Time filter

Source Type

Flint, MI, United States

The University of Michigan–Flint , is a public university located in Flint, Michigan in the United States. It is one of the two University of Michigan satellite campuses. Wikipedia.

Li W.,University of Michigan-Flint
Journal of Global Optimization | Year: 2011

This study investigates the properties of the edges in a set of locally optimal tours found by multi-start search algorithm for the traveling salesman problem (TSP). A matrix data structure is used to collect global information about edges from the set of locally optimal tours and to identify globally superior edges for the problem. The properties of these edges are analyzed. Based on these globally superior edges, a solution attractor is formed in the data matrix. The solution attractor is a small region of the solution space, which contains the most promising solutions. Then an exhausted enumeration process searches the solution attractor and outputs all solutions in the attractor, including the globally optimal solution. Using this strategy, this study develops a procedure to tackler a multi-objective TSP. This procedure not only generates a set of Pareto-optimal solutions, but also be able to provide the structural information about each of the solutions that will allow a decision-maker to choose the best compromise solution. © 2011 Springer Science+Business Media, LLC. Source

Alsalaheen B.,University of Michigan-Flint
Journal of Head Trauma Rehabilitation | Year: 2015

OBJECTIVE:: To review the literature on the reliability of the Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT). DESIGN:: Systematic review of the relevant literature in PubMed, CINAHL, and PSYCHINFO. Studies were evaluated using the STROBE instrument and custom developed items. RESULTS:: Search yielded 5 943 articles. Ten studies met the inclusion criteria and were reviewed. With the exception of processing speed, all composite scores consistently exhibited poor to moderate reliability (ie, intraclass correlation coefficient <0.80). When considering 2 time points, participants who were misclassified as experiencing a “reliable change” in any score ranged between 5% and 26% for verbal memory, 2.2% and 19.6% for visual memory, 4% and 24% for processing speed, and 4% and 23.2% for reaction time. CONCLUSIONS:: The Pearson r correlation coefficient and average measures intraclass correlation coefficient may be inappropriately utilized to examine the reliability of ImPACT scores. Given the poor to moderate reliability of most ImPACT scores, clinicians should be cautious when ImPACT is used as a criterion for medical clearance to return to play after concussion. Because of its widespread use in concussion-related clinical research, researchers must exercise due diligence when utilizing ImPACT to evaluate outcomes after concussion or to validate other outcome measures. © 2015 Wolters Kluwer Health, Inc. All rights reserved. Source

Huang M.-H.,University of Michigan-Flint | Brown S.H.,University of Michigan
Gait and Posture | Year: 2013

Reaching tasks are commonly performed during daily activities and require anticipatory postural adjustments (APAs) to ensure a stable posture during movement execution. Age-related changes in APAs may impact dynamic balance and cause postural instability during reaching tasks made from standing. The present study examined age differences in postural control during reaching to targets located at different heights. Fourteen young adults (aged 20.0 ± 1.5 yrs) and 16 community-dwelling older adults (aged 73.4 ± 5.3 yrs) participated in the study. The task involved reaching forward to grasp a cylinder, and returning to an upright position as fast and accurately as possible. Postural control was analyzed using the center of pressure (COP) during four phases of the task: COP displacement during APA production, COP trajectory smoothness during the reach and return phases, and COP path length during the recovery phase following movement. APA amplitude measured by COP displacement and COP path length during the recovery phase was larger in older compared to young adults. Dynamic balance represented by COP trajectory smoothness was reduced with age. In both age groups, APA amplitude was largest and COP trajectory smoothness the least during low target reaches. The results demonstrate that, while older adults can alter APAs in order to maintain postural stability, control of COP during movement execution, particularly during low target reaches, is compromised with aging. These findings have clinical implications for both the assessment of dynamic balance and the development of balance training programs. © 2013 Elsevier B.V. Source

Li W.,University of Michigan-Flint
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

This paper introduces a multi-start search approach to dynamic traveling salesman problem (DTSP). Our experimental problem is stochastic and dynamic. Our search algorithm is dynamic because it explicitly incorporates the interaction of change and search over time. The result of our experiment demonstrates the effectiveness and efficiency of the algorithm. When we use a matrix to construct the solution attractor from the set of local optima generated by the multi-start search, the attractor-based search can provide even better result. © 2011 Springer-Verlag. Source

Alsup J.,University of Michigan-Flint | Papantonopoulos E.,National Technical University of Athens | Siopsis G.,University of Tennessee at Knoxville
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2013

We discuss a novel mechanism to set up a gravity dual of FFLO states in strongly coupled superconductors. The gravitational theory utilizes two U(1) gauge fields and a scalar field coupled to a charged AdS black hole. The first gauge field couples with the scalar sourcing a charge condensate below a critical temperature, and the second gauge field provides a coupling to spin in the boundary theory. The scalar is neutral under the second gauge field. By turning on an interaction between the Einstein tensor and the scalar, it is shown that, in the low temperature limit, an inhomogeneous solution possesses a higher critical temperature than the homogeneous case, giving rise to FFLO states. © 2013 Elsevier B.V. Source

Discover hidden collaborations