Research Areas

• Future Internet
  • Content-Oriented Network Architecture & Service
  • Optimal Content Distribution & Caching
• Misc.
  • Ubiquitous Sensor Networks: Interworking, IEEE 802.15.5
  • RFID Management System, Mobile RFID
  • Link Adaptation in Wireless LAN
  • Adaptive Video-Streaming using TCP-friendly Rate Control

Publications

International Journal

• Kideok Cho, Sangheon Pack, Ted "Taekyoung" Kwon, and Yanghee Choi, "An Extensible and Ubiquitous RFID Management Framework over Next-Generation Network," Wiley International Journal of Communication Systems (IJCS), Published Online: 29 October 2009.

  Radio frequency identification (RFID) is an enabling technology for a variety of applications in next-generation network (NGN). Although several RFID management frameworks are proposed in the literature, they have limitations in terms of service extension. In this paper, we propose an extensible RFID management framework called SIP-based RFID management system (SRMS), which can support various RFID applications. SRMS employs session initiation protocol (SIP), which is an Internet standard protocol adopted in NGN for session management and mobility support. SRMS enhances the existing SIP architecture by introducing a surrogate user agent (SUA) and an SRMS name server (SNS). The SUA performs SIP signaling on behalf of RFID tags with limited capabilities, whereas the SNS provides name resolution services. To illustrate the extensibility of SRMS, we demonstrate two representative application scenarios. Compared with the existing RFID management frameworks, SRMS has advantages of service extensibility and reusability.

• Jeongkeun Lee, Kideok Cho, Seungjae Lee, Taekyoung Kwon, and Yanghee Choi, "Distributed and energy-efficient target localization and tracking in wireless sensor networks," Elsevier Computer Communications (COMCOM), Vol. 29, No. 13-14, pp. 2494-2505, 21 August 2006.

  In this paper, we propose and evaluate a distributed, energy-efficient, light-weight framework for target localization and tracking in wireless sensor networks. Since radio communication is the most energy-consuming operation, this framework aims to reduce the number of messages and the number of message collisions, while providing refined accuracy.
  The key element of the framework is a novel localization algorithm, called Ratiometric Vector Iteration (RVI). RVI is based on distance ratio estimates rather than absolute distance estimates which are often impossible to calculate. By iteratively updating the estimated location using the distance ratio, RVI localizes the target accurately with only three sensors’ participation.
  After localization, the location of the target is reported to the subscriber. If the target is stationary or moves around within a small area, it is wasteful to report (almost) same location estimates repeatedly. We, therefore, propose to dynamically adjust a reporting interval considering the target's movement so that we can reduce the report messages without loss of tracking quality. Extensive simulation results show that the proposed framework combining RVI and the movement-adaptive report scheduling algorithm reduces the localization error and total number of transmitted messages up to half of those of existing approaches.

International Conference

• Jinyoung Han, Jeongkeun Lee, Munyoung Lee, Kideok Cho, Tae Joon Ha, Ted "Taekyoung" Kwon, and Yanghee Choi, "Virtual WiFi Network Database Construction for Positioning Services," in Proc. of International Conference on Future Internet Technologies (CFI) 2009, Seoul, Korea, June 2009.

  WiFi-based location based services (LBSs) are expected to be more and more pervasive in future Internet. In WiFi networks, a virtual network database (VNDB), which maintains the estimated locations of access points (APs), should be constructed for the localization. Since the quality of the LBS is mainly determined by the location accuracy, it is essential to maintain accurate VNDBs for the LBS. In this paper, we propose two novel filtering methods to construct accurate VNDBs for the WiFi-based localization: RSS filtering and grid-based filtering. Experimental results on a real testbed show that the proposed methods construct a VNDB accurately and localization results with the accurate VNDB are comparable to those with a real network database (RNDB).

• Kideok Cho, Munyoung Lee, Dong-il Diko Ko, Taekyoung Kwon, and Yanghee Choi, "An Efficient Multicast Routing in IEEE 802.15.5 Networks," in Proc. of International Conference on Information Networking (ICOIN) 2009, Chiang Mai, Thailand, January 2009.

  The IEEE 802.15.5 standard for WPAN mesh adds mesh links to a tree structure for efficient communications for unicast routing. However, for multicasting, the basic tree routing scheme which does not exploit mesh links is adopted, which leads to inefficient multicasting. In this paper, we propose 'MTM (Multicast Tree with Mesh)' routing scheme which leverages mesh links for multicast routing. The proposed scheme shows better performance than the basic tree routing of IEEE 802.15.5 standard in terms of the number of participating nodes in multicast trees, control message overhead, and the number of data transmissions.

• Kideok Cho, Jaeyoung Choi, Dong-il Diko Ko, Taekyoung Kwon, and Yanghee Choi, "Content-Oriented Networking as a Future Internet Infrastructure: Concepts, Strengths, and Application Scenarios," in Proc. of International Conference on Future Internet Technologies (CFI) 2008, Seoul, Korea, June 2008.

