Models of service, applications and commercial examples of cloud computing

Cilj ovog završnog rada jest detaljnije obraditi pojam računalstva u oblaku, njegove primjene, modele usluga te naposljetku prikazati na temelju komercijalnih primjera računalnu i ekonomsku prednost. Računalstvo u oblaku predstavlja model obrade podataka koji omogućuje brz i jednostavan pristup skupu djeljivih računalnih resursa. Resursi se odnose na sastavnice poput računalnih mreža, poslužiteljskih računala, medija za pohranu podataka, aplikacija te raznih usluga. Organizacije u fazi izgradnje mogu na isplativ način izgraditi računalnu infrastrutkuru za obavljanje poslovanja. Računalstvo u oblaku predstavlja isplativ model usluge bez visokih inicijalnih troškova. Poslije definiranja pojma računalstva u oblaku, njegove strukture te funkcionalnosti, ovaj završni rad bavi se vrstama primjene oblaka i modelima usluga. Detaljno su razrađene vrste primjene kroz privatni, javni, oblak zajednice te hibridni oblak. Modeli usluga odnose se na softver kao uslugu, platformu kao uslugu i infrastrukturu kao uslugu. Rad završava komercijalnim primjerima primjene računalstva u oblaku na primjerima modernih organizacija, odnosno pruţatelja usluga u oblaku. Spomenute su organizacije Amazon.com, Google te GoGrid Cloud. Kroz pojašnjenje zastupljenijih usluga prikazuju se praktične primjene oblaka i prednosti pojedinog proizvoda.The aim of this final thesis is to define in detail the main definition of Cloud Computing, as well as deployment methods and service models, finalizing with commercial examples showing computational and economical value. Cloud Computing is defined as data processing model which enables fast and simple approach to a resource pooling unit. Resources consist of components such as networking, server clients, data storage, applications and other relevant services. Start-up organizations can build a very cost-effective computing infrastructure for their business needs. Cloud Computing is an efficient service model without initial costs. After defining the main Cloud Computing terms such as structure and functionality, this thesis puts focus on deployment methods and service models. Deployment methods are defined in detail through private cloud, public cloud, community cloud and hybrid cloud. Service models are explained through Software as a Service, Platform as a Service and Infrastructure as a Service. Finally, this thesis ends with commercial examples of Cloud Computing, mentioning modern organizations and cloud service providers. Mentioned organizations are Amazon.com, Google and GoGrid Cloud. Practical uses and advantages of cloud computing products are mentioned as well, in simple terms

Models of service, applications and commercial examples of cloud computing

Cilj ovog završnog rada jest detaljnije obraditi pojam računalstva u oblaku, njegove primjene, modele usluga te naposljetku prikazati na temelju komercijalnih primjera računalnu i ekonomsku prednost. Računalstvo u oblaku predstavlja model obrade podataka koji omogućuje brz i jednostavan pristup skupu djeljivih računalnih resursa. Resursi se odnose na sastavnice poput računalnih mreža, poslužiteljskih računala, medija za pohranu podataka, aplikacija te raznih usluga. Organizacije u fazi izgradnje mogu na isplativ način izgraditi računalnu infrastrutkuru za obavljanje poslovanja. Računalstvo u oblaku predstavlja isplativ model usluge bez visokih inicijalnih troškova. Poslije definiranja pojma računalstva u oblaku, njegove strukture te funkcionalnosti, ovaj završni rad bavi se vrstama primjene oblaka i modelima usluga. Detaljno su razrađene vrste primjene kroz privatni, javni, oblak zajednice te hibridni oblak. Modeli usluga odnose se na softver kao uslugu, platformu kao uslugu i infrastrukturu kao uslugu. Rad završava komercijalnim primjerima primjene računalstva u oblaku na primjerima modernih organizacija, odnosno pruţatelja usluga u oblaku. Spomenute su organizacije Amazon.com, Google te GoGrid Cloud. Kroz pojašnjenje zastupljenijih usluga prikazuju se praktične primjene oblaka i prednosti pojedinog proizvoda.The aim of this final thesis is to define in detail the main definition of Cloud Computing, as well as deployment methods and service models, finalizing with commercial examples showing computational and economical value. Cloud Computing is defined as data processing model which enables fast and simple approach to a resource pooling unit. Resources consist of components such as networking, server clients, data storage, applications and other relevant services. Start-up organizations can build a very cost-effective computing infrastructure for their business needs. Cloud Computing is an efficient service model without initial costs. After defining the main Cloud Computing terms such as structure and functionality, this thesis puts focus on deployment methods and service models. Deployment methods are defined in detail through private cloud, public cloud, community cloud and hybrid cloud. Service models are explained through Software as a Service, Platform as a Service and Infrastructure as a Service. Finally, this thesis ends with commercial examples of Cloud Computing, mentioning modern organizations and cloud service providers. Mentioned organizations are Amazon.com, Google and GoGrid Cloud. Practical uses and advantages of cloud computing products are mentioned as well, in simple terms

