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Editorial: The physics of cities
Fabiano L. Ribeiro, Matjaž Perc, Haroldo V. Ribeiro, 2022, predgovor, uvodnik, spremna beseda

Ključne besede: smart city, complexity, social physics
Objavljeno v DKUM: 25.07.2023; Ogledov: 372; Prenosov: 32
.pdf Celotno besedilo (533,02 KB)
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Systems approach to tourism : a methodology for defining complex tourism system
Tadeja Jere Lazanski, 2017, izvirni znanstveni članek

Opis: Background and Purpose: The complexity of the tourism system, as well as modelling in a frame of system dynamics, will be discussed in this paper. The phaenomenon of tourism, which possesses the typical properties of global and local organisations, will be presented as an open complex system with all its elements, and an optimal methodology to explain the relations among them. The approach we want to present is due to its transparency an excellent tool for searching systems solutions and serves also as a strategic decision-making assessment. We will present systems complexity and develop three models of a complex tourism system: the first one will present tourism as an open complex system with its elements, which operate inside of a tourism market area. The elements of this system present subsystems, which relations and interdependencies will be explained with two models: causal-loop diagram and a simulation model in frame of systems dynamics. Design/methodology/approach: Systems methodology will be shown as the appropriate one, when we discuss complex systems challenges. For illustration, systems approach and systems methodology will be applied to tourism models. With building a qualitative causal-loop diagram we will describe the tourism system complexity in forms of system%s elements relations. Mutual influences among the elements will be presented with positive and negative loops, which forms circles of reinforcement and balance. This will help us to discuss the problem categorically. The final model will follow the causal-loop diagram. This will be a simulation model in a frame of system dynamics as an illustration of the discussed methodology. Results: The methodology offers the solution of effective and holistic promotion of complex tourism system transformation, which has the potential to go beyond the myth of sustainable tourism and create significant shifts in the approach and acting of the participants (elements of the system) involved. Systems approach brings to tourism and the society, in general, broader dimensions of thinking, the awareness interdependency, interconnectivity, and responsibility for the behaviour of a system, which can be observed by feedback loops. Conclusions: Findings about meaningfulness of systems thinking presented in the paper, are rarely presented to tourism society systemically and with the aim of designing sustainable complex tourism system. They show new approach, systems awareness and teaches thinking %out of the box%. Consequently, the sustainable behaviour is achieved: tourism supply and demand meet on responsible base and they connect to responsible stakeholders.
Ključne besede: systems approach, complexity, tourism system, modelling, system dynamics
Objavljeno v DKUM: 22.01.2018; Ogledov: 1006; Prenosov: 201
.pdf Celotno besedilo (625,68 KB)
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Organisational effectiveness and customer satisfaction
Milan Ambrož, Martina Praprotnik, 2008, izvirni znanstveni članek

Opis: This paper presents a test of the relationship between organizational culture as a crucial indicator of organizational effectiveness and customer satisfaction using service-unit data from two health resorts. Ensuring survival of the service organisation in the long run requires adaptations which are oriented towards achieving maximum customer satisfaction. This study intended to unveil the effect organisational factors have on customer service orientation from the customer and employee point of view within a two health resort service setting. The finding suggests that when trying to predict the comparative degree which organisational effectiveness factors have in satisfying customers' needs, performance, adaptability and mission can be of the highest importance. Some effects like performance were uniform for employees and customers, while others varied depending on the organisation and the customer or employee group. Furthermore, findings suggest that service performance and organisation mission of the service organisation predict customer satisfaction based on established and proven health services. In this context there is no room for innovation, despite the fact that employees and customers do not share similar views about the impact of organisational effectiveness. Developing an effective service organisation can provide a competitive advantage to the organisation. Critical for the success of the service organisation is that organisational agents have a clear view of the existing organisation effectiveness and a clear view of the customer expectations in this area.
Ključne besede: organisational effectiveness, customer satisfaction, customer complexity, service orientation, survival, adaptability
Objavljeno v DKUM: 04.12.2017; Ogledov: 1516; Prenosov: 409
.pdf Celotno besedilo (982,16 KB)
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Multiple paradigm research on organisational culture : an introduction of complexity paradigm
Dan Podjed, 2011, izvirni znanstveni članek

Opis: The author presents multiple paradigm research into the organisational culture of a birdwatching association, where he conducted his ethnographic research. On top of the functionalist, interpretive, radical structuralist and radical humanist paradigms as presented by Gibson Burrell and Gareth Morgan, he applies the fifth paradigm into the analysis of the organisation. The so-called complexity paradigm, which was formed in 1980's based on findings about complex systems and networks that emerged in natural and social sciences, summarizes all other paradigms, integrating them into a coherent unit. According to the author, the approach that exploits the benefits of each previously known paradigm illustrates comprehensively the complexity of organisational cultures, whereas the new paradigm upgrades our previous knowledge on organisations.
Ključne besede: anthropology, organisational culture, multiple paradigm research, complexity paradigm, ornithological association
Objavljeno v DKUM: 04.12.2017; Ogledov: 987; Prenosov: 145
.pdf Celotno besedilo (1,05 MB)
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Strong edge geodetic problem in networks
Paul Manuel, Sandi Klavžar, Antony Xavier, Andrew Arokiaraj, Elizabeth Thomas, 2017, izvirni znanstveni članek

