and a moment drift toward pronation. This was accompanied by disappearance of the four-finger synergies and strong attenuation of the control variable synergies. The indexes of the two types of synergies correlated with each other. The findings are interpreted within the scheme with multiple levels of abundant variables. NEW & NOTEWORTHY We extended the idea of hierarchical control with referent spatial coordinates for the effectors and explored two types of synergies stabilizing multifinger force production tasks. We observed synergies among finger forces and synergies between hypothetical control variables that stabilized performance under visual feedback but failed to stabilize it after visual feedback had been removed. Indexes of two types of synergies correlated with each other. The data suggest the existence of multiple mechanisms stabilizing motor actions.

Stellar Population Synthesis in AGN Host Galaxies

2001 ◽  
Vol 1 ◽  
pp. 145-152
Author(s):  
M. Joly ◽  
C. Boisson ◽  
J. Moultaka ◽  
D. Pelat
Keyword(s):  
Stellar Population ◽  
Population Synthesis ◽  
Host Galaxies ◽  
Stellar Population Synthesis

Association between Socioeconomic Factors and Postoperative Complications of Cholecystectomy

2021 ◽  
pp. 1-13
Author(s):  
Herman Romero Ramírez ◽  
Norma Muñoz Albán ◽  
Consuelo Albán Meneses ◽  
Alicia Escobar Torres
Keyword(s):  
Laparoscopic Cholecystectomy ◽  
Postoperative Complications ◽  
Socioeconomic Factors ◽  
Control Variable ◽  
Laparoscopic Technique ◽  
Safe Operation ◽  
Conventional Surgery ◽  
Socioeconomic Characteristics ◽  
Dependent Variables ◽  
Education Levels

The article´s goal isto determine if socioeconomic factors influence the postoperative complications of cholecystectomy. For this, the observational study was defined, analytical and quantitative study was conducted in 100 patients who underwent cholecystectomy. A logistic regression model was applied in which risk factors, socioeconomic characteristics, along with a control variable, were incorporated as variables. Three models were run with alternative dependent variables that are delimited by the type of postoperative complication recorded. The results found showed that women show a higher risk of presenting complications after cholecystectomy, the same occurs in older patients. Likewise, the risk is much lower in people with higher education levels and in patients who underwent laparoscopic cholecystectomy, they only have a 5% risk of presenting complications. Postoperative complications after cholecystectomy are minimized by using the laparoscopic technique and socioeconomic factors would influence the risk of suffering postoperative complications after said surgery, which makes laparoscopic cholecystectomy a safe operation with many other benefits and advantages over traditional or conventional surgery.

Pengaruh Konvergensi International Financial Reporting Standards (Ifrs) Terhadap Penghindaran Pajak(Tax Avoidance)

2018 ◽  
Vol 26 (2) ◽  
pp. 158-169
Author(s):  
Umi Wahidah ◽  
Sri Ayem
Keyword(s):  
Financial Reporting ◽  
Tax Evasion ◽  
Stock Exchange ◽  
Control Variable ◽  
Tax Avoidance ◽  
Sampling Technique ◽  
International Financial Reporting Standards ◽  
Reporting Standards ◽  
Control Variables ◽  
Financial Reporting Standards

This research aimed to examine the effect of the convergence of International Financial Reporting Standards (IFRS) on tax avoidance on companies listed in Indonesia Stock Exchange. Tax avoidance that used in this research was Cash Efective Tax Rate (CETR). This research is also use the control variable to get other different influence that different such as CSR, size, and earning management (EM. This research used populations sector of transport service companies that listed in Indonesia Stock Exchange. The data of this research taken from secondary data that was from the Indonesia Stock Exchange in the form of Indonesian Capital Market Directory (ICMD) and the annual report of the company 2011-2015. The method of collecting sample was purposive sampling technique, the population that to be sampling in this research was populations that has the criteria of a particular sample. Companies that has the criteria of the research sample as many as 78 companies. The method of analysis used in this research is multiple regression analysis. Based on regression testing shows that the convergence of International Financial Reporting Standards (IFRS) has a positiveand significant impact on tax evasion. This shows that IFRS convergence actually improves tax evasion practices. The control variables of firm size and earnings management also significantly influence the application of IFRS in improving tax avoidance practices, while CSR control variables have no role in convergence IFRS in improving tax evasion practice.

Pengaruh Pengalaman Usaha Dan Penggunaan Informasi Akuntansi Pelaku Usaha Mikro Kecil Menengah Terhadap Keberhasilan Usaha

2019 ◽  
Vol 6 (1) ◽  
pp. 27-39
Author(s):  
Khoirunnisa Cahya Firdarini
Keyword(s):  
Structural Equation ◽  
Small And Medium Enterprises ◽  
Control Variable ◽  
Accounting Information ◽  
Total Sample ◽  
Creative Industries ◽  
Business Success ◽  
Statistical Tool ◽  
Business Experience ◽  
Medium Enterprises

Accounting information has an important role to achieve business success, as well as for small businesses.This research examines the effect of business experience and accounting information system used toward business success with age of business as control variable. The population of this research are small and medium enterprises (SMEs) in creative industries sector operated in Yogyakarta district. Based on purposive sampling method, total sample of this research is 200 SMEs. Statistical tool utilized to test the hypothesis in this study is path analysis using structural equation modelling (SEM). The test result shows that business experience and accounting information have positive and significant effect to the success of SMEs.

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