<s>
Dew	B-Operating_System
computing	I-Operating_System
is	O
an	O
information	B-General_Concept
technology	I-General_Concept
(	O
IT	B-General_Concept
)	O
paradigm	O
that	O
combines	O
the	O
core	O
concept	O
of	O
cloud	B-Architecture
computing	I-Architecture
with	O
the	O
capabilities	O
of	O
end	O
devices	O
(	O
personal	B-Device
computers	I-Device
,	O
mobile	O
phones	O
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
It	B-General_Concept
is	O
used	O
to	O
enhance	O
the	O
experience	O
for	O
the	O
end	O
user	O
in	O
comparison	O
to	O
only	O
using	O
cloud	B-Architecture
computing	I-Architecture
.	O
</s>
<s>
Dew	B-Operating_System
computing	I-Operating_System
attempts	O
to	O
solve	O
major	O
problems	O
related	O
to	O
cloud	B-Architecture
computing	I-Architecture
technology	O
,	O
such	O
as	O
reliance	O
on	O
internet	O
access	O
.	O
</s>
<s>
Dropbox	B-Application
is	O
an	O
example	O
of	O
the	O
dew	B-Operating_System
computing	I-Operating_System
paradigm	O
,	O
as	O
it	B-General_Concept
provides	O
access	O
to	O
the	O
files	O
and	O
folders	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
in	O
addition	O
to	O
keeping	O
copies	O
on	O
local	O
devices	O
.	O
</s>
<s>
This	O
allows	O
the	O
user	O
to	O
access	O
files	O
during	O
times	O
without	O
an	O
internet	O
connection	O
;	O
when	O
a	O
connection	O
is	O
established	O
again	O
,	O
files	O
and	O
folders	O
are	O
synchronized	O
back	O
to	O
the	O
cloud	B-Architecture
server	B-Application
.	O
</s>
<s>
The	O
term	O
"	O
dew	B-Operating_System
computing	I-Operating_System
"	O
,	O
as	O
used	O
in	O
information	B-General_Concept
technology	I-General_Concept
,	O
first	O
appeared	O
in	O
2015	O
in	O
IT	B-General_Concept
literature	O
and	O
since	O
then	O
has	O
become	O
a	O
field	O
of	O
its	O
own	O
.	O
</s>
<s>
The	O
cloud-dew	O
architecture	O
was	O
proposed	O
as	O
a	O
possible	O
solution	O
to	O
the	O
offline	O
data	O
accessibility	O
problem	O
.	O
</s>
<s>
At	O
first	O
,	O
its	O
scope	O
included	O
only	O
web	B-Application
applications	I-Application
;	O
broader	O
applications	O
were	O
later	O
proposed	O
.	O
</s>
<s>
Dew	B-Operating_System
computing	I-Operating_System
is	O
a	O
model	O
which	O
was	O
derived	O
from	O
the	O
original	O
concept	O
of	O
cloud	B-Architecture
computing	I-Architecture
.	O
</s>
<s>
Other	O
models	O
have	O
also	O
emerged	O
from	O
cloud	B-Architecture
computing	I-Architecture
,	O
including	O
fog	B-Device
computing	I-Device
,	O
edge	B-Device
computing	I-Device
,	O
dew	B-Operating_System
computing	I-Operating_System
,	O
and	O
others	O
.	O
</s>
<s>
Proponents	O
claim	O
that	O
these	O
novel	O
models	O
,	O
such	O
as	O
dew	B-Operating_System
computing	I-Operating_System
,	O
can	O
provide	O
better	O
experiences	O
for	O
users	O
.	O
</s>
<s>
Cloud	B-Architecture
computing	I-Architecture
provides	O
universal	O
access	O
and	O
scalability	B-Architecture
.	O
</s>
<s>
In	O
the	O
classic	O
cloud	B-Architecture
computing	I-Architecture
paradigm	O
,	O
when	O
the	O
internet	O
connection	O
to	O
the	O
servers	B-Application
is	O
lost	O
,	O
the	O
user	O
is	O
unable	O
to	O
access	O
their	O
data	O
;	O
dew	B-Operating_System
computing	I-Operating_System
aims	O
to	O
solve	O
this	O
problem	O
.	O
</s>
<s>
As	O
an	O
information	B-General_Concept
technology	I-General_Concept
