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Search Results: 1 - 10 of 224204 matches for " Jobby C. Johnson "
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A Distributed Control System for Spatial Hyper Redundant Robot using CAN
N. Kiranmayee,R. Seethalakshmi,Jobby C. Johnson,Joel Jose
Journal of Artificial Intelligence , 2012,
Abstract: Spatial Hyper Redundant (SHR) robot has more controllable DOF than actual DOF due to hyper redundancy. The robot has increased dexterity and is well known for its use in unstructured environments. Due to higher controllable DOF, control system becomes extremely complex to implement. Hence, to develop the same, Controller Area Network (CAN) protocol which enables lesser number of bus signals and quite suitable in an environment where large number of microprocessor based systems are employed is used. In this case, stepper motors are used to actuate the links. This research involves in design of control system for an 8 link snake like robot using CAN protocol. A node consists of a microcontroller, CAN controller, CAN transceiver and a physical medium for transmission. A PIC 18F458 is chosen as the microcontroller which has inbuilt CAN module and it is programmed using CCS compiler for the application. The CAN communication was established by sending data from one node to other for physically actuating motions of links at its initial phase and then it was extended for multiple nodes with one node as master interfaced to GUI using RS232 on one side and to other nodes through CAN. Implementation of message filtering was done for each node. Performance of the system was also studied for multiple nodes of the system.
Cellular Localization of Gold and Mechanisms of Gold Resistance in Rhodobacter sphaeroides  [PDF]
Hannah Johnson, Ram C. Kafle, Madhusudan Choudhary
Advances in Microbiology (AiM) , 2017, DOI: 10.4236/aim.2017.78047
Abstract: Heavy metal pollution is a worldwide problem with many associated health risks, including bone loss, kidney damage, and several forms of cancer. There is a great need of bioremediation of these toxic metals from the environment, as well as implementing a monitoring system to control the spreading pollution. This study focuses on the bioremediation potential of Rhodobacter sphaeroides in the presence of the toxic gold chloride (AuCl3). Growth characteristics of the bacterial cells exposed to a range of toxic gold concentrations were analyzed through the growth kinetics and the colony forming units under aerobic, photosynthetic, and anaerobic growth conditions. The localization of the gold particles within two cellular fractions, cytoplasm and the plasma membrane, are analyzed using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Results of this study demonstrated the photosynthetic growth condition as best suited for the metal tolerance, compared to the aerobic and anaerobic growth conditions. Results also revealed the overall accumulation and localization of gold particles, while not different between the membrane and the cytoplasmic fractions increased at different concentrations of the gold contamination. The results of the localization under photosynthetic growth condition revealed the accumulation reached the highest very quickly, and an overall shift in localization of the gold particles from an equal distribution to an increase within the membrane fraction at the highest concentrations of gold contamination. The localization of the gold particles was validated by Transmission Electron Microscopy (TEM) where the results confirmed the increase in accumulation within the membrane, and photosynthetic membranes, of R. sphaeroides.
New results in subspace-stabilization control theory
C. D. Johnson
Mathematical Problems in Engineering , 2000, DOI: 10.1155/s1024123x00001289
Abstract: Subspace-stabilization is a generalization of the classical idea of stabilizing motions of a dynamical system to an equilibrium state. The concept of subspace-stabilization and a theory for designing subspace-stabilizing control laws was introduced in a previously published paper. In the present paper, two new alternative methods for designing control laws that achieve subspace-stabilization are presented. These two alternative design methods are based on: (i) a novel application of existing Linear Quadratic Regulator optimal-control theory, and (ii) an algebraic method in which the control-law is expressed as a linear feedback of certain “canonical variables.” In some cases, these new design methods may be more effective than existing ones. The results are illustrated by worked examples.
Gene Banks Pay Big Dividends to Agriculture, the Environment, and Human Welfare
R. C. Johnson
PLOS Biology , 2012, DOI: 10.1371/journal.pbio.0060148
Abstract:
Intra-psychic effects of a group intervention programme on adolescents of divorce
C. Johnson, E. Wiechers
South African Journal of Education , 2003,
Abstract: Divorce is one of the most stressful and complex mental health crises facing children today. As parents are often under tremendous stress during the time of divorce, they may be incapable of providing the support and guidance children need. The purpose of this research was evaluating the effects of an intervention programme on the self concept as well as on the levels of anxiety and depression of adolescents of divorce. A literature study was done and an empirical investigation was conducted. Eight adolescents who were still in the acute phase of the divorce process were evaluated before and after taking part in a group intervention programme. The ten-week programme was divided into three components, an affective component, a cognitive component and a support component focussing on conflict and anger management. Although the intervention programme did not serve to insulate the members from the negative effects of divorce, the findings of this research indicate that a group intervention programme can reduce feelings of anxiety and depression and enhance the self-concept. It is recommended that such an intervention programme be used as an adjunct to the normal school programme. (South African Journal of Education: 2003 22(3): 177-183)
New results in subspace-stabilization control theory
Johnson C. D.
Mathematical Problems in Engineering , 2000,
Abstract: Subspace-stabilization is a generalization of the classical idea of stabilizing motions of a dynamical system to an equilibrium state. The concept of subspace-stabilization and a theory for designing subspace-stabilizing control laws was introduced in a previously published paper. In the present paper, two new alternative methods for designing control laws that achieve subspace-stabilization are presented. These two alternative design methods are based on: (i) a novel application of existing Linear Quadratic Regulator optimal-control theory, and (ii) an algebraic method in which the control-law is expressed as a linear feedback of certain “canonical variables.” In some cases, these new design methods may be more effective than existing ones. The results are illustrated by worked examples.
Accommodation of zero-valued characteristic roots in the classical solution expression for linear, homogeneous, constant-coefficient difference equations
Johnson C. D.
Mathematical Problems in Engineering , 1996,
Abstract: Linear, constant-coefficient difference equations play a central role in many areas of engineering, where cases involving repeated zero-valued characteristic roots are sometimes of particular interest. Unfortunately, the classical solution expression presented in the mathematical literature of difference equations is not valid for this latter case. In this paper we develop a unique generalization of the classical solution expression for linear, constant-coefficient, homogeneous difference equations that accommodates the most general case of repeated zero-valued characteristic roots, thereby “completing” the classical theory. A worked example is presented to illustrate our result.
Accommodation of zero-valued characteristic roots in the classical solution expression for linear, homogeneous, constant-coefficient difference equations
C. D. Johnson
Mathematical Problems in Engineering , 1996, DOI: 10.1155/s1024123x96000403
Abstract:
A Flight of Pieris Monuste
C. W. Johnson
Psyche , 1929, DOI: 10.1155/1929/57163
Abstract:
A New Ptinid for New England
C. W. Johnson
Psyche , 1921, DOI: 10.1155/1921/52645
Abstract:
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