Detection of line segments

In the paper a method of line segment detection in the images is presented. It bases on existing LSD approach which was designed to be a parameterless technique dedicated to analysis of real world scenes. In consequence it encounters problems with other types of images, e.g. medical images, where the characteristic of the structures may be completely different. The method proposed in this work allows to tune its parameters for that characteristic and thus allows to achieve satisfactory results also for medical data. The effect of the approach is illustrated with mammographic images

Application of active contours with expert knowledge to heart ventricle segmentation

Automatic heart ventricle segmentation in CT heart images can be an element of system supporting pulmonary embolism diagnosis. To solve that problem in this paper an application of two classical active contour models, snakes and geometric active contours, is proposed. The prepared implementation uses the unified model of those techniques which allows to define forces acting upon a contour only once. The nature of the images causes that the process of force construction requires additional expert knowledge since using only the information visible in the image satisfactory results cannot be obtained

Impact of macro-scale circulation types on the occurrence of frosty days in Poland

The research aimed at determining variability of occurrence of frosty days in Poland and defining the impact of macro-scale circulation types on these days occurrence from December to March. The study used daily data concerning the minimum, maximum and mean daily air temperature for 15 stations located in Poland from 40 winter seasons between 1970/71 and 2009/10. In the predominantly large area of Poland; in the analysed multiannual period, a decrease in the number of frosty days was noticed; still, these changes were not statistically significant. The conducted research study showed that the North Atlantic Oscillation and the Scandinavian type had the most significant impact on the number of frosty days in Poland

The period of intense vegetation growth and maturing of plants in north-western Poland

The objective of the study consisted in determining the changeability of the dates of commencement and termination of the period of intense vegetation growth and the period of maturing of plants in north-western Poland, and also the respective durations thereof. Use was made of data concerning average monthly air temperatures for the years 1966–2015, which were obtained from the collections of the Institute of Meteorology and Water Management – National Research Institute. The period of intense vegetation growth has been defined as a period with average daily air temperature of ≥ 10oC, whereas the period of maturing of plants as one with an average daily air temperature of ≥ 15oC. The dates of commencement and termination of the aforementioned periods were determined using mathematical formulae proposed by Gumiński. On average, the period of intense vegetation growth commenced 3 days/10 years earlier and terminated 1 day/10 years later. In turn, the period of maturing of plants commenced on average 2 days/10 years earlier and terminated on average 2 days/10 years later. Research also revealed an increase in the duration of both the period of intense vegetation growth, and the period of maturing of plants in north-western Poland

Fale mrozów w Poznaniu i ich cyrkulacyjne uwarunkowania

The article aims to determine the long-term variability of frosty days and frost waves occurrence in Poznań, as well as to define the pressure conditions triggering off frost waves. A frosty day was defined as a day with the maximum temperature below the 5th percentile of the daily maximum temperature from a whole year (-1.7°C). A frost wave was defined as a sequence of at least 5 frosty days. In the analysed period, there were 44 frost waves which in total took 406 days. The most frequent were 7-day waves which represented 25% of all the frost waves. These tended to occur between November and March, with a majority of them (as much as 54.5%) in January. The occurrence of frost waves in Poznań in the discussed multiannual period was related to a ridge of high pressure above Eastern and Central Europe. During frost waves, the pressure over the analysed area was higher than the average in the winter season. According to the Grosswetterlagen (GWL) classification of weather types, frosty days forming frost waves were mainly associated with the anticyclonic circulation (54.0%).725726919Badania Fizjograficzn

Active partition based medical image understanding with self-organised competitive spatch eduction

Medical Image Understanding is a recently defined semantic oriented image recognition task. Its specific requirements, highlighting complex characteristics of recognised objects as well as indispensable use of human-level expert knowledge almost every step of data processing sets new requirements for implemented algorithms. This paper focuses on linguistic image description method, designed to segment low level, semantically coherent image regions and mine adjacency relations among them. Example method results on medical images are presented to specify some methods properties

Çocuk ve Gençlerin Aile Ortamı İçinde Yeni Medya Kullanımı Alanında Ailelerin Eğitim Sürecindeki Etkisi