  While the current Internet architecture is designed based on the host-to-host communication paradigm, the real Internet usage shows that content-oriented traffic is dominant. In other words, users do care about not from whom they retrieve data but the data itself. A recent report analyzes that most of the Internet traffic is dominated by P2P traffic which does not conform to the hostto-host paradigm. Due to the inconsistency between the Internet design and the real usage, there is an unnecessary indirection overhead when users try to retrieve desired data. In consequence, it is needed to redesign the Future Internet based on the content-centric paradigm to provide data/contents to the users efficiently. In this paper, we define the concepts of content-oriented (networking) paradigm. Also, strengths and application scenarios of content-oriented networks (CONs) will be investigated.

• Hakyung Jung, Kideok Cho, Yongho Seok, Taekyoung Kwon, and Yanghee Choi, "RARA: Rate Adaptation Using Rate-adaptive Acknowledgment for IEEE 802.11 WLANs," in Proc. of IEEE Consumer Communications & Networking Conference 2008, Las Vegas, USA, January 2008.

  The IEEE 802.11 standards support multiple bit rates at the physical layer so that stations can maximize the system performance by controlling the transmission rate responding to the conditions of underlying time-varying channels. This paper proposes a novel scheme, termed as Rate Adaptation using Rate-adaptive Acknowledgment (RARA). The key idea of RARA is to regulate the ACK transmission rate as a means to dictate the sender to adjust the data transmission rate. Compared with previous works, the proposed scheme can react quickly to the prevailing conditions by the receiver-based decision while inducing marginal overhead. Simulation results show that the RARA consistently outperforms other rate adaption schemes.

• Kideok Cho, Sangheon Pack, Taekyoung Kwon, and Yanghee Choi, "SRMS: SIP-based RFID Management System," in Proc. of IEEE International Conference on Pervasive Services (ICPS) 2007, Istanbul, Turkey, July 2007.

  Radio frequency identification (RFID) is a new technology for object identification/tracking systems. In this paper, we propose a novel RFID location management system: SIP-based RFID management system (SRMS). SRMS employs session initiation protocol (SIP), which is an Internet standard protocol for session management and mobility support. SRMS enhances the existing SIP architecture by introducing a surrogate user agent (SUA) and an SRMS name server (SNS). The SUA performs location registration procedures on behalf of RFID tags with limited capabilities, while the SNS provides name resolution services for location registration/tracking of RFID tags. To evaluate the location registration latency in SRMS, we carry out performance analysis based on queueing models. Compared with the existing RFID management systems, SRMS has advantages of service extensibility and reusability.

• Min Zhang, Sangheon Pack, Kideok Cho, Dukhyun Chang, Yanghee Choi, and Taekyoung Kwon, "An Extensible Interworking Architecture (EIA) for Wireless Sensor Networks and Internet," in Proc. Asia-Pacific Network Operations and Management Symposium (APNOMS) 2006 Poster Sessions, Busan, Korea, September 2006.

  One of representative applications of wireless sensor networks (WSNs) is a data collecting system that monitors and gathers physical phenomena in an area of interest. To build an end-to-end data collecting system, how to efficiently integrate WSNs with the Internet should be investigated. In this paper, we first present important design considerations regarding interworking between these two networks and review the existing interworking approaches: gateway-based and overlay-based approaches. Then, we propose a new interworking architecture, extensible interworking architecture (EIA), which forms overlay sensor networks (OSNs) over Internet. EIA employs two advanced functions to improve the data gathering efficiency: application layer graph (ALG) and distributed caching. Compared with previous works, EIA can meet the design requirements on the WSN/Internet interworking more efficiently.

Domestic Journal

• Kideok Cho, Yongwoon Park, Taekyoung Kwon, and Yanghee Choi, "QoS-guaranteed Multimedia Streaming for Multiple Interfaces," in Proc. of Journal of KIISE: Information Networking, Vol. 36, No. 3, pp. 191-197, June 2009.

  One of popular applications in the Internet is the multimedia streaming services such as IPTV or YouTube in which supporting quality of service (QoS) is an important issue. One of widely adopted rate control scheme is TCP-friendly rate control (TFRC) which shows comparable performance with TCP in term of throughput and lower variation of throughput over time. On the other hand, devices with multiple interfaces are emerging in the market. However, it has not proposed to exploit multiple interfaces simultaneously for multimedia streaming services with TFRC. In this paper, we propose a multimedia streaming algorithm with TFRC which exploits multiple interfaces to guarantee the quality of service. We show that the proposed scheme shows better performance than those with a single interface in terms of throughput and communication costs.

• Sangheon Pack, Min Zhang, Dukhyun Chang, Kideok Cho, Yanghee Choi, and Taekyoung Kwon, "A Survey on Integration Schemes of Wireless Sensor Networks and Internet for Ubiquitous Sensor Networks," SK Telecommunications Review, Vol. 15, No. 2, April 2005.

