The dynamics of dissolved oxygen concentration for water quality monitoring and assessment in polder ditches

This study deals with the use of the dynamics of dissolved oxygen concentration for water quality assessment in polder ditches. The dynamics of the dissolved oxygen concentration, i.e. the temporal and spatial variations in a few polder ditches under a range of natural, pollution and management conditions is presented. Five requisites formulated for the water quality indicator are discussed: (1) its relation with water quality goals, (2) nature and amount of information it provides, (3) if it could be standardized, (4) if it could be manipulated and (5) its measurability.

Using Serious Gaming to Discover and Understand Distributed Ledger Technology in Distributed Energy Systems

Part 8: Knowledge Based EngineeringInternational audienceThis paper provides an extension to a family of games that are in the theme of distributed energy systems. This extension of the family of games is a direct result of developing a derived type of game, that is, an energy trading and investing game that involves the infrastructural usage of a new technology, in this particular case, blockchain (a type of distributed ledger technology). The game’s novel architecture is explained succinctly, and some results are discussed. Shortly, the extensions of the generic architecture are listed, and special emphasis is put on the idea that such a game must have a two-phased play – one with the novel technology not active and one with it activated. Finally, some insights in game architecture development and the necessary next steps are posited

Herstelmaatregelen in ondiepe meren: zijn de verbeteringen blijvend?

In deze studie evalueren we gegevens van 28 Nederlandse en 50 Deense meren waar effectgericht maatregelen zijn toegepast, waaronder voornamelijk actief biologisch beheer door afvissen van brasem en blankvoorn. Daarnaast zijn in sommige meren ook andere maatregelen toegepast, zoals baggeren en chemische fosfaatfixatie in het sediment. In meer dan de helft van de gevallen was actief biologisch beheer succesvol op de korte termijn. In sommige gevallen nam niet alleen het chlorofyl-, maar ook de fosfor- en stikstofgehaltes sterk af. Op de lange termijn was de heldere toestand in de meeste gevallen echter niet stabie

Trinocchio: privacy-preserving outsourcing by distributed verifiable computation

Verifiable computation allows a client to outsource computations to a worker with a cryptographic proof of correctness of the result that can be verified faster than performing the computation. Recently, the highly efficient Pinocchio system was introduced as a major leap towards practical verifiable computation. Unfortunately, Pinocchio and other efficient verifiable computation systems require the client to disclose the inputs to the worker, which is undesirable for sensitive inputs. To solve this problem, we propose Trinocchio: a system that distributes Pinocchio to three (or more) workers, that each individually do not learn which inputs they are computing on. We fully exploit the almost linear structure of Pinochhio proofs, letting each worker essentially perform the work for a single Pinocchio proof; verification by the client remains the same. Moreover, we extend Trinocchio to enable joint computation with multiple mutually distrusting inputters and outputters and still very fast verification. We show the feasibility of our approach by analysing the performance of an implementation in a case study