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- Publikacje 1314 wyników po odfiltrowaniu
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Wyniki wyszukiwania dla: urzadzenia mobilne
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Measurements of acoustic crosstalk cancellation efficiency in mobile listening conditions
PublikacjaThe cancellation of acoustic crosstalk is employed to enhance the stereo image in mobile listening conditions. The implementation of the crosstalk cancellation algorithm in Matlab is introduced. The measurement signals and equipment are described. A practical setup employing a mobile computer and a head and torso simulator is employed. The results of the measurements provided conclusions regarding the employment of acoustic crosstalk...
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Dynamic host configuration protocol for IPv6 improvements for mobile nodes
PublikacjaIn wireless networks mobile clients change their physical location, which results in changing point of attachment to the network. Such handovers introduce unwanted periods, when node does not have communication capabilities. Depending on many conditions, such events may require reconfiguration of layer 2 (e.g. IEEE 802.16) or both 2 and 3 layers (IPv6). This paper investigates delays introduced in the latter type of handover. IPv6...
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Auto adaptation of mobile device characteristics to various acoustic conditions
PublikacjaThe proposed methodology of auto adaptation of the mobile device characteristics to various acoustic conditions is presented in the paper. The first goal of this study was to determine the parameters of the acoustic path of the mobile device, for both transmitting (speaker) and receiver (microphone). Results of the measurement of characteristics of mobile devices were presented. Information about characteristics of individual parts...
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A Point Set Connection Problem for Autonomous Mobile Robots in a Grid
PublikacjaConsider an orthogonal grid of streets and avenues in a Manhattan-like city populated by stationary sensor modules at some intersections and mobile robots that can serve as relays of information that the modules exchange, where both module-module and module-robot communication is limited to a straight line of sight within the grid. The robots are oblivious and move asynchronously. We present a distributed algorithm that, given...
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Correction of determined coordinates of railway tracks in mobile satellite measurements
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Mobile Systems (Portable, Handheld, Transportable) for Monitoring Air Pollution
PublikacjaThe monitoring and analysis of atmospheric air pollutants is a rapidly developing branch of analytical chemistry. The in situ analysis of atmospheric air quality using mobile instrumentation is becoming routine. The article provides information on devices used in various kinds of mobile laboratories. It reviews the portable gas chromatographs and handheld devices used for detecting and determining specific harmful substances in...
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Mobile navigation system for visually impaired users in the urban environment
PublikacjaThis paper describes the prototype version of a mobile application supporting independent movement of theblind. Its objective is to improve the quality of life of visually impaired people, providing them with navigationalassistance in urban areas. The authors present the most important modules of the application. The module forprecise positioning using DGPS data from the ASG-EUPOS network as well as enhancements of positioning...
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Quantum strategies for rendezvous and domination tasks on graphs with mobile agents
PublikacjaThis paper explores the application of quantum nonlocality, a renowned and unique phenomenon acknowledged as a valuable resource. Focusing on an alternative application, we demonstrate its quantum advantage for mobile agents engaged in specific distributed tasks without communication. The research addresses the significant challenge of rendezvous on graphs and introduces a distributed task for mobile agents grounded in the graph...
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Using River Formation Dynamics Algorithm in Mobile Robot Navigation
PublikacjaRiver Formation Dynamics is a heuristic optimization algorithm based on the manner, in which drops of water form the river bed. The idea is to imitate the movement of drops on the edges between given nodes thus performing a search based on their height, which is modified through the mechanism of soil erosion and sediment deposition. In this way decreasing gradients are constructed, and these are followed by subsequent drops to...
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Mobile Activity Plan Applications for Behavioral Therapy of Autistic Children
PublikacjaThis paper concerns technological support for behavioral therapy of autistic children. A family of tools dedicated for mobile devices is presented, that allows to design and perform an activity schedule in behavioral therapy. The paper describes the main challenges, that were encountered, especially in meeting the non-functional requirements of the application: simplicity, repeatability, robustness, personalization, re-usability...
