2017 - Repozytorium publikacji - Politechnika Gdańska

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Tools for road infrastructure safety management in Poland
- Wojciech Kustra
- Lech Michalski
2017 Pełny tekst MATEC Web of Conferences
The objective of road safety infrastructure management is to ensure that when roads are planned, designed, built and used road risks can be systematically identified, assessed, removed and mitigated. There are a number of approaches to road safety management. European Union Directive 2008/96/EC requires EU member states to use four basic tools of road safety infrastructure management. An overview of the methods in these countries shows a variety of approaches to how these tools are used in practice. The paper presents a systematics of these tools and a concept of how they could be developed in Poland. It looks at the life cycle of a road structure and the requirements of risk management processes. The paper focuses on elements of scientific support to help build the necessary tools. To help with assessing the impact of a road project on the safety of related roads, a method was developed for long-term forecasts of accidents and accident victims and accident cost estimation as well as a risk classification to identify risks that are not acceptable risks. With regard to road safety audits and road safety inspection, a set of principles was developed to identify risks and the basic classification of errors and omissions. In the case of road network safety management, measures of individual and societal risk were selected. A method for classifying dangerous road sections was developed as well. An estimation is given of the consequences and effects of applying the tools of road safety management on the network of national roads in Poland until 2020
Top k Recommendations using Contextual Conditional Preferences Model
- Aleksandra Karpus
- Tommaso Di Noia
- Krzysztof Goczyła
2017 Pełny tekst Annals of Computer Science and Information Systems
Recommender systems are software tools and techniques which aim at suggesting to users items they might be interested in. Context-aware recommender systems are a particular category of recommender systems which exploit contextual information to provide more adequate recommendations. However, recommendation engines still suffer from the cold-start problem, namely where not enough information about users and their ratings is available. In this paper we introduce a method for generating a list of top k recommendations in a new user cold-start situations. It is based on a user model called Contextual Conditional Preferences and utilizes a satisfiability measure proposed in this paper. We analyze accuracy measures as well as serendipity, novelty and diversity of results obtained using three context-aware publicly available datasets in comparison with several contextual and traditional state-of-the-art baselines. We show that our method is applicable in the new user cold-start situations as well as in typical scenarios.
Total cross section for low-energy electron scattering from formic acid, (HCOOH), molecules
- Paweł Możejko
- Alicja Domaracka
- Mateusz Zawadzki
- Elżbieta Ptasińska-Denga
- Czesław Szmytkowski
2017 Pełny tekst Journal of Physics : Conference Series
Total cross section (TCS) for low-energy electron scattering from formic acid molecules has been measured using electrostatic electron spectrometer working in linear transmission mode. Two local maxima centered around 1.7 eV and 7.8 eV have been observed and associated with resonant scattering processes.
TOTAL SHIP OPERABILITY – REVIEW, CONCEPT AND CRITERIA
- Mohammad Hossein Ghaemi
- Henryk Olszewski
2017 Pełny tekst Polish Maritime Research
The ship operability can be understood and analysed in different manners, and its quality is described using different indexes by different authors. Practically, there is no general and widely accepted description of total ship operability in the literature, nor in the rules of classification societies, which would include both seakeeping and manoeuvrability characteristics of a ship, and simultaneously take into account all ship subsystems and, what is most important, comfort and safety of people on board. The aim of this paper is to propose a general definition of total ship operability and name, adjust, describe and justify criteria which should be considered in the ship operability analysis, as well as to provide a relevant algorithm paving the road for further investigation on total ship operability determination.
