112103084
Using simulation generators for modeling flexible manufacturing systems
32884753
Expert Simulation For On-line Scheduling
In recent years, the automotive industry has realized the importance of speed of new products to market and has mounted efforts for improving it. The Expert System Scheduler (ESS) facilitates these efforts by enabling manufacturing plants to generate viable schedules under increasing constraints and demands for flexibility. The scheduler takes advantage of the Computer Integrated Manufacturing (CIM) environment by utilizing the real-time information from the factory for responsive scheduling. The Expert System Scheduler uses heuristics developed by an experiences factory scheduler. It uses simulation concepts and these heuristics to generate schedules. Forward and "backward" simulation are used at different stages of the schedule generation process. The system is used to control parts flow on the factory floor at one automated facility. This highly automated facility is a testbed for implementation of CIM concepts. The scheduler runs on a Texas Instruments (TI) Explorer II computer using software developed inhouse utilizing IntelliCorp's Knowledge Engineering Environment (KEE) shell and the LISP language. The scheduling computer is networked to the factory control computer, which actually controls the plant floor. The TI Explorer II acquires current plant floor information from the factory control system, generates a new schedule and sends it back within a short time. The configuration allows fast response to changes in requirements and plant floor conditions.
7194511
A Concept Prototype for Integrated Gaming and Simulation for Incident Management
This paper describes a prototype that has been developed to demonstrate the concept of integrated gaming and simulation for incident management. An architecture for the purpose was developed and presented at the last conference. A hypothetical emergency incident scenario has been developed for demonstrating the applicability of integrated simulation and gaming. A number of simulation and gaming modules have been utilized to model the major aspects of the hypothetical scenario. The modules demonstrate the value of utilizing simulation for incident management applications. They can be used to highlight the value of simulation and gaming for training applications in particular. Two of the simulation modules have been integrated using a modified implementation of the high level architecture to give an idea of the advantages. Technical issues in integration are identified
201885623
Manufacturing supply chain applications: modeling computer assembly operations for supply chain integration
Factory operations have been modeled for years to understand the relationship between the different design and policy factors and the performance measures of interest. The increasing awareness of the need to manage factories as a link in the supply chain places a corresponding requirement for an enhanced approach for factory modeling. This paper describes the modeling of a computer assembly factory for supply chain integration by including aspects of inbound and outbound logistics and relevant business processes. Lessons are drawn based on the experience.
6477912
Stress testing a supply chain using simulation
Simulation provides the capability to evaluate performance of a system operating under current or proposed configurations, policies and procedures. It is very applicable to evaluation of strategic and operational level plans for supply chains. It is especially useful for exploring the viability of a supply chain before beginning production. This paper describes the use of simulation for determining the readiness of a supply chain designed by a small company for providing sub-systems to a defense contractor. The supply chain had to be stress tested at surge and mobilization volume levels to meet the requirements. Simulation provided the ideal methodology to identify and demonstrate the behavior of the supply chain under stress and evaluate strategies to meet the defined volumes. It was used to prove the readiness of the supply chain reducing perceived risks in using the virtual operation.
5859647
Simulation in the next millennium
The paper looks into the future of simulation. The capabilities and features of simulation software of the future are hypothesized, focusing on the major aspects of their use. The features addressed include model building, visualization, output analysis and optimization, integration and the Internet. The discussion of simulation software in the future is closely related to the vision of future applications of simulation. Applications of simulation in the near term future are proposed using examples of advanced applications that are in conceptual stages at present. Applications of simulation in the long term future are also proposed, bordering on science fiction.
10759876
A Polynomial Time Learner for a Subclass of Regular Patterns
Presented is an algorithm (for learning a subclass of erasing regular pattern languages) which can be made to run with arbitrarily high probability of success on extended regular languages generated by patterns of the form x0 1x1::: mxm for unknown m but known c , from number of examples polynomial in m (and exponential in c ), where x0; : : : ; xm are variables and where 1; :::; m are each strings of terminals of length c . This assumes that the algorithm randomly draws samples with natural and plausible assumptions on the distribution. With the aim of nding a better algorithm, we also explore computer simulations of a heuristic.
11269317
On an open problem in classification of languages
Smith, Wichagen and Zeugmann (1997) showed an interesting connection between learning with bounded number of mind changes from informants and classification from informant. They showed that if an indexed family of languages L is learnable via informants, using at most m mind changes, then one can partition 2 N , the class of all languages, into m + 2 subclasses L 1,…,L m + 2.
16360667
On some open problems in reflective inductive inference
In this paper we show that there exist classes of functions which can be learnt by a finite learner which reflects on its capability, but not learnable by a consistent learner which optimistically reflects on its capability. This solves the two mentioned open problems from [G. Grieser, Reflective inductive inference of recursive functions, Theoretical Computer Science A 397 (1-3) (2008) 57-69 (Special Issue on Forty Years of Inductive Inference. Dedicated to the 60th Birthday of Rolf Wiehagen)].
16015083
Learning languages in a union
In inductive inference, a machine is given words of a language (a recursively enumerable set in our setting) and the machine is said to identify the language if it correctly names the language. In this paper we study identifiability of classes of languages where the unions of up to a fixed number (n say) of languages from the class are provided as input. We distinguish between two different scenarios: in one scenario, the learner need only to name the language which results from the union; in the other, the learner must individually name the languages which make up the union (we say that the unioned language is discerningly identified). We define three kinds of identification criteria based on this and by the use of some classes of disjoint languages, demonstrate that the inferring power of each of these identification criterion decreases as we increase the number of languages allowed in the union, thus resulting in an infinite hierarchy for each identification criterion. That is, we show that for each n, there exists a class of disjoint languages where all unions of up to n languages from this class can be discerningly identified, but there is no learner which identifies every union of n+1 languages from this class. A comparison between the different identification criteria also yielded similar hierarchies. We give sufficient conditions for classes of languages where the unions can be discerningly identified, and characterize such discerning learnability for the indexed families. We then give naturally occurring classes of languages that witness some of the earlier hierarchical results. Finally, we present language classes which are complete with respect to weak reduction (in terms of intrinsic complexity) for our identification criteria.
15285205
Program Synthesis in the Presence of Infinite Number of Inaccuracies
Most studies modeling inaccurate data in Gold style learning consider cases in which the number of inaccuracies is finite. The present paper argues that this approach is not reasonable for modeling inaccuracies in concepts that are infinite in nature (for example, graphs of computable functions).