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Correction of determined coordinates of railway tracks in mobile satellite measurements
PublikacjaThis article examines one of the basic issues related to the technique of mobile satellite measurements in railway tracks. This problem concerns the correction of the determined coordinates of the track centerline. The need to perform this operation results from the GNSS receivers positioning at a certain height above the level of the existing track axis, leading to longitudinal and lateral shifts of antennas. The key problem here...
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A Review of Traffic Analysis Attacks and Countermeasures in Mobile Agents' Networks
PublikacjaFor traditional, message-based communication, traffic analysis has been already studied for over three decades and during that time various attacks have been recognised. As far as mobile agents’ networks are concerned only a few, specific-scope studies have been conducted. This leaves a gap that needs to be addressed as nowadays, in the era of Big Data, the Internet of Things, Smart Infrastructures and growing concerns for privacy,...
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Modelling and Analysis of the Positioning Accuracy in the Loading Systems of Mobile Cranes
PublikacjaIn this work, the authors analyse the influence of the order and range of sequential movements of a crane's working members on the accuracy of the final cargo positioning. The analysis was conducted on the basis of a specially developed method in which the authors proposed the introduction of a geometrical indicator of positioning the load in the intermediate positions (after completing each movement sequence) and in the target...
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Evaluation of Street Lighting Efficiency Using a Mobile Measurement System
PublikacjaThe issue concerns the initial stage of work on a method for performing a rapid assessment of the energy efficiency and illuminance of a street lighting installation. The proposed method is based on simultaneous measurement of illuminance from three lux meters placed on the roof of the vehicle. The data are acquired in road traffic, while the vehicle is driving. The proposed solution will allow in the future to quickly and reproducibly...
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Investigation method of large-volume tire with mobile test rig
PublikacjaThe goal of this research is to develop the tire test method and mobile tire test rig. The test rig enables measurement of tire properties as stiffness and viscous damping in vertical direction, and tire–ground characteristics on the asphalt rigid surface. The tire-ground characteristics are measured by force and a torque measurement hub. The design, calibration and the algorithm for calculating the forces in the wheel center are...
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Music genre classification applied to bass enhancement for mobile technology
PublikacjaThe aim of this paper is to present a novel approach to the Virtual Bass Synthesis (VBS) algorithms applied to portable computers. The proposed algorithm is related to intelligent, rule-based setting of synthesis parameters according to music genre of an audio excerpt. The classification of music genres is automatically executed employing MPEG 7 parameters and the Principal Component Analysis method applied to reduce information...
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Problemy moralne w sprzedaży bezpośredniej
PublikacjaAutorzy uściślają szerokie i węższe ujęcie definicyjne sprzedaży bezpośredniej, jako formy handlowania. Następnie przedstawiają problemy moralne, spotykane w tego typu sprzedaży. Problemy te zostały uszeregowane w zależności od relacji pomiędzy podmiotami transakcji.
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MobileNet family tailored for Raspberry Pi
PublikacjaWith the advances in systems-on-a-chip technologies, there is a growing demand to deploy intelligent vision systems on low-cost microcomputers. To address this challenge, much of the recent research has focused on reducing the model size and computational complexity of contemporary convolutional neural networks (CNNs). The state-of-the-art lightweight CNN is MobileNetV3. However, it was designed to achieve a good trade-off between...
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Projekt i budowa urządzenia wspomagającego oddychanie w czasie snu u osób cierpiących na bezdech senny
PublikacjaPraca ta koncentruje się na realizacji projektu i budowy urządzenia wspomagającego oddychanie w czasie snu u osób cierpiących na bezdech senny. Wynikiem przeprowadzonych analiz zapisów sygnałów fizjologicznych, pomierzonych w czasie nocnych badań polisomnograficznych, jest autorski algorytm sterowania prototypem aparatu. W tej pracy została równieŜ przedstawiona propozycja rozwiązania problemów: wczesnego wykrywania zbliŜających...
