Displaying 1 - 12 of 12 records found.
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Computer Modeling of the Immune System Reconstruction after Peripheral Blood Stem Cell Transplantation

Case
Attention is focused on the immune system reconstruction and the process of production of T- and B- lymphocytes and natural killer (NK) cells after autologous haematopoietic stem cells transplantation (HSCT). The mathematical model for leukopoiesis proposed in Periodic oscillations in leukopoiesis models with two delays is used as an initial point for investigations. HSCs in bone marrow are presented as two descrite groups: proliferating cell and non-proliferating (quiescent) cells. Quiescent...
03 Oct 2016

Effects of population and population pressure on forest resources and their conservation: a modeling study

Model
in this model, cumulative density of forest resources and population density use generalized logistic models with predatory-prey type nonlinear interactions. The model is an effort to capture not only the effect of population density on forest resources (a logistic model), but also the effect of population pressure on forest resources, which grows proportionally to population density and is limited by the carrying capacity of the forest.  Additionally, it models the effect of economic...
01 Oct 2016

Human and nature dynamics (HANDY): Modeling inequality and use of resources in the collapse or sustainability of societies

Model
HANDY is a 4-variable thought-experiment model for interaction of humans and nature. The focus is on predicting long-term behavior rather than short-term forecasting. Carrying Capacity is developed as a practical measure for forecasting collapses. A sustainable steady state is shown to be possible in different types of societies but over-exploitation of either Labor or Nature results in a societal collapse.
09 Oct 2016

Institutional features of fishery catch shares

Case
Catch shares are becoming an increasingly common mechanism to manage fishery harvests.  This case represents an analysis of the general institutional features of catch shares.  
09 Aug 2016

Leukopoiesis Model

Model
# Eqn 1:#β(Q) is the introduction rate#β0 represents the maximal rate of introduction in the proliferating phase#θ1 is the value for which β reaches half of its maximal value#n is the sen- sitivity of the rate of reintroduction#Q is the quiscent cells# Eqn 2:#k(W) is the differentiation rate#k0 is a proportionality coefficiet#m and θ2 depend on the growth factors responsible for maturation of considered white blood cells#W is lymphocytes (T, B, or NK)# Eqn 3:#Kv is the differentiation rate to...
03 Oct 2016

Life table

Model
The life table model is one of the type of survival analysis which pertains to "time to event". The information that were accumulated throughout the study is one of the advatage of this method.This often used in demographics and epidemiology but can also be used on agricultural economics. Sperling and Loevinsohn (1992) used this method in analyzing varietal diffusion for beans in which the main objective is to know howm nay technology adopters remains after a time period. 
30 Nov 2017

Measuring Riparian Width

Model
This model is a modification of an older model by Camporeale and Ridolfi (2006) that studied the influence of river flow variability on the distribution of biomass of riparian vegetation. The new and modified model defines an upper or hillside bound of riparian vegetation, in addition to the lower bound defined in the older model, and thus clearly delineate riparian width. The assumptions made in the model include:(1) Only one species is considered, thus ignoring interspecific dynamics. (2...
30 Nov 2017

Refined Pumpa Irrigation System Model

Model
This is a refined model of robustness and vulnerability trade-off of Pumpa irrigation system
22 Nov 2017

Simple Model of Farming/Gathering Transition

Model
This is a stylised model capturing "the interdependencies of foraging, farming and productivity of an ecosystem" and can be used to "explore alternative scenarios of niche construction and ecological inheritance." The model has two components, forest growth and time allocated to either foraging or farming, coupled together. Three basic model assumptions are 1) individuals are households, 2) households choose to produce either tree seeds or maize and 3) territory is open access. Allocation of...
06 Oct 2016

Social Ostracism and Resource Management

Model
This replicator dynamics model considers the case of a common-pool resource system where social ostracism may be used to compel non-complying harvesters to avoid over-exploitation of the resource base. Here, non-compliant harvesters (i.e., defectors) are identified by their payoff strategy and incur an 'ostracism' penalty proportional to the number of compliant harvesters (i.e., co-operators) in the system. When the ostracism effect is equivalent to the number of compliant harvesters and the...
07 Oct 2016

System representation template

Case
The system representation template was created to provide the key verbs analysts should utilize when describing the strategic interactions between the elements in the robustness framework (RS, RU, PIP, PI). Verbs followed by (?) are suggested additions to the verb list.
09 Aug 2016

Two-actor conflict with time delay: A dynamical model

Model
Based on previous mathematical studies, the authors created a model to analyze the conflict dynamics between two actors. In this model, they modified previous nonlinear dynamical models by Liebovitch et al. (2008) and Liebovitch, Vallacher, & Michaels (2010) by considering nonlinear delayed response between two actors. The results of the model show that under certain initial and feedback conditions, a stable neutral equilibrium of conflict may destabilize for some critical values of time...
05 Oct 2016