Toward Fast Calculation of Communication Paths for Resilient Routing
- Kanstantsin Myslitski
- Jacek Rak
- Łukasz Kuszner
2017 NETWORKS
Utilization of alternate communication paths is a common technique to provide protection of transmission against failures of network nodes/links. However, a noticeable delay is encountered when calculating the relevant sets of disjoint paths using the available algorithms (e.g., using Bhandari’s approach). This, in turn, may have a serious impact on the ability of a network to serve dynamic demands (i.e., characterized by a relatively short duration time). To provide a solution to this problem, in this article we introduce an approach to pre-compute the sets of disjoint paths in advance to be able to start serving the demands shortly after their arrival. Our approach is based on the observation that the issue of establishing a set of node-disjoint paths is equivalent to the problem of determining the cheapest cycle in the network topology traversing the end nodes of a demand. In particular, we propose a generalization of this scheme assuming that any pair of node-disjoint paths can be obtained by means of merging a number of basic cycles defined for a network topology. A new method to calculate the cheapest end-to-end cycles based on the so called basic cycles is introduced, which, as verified for real network topologies, reduces up to 70% the time needed to establish node-disjoint paths (compared with the results obtained for the reference Bhandari’s scheme).
Toward Polyethylene–Polyester Block and Graft Copolymers with Tunable Polarity
- Szymon Rutkowski
- Arkadiusz Zych
- Marta Przybysz-Romatowska
- Miloud Bouyahyi
- Paweł Sowiński
- Rolf Koevoets
- Józef Haponiuk
- Robert Graf
- Michael Ryan Hansen
- Lidia Jasińska-Walc
- Rob Duchateau
2017 MACROMOLECULES
The synthesis and characterization of polyethylene–polyester block and graft copolymers and their potential as compatibilizers in polyethylene-based polymer blends are being described. The various routes to functionalized polyethylenes and the corresponding block/graft copolymers have been compared and evaluated for their scalability to industrial scale production. Hydroxyl chain-end and randomly OH-functionalized HDPE as well as randomly OH-functionalized LLDPE were employed as macroinitiators for producing the corresponding block and graft copolymers. These materials were prepared using two different strategies. The grafting from approach entails catalytic ring-opening polymerization of lactones, i.e., ε-caprolactone and ω-pentadecalactone and hydroxyl-functionalized polyethylenes as macroinitiator. The alternative grafting onto approach involves the preparation of block and graft copolymers via simple and convenient transesterification of polycaprolactone or polypentadecalactone with OH-functionalized polyethylenes. The copolymers were characterized in terms of their molecular weight (SEC), chemical structure (liquid state NMR), topology (MALDI-ToF-MS), supramolecular assembly (solid state NMR), and thermal properties (DSC analysis). The applied techniques for synthesizing the copolymers allow preparation of the products with sufficiently high molecular weight of the final materials. The copolymers were tested as compatibilizers for polyethylene/polycarbonate blends. As proven by SEM analysis, addition of the compatibilizers resulted in a significant improvement of the blend morphology.
Towards 5G — Cloud-based Radio Access Networks
- Sławomir Gajewski
2017 Pełny tekst Zeszyty Naukowe Akademii Marynarki Wojennej
In the paper a general concept of the 5G network architecture is presented as well as system requirements having impact on innovative solutions in the 5G network are highlighted. A major part of the paper is both presentation and discussion of the problem of Cloud Radio Access Network introduction for public networks in which the cell and resource virtualisation will be implemented. On the other hand, the problem of resource virtualization in the STRUGA system is discussed in which the C-RAN implementation is proposed for performance improvement.
Towards a process based management system for oil port infrastructure in context of insurance
- Dariusz Gołębiewski
- Kazimierz Kosmowski
2017 Pełny tekst Journal of Polish Safety and Reliability Association, Summer Safety and Reliability Seminars
This article addresses selected methodological aspects of a process based management system based on analysis of hazards and threats and risk evaluation for an oil port infrastructure in context of insurance. The oil port terminal is regarded as important system of the critical infrastructure that require careful system oriented approach to deal with integrated aspects of environmental, safety and security management to reduce risk of potential consequences of abnormalities and accidents, especially major accidents with catastrophic consequences. The risk of potential economic losses should be also minimised applying in practice an effective business continuity management system. Careful evaluations of relevant risks carried out for the oil port infrastructure are crucial also for the insurance company. Some requirements and activities of the risk engineer and the underwriter in the insurance process are outlined including important factors influencing risks. It is emphasised that determining and evaluating a set of key performance indicators based on data from site audits and analyses can be useful for the safety management of the oil port and its insurance.