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Weryfikacja odwzorowania kształtów i wymiarów podzespołów płaskich, wycinanych w technologii elektrodrążenia urządzenia wspomagającegozrobotyzowane narzędzia laparoskopowe
PublikacjaW pracy zaprezentowano analizę poprawności wykonaniapodzespołów urządzenia będącego zrobotyzowanym mikronadgarstkiem,wykorzystywanym dla zwiększenia ruchliwości narzędzilaparoskopowych o średnicy 2,5 mm. Analizowane podzespoły wykonanesą w skali 7:1 w technologii elektrodrążenia drutem o średnicy50 mm. Charakteryzują się architekturą płaską o określonej głębokościi skomplikowanym kształcie w pozostałych dwóch wymiarach. Analiziepoddano...
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Sterowanie optymalne ruchem platformy mobilnej przy energetycznym wskaźniku jakości
PublikacjaW pracy przedstawiono metodę sterowania optymalnego platformą mobilną przy uzmiennionym w czasie energetycznym wskaźniku jakości. Parametry ruchu wyznaczane są z zadania odwrotnego kinematyki. Uruchomiono autorskie programy symulacyjne. Proponowany układ sterowania minimalizuje błędy zadanego położenia oraz błędy w przebiegach prędkości uogólnionych.
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Metoda lokalizowania sensorów IoT przy użyciu mobilnej stacji bazowej
PublikacjaW artykule opisano innowacyjną metodę lokalizowania obiektów dla potrzeb Internetu rzeczy (IoT). Przedstawiono matematyczną analizę metody. Opisano również wyniki kompleksowych badań symulacyjnych efektywności pracy zaproponowanej metody dla wybranych parametrów radiowej sieci sensorowej.
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Urządzenie wspomagające automatyczne badanie perymatryczne poprzez kontrolę punktu fiksacji oka - praca dyplomowa
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Przenośny analizator stężeń gazów toksycznych jako urządzenie działające w rozproszonym systemie pomiarowym
PublikacjaW artykule opisano koncepcję przenośnego analizatora stężeń gazów toksycznych, który został zrealizowany jako urządzenie przystosowane do pracy w systemie rozproszonym. Przenośny analizator stężeń gazów toksycznych wykorzystując rozwiązania stosowane w nowoczesnych systemach pomiarowych realizuje pomiar odpowiedzi czujników gazu oraz umożliwia prezentację, archiwizację i analizę pomierzonych wielkości.
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Urządzenie do wytwarzania gazowych mieszanin wzorcowych z wykorzystaniem procesu barbotażu oraz permeacji
PublikacjaReference gas mixtures are classified to reference materials and are mainly used for quality monitoring and identification of impurities in atmospheric air. They can be also used for calibration of measuring devices. Nowadays, there is a need to develop a new techniques for the preparation of reference gas mixtures [1, 2]. In this paper the design and the operating principles of instrument based on the use of barbotage and permeation...
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Piotr Kurgan dr inż.
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Investigation of OSL signal of resistors from mobile phones for accidental dosimetry
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Performance analysis of untraceability protocols for mobile agents using an adaptable framework
PublikacjaArtykuł przedstawia środowisko oceny wydajności protokołów ochrony przed tropieniem agentów mobilnych oraz wyniki analiz przeprowadzonych za jego pomocą. Chociaż środowisko projektowano i implementowano z myślą o ewaluacji zaproponowanych przez nas protokołów ochrony przed tropieniem, w trakcie badań okazało się, że może ono zostać również wykorzystane do badań całej klasy protokołów bezpieczeństwa dla agentów mobilnych. Chodzi...
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Distributed MIND - A New Processing Model Based on Mobile Interactive Documents
PublikacjaObliczenia w trybie zespołowym pozwalają na integrację działań ludzi i agentów systemowych w otwartym środowisku rozproszonym w celu rozwiązywania problemów formułowanych dynamicznie w trakcie pracy systemu. Problemy te najczęściej nie mają charakteru algorytmicznego, tzn. generowane rozwiązania nie mogłyby zostać wyliczone w skończonej liczbie kroków na podstawie danych charakteryzujących uczestników obliczeń. Autorzy proponują...
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A navigation device utilizing body communication channel for mobile wearable systems
PublikacjaA novel touch sensor utilizing a body communication technology is presented in the paper. The proposed device accepts orders (gestures) only from a person wearing it. Moreover, when comparing it to a similar, however an optical one, it appears as a less power consumable. Preliminary results of its properties examination are presented and discussed. Additionally, the developed sensor allows to measure a human body the electrical...