paradigm	O
,	O
dew	B-Operating_System
computing	I-Operating_System
seeks	O
to	O
use	O
the	O
capabilities	O
of	O
personal	B-Device
computers	I-Device
along	O
with	O
cloud	B-Architecture
services	I-Architecture
in	O
a	O
more	O
reliable	O
manner	O
.	O
</s>
<s>
The	O
key	O
features	O
of	O
dew	B-Operating_System
computing	I-Operating_System
are	O
independence	O
and	O
collaboration	O
.	O
</s>
<s>
Collaboration	O
means	O
that	O
the	O
application	O
must	O
be	O
able	O
to	O
connect	O
to	O
the	O
cloud	B-Architecture
service	I-Architecture
and	O
synchronize	O
data	O
when	O
appropriate	O
.	O
</s>
<s>
Analogically	O
,	O
cloud	B-Architecture
computing	I-Architecture
is	O
a	O
remote	O
service	O
,	O
fog	B-Device
computing	I-Device
is	O
beside	O
the	O
user	O
,	O
and	O
dew	B-Operating_System
computing	I-Operating_System
is	O
at	O
the	O
user	O
end	O
.	O
</s>
<s>
To	O
establish	O
a	O
cloud-dew	O
architecture	O
on	O
a	O
PC	O
,	O
a	O
dew	O
virtual	O
machine	O
(	O
DVM	O
)	O
is	O
needed	O
.	O
</s>
<s>
The	O
DVM	O
is	O
an	O
isolated	O
environment	O
for	O
executing	O
the	O
dew	O
server	B-Application
on	O
the	O
local	O
PC	O
,	O
and	O
it	B-General_Concept
consists	O
of	O
at	O
least	O
three	O
components	O
:	O
the	O
dew	O
server	B-Application
(	O
DS	O
)	O
,	O
the	O
data	B-General_Concept
analytics	I-General_Concept
server	B-Application
(	O
DAS	O
)	O
,	O
and	O
the	B-Application
artificial	I-Application
intelligence	I-Application
of	O
the	O
dew	O
(	O
AID	O
)	O
.	O
</s>
<s>
Dew	O
server	B-Application
(	O
DS	O
)	O
:	O
The	O
DS	O
acts	O
like	O
the	O
cloud	B-Architecture
service	I-Architecture
on	O
the	O
local	O
PC	O
.	O
</s>
<s>
It	B-General_Concept
interacts	O
with	O
and	O
periodically	O
synchronizes	O
content	O
with	O
the	O
cloud	B-Architecture
service	I-Architecture
.	O
</s>
<s>
Dew	O
analytics	O
server	B-Application
(	O
DAS	O
)	O
:	O
The	O
dew	O
analytics	O
server	B-Application
collects	O
data	O
about	O
how	O
the	O
dew	O
server	B-Application
is	O
being	O
used	O
.	O
</s>
<s>
Artificial	B-Application
intelligence	I-Application
of	O
the	O
dew	O
(	O
AID	O
)	O
:	O
After	O
receiving	O
data	O
from	O
the	O
DAS	O
about	O
usage	O
patterns	O
,	O
the	O
AID	O
uses	O
the	O
data	O
to	O
customize	O
and	O
tailor	O
the	O
dew	O
server	B-Application
to	O
the	O
user	O
to	O
enhance	O
their	O
experience	O
.	O
</s>
<s>
The	O
dew	B-Operating_System
computing	I-Operating_System
categories	O
are	O
classified	O
based	O
on	O
the	O
application	O
field	O
.	O
</s>
<s>
Because	O
this	O
fraction	O
synchronizes	O
with	O
the	O
web	O
,	O
it	B-General_Concept
satisfies	O
the	O
collaboration	O
feature	O
of	O
dew	B-Operating_System
computing	I-Operating_System
.	O
</s>
<s>
The	O
storage	O
of	O
the	O
local	O
device	O
is	O
partially	O
or	O
fully	O
copied	O
into	O
the	O
cloud	B-Architecture
.	O
</s>
<s>
An	O
example	O
is	O
Dropbox	B-Application
,	O
in	O
which	O
a	O
user	O
can	O
create	O
a	O
folder	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
,	O
and	O
have	O
access	O
to	O
the	O
folder	O
and	O
its	O
contents	O
on	O
the	O
local	O
device	O
once	O
synchronization	O
is	O
complete	O
.	O
</s>
<s>
Since	O
the	O
user	O
can	O
access	O
files	O
at	O
any	O
time	O
without	O
the	O
need	O
for	O
constant	O
Internet	O
access	O
,	O
this	O
category	O
meets	O
the	O
