The Early Development of Control Theory. II

1976 ◽  
Vol 98 (3) ◽  
pp. 224-235 ◽  
Author(s):  
A. T. Fuller
Keyword(s):  
Control Theory ◽  
Control Systems ◽  
Early Development ◽  
Speed Control ◽  
Integral Control ◽  
History Of ◽  
History Of Control

In a previous paper Airy’s contributions to control theory were reviewed, and the developments in control which led up to Airy’s 1840 paper were summarized. The present paper continues the investigation into the history of control theory, and is mainly concerned with Maxwell’s paper of 1868. A preliminary background study deals with the development of integral control during 1837–1868. Then an expanded version is given of Maxwell’s rather terse exposition of stability of speed control systems.

The Early Development of Control Theory

1976 ◽  
Vol 98 (2) ◽  
pp. 109-118 ◽  
Author(s):  
A. T. Fuller
Keyword(s):  
Control Theory ◽  
Closed Loop ◽  
Block Diagram ◽  
Feedback System ◽  
Nyquist Diagram ◽  
System A ◽  
Integral Action ◽  
History Of ◽  
History Of Control ◽  
Diagram Techniques

The early history of control theory is explored, beginning with the contributions of Hooke and Huygens in the seventeenth century, and ending with Airy’s papers of 1840 and 1851. It is argued that, despite appearances to the contrary, Huygens’ speed control system is actually a feedback system. A proof is given that the Huygens-Hooke parabolic governor has integral action, thus eliminating offset. A detailed exposition of Airy’s techniques is given. It is shown that he used a disguised form of linearization. Airy’s system is also investigated using block diagram and Nyquist diagram techniques. The centrifugal governor is shown to have a tendency to resonance which adversely affects closed-loop stability; in agreement with Airy’s findings. Biographical notes on the main contributors are included in order to bring out the background and motivations of their theories.

Individual differences, social attention, and the history of the social motivation hypotheses of autism

2019 ◽  
Vol 42 ◽  
Author(s):  
Peter C. Mundy
Keyword(s):  
Individual Differences ◽  
Early Development ◽  
Emotional Development ◽  
Social Motivation ◽  
Social Attention ◽  
Social Emotional Development ◽  
Social Emotional ◽  
Precise Understanding ◽  
The Social ◽  
History Of

Abstract The stereotype of people with autism as unresponsive or uninterested in other people was prominent in the 1980s. However, this view of autism has steadily given way to recognition of important individual differences in the social-emotional development of affected people and a more precise understanding of the possible role social motivation has in their early development.

A Reflection on Crucial Periods in 50 Years of Social Psychology (in Germany)

2019 ◽  
Vol 50 (1) ◽  
pp. 1-6
Author(s):  
Katja Corcoran ◽  
Michael Häfner ◽  
Mathias Kauff ◽  
Stefan Stürmer
Keyword(s):  
Social Psychology ◽  
Early Development ◽  
West Germany ◽  
East And West Germany ◽  
The Future ◽  
History Of ◽  
East And West

Abstract. In this article, we reflect on 50 years of the journal Social Psychology. We interviewed colleagues who have witnessed the history of the journal. Based on these interviews, we identified three crucial periods in Social Psychology’s history, that are (a) the early development and further professionalization of the journal, (b) the reunification of East and West Germany, and (c) the internationalization of the journal and its transformation from the Zeitschrift für Sozialpsychologie to Social Psychology. We end our reflection with a discussion of changes that occurred during these periods and their implication for the future of our field.

History of vocational guidance: Origins and early development.

1942 ◽  
Author(s):  
John M. Brewer ◽  
Elizabeth J. Cleary ◽  
C. C. Dunsmoor ◽  
Jeannette S. Lake ◽  
Calvin J. Nichols ◽  
...  
Keyword(s):  
Early Development ◽  
Vocational Guidance ◽  
History Of

scholarly journals Design of control systems for ABC and speed control for autonomous vehicle

2020 ◽  
Vol 1706 ◽  
pp. 012090
Author(s):  
S Vivek ◽  
B Varsha ◽  
S Tarun Vignesh ◽  
K Anirudh ◽  
K P Peeyush
Keyword(s):  
Control Systems ◽  
Autonomous Vehicle ◽  
Speed Control

scholarly journals Latent profiles of early developmental vulnerabilities in a New South Wales child population at age 5 years

