Information Technology Reference
In-Depth Information
Diagrams, like graphs, can add greatly to the clarity of a paper. But be aware that
the design of good diagrams is not easy. Expect to revise your pictures as often as
you would your writing. Some simple diagrams are shown in Figs.
11.8
and
11.17
.
A weak diagram, shown in Fig.
11.9
, is revised in Fig.
11.10
.
Host
WAN
Hub
LAN
Host
Firewall
Host
Workstations
F
IGURE
C.
Revised network,incorporating firewall and hub withhosts and
workstationson separate cables.
Keys and pointers
in a searchable array
Nodes
in memory
Leaves
on
disk
Keys and records
F
IGURE
1.3.
Tree data structure, showing internal nodes inmemoryandex-
ternalleaves on disk;omitted nodes are indicated by dotted lines. Nodes allow
fast searchandcontain onlykeys andpointers.
Leaves use compact storage
andcontain the records.
Fig. 11.8
Shading and dashing in diagrams. In these illustrations, the shading and dashing makes
it clear whether entities are of the same kind
