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Providing the success of Six Sigma by proper project identification and selection : comparison study between Slovenia and the UK
Dušan Gošnik, Andrej Bertoncelj, 2010, original scientific article

Abstract: Results of Six Sigma projects are related to company performance. Successful Six Sigma projects increase customer satisfaction and have many other positive effects on organisations. Success of Six Sigma projects is related to key management decision about how to identify potential projects and which projects to select for final implementation. This research is oriented toward the study of tools used in the phase of Six Sigma project identification and criteria used in the phase of Six Sigma project selection. The purpose of this research is to compare results from manufacturing sector in Slovenia and the UK. Results of this study indicate that management within the organisations tend to identify potential Six Sigma projects with the use of different tools, such as: brainstorming (Slovenia and UK.), followed by Critical To Quality tree (UK.), and interviews and customer visits (Slovenia). Further, the results show that the final decision about Six Sigma projects selection in the UK and Slovenia include different criteria, such as: customer benefit (Slovenia and UK), finance impact (UK) and connection to business strategy (Slovenia). Many companies in the UK as well in Slovenia combine the use of tools and balanced selection criteria at the same time.
Keywords: Six Sigma, tools, criteria, identification, selection, project, management, Slovenia, United Kingdom
Published in DKUM: 18.01.2018; Views: 1220; Downloads: 210
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Intelligent support for defining aesthetical, ergonomical and material properties of designed product
Jasmin Kaljun, 2014, original scientific article

Abstract: The presented paper gives an insight into a prototype of intelligent advisory system based on the aesthetic and ergonomic factors regarding product design, with emphasis on appurtenant design recommendations. The paper focuses on methodology of determining appropriate combination of ergonomic and aesthetic design actions during product design to achieve pleasant user experience. Along with products' function, ergonomics and aesthetics certainly belong to the most important design factors that affect user experience. In the field of ergonomics not only anthropometrical characteristics of prospective user are important. It is also of significant importance to select appropriate material for contact areas in order to assure comfortable and injury free use. Presented theoretical findings are supported with case study of hand tool handle design using intelligent advisory system Oscar.
Keywords: aesthetics, ergonomics, intelligent support, material selection, product design
Published in DKUM: 12.07.2017; Views: 1022; Downloads: 215
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A question-based design pattern advisement approach
Luka Pavlič, Vili Podgorelec, Marjan Heričko, 2014, original scientific article

Abstract: Design patterns are a proven way to build flexible software architectures. But the selection of an appropriate design pattern is a difficult task in practice, particularly for less experienced developers. In this paper, a question based design pattern advisement approach will be proposed. This approach primarily assists developers in identifying and selecting the most suitable design pattern for a given problem. We will also propose certain extensions to the existing Object-Oriented Design Ontology (ODOL). In addition to the advisement procedure, a new design pattern advisement ontology will be defined. We have also developed a tool that supports the proposed ontology and question-based advisement (OQBA) approach. The conducted controlled experiment and two surveys have shown that the proposed approach is beneficial to all software developers, especially to those who have less experience with design patterns.
Keywords: design patterns, pattern selection, ontology, semantic web, selection algorithm
Published in DKUM: 06.07.2017; Views: 1549; Downloads: 410
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Leaders should not be conformists in evolutionary social dilemmas
Attila Szolnoki, Matjaž Perc, 2016, original scientific article

Abstract: The most common assumption in evolutionary game theory is that players should adopt a strategy that warrants the highest payoff. However, recent studies indicate that the spatial selection for cooperation is enhanced if an appropriate fraction of the population chooses the most common rather than the most profitable strategy within the interaction range. Such conformity might be due to herding instincts or crowd behavior in humans and social animals. In a heterogeneous population where individuals differ in their degree, collective influence, or other traits, an unanswered question remains who should conform. Selecting conformists randomly is the simplest choice, but it is neither a realistic nor the optimal one. We show that, regardless of the source of heterogeneity and game parametrization, socially the most favorable outcomes emerge if the masses conform. On the other hand, forcing leaders to conform significantly hinders the constructive interplay between heterogeneity and coordination, leading to evolutionary outcomes that are worse still than if conformists were chosen randomly. We conclude that leaders must be able to create a following for network reciprocity to be optimally augmented by conformity. In the opposite case, when leaders are castrated and made to follow, the failure of coordination impairs the evolution of cooperation.
Keywords: cooperation, public goods, selection, physics of social systems
Published in DKUM: 23.06.2017; Views: 825; Downloads: 391
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Evolution of conditional cooperation under multilevel selection
Huanren Zhang, Matjaž Perc, 2016, original scientific article

Abstract: We study the emergence of conditional cooperation in the presence of both intra-group and inter-group selection. Individuals play public goods games within their groups using conditional strategies, which are represented as piecewise linear response functions. Accordingly, groups engage in conflicts with a certain probability. In contrast to previous studies, we consider continuous contribution levels and a rich set of conditional strategies, allowing for a wide range of possible interactions between strategies. We find that the existence of conditional strategies enables the stabilization of cooperation even under strong intra-group selection. The strategy that eventually dominates in the population has two key properties: (i) It is unexploitable with strong intra-group selection; (ii) It can achieve full contribution to outperform other strategies in the inter-group selection. The success of this strategy is robust to initial conditions as well as changes to important parameters. We also investigate the influence of different factors on cooperation levels, including group conflicts, group size, and migration rate. Their effect on cooperation can be attributed to and explained by their influence on the relative strength of intra-group and inter-group selection.
Keywords: conditional cooperation, public goods, multilevel selection, physics of social systems
Published in DKUM: 23.06.2017; Views: 907; Downloads: 373
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8.
Outsourcing of logistics activities in manufacturing industry
Anton Ogorelc, Klavdij Logožar, 2001, original scientific article

Abstract: The external supply of logistics services is part of a trend toward outsourcing non-core logistics activities. The scope of third-party logistics may range from a relatively limited combination of activities (e.g. transportation and warehousing) to a comprehensive set of logistics services. The authors first discuss the characteristics of business logistics in manufactoring industry, to be taken into account in logistics outsourcing. They particularly point out the motivations for logistics outsourcing, the possibilities of outsourcing, as well as supplier selection. Finally they analyze the outsourcing in the reverse logistics.
Keywords: outsourcing, logistic services, business logistics, supplier selection, reverse logistics
Published in DKUM: 05.06.2017; Views: 1083; Downloads: 186
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Development of a part-complexity evaluation model for application in additive fabrication technologies
Bogdan Valentan, Tomaž Brajlih, Igor Drstvenšek, Jože Balič, 2011, original scientific article

Abstract: 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.
Keywords: rapid prototyping, STl, complexity, shape, layered technology, technology selection
Published in DKUM: 10.07.2015; Views: 1525; Downloads: 98
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10.
Concept and design of electric car body
Marko Sovič, 2012, undergraduate thesis

Abstract: In this thesis, a concept multi-material body for an electric vehicle is presented. A selection criteria for materials is made with regard to component function, their traditional shape and the mode of load they have to carry. Initial component design is based on a vehicle reference model. Numerous component modifications are done in dependence on the chosen materials and their production processes. Special attention is payed to the electric vehicle's body structural changes that need to be performed due to the passenger and battery safety. A program for distance simulation is made and used to evaluate cost changes, on a whole vehicle scale, when performing mass-reduction in a vehicle body. It has been proven that it is justified to use light materials.
Keywords: body-in-white, electric vehicle, material selection, Catia V5, distance simulation, cost analysis.
Published in DKUM: 07.03.2013; Views: 1742; Downloads: 187
.pdf Full text (7,79 MB)

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