title: Compression and full-text indexing for Digital Libraries

authors: Witten, Ian H.

subjects: computer science

abstract: This chapter has demonstrated the feasibility of full-text indexing of large information bases. The use of modern compression techniques means that there is no space penalty: large document databases can be compressed and indexed in less than a third of the space required by the originals. Surprisingly, there is little or no time penalty either: querying can be faster because less information needs to be read from disk. Simple queries can be answered in a second; more complex ones with more query terms may take a few seconds. One important application is the creation of static databases on CD-ROM, and a 1.5 gigabyte document database can be compressed onto a standard 660 megabyte CD-ROM. 
Creating a compressed and indexed document database containing hundreds of thousands of documents and gigabytes of data takes a few hours. Whereas retrieval can be done on ordinary workstations, creation requires a machine with a fair amount of main memory.

text: Compression and full-text indexing for Digital Libraries This chapter has demonstrated the feasibility of full-text indexing of large information bases. The use of modern compression techniques means that there is no space penalty: large document databases can be compressed and indexed in less than a third of the space required by the originals. Surprisingly, there is little or no time penalty either: querying can be faster because less information needs to be read from disk. Simple queries can be answered in a second; more complex ones with more query terms may take a few seconds. One important application is the creation of static databases on CD-ROM, and a 1.5 gigabyte document database can be compressed onto a standard 660 megabyte CD-ROM. 
Creating a compressed and indexed document database containing hundreds of thousands of documents and gigabytes of data takes a few hours. Whereas retrieval can be done on ordinary workstations, creation requires a machine with a fair amount of main memory.

year: 1995

title: Tree browsing

authors: Apperley, Mark

subjects: computer science

abstract: Graphic representations of tree structures are notoriously difficult to create, display, and interpret, particularly when the volume of information they contain, and hence the number of nodes, is large. The problem of interactively browsing information held in tree structures is examined, and a design for a tree browser proposed. This design is based on distortion-oriented display techniques and intuitive direct manipulation interaction. The tree layout is automatically generated, but the location and extent of detail shown is controlled by the user. It is suggested that these techniques could be extended to the browsing of more general networks.

text: Tree browsing Graphic representations of tree structures are notoriously difficult to create, display, and interpret, particularly when the volume of information they contain, and hence the number of nodes, is large. The problem of interactively browsing information held in tree structures is examined, and a design for a tree browser proposed. This design is based on distortion-oriented display techniques and intuitive direct manipulation interaction. The tree layout is automatically generated, but the location and extent of detail shown is controlled by the user. It is suggested that these techniques could be extended to the browsing of more general networks.

year: 1996-07

title: Perceptions of coarse anglers and freshwater managers, and the impact of these perceptions on management of non-indigenous invasive fish

authors: Duggan, Kathryn S.

abstract: This report examines coarse angler attitudes and behaviours to determine the reasons for, and develop incentives to successfully discourage, deliberate spreads of coarse fish species. The perceptions of freshwater managers, and the ways in which these human perceptions influence management of non-indigenous invasive fish, are also explored. To achieve this two main methodological strategies were employed: (1) semi-structured interviews with representatives from management agencies, research providers, iwi, the New Zealand Federation of Coarse Anglers, and individual coarse anglers: and (2) an internet survey with individual coarse anglers. In contrast to many New Zealanders, coarse fish species are highly valued by coarse anglers and the practice of coarse fishing is an important part of their lives. While a large portion of coarse anglers state they would like more fishing opportunities (especially outside of the Auckland/Waikato region), they argue that they do not practice or support illegal spread of coarse fish.

text: Perceptions of coarse anglers and freshwater managers, and the impact of these perceptions on management of non-indigenous invasive fish This report examines coarse angler attitudes and behaviours to determine the reasons for, and develop incentives to successfully discourage, deliberate spreads of coarse fish species. The perceptions of freshwater managers, and the ways in which these human perceptions influence management of non-indigenous invasive fish, are also explored. To achieve this two main methodological strategies were employed: (1) semi-structured interviews with representatives from management agencies, research providers, iwi, the New Zealand Federation of Coarse Anglers, and individual coarse anglers: and (2) an internet survey with individual coarse anglers. In contrast to many New Zealanders, coarse fish species are highly valued by coarse anglers and the practice of coarse fishing is an important part of their lives. While a large portion of coarse anglers state they would like more fishing opportunities (especially outside of the Auckland/Waikato region), they argue that they do not practice or support illegal spread of coarse fish.

year: 2015