independence	O
feature	O
of	O
dew	B-Operating_System
computing	I-Operating_System
.	O
</s>
<s>
SiD	O
also	O
meets	O
the	O
collaboration	O
feature	O
because	O
the	O
folder	O
and	O
its	O
contents	O
automatically	O
synchronize	O
with	O
the	O
cloud	B-Architecture
service	I-Architecture
.	O
</s>
<s>
The	O
local	O
device	O
and	O
the	O
cloud	B-Architecture
both	O
store	O
copies	O
of	O
the	O
same	O
database	O
.	O
</s>
<s>
One	O
of	O
these	O
two	O
databases	O
is	O
considered	O
the	O
main	O
version	O
and	O
can	O
be	O
defined	O
as	O
such	O
by	O
the	O
database	B-General_Concept
administrator	I-General_Concept
.	O
</s>
<s>
This	O
service	O
increases	O
the	O
reliability	O
of	O
a	O
database	O
,	O
as	O
one	O
of	O
the	O
databases	O
can	O
act	O
as	O
the	O
backup	B-Protocol
for	O
the	O
other	O
.	O
</s>
<s>
The	O
configuration	O
and	O
ownership	O
of	O
software	O
are	O
saved	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
.	O
</s>
<s>
Examples	O
include	O
the	O
Apple	B-Application
App	I-Application
Store	I-Application
and	O
Google	B-Application
Play	I-Application
,	O
where	O
the	O
applications	O
the	O
user	O
installs	O
are	O
saved	O
to	O
their	O
account	O
and	O
can	O
then	O
be	O
installed	O
on	O
any	O
device	O
linked	O
to	O
their	O
account	O
.	O
</s>
<s>
A	O
software	O
development	O
suite	O
must	O
be	O
installed	O
on	O
the	O
local	O
device	O
with	O
the	O
settings	O
and	O
application	O
data	O
synchronized	O
to	O
the	O
cloud	B-Architecture
service	I-Architecture
.	O
</s>
<s>
A	O
Software	B-Application
Development	I-Application
Kit	I-Application
on	O
its	O
own	O
does	O
not	O
satisfy	O
these	O
requirements	O
;	O
it	B-General_Concept
must	O
be	O
able	O
to	O
synchronize	O
development	O
data	O
,	O
system	O
deployment	O
data	O
,	O
and	O
online	O
backups	B-Protocol
.	O
</s>
<s>
The	O
local	O
device	O
is	O
dynamically	O
supported	O
by	O
cloud	B-Architecture
services	I-Architecture
.	O
</s>
<s>
IaD	O
can	O
come	O
in	O
different	O
forms	O
,	O
but	O
the	O
following	O
two	O
forms	O
can	O
be	O
used	O
:	O
(	O
1	O
)	O
the	O
local	O
device	O
can	O
have	O
an	O
exact	O
duplicate	O
DVM	O
instance	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
,	O
which	O
is	O
always	O
kept	O
in	O
the	O
same	O
state	O
as	O
the	O
local	O
instance	O
,	O
or	O
(	O
2	O
)	O
the	O
local	O
device	O
can	O
have	O
all	O
its	O
settings/data	O
saved	O
in	B-Architecture
the	I-Architecture
cloud	I-Architecture
,	O
including	O
system	O
settings/data	O
and	O
data	O
for	O
each	O
application	O
.	O
</s>
<s>
An	O
example	O
is	O
the	O
Novell	B-Operating_System
Groupwise	I-Operating_System
email	O
client	O
.	O
</s>
<s>
Dew	B-Operating_System
computing	I-Operating_System
faces	O
a	O
number	O
of	O
technical	O
challenges	O
,	O
including	O
issues	O
related	O
to	O
power	O
management	O
,	O
processor	O
utility	O
,	O
and	O
data	O
storage	O
.	O
</s>
<s>
Other	O
factors	O
impacting	O
the	O
use	O
of	O
dew	B-Operating_System
computing	I-Operating_System
are	O
the	O
viability	O
of	O
the	O
operation	O
system	O
,	O
network	O
model	O
,	O
communication	O
model	O
,	O
programming	O
principles	O
,	O
dew	O
recommended	O
engine	O
,	O
local	O
dew	O
network	O
,	O
personal	O
high	O
productivity	O
,	O
database	O
security	O
,	O
and	O
behaviors	O
of	O
the	O
browser	O
.	O
</s>