Opis: Geodesic covering problems form a widely researched topic in graph theory. One such problem is geodetic problem introduced by Harary et al. Here we introduce a variation of the geodetic problem and call it strong edge geodetic problem. We illustrate how this problem is evolved from social transport networks. It is shown that the strong edge geodetic problem is NP-complete. We derive lower and upper bounds for the strong edge geodetic number and demonstrate that these bounds are sharp. We produce exact solutions for trees, block graphs, silicate networks and glued binary trees without randomization.
Ključne besede: geodetic problem, strong edge geodetic problem, computational complexity, transport networks
Objavljeno v DKUM: 03.11.2017; Ogledov: 1046; Prenosov: 431
.pdf Celotno besedilo (657,86 KB)
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Quantifying soil complexity using network models of soil porous structure
Marko Samec, A. Santiago, J. P. Cardenas, R. M. Benito, A. M. Tarquis, Sacha Jon Mooney, Dean Korošak, 2013, izvirni znanstveni članek

Opis: This paper describes an investigation into the properties of spatially embedded complex networks representing the porous architecture of soil systems. We suggest an approach to quantify the complexity of soil pore structure based on the node-node link correlation properties of the networks. We show that the complexity depends on the strength of spatial embedding of the network and that this is related to the transition from a non-compact to compact phase of the network.
Ključne besede: soil complexity, soil pore networks, complex systems
Objavljeno v DKUM: 21.07.2017; Ogledov: 1325; Prenosov: 323
.pdf Celotno besedilo (3,85 MB)
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The Complexity of Cryptography in Literature
Sonja Sedej, 2016, magistrsko delo

Opis: Cryptography first appeared approximately four thousand years ago; it has developed and improved throughout history. Cryptography has an important role in the modern world. Cryptography has been a part of our lives for nearly four thousand years; nevertheless, the first book on cryptography did not appear until 1499, when John Tritheim published a collection of codes used in some European courts. Today, cryptography affects us in many seen and unseen forms and shapes. Therefore, I am not surprised to see that it is commonplace in fiction. The purpose of this thesis is not to study the light summer reading that has lately filled the bookshelves, but to systematically research the complexity of cryptography in different literary genres. In The Complexity of Cryptography in Literature, I analyze cryptography in English literature throughout the past two centuries. My thesis is, for many reasons, written in English; the study of English and American Literature, an English speaking mentor and researching literature written in English. Using analysis and synthesis I study two secondary theoretical sources, Codes and Ciphers – A History of Cryptography written by Alexander D'Agapeyeff and Codes, Ciphers and Secret Writing written by Martin Gardner. At the same time I introduce the appropriate terminology which is necessary for further understanding. The thesis summarizes and presents the history of cryptography. The latter is researched using the method of analysis and synthesis in The Code Book by Simon Sing and The Code-Breakers by David Kahn. Using the basic methods and history of cryptography, I will show that many methods of cryptography are described in literature; these are closely related to cryptography’s historical development. Furthermore, I propose that these methods are used in a wide spectra of literary genres; at the same time I will show that mostly simple or simplified methods of cryptography are used in literature; otherwise, they would not be accessible to the average reader. The thesis analyzes the complexity of cryptography in six different works of literature with reference to standard mathematical models of cryptography. I analyze the above mentioned works of literature, and using classification and mathematical methods, I process and present the appearance of cryptography in individual works (the methods and their correctness); then, using historical and comparative methods, I research the relationship between cryptographic methods used in literature and actual historical use of cryptography. Further on, I use various methods (the mathematical method, the method of analysis and synthesis, the method of interpretation, and the descriptive method) to present the complexity of cryptographic methods in literature.
Ključne besede: cryptography, code, cipher, complexity, fiction
Objavljeno v DKUM: 26.08.2016; Ogledov: 2127; Prenosov: 156
.pdf Celotno besedilo (2,49 MB)

Development of a part-complexity evaluation model for application in additive fabrication technologies
Bogdan Valentan, Tomaž Brajlih, Igor Drstvenšek, Jože Balič, 2011, izvirni znanstveni članek

