2017 - Repozytorium publikacji - Politechnika Gdańska

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SEMANTIC ANALYSIS ALGORITHMS FOR KNOWLEDGE WORKERS SUPPORT
- Nina Rizun
- Mariia Rizun
- Jurij Taranenko
2017 Pełny tekst
The paper examines various aspects of text analysis application for knowledge worker’s activity realization. Conclusions are drawn about the relevance and importance of processing the non-structured textual information in order to increase knowledge worker’s efficiency, as well as their awareness in different branches of science. The paper considers the existing algorithms of texts semantic analysis as the sphere of documents topical closeness recognition. At the same time, it contains an example of applying the complex methodology of semantic analysis, which includes LSA and LDA methods together with the Zipf’s Law with the objective to solve a typical knowledge worker’s task. Quantitative identifiers of the efficiency of this methodology are given.
Seminarium Baltazar Open Days
- Mikołaj Miśkiewicz
2017 Materiały Budowlane
Artykuł syntetycznie przedstawia zagadnienia poruszone podczas seminarium dotyczącego konstrukcji kompozytowych Baltazar Open Days 2016, które odbyło się w dniach 6-8.12.2016 w Ostródzie.
Sensorless algorithm for sustaining controllability of IPMSM drive in electric vehicle after resolver fault
- Leszek Jarzębowicz
- Krzysztof Karwowski
- Wlodek Kulesza
2017 Pełny tekst CONTROL ENGINEERING PRACTICE
This paper presents a sensorless algorithm designated for the emergency control of an interior permanent magnet synchronous motor (IPMSM) drive in electric or hybrid vehicle. The algorithm is based on analysing the derivatives of motor phase currents measured over the duration of particular inverter states. The method is computationally simple and does not require additional hardware since the derivatives are measured indirectly. A lag between activating the algorithm and re-establishing torque controllability is defined. The proposed algorithm was implemented in the controller of a laboratory IPMSM vehicle drive and tested under varying operational conditions, including emergency activation.
Sensorless Control of Polyphase Induction Machines
- Zbigniew Krzemiński
2017
The basics of transformations of polyphase systems into orthogonal systems are explained. Vector models of induction machines in orthogonal planes are analysed and multiscalar models for rotor flux and main flux together with stator current are presented. A speed observer based on an extended model of the induction machine for selected variables is applied in the control system for the induction machine. On the basis of the model developed for a three phase machine, a multiscalar model for a five phase machine is presented. The control system acts on the basis of the model for the first sequence of phases achieving speed control. The model for the second sequence of phases is used to synchronize the fluxes in orthogonal planes. Near trapezoidal flux distribution in the air gap is achieved independently of the machine load. All variables used in the control system are estimated using the speed observer for the first sequence and the Luenberger observer for the second sequence. The properties of the control systems are explained using examples of transients generated by simulations.
Sensorless Disturbance Detection for Five Phase Induction Motor with Third Harmonic Injection
- Patrick Strankowski
- Jarosław Guziński
- Marcin Morawiec
- Arkadiusz Lewicki
- Filip Wilczyński
2017
The paper presents a sensorless disturbance detection procedure that was done on a five phase induction motor with third harmonic injection. A test bench was developed where a three phase machine serves as disturbance generator of different frequencies. The control of the machines is based on multi scalar variables that ensures an independent control of the motor EMF and the rotor flux. For disturbance identification a speed observer system with load torque observer was implemented. It has been shown that the analysis of the estimated load torque provides sufficient results for disturbance identification. All investigations were done on an experimental setup.
Sensorless Field Oriented Control of Five Phase Induction Motor with Third Harmonic Injection
- Filip Wilczyński
- Marcin Morawiec
- Patrick Strankowski
- Jarosław Guziński
- Arkadiusz Lewicki
2017
In this paper, a sensorless field oriented control system of five-phase induction machine with the 3rd harmonic rotor flux is presented. Two vector models, α1-β1 and α3-β3, were transformed into d1-q1, d3-q3 models oriented in rotating frames, which correspond to the 1st and 3rd harmonic plane respectively. The authors proposed the linearization of the model in d-q coordinate frames by introducing a new variable “x” which is proportional to the electromagnetic torque. Based on the static feedback control law, a dual mathematical model of the fivephase induction machine was linearized to synthesize a control structure in which electromagnetic torque and the rotor flux in each plane can be independently controlled. The control system proposed includes two uninfluenced subsystems (related to the 1st and 3rd harmonic), which are specifically synchronized to obtain a quasi-trapezoidal air gap flux distribution. This pattern provides a better iron utilization without saturating it, which consequently, increases the output torque. To accomplish a sensorless control configuration the state machine’s variables and the rotor speed are estimated by an extended speed observer. The proposed control algorithm was verified on an experimental setup. The results presents the desired air gap flux in steady as well transient states under various load conditions.
