Iskanje po katalogu digitalne knjižnice

Opis: Raziskovanje migracij, kulture, medkulturne komunikacije in integracije posameznikov v tujo kulturo obsegajo številna področja in so prav zaradi svojih razsežnosti in vseprisotnosti vedno znova zanimivi za raziskovanje. Pričujoče diplomsko delo se osredotoča na procese integracije slovenskih izseljencev v Avstraliji in Kanadi, kamor se je že v zgodovini izselilo veliko Slovencev. V delu so predstavljene definicije kulture, komunikacije in medkulturne komunikacije ter migracij. Namen raziskave je bil s pomočjo že obstoječih raziskav ter postavljenih teorij in s pomočjo odgovorov slovenskih izseljencev v Avstraliji in Kanadi pridobiti vpogled v integracijo Slovencev v tujo (avstralsko in kanadsko) kulturo ter ohranjanje slovenske kulture ter pri tem upoštevati delovanje in pomen slovenskih društev.
Ključne besede: Kultura, medkulturna komunikacija, migracija, integracija, Slovenci v Kanadi in Avstraliji
Objavljeno v DKUM: 28.02.2013; Ogledov: 5975; Prenosov: 223
Celotno besedilo (1,32 MB)

Opis: Diplomsko delo opisuje SQL povpraševanja, oziroma napotke, kako ta povpraševanja približati optimizaciji. Bralca vodi od začetka pisanja in predstavitve posameznih SQL stavkov vse do pisanja optimiziranih SQL povpraševanj. Ob tem bralcu predstavi priporočila in metode za dosego le-teh, poleg tega pa mu predstavi še proces same optimizacije. Prav tako mu prikaže posamezne korake optimizacije povpraševanj, tako da jih bralec lahko tudi sam zapiše. Z diplomskim delom želimo ugotoviti, kaj je bistveno pri pisanju SQL povpraševanj za dosego hitro se izvajajočega povpraševanja, ki porabi čim manj vira podatkov.
Ključne besede: SQL povpraševanje, optimizacija SQL povpraševanj, SQL stavki
Objavljeno v DKUM: 04.09.2012; Ogledov: 2848; Prenosov: 258
Celotno besedilo (1,98 MB)

Opis: In the paper, we present an algorithm that can be applied to protect data before a data mining process takes place. The data mining, a part of the knowledge discovery process, is mainly about building models from data. We address the following question: can we protect the data and still allow the data modelling process to take place? We consider the case where the distributions of original data values are preserved while the values themselves change, so that the resulting model is equivalent to the one built with original data. The presented formal approach is especially useful when the knowledge discovery process is outsourced. The application of the algorithm is demonstrated through an example.
Ključne besede: data protection algorithm, classification algorithm, disclosure control, data mining, knowledge discovery, data security
Objavljeno v DKUM: 01.06.2012; Ogledov: 2365; Prenosov: 57
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Opis: Recent progress in hash functions analysis has led to collisions on reduced versions of SHA-256. As in other hash functions, differential collision search methods of SHA-256 can be described by means of conditions on and between state and message bits. We describe a tool for efficient automatic searching of message pairs conforming to useful sets of conditions, i. e. stemming from (interleaved) local collisions. We not only considerably improve upon previous work [7], but also show the extendability of our approach to larger sets of conditions. Furthermore, we present the performance results of an actual implementation and pose an open problem in this context.
Ključne besede: hash functions analysis, messages, SHA-256, automatic searching, differential collision search
Objavljeno v DKUM: 31.05.2012; Ogledov: 1723; Prenosov: 99
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Opis: Remote authentication of users supported by passwords is a broadly adopted method of authentication within insecure network environments. Such protocols typically rely on pre-established secure cryptographic keys or public key infrastructure. Recently, Peyravian and Jeffries [M. Peyravian, C. Jeffries, Secure remote user access over insecure networks, Computer Communications 29 (5-6) (2006) 660-667] proposed a protocol for secure remote user access over insecure networks. Shortly after the protocol was published Shim [K.A. Shim, Security flaws of remote user access over insecure networks, Computer Communications 30 (1) (2006) 117-121] and Munilla et al. [J. Munilla, A. Peinado, Off-line password-guessing attack to Peyravian-Jeffries`s remote user authentication protocol, Computer Communications 30 (1) (2006) 52-54] independently presented an off-line guessing attack on the protocol. Based on their findings we present an improved secure password-based protocol for remote user authentication, password change, and session key establishment over insecure networks, which is immune against the attack.
Ključne besede: networks, user authentication, remote user access, password-based protocol, security
Objavljeno v DKUM: 31.05.2012; Ogledov: 2113; Prenosov: 82
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