Towards an experience based collective computational intelligence for manufacturing
- Syed Imran Shafiq
- Cesar Sanin
- Edward Szczerbicki
- Carlos Toro
2017 Pełny tekst Future Generation Computer Systems-The International Journal of Grid Computing-Theory Methods and Applications
Knowledge based support can play a vital role not only in the new fast emerging information and communication technology based industry, but also in traditional manufacturing. In this regard, several domain specific research endeavors have taken place in the past with limited success. Thus, there is a need to develop a flexible domain independent mechanism to capture, store, reuse, and share manufacturing knowledge. Consequently, innovative research to develop knowledge representation models of an engineering object and engineering process called Virtual engineering object (VEO) and Virtual engineering process (VEP) has been carried out and extensively reported. This paper proposes Virtual engineering factory (VEF), the final phase to create complete virtual manufacturing environment which would make use of the experience and knowledge involved in the factory at all levels. VEF is an experience based knowledge representation for a factory encompassing VEP and VEO within it. The novelty of this approach is that it uses manufacturer’s own previous experience and formal decisions to collect and expand intelligence for future production. The experience based collective computational techniques of Set of Experience Knowledge Structure (SOEKS) and Decisional DNA (DDNA) are used to develop aforesaid models. In this article the concept and architecture of VEF is explained as well as the integration of all three levels of virtual manufacturing i.e. VEO, VEP and VEF is presented. Furthermore, a case-study is presented to validate the practical implementation of the proposed concept. The benefits of this approach are manifold as it creates the environment for collective intelligence of a factory and enhances effective decision making. The models and research presented here embody the important first step into developing the future computational setting as required by the emerging next generation of cyber-physical systems.
Towards better understanding of context-aware knowledge transformation
- Mieczysław Owoc
- Paweł Weichbroth
- Karol Żuralski
2017 Pełny tekst Annals of Computer Science and Information Systems
Considering different aspects of knowledge functioning, context is poorly understood in spite of intuitively identifying this concept with environmental recognition. For dynamic knowledge, context especially seems to be an essential factor of change. Investigation on the impact of context on knowledge dynamics or more generally on the relationship between knowledge and its contextual interpretation is important in order to understand knowledge dynamics. The aim of this paper is to research and examine the nature of knowledge transformation (a specific sort of life-cycle), and to identify contextual factors affecting knowledge dynamics.
Towards facts extraction from text in Polish language
- Tomasz Maria Boiński
- Adam Chojnowski
2017 Pełny tekst
Natural Language Processing (NLP) finds many usages in different fields of endeavor. Many tools exists allowing analysis of English language. For Polish language the situation is different as the language itself is more complicated. In this paper we show differences between NLP of Polish and English language. Existing solutions are presented and TEAMS software for facts extraction is described. The paper shows also evaluation of the proposed solution and the tools used. Finally some conclusions are given.
