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1.
Okoljski odtis nekaterih poljščin in zelenjadnic v različnih pridelovalnih sistemih
Maja Turinek, 2009, diplomsko delo

Opis: Intenzivno industrijsko kmetijstvo kot drugi največji onesnaževalec okolja je vedno bolj podvržen pritisku javnosti, ki zahteva trajnosten način kmetijske pridelave. Indikatorjev za oceno trajnosti pridelovalnega sistema (PS) kot celote ni. Cilj diplomskega dela je bil zasnova ter ocenitev orodja za vrednotenje trajnosti pridelave poljščin (pšenica, pira in oljne buče) in zelenjadnic (zelje in rdeča pesa) v štirih PS (konvencionalni — KON, integrirani — INT, ekološki — EKO in biološko dinamični — BD), s podatki poljskega poskusa na FKBV v sezoni 2008. Sustainable Process Index ® (SPI) za kmetijstvo preračuna okoljski odtis vseh direktnih in indirektnih porabljenih osnovnih sredstev tekom pridelave v m2. Analiza je pokazala, da so razlike med PS velike, delni rezultati okoljskega odtisa nakazujejo na mesta potrebna izboljšav tekom pridelave. Okojski odtis je bil pri vseh opazovanih kulturnih rastlinah največji v KON (skupno 3.005.108,9 m2) in najmanjši pri kontrolnem (642.906,2 m2), referenčnem PS. Največji okoljski odtis je imela pšenica v KON (792.646,8 m2) in najmanjši oljne buče v kontrolnem (113.334,7 m2) PS. Izračunan indeks okoljske učinkovitosti (okoljski odtis na enoto pridelka — kg) je trend SPI v večini potrdil. SPI je dobro in dostopno orodje za prikaz trajnosti in pomanjkljivosti PS tako za pridelovalce, javnost kot akterje politike.
Ključne besede: okoljski odtis, pridelovalni sistemi, pridelava poljščin, pridelava zelenjadnic, Sustainable Process index ® - SPI
Objavljeno: 20.10.2009; Ogledov: 2245; Prenosov: 335
.pdf Polno besedilo (431,56 KB)

2.
How to compare companies on relevant dimensions of sustainability
Damjan Krajnc, Peter Glavič, 2005, izvirni znanstveni članek

Opis: Dozens of frameworks of sustainability assessment that focus on the performance of companies have been suggested by now. They propose using numerous sustainability indicators, which are generally measured in very different units. While it is important to assess sustainability with several indicators, it may sometimes be difficult to make comparisons among companies based on a large number of performance measurements. This paper presents a model for designing a composite sustainable development index that depicts performance of companies along all the three dimensions of sustainability-economic, environmental, and societal. In the first part of thepaper, the procedure of calculating the index that would enable comparisonsof companies in specific sector regarding sustainability performance is presented. However, the emphasis of the paper is on the second part, where the effectiveness of the proposed model is illustrated with a casestudy in which two companies from specific sector are compared regarding their sustainability performance.
Ključne besede: chemical industries, sustainable development, sustainability indicators, composed index, sustainability assessment
Objavljeno: 01.06.2012; Ogledov: 815; Prenosov: 3
URL Polno besedilo (0,00 KB)

3.
Neural network based manufacturability evaluation of free form machining
Marjan Korošec, Jože Balič, Janez Kopač, 2005, izvirni znanstveni članek

Opis: Most CAD/CAM and computer-aided process planning systems manipulate all geometrical features on the part equally. In the area of free form machining, lack of efficient methodology for assessing the degree of manufacturing pretentiousness of free form features is still noticeable. Developing this methodology inside CAD/CAM systems brings the following benefits to the tool shop praxis: it minimizes the number of set-ups and tool changes and at the same time ensures the right sequence of machining strategies in order to achieve the best possible surface quality in the machining area. Based on this assessment, the CAD/CAM process will also be greatly simplified. When there are an increased number of non-prismatic and non-cylindrical features, this problem is even more exaggerated, and its solution cannot be found in the framework of analytical mathematics. This paper reports a neuro-fuzzy model that uses the concept of "feature manufacturability" to identify and recognize the degree of "pretentiousness-difficulty of machining". The model is created by means of the construction of parametric fuzzy membership functions, based on neural networks learning process. This makes possible simultaneous evaluation of features complexity in a CAD model and manufacturing capability in an environment description model.
Ključne besede: index of machining complexity
Objavljeno: 01.06.2012; Ogledov: 476; Prenosov: 2
URL Polno besedilo (0,00 KB)