Sensorless Multiscalar Control of Five-Phase Induction Machine with Inverter Output Filter
- Jarosław Guziński
- Marcin Morawiec
- Patrick Strankowski
- Zbigniew Krzemiński
- Arkadiusz Lewicki
- Grzegorz Andrzej Kostro
- Kamil Woronowski
2017
The paper presents a complete solution for speed sensorless control system for five-phase induction motor with voltage inverter, LC filter and nonlinear control of combined fundamental and third harmonic flux distribution. The control principle, also known as multiscalar control, nonlinear control or natural variables control, is based on a use of properly selected scalar variables in control feedback to linearize controlled system. The combination of flux harmonic distribution is implemented for five phase induction motor with concentrated stator windings in two reference frames. Moreover, the speed sensorless drive operation was only possible with a dual observer structure for both reference frames. The nonlinear control structure and the observers are extended by LC filter model.
Sensors in River Information Services of the Odra River in Poland: Current State and Planned Extension
- Andrzej Stateczny
2017
According to adopted in 2016 by the polish Council of Ministers assumptions for the plans for the progress of inland waterways in Poland for the years 2016-2020, with the perspective of 2030, assume that by 2030 Odra along its entire length and the Vistula from Warsaw to Gdansk, they will have become international shipping routes, which will be implemented system of River Information Services (RIS). Aspects of RIS sensor application on the Odra river during pilot phase in 2013 and planned implementation during extension stage are presented in article. The knowledge increased through Odra RIS development and application could be valuable for further RIS application also in Poland along Vistula.
Sentiment Analysis of Facebook Posts:the Uber case
- Anna Baj-Rogowska
2017
This article analyses the sentiment of opinions, i. e. its classification as phrases with a neutral, positive and negative emotional tone. Data used as a basis for the analysis were opinions expressed by Facebook users about Uber and collected in the period between July 2016 and July 2017. The primary objective of the study was to obtain information about the perceptions of Uber over thirteen consecutive months. The study confirms that this analysis type is of value to a contemporary business.
Serendipitous Recommendations Through Ontology-Based Contextual Pre-filtering
- Aleksandra Karpus
- Iacopo Vagliano
- Krzysztof Goczyła
2017
Context-aware Recommender Systems aim to provide users with better recommendations for their current situation. Although evaluations of recommender systems often focus on accuracy, it is not the only important aspect. Often recommendations are overspecialized, i.e. all of the same kind. To deal with this problem, other properties can be considered, such as serendipity. In this paper, we study how an ontology-based and context-aware pre-filtering technique which can be combined with existing recommendation algorithm performs in ranking tasks. We also investigate the impact of our method on the serendipity of the recommendations. We evaluated our approach through an offline study which showed that when used with well-known recommendation algorithms it can improve the accuracy and serendipity.
SERVICE ORIENTED SCENARIOS FOR SUPPORT ENTERPRISE PROJECT MANAGEMENT
- Henryk Krawczyk
- Narek Parsamyan
2017
In the paper, a service oriented architecture is used to describe various scenarios of human-oriented enterprises. They can be modeled by BPMN to show basic information flow. We consider business scenarios to present another modeling solution called service orchestration or service mashup. That approach gives an opportunity for the right management through taking the best possible choice of services, or composition of services. The aim of the paper is to explain the idea of such techniques and to present their usefulness for description of service based supply chain activities. The replacement of all human experience by IT services is not entirely possible; however, computer aid is desirable for an immediate flow of the comprehensive data. It is also emphasized that the proposed method can be used to implement various enterprise scenarios.
Services Marketing Influence On Marketing Theory Evolution,
- Anna Drapińska
- Teresa Fernandes
2017 Handel Wewnętrzny
The discovery of differences between tangible goods and services in the 1970s was one of the most landmark moments in the history of marketing with an emphasis being shifted to the need for using different/diversified marketing activities while dealing with various industries and types of products. The objective of this article is to briefly characterise the evolution of the marketing thought and to present the crucial influence of services marketing achievements on the shape and nature of modern marketing. As a result of the literature analysis it can be stated that currently a return to uniform marketing for all kinds of goods and markets is advocated. Researchers are stressing that since differences in goods have become irrelevant, marketing activities of services marketing nature should be conducted.
