The Experts below are selected from a list of 113286 Experts worldwide ranked by ideXlab platform
Andries P. Engelbrecht - One of the best experts on this subject based on the ideXlab platform.
-
Set-based particle swarm optimization applied to the multidimensional knapsack problem
Swarm Intelligence, 2012Co-Authors: Joost Langeveld, Andries P. EngelbrechtAbstract:Particle swarm optimization algorithms have been successfully applied to discrete/valued optimization problems. However, in many cases the algorithms have been tailored specifically for the problem at hand. This paper proposes a Generic Set-based particle swarm optimization algorithm for use in discrete-valued optimization problems that can be formulated as Set-based problems. A detailed sensitivity analysis of the parameters of the algorithm is conducted. The performance of the proposed algorithm is then compared against three other discrete particle swarm optimization algorithms from literature using the multidimensional knapsack problem and is shown to statistically outperform the existing algorithms.
-
A Generic Set-Based Particle Swarm Optimization Algorithm
2011Co-Authors: Joost Langeveld, Andries P. EngelbrechtAbstract:Several Set-based particle swarm optimization algorithms have been proposed in the literature for solving discrete and combinatorial optimization problems. However, a simple but Generic algorithm defined in terms of mathematical Sets is still missing. In this paper a new algorithm called Set-Based PSO is proposed that fills this gap. The Multidimensional Knapsack Problem is used as a test problem to investigate the performance of the algorithm. Computational experiments are presented on a Set of problems known from the literature both for parameter tuning and to compare the algorithm’s performance to that of two alternative algorithms.
Marc Gelgon - One of the best experts on this subject based on the ideXlab platform.
-
a first attempt to computing Generic Set partitions delegation to an sql query engine
Database and Expert Systems Applications, 2014Co-Authors: Frederic Dumonceaux, Guillaume Raschia, Marc GelgonAbstract:Partitions are a very common and useful way of organizing data, in data engineering and data mining. However, partitions currently lack efficient and Generic data management functionalities. This paper proposes advances in the understanding of this problem, as well as elements for solving it. We formulate the task as efficient processing, evaluating and optimizing queries over Set partitions, in the Setting of relational databases. We first demonstrate that there is no trivial relational modeling for managing collections of partitions. We formally motivate a relational encoding and show that one cannot express all the operators of the partition lattice and Set-theoretic operations as queries of the relational algebra. We provide multiple evidence of the inefficiency of FO queries. Our experimental results enforce this evidence. We claim that there is a strong requirement for the design of a dedicated system to manage Set partitions, or at least to supplement an existing data management system, to which both data persistence and query processing could be delegated.
-
DEXA (2) - A First Attempt to Computing Generic Set Partitions: Delegation to an SQL Query Engine
Lecture Notes in Computer Science, 2014Co-Authors: Frederic Dumonceaux, Guillaume Raschia, Marc GelgonAbstract:Partitions are a very common and useful way of organizing data, in data engineering and data mining. However, partitions currently lack efficient and Generic data management functionalities. This paper proposes advances in the understanding of this problem, as well as elements for solving it. We formulate the task as efficient processing, evaluating and optimizing queries over Set partitions, in the Setting of relational databases. We first demonstrate that there is no trivial relational modeling for managing collections of partitions. We formally motivate a relational encoding and show that one cannot express all the operators of the partition lattice and Set-theoretic operations as queries of the relational algebra. We provide multiple evidence of the inefficiency of FO queries. Our experimental results enforce this evidence. We claim that there is a strong requirement for the design of a dedicated system to manage Set partitions, or at least to supplement an existing data management system, to which both data persistence and query processing could be delegated.
Joost Langeveld - One of the best experts on this subject based on the ideXlab platform.
-
Set-based particle swarm optimization applied to the multidimensional knapsack problem
Swarm Intelligence, 2012Co-Authors: Joost Langeveld, Andries P. EngelbrechtAbstract:Particle swarm optimization algorithms have been successfully applied to discrete/valued optimization problems. However, in many cases the algorithms have been tailored specifically for the problem at hand. This paper proposes a Generic Set-based particle swarm optimization algorithm for use in discrete-valued optimization problems that can be formulated as Set-based problems. A detailed sensitivity analysis of the parameters of the algorithm is conducted. The performance of the proposed algorithm is then compared against three other discrete particle swarm optimization algorithms from literature using the multidimensional knapsack problem and is shown to statistically outperform the existing algorithms.