Opis: Klasičnim odrezovalnim postopkom so se v zadnjih letih pridružili tako imenovani dodajalni postopki (slojevite tehnologije ali po domače 3D-tiskalniki). Če smo še pred leti vsaj okvirno vedeli kateri postopek izbrati za kateri izdelek, pa danes, ob upoštevanju vedno širše palete slojevitih tehnologij, temu ni več tako in le redki posamezniki še zmorejo slediti razvoju na tem izredno živahnem in hitro rastočem področju. Predstavljen je način določanja kompleksnosti izdelka na osnovi 3D-modela in uporaba izračuna pri izbiri izdelovalnega postopka ter določanju časa poobdelave pri določenih slojevitih tehnologijah. Članek opisuje osnovne značilnosti formata STL kot izhodne CAD-datoteke, ki predstavlja osnovo za analizo in razvoj postopkov določanja kompleksnosti oblike samega modela. Predstavljenih je več modelov iz realnega okolja, na katerih je izvedena analiza vhodnih podatkov in postopek določanja kompleksnosti oblike. Predstavljeni so aktualni izdelovalni postopki, primerni tako za izdelavo unikatnih izdelkov kot tudi za serijsko izdelavo, s posebnim poudarkom na slojevitih tehnologijah. Na osnovi temeljnih lastnosti izdelovalnih tehnologij so analizirani testni modeli in s pomočjo ocene kompleksnosti določeni primerni postopki izdelave oziroma čas, potreben za poobdelavo posameznega izdelka, izdelanega po postopkih slojevitih tehnologij. Rezultati so primerljivi z izkustveno določitvijo izdelovalnega postopka na osnovi ocene strokovnjakov, tako da je ob manjših dodelavah metoda tudi praktično uporabna. Sistem dokaj natančno izloči modele, ki jih je moč izdelati po postopku struženja, prav tako je ustrezno določena meja za uporabo rezkalnega stroja. Pri slojevitih tehnologijah enoznačno izbiro omejuje dejstvo, da te tehnologije v večini primerov omogočajo izdelavo izdelkov ne glede na njihovo kompleksnost. Izbira se je tako omejila na dve skupini, in sicer slojevite tehnologije, pri katerih je potreben dodaten podporni material, in slojevite tehnologije, pri katerih podporni material ni potreben, oziroma ga je mogoče reciklirati. Pri izbiri izdelovalnega postopka bi, ob upoštevanju določenih dodatnih omejitev posameznih slojevitih tehnologij, bila mogoča natančnejša izbira glede na kriterije, kot so čas izdelave, proizvodni stroški, material idr., vendar bi to zahtevalo aktualno bazo podatkov o samih postopkih. Sam način izračuna je bil izbran zaradi razmeroma preprostega izračuna in dokaj natančnega določanja kompleksnosti. Uporaba kompleksnosti za določanje izdelovalnega postopka pred tem ni bila raziskana. S problemom določanja časa poobdelave se danes srečujemo pri praktično vseh slojevitih tehnologijah, ta dejavnik pa bistveno vpliva tako na celoten čas izdelave kot tudi na ceno izdelka. Predstavljena rešitev omogoča izračun časa poobdelave na uporabniku razumljiv način in ob upoštevanju individualnih vplivov specifične naprave s preprosto primerjalno metodo glede na čas poobdelave testnih modelov.
Ključne besede: rapid prototyping, STl, complexity, shape, layered technology, technology selection
Objavljeno v DKUM: 10.07.2015; Ogledov: 1525; Prenosov: 98
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On the packing chromatic number of Cartesian products, hexagonal lattice, and trees
Boštjan Brešar, Sandi Klavžar, Douglas F. Rall, 2007, izvirni znanstveni članek

Opis: Pakirno kromatično število ▫$chi_{rho}(G)$▫ grafa ▫$G$▫ je najmanjše število ▫$k$▫, tako da lahko množico vozlišč grafa ▫$G$▫ razbijemo v pakiranja s paroma različnimi širinami. Dobljenih je več spodnjih in zgornjih meja za pakirno kromatično število kartezičnega produkta grafov. Dokazano je, da pakirno kromatično število šestkotniške mreže leži med 6 in 8. Optimalne spodnje in zgornje meje so dokazane za subdividirane grafe. Obravnavana so tudi drevesa ter vpeljana monotona barvanja.
Ključne besede: matematika, teorija grafov, pakirno kromatično število, kartezični produkt grafov, šestkotniška mreža, subdividiran graf, drevo, računska zahtevnost, mathematics, graph theory, packing chromatic number, Cartesian product of graphs, hexagonal lattice, subdivision graph, tree, computational complexity
Objavljeno v DKUM: 10.07.2015; Ogledov: 1203; Prenosov: 154
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Spatial rotation and recognizing emotions : gender related differences in brain activity
Norbert Jaušovec, Ksenija Jaušovec, 2008, izvirni znanstveni članek

Opis: In three experiments, gender and ability (performance and emotional intelligence) related differences in brain activity - assessed with EEG methodology - while respondents were solving a spatial rotation tasks and identifying emotions in faces were investigated. The most robust gender related difference in brain activity was observed in the lower-2 alpha band. Males and females displayed an inverse IQ-activation relationship in just that domain in which they usually perform better: females in the emotional intelligence domain, and males in the visuospatial ability domain. A similar pattern of brain activity could also be observed for the male/female respondents with different levels of performance and emotional IQ. It was suggested that high ability representatives of both genders to some extent compensate for their inferior problem solving skills (males in emotional tasks and females in spatial rotation tasks) by increasing their level of attention.
Ključne besede: psychology, cognitive processes, emotional intelligence, EEG activities, problem complexity, brain, memory, spatial rotation, gender, event-related desynchronization
Objavljeno v DKUM: 07.06.2012; Ogledov: 2433; Prenosov: 75
URL Povezava na celotno besedilo

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