Settlement Networks in Polish Spatial Development Regional Plans
- Jacek Sołtys
2017 Pełny tekst IOP Conference Series: Materials Science and Engineering
In 1999, ten years after the great political changes in Poland, 16 self-governed regions (in Polish: voivodeship) were created. According to Polish law, voivodeship spatial development plans, or regional plans in short, determine basic elements of the settlement network. No detailed regulations indicate the specific elements of the settlement network or what features of these elements should be determined. For this reason, centres as elements of the settlement network are variously named in different regions and take the form of various models. The purposes of the research described in this article are: (1) recognition and systematization of settlement network models determined in regional plans; and (2) assessment of the readability of determination in planning and its usefulness in the practice of regional policy. Six models of settlement networks in regional plans have been identified and classified into types and sub-types. Names of specific levels of centres indicate that they were classified according to two criteria: (1) level of services, which concerns only 5 voivodships; and (2) importance in development, which concerns the 11 other voivodships. The hierarchical model referring to the importance of development is less understandable than the one related to services. In the text of most plans, centres of services and centres of development are treated independently from their names. In some plans the functional types of towns and cities are indicated. In some voivodships, specifications in the plan text are too general and seem to be rather useless in the practice of regional policy. The author suggests that regional plans should determine two kinds of centres: hierarchical service centres and non-hierarchical centres of development. These centres should be further distinguished according to: (1) their role in the activation of surroundings; (2) their level of development and the necessity of action for their development; and (3) the types of actions indicated in the regional policy.
Shape Memory Polyurethane Materials Containing Ferromagnetic Iron Oxide and Graphene Nanoplatelets
- Magdalena Urban
- Michał Strankowski
2017 Pełny tekst Materials
Intelligent materials, such as memory shape polymers, have attracted considerable attention due to wide range of possible applications. Currently, intensive research is underway, in matters of obtaining memory shape materials that can be actuated via inductive methods, for example with help of magnetic field. In this work, an attempt was made to develop a new polymer composite—polyurethane modified with graphene nanoplates and ferromagnetic iron oxides—with improved mechanical properties and introduced magnetic and memory shape properties. Based on the conducted literature review, gathered data were compared to the results of similar materials. Obtained materials were tested for their thermal, rheological, mechanical and shape memory properties. Structure of both fillers and composites were also analyzed using various spectroscopic methods. The addition of fillers to the polyurethane matrix improved the mechanical and shape memory properties, without having a noticeable impact on thermal properties. As it was expected, the high content of fillers caused a significant change in viscosity of filled prepolymers (during the synthesis stage). Each of the studied composites showed better mechanical properties than the unmodified polyurethanes. The addition of magnetic particles introduced additional properties to the composite, which could significantly expand the functionality of the materials developed in this work.
Shape Optimisation of Kaplan Turbine Blades Using Genetic Algorithms
- Marzena Banaszek
2017
This monograph is a comprehensive guide to a method of blade profile optimisation for Kaplan-type turbines. This method is based on modelling the interaction between rotor and stator blades. Additionally, the shape of the draft tube is investigated. The influence of the periodic boundary condition vs. full geometry is also discussed. Evolutionary algorithms (EA) are used as an optimisation method together with artificial neural networks (ANN) for objective fitness function approximation. This is due to high computation demand of CFD calculation. ANN allows for significant calculation time reduction. The advantage of EA over other methods is that it seeks for global rather than local optimum. The optimisation criterion (objective fitness function) is the politropic loss coefficient.
Shape-Based Pose Estimation of Robotic Surgical Instruments
- Daniel Węsierski
- Sebastian Cygert
2017
We describe a detector of robotic instrument parts in image-guided surgery. The detector consists of a huge ensemble of scale-variant and pose-dedicated, rigid appearance templates. The templates, which are equipped with pose-related keypoints and segmentation masks, allow for explicit pose estimation and segmentation of multiple end-effectors as well as fine-grained non-maximum suppression. We train the templates by grouping examples of end-effector articulations, imaged at various viewpoints, in thus arising space of instrument shapes. Proposed shape-based grouping forms tight clusters of pose-specific end-effector appearance. Experimental results show that the proposed method can effectively estimate the end-effector pose and delineate its boundary while being trained with moderately sized data clusters. We then show that matching such huge ensemble of templates takes less than one second on commodity hardware.
Shaping of the turnout diverging track with variable curvature sections
- Władysław Koc
2017 International Journal of Rail Transportation
The paper presents an analytical method of shaping the turnout diverging railroad track with variable curvature segments on its length, which in an evident way distinguished it from a typical solution, made up of a single circular arc with no transition curves. Two separate causes including a linear and a nonlinear curvature one in the form of a polynomial have been examined. The obtained solutions of the problem have a universal character, i.e. the possibility to adopt any arbitrary values of curvature at the outset and the end of a geometric layout. Taking advantage of the above a comparative analysis of some selected variants could be carried out.