4.
A model for integrated assessment of sustainable development
Damjan Krajnc, Peter Glavič, 2005, izvirni znanstveni članek

Opis: The focus of the paper is on consideration of how to use indicators to monitor sustainable development in a relevant and useful manner. Integrated information on sustainable development of a company is very essential for decision-making since it is very difficult to evaluate the performance of the company on the ground of too many indicators. The objective of the work was to design a model for obtaining a composite sustainable development index (ICSD) in order to track integrated information on economic, environmental, and social performance of the company with time. Normalized indicators were associated into three sustainability sub-indices and finally composed into an overall indicator of a company performance. This was applied by determining the impact of individual indicator to the overall sustainability of a company using the concept of analytic hierarchy process. The demonstration of the model used data for a case study company, Henkel, and a set of sustainable development indicators that were classified using the currently most widely accepted approach of the Global Reporting Initiative (GRI). Case study was used to measure ICSD and sustainability sub-indices of the company over the time interval of 6 years. Interpretation of results is given and the utility of ICSD with its relevance for decision-making is pointed out. Using a case study, the paper demonstrates that the model can be applied to deliver composite indicators of sustainability performance of companies.
Ključne besede: clean technologies, environmental protection, sustainable development, sustainability indicators, composite index, sustainability assessment, multiattribute decision-making
Objavljeno: 01.06.2012; Ogledov: 1060; Prenosov: 8
URL Polno besedilo (0,00 KB)

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Computing quadratic entropy in evolutionary trees
Matt DeVos, Arne Ø. Mooers, Drago Bokal, Sandi Klavžar, Aki Mimoto, 2011

Opis: We note here that quadratic entropy, a measure of biological diversity introduced by Rao, is a variant of the weighted Wiener index, a graph invariant intensively studied in mathematical chemistry. This fact allows us to deduce some efficient algorithms for computing the quadratic entropy in the case of given tip weights, which may be useful for community biodiversity measures. Furthermore, on ultrametric phylogenetic trees, the maximum of quadratic entropy is a measure of pairwise evolutionary distinctness in conservation biology, introduced by Pavoine. We present an algorithm that maximizes this quantity in linear time, offering a significant improvement over the currently used quadratic programming approaches.
Ključne besede: teorija grafov, evolucijsko drevo, filogenetsko drevo, Wienerjev indeks, graph theory, evolutionary tree, phylogenetic tree, quadratic entropy, originality, distinctness, Wiener index
Objavljeno: 10.07.2015; Ogledov: 152; Prenosov: 1
URL Polno besedilo (0,00 KB)

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On the canonical metric representation, average distance, and partial Hamming graphs
Sandi Klavžar, 2006, izvirni znanstveni članek

Opis: Povprečna razdalja grafa je izražena s pomočjo kanonične metrične reprezentacije. Enakost lahko preoblikujemo v neenakost tako, da karakterizira izometrične podgrafe Hammingovih grafov. Ta pristop poenostavlja prepoznavanje teh grafov ter izračun povprečne razdalje.
Ključne besede: matematika, teorija grafov, kanonična metrična reprezentacija, Hammingovi grafi, delni Hammingovi grafi, Wienerjev indeks, algoritem prepoznavanja, mathematics, graph theory, cononical metric representation, Hamming graphs, partial Hamming graphs, Wiener index, recognition algorithm
Objavljeno: 10.07.2015; Ogledov: 179; Prenosov: 4
URL Polno besedilo (0,00 KB)

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