2017 ◽  
Vol 52 (6) ◽  
pp. 530-541 ◽  
Author(s):  
Melissa J Green ◽  
Stacy Tzoumakis ◽  
Kristin R Laurens ◽  
Kimberlie Dean ◽  
Maina Kariuki ◽  
...  
Keyword(s):  
Mental Illness ◽  
Mental Disorders ◽  
Mental Disorder ◽  
Early Development ◽  
Latent Class ◽  
New South ◽  
Criminal Offending ◽  
Parental History ◽  
South Wales ◽  
History Of

Objective: Detecting the early emergence of childhood risk for adult mental disorders may lead to interventions for reducing subsequent burden of these disorders. We set out to determine classes of children who may be at risk for later mental disorder on the basis of early patterns of development in a population cohort, and associated exposures gleaned from linked administrative records obtained within the New South Wales Child Development Study. Methods: Intergenerational records from government departments of health, education, justice and child protection were linked with the Australian Early Development Census for a state population cohort of 67,353 children approximately 5 years of age. We used binary data from 16 subdomains of the Australian Early Development Census to determine classes of children with shared patterns of Australian Early Development Census–defined vulnerability using latent class analysis. Covariates, which included demographic features (sex, socioeconomic status) and exposure to child maltreatment, parental mental illness, parental criminal offending and perinatal adversities (i.e. birth complications, smoking during pregnancy, low birth weight), were examined hierarchically within latent class analysis models. Results: Four classes were identified, reflecting putative risk states for mental disorders: (1) disrespectful and aggressive/hyperactive behaviour, labelled ‘misconduct risk’ ( N = 4368; 6.5%); (2) ‘pervasive risk’ ( N = 2668; 4.0%); (3) ‘mild generalised risk’ ( N = 7822; 11.6%); and (4) ‘no risk’ ( N = 52,495; 77.9%). The odds of membership in putative risk groups (relative to the no risk group) were greater among children from backgrounds of child maltreatment, parental history of mental illness, parental history of criminal offending, socioeconomic disadvantage and perinatal adversities, with distinguishable patterns of association for some covariates. Conclusion: Patterns of early childhood developmental vulnerabilities may provide useful indicators for particular mental disorder outcomes in later life, although their predictive utility in this respect remains to be established in longitudinal follow-up of the cohort.

Control Theory and Decision Making in Organisations A Reconnaissance

1970 ◽  
Vol 3 (3) ◽  
pp. T46-T48 ◽  
Author(s):  
G. L. Mallen
Keyword(s):  
Control Theory ◽  
Control Systems ◽  
Decision Process ◽  
Transfer Functions ◽  
Social Systems ◽  
Simulation Methods ◽  
Industrial Dynamics ◽  
Simulation Approach ◽  
Decision Systems ◽  
Classical Control

Differences between the domains of application of classical control theory and applied cybernetics are examined. It is suggested that a unifying concept for the understanding of both simple mechanical control systems and complex social systems is that of the decision process. Simple decision systems are equated to those for which transfer functions can be specified. Complex systems demand a simulation approach. No prescriptive organisational control theory based on simulation methods yet exists but one is required and is seen to be emerging from such diverse fields as artificial intelligence and Industrial Dynamics.

Sychronisation of Chua's Oscillator via the State Observer Technique

2003 ◽  
Vol 40 (1) ◽  
pp. 36-44
Author(s):  
Xiaogen Yin ◽  
Y. J. Cao
Keyword(s):  
Control Theory ◽  
Control Systems ◽  
Chaotic Dynamics ◽  
State Observer ◽  
Dynamical Behaviour ◽  
Simple Approach ◽  
Nonlinear Circuit ◽  
Third Order ◽  
Rich Variety ◽  
Chua’S Oscillator

Chua's oscillator is a simple autonomous third-order nonlinear circuit with a rich variety of dynamical behaviour. This paper presents a simple approach to synchronisation of Chua's oscillators using a state observer in control theory, which can be used as an interesting example for educational purposes in control systems, showing the students a simple way of coping with chaotic dynamics.

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