PURPOSE To evaluate whether a combination of penetrating keratoplasty (PKP) or pars plana vitrectomy (PPV) and Ahmed glaucoma valve (AGV) implantation affords a level of success similar to that of AGV implantation alone. METHODS Eighteen eyes underwent simultaneous PPV and AGV, 14 eyes with PKP and AGV and 30 eyes with AGV implantation alone were evaluated. Success was defined as attainment o...

Abstract : A tandem automated guided vehicle (AGV) system deals with grouping workstations into some non-overlapping zones , and assigning exactly one AGV to each zone. This paper presents a new non-linear integer mathematical model to group n machines into N loops that minimizes both inter and intra-loop flows simultaneously. Due to computational difficulties of exact methods in solving our pr...

To solve the problems of task scheduling and coordination control presented by a multi-AGV system, the mixed regional control model for the production task has been advanced. The architecture of multi-AGV task assignment and scheduling mechanism has been proposed by combining the mixed regional control model for the production task and the neuro-endocrine coordination mechanism. Hormones for ma...

In multi AGV (Automatic Guided Vehicle) system, the core problem is how to plan a collision free path for each AGV, to solve the conflict between AGV and ensure the path of the path is not only the premise of path planning, but also the basis of the effectiveness of the task scheduling, so for the study of AGV system, multi AGV collision problem is also the research’s hotspot and difficult prob...

1 Suthep Butdee, Thai French Innovation Center, King Mongkut’s Institute of Technology North, Bangkok, 1518 Piboonsongkram Rd. Bangsue, Bangkok, Thailand 10800, [email protected] 2 Anan Suebsomran, Department of Teacher Training in Mechanical Engineering, Faculty of Technical and Education, King Mongkut’s Institute of Technology North Bangkok, 1518 Piboonsongkram Rd. Bangsue, Bangkok, Thailand 1...

We describe parallel simulations of an Automated Guided Vehicle (AGV) system for the container handling at a port. The AGV system is modelled with a time-driven approach and executed on efficient simulation engines implemented by using Cilk, a multi-threaded parallel programming language developed at MIT. The speedup results of the AGV simulation over sequential versions are documented. We also...

Multi-load Automated Guided Vehicle's (AGV) are regarded as a potential tool to tackle the low-efficiency issue that have plagued traditional single-load AGV systems for many years. However, date, optimal design and operation of multi-load is still an unresolved question. In order explore answer this question help operators make decisions during these systems, article will use Coloured Petri ne...

The development of techniques for lateral and longitudinal control of vehicles has become an important and active research topic in the face of emerging markets for advanced autonomous guided vehicle (AGV). Considering an AGV is nonholonomic dynamic system with inherent nonlinearity, unmodelled disturbance and unstructured unmodelled dynamics, fuzzy logic system based control is appropriate. Th...

The study objectives are to 1) provide information regarding the use and benefits of Automated Guided Vehicle (AGV) systems in manufacturing environments, and 2) review the literature related to design, modeling and simulation of AGV systems. We classify the tools utilized in design problems of AGV systems as analytical and simulation-based tools. Then, give examples of both categories from rel...

In this paper, we study the design and control of automated guided vehicle (AGV) systems, with the focus on the quayside container transport in an automated container terminal. We first set up an event-driven model for an AGV system in the zone control framework. Then a number of layouts of the road network (guide-path) are carefully designed for the workspace of the AGVs in a container termina...