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Three-wheeled mobile platform powered by LabVIEW at energy performance index
PublikacjaW pracy opisano trójkołową platformę mobilną własnej konstrukcji, zbudowaną i kontrolowaną z wykorzystaniem środowiska LabVIEW. W celu realizacji ruchu platformy oraz zapewnienia jego nadzorowania w czasie rzeczywistym, zastosowano sterownik NI cRIO. Zastosowane równolegle techniki projektowania mechatronicznego, tj. wirtualne prototypowanie, symulacje w trybie HILS oraz szybkie prototypowanie na obiekcie docelowym, umożliwiły...
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Mobile operators at war: opinion mining and sentiment analysis on social media
PublikacjaConsidering hermetic and very competitive market such as mobile operator ones, social media has become best alternative for contact with customer and gathering data and opinions. Different style of running social media profiles is giving different results. The research presented in this paper aims to show the number of responses gathered from polish Internet users and its sentiment for mobile operator brands. It also presents practical...
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Study of data scheduling methods in the WiMAX Mobile metropolitan area networks
PublikacjaThe paper discusses basic assumptions of the WiMAX Mobile system. It also presents and analyses the results of simulation tests run for selected data scheduling methods and subcarrier allocation. Based on the test results, the authors have prepared a comparative analysis of two popular data scheduling methods, i.e. WRR and PF, and their own method CDFQ which uses information about the current channel situation for the queuing processes...
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Determining horizontal curvature of railway track axis in mobile satellite measurements
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Installation of GNSS receivers on a mobile railway platform – methodology and measurement aspects
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Airborne and mobile laser scanning in measurements of sea cliffs on the southern Baltic
PublikacjaMeasurements of sea cliffs performed using periodic surveying based on laser scanning is currently one of the fastest and most accurate solutions. Supported with the technology of satellite measurements using GNSS (Global Navigation Satellite System) positioning and photographic measurements with the use of aerial vehicle, they enable an effective monitoring of the sea cliffs affected by the erosion. In case of the coast of southern...
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Badanie sprawności algorytmów szeregowania danych w systemie WiMAX Mobile
PublikacjaW pracy przedstawiono wyniki badań symulacyj-nych różnych metod szeregowania danych i przydziału podnośnych w sieciach opartych na standardzie IEEE 802.16e (WiMAX Mobile). W pracy zostały opisane najważniejsze mechanizmy odpowiedzialne za zarządza-nie jakością usług w tych sieciach. Analizę porównaw-czą przeprowadzono dla następujących metod: Round Robin (RR), Proportional Fairness (PF) oraz Maximum Rate (MR). Znaczną uwagę poświęcono...
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Design of control algorithms for mobile robots in an environment with static and dynamic obstacles
PublikacjaThis article proposes the construction of autonomous mobile robots and designing of obstacle avoidance algorithms for them. Nowadays, mobile robots are gaining more and more popularity on the customer as well as industrial market, for example as automatic vacuum cleaners or lawnmowers. Obstacle avoidance algorithms play an important role in performance of this types of robots. The proposed algorithms were designed for builds with...
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An Empirical Propagation Model for Mobile Radio Links in Container Terminal Environment
PublikacjaIn this paper, a novel empirical propagation model for mobile radio links in a container terminal environment is presented. Measurement propagation research carried out in the Deepwater Container Terminal (DCT) in Gdańsk, Poland is described, and the investigated environment is characterized. The results of the statistical evaluation of the new model are discussed. In addition, statistical tuning of the Walfisch–Ikegami model for...
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A new approach of coastal cliff monitoring using Mobile Laser Scanning
PublikacjaThe article proposes a new approach of coastal cliff monitoring which bases on a new comprehensive monitoring system, being a combination of mobile scanning from the sea with the geotechnical stability analysis. Mobile laser scanning is an innovative solution for 3D data collection which allows the monitored object geometry to be precisely measured, thus providing opportunities for series of analyses contributing to the development...
