The Bulletin of the Polish Academy of Sciences: Technical Sciences (Bull.Pol. Ac.: Tech.) is published bimonthly by the Division IV Engineering Sciences of the Polish Academy of Sciences, since the beginning of the existence of the PAS in 1952. The journal is peer‐reviewed and is published both in printed and electronic form. It is established for the publication of original high quality papers from multidisciplinary Engineering sciences with the following topics preferred: Artificial and Computational Intelligence, Biomedical Engineering and Biotechnology, Civil Engineering, Control, Informatics and Robotics, Electronics, Telecommunication and Optoelectronics, Mechanical and Aeronautical Engineering, Thermodynamics, Material Science and Nanotechnology, Power Systems and Power Electronics. Journal Metrics: JCR Impact Factor 2018: 1.361, 5 Year Impact Factor: 1.323, SCImago Journal Rank (SJR) 2017: 0.319, Source Normalized Impact per Paper (SNIP) 2017: 1.005, CiteScore 2017: 1.27, The Polish Ministry of Science and Higher Education 2017: 25 points. Abbreviations/Acronym: Journal citation: Bull. Pol. Ac.: Tech., ISO: Bull. Pol. Acad. Sci.-Tech. Sci., JCR Abbrev: B POL ACAD SCI-TECH Acronym in the Editorial System: BPASTS.
The article presents empirical material obtained in sociological surveys conducted in the Wejherowo area in the year 2014. The purpose of the survey was to record the residents’ opinions on the needs and problems relating to selected functioning aspects of the town and its downtown district, the perception and valuation of the area, the town’s revitalization investments, both planned and in progress, and the perception of the changes taking place in selected spheres of the town’s life. The survey reveals that the dwellers of Wejherowo are capable of responding to the problems the town faces in intellectual and personal dimensions, they follow the postulates related to the ideas and concepts of a creative town more or less consciously, and have a preference for the town ensuring access to the broadly construed culture and entertainment. This encapsulates a vision of developing town cultures, with the focal point evidently shifted from the concept of a town as a place accumulating specimens of architecture and a symbolic space to the town construed as a complex of better facilities and solutions which make everyday life more convenient. More frequently than ever before, town identity becomes the function of negotiations between what is local and what is global. The quality of town life and the features of its ‘town-like character’ appear to be the outcome of continuous and subtle dialectics between the residents and the physical form in which they live, i.e. the town.
Good quality communication in the family is a source of positive relations among its members. It is the most important characteristic of a well-functioning family. Very interesting perceptions of communication in the family are held by high achieving students. In those young people, communication in the family correlates negatively with their high grade point average. Also, they evaluate positively communication in the family as a whole but less positively one-to-one verbal interactions with the mother and the father. This observation is explained by the fact that the family forms a system. Moreover, communication is associated with positive relationships and attitudes such as acceptance and autonomy, but correlates negatively with control, over-demanding behaviour, and inconsistency in the parents of high achieving students.
Drinking fresh water, turning the lights on, travelling by tram, calling our family, or getting a medical treatment are usual activities, but the underlying SCADA (Supervisory Control and Data Acquisition) systems like CIS (Critical Infrastructure Systems), ICS (Industrial Control Systems) or DCS (Distributed Control Systems) were always the target of many types of attacks, endangered the above mentioned simple activities. During the last decades because of the fast spread of the internet based services and the continuous technical development these systems become more vulnerable than ever. Full reconstruction and innovative changes in older SCADA systems has high cost, and it is not always rewarding. Communication protocols as Modbus (1979) serve as a main basis for SCADA systems, so security of Modbus has a major impact of the security of SCADA systems. Our paper raises and answers questions about the security of the Modbus RTU protocol. We focus on the serial Modbus protocol, because in that method we found many unsolved problems, like lack of authentication of the participants, lack of secure channel and so on. The aim of this paper to propose a secure communication alternative for Modbus RTU @ RS485 wire. The main advantage of the proposed method is the coexistence with traditional slaves and bus systems and only software update is necessary
This paper presents a synthesis of research in the field of social activity in development of urban public spaces. Interest in social participation in which many groups sees a remedy to the problems of the city - including spatial chaos - has many causes. One of them is the lack of trust in the social side to the profession of architecture. The article indicates the possible cause of this state for which it was flawed legislation and the planning system, which in practice is not conducive to the formation of order, harmony and beauty, but facilitate the implementation of the narrow groups of interests, bringing the rank of designer as creator of the role of the investor's decision executor.
