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|Integrated Sensorimotor Target Extraction Techniques in Untethered Drosophila Flight Control
Faruque, I.A. ; Muijres, F.T. ; Macfarlane, K.M. ; Kehlenbeck, A. ; Humberg, J.S. - \ 2018
Integrative and Comparative Biology 58 (2018)supplement 1. - ISSN 1540-7063 - p. E61 - E61.
Insects provide attractive models for micro aerial vehicle development because they achieve robust flight performance in cluttered and unstructured environments despite the relatively limited neural capability of their sensing, actuation, and control structures when compared with vertebrate flight. What feedback strategies do insects incorporate to regulate themselves to desired trajectories? We investigated this question by digitizing the flight of freely-flying fruit flies (Drosophila hydei). Three high-speed digital video cameras were used to digitize wing and body kinematics, from which sections approximating stabilized were extracted. Inverse optimal control techniques were applied to examine the composite function of the insect’s integrated sensorimotor feedback. This control extraction technique provides progress towards combining the study of individual sensors and tethered laboratory responses by using untethered trajectory information to quantify the structure, performance, and optimal control targets of the integrated sensors and neural feedback.
Identification of optimal feedback control rules from micro-quadrotor and insect flight trajectories
Faruque, Imraan A. ; Muijres, Florian T. ; Macfarlane, Kenneth M. ; Kehlenbeck, Andrew ; Humbert, J.S. - \ 2018
Biological Cybernetics 112 (2018)3. - ISSN 0340-1200 - p. 165 - 179.
Control - Drosophila - Flight - Identification - Insect - Optimal
This paper presents “optimal identification,” a framework for using experimental data to identify the optimality conditions associated with the feedback control law implemented in the measurements. The technique compares closed loop trajectory measurements against a reduced order model of the open loop dynamics, and uses linear matrix inequalities to solve an inverse optimal control problem as a convex optimization that estimates the controller optimality conditions. In this study, the optimal identification technique is applied to two examples, that of a millimeter-scale micro-quadrotor with an engineered controller on board, and the example of a population of freely flying Drosophila hydei maneuvering about forward flight. The micro-quadrotor results show that the performance indices used to design an optimal flight control law for a micro-quadrotor may be recovered from the closed loop simulated flight trajectories, and the Drosophila results indicate that the combined effect of the insect longitudinal flight control sensing and feedback acts principally to regulate pitch rate.
|Livelihood impacts of ponds in Asia-opportunities and constraints
Little, D.C. ; Karim, M. ; Turongrouang, Danai ; Morales, E.J. ; Murray, F.J. ; Barman, B.K. ; Hague, M.M. ; Kundu, N. ; Belton, B. ; Faruque, A.S.G. ; Azim, M.E. ; Islam, F.U. ; Pollock, L. ; Verdegem, M.C.J. ; Young, J.A. ; Leschen, W. ; Wahab, M.A. - \ 2007
In: Fishponds in farming systems / van der Zijpp, A.J., Verreth, J.A.J., Wageningen : Wageningen Academic Publishers - ISBN 9789086860135 - p. 177 - 202.
Shiga toxin-producing Escherichia coli isolated from patients with diarrhoea in Bangladesh
Islam, M.A. ; Heuvelink, A.E. ; Boer, E. de; Sturm, P.D. ; Beumer, R.R. ; Zwietering, M.H. ; Faruque, A.S.G. ; Haque, R. ; Sack, D.A. ; Talukder, K.A. - \ 2007
Journal of Medical Microbiology 56 (2007)3. - ISSN 0022-2615 - p. 380 - 385.
hemolytic-uremic syndrome - healthy cattle - verotoxin - children - infections - prevalence - strains - genes - o157 - pcr
The prevalence of Shiga toxin-producing Escherichia coli (STEC) and its characteristics were determined among hospitalized patients with diarrhoea and children with diarrhoea in an urban slum community of Dhaka city using sensitive culture and PCR methods. Stool samples were collected from 410 patients with diarrhoea enrolled in the 2 % surveillance system (every 50th patient attending the hospital with diarrhoeal disease is included) at the ICDDR,B hospital and from 160 children of 2¿5 years of age with diarrhoea living in an urban slum in Dhaka, between September 2004 and April 2005. Shiga toxin genes (stx) were detected by multiplex PCR in the enrichment broth of nine samples (2.2 %) from hospitalized patients and 11 samples (6.9 %) from the community patients. STEC was isolated from five stool samples with positive PCR results using a colony patch technique. All five isolates were positive in the Vero cell assay and PCR fragments of stx genes were confirmed by sequencing. Two isolates were positive for the E. coli attaching-and-effacing (eae) gene and four were positive for the enterohaemolysin (hlyEHEC) gene and enterohaemolysin production. The five isolates belonged to five different serotypes: O32 : H25, O2 : H45, O76 : H19, ONT : H25 and ONT : H19. It can be concluded that STEC is not a common pathogen in Bangladesh among hospitalized patients with diarrhoea nor among mild cases of diarrhoea in the community.
|Prevalence, serotypes and virulence genes of Shiga toxin-producing Escherichia coli (STEC) isolated from hospitalized and community diarrhoeal patients in Bangladesh
Islam, M.A. ; Heuvelink, A.E. ; Boer, E. de; Beumer, R.R. ; Zwietering, M.H. ; Faruque, A.S.G. ; Haque, R. - \ 2006
In: 11th Asian Scientific Conference on Diarrheal Disease. - - p. 121 - 121.