Accuracy and precision of leaf positioning in multileaf collimators (MLCs) are significant factors for the accuracy of IMRT treatments. This study aimed to inves-tigate the accuracy and repeatability of the MLC leaf positioning via the DAVID invivo dosimetric system for dynamic and static MLC systems. The DAVID system was designed as multiwire transmission ionization chamber which is placed in ...

The pseudolite system is a good alternative for indoor positioning systems due to its large coverage area and accurate positioning solution. However, for common Global Positioning System (GPS) receivers, the pseudolite system requires some modifications of the user terminals. To solve the problem, this paper proposes a new pseudolite-based indoor positioning system architecture. The main idea i...

A robust positioning control scheme has been developed using friction parameter observer and recurrent fuzzy neural networks based on the sliding mode control. As a dynamic friction model, the LuGre model is adopted for handling friction compensation because it has been known to capture sufficiently the properties of a nonlinear dynamic friction. A developed friction parameter observer has a si...

One of the most important approaches in the scientific research concerning the increase of the positioning accuracy is the use of parallel structures. Parallel kinematic structures have a series of advantages that makes them adequate for the mini-robots construction: actuator positioning on the seating, miniaturization, stiffness, positioning precision and repeatability, actuators separation fr...

Location-aware applications for supporting the mobile user require reliable information about their position and the environment. Based on a critical review of solutions so far, a very cost effective solution of a local positioning system (LPS) is introduced for the need of positioning indoors as well as on a constrained outdoor campus with dynamic granularity. The simple and costeffective hybr...

A program for assembling sequences by using a global approach has been developed. By successive steps, a more and more precise classification of DNA fragments permits the positioning of the sequences on the contig; after having detected the pairs of overlapping sequences, groups are formed such that all sequences in a group overlap. Sequences common to several groups enable the groups to be ord...

The long-term goal of this research is to identify the dominant mechanisms that control the dynamic tension in submerged cables. This goal addresses the need to suppress or alleviate the dynamic component of cable tension that may adversely affect the performance of underwater cables and any mission they are used to support. For instance, large dynamic tension forces may degrade the positioning...

The metals segment differs from other sectors in its strong dependence upon exploration and acquisition of the best ore bodies and in its greater globalization of operations. Metals producers thus spoke the most about international technology trends and lessons to be gained from abroad. Despite present low metals prices, product demand remains high, and hence increasing productivity and lowerin...