The main aim of the essay is to examine three philosophical narrations. One of them, Hegel’s master-slave dialectic, clearly inspired the other two, that is: Marx’s reflections in his Economic and Philosophic Manuscripts of 1844 and the interpretation of the Odyssey in Horkheimer and Adorno’s Dialectic of Enlightenment. Whereas Hegel’s dialectic opens a perspective of mutual recognition of individuals, permanently codified in their fundamental rights, the two remaining narrations lead to totally different conclusions. According to young Marx, the subjects not only do not recognize themselves mutually but even, under the influence of economic relationships, treat each other with disregard. Also in Adorno and Horkehimer’s view the labor processes, which according to Hegel led towards the freedom of individuals, distort interpersonal relations and strengthen the growing coercion. At the end, the proposal of Jürgen Habermas is taken into consideration. He argues that communication acts instead of labor processes are the real emancipating factor.
The claim of this article is to argue that the main thrust of Karl Marx’s philosophy was neither a critique of political economy, nor a critique of the bourgeois political system, but an anti-theistic raid of a metaphysical nature, and that this drive gave him the impetus that motivated his intellectual activity from the time when he had not yet had any economic theory and when the proletariat had not yet played a major role within the purview of his interests. Marx’ rebellion led him to a condemnation of the entire creation as a product of an evil Demiurge, who – to exacerbate the situation even further – was nothing else than a product of human false consciousness, manifesting itself politically as a division of any populace into friends and foes, who were subsequently conglomerated into antagonistic social classes but could be transformed in appropriate conditions into stateless community of friends.
The concept of place has been present in human geography for almost half a century. The human geographers looked for the answer about genesis of place category in different sociological or psychological aspects with the basis of space dimension. In last two decades a few of them referred that idea to communication processes. Inspired by the views expressed by the latter group of scientists, we are asking: how is creating a place? We put forward thesis that a special type of place making is social communication that works continuously on the principle of the palimpsest of overlapping meanings through messages arising in several dimensions. Our assumption is that every place is creating (overwriting) a social subject – an individual or a group, that will build communication in three dimensions: within a space/place (W), about a space/place (A), and/or between people and a space/place (B).
The article describes the relationship between the local community and the primary school considered as “place” within the meaning derived from the book by yi-Fu Tuan “Space and place: The perspective of experience”. The article compares the cases of two schools in the city of bielsko-biała (the city has a population of 175 thousands inhabitants). One school is overcrowded, yet its future existence has been secured. The second school, however, was first transferred to another location and it eventually went into liquidation in 2012. The article demonstrates then underlying reasons and consequences of losing the school as place. Moreover, it indicates potential problems emerging in such cases altogether with a set of possible solutions.
Touch-trigger probes for CNC milling machines usually use wireless communication in the radio or IR band. Additionally they enable triggering signal filtering in order to avoid false triggers of the probe. These solutions cause a delay in trigger signal transmission from the probe to the machine tool controller. This delay creates an additional pre-travel component, which is directly proportional to the measurement speed and which is the cause of a previously observed but not explained increase of the pre-travel with the increase of the measurement speed. In the paper, a method of testing the delay time of triggering signal is described, an example of delay time testing results is presented and the previous, unexplained results of other researchers are analysed in terms of signal transmission delay.
Paper deals with the new localizer GLOP2 designed for detection of the miners trapped in underground hard coal mines. The results of a field test conducted in coal mine BOBREK show that the presented localizer allows for efficient measurement of the distance between a trapped miner and the rescuer in the range of up to 15 m.
Based on real-time multi-domain communication signal analysis architecture, a high-efficiency blind carrier frequency estimation algorithm using the power spectrum symmetry of the measured modulated signal is presented. The proposed algorithm, which utilizes the moving averaged power spectrum achieved by the realtime spectrum analysis, iteratively identifies the carrier frequency in according to the power difference between the upper sideband and lower sideband, which is defined and revised by the estimated carrier frequency in each iteration. When the power difference of the two sidebands converges to the preset threshold, the carrier frequency can be obtained. For the modulation analysis, the measured signal can be coarsely compensated by the estimated result, and the residual carrier frequency error is eliminated by a following carrier synchronization loop. Compared with previous works, owing to the moving averaged power spectrum normalization and the smart iterative step variation mechanism for the two sidebands definition, the carrier frequency estimation accuracy and speed can be significantly improved without increasing the computational effort. Experimental results are included to demonstrate the outstanding performance of the proposed algorithm.
The significance of the famous Shannon's publication "A mathematical theory of communication" is discussed. The author states that this theory was a breakthrough for the times it was created. The present-day communications is so highly developed, that some old maxims should be up-dated, particularly the definition of the lower bound of signal reception. The author claims that this bound is no longer a constant value, ln(2), as the Shannon's theory states, but depends on many factors such, as the ratio of bandwidth-to-information transmission rate, the class of a receiver (adaptive, cognitive, MIMO1), the kind of reception system (on-line or off-line), and - of course - on the characteristics of noise, including entropy. Then, an absolute limit (Eb/N0)abs = 0 is suggested. An example of an advanced adaptive system approaching this bound is given.