This article is the empirical answer to the question: “In what way does their family environment shape the awareness of youth people in terms of the positive and negative aspects of online participation, and what are the communication-information competences that are necessary to remain safe whilst online?”. The theoretical analyses and research that were carried out (N=238, Poland) on youth people aged between thirteen and eighteen have made it possible to distinguish four different educational styles: neglectful, controlling, controlling-supporting, and partnership. Each is characterized by a variation in the specifics of the child-parent relationship, differing dynamics, the scope of educational influence in the family home, differing understandings of the significance of new mobile and web media, the varying knowledge of parents regarding their children’s e-activity in the context of online safety, and the competences that determine the development of safe forms of e-activity. The gathered data imply that one of the significant factors that protect teenagers from the electronic threats is parents’ knowledge and consequent parenting limits set in accordance with the ways of the new media are used in the family. Simultaneously, we need to point out that there is a further necessity to provide non-formal education among parents, increasing the digital competencies in the area of threats caused by the development of the information society.Bu makale, "Aile ortamı, çevrimiçi katılımın olumlu ve olumsuz yönleri açısından gençlerin farkındalığını nasıl şekillendirir ve çevrimiçi iken güvenli kalınabilmesi için gerekli olan iletişim-bilgi yeterlilikleri nelerdir?" sorusunun deneysel cevabıdır. On üç ve on sekiz yaşları arasındaki gençler üzerinde yapılan bu teorik analiz ve araştırmalar (N=238, Polonya), dört farklı eğitim tarzını farketmemizi sağlamıştır: ihmalkar, kontrol eden, kontrol eden- destekleyen ve işbirlikçi. Her biri, çocuk-aile ilişkisinin özellikleri, farklı dinamikler, aile evindeki eğitim etkisinin kapsamı, yeni mobil ve web medyasının öneminin farklı anlayışları, ailelerin çocuklarıyla alakalı çevrim içi güvenlik bağlamındaki farklılaşan bilgileri ve e-aktivitenin güvenli formlarının gelişimini belirleyen yetkinlikler ile karakterize edilmiştir. Elde edilen veriler, gençleri elektronik tehditlerden koruyan önemli faktörlerden birinin, ailenin bilgisi ve bunun sonucunda ise, aile içinde yeni medya kullanım yollarına uygun şekilde ebeveynlik sınırları kurulduğunu belirtir. Eşzamanlı olarak, bilgi toplumunun gelişiminin sebep olduğu tehditler alanında dijital yetenekleri arttırarak aileler arasında yaygın bir eğitimin verilmesi için daha ileri gereksinimlerin olduğunu belirtmeliyiz

Personalisation through pricing co-creation: Customer’s willingness to pay and pricing strategies in the B2C context of hospitality

In the era of connectivity, personalisation is an increasingly popular phenomenon in the marketplace. Modern customers are more demanding with higher barging power. The evolution towards customer-dominant logic (CDL) illuminates the transmission of value-creating roles to customers beyond visible service interaction. While the advantages of personalising the products and services are evident, a level of ambiguity persists when considering the tacit dimension of a transaction, specifically concerning pricing. The marketing and revenue management literature suggests a linear relationship between personalisation and willingness to pay (WTP). WTP is context-dependent, and further exploring the influence of personalisation benefits on customer WTP is needed. This study aims to explore how customer expectation of personalisation affects WTP in the hospitality industry, using CDL as the theoretical lens. A pragmatism stance guides the methodological design using mixed methods and leans toward the abductive approach as the central concept that derives from existing knowledge. The employed method includes two rounds of data collection: 43 semi-structured in-depth interviews and 202 online self-administrated surveys. The interpretive qualitative analysis identifies six distinctive customer types, namely: Budget Adventures, Family Explorers, Relaxation Seekers, Relation Seekers, Delight Seekers, and Must-Have Customers. Findings suggest consumers are keen to receive personalised offers, but their WTP varies. The findings from the quantitative analysis indicate that the personalisation and customer WTP relationship is not linear. WTP largely depends on the customer’s internal and external context. The study illustrates that specific context influences WTP, customer purchase behaviour, and personalisation expectations. The theoretical contribution is made to the knowledge of marketing and revenue management through CDL by advancing the understanding of experience co-creation, segmentation, and pricing. As a contribution to knowledge and practice, the study offers a novel customer typology and explains the relationship between expectations of personalisation and customer WTP. The strength of this work lies in tangible recommendations for practitioners that should lead managers and decision-makers to concentrate more on different customer clusters at different times to develop effective pricing strategies. Findings can also help managers decide what type of personalisation may best suit their customers’ context and what pricing approach they should take to optimise revenue. The findings can apply widely to other services, like airline, retail, banking, insurance, transportation, logistics, rail, or events. The avenues for future research conclude the thesis

Atmospheric circulation conditions during winter warm spells in Central Europe

The objective of the paper was to characterise the temporal and spatial variability of winter warm spells in Central Europe in the years 1966/1967-2015/2016 and to determine the circulation conditions of their occurrence. The applied data were obtained from the Polish Institute of Meteorology and Water Management, Deutscher Wetterdienst and the National Centre for Environmental Prediction/National Centre for Atmospheric Research. A warm spell was defined as a sequence of at least three warm days, i.e. when the maximum air temperature is higher than the 95th percentile of the probability density function designated from observation. The research has proven that over the study period the air temperature increased in the winter season in Central Europe and this translated into an increase in the number of warm days. An average of 3-5 warm spells was recorded per 10 years. The most numerous warm spells occurred during three winter seasons, i.e. 1989/1990, 2006/2007 and 2015/2016. The occurrence of warm spells was related to positive anomalies of geopotential heights over the study area in the cross section of the entire troposphere. Maximum anomalies appeared at 250 hPa geopotential height, and they developed on average 9 days before the commencement of warm spells over the study area