Thermogravimetric study on the pyrolysis kinetic mechanism of waste biomass from fruit processing industry

The detailed kinetic analysis of slow pyrolysis process of apricot (Prunus armeniaca L.) kernal shells has been estimated, under non-isothermal conditions, through thermogravimetric analysis and derivative thermogravimetry. Thermal decomposition was implemented using four different heating rates (5, 10, 15, and 20 degrees C per minute), with consideration of how this parameter effects on the process kinetics. The higher heating rates provoke the shift of thermoanalytical curves towards more elevated temperatures. Using isoconversional differential method, the variation of activation energy, Ea, with conversion fraction, a, was detected, and pyrolysis reaction profile was discussed. After resolving the pyrolysis rate curves of individual biomass constituents, the temperature and conversion ranges of their thermal transformations were clearly identified. In the latter stage of analysis, every identified reaction step was considered through mechanistic description, which involves selection of the appropriate kinetic model function. The comparison of the results as well as discrepancies between them has been discussed. The corresponding rate-law equations related to thermal decomposition reactions of all biomass constituents present in the tested agricultural waste material have been identified

Thermogravimetric study on the pyrolysis kinetic mechanism of waste biomass from fruit processing industry

The detailed kinetic analysis of slow pyrolysis process of apricot (Prunus armeniaca L.) kernal shells has been estimated, under non-isothermal conditions, through thermogravimetric analysis and derivative thermogravimetry. Thermal decomposition was implemented using four different heating rates (5, 10, 15, and 20 degrees C per minute), with consideration of how this parameter effects on the process kinetics. The higher heating rates provoke the shift of thermoanalytical curves towards more elevated temperatures. Using isoconversional differential method, the variation of activation energy, Ea, with conversion fraction, a, was detected, and pyrolysis reaction profile was discussed. After resolving the pyrolysis rate curves of individual biomass constituents, the temperature and conversion ranges of their thermal transformations were clearly identified. In the latter stage of analysis, every identified reaction step was considered through mechanistic description, which involves selection of the appropriate kinetic model function. The comparison of the results as well as discrepancies between them has been discussed. The corresponding rate-law equations related to thermal decomposition reactions of all biomass constituents present in the tested agricultural waste material have been identified

