The Dynamic Usage of Models (DYSAM) as a Theoretically-Based Phenomenological Tool for Managing Complexity and as a Research Framework

Author(s):  
Gianfranco Minati

In this paper, after recalling some fundamental concepts used in the science of complexity, we focus on theoretical and applicative cases of interest for the science of management of complex systems, where processes of emergence occur with the acquisition of new properties. The tool proposed is the DYnamical uSAge of Models (DYSAM). Within this framework we then focus upon a) the theoretical difference between growth and development; b) the sustainability of development rather than of growth as originally introduced in the literature; c) the concept of long tail (when, after initial large volume sales, low-revenue and infrequent buying may become a very important percentage of the entire business) as in telecommunications and management of long-tailed systems; d) non-reductionist management of complexity not reduced to solutions, and e) a future line of research to model processes of emergence.

1997 ◽  
Vol 1 (2) ◽  
pp. 45-54 ◽  
Author(s):  
Samson E. Edo

The Nigerian Capital Market achieved a significant growth during the period of privatisation (1988-1993). Through the process of privatisation, a large volume of shares was transferred from government to individual and institutional investors. The shares were offered for sale through the capital market either by placement or quotation at the Stock Exchange. As a result, the capital market expanded in terms of facilities and activities as shown by various indicators. In the same period, Nigeria entred the global equity market as one of the emerging capital markets in the world. It also became one of only four African capital markts to be so acknowledged. Despite these encouraging developments, its potentials for enhancing economic growth and development are yet to be fully exploited. In view of this, policy recomendations have been proffered to further enhance the capital market in readiness for its role in economic growth and development.


2020 ◽  
Vol 3 ◽  
pp. 83-94
Author(s):  
Gianfranco Minati

Approaches for representing quantitative processes of growth for single systems are considered focussing especially upon logistic growth processes. Attention is then extended to processes of growth for complex systems such as Multiple Systems comprising components belonging to more than one system. Complex system populations of growth processes are considered in an attempt to gain an understanding of their growth. We consider in this regard various possible approaches for understanding development and its being an emergent property. We present some possible ways of understanding emergent development which can not be suitably considered as being reducible to the properties of sequences of processes of growth.


Rangifer ◽  
2005 ◽  
Vol 25 (3) ◽  
pp. 39 ◽  
Author(s):  
Öje Danell

A series of transformations and adaptations in the Sami use of land for their subsistence over a long period of time has led to the reindeer husbandry of today. In Sweden the Sami rights to land and water are today legally connected to the practising of reindeer husbandry as a livelihood. Together with a few associated commodities, it has become considered is the only lasting Sami land-use. In the Sami culture, a central element is the association of the people with the land and the subsistence on what is provided in nature. Consequently, this association between people and land is today kept alive by the reindeer husbandry practiced as a livelihood, which thereby also produces and manages an essential base for the culture. The developments in the surrounding society are currently reducing the latitude for the reindeer industry at an accelerated rate and thereby also its capacity to handle new situations. In the complicated ecological, economic, social and institutional contexts, where reindeer husbandry is practiced, there is a large risks for sudden and unpredicted disintegrations and collapses at different system levels. The consequences thereof for the long term continuation and adaptability of Sami land use are largely unpredictable. If it leads to a collapse of reindeer industry as mode of land-use, the risks of additional deterioration of the Sami indigenous rights is also apparent and thereby the scope for new solutions as well. This will likely have serious negative consequences for the viability of the Sami culture concurrently with declining live dependences of the land. The situation of reindeer husbandry has similarities with management crises in many other integrated socio-ecological systems, which have led to sustainability failures and unpredicted consequences. These insights seem to be deficient in the treatment of the problems, which reindeer industry is facing. Scientists could probably make a very important contribution by elucidating these circumstances. This requires the adoption of a new approach based on complex systems thinking, where possible changes associated with internal and external conditions can be analysed across system borders, scales and disciplines. A possible conceptual framework for such analyses would be the theories evolved around adaptive transformations in integrated human and natural systems, now becoming a vital part of sustainability science. Fundamental in this framework is the integration of physical, ecological, economic, social and institutional systems via adaptive cycles. These are characterised by four consecutive key processes, which are repeated irregularly over time, namely growth and development, maturation with increasing vulnerability, gradual or sudden disintegration and collapse, and release of resources and values for controlled or uncontrolled reorganisation, growth and development. The connections span over temporal and spatial or social scales, the rate and magnitude of changes in different variables depend to some extent of the scale. Typical for such complex systems are a high degree of dynamics with simultaneous changes in different parts of the system, uncertainty and unpredictability, varying vulnerability over time, multiple stability domains, and inbuilt non-linearities which may cause the system to flip into another trajectories or stability domains when challenges exceed the ability of the system to absorb disturbances without loosing its functions (i.e. resilience). The latter typically happens after decreased resilience which may have many different causes. This may be due to different slow and maybe ignored losses of key resources or abilities to utilise them, slow accumulations of adverse circumstances such as external disturbances, losses of functional diversities, decreased capability to adopt novelties, loss of social capabilities, trust or ability of learning, rigid institutions, etc. It is generally suggested that the management of complex systems should promote the building and maintenance of resilience, creative self-organisations, learning and diversity, rather than strive for decreased variation and stability in the conventional sense. The complex system view is much closer the actual “soul” of reindeer husbandry, which by necessity is characterised by maintaining flexibility, living with uncertainty and continuously adapting to prevailing conditions. This stands in sharp contrast to the “control and command” type of management, which is usually investigated and imposed on the reindeer industry.