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Optimal control of 2-wheeled mobile robot at energy performance index
PublikacjaThe paper presents the application of the optimal control method at the energy perfor- mance index towards motion control of the 2-wheeled mobile robot. With the use of the proposed method of control the 2-wheeled mobile robot can realise effectively the desired trajectory. The problem of motion control of mobile robots is usually neglected and thus performance of the realisation of the high level control tasks is limited.
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Installation of GNSS receivers on a mobile railway platform – methodology and measurement aspects
PublikacjaDetermining the course of a railway track axis using satellite methods relies on ensuring the precise assembly of GNSS receivers in dedicated measuring devices. Depending on the number of receivers, solutions that are based on placing the apparatus directly above the railway track axis (as well as in eccentric positions) are used to indirectly obtain data to form the basis of the desired results. This publication describes the...
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Sensor Position Estimation Method for IoT Using Mobile Reference Node
PublikacjaThe paper proposes an innovative method of locating objects for the Internet of Things (IoT). The proposed method allows the position of a fixed measuring sensor (MS) to be estimated using one mobile base station with a known position moving around the MS. The mathematical analysis of the method, and three algorithms — Newton’s (NA), gradient descent (GD) and genetic (GA) — for solving the system of non-linear positional equations...
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Mobile Gas Chromatographs Coupled with Mass and Ion Mobility Spectrometers and their Applications
PublikacjaThe articles describes the developments un combining of mass and ion mobility spectrometers (MS, IMS0 with miniature gas chromatographs (GC). The examples of applications of miniaturised GC-MS and GC-IMS devices are presented.
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Determining horizontal curvature of railway track axis in mobile satellite measurements
PublikacjaThe article discusses the applicability of a novel method to determine horizontal curvature of the railway track axis based on results of mobile satellite measurements. The method is based on inclination angle changes of a moving chord in the Cartesian coordinate system. In the presented case, the variant referred to as the method of two virtual chords is applied which consists in manoeuvring with only one GNSS (Global Navigation...
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Study on the prevalence of mobile phone use by car drivers – the case of Poland
Publikacja: Distracted driving is a significant factor affecting road safety and it can occur as a result of using mobile phones while driving. The aim of the current research is to present the prevalence of mobile phone use by Polish car drivers, based on the roadside and online survey. The field study showed that 11.6% of 1867 drivers were using mobile phones while being in motion and 26.1% of 203 drivers when stopped in front of traffic...
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A mobile loop order–disorder transition modulates the speed of chaperonin cycling
PublikacjaMolecular machines order and disorder polypeptides as they form and dissolve large intermolecular interfaces, but the biological significance of coupled ordering and binding has been established in few, if any, macromolecular systems. The ordering and binding of GroES co-chaperonin mobile loops accompany an ATP-dependent conformational change in the GroEL chaperonin that promotes client protein folding. Following ATP hydrolysis,...
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Study on VR Application Efficiency of Selected Android OS Mobile Devices
PublikacjaCurrently, the number of scenarios for using VR (Virtual Reality) technology grows every year. Yet, there are still issues associated with it, related with the performance of the mobile device itself. The aim of this work is to perform an analysis of the effectiveness of virtual reality applications in case of mobile platforms. We put the main emphasis on examining the performance and efficiency of four different hardware and software...
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Analysis of the possibilities in railways shape assessing using GNSS mobile measurements
PublikacjaIn recent years, a dynamic development of satellite positioning techniques using both static and mobile GNSS coordinates register mode can be observed. In addition, still developing Real-time GNSS Networks, post-processing algorithms and another measurement signal analysis algorithms, make the satellite measurements increasingly used in railway industry sector. In the article the possibilities which follows from the mobile satellite...
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Evaluating the Internal and External Usability of Mobile Technologies in Facilitating Knowledge Transfer
PublikacjaA worker’s performance and productivity depend on a variety of factors including knowledge, to be essential for self-effectiveness and self-efficacy. In the literature, knowledge transfer is argued to enhance the quality of work, and therefore, its value. When addressing this issue, the latest studies have considered and evaluated the use of mobile technologies, which are evidenced to improve a worker’s capacity and skills. However,...