Sangho Shin
sangho@cs.columbia.edu http://www.cs.columbia.edu/~ss2020
EDUCATION
2003-2008.2 Ph.D. Candidate in Computer Science
Advisor: Henning Schulzrinne
Thesis topic: Quality of
Service for VoIP traffic in IEEE 802.11 Wireless Networks
2001-2002 Master of Science in Computer Science
GPA 3.899/4.0
1996-1998 Bachelor of Science in Computer Science &
Engineering
GPA 3.84/4.5
1992-1996 Bachelor of Engineering in Mechanical
Engineering
RESEARCH EXPERIENCE
2005.7 ~ present Measurement of the Capacity for
VoIP traffic in IEEE 802.11 via Experiments
Measured the capacity for VoIP traffic in a test-bed using actual
wireless nodes and analyzed the results.
2005.7 ~ present Call Admission Control in IEEE
802.11 Wireless Networks using Virtual Traffic Generation
Developed a novel call
admission control algorithm called QP-CAT, which predicts the delay of VoIP
traffic precisely and performs admission control efficiently.
2006.3 ~ 2006.12 Measurement and Analysis of IEEE
802.11 WLAN Traffic in the Large
Measured 802.11 WLAN traffic in
the IETF meeting 2006 and analyzed the load balancing and handoff behavior of
wireless clients and the APs.
2005.4 ~ 2006.5 Adaptive Priority Control (APC)
for VoIP traffic in IEEE 802.11 Wireless Network
APC balances the uplink and downlink delay by improving the fairness
between uplink and downlink adaptively. It also improves the capacity for VoIP
traffic in IEEE 802.11 Wireless Networks.
2004.10~2005.11 Passive Duplicate
Address Detection (P-DAD) in DHCP
Proposed a
framework for DHCP server to detect duplicate IP addresses without incurring
additional delay to clients, when a new IP is requested. This enables clients to do L3 handoff faster.
2004.1~2005.7 Seamless Layer 2 Handoff in IEEE
802.11 using Two Radios
Achieved seamless layer 2
handoff using two radios and passive scanning, and proposed Selective Passive Scanning
to reduce the false handoff possibility.
2004.8~2005.7 Seamless
handoff between subnets in Wireless Networks
Created an algorithm for reducing L3 handoff time,
and implemented it using a DCHP client and hostAP driver in Linux.
2004.3~Present
Improving Capacity of VoIP in IEEE 802.11 Wireless Networks
Created
a modified PCF scheme, Dynamic PCF, and implemented it in QualNet Simulator and
verified Dynamic PCF improved the capacity of VoIP by 20%.
2003.9~2004.2 Fast
L2 handoff in IEEE 802.11 Wireless Networks
Created
a novel algorithm for seamless L2 handoff and implemented the algorithm with
hostAP driver, and reduced handoff time to 2~4 ms. This technology is patented, and received a
2004 Product of the Year Award from INTERNET TELEPHONY ® magazine (www.itmag.com). Also, I implemented the algorithm in a Broadcom
wireless card chipset.
2003.1~2003.8
Development of SIP VoIP client in PDA
Implemented a VoIP client that supports Instant Message
and Presence in SHARP Zaurus PDA using CINEMA library.
2002.6~2002.12
Implementation of SIP Servlet API 1.0
Implemented
SIP Servlet API 1.0, and upgrade of SIP servlet user
policy in SIP proxy server using the API.
2002.1~2002.5
Implementation of SIP Servlet API 0.5
Implemented
SIP Servlet API 0.5 and integrated the SIP Servlet into our SIP proxy server
for allowing user to create user specific call control policies.
EMPLOYEMENT
2001-2001 Final Solution
Co.
Researcher
Development of Linux
Embedded System
1998-2000 LG-Hitachi Ltd.
Software
Engineer
Development of New Customer
System of
Development of Management System of the
Maintenance of Personnel
Management System of NTT Docomo
1998-1998 LG-Soft Ltd.
Software
Engineer
Development of TOIEC
Learning Web Site
1998 Samsung Financial Network
Development of Chatting
System of Samsung Financial Network Homepage
1996
Development of the Management
System of The Record of Baduk(Go)
1995-1996 The Supreme
Public Prosecutors’ Office,
Development of the Management
System of Election Illegalities
(Standalone
version and Client/Server version)
EXTRA CURRICULUM ACTIVITY
2007 a local organizer chair
in IPTComm Conference
2007 a reviewer of ACM
TOMCCAP (Transaction on Multimedia Computing, Communications and
Applications)
2007 a reviewer of IEEE
Internet Computing
2007 a reviewer of Springer
Wireless Networks
2007 a reviewer of International
Conference on
2006 a reviewer of IEEE
Symposium on a World of Wireless,
2004 a local organizer in ACM
Multimedia Conference 2004 in
1992-1998 Korea University Electric &
Electronic Research Association
Development of Printer
Buffer and Sharing Machine, DXF File Viewer, WEB BBS, Internet Game ‘Bumper
Car’ etc.
Planning research products
exhibitions
1996-1998 System
Research (SyRes), an association in Computer Science & Eng.
Development
of Self-evolvement System with Java.
Lectured in Windows
System, Linux Kernel, Unix Network
HONORS
2001-2004 Scholarship of
Ministry of Information and Communication
1998 General Scholarship for
the high academic performance
PUBLICATION
Sangho Shin and Henning
Schulzrinne.
Call Admission Control in IEEE 802.11 WLANs
using QP-CAT,
accepted in INFOCOM 2008, April
Sangho Shin and Henning
Schulzrinne.
Experimental
measurement of the capacity for VoIP traffic in IEEE 802.11 Wireless Networks, INFOCOM 2007, May,
Sangho Shin, Andrea
G. Forte, and
Henning Schulzrinne.
Passive
Duplicated Address Detection (pDAD),
Globecom 2006
Sangho Shin and Henning Schulzrinne.
Passive
Balancing uplink and downlink delay of VoIP traffic in IEEE 802.11 Wireless
Networks using Adaptive Priority Control (APC), International Conference on Quality of Service in Heterogeneous
Wired/Wireless Networks (QShine), 2006
Andrea
G. Forte, Sangho
Shin and Henning Schulzrinne.
Improving Layer 3 Handoff in IEEE 802.11
Wireless Networks
International
Wireless Internet Conference (WICON), 2006
Sangho Shin, Andrea
Forte and Henning Schulzrinne.
Seamless
Layer 2 Handoff using Two Radios
Andrea G. Forte,
Sangho Shin, and Henning Schulzrinne.
Internet-draft: Passive Duplicate Address
Detection in DHCP
Sangho Shin, Andrea
Forte, Anshuman Rawat and Henning Schulzrinne. Reducing MAC Layer
Handoff Latency in IEEE 802.11 Wireless LANs a proceeding of ACM MobiWAC,
2004
Shin, Sangho (2000), A Translation of ‘A Programmer's Guide to Jini Technology (APress)’,
InfoBook,
Shin, Sangho (1997), A Translation of ‘Learning JDBC in 21 Days’, InfoBook,
Park,Jun-Hyoung, Shin,Sangho (1997), Benchmark Test of Java Development Tools,
HOW PC (8)
Under review
Sangho Shin and Henning
Schulzrinne.
Measurement
of the capacity for VoIP traffic in IEEE 802.11b/e Wireless Networks, Submitted to an IEEE journal
Submitted to an IEICE journal
Andrea G. Forte,
Sangho Shin, and Henning Schulzrinne.
IEEE 802.11 Traffic in the Large: Measurement
in a IETF meeting,
Submitted
to an IEEE conference