In this paper, some issues of building a reliable, distributed measurement system for monitoring of water quality in reservoir Lake Dobczyckie are presented. The system is based on a measurement station that has the shape of a floating buoy which is supposed to be at anchor on the reservoir. Wireless data transmission problems that were encountered during the development of the buoy, modeling a radio link, and measurements of actual signal strength on the reservoir are discussed. A mathematical approach to procedures of early situation assessment was conducted, and specialized procedures were designed for measurement stations of the system. It is also discussed how such computations can improve a qualitative assessment of system performance in terms of real-time messaging
Good practices in the creation of the Commune Revitalization Program – cooperation between the University of Adam Mickiewicz and the City of Kalisz, The entry of the Revitalization Act on November 18, 2015 enabled municipalities to efficiently plan and conduct the process of moving degraded areas out of the crisis. The Act introduced key regulations affecting the programming of revitalization in Poland. One of the most important instruments is the Municipal Revitalization Program. In order to be able to fully use the potential of this document, we should look for solutions that allow creating the most comprehensive solutions. One of the examples of such activities is cooperation between the university and the local government. Thanks to this combination of practical knowledge of officials with theoretical knowledge of academic experts, we can say that it is a project unique in the country. It is also unique due to the fact that spatial economy students who actively participated in the document creation process were included in the work. The aim of the work is to present the course of the cooperation process of the University of Adam Mickiewicz with the Office during the preparation of the Municipal Revitalization Program for the city of Kalisz and showing the role that the students included in the project played in this project
This paper contains the results of phytosociological studies carried out on the model fragment of Spitsbergen tundra at Bellsund. In the area of 4800 m2 19 plant communities have been distinguished through association analysis and these communities, in turn, have been compared according to cluster analysis. Also, ecological groups of species have been distinguished.
The authors show how to strengthen the educational power of the museum. Emphasize the historical and contextual variability of the main functions performed by museum, indicate that the location of the museum in the community of the city and broaden the scope of its activities to different communities. Characterized by contemporary models of museum education, along with the arguments for taming the different models of learning both by visitors and museum’s staff. & e article presents two practices, which, in the opinion of the authors are conducive to learning in/and by the museum.
The study consists of three parts. The first comprises the characteristic features of social politics strategy. They include the basic assumptions and functions of the social politics strategy in the field of the development of education and aid activities at the level of local units of territorial authorities. The essence of the study is the second part. It consists of the own research results – an analysis of the aims and tasks associated with inclusive education (also with preparing local communities for creating inclusive culture), comprised in strategies. The whole is completed with final conclusions. The study is aimed at the qualitative analysis of the development strategy of 17 communes (3900 pages of documents) as regards the issues of disability. The research interest was to find out whether the slogans promoting the equal access to education, elimination of barriers and preparing mainstream schools and local community for inclusive culture had been reflected in any way in the social politics strategies of local authorities – in the documents which, at least in the assumptions, constitute the starting point for generating good practices, also in the field of social support and education for disabled learners.
Stanisław Wyspiański (1869–1907) was the Polish dramatist, the poet, besides the illustrator and the painter, one of the best known artist of the Young Poland movement. His journey to Europe (particulary to Paris) became very important experience in his life. He discovered the value of loneliness, he had to be alone – as an artist and as a man. He was called “a hermit from Cracow” and for this reason his genius was not always appreciated. However, at the end of life, Wyspiański undergoes a significant transformation: he feels a strong connection to community, as a member of the nation and society, as well as a host.
The activity of territorial self-government shaped institutionally during the development process is characterized by a significant scope of care for the financial situation, which determines the efficiency of its functioning. The general availability of public services is a condition for the assessment of the activities of municipalities (powiats, voivodeships). Institutional economy as a real one, takes into account an integrated point of view. The aim of the study is to present the territorial differentiation of the eff ectiveness of communes’ activities in the context of institutional economics and to present the possibility of using a synthetic measure in this process. The synthetic measure of development fluctuated within the limits of 0.30 – Wąchock (Starachowice poviat, urban-rural commune) to 0.41 – Ostrowiec Św. (Ostrowiecki poviat, urban commune) in 2009, 0.32 – Łączna (Skarżysko poviat, rural commune) to 0.40 – Starachowice (Starachowice poviat, municipal commune) in 2015. The results of the analysis confirm the existence of small differences in the assessment of development communes of the Kamienna Basin. This approach allows the assessment of municipalities using one size and allows you to organize the analyzed objects in terms of the considered phenomenon.
Polish Sign Language (PJM) is a natural communication system that has been evolving for two centuries. It is at the heart of the identity and culture of the Deaf community in Poland, but it is often marginalized and neglected. It first came under serious linguistic scrutiny not long ago, and more systematic research on it has been initiated in recent years by a team of researchers at the Section for Sign Linguistics at the University of Warsaw.