|
|
|
|
|
Beard, Rodney. |
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience. |
Tipo: Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
Ano: 2000 |
URL: http://purl.umn.edu/123604 |
| |
|
|
Beard, Rodney. |
An optimal stochastic control model of grazing that incorporates both pasture and livestock dynamics is presented. The model is solved numerically using Markov chain approximation methods. Markov chain approximation methods have a number of advantages as a means of solving stochastic optimal control methods compared with the usual alternatives. In particular, optimal control of the approximating Markov chain may be determined using Linear programming methods, thus making optimal stochastic control methods accessible to a wider audience. |
Tipo: Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
Ano: 2000 |
URL: http://purl.umn.edu/123643 |
| |
|
|
McAllister, Ryan; Beard, Rodney; Asufa-Adjaye, John. |
The PDR of Laos has thus far retained a large proportion of its natural forests relative to other SE Asian countries. This disproportionally high level of forestation, along with current political and economic factors, may create an increase in the demand for Laotion timber. In particular, if the Laotion government maintains responsibility for natural timber harvesting and sets sustainable rates, then the increase in demand may flow into Laos’ illegal timber market. This paper uses an optimal control model to analyse the impact of an increase in the demand for timber. It argues that the illegal timber market damages both the environment and economy. |
Tipo: Presentation |
Palavras-chave: Environmental Economics and Policy. |
Ano: 2000 |
URL: http://purl.umn.edu/123704 |
| |
|
| |
|
|
Beard, Rodney. |
von Liebigs law of the minimum is frequently proposed as a model of crop production which captures agronomic reality better than substitutional production functions. Whilst many studies of the law of the minimum and optimal fertilizer carryover have been undertaken separately, the law of the minimum for optimal fertilizer carryover has it would appear until now not been analysed, because of the non-differentiable nature of the agricultural producers objective function. In this paper I develop an optimal control model of fertilizer carryover subject to the law of the minimum using the differential inclusion approach to optimal control. |
Tipo: Presentation |
Palavras-chave: Crop Production/Industries. |
Ano: 2000 |
URL: http://purl.umn.edu/123600 |
| |
|
|
Beard, Rodney; Purcell, Tim. |
Many explanations of agricultural technology adoption have either been based loosely on diffusion concepts and have ignored economic factors or have been static economic models that ignore dynamic and spatial aspects of adoption. In this paper we propose a model of adoption which incorporates economic factors in a spatial and dynamic framework. the approach used is based on extending replicator dynamics models in evolutionary game theory to a spatial setting. The replicator dynamics of adopters versus non-adopters are characterised by a spatial diffusion model the solution of which illustrates how local institutions drive spatial technology adoption processes via the rules of the game. The model is applied to forage technology adoption in the Philippines... |
Tipo: Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
Ano: 2000 |
URL: http://purl.umn.edu/123601 |
| |
|
| |
|
|
Salerno, Gillian; McDonald, Stuart; Beard, Rodney. |
Shallow lakes display hysteresis in their response to phosphorous loading. Gradual increases in the nutrient content of the lake can appear to have little effect on the oligotrophic state of the lake until a point at which the lake suddenly flips to a eutrophic state. Ecotaxes on phosphorous loading have been suggested as means to maintain the lake in the socially desirable state - oligotrophic or not - when society can agree on a common welfare function. In this paper, we consider the case where society is divided into two interest groups and is thus unable to agree. In particular, the communities that share the use of the lake disagree on the relative importance of the shallow lake acting as a waste sink for phosphorous run-off as opposed to other... |
Tipo: Conference Paper or Presentation |
Palavras-chave: Resource /Energy Economics and Policy. |
Ano: 2007 |
URL: http://purl.umn.edu/10385 |
| |
|
|
|