Showing papers in "Acta Polytechnica Hungarica in 2011"

Application of pseudo-analysis in the synchronization of container terminal equipment operation

Abstract: Based on the global increase in the volume of containerized goods, there is an emerging need for analysis and improvement in all aspects of the logistic chain of container transport. Mathematical description of equipment operation in container terminal is of key importance for understanding complex container terminals. This paper presents an innovative concept in the modeling of a container reloading operation inside a container terminal and its equipment based on pseudo-analysis in the form of max-plus semiring. The presented synchronization of the equipment operation (quay container cranes and automated guided vehicles, shortly AGV) during container unloading leads to minimization of the required number of automated guided vehicles. The presented method is demonstrated in a numerical example.

Historical Origin of the Fine Structure Constant Part III: Pauli with Jung Retro-Cognizes St. Stephen's Crowning Achievement

Abstract: In Part II of the paper we discussed the central role of the number-archetype 137 in some great medieval works related to St Stephen"s court. On the basis of the hermeneutical interpretation of certain of Pauli"s famous dream series, we intend to show his hypothetical "synchronistic (unconscious) recognition" of the dominant representations and meanings of the medieval works discussed in the earlier parts of this paper, which can be related to his isomorphic mythological and "physical" dream patterns. We can also conclude that Pauli, collaborating with Jung, himself confirms in his consistent "dream- messages" the symbolic meaningful relationship and structural isomorphy between the basic quantum-physical model"s features (e.g. the fine structure constant) and their hypothetical primordial images appearing even in the actual medieval works.

A computational framework for a bio-inspired mechanism of vernier hyperacuity

Abstract: In this paper, we present a bio-inspired computational framework for the hypothetical cooperation of the ocular drift and a place coding neural circuitry. The proposed bio-inspired mechanism can provide an explanation for the ability of primate vernier hyperacuity. Our starting point is a spatiotemporal model of the primate retinal P and M ganglion cells. First we show that in the central retina, the drift-induced movement moves the stimuli of preferred spatial frequency with a velocity that is optimal for P cells and almost \"invisible\" for the movement-sensitive M cells. Secondly, based on a presumed analogy between the owl's auditory system and a primate visual system we present a theory that visual hyperacuity can be originated to the detection of time delays between neural firing patterns. Third, we propose a possible neural model for the place coding circuitry. Our new theory may serve suggestions for further research.

Model Reference Fuzzy Control of Nonlinear Dynamical Systems Using an Optimal Observer

Abstract: This paper proposes a novel indirect model reference fuzzy control approach for nonlinear systems, expressed in the form of a Takagi Sugeno (TS) fuzzy model based on an optimal observer. In contrast to what is seen in the literature on adaptive observer-based TS fuzzy control systems, the proposed method is capable of tracking a reference signal rather than just regulation. Additionally the proposed algorithm benefits from an adaptation algorithm which estimates the parameters of observer optimally. The stability analysis of the adaptation law and the controller is done using an appropriate Lyapunov function. The proposed method is then simulated on the control of Chua's circuit and it is shown that it is capable of controlling this chaotic system with high performance.

General Solution for the Self-Organizing, Distributed, Real-Time Scheduling of FMS- Automatic Lot-Streaming Using Hybrid Dynamical Systems

Abstract: The use of hybrid dynamical systems opens a new horizon for flexible manufacturing systems scheduling. It even makes possible directly connect scheduling and MRP. In the present paper the most important new result is the proposed demand rates determination method for multi-section scheduling problems. Some other important achievements making possible the application of this approach are discussed,too. These are, for example:  feedback control law resulting in stable (implementable with finite buffers) and regular (converging to periodic) processes is described;  optimal demand rates determination for single- section problems is discussed. In this paper the "buffer principle" of planning is used and a bottleneck scheduling approach is applied. As the result, production times close to the global minimum of net manufacturing time, determined by the loading characteristics of bottleneck machine- groups, may be realized. The proposed control is totally self-organizing. No outside control commands are necessary. Every buffer is only connected (in the signal level) with the previous and the next buffer. The actions are real-time controlled. The most important feature of this control is that it significantly improves the efficiency of utilization of system resources.The generalization for multi-section problems makes it possible to solve the most common application tasks. Ev, the solution of dynamical input problems becomes possible.

On the Support of the Resultant Vector of d'Alembert's Fictitious Forces for Bars and Plates in Rotation Motion

Abstract: This paper presents the determination of the central axis of d'Alembert's fictitious forces system for plane bars and plates in uniform rotation motion around an axis in their plane. General cases of bars and plates are studied. A general law for the determination of the support of the resultant vector of d'Alembert's fictitious forces is established. This law is based on the position of the center of mass of the rotation surface and body generated by the bar and the plate in rotation, respectively.