Journal: Orion

Found 110 papers in total
A model for scheduling projects under the condition of inflation and under penalty and reward arrangements
A model for scheduling projects under the condition of inflation and under penalty and reward arrangements
2001,
A zero–one mixed integer linear programming model is developed for the...
On some optimal switching strategies
On some optimal switching strategies
2001,
Systems of components with increasing failure rates are considered. Switching from an...
Distribution-free approach to the evaluation of reliability of complex systems
Distribution-free approach to the evaluation of reliability of complex systems
2002,
In the industrial community it is well known that the failure rate of the manufactured...
A Sokhotski–Plemelj problem related to a renewable T-cell
A Sokhotski–Plemelj problem related to a renewable T-cell
2005,
We analyse the long-run availability of a technical device subjected to inspections...
Relationship between the modified due date rule and the heuristic of Wilkerson and Irwin
Relationship between the modified due date rule and the heuristic of Wilkerson and Irwin
2001,
In this paper, we consider the problem of scheduling N jobs on a single machine to...
A mathematical approach to increasing the long-term wealth of an agricultural enterprise
A mathematical approach to increasing the long-term wealth of an agricultural enterprise
2003,
This study focuses on developing an agricultural investment model based upon proven...
A bio-economic application to the Cape Rock Lobster resource using a delay difference modeling approach
A bio-economic application to the Cape Rock Lobster resource using a delay difference modeling approach
2004,
In many species, like the Cape Rock Lobster ( Jasus lalandii ), the life cycles of...
Optimising an integrated crop–livestock farm using risk programming
Optimising an integrated crop–livestock farm using risk programming
2004,
Numerous studies have analysed farm planning decisions focusing on producer risk...
An analysis of the South African fruit logistics infrastructure
An analysis of the South African fruit logistics infrastructure
2004,
This paper gives an overview of a study that was done on the logistics infrastructure...
Spatial fire modeling in Mkuze Game Reserve: A case study
Spatial fire modeling in Mkuze Game Reserve: A case study
2002,
Controlled burning is a necessary and regular activity in Mzuke Game Reserve, South...
School results and access test results as indicators of first-year performance at university
School results and access test results as indicators of first-year performance at university
2004,
The goals set by the National Plan for Higher Education, the fact that many schools...
Statistical properties of indicators of first-year performance at university
Statistical properties of indicators of first-year performance at university
2004,
Appraisal of admission procedures is a matter of urgency for South African...
The construction of drape surfaces with constrained first derivatives
The construction of drape surfaces with constrained first derivatives
2001,
The need to construct optimal drape surfaces arises in airborne geophysical surveys...
Assets, liabilities and risk
Assets, liabilities and risk
2001,
Financial economists and actuaries do not always talk the same language. One...
Unpacking developmental local government using Soft Systems Methodology and MCDA tools
Unpacking developmental local government using Soft Systems Methodology and MCDA tools
2005,
This paper presents two different analytical approaches that may be useful in...
Robustness studies on coal gasification process variables
Robustness studies on coal gasification process variables
2004,
Optimisation of the Sasol-Lurgi gasification process was carried out by utilising the...
A stochastic model for a urea decomposition system
A stochastic model for a urea decomposition system
2005,
Availability is an important measure in describing the performance of a system. The...
Fairness of seat allocation methods in proportional representation
Fairness of seat allocation methods in proportional representation
2005,
In this paper the fairness of some methods of allocating seats in a proportional...
Simulation of fruit pallet movement in the port of Durban: A case study
Simulation of fruit pallet movement in the port of Durban: A case study
2005,
This paper gives an overview of a discrete-event simulation study that was performed...
Efficient heuristics for the rural postman problem
Efficient heuristics for the rural postman problem
2005,
A local search framework for the (undirected) Rural Postman Problem (RPP) is presented...
The rectilinear Steiner ratio
The rectilinear Steiner ratio
2005,
The rectilinear Steiner ratio was shown to be 3/2 by Hwang. We use continuity and...
An algorithm for the minimum of the concave knapsack problem
An algorithm for the minimum of the concave knapsack problem
2005,
This paper addresses the problem of resource allocation among activities where the...
A single product perishing inventory model with demand interaction
A single product perishing inventory model with demand interaction
2004,
The paper describes a single perishing product inventory model in which items...
A two-commodity perishable inventory system
A two-commodity perishable inventory system
2005,
We present a two-commodity perishable stochastic inventory system under continuous...
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