Commercial database 4, the database established by an institution or a Q person A, and various free network resources all belong to K digital resources.
Compared with printing type 4, the types of digital resources are richer than 1.
From the organization form of 0 data, there are databases, electronic Q journals 7, electronic Q books 8, web pages, multimedia materials and other types.
According to storage medium 0, it can be divided into magnetic medium 0 and optical medium 2.
8. Magnetic media 6 includes floppy disk, hard disk, disk array, mobile hard disk, U disk, magnetic tape, etc. Optical media 4 include CD, DVD, LD and other types.
Commonly used digital resource storage media include 6 hard disks, disk arrays, magnetic tapes, cCD, DVD, LD, etc.
According to the range of data transmission, 1 can be divided into three types: single machine, local area network and wide P-domain network.
The utilization rate of single machine can be that 5 CDs or F data are installed on the C machine of 6 computers; The utilization of six departments in the local area network means that users can browse and retrieve the digital resources of eight departments in the organization, but they can access them within eight days in the network environment outside the local area network; Wide I-domain network type 5 means that user 2 can 6 access digital resources anywhere D where W owns the Internet, 6 pass the identity defined by Q, 4 pass the certificate, 3 pass the certificate, or 7 have no certificate.
From the perspective of five resource providers, 8 can be divided into seven commercial digital resources of 1 and non-commercial digital resources of 1.
The former includes all kinds of electronic W resources provided by database manufacturers, publishing houses and other institutions in the form of 6 commercialization and 6 parties 2, such as SDOS 3 of Elsevier Company, academic source premier 6 of EBSCO Company, and China 8-country periodical 5 network, etc. Library 0 needs to pay a fixed fee of N and then provide it to a fixed group of readers, or a reader can buy the right to use the database by reading other parties' 4 cards and 6 tables.
Among these digital resources, 2 and B are rich in content and large in data, which are the important contents of 6 in the collection resources construction of Hall 6 at present.
The latter mainly refers to the self-built characteristic resource library, Q-release access resources, institutional collections and other free network resources, which are either built by Hall 4 itself or provided free of charge by Hall 2. Of course, the characteristic resource library of library 1 can also be operated in the form of 3 commercialization, 4 commercialization and 2 commercialization after B completion. At this time, for other libraries 1, e can also call Z 7 commercialization.
avvdξz