FIR Filter Design Using Distributed Maximal Flatness Method

In the paper a novel method for filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the method used to design the most common FIR fractional delay filter – the maximally flat filter. The MF filter demonstrates excellent performance but only in a relatively narrow frequency range around zero frequency but its magnitude response is no greater than one. This ,,passiveness” is the reason why despite of its narrow band of accurate approximation, the maximally flat filter is widely used in applications in which the adjustable delay is required in feedback loop. In the proposed method the maximal flatness conditions forced in standard approach at zero frequency are spread over the desired band of interest. In the result FIR filters are designed with width of the approximation band adjusted according to needs of the designer. Moreover a weighting function can be applied to the error function allowing for designs differing in error characteristics. Apart from the design of fractional delay filters the method is presented on the example of differentiator, raised cosine and square root raised cosine FIR filters. Additionally, the proposed method can be readily adapted for variable fractional delay filter design regardless of the filter type.

Morfologia złamań kości piętowej w obrazach tomografii komputerowej : analiza materiału własnego

Background: The purpose of this paper is a description of calcaneal fracture morphologies on CT scans, specially inta-articular fractures divided according to the Sanders classification. Material/Methods: Computerized tomography was used to evaluate 55 fractures of the calcaneus treated at the Orthopedic and Traumatology Department in Wejherowo from July 2001 to November 2003. For treatment planning, the Sanders classification based on CT was developed. Results: CT scans showed extra-articular fractures of the calcaneus in 5 cases (91%) and intra-articular fractures in 50 cases (91%). According to the Sanders classification, type I was found in 2 cases (4%), type II in 26 cases (47%), type III in 17 cases (31%), and type IV in 5 cases (9%). Conclusions: On the base of this study we conclude that computerized tomography is a good diagnostic method in calcaneal fractures. Analysis of the CT scans showed their specific, repeated morphology. The Sanders classification is very useful in treatment planning and has prognostic value

Streaming Real-time Data in Distributed Dispatcher and Teleinformation Systems for Visualization of Multimedia Data of the Border Guard

Surveillance of the sea borders is a very important task for the Border Guard. Monitoring of country maritime border is an important task of the Border Guard. This task can be facilitated with the use of the technology enabling gathering information from distributed sources and its supervision and visualization. This task can be accomplished using a technology that allows to collect information from distributed sensors of different types, unify the collected information, and present the synchronized data. The system presented in the paper is an extension and enhancement of the previously developed distributed map data exchange system. The added functionality allows to supplement the map data with multimedia (telephone and radio calls, video (cameras), photos, files, SMS/SDS) and presentation of current and archival situation on a multi-display screen in the Events Visualization Post. In the paper, the system architecture, functionality and main system elements are described and supported with preliminary analysis and test results

Global disk model for galaxies NGC 1365, NGC 6946, NGC 7793, UGC 6446

Spiral galaxies are studied using a simple global disc model as a means for approximate determination of mass profiles. Based on rotation curves and the amount of gas (HI+He), we find global surface mass densities consistent with measurements and compare them with B-band surface brightness profiles. As a result we obtain mass-to-light ratio profiles. We give some arguments for why our approach is reliable and sometimes better than those assuming ad hoc the presence of a massive non-baryonic dark matter halo. Using this model, we study galaxies NGC 7793, 1365, 6946 and UGC 6446. Based on a rotation curve from The HI Nearby Galaxy Survey (THINGS) we also study galaxy NGC 4536 and compare the results with those we published elsewhere for the same galaxy.Comment: 12 pages, 11 figure

Mapserver – Information Flow Management Software for The Border Guard Distributed Data Exchange System

In this paper the architecture of the software designed for management of position and identification data of floating and flying objects in Maritime areas controlled by Polish Border Guard is presented. The software was designed for managing information stored in a distributed system with two variants of the software, one for a mobile device installed on a vessel, an airplane or a car and second for a central server. The details of implementation of all functionalities of the MapServer in both, mobile and central, versions are briefly presented on the basis of information flow diagrams