We study cryptocurrency protocols that do not make use of Proof of Work. Such protocols commonly rely on Proof of Stake, i.e. on mechanisms that extend voting power to the stakeholders of the system. We offer analysis of existing protocols that have a substantial amount of popularity. We then present our novel pure Proof of Stake protocols, and argue that the they help in mitigating problems th...

NeuCoin is a decentralized peer-to-peer cryptocurrency derived from Sunny King’s Peercoin, which itself was derived from Satoshi Nakamoto’s Bitcoin. As with Peercoin, proof-of-stake replaces proof-of-work as NeuCoin’s security model, effectively replacing the operating costs of Bitcoin miners (electricity, computers) with the capital costs of holding the currency. Proof-of-stake also avoids pro...

this study constitutes an attempt to see what language assessment literacy (lal) isfor three groups of stakeholders, namely lal test developers, lal instructors, andlal test-takers. the perceptions of the former group were derived from the contentanalysis of the latest version of the lal test, and those of the latter 2 groups wereassessed through a survey designed by the researcher. participant...

*Correspondence: Tae-Il Kim (Editor-in-Chief) Department of Periodontology, Seoul National University School of Dentistry, 101 Daehak-ro, Jongno-gu, Seoul 110-749, Korea E-mail: [email protected] Tel: +82-2-2072-2642 Fax: +82-2-744-1349 We are living in the era of genetic engineering and looking forward to its eventual clinical application to life-threatening human diseases. In this context, we...

In 2009, Satoshi Nakamoto introduced the Bitcoin cryptocurrency[Nak09], an online currency system which allowed peer-to-peer transfer of digital tokens. To ensure a consistent view of token ownership, Nakamoto used a public ledger which can be replicated and validated by all network participants. To avoid a single point of failure, this ledger is authenticated using a dynamic membership multipa...

    Consequential validity, a component of construct validity as a unified concept introduced by Messick(1989), deals with the impacts of tests on teaching, learning, individual test takers, teachers, society, and educational system within a country. Although the impacts of language tests on teaching and learning have been somehow studied, the consequences of ESP tests on individual test taker...