Towards Hybrid Urban Mobility: Kick Scooter as a Means of Individual Transport in the City
- Małgorzata Kostrzewska
- Bartosz Macikowski
2017 Pełny tekst
The characteristic feature of a contemporary city is its inconvenience and oppressiveness caused by the hitherto dominant paradigm of urban planning based on car mobility. As a result, the inhabitants have to cope with air pollution, noise, spatial barriers, sedentary lifestyle and other factors which worsen their health and quality of life. Ecological and physically activating urban mobility thus plays an increasingly important role in the process of creating a friendly and healthy city. For many years, a steadily increasing share of bicycles in urban traffic has been observed. There are also other trending forms of non-motorized transport, such as in-line skates, skateboards, kick scooters, etc. Riding each of them can be regarded as a form of recreation or sport, but also as an ecological, physically activating means of urban mobility. The paper discusses the different forms of recreational mobility in the context of the possibility of combining it with city public transport, with particular emphasis on kick scooters. Kick scooters are becoming more and more popular, not only among children and youth, but also among adults, who use it mainly as a means of the non-motorised urban transport. Numerous publications from different parts of the world show a dynamic growth of this phenomenon. The aim of the article is also to answer the question in what extent the design of public space takes into consideration the use of these new forms of transport and recreation and, consequently, what aspects and requirements should be taken into account in the planning and design process. The paper presents the conclusions of a field study carried out with a group of students in Szczecin and Berlin. The aim of the research was to evaluate the possibilities of using kick scooters in big cities as a means of hybrid mobility combined with public transport by exploring the spectrum of public spaces (streets, squares, traffic nodes and hubs, public buildings, etc.) and testing the existing urban infrastructure. The experiment and research results seem to confirm the vast possibilities granted by kick scooters in this regard.
Towards improved energy efficiency of future smart ships by application of advanced CFD simulations – case study
- Karol Niklas
2017
The international trade plays crucial role in today’s globally developed world’s economy. Many people are unaware of the unimaginable volume of cargo being transported every year by oceans and seas. For most of the time invisible from land the shipping industry preserves its strong position of the most cost-efficient and environmental friendly mean of transport. However during last years the shipping industry is under great pressure to reduce an environmental impact. The significant rise of ship’s energy efficiency is expected by technology development and also by improved management. In both cases a great advantage of computer simulations can be utilized. In the article the CFD technology was applied to analyze a case study ship behavior in selected operational states. The computer simulations were verified by experimental measurements on the ship which proved significant rise in effective operational efficiency for analyzed cases. The huge potential of CFD simulation technology was demonstrated for limiting fuel consumption and CO2, NOx, SOx emission.
Towards neural knowledge DNA
- Haoxi Zhang
- Cesar Sanin
- Edward Szczerbicki
2017 Pełny tekst JOURNAL OF INTELLIGENT & FUZZY SYSTEMS
In this paper, we propose the Neural Knowledge DNA, a framework that tailors the ideas underlying the success of neural networks to the scope of knowledge representation. Knowledge representation is a fundamental field that dedicates to representing information about the world in a form that computer systems can utilize to solve complex tasks. The proposed Neural Knowledge DNA is designed to support discovering, storing, reusing, improving, and sharing knowledge among machines and computing devices. It is constructed in a similar fashion of how DNA formed: built up by four essential elements.
Towards Precise Visual Navigation and Direct Georeferencing for MAV Using ORB-SLAM2
- Paweł Burdziakowski
2017 Pełny tekst
A low accuracy of positioning using Global Navigation Satellite System (GNSS) are not meet geodetic requirements for direct images georeferencing for Unmanned Aerial Vehicle (UAV) photogrammetry. A majority of UAVs are equipped with a monocular or stereo non-metric cameras for either visual data gathering or live video feed for operator. A cheap positioning techniques used on board commercial UAVs are not that precise as geodetic community requires. Moreover, a traditional satellite navigation suffers from a multipath Global Positioning System (GPS) signal in an industrial environment and cities or during operation in poor GPS space segment geometry or in indoor environment. In that cases, the UAV position can be enhanced by a visual navigation method. The paper presents a results of implementation of recently developed robust simultaneous localization and mapping method for a low cost hexacopter platforms navigation system augmentation, in order to support a precise and robust direct images georeferencing.