-
A Generic Set-Based Particle Swarm Optimization Algorithm
2011Co-Authors: Joost Langeveld, Andries P. EngelbrechtAbstract:Several Set-based particle swarm optimization algorithms have been proposed in the literature for solving discrete and combinatorial optimization problems. However, a simple but Generic algorithm defined in terms of mathematical Sets is still missing. In this paper a new algorithm called Set-Based PSO is proposed that fills this gap. The Multidimensional Knapsack Problem is used as a test problem to investigate the performance of the algorithm. Computational experiments are presented on a Set of problems known from the literature both for parameter tuning and to compare the algorithm’s performance to that of two alternative algorithms.
Gerold Stucki - One of the best experts on this subject based on the ideXlab platform.
-
ICF Generic Set as new standard for the system wide assessment of functioning in China: a multicentre prospective study on metric properties and responsiveness applying item response theory
BMJ open, 2018Co-Authors: Cristina Ehrmann, Birgit Prodinger, Gerold Stucki, Wenzhi Cai, Shan Liu, Xia Zhang, Shouguo Liu, Jan D. ReinhardtAbstract:Objectives To examine metric properties and responsiveness of the International Classification of Functioning, Disability and Health (ICF) Generic Set when used in routine clinical practice to assess functioning. Design Prospective multicentre study. Setting 50 hospitals from 20 provinces of Mainland China. Participants 4510 adult inpatients admitted to the departments of Pulmonology, Cardiology, Neurology, Orthopaedics, Cerebral Surgery or Rehabilitation Medicine. Main outcome measures The ICF Generic Set (ICF Generic 6 Set) applied with an 11-point numeric rating scale (0-no problem to 10-complete problem) was fit to the Partial Credit Model (PCM) to create an interval score of functioning. Results PCM assumptions were found to be fulfilled after accounting for Differential Item Functioning. With an average improvement by 7.86 points of the metric ICF Generic 6 score (95% CI 7.53 to 8.19), the ICF Generic 6 Set proved sensitive to change (Cohen’s f2=0.41). Ceiling and floor effects on detecting change in functioning were cancelled or reduced by using the metric score. Conclusion The ICF Generic 6 Set can be used for the assessment of functioning in routine clinical practice and an interval score can be derived which is sensitive to change.
-
Towards the system-wide implementation of the International Classification of Functioning, Disability, and Health in routine clinical practice: Empirical findings of a pilot study from Mainland China.
Journal of rehabilitation medicine, 2016Co-Authors: Jan D. Reinhardt, Birgit Prodinger, Xia Zhang, Cristina Ehrmann-bostan, Melissa Selb, Gerold StuckiAbstract:OBJECTIVE The aims of this study were to evaluate the feasibility of using the International Classification of Functioning, Disability and Health (ICF) Generic Set in routine clinical practice, and of creating a functioning score based on it, and, subsequently, to examine its sensitivity to change. METHODS In this prospective cohort study, data from 761 adult inpatients from 21 Chinese hospitals were analysed. Each patient was assessed at admission and discharge. Feasibility was evaluated by analysing mean assessment time. The Rasch model was used to create a metric of functioning. Sensitivity to change was analysed with mixed-effects regression and by calculating standardized effect size based on Cohen's f2. RESULTS Mean duration of assessment was 5.3 min, with a significant decrease between admission and discharge. After removal of the item remunerative employment, the remaining ICF Generic Set categories fitted the Rasch model well. With a mean improvement in functioning of 12.1 (95% confidence interval (95% CI): 11.5-12.6), this metric proved sensitive to change, both in terms of statistical significance (p
-
toward the international classification of functioning disability and health icf rehabilitation Set a minimal Generic Set of domains for rehabilitation as a health strategy
Archives of Physical Medicine and Rehabilitation, 2016Co-Authors: Birgit Prodinger, Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Tevfik Bedirhan Ustun, Somnath Chatterji, Gerold StuckiAbstract:Abstract Objective To develop a comprehensive Set of the International Classification of Functioning, Disability and Health (ICF) categories as a minimal standard for reporting and assessing functioning and disability in clinical populations along the continuum of care. The specific aims were to specify the domains of functioning recommended for an ICF Rehabilitation Set and to identify a minimal Set of environmental factors (EFs) to be used alongside the ICF Rehabilitation Set when describing disability across individuals and populations with various health conditions. Design Secondary analysis of existing data Sets using regression methods (Random Forests and Group Lasso regression) and expert consultations. Setting Along the continuum of care, including acute, early postacute, and long-term and community rehabilitation Settings. Participants Persons (N=9863) with various health conditions participated in primary studies. The number of respondents for whom the dependent variable data were available and used in this analysis was 9264. Interventions Not applicable. Main Outcome Measures For regression analyses, self-reported general health was used as a dependent variable. The ICF categories from the functioning component and the EF component were used as independent variables for the development of the ICF Rehabilitation Set and the minimal Set of EFs, respectively. Results Thirty ICF categories to be complemented with 12 EFs were identified as relevant to the identified ICF Sets. The ICF Rehabilitation Set constitutes of 9 ICF categories from the component body functions and 21 from the component activities and participation. The minimal Set of EFs contains 12 categories spanning all chapters of the EF component of the ICF. Conclusions The identified Sets proposed serve as minimal Generic Sets of aspects of functioning in clinical populations for reporting data within and across heath conditions, time, clinical Settings including rehabilitation, and countries. These Sets present a reference framework for harmonizing existing information on disability across general and clinical populations.
