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1.
K-vertex: a novel model for the cardinality constraints enforcement in graph databases : doctoral dissertation
Martina Šestak, 2022, doktorska disertacija

Opis: The increasing number of network-shaped domains calls for the use of graph database technology, where there are continuous efforts to develop mechanisms to address domain challenges. Relationships as 'first-class citizens' in graph databases can play an important role in studying the structural and behavioural characteristics of the domain. In this dissertation, we focus on studying the cardinality constraints mechanism, which also exploits the edges of the underlying property graph. The results of our literature review indicate an obvious research gap when it comes to concepts and approaches for specifying and representing complex cardinality constraints for graph databases validated in practice. To address this gap, we present a novel and comprehensive approach called the k-vertex cardinality constraints model for enforcing higher-order cardinality constraints rules on edges, which capture domain-related business rules of varying complexity. In our formal k-vertex cardinality constraint concept definition, we go beyond simple patterns formed between two nodes and employ more complex structures such as hypernodes, which consist of nodes connected by edges. We formally introduce the concept of k-vertex cardinality constraints and their properties as well as the property graph-based model used for their representation. Our k-vertex model includes the k-vertex cardinality constraint specification by following a pre-defined syntax followed by a visual representation through a property graph-based data model and a set of algorithms for the implementation of basic operations relevant for working with k-vertex cardinality constraints. In the practical part of the dissertation, we evaluate the applicability of the k-vertex model on use cases by carrying two separate case studies where we present how the model can be implemented on fraud detection and data classification use cases. We build a set of relevant k-vertex cardinality constraints based on real data and explain how each step of our approach is to be done. The results obtained from the case studies prove that the k-vertex model is entirely suitable to represent complex business rules as cardinality constraints and can be used to enforce these cardinality constraints in real-world business scenarios. Next, we analyze the performance efficiency of our model on inserting new edges into graph databases with varying number of edges and outgoing node degree and compare it against the case when there is no cardinality constraints checking. The results of the statistical analysis confirm a stable performance of the k-vertex model on varying datasets when compared against a case with no cardinality constraints checking. The k-vertex model shows no significant performance effect on property graphs with varying complexity and it is able to serve as a cardinality constraints enforcement mechanism without large effects on the database performance.
Ključne besede: Graph database, K-vertex cardinality constraint, Cardinality, Business rule, Property graph data model, Property graph schema, Hypernode, Performance analysis, Fraud detection, Data classification
Objavljeno v DKUM: 10.08.2022; Ogledov: 615; Prenosov: 72
.pdf Celotno besedilo (3,43 MB)

2.
ODGOVORNOST ZA NEPRAVOČASNI STEČAJ GOSPODARSKE DRUŽBE KOT POSLEDICA PONAREDITVE PODATKOV LETNEGA POROČILA Z VIDIKA ZAHTEV PRAVA EU
Katarina Moravec, 2016, magistrsko delo

Opis: Insolventnost gospodarske družbe je stanje, za katerega pravo zahteva sprejem ustreznih ukrepov, kot so finančna reorganizacija, prisilna poravnava ali stečaj. Organi vodenja in nadzora so dolžni stanje insolventnosti zaznati dovolj zgodaj, nato pa brez nepotrebnega odlašanja nadaljevati z ukrepi, s katerimi zagotovijo stabilno finančno poslovanje gospodarske družbe. Namen hitrega delovanja je v varstvu interesov upnikov, saj lahko prav ti zaradi zavlačevanja sprejema prepotrebnih ukrepov izgubijo največ. Stanje insolventnosti gospodarske družbe, kot ga določa 14. člen Zakona o finančnem poslovanju, postopkih zaradi insolventnosti in prisilnem prenehanju (v nadaljevanju: ZFPPIPP) se zazna najkasneje ob sestavi letnega poročila, kot enega najpomembnejših korporacijskopravnih aktov vsake gospodarske družbe in podjetnika. Na podlagi tega se lahko ugotovi zadolženost (prezadolženost) gospodarske družbe, strukturo dolgov, zavarovanja, kot tudi realno vrednost premoženja gospodarske družbe. Generalna klavzula v prvem odstavku 61. člena Zakona o gospodarskih družbah (v nadaljevanju: ZGD-1) zahteva, da je letno poročilo sestavljeno jasno in pregledno ter da izkazuje resničen in pošten prikaz premoženja in obveznosti gospodarske družbe, njenega finančnega položaja ter poslovnega izida. Če so podatki v letnem poročilu ponarejeni tako, da izkazujejo boljše premoženjsko stanje od dejanskega, se stanje insolventnosti ne zazna. Posledično to pomeni, da do pravočasnega sprejema ustreznih ukrepov, kot jih za primer insolventnosti gospodarske družbe določa ZFPPIPP ne pride, kar prinese odgovornost članov organov vodenja in nadzora. Zavlačevanje s predlaganjem stečaja je predvsem v interesu lastnikov gospodarske družbe, ki z odlaganjem pridobijo možnost, da iz gospodarske družbe umaknejo lastna sredstva in ustanovijo novo gospodarsko družbo, s čimer oškodujejo predvsem svoje upnike.
Ključne besede: finančno poslovanje gospodarske družbe, business judgement rule, letno poročilo, harmonizacija bilančnega prava, ponarejanje podatkov letnega poročila, insolventnost, nepravočasni stečaj, odgovornost članov organov vodenja in nadzora, stečajni upravitelj, revizor.
Objavljeno v DKUM: 06.03.2017; Ogledov: 2014; Prenosov: 179
.pdf Celotno besedilo (642,46 KB)

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