This portfolio document summarizes Sungho Yoo's work experience developing software for wireless communication systems including CDMA networks and mobile phones. It lists his roles and responsibilities in projects for SK Telecom, KTF, Hyundai Electronics, UTStarcom Korea, Verizon Wireless and AT&T developing modem drivers, protocol stacks, and user interface software primarily in C/C++.

1. Sungho
Yoo’s
Por-olio

2. Por-olio
SUNGHO
YOO
Email:
yjung93@gmail.com
Cell
Phone:
+82-­‐10-­‐9144-­‐4895

3.
1xCDMA
Macro
System
Company
Hyundai
Electronics
Inc.
Customer
SK
Telecomm
Responsibility
Channel
Card
SoFware
Development
Working
Site
Korea
Project
Period
2001

4.
1xCDMA
Macro
System
§ Trouble
shooQng
and
bug
fixing
§ CDMA
protocol
flow
control
S/W
maintenance
§ IS95B
feature
implementaQon
(
Cell
BroadcasQng
Service,
Voice
Privacy,
Etc.)
§ Language:
C.
OS:
Qualcomm’s
REX
Flow
Control
S/W
ApplicaQon
Layer
L1,L2
Layer
L3
Layer
Physical
layer
L2
Layer
Air
Link
CSM
Modem
driver
E1/T1
CSM
Modem
H/W
L1
Layer
SK
Telecomm’s
SK
Telecomm’s
Mobile
Phone
Base
StaQon
Control
Base
Tranceiver
StaQon

5.
1xEV-­‐DO
Macro
System
Company
Hyundai
Electronics
Inc.
Customer
KTF
Responsibility
Modem
Card
SoFware
Development
Working
Site
Korea
Project
Period
2002

6.
1xEV-­‐DO
Macro
System
§ 1xEV-­‐DO
modem
(CSM5500)
chip
driver
S/W
PorQng
§ 1xEV-­‐DO
Physical,
Mac
Layer
protocol
stack
S/W
porQng
§ Distributed
System
base
1xEV-­‐DO
protocol
flow
control
applicaQon
development
§ Language:
C++.
OS:
Windriver
Vxworks
Flow
Control
S/W
ApplicaQon
Layer
Mac
Layer
Steam
Layer
Physical
layer
Session
Layer
CSM
Modem
driver
ATM
ConnecQon
Layer
Air
Link
CSM
Modem
H/W
Security
Layer
Mobile
Phone
Base
Tranceiver
StaQon
Base
StaQon
Control

7.
1xEV-­‐DO
Micro
System
Company
Hyundai
Electronics
Inc.
Customer
KTF
Responsibility
Modem
Card
SoFware
Development
Working
Site
Korea
Project
Period
2003~2004

8.
1xEV-­‐DO
Micro
System
§ 1xEV-­‐DO
modem
(CSM5500)
chip
driver
S/W
PorQng
§ 1xEV-­‐DO
Physical,
Mac
Layer
protocol
stack
S/W
porQng
§ Distributed
System
base
1xEV-­‐DO
protocol
flow
control
applicaQon
development
§ Language:
C++.
OS:
Windriver’s
Vxworks
Flow
Control
S/W
ApplicaQon
Layer
Mac
Layer
Steam
Layer
Physical
layer
Session
Layer
CSM
Modem
driver
TCP/IP
ConnecQon
Layer
Air
Link
CSM
Modem
H/W
Security
Layer
Mobile
Phone
Base
Tranceiver
StaQon
Base
StaQon
Control

9.
Verizon
Wireless
mobile
phone
(CDM-­‐7025)
Company
UTStarcom
Korea
Customer
Verizon
Wireless
Responsibility
Call
User
Interface
S/W
Development
Working
Site
Korea,
New
York
in
USA
Project
Period
2005~2006

10.
Verizon
Wireless
mobile
phone
(CDM-­‐7025)
§ Verizon
Wireless
UI
requirement
base
voice
and
data
Call
UI
implementaQon.
§ CDG2
(CDMA
Development
Group2)
cerQficaQon
feature
implementaQon
§ UTStarcom’s
new
UI
layer
framework
stabilizaQon
§ Language:
C.
OS:
Qualcomm’s
REX.
Debugging
tools:
Trace32
Phone
Book
App
Call
UI
App
SMS
App
Etc.
Apps
UTStarcom’s
UI
Framework
Qualcomm’s
Protocol
API
Qualcomm
CDMA
Protocol
Stack
Modem
Driver
H/W
Drivers
REX
OS
DB