Author(s):  
Randy Moore

Cell and tissue interactions are a basic aspect of eukaryotic growth and development. While cell-to-cell interactions involving recognition and incompatibility have been studied extensively in animals, there is no known antigen-antibody reaction in plants and the recognition mechanisms operating in plant grafts have been virtually neglected.An ultrastructural study of the Sedum telephoides/Solanum pennellii graft was undertaken to define possible mechanisms of plant graft incompatibility. Grafts were surgically dissected from greenhouse grown plants at various times over 1-4 weeks and prepared for EM employing variations in the standard fixation and embedding procedure. Stock and scion adhere within 6 days after grafting. Following progressive cell senescence in both Sedum and Solanum, the graft interface appears as a band of 8-11 crushed cells after 2 weeks (Fig. 1, I). Trapped between the buckled cell walls are densely staining cytoplasmic remnants and residual starch grains, an initial product of wound reactions in plants.


Author(s):  
Vicki L. Baliga ◽  
Mary Ellen Counts

Calcium is an important element in the growth and development of plants and one form of calcium is calcium oxalate. Calcium oxalate has been found in leaf seed, stem material plant tissue culture, fungi and lichen using one or more of the following methods—polarized light microscopy (PLM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and x-ray diffraction.Two methods are presented here for qualitatively estimating calcium oxalate in dried or fixed tobacco (Nicotiana) leaf from different stalk positions using PLM. SEM, coupled with energy dispersive x-ray spectrometry (EDS), and powder x-ray diffraction were used to verify that the crystals observed in the dried leaf with PLM were calcium oxalate.


Author(s):  
J. J. Laidler

The presence of three-dimensional voids in quenched metals has long been suspected, and voids have indeed been observed directly in a number of metals. These include aluminum, platinum, and copper, silver and gold. Attempts at the production of observable quenched-in defects in nickel have been generally unsuccessful, so the present work was initiated in order to establish the conditions under which such defects may be formed.Electron beam zone-melted polycrystalline nickel foils, 99.997% pure, were quenched from 1420°C in an evacuated chamber into a bath containing a silicone diffusion pump fluid . The pressure in the chamber at the quenching temperature was less than 10-5 Torr . With an oil quench such as this, the cooling rate is approximately 5,000°C/second above 400°C; below 400°C, the cooling curve has a long tail. Therefore, the quenched specimens are aged in place for several seconds at a temperature which continuously approaches the ambient temperature of the system.


Author(s):  
G. M. Hutchins ◽  
J. S. Gardner

Cytokinins are plant hormones that play a large and incompletely understood role in the life-cycle of plants. The goal of this study was to determine what roles cytokinins play in the morphological development of wheat. To achieve any real success in altering the development and growth of wheat, the cytokinins must be applied directly to the apical meristem, or spike of the plant. It is in this region that the plant cells are actively undergoing mitosis. Kinetin and Zeatin were the two cytokinins chosen for this experiment. Kinetin is an artificial hormone that was originally extracted from old or heated DNA. Kinetin is easily made from the reaction of adenine and furfuryl alcohol. Zeatin is a naturally occurring hormone found in corn, wheat, and many other plants.Chinese Spring Wheat (Triticum aestivum L.) was used for this experiment. Prior to planting, the seeds were germinated in a moist environment for 72 hours.


2015 ◽  
Vol 58 ◽  
pp. 61-70 ◽  
Author(s):  
Paul B. Larsen

Ethylene is the simplest unsaturated hydrocarbon, yet it has profound effects on plant growth and development, including many agriculturally important phenomena. Analysis of the mechanisms underlying ethylene biosynthesis and signalling have resulted in the elucidation of multistep mechanisms which at first glance appear simple, but in fact represent several levels of control to tightly regulate the level of production and response. Ethylene biosynthesis represents a two-step process that is regulated at both the transcriptional and post-translational levels, thus enabling plants to control the amount of ethylene produced with regard to promotion of responses such as climacteric flower senescence and fruit ripening. Ethylene production subsequently results in activation of the ethylene response, as ethylene accumulation will trigger the ethylene signalling pathway to activate ethylene-dependent transcription for promotion of the response and for resetting the pathway. A more detailed knowledge of the mechanisms underlying biosynthesis and the ethylene response will ultimately enable new approaches to be developed for control of the initiation and progression of ethylene-dependent developmental processes, many of which are of horticultural significance.


1999 ◽  
Vol 9 (1) ◽  
pp. 5-6
Author(s):  
Carrie Bain ◽  
Nan Bernstein Ratner

Due to the large volume of fluency-related publications since the last column, we have chosen to highlight those articles of highest potential clinical relevance.


2016 ◽  
Vol 1 (11) ◽  
pp. 81-85
Author(s):  
Melanie Hudson

The Clinical Fellowship Experience is described by the American Speech-Hearing-Language Association (ASHA) as the transition period from constant supervision to independent practitioner. It is typically the first paid professional experience for the new graduate, and may be in a setting with which the new clinician has little or even no significant practical experience. The mentor of a clinical fellow (CF) plays an important role in supporting the growth and development of this new professional in areas that extend beyond application of clinical skills and knowledge. This article discusses how the mentor may provide this support within a framework that facilitates the path to clinical independence.


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