-
Toward the International Classification of Functioning, Disability and Health (ICF) Rehabilitation Set: A Minimal Generic Set of Domains for Rehabilitation as a Health Strategy.
Archives of physical medicine and rehabilitation, 2016Co-Authors: Birgit Prodinger, Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Tevfik Bedirhan Ustun, Somnath Chatterji, Gerold StuckiAbstract:Abstract Objective To develop a comprehensive Set of the International Classification of Functioning, Disability and Health (ICF) categories as a minimal standard for reporting and assessing functioning and disability in clinical populations along the continuum of care. The specific aims were to specify the domains of functioning recommended for an ICF Rehabilitation Set and to identify a minimal Set of environmental factors (EFs) to be used alongside the ICF Rehabilitation Set when describing disability across individuals and populations with various health conditions. Design Secondary analysis of existing data Sets using regression methods (Random Forests and Group Lasso regression) and expert consultations. Setting Along the continuum of care, including acute, early postacute, and long-term and community rehabilitation Settings. Participants Persons (N=9863) with various health conditions participated in primary studies. The number of respondents for whom the dependent variable data were available and used in this analysis was 9264. Interventions Not applicable. Main Outcome Measures For regression analyses, self-reported general health was used as a dependent variable. The ICF categories from the functioning component and the EF component were used as independent variables for the development of the ICF Rehabilitation Set and the minimal Set of EFs, respectively. Results Thirty ICF categories to be complemented with 12 EFs were identified as relevant to the identified ICF Sets. The ICF Rehabilitation Set constitutes of 9 ICF categories from the component body functions and 21 from the component activities and participation. The minimal Set of EFs contains 12 categories spanning all chapters of the EF component of the ICF. Conclusions The identified Sets proposed serve as minimal Generic Sets of aspects of functioning in clinical populations for reporting data within and across heath conditions, time, clinical Settings including rehabilitation, and countries. These Sets present a reference framework for harmonizing existing information on disability across general and clinical populations.
-
Towards a minimal Generic Set of domains of functioning and health.
BMC public health, 2014Co-Authors: Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Somnath Chatterji, Gerold StuckiAbstract:Background The World Health Organization (WHO) has argued that functioning, and, more concretely, functioning domains constitute the operationalization that best captures our intuitive notion of health. Functioning is, therefore, a major public-health goal. A great deal of data about functioning is already available. Nonetheless, it is not possible to compare and optimally utilize this information. One potential approach to address this challenge is to propose a Generic and minimal Set of functioning domains that captures the experience of individuals and populations with respect to functioning and health. The objective of this investigation was to identify a minimal Generic Set of ICF domains suitable for describing functioning in adults at both the individual and population levels.
Alarcos Cieza - One of the best experts on this subject based on the ideXlab platform.