Shaping Place Identity through Interaction on the Example of the European Solidarity Centre in Gdansk
- Wojciech Targowski
- Piotr Czyż
2017 Pełny tekst
The article presents process of shaping place identity on the example of an important for Pomerania region investment - European Solidarity Centre. The realization of the European Solidarity Centre aims to be one of the essential elements of shaping Gdańsk’s identity of space. The article is an attempt to analyse how the presence of realization gradually affects the formation of the place identity of new urban space. Analysis of this realization will allow on the one hand to verify design assumptions made by authors, on the other provides the opportunity to search for best description of still vague notion of local identity. This concept, though intuitively close to everyone still seems to elude conceptual apparatus of theory of architecture. The intention of this article is to explore the notion of identity based on the observations of the newly realized significant cultural space. This analysis approaches the concept of identity from two perspectives. The first approach draws from the concept of identity of Christian Norberg-Schulz. Here, local identity is seen as a unique set of characteristics of space. So seen the concept of place identity is a correlate of concept of personal identity. In this analysis, methods of description of personal identity were transferred to the identity of the place. In the second approach, the identity of place is understood as a unique for that place way of being in space, way to spend time and development of the sitespecific urban rituals. Such a concept of identity, draws from the concept of place of Kim Dovey. Both presented approaches seems to complement each other but they also emphasize different qualities. Meaningful elements are seen from aesthetic perspective. In this perspective, the concept of place identity is seen as a static formation. This perfectly corresponds to design determinants of historical spaces associated with the concept of cultural heritage. In the authors' opinion identity of the place is also built on the interactions that occur between users in space. The space in this approach becomes a catalyst for social contact. What is important for the user is the formation of identity through customs. This concept of place recognizes dynamic nature of space identity - as a changeable formation which is continuously co-created. Such recognition can give better understanding of identity for specific design conditions, such as gradual formation of new urban spaces.
"Shaping space" programme as a tool for educating youth about architecture
- Piotr Marczak
2017 Pełny tekst
The Polish Architectural Policy’s vision of a systematic promotion of spatial culture has made its way into the national curriculum for 2009 – 2016 designed for various stages of child and teenager education. The objective of this effort was to furnish a basis for a system of architectural education which allows teaching society to be more conscious in their decisions as to spatial order with the effect of improving the quality of our living space. Educating individuals to engage consciously in activities related to the protection of space and transformations taking place within that space requires an understanding of basic issues connected with space, the nature of space and the interrelations of various elements which form it. The Shaping space programme under the patronage of the Chamber of Polish Architects is one of the tools dedicated to students of lower and higher secondary schools, designed to assist teachers as architectural educators. The aim of this paper is to present the results of a survey related to the implementation of the programme in Lower Secondary School 3 in Malbork in the years 2013-2016. The programme involved observation of students (of grades 1 to 3) in architecture-oriented classes, assistance for the teacher in the class rooms well as an evaluation of the usefulness of educational materials. A number of problems became evident during the implementation of the “Shaping space” programme which is now available in book form. The size of the book is large enough to discourage any potential readers. The subject matter of the book is not suitable for the intended age group (age: 13-16). Another issue was the teacher’s suitability to conduct this type of class. Class observation in grades 1-3 of the lower secondary school and discussions with teachers in charge of that programme served as a basis for developing our own tools and materials in the form of multimedia presentations, templates and lesson scenarios designed to convey and put in order the knowledge related to spatial planning. The conclusions drawn based on these observations have been used in classes at the Faculty of Architecture of the Gdansk University of Technology with a group of students in the 3rd semester of their MA studies, who have helped to prepare auxiliary materials for teachers conducting this type of programmes in primary schools. The joint effort has produced a dictionary entitled Pomeranian ABC of Space, which is designed as a tool for teachers.
Shared multi-processor scheduling
- Dariusz Dereniowski
- Wiesław Kubiak
2017 EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
We study shared multi-processor scheduling problem where each job can be executed on its private processor and simultaneously on one of many processors shared by all jobs in order to reduce the job’s completion time due to processing time overlap. The total weighted overlap of all jobs is to be maximized. The problem models subcontracting scheduling in supply chains and divisible load scheduling in computing. We show that synchronized schedules that complete each job at the same time on its private and shared processor, if any is actually used by the job, include optimal schedules. We prove that the problem is NP-hard in the strong sense for jobs with arbitrary weights, and we give an efficient, polynomial-time algorithm for the problem with equal weights.