Catálogo de publicaciones - libros

Grid can realize the share of computing resource, storage resource, information resource, knowledge resource and expert resource through Internet. Simulation Grid, which integrates grid technology and modeling/simulation technology, will greatly promote the development of SBA (Simulation-Based Acquisition) supporting environment and become an important tool for the modeling and simulation of complex systems. GLOBUS Project is the most representative grid research project and the Simulation Grid Architecture was build on the base of GLOBUS Toolkit so that all kinds of simulation resources can be shared and reused provided as simulation grid services. Implement technique and research status of the Simulation Grid architecture are presented in this paper in detail.

Quality improvement continues to be a major concern in industries. Yet it often takes place without a formal evaluation of the possible expenditures and expected quality improvement target involved. Especially the inspection and rework cost structure and the inspection timing are the major factors to be decided in manufacturing strategies. This paper will propose a computer simulation model for evaluating 3 different manufacturing strategies with regard to inspection and rework cost and the inspection timing in order to implement quality improvement program cost-wise effectively. Computer simulation technique can be used as a decision support aid. Through statistical estimation of specification limits prior to run simulation, we can anticipate the results and validate simulation model as well. The objective of this research is to define and quantify the cost of quality and to demonstrate the use of simulation technique in quality improvement goal-setting with proposed the across-the-board variance reduction technique.

Recently some regulations such as EPR (Extended Producer Responsibilities) have forced companies to develop an interest in recycling systems. In particular, these regulations are focused on the reuse of product materials to resolve environmental disruption or waste disposal. Unfortunately, a large amount of research has been conducted only in the field of mass production, rather than in the automotive disassembly systems that are more likely to have significant opportunities for reuse and recycling. Therefore, it has become necessary to conduct analytic research on systems with the capacity to deal with the annually increasing number of vehicles for disassembly. In this paper, we evaluate four existing vehicle disassembly systems and propose a new and improved alternative disassembly system. We also conduct performance analysis for each system using simulation modeling. Furthermore, we propose 4 alternatives and test their efficiencies in order to improve their performances.

Virtual Manufacturing (VM) is higher computer application in product design and manufacturing and management. Verification of process production planning and control is a basic part in estimation of manufacturing, so layout of virtual factory and simulation will play an important role in VM. Here we consider typical Flexible Manufacturing System(FMS) as studied object and give a detail layout of virtual FMS, whose 3-d geometrical models are originated from a made-in-China 3-D solid CAD software, CAXA. All of the virtual objects of FMS are built according to their functions, propertied and geometrical exterior and assembly them in right position of virtual factory. In order to simulating the dynamical production planning, the consequential control procedure which is on the basis of machining process of each equipment and overall control codes are programmed, which considers transmitted belts as key connection among all of the mounted virtual machining tools and robots, etc. given results show that we can deal with some typical layout and production simulation of virtual FMS.

The paper introduces major technical specifications of the Line II railway simulators of Pusan City in Korea. Comparing design specifications of the railway simulators with those of the light aircraft Flight Training Device (FTD), the paper reveals commonality of implementation technologies applied to both simulators: Overall configurations and design philosophies are basically the same. In both programs VMEbus computing systems with UNIX are adopted as backbones of the simulators. It is found that the railway simulators are less stringent in real-time requirements than the aircraft FTD and the railway simulators are designed to be more event-driven and object-oriented. The experiences show that models may be diverse depending on the objects but implementation technologies are about the same. Maximizing portability of implementation technologies is a matter of an organization’s strategy of adopting standardized processes and modular technologies available and most economic to them.

This paper discusses a landing angle estimation algorithm in UAV (Unmanned Aerial Vehicle) autolanding simulation. In UAV autolanding with radar system, the ground multipath effect and the time varying landing angle make it difficult to estimate landing angle information of UAV. This paper proposed a new algorithm based on forward-backward Kalman filter with time varying forgetting factor. This algorithm effectively handles the multipath effect and time varying landing angle environments to estimate highly accurate landing angle.

A computational model been developed for an axisymmetric ducted fan system to identify its design parameters and their influence on the system performance. The performance of the system has been investigated as its geometrical design parameters, its fan model parameters, and the thrust requirement are changed parametrically. The fan in the system is modeled as an actuator disk, which provides jumps in stagnation enthalpy and stagnation density across it. Current results show that increasing diffuser angle of the duct improves the propulsion efficiency of the ducted fan system, while the inlet geometry has little effect on it. Also, non-uniform fan strength distribution models have been proposed and investigated, which shows that the strength distribution of the fan increasing in the direction of the fan blade tip facilitates wake expansion and requires less power than the fan strength distribution which increases in the direction of the blade hub. The current results are to be validated in near future, when the experimental and computational results are available from parallel research works.

In this paper, we present a new scheme to improve both the flexibility and efficiency of interest management for scaling up distributed interactive simulation. Our approach is explained by describing Area of Interest (AoI) up-date and Degree of Interest (DoI) estimation. We introduce the concept of resolution into the existing spatial model and propose a new relevance model named dynamic resolution spatial model (DRSM). And, a 2-tiered process is presented which based on the proposed model and the existing grid model. Our scheme will enable an interest manager to support various applications and sophisticate strategy for large-scale DIS.

The ROK Armed Forces have developed its own division-level modeling and simulation (M&S) in the quarter century since it started to operate M&S, and achieved success in compliance testing to the international standard High Level Architecture/Run-time Infrastructure (HLA/RTI). This laid the foundation for using the simulation developed by the ROK Armed Forces in combined exercises with the United States. However, it is time to review the M&S standards adopted by the ROK Ministry of National Defense (MND), while various kinds of studies are performed, to enable easy interoperability and reusability between the M&Ss that HLA/RTI aims to develop. Ongoing studies include component-based Model-Driven Architecture (MDA), an Extensible Modeling and Simulation Framework (XMSF) supported by the Defense Modeling and Simulation Office (DMSO), and Intelligent XMSF (I-XMSF), the advanced framework of XMSF. I-XMSF is an architecture in which not only the human operator but also the software agent can play a role as components in the simulation. This paper introduces eXtensible Rule Markup Language for Web Service (XRML-S), the core element for implementation of I-XMSF, and shows how it is integrated into I-XMSF. In addition, the paper presents a way to further develop the M&S of the ROK Armed Forces, which has just begun to really flourish.

This paper presents a new pseudo-exhaustive testing algorithm that is composed of the path sensitization and sub-circuit partitioning using -distribution. In the proposed testing algorithm, the paths, for the path sensitization the, between PIs and POs based on the high (test-mainstay) nodes of CUT(circuit under test) are sensitized and the boundary nodes, for the partitioned sub-circuits, are defined on the level of significance on -distribution respectively. As a consequence, when (1-) is 0.2368, the most suitable of the performance to operate the singular cover and consistency operation in the path sensitization. And when is 0.5217, the most suitable of the performance to partition the sub-circuit in sub-circuit partitioning.