An Archival Repository reliably stores digital objects for long periods of time (decades or centuries). The archival nature of the system requires new techniques for storing, indexing, and replicating digital objects. In this paper we discuss the specialized indexing needs of a write-once archive. We also present a reliability algorithm for effectively replicating sets of related objects. We de...

We are in the process of developing a system architecture for opportunistic and information centric communications. This architecture (called Keetchi), meant for the Internet of Things (IoT) is focussed on enabling applications to perform distributed and decentralised communications among smart devices. To realise and evaluate this architecture, we follow a 3-step approach. Our first approach o...

Many forms of digital memory have been developed for the permanent storage of information. These include keypunch cards, paper tapes, PROMS, photographic film and, more recently, digital optical disks. All these “write-once” memories have the property that once a “one” is written in a particular cell, tbis cell becomes irreversibly set at one. Thus, the ability to rewrite information in the mem...

I assume that most students have encountered Turing machines before. (Students who have not may want to look at Sipser’s book [3].) A Turing machine is defined by an integer k ≥ 1, a finite set of states Q, an alphabet Γ, and a transition function δ : Q×Γk → Q×Γk−1×{L, S,R}k where: • k is the number of (infinite, one-dimensional) tapes used by the machine. In the general case we have k ≥ 3 and ...

development of an autonomous weeding machine requires a vision system capable of detecting and locating the position of the crop. it is important for the vision system to be able to recognize the accurate position of the crop stem to be protected during weeding. several shape features of corn plants and common weed species in the location were extracted by means of morphological operations. eff...

is the loss of lens accommodation with age that results in an inability to focus at near distances. It is receiving growing attention because of the recognition that good near vision is needed to accomplish a broad range of tasks, not only reading and writing. Research shows that there are differences between men and women in the prevalence, age of onset, and severity of presbyopia, 1 in the ty...

offices of the Wessex Council on Alcoholism, 14 Brunswick Place, Southampton, a group of people meet to discuss the difficulties they encounter in fighting an insidious disease that is threatening to ruin their lives?alcoholism. Any non-alcoholics attending would undoubtedly be surprised by the questions asked by these anxious and often apprehensive addicts. Questions that range from a middle-a...

We consider the problem of implementing general sharedmemory objects on top of write-once bits, which can be changed from 0 to 1 but not back again. In a sequential setting, write-once memory (WOM) codes have been developed that allow simulating memory that support multiple writes, even of large values, setting an average of 1 + o(1) write-once bits per write. We show that similar space efficie...

This is a special conference for the Federal Reserve Bank of Boston, and for me personally. The role of monetary aggregates in monetary policy was intensely controversial when I joined the staff of the Board of Governors in May 1969. I was immediately asked to join the staff of the newly formed FOMC Committee on the Directive. Governor Sherman Maisel chaired that committee; the other two member...

JEDICKE WILL WRITE ONCE REMAINDER OF PAPER IS COMPLETE. Subject headings: Near-Earth Objects; Asteroids, Dynamics