There is growing concern about the depletion of hydrocarbon resources and the risk of near-term peaks in production. These concerns hinge upon contested estimates of the recoverable resources of different regions and the associated forecasts of regional production. Beginning with Hubbert, an influential group of analysts have used growth curves both to estimate recoverable resources and to fore...

In this work, we give the first construction of high-rate locally list-recoverable codes. Listrecovery has been an extremely useful building block in coding theory, and our motivation is to use these codes as such a building block. In particular, our construction gives the first capacity-achieving locally list-decodable codes (over constant-sized alphabet); the first capacity achieving globally...

1. A wide variety of procedures was used to test the motility of mammalian sperm after plunging them into liquid nitrogen at -195 degrees C. and later rapidly warming them to 35 degrees C. by plunging them into a suitable balanced and isotonic medium. 2. Using seminal fluid sperm from the same human donor, maximal numbers of motile sperm survived vitrification when the samples were (a) very fre...

The deployment of a “public-key infrastructure” (PKI) has recently started. Another recent concern in business and on the national level is the issue of escrowed encryption, key recovery, and emergency access to information (e.g., in the medical record area). Independent development of a PKI and an escrowed PKI (whenever required or desired) will pose a lot of constraints, duplication efforts a...

Research in the area of fault-tolerant distributed systems has focused to a large extent on data surviving various forms of failure. The replica control algorithms for maintaining mutually consistent replicas abound in number. However, comparatively little work has been devoted to making processes recoverable. In domains other than databases and transaction processing, faulttolerance generally ...

In a distributed system using rollback recovery, information saved on stable storage during failure-free execution allows certain states of each process to be restored after a failure. For example, in a system of deterministic processes using message logging and checkpointing, a process state can be restored only if all messages received by the process since its previous checkpoint have been lo...