-
toward the international classification of functioning disability and health icf rehabilitation Set a minimal Generic Set of domains for rehabilitation as a health strategy
Archives of Physical Medicine and Rehabilitation, 2016Co-Authors: Birgit Prodinger, Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Tevfik Bedirhan Ustun, Somnath Chatterji, Gerold StuckiAbstract:Abstract Objective To develop a comprehensive Set of the International Classification of Functioning, Disability and Health (ICF) categories as a minimal standard for reporting and assessing functioning and disability in clinical populations along the continuum of care. The specific aims were to specify the domains of functioning recommended for an ICF Rehabilitation Set and to identify a minimal Set of environmental factors (EFs) to be used alongside the ICF Rehabilitation Set when describing disability across individuals and populations with various health conditions. Design Secondary analysis of existing data Sets using regression methods (Random Forests and Group Lasso regression) and expert consultations. Setting Along the continuum of care, including acute, early postacute, and long-term and community rehabilitation Settings. Participants Persons (N=9863) with various health conditions participated in primary studies. The number of respondents for whom the dependent variable data were available and used in this analysis was 9264. Interventions Not applicable. Main Outcome Measures For regression analyses, self-reported general health was used as a dependent variable. The ICF categories from the functioning component and the EF component were used as independent variables for the development of the ICF Rehabilitation Set and the minimal Set of EFs, respectively. Results Thirty ICF categories to be complemented with 12 EFs were identified as relevant to the identified ICF Sets. The ICF Rehabilitation Set constitutes of 9 ICF categories from the component body functions and 21 from the component activities and participation. The minimal Set of EFs contains 12 categories spanning all chapters of the EF component of the ICF. Conclusions The identified Sets proposed serve as minimal Generic Sets of aspects of functioning in clinical populations for reporting data within and across heath conditions, time, clinical Settings including rehabilitation, and countries. These Sets present a reference framework for harmonizing existing information on disability across general and clinical populations.
-
Development of a metric for tracking and comparing population health based on the minimal Generic Set of domains of functioning and health
Population health metrics, 2016Co-Authors: Cornelia Oberhauser, Somnath Chatterji, Carla Sabariego, Alarcos CiezaAbstract:Background The following minimal Set of valid health domains for tracking the health of both clinical and general populations has recently been proposed: 1) energy and drive functions, 2) emotional functions, 3) sensation of pain, 4) carrying out daily routine, 5) walking and moving around, and 6) remunerative employment. This study investigates whether these domains can be integrated into a sound psychometric measure to adequately assess, compare, and monitor the health of populations.
-
Toward the International Classification of Functioning, Disability and Health (ICF) Rehabilitation Set: A Minimal Generic Set of Domains for Rehabilitation as a Health Strategy.
Archives of physical medicine and rehabilitation, 2016Co-Authors: Birgit Prodinger, Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Tevfik Bedirhan Ustun, Somnath Chatterji, Gerold StuckiAbstract:Abstract Objective To develop a comprehensive Set of the International Classification of Functioning, Disability and Health (ICF) categories as a minimal standard for reporting and assessing functioning and disability in clinical populations along the continuum of care. The specific aims were to specify the domains of functioning recommended for an ICF Rehabilitation Set and to identify a minimal Set of environmental factors (EFs) to be used alongside the ICF Rehabilitation Set when describing disability across individuals and populations with various health conditions. Design Secondary analysis of existing data Sets using regression methods (Random Forests and Group Lasso regression) and expert consultations. Setting Along the continuum of care, including acute, early postacute, and long-term and community rehabilitation Settings. Participants Persons (N=9863) with various health conditions participated in primary studies. The number of respondents for whom the dependent variable data were available and used in this analysis was 9264. Interventions Not applicable. Main Outcome Measures For regression analyses, self-reported general health was used as a dependent variable. The ICF categories from the functioning component and the EF component were used as independent variables for the development of the ICF Rehabilitation Set and the minimal Set of EFs, respectively. Results Thirty ICF categories to be complemented with 12 EFs were identified as relevant to the identified ICF Sets. The ICF Rehabilitation Set constitutes of 9 ICF categories from the component body functions and 21 from the component activities and participation. The minimal Set of EFs contains 12 categories spanning all chapters of the EF component of the ICF. Conclusions The identified Sets proposed serve as minimal Generic Sets of aspects of functioning in clinical populations for reporting data within and across heath conditions, time, clinical Settings including rehabilitation, and countries. These Sets present a reference framework for harmonizing existing information on disability across general and clinical populations.
-
Towards a minimal Generic Set of domains of functioning and health.
BMC public health, 2014Co-Authors: Alarcos Cieza, Cornelia Oberhauser, Jerome Bickenbach, Somnath Chatterji, Gerold StuckiAbstract:Background The World Health Organization (WHO) has argued that functioning, and, more concretely, functioning domains constitute the operationalization that best captures our intuitive notion of health. Functioning is, therefore, a major public-health goal. A great deal of data about functioning is already available. Nonetheless, it is not possible to compare and optimally utilize this information. One potential approach to address this challenge is to propose a Generic and minimal Set of functioning domains that captures the experience of individuals and populations with respect to functioning and health. The objective of this investigation was to identify a minimal Generic Set of ICF domains suitable for describing functioning in adults at both the individual and population levels.
