1,721,005 research outputs found
Tecnologie wireless per l'archeologia: 1996-2006
No full textLa collaborazione tra DARFICLET e DISI è ormai giunta al decimo anno, anzi conta anche qualche mese in più, se ne fissiamo l’origine a quando alcuni informatici ed alcuni archeologi genovesi per la prima volta iniziarono a discutere insieme, alla ricerca di nuove idee, stimolanti per la ricerca in entrambi i settori
Computer mobili per la gestione dei dati di scavo
No full textThis paper describes a system for real-time field support to archaeological excavations, and for interaction with remote researchers, via the Internet. To this aim, a prototype system has already been field tested at the site of Poliochni in Greece. The system is composed of a wireless LAN, including one (two or more in the future) mobile unit (Telxon PTC), and a wired LAN, with at least one PC or Workstation running Windows NT and Lotus Notes Domino for groupware activities. The two LANs are connected by means of an Access Point Aironet 630 (Radio-hub). The system provides a communication link with remote workstations installed in Universities or Museums where researchers who are interested in cooperating in real-time with field operators can work. Archaeologists can use the mobile units to draw finds on the screen using a magnetic pen, to write related textual information and to send these sketches or digital snapshots to the fixed host by using suitable interfaces (serial, parallel, PCMCIA, and so on)
RAMSES: a mobile computing system for field archaeology.
No full textRAMSES (Remote Archeological Mobile Support Enhanced System) is an outdoor application of mobile computing to field
archaeology, whose prototype has already been field tested in Summer 1998 at the site of Poliochni in Greece.
The requirements for both hardware and software are illustrated; the system is composed by a fixed station, acting as object repository, and a few mobile units which input archaeological evidence by means of electromagnetic pen.
The software components on both fixed and mobile systems and their interaction are described as well
Putting virtual heritage in the field: the PAST project
No full textThe paper briefly describes the objectives and technological issues of PAST, a project aimed at assisting visitors of archaeological sites in understanding cultural heritage. Pilot installations are being developed at three sites, Bibracte in France, Passo di Corvo in Italy and Toumba in Greece
An Integrated Environment for Scientific Data Entry and Management on mobile systems
No full textIn this paper, an integrated approach to the problem of entering and manipulating scientific data on mobile devices connected in a wireless network is presented, and its ability to support mobile users operating on the field in indoor and outdoor environments is briefly discussed. This approach is based on experiences collected by the authors in the development of three mobile applications, for cultural heritage and healthcare, with mobile computers connected via a wireless network
Efficient Construction of LR(k) States and Tables
No full textA new method for building LR(k) states and parsing tables is presented. The method aims at giving a feasible construction of a collection of LR(k) parsing tables, especially when k > 1. for nontrivial grammars. To this purpose, the algorithm first attempts to build a set of normal states for the given grammar, each one associated to a single parsing action in {accept, reduce, shift}. When such an action cannot be uniquely determined, that is, when up to k input symbols have to be examined (inadequacy), further states, belonging to a new type, called look-ahead states, are computed. The action associated with inadequate states is a new parsing action, look. States are built without actual computation of the FIRSTk and EFFk functions; that is, nonterminals are kept in the context string of items composing each state, and their expansion to terminals is deferred until indispensable to solve inadequacy. The aforementioned method is illustrated; then the canonical collection of states and the canonical tables are compared with those obtained from the proposed method. A sufficient condition is stated, by which the size of parsing tables, obtained by applying this new method, is smaller than that of canonical tables. Experimental results show that such a condition is verified by the grammars of several programming languagues and that significant speed is gained by avoiding the computation of the FIRSTk function
Channel Reification: a Reflective Approach to Fault Tolerant Software Development
No full textReflective systems can be used to ease the implementation of fault tolerance mechanisms in distributed applications as show in [Anc95, Fab94]. In this paper we introduce a new model for reflective computations, and we show how it can be used for building up fault tolerant applications. Keyword: Object-Orientation, Reflection and Fault Tolerance. 1 Introduction and Background 1.1 Fault Tolerance Software mechanisms used to support fault tolerant applications include checkpointing facilities and replicated servers, for a survey see [Anc90], such fault tolerant behaviors can be implemented either by error processing protocols in the underlying runtime systems, or using pre-defined library functions and primitives, or using object-oriented methodologies, so making nonfunctional 1 characteristics inheritable
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