This paper presents a LISP 1.5 program and parts of a protocol analysis that model aspects of the behavior on one adult subject (S) solving a set of Guilford's block visual izat ion problems. The model derives from a detailed analysis of S's thinking aloud protocol on four of these problems. Two problem spaces are postulated to account for S's internal representation of the task. Nine operators...

We address a practical problem faced by many firms. The problem is deciding on the production levels for a product that has a very short selling season. The firm has a full period to produce and meet a lumpy demand which occurs at the end of the period. The product is no longer demanded after the end of the period. A constant production rate which minimizes average unit cost may increase holdin...

In this paper, we use market segmentation approach in multiproduct inventory production system with deteriorating items. The objective is to make use of optimal control theory to solve the production inventory problem and develop an optimal production policy that maximize the total profit associated with inventory and production rate in segmented market. First, we consider a single production a...

The review is an update from the review presented at the OMS-2005 (Chung, 2005). It includes discussions on the technical issues that have been already identified in the literature for manganese nodule production system design and on initial stages of crust mining concepts. It appears no new additional issues have yet been identified and solved. Recent discovery of the buried nodules would nece...

Simulated learner systems are used for many purposes ranging from computational models of learning to teachable agents. To support these varying applications, some simulated learner systems have relied heavily on machine learning to achieve the necessary generality. However, these efforts have resulted in simulated learners that sometimes make generalization errors that the humans they model ne...

The planning of production capacity for a company has been extensively discussed in literature. Seasonal demand of products or seasonal availability of input materials can make the problem even more challenging, as due to a constant need for capacity adjustments. For example, in contrast to conventional chemical processes, the use of biomass has several distinct characteristics like a time depe...

Real time constraints on AI systems require guaranteeing bounds on these systems’ performance. However, in the presence of sources of uncontrolled combinatorics, it is extremely difficult to guarantee such bounds on their performance. In production systems, the .prirnary source of uncontrolled combinatorics is the production match. To eliminate these combinatorics, the unique-attribute formulat...

Most statistical process control (SPC) methods are not suitable for monitoring nonlinear and statedependent processes. This article introduces the context-based SPC (CSPC) methodology for statedependent data generated by a finite-memory source. The key idea of the CSPC is to monitor the statistical attributes of a process by comparing two context trees at any monitoring period of time. The firs...

Forest residue has been proposed as a feasible candidate for cellulosic biofuels. However, the number of studies assessing its water use remains limited. This work aims to analyze the impacts of forest-based biofuel on water resources and quality by using a water footprint approach. A method established here is tailored to the production system, which includes softwood, hardwood, and short-rota...

We consider a problem of minimizing the number of batches of a fixed capacity processing the orders of various sizes on a finite set of items. This batch consolidation problem is motivated by the production system typical in raw material industries in which multiple items can be processed in the same batch in case they share sufficiently close production parameters. If the number of items proce...