  최근 유비쿼터스 센서 네트워크(USN: Ubiquitous Sensor Network)를 구성하여 미래의 유비쿼터스 환경을 구축하려는 연구가 활발히 진행되고 있다. 유비쿼터스 센서 네트워크에서는 무선 센서 네트워크 상의 센싱 장치를 통해 주변의 상태 정보를 습득하고 이를 처리한 후 무선 인터페이스를 통해 다른 노드로 전달하게 된다. 이러한 무선 센서 네트워크의 가장 대표적인 응용 프로그램은 우리 주변에 산재한 물리적 현상을 감지하여 이를 수집, 모니터링하는 데이터 수집 응용 프로그램이다. 이러한 응용 프로그램의 경우 무선 센서 네트워크는 하나의 데이터 베이스로 간주할 수 있고 무선 센서 네트워크에 대한 질의는 일반적으로 인터넷에 연결된 호스트가 보내게 된다. 따라서 무선 센서 네트워크와 인터넷을 효과적으로 연동하는 기술은 유비쿼터스 센서 네트워크 구현을 위한 핵심 기술이다. 본 논문에서는 지금까지 제안된 다양한 무선 센서 네트워크와 인터넷의 연동 기법들에 대해서 살펴본다. 연동 기법은 크게 무선 센서 네트워크와 인터넷 사이에 위치하는 게이트웨이를 이용하여 두 네트워크 사이의 변환을 처리하는 게이트웨이 기법과 인터넷 또는 센서 네트워크 상에 별도의 오버레이 네트워크를 구성하여 연동하는 기법으로 나뉠 수 있다. 그리고 오버레이 기법은 무선 센서 네트워크 상에 IP 오버레이 네트워크를 구성하는 기법과 인터넷 호스트 상에 센서 네트워크의 프로토콜을 구현하여 오버레이 무선 센서 네트워크를 구성하는 기법으로 나뉠 수 있다. 본 논문에서는 이러한 각 기법의 특성을 기술하고 각 기법이 가지는 장점과 단점을 비교한다. 그리고 무선 센서 네트워크와 인터넷의 연동과 관련된 이슈와 추후 연구 주제 등에 대해서 정리한다.
  ※ The original paper was written in Korean. Summary written in English is not ready yet.

Domestic Conference

• 7 domestic conference papers. (Related information is available upon request.)

Patents

• Dong-il Ko, Kideok Cho, Munyoung Lee, Taekyoung Kwon, and Yanghee Choi, "A Hybrid Network Apparatus for Combining an Endpoint-Oriented Networking and a Content-Oriented Networking, and Method of Using Thereof," Korea Patent, No. 10-2008-0136464, Pending, December 2008.

• Dong-il Ko, Kideok Cho, Munyoung Lee, Taekyoung Kwon, and Yanghee Choi, "A Network System and Method thereof with DACON," Korea Patent, No. 10-2008-0055721, Pending, June 2008.

Resume

Summary

• Ph.D. candidate at Seoul National University
• Birth: 15 July 1980
• Given name: Kideok (기덕 in Korean)
• Family name: Cho (조 in Korean)

Education

• Ph.D. in School of Computer Science and Engineering, Seoul National University, Korea, 2004.9 - present
   (Integrated MS-Ph.D. Course, Advisors: Yanghee Choi and Taekyoung Kwon)
• B.S. in School of Computer Science and Engineering, Seoul National University, Korea, 2000.3 - 2004.2

Professional Activities

• Committee
  • Student Committee Co-chair of AsiaFI School on Mobile & Wireless Networks 2010
  • Student Committee Co-chair of Future Internet Summer Camp 2008
  • Student Committee Co-chair of AsiaFI School on Architecture and Building blocks 2008
  • Student Committee Co-chair of AsiaFI School on Mobile & Wireless Networks 2008
  • Steering Committee of Graduate Workshop on Networking 2007
• Reviewer
  • Elsevier Journal of Network and Computer Applications (JNCA)
  • Wiley International Journal of Communication Systems (IJCS)
  • IEEE GLOBECOM 2007, ICC 2006, MASS 2005/2008, WCNC 2009/2010
  • IEEE/Create-Net COMSWARE 2007/2008
  • Innovations in Information Technology 2007, K-INGN 2008
  • Summer Workshop on Computer Communications (SWCC) 2007, ICOIN 2008/2009
• Internship
  • Network Academy in Samsung Networks, Summer, 2002
• Visiting Researcher
  • 2006.12 - 2007.5: Advanced Wireless Networking Lab (AWNL) at City University of New York (Advisor: Prof. Myung J. Lee)
• Technical Secretary
  • Future Internet Forum, August 2006 - present
  • Korea Conference on Innovative Science and Technology (KCIST) 2006 - Conference on "Internet of the Future", November 2005 - July 2006
• Teaching Assistance
  • Fall Semester 2006, Topics in Internet (Grad. Course)
  • Spring Semester 2006, Colloquium on Advanced Computer Engineering (Grad. Course)
  • Fall Semester 2005, Computer System