Towards Resource Theory of Coherence in Distributed Scenarios
- Alexander Streltsov
- Swapan Rana
- Manabendra Nath Bera
- Maciej Lewenstein
2017 Pełny tekst Physical Review X
The search for a simple description of fundamental physical processes is an important part of quantum theory. One example for such an abstraction can be found in the distance lab paradigm: if two separated parties are connected via a classical channel, it is notoriously difficult to characterize all possible operations these parties can perform. This class of operations is widely known as local operations and classical communication. Surprisingly, the situation becomes comparably simple if the more general class of separable operations is considered, a finding that has been extensively used in quantum information theory for many years. Here, we propose a related approach for the resource theory of quantum coherence, where two distant parties can perform only measurements that do not create coherence and can communicate their outcomes via a classical channel. We call this class local incoherent operations and classical communication. While the characterization of this class is also difficult in general, we show that the larger class of separable incoherent operations has a simple mathematical form, yet still preserves the main features of local incoherent operations and classical communication. We demonstrate the relevance of our approach by applying it to three different tasks: assisted coherence distillation, quantum teleportation, and single-shot quantum state merging. We expect that the results we obtain in this work also transfer to other concepts of coherence that are discussed in recent literature. The approach we present here opens new ways to study the resource theory of coherence in distributed scenarios.
Tracking Moving Objects in Video Surveillance Systems with Kalman and Particle Filters – A Practical Approach
- Grzegorz Szwoch
2017
This Chapter focuses on the first type of object tracking algorithms, namely on Kalman and particle filters. A theory of these algorithms may be found in many publications, there are also reports on implementation of these approaches to object tracking in video. However, developers of VCA systems still face two important problems. The first one is related to obtaining accurate measurements of positions and sizes of the tracked objects, required for updating their tracker. It is easy to do if the object is clearly identified in the camera image, but in case of tracking conflicts, obtaining a valid measurement is not trivial The second problem is related to the parameters tuning in the object detection and tracking algorithms, in order to obtain accurate object tracks. Despite the abundance of publications on object tracking in video with these methods, it is not easy to find a clear solution to both problems. This Chapter has therefore two main aims. First, it attempts to fill the abovementioned gap, by describing the influence of the algorithm parameters on the obtained results, and also presenting the problem of obtaining accurate measurements for updating the tracking filter in presence of conflicts. Second, a novel approach that combines Kalman filters with particle filters, is proposed. This dual-type tracker uses the simpler Kalman filter when there are no conflicts, and the more demanding particle tracker only for resolving these conflicts.
Trade in value added of countries involved in TTIP: EU-USA comparison
- Aleksandra Parteka
- Joanna Wolszczak-Derlacz
2017 CESifo Forum
The aim of this paper is to present key facts concerning trade in the value added of those countries participating in the Transatlantic Trade and Investment Partnership (TTIP). In particular, we describe how involvement in global production networks (GPN) varies across EU countries with respect to the United States.
Tradycyjna lodownia – ekoenergetyczny magazyn żywności
- Marta Gosz
- Rafał Andrzejczyk
2017 Przemysł Spożywczy
W artykule omówiono konstrukcję oraz zasadę działania naturalnych przechowalni żywności, tzw. lodowni. Przedstawiono kilka przykładów takich konstrukcji wraz z opisem ich budowy. Na przykładzie jednego rozwiązania szczegółowo opisano zasadę działania procesów zachodzących wewnątrz przechowalni. Podkreślono neutralność tego typu budowli wobec środowiska. Przedstawiono zalety i wady analizowanego rozwiązania na tle sprężarkowych urządzeń chłodniczych.
Tradycyjna versus przyspieszona internacjonalizacja przedsiębiorstw z branż high-tech. Wyniki badań empirycznych
- Nelly Daszkiewicz
2017 Pełny tekst Problemy Zarządzania
The discussion on the role and importance of time in the process of internationalization of firms belongs to the mainstream of research in the field of internationalization. In the literature, the phenomenon of early and rapid internationalization was noticed in the early 1980s; however, the intensive development of the research into this phenomenon began a decade later and continues today. For several years in Poland, the share of early internationalized firms has been growing. These firms start their international activities almost from their inception. The main objective of the article is to present the pace of the internationalization process of firms from the perspective of two major theoretical approaches and its empirical verification. The article includes the literature review as well as the results of a survey conducted among 263 high-tech production firms from Poland. In the summary of the article, future directions of research are pointed out.