Thermogravimetric kinetic study of solid recovered fuels pyrolysis

In the Republic of Serbia there are significant quantities of coffee and tire wastes that can be utilized as Solid Recovered Fuel (SRF) and used as an additional fuel for co-combustion with coal and biomass in energy production and cement industry sectors. Differences between SRF and base fuel are a cause of numerous problems in design of burners. The objective of this study was to determine the kinetic parameters for the thermochemical conversion of selected SRF using Simultaneous Thermal Analysis (STA). Samples of coffee and tire waste were used for the experimental tests. Thermal analysis was carried out in nitrogen atmosphere at three different heating rates 10, 15 and 20 K/min for each sample, while it was heated from room temperature up to 900 degrees C. Two sample sizes x lt 0.25 mm and 0.25 lt x lt 0.5 mm of each SRF were used in experiments, in order to obtain reliable Thermal Gravimetric Analysis (TGA) data for estimation of kinetic parameters for SRF pyrolysis. Experimental results were used for determination of pre-exponential factor and activation energy according to methods presented in the literature. Presented research provides valuable data of coffee and tire waste that can be used for the burners design

Application of Blockchain technology in tourism

Blockchain tehnologija jest distribuirana digitalna knjiga koja omogućuje sigurne, transparentne te nepromjenjive transakcije. Razmjena podataka je izravna među sudionicima mreže te nema potrebe za trećom stranom ili posrednicima. Blockchain predstavlja jedinstven spoj drugih tehnologija poput P2P mreže, kriptografskih tehnika, konsenzusnih protokola te distribuiranih digitalnih knjiga. Blockchain tehnologija u turističoj djelatnosti može se primjeniti u smislu disintermedijacije turističkih aktivnosti. Smanjuje se lanac posrednika te dolazi do eliminacije treće strane kod raznih transakcija. Blockchain tehnologija s primjenom u turizmu iz temelja mijenja proizvode i usluge. Cilj ovog diplomskog rada jest prikazati primjenu blockchain tehnologije u turističkoj djelatnosti, a prikazane su mogućnosti upotrebe tehnologije koje se odnose na autonomnost poslovnih transakcija, smanjenje troškova i disintermedijaciju. Primjenom blockchain tehnologije stvaraju se nove poslovne i transakcijske vrijednosti.Blockchain technology is a distributed digital ledger that enables secure, transparent and immutable transactions. Data exchange is direct between network participants and there i sno need for third party intermediaries. Blockchain represents a unique combination of other technologies such as P2P networks, cryptographic techniques, consensus protocols and distributed digital ledgers. Blockchain technology in tourism can be applied in the sense of disintermediation of tourist activities. The chain of intermediaries is reduced and the third party is eliminated in various transactions. Blockchain technology with its application in tourism fundamentally changes products and services. The aim of this thesis is to show the application of blockchain technology in the tourism industry, and the possibilities of using the technology related to the autonomy of business transactions, cost reduction and disintermediation. By applying blockchain technology, new business and transactional values are created

Application of Blockchain technology in tourism

Blockchain tehnologija jest distribuirana digitalna knjiga koja omogućuje sigurne, transparentne te nepromjenjive transakcije. Razmjena podataka je izravna među sudionicima mreže te nema potrebe za trećom stranom ili posrednicima. Blockchain predstavlja jedinstven spoj drugih tehnologija poput P2P mreže, kriptografskih tehnika, konsenzusnih protokola te distribuiranih digitalnih knjiga. Blockchain tehnologija u turističoj djelatnosti može se primjeniti u smislu disintermedijacije turističkih aktivnosti. Smanjuje se lanac posrednika te dolazi do eliminacije treće strane kod raznih transakcija. Blockchain tehnologija s primjenom u turizmu iz temelja mijenja proizvode i usluge. Cilj ovog diplomskog rada jest prikazati primjenu blockchain tehnologije u turističkoj djelatnosti, a prikazane su mogućnosti upotrebe tehnologije koje se odnose na autonomnost poslovnih transakcija, smanjenje troškova i disintermedijaciju. Primjenom blockchain tehnologije stvaraju se nove poslovne i transakcijske vrijednosti.Blockchain technology is a distributed digital ledger that enables secure, transparent and immutable transactions. Data exchange is direct between network participants and there i sno need for third party intermediaries. Blockchain represents a unique combination of other technologies such as P2P networks, cryptographic techniques, consensus protocols and distributed digital ledgers. Blockchain technology in tourism can be applied in the sense of disintermediation of tourist activities. The chain of intermediaries is reduced and the third party is eliminated in various transactions. Blockchain technology with its application in tourism fundamentally changes products and services. The aim of this thesis is to show the application of blockchain technology in the tourism industry, and the possibilities of using the technology related to the autonomy of business transactions, cost reduction and disintermediation. By applying blockchain technology, new business and transactional values are created

Thermogravimetric kinetic study of solid recovered fuels pyrolysis

In the Republic of Serbia there are significant quantities of coffee and tire wastes that can be utilized as Solid Recovered Fuel (SRF) and used as an additional fuel for co–combustion with coal and biomass in energy production and cement industry sectors. Differences between SRF and base fuel are a cause of numerous problems in design of burners. The objective of this study was to determine the kinetic parameters for the thermochemical conversion of selected SRF using Simultaneous Thermal Analysis (STA). Samples of coffee and tire waste were used for the experimental tests. Thermal analysis was carried out in nitrogen atmosphere at three different heating rates 10, 15 and 20 K/min for each sample, while it was heated from room temperature up to 900°C. Two sample sizes x <0.25 mm and 0.25 < x <0.5 mm of each SRF were used in experiments, in order to obtain reliable Thermal Gravimetric Analysis (TGA) data for estimation of kinetic parameters for SRF pyrolysis. Experimental results were used for determination of pre-exponential factor and activation energy according to methods presented in the literature. Presented research provides valuable data of coffee and tire waste that can be used for the burners design

Spectroscopic characterization of YAG and Nd:YAG single crystals

In this paper, we used the Czochralski method to obtain good quality yttrium aluminium garnet (YAG, Y3Al5O12) and yttrium aluminium garnet doped with neodymium (Nd: YAG) crystals. The investigations were based on the growth mechanisms and the shape of the liquid/solid interface crystallization front on the crystal properties and incorporation of Nd3+ ions. The obtained single YAG and Nd: YAG crystals were studied by use of x-ray diffraction, Raman and IR spectroscopy. There are strong metal oxygen vibrations in the region of 650-800 cm(-1) which are characteristics of Al-O bond: peaks at 784/854, 719/763 and 691/707 cm(-1) correspond to asymmetric stretching vibrations in tetrahedral arrangement. Peaks at 566/582, 510/547 and 477/505 cm(-1) are asymmetric stretching vibrations and 453/483 cm(-1) is the symmetric vibration of the Al-O bond in octahedral arrangements of the garnet structure. Lower energy peaks correspond to translation and vibration of cations in different coordinations-tetrahedral, octahedral and dodecahedral in the case of the lowest modes

Optical properties and fluorescence of quantum dots CdSe/ZnS-PMMA composite films with interface modifications

Processing and characterization of polymer nanocomposites based on poly (methyl methacrylate) (PMMA) matrix with embedded core-shell CdSe/ZnS quantum dots (QD's) were presented in this work. The aim is to preserve the optical activity of QD's in nanocomposite processing with improved mechanical properties. The modification of QD's CdSe/ZnS-PMMA interface was achieved with 3-mercaptopropyltrimethoxysilane (MPTMS). Nanocomposites were processed by solution casting. The samples of pure PMMA, and composites with unmodified and silane modified QD's CdSe/ZnS were processed. FTIR analysis revealed modification of QD's with silane and characteristic bonding with PMMA matrix. Raman spectrum confirms a presence of alloyed layer at the core-shell interface. Time-resolved laser induced fluorescence measurements confirmed slight blue shift in QD's CdSe/ZnS-PMMA composite without interface modification, while there was a slight red shift with modified particles. Oxidation effects in quantum dots were removed with the use of PMMA as a host, and the core remained active, which was confirmed with FTIR analysis and time-resolved laser induced fluorescence measurements. © 201