<s>
Yahoo	B-Application
Beijing	I-Application
Global	I-Application
R&D	I-Application
Center	I-Application
was	O
one	O
of	O
three	O
global	O
Yahoo	B-Application
R&D	O
Centers	O
.	O
</s>
<s>
The	O
center	O
conducts	O
research	O
in	O
four	O
areas	O
:	O
personalization	O
,	O
advertising	O
,	O
mobile	O
and	O
cloud	B-Architecture
computing	I-Architecture
.	O
</s>
<s>
The	O
center	O
operates	O
under	O
a	O
mission	O
of	O
Platform	B-Application
as	I-Application
a	I-Application
service	I-Application
(	O
PaaS	B-Application
)	O
through	O
a	O
combination	O
of	O
science	O
and	O
engineering	O
.	O
</s>
<s>
Mobile	O
–	O
research	O
on	O
mobile	O
backend	O
services	O
,	O
application	O
and	O
mobile	O
SDK(basic building blocks )	O
.	O
</s>
<s>
Cloud	B-Architecture
computing	I-Architecture
–	O
infrastructure	O
to	O
build	O
big	O
data	O
platforms	O
that	O
enable	O
next-generation	O
mathematical	O
models	O
,	O
real-time	O
insights	O
and	O
predictive	O
analytics	O
,	O
by	O
improving	O
service	O
containers	O
to	O
scale	O
only	O
horizontally	O
and	O
vertically	O
across	O
abstraction	O
layers	O
.	O
</s>
<s>
The	O
next-generation	O
data	O
storage	O
system	O
supports	O
multi-petabyte	O
scale	O
data	O
,	O
and	O
offers	O
storage	O
services	O
to	O
Yahoo	B-Application
Mail	I-Application
,	O
Yahoo	B-Application
Messenger	I-Application
and	O
Flickr	B-Algorithm
.	O
</s>
<s>
On	O
May	O
19	O
,	O
2013	O
,	O
Yahoo	B-Application
Beijing	O
R&D	O
Hack	O
Day	O
was	O
held	O
in	O
Beijing	O
,	O
the	O
first	O
in	O
mainland	O
China	O
.	O
</s>
<s>
On	O
November	O
8	O
,	O
2005	O
,	O
Yahoo	B-Application
organized	O
the	O
first	O
"	O
Hack	O
Day	O
"	O
.	O
</s>
<s>
Originally	O
it	O
was	O
a	O
competition	O
of	O
skills	O
and	O
creativity	O
as	O
well	O
as	O
entertaining	O
activities	O
only	O
for	O
Yahoo	B-Application
employees	O
.	O
</s>
