ฑจธๆศหฃบศ๐สฟหีภ่สภด๓ัง Claudio J. Tessone
ฑจธๆสฑผไฃบ2018ฤ๊7ิย7ศีษฯฮ็10:30
ฑจธๆตุตใฃบปดฐฒษ๑อ๚ด๓พฦต๊พบฒยืใฒสฑศทึึฑฒฅฑจธๆฬ�
ฑจธๆีชาชฃบBlockchains have disrupted the way of thinking decentralised systems: This mechanism allows the secure diffusion of information across a network without the need of a central (trusted) authority to enforce the emergence of consensus in the information that is exchanged and stored by its participants. Indeed, as a primary example, the digital currency Bitcoin is implemented on top of a blockchain, and its value is solely assigned by a (largely speculative) market. This talk is divided into two parts. First, the analysis of Bitcoin as a closed economy: having followed a technocratic approach in its immutable design, it is the only case of an economy where all monetary transactions can be traced back with full detail. Interestingly, its fixed incentive scheme has created the emergence of large levels of centralisation and economic flow, drastically different from its original conception. The second part of the presentation is about consensus in blockchain-based systems. While in the last years the number of its applications has increased enormously, little is known about their suitability in stressed working conditions. We introduce a stochastic modelling approach (an extension of the celebrated compartmental models) for these systems, identifying a phase transition from efficient consensus in the diffusion of information to a frustrated (congested) state where the information flow rapidly deteriorates.ฃจว๘ฟ้มดศลยามหทึษขฯตอณตฤหผฮฌทฝสฝฃฌีโึึป๚ึฦิสะํะลฯขิฺอ๘ย็ึะฐฒศซภฉษขฃฌถ๘ฒปะ่าชาปธ๖ึะั๋(ส�ะลศฮตฤ)ศจอ�ภดวฟึฦฒฮำ๋ี฿ิฺฝปปปบอดๆดขตฤะลฯขึะณ๖ฯึนฒสถกฃส�ืึป๕ฑาฑศฬุฑาื๗ฮชว๘ฟ้มดตฤำฆำรึ๗าชฐธภ�ฃฌฦไผ�ึตฝ๖ำษาปธ๖อถป๚ะิสะณกภดทึลไกฃฑพฝฒื๙ทึฮชมฝฒฟทึกฃสืฯศฃฌถิฑศฬุฑาื๗ฮชทโฑีพญผรตฤทึฮ๖ฃฌิฺฦไฒปฑไตฤษ่ผฦึะื๑ัญมหาปึึผผส๕อณม์ตฤทฝสฝฃฌีโสวฮจาปาปธ๖ห๙ำะป๕ฑาฝปาืถผฤ�ฑปฯ๊พกืทห�ตฤพญผรฐธภ�กฃำะศคตฤสวฃฌห�ตฤนฬถจผคภ๘ป๚ึฦด฿ษ๚มหด๓นๆฤฃตฤึะั๋ผฏศจบอพญผรม๗ถฏฃฌำ๋ื๎ณ๕ตฤษ่ฯ๋ฝุศปฒปอฌกฃฑจธๆตฤตฺถ�ฒฟทึสวป๙ำฺว๘ฟ้มดฯตอณตฤนฒสถกฃหไศปิฺน�ศฅตฤผธฤ๊ึะฃฌฦไำฆำรณฬะ๒ตฤส�มฟำะมหพ�ด๓ตฤิ๖ณคฃฌตซศหรวถิฦไิฺฝ๔ีลนคื๗ปทพณึะตฤสสำระิึชึฎษ๕ษูกฃฮารวฝ้ษ�มหาปึึหๆป๚ฝจฤฃทฝทจ(ึ๘ร๛ทึว๘ฤฃะอตฤภฉีน)ฃฌศทถจมหดำะลฯขดซฒฅตฤำะะงนฒสถตฝะลฯขม๗ัธหูถ๑ปฏตฤำตศ๛ืดฬฌตฤฯเฑไน�ณฬกฃฃฉ
ฑจธๆศหผ๒ฝ้ฃบClaudio J. Tessone is Assistant Professor for Network Science at the University of Zurich (Faculty of Economics, Business Administration and Information Technologies), where he also serves as co-director of the University Priority Programme on Social Networks. He holds a Masters and PhD in Physics, where he studied stochastic processes and the role of heterogeneity in complex, interacting systems. Prior to his current appointment, he was senior researcher at the Chair of Systems Design of the Department of Management, Economics and Technology at ETH Zurich, where he obtained a Habilitation on "Complex socio-economic systems". Further, he is founding member of the Blockchain Cantre UZH. He is an expert in the modelling of economic, social and technical systems from a quantitative and interdisciplinary perspective with 70 publications in diverse areas. This includes: blockchain and cryptocurrencies, knowledge flow within and across organisations, network nestedness, influencer identification in temporal networks.ฃจClaudio J. Tessoneำตำะฮ๏ภํังหถสฟบอฒฉสฟังฮปฃฌสวหีภ่สภด๓ังฃจพญผรังฃฌนคษฬน�ภํบอะลฯขผผส๕ังิบฃฉอ๘ย็ฟฦังึ๚ภํฝฬสฺฃฌห๛ปนตฃศฮด๓ังำลฯศผฦปฎษ็ปแอ๘ย็ทฝฯ๒ตฤมชบฯึ๗ศฮกฃึ๗าชัะพฟหๆป๚น�ณฬบอา์ึสะิิฺธดิำตฤฯเปฅื๗ำรฯตอณึะตฤื๗ำรกฃิฺดหึฎวฐฃฌห๛สวหีภ่สภมชฐ๎ภํนคังิบน�ภํฃฌพญผรบอผผส๕ฯตฯตอณษ่ผฦฯตึ๗ศฮตฤธ฿ผถัะพฟิฑกฃดหอโฃฌห๛ปนสวหีภ่สฟด๓ังว๘ฟ้มดัะพฟึะะฤตฤดดสผณษิฑกฃห๛สวถจมฟบอฟ็ังฟฦสำฝวฯยตฤพญผรฃฌษ็ปแบอผผส๕ฯตอณฝจฤฃทฝรๆตฤืจผาฃฌิฺฒปอฌม์ำ๒ำะ70ฦชังส๕ย�ฮฤฃฌฦไึะฐ�ภจฃบว๘ฟ้มดบอผำร�ป๕ฑาฃฌื้ึฏฤฺบอื้ึฏผไตฤึชสถม๗ฃฌอ๘ย็วถฬืฃฌสฑผไอ๘ย็ึะตฤำฐฯ์ี฿สถฑ๐กฃฃฉ
