Search results for "TJ"
showing 10 items of 841 documents
A System-based View of Blockchain Governance
2023
Abstract CONTEXT Governance is crucial in achieving the success and sustainability of blockchain systems. However, blockchain governance is multi-faceted, complex, dynamic, and challenging due to its decentralized nature and automatically enforced rules and mechanisms. OBJECTIVES This study aims to advance the theory of blockchain governance and support practitioners to deepen the researchers’ and practitioners’ understanding of blockchain governance. METHODS The study is a systematic literature review of 75 articles that applies systems theory to conceptualize blockchain governance as a system and parsimoniously organize its interrelated elements into a conceptual model. RESULTS The paper …
Incentive Mechanism for Edge-Computing-Based Blockchain
2020
Blockchain has been gradually applied to different Internet of Things (IoT) platforms. As the efficiency of the blockchain mainly depends on the network computing capability, how to make sure the acquisition of the computational resources and participation of the devices would be the driving force. In this work, we focus on investigating incentive mechanism for rational miners to purchase the computational resources. A edge computing-based blockchain network is considered, where the edge service provider (ESP) can provide computational resources for the miners. Accordingly, we formulate a two-stage Stackelberg game between the miners and ESP. The aim is to investigate Stackelberg equilibriu…
Initial Coin Offering (ICO) as a Fundraising Strategy : A Multiple Case Study on Success Factors
2019
Cryptocurrencies and Initial Coin Offerings (ICO) are some of the more prominent examples of currently used blockchain technology applications. Especially software startups have leveraged ICOs to gain funding early on in their lifecycles, going on to develop and create new blockchain based applications. Recently, larger companies such as Facebook have also begun to show interest in cryptocurrency, although thus far not for funding purposes in the form of ICOs. In this paper, we investigate factors that positively affect the abilities of companies to meet their fundraising goals via ICOs. We first identify a set of factors from extant literature and then seek to further confirm the effect of…
A Survey on Technologies Which Make Bitcoin Greener or More Justified
2022
According to recent estimates, one bitcoin transaction consumes as much energy as 1.5 million Visa transactions. Why is bitcoin using so much energy? Most of the energy is used during the bitcoin mining process, which serves at least two significant purposes: a) distributing new cryptocurrency coins to the cryptoeconomy and b) securing the Bitcoin blockchain ledger. In reality, the comparison of bitcoin transactions to Visa transactions is not that simple. The amount of transactions in the Bitcoin network is not directly connected to the amount of bitcoin mining power nor the energy consumption of those mining devices; for example, it is possible to multiply the number of bitcoin transactio…
UML Artefacts for a Blockchain-enabled Platform for Fairtrade
2021
Fairtrade-certified products have successfully entered the mainstream distribution channels mostly in developed countries, and these products are now sold in famous supermarket chains. Nonetheless, the packaging and labeling of products as “Fairtrade” commands premium pricing in the marketplace. How much of this, however, is valid and justified? Despite the reputable certification mechanisms for quality assurance, mass media reports suggest that much of the “surplus value” goes to the accreditation agencies themselves instead of the producers. This article proposes an agenda to set this right with a blockchain platform that provides “trust-free” assurances of verifiable labeling. Using an A…
Bitcoinin historiallinen kehitys vuosina 2008-2018
2018
Kryptovaluutta Bitcoinista on kasvanut sen kymmenvuotisen historiansa aikana merkittävä vaihtoehtoisvaluutta, joka on saanut aikaan valtavan, globaalin ilmiön. Ihmiset, yritykset eivätkä yhteiskunnat kuitenkaan ymmärrä Bitcoinin historiaa, tarkoitusta saati teknologiaa, mikä johtaa monenlaisiin väärinkäsityksiin tästä virtuaalivaluutasta. Tässä kirjallisuuskatsauksena toteutetussa kandidaatintutkielmassa tarkasteltiin kryptovaluutta Bitcoinin historiallista kehitystä sen alkuvuodesta 2008 vuoteen 2018 asti. Historian tunteminen on tärkeää, kun pyritään ymmärtä-mään nykypäivää. Tutkielmassa pystyttiin käymään läpi Bitcoinin koko histo-ria aivan sen alkuvuosista asti, koska Bitcoinin ensiaske…
An Efficient and Privacy-Preserving Blockchain-Based Authentication Scheme for Low Earth Orbit Satellite Assisted Internet of Things
2022
Recently, integrating satellite networks (e.g. Low-earth-orbit satellite constellation) into the Internet of Things (IoT) ecosystem has emerged as a potential paradigm to provide more reliable, ubiquitous and seamless network services. The LEO satellite networks serves as a key enabler to transform the connectivity across industries and geographical border. Despite the convenience brought from the LEO satellite networks, it arises security concerns, in which the essential one is to secure the communication between the IoT devices and the LEO satellite network. However, some challenges inheriting from the LEO satellite networks need to be considered : 1) the dynamic topology; 2) the resource…
IL SUCCIACAPRE CAPRIMULGUS EUROPAEUS (Aves Caprimulgiformes) NIDIFICANTE ALLO STAGNONE DI MARSALA (TRAPANI)
2017
First breeding of Nightjar Caprimulgus europaeus (Aves Caprimulgiformes) in the Stagnone di Marsala (Trapani, western Sicily)
Determinants of the Effectiveness of Using Renewable Resource Management-Based Simulations in the Development of Critical Thinking: An Application of…
2019
The twenty-first century&rsquo
'New' vs 'old' leaderships: the campaign of Spanish general elections 2015 on Twitter
2016
The focus of this research is to analyze the activity on Twitter, during the campaign for the 2015 general elections in Spain, of the leaders of the main Spanish political parties: Mariano Rajoy (PP), Pedro Sánchez (PSOE), Pablo Iglesias (Podemos) and Albert Rivera (Ciudadanos). That means: how many messages and what types of messages are published; what topics they focus on; and the main features of using Twitter: to spread political messages, reference candidate activities in the media or on the campaign trail or emphasize personal aspects. The methodological approach establishes three complementary areas: a) a quantitative analysis of the tweets published by the four candidates throughou…