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  • Publication
    Public Review - A Cooperative Uplink Power Control Scheme for Elastic Data Services in Wireless CDMA Systems
    (2006-07-01) Guérin, Roch A
    This is a paper that is actually an excellent illustration of how CCR differs from more traditional publications, and also one for which I am glad to have the opportunity to write a public review that hopefully can shed some light on the reasons behind its acceptance. Don’t get me wrong, this is not a paper that I regret seeing in CCR, but this is paper that most likely would not have been accepted in most other publications, including conferences and workshops, at least not in its first submission. The focus of the paper is on resource management on the uplink of a CDMA wireless system, and in particular the combination of an admission control algorithm and a cooperative power control algorithm that maximize a utility function across admitted mobiles while taking QoS requirements into account. The topic is arguably important given the growing presence of CDMA wireless systems and the emergence of new standards such EVDO-1X Rev. A, which offer a range of new options allowing the use of "independent" transmission policies by mobile devices rather than always subjecting them to tight control from the base station. Understanding, if, when, and how such flexibility can be beneficial or harmful is an interesting and timely research area.
  • Publication
  • Publication
    Reimagining Robotic Walkers For Real-World Outdoor Play Environments With Insights From Legged Robots: A Scoping Review
    (2021-05-03) Stewart-Height, Abriana; Koditschek, Daniel E; Johnson, Michelle J
    PURPOSE For children with mobility impairments, without cognitive delays, who want to participate in outdoor activities, existing assistive technology (AT) to support their needs is limited. In this review, we investigate the control and design of a selection of robotic walkers while exploring a selection of legged robots to develop solutions that address this gap in robotic AT. METHOD We performed a comprehensive literature search from four main databases: PubMed, Google Scholar, Scopus, and IEEE Xplore. The keywords used in the search were the following: “walker”, “rollator”, “smart walker”, “robotic walker”, “robotic rollator”. Studies were required to discuss the control or design of robotic walkers to be considered. A total of 159 papers were analyzed. RESULTS From the 159 papers, 127 were excluded since they failed to meet our inclusion criteria. The total number of papers analyzed included publications that utilized the same device, therefore we classified the remaining 32 studies into groups based on the type of robotic walker used. This paper reviewed 15 different types of robotic walkers. CONCLUSIONS The ability of many-legged robots to negotiate and transition between a range of unstructured substrates suggests several avenues of future consideration whose pursuit could benefit robotic AT, particularly regarding the present limitations of wheeled paediatric robotic walkers for children’s daily outside use. For more information: Kod*lab (link to kodlab.seas.upenn.edu)