11.
Verizon
Wireless
mobile
phone
(CDM-­‐7075)
Company
UTStarcom
Korea
Customer
Verizon
Wireless
Responsibility
Call
User
Interface
S/W
Development
Working
Site
Korea,
New
York
in
USA
Project
Period
2005~2006

12.
Verizon
Wireless
mobile
phone
(CDM-­‐7075)
§ Verizon
UI
requirement
base
voice
and
data
Call
UI
implementaQon.
§ CDG2
(CDMA
Development
Group2)
cerQficaQon
feature
implementaQon
§ UTStarcom’s
new
UI
layer
framework
stabilizaQon
§ Language:
C.
OS:
Qualcomm’s
REX.
Debugging
tools:
Trace32
Phone
Book
App
Call
UI
App
SMS
App
Etc.
Apps
UTStarcom’s
UI
Framework
Qualcomm’s
Protocol
API
Qualcomm
CDMA
Protocol
Stack
Modem
Driver
H/W
Drivers
REX
OS
DB

13.
AT&T
Mobile
Messaging
Phone
Company
UTStarcom
Korea
Customer
AT&T
Responsibility
SMS,
MMS
Message
S/W
Development
Working
Site
Korea,
Dallas,
LA
in
USA
Project
Period
2007~2008

14. AT&T
Mobile
Messaging
Phone
§ SMS,
MMS
Message
composer
implementaQon
§ Qualcomm’s
SMS
protocol
stack
API
interoperaQon
§ Openwave’s
MMS
soluQon
porQng
§ Language:
C.
OS:
Qualcomm’s
REX.
Debugging
tools:
Trace32
Phone
Book
App
Call
UI
App
SMS,MMS
App
Etc.
Apps
UTStarcom’s
UI
Framework
Qualcomm’s
Protocol
API
Qualcomm
UMTS
Protocol
Stack
Modem
Driver
H/W
Drivers
REX
OS
DB

15.
Morse
Talk
(Android
App)
Company
Self
Employed
Customer
Android
Market
Responsibility
ApplicaQon
Development
Working
Site
Korea
Project
Period
2011

16. Sending
Part
Morse
Talk
(Android
App)
Use
Case
Encode
text
to
Morse
code
User
enter
text
Message
Send
Morse
code
via
flash
light
on-­‐off
paoern
Receiving
Part
Decode
Morse
code
from
camcorder
vision
and
convert
it
to
text

17. Morse
Talk
(Android
App)
§ Android
plaporm
base
applicaQon
implementaQon
§ OpenCV
(
computer
vision
open
source
library
)
porQng
§ Development
of
signal
decoding
algorithm
from
smart
phone’s
camcorder
vision.
§ Language:
C++,
Java.
Plaporm:
Android.
IDE:
Eclipse
User
Interface
Morse
Code
Translator
User
Interface
Signal
Decoding
Algorithm
Morse
Code
Encoder
Vision
Processor
Message
Sending
Processor
OpenCV
Library
Android
Framework
Android
Framework
Camera
Flash
Light
Module
Camera
Module
Flash
Light
On/Off
Sending
Part
Morse
Code
Paoern
Receiving
Part

18.
Call
ConfirmaQon
(
Android
App
)
Company
Personal
Group
Project
Customer
Android
Market
Responsibility
Ad
module,
DB
etc.
S/W
Development
Working
Site
Korea
Project
Period
2011

19.
Call
ConfirmaQon
(
Android
App
)
Use
Case
User
try
calling
It
requests
paoern
lock
password
Proceeds
dialing
aFer
user
unlock
password

20.
Call
ConfirmaQon
(
Android
App
)
§ Ad
module
implementaQon
§ White
number
list
data
base
and
Etc.
§ Language:
Java.
Plaporm:
Android.
IDE:
Eclipse
Call
Intent
User
Cauly,
Admob
White
Number
Processor
Interface
AD
module
List
DB
Android
Framework