A system of quadratic differential equations is proposed within the framework of 'non-linear mechanics', but also outside this framework in respect of certain features, and it is used with a view to formalising a feedback control system. The model helps to simulate states of balance or imbalance within an ago-antagonistic couple and to suggest methods for correcting the imbalances, which do not require modification of the parameter space. Its possibilities of synchronic or diachronic functioning are emphasised. The model may apparently be used for the construction of similar models which include several ago-antagonistic couples. Finally, the aims of such a model, which could be considered as an 'action' model, are defined; its place would be assigned midway between a black-box system and 'knowledge' models.
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http://dx.doi.org/10.1016/0020-7101(78)90034-x | DOI Listing |
Psychoneuroendocrinology
October 1997
Faculté de Médecine, Hôpital X. Bichat (Université Denis Diderot), Laboratoire de Biochimie Endocrinienne, Paris, France.
Two classes of steroid hormones are successively produced following a microbial infection stress in rat and man. First there are those of attenuation and acceptation, the glucocorticoids and progestins, which correspond to the temporization phase of reaction to stress. Secondly, there are those of rejection or creative reinforcement, namely the adrenal androgens converted in certain circumstances to estrogens by aromatization, which are necessary to fight against or accept the stressor.
View Article and Find Full Text PDFInt J Biomed Comput
May 1978
A system of quadratic differential equations is proposed within the framework of 'non-linear mechanics', but also outside this framework in respect of certain features, and it is used with a view to formalising a feedback control system. The model helps to simulate states of balance or imbalance within an ago-antagonistic couple and to suggest methods for correcting the imbalances, which do not require modification of the parameter space. Its possibilities of synchronic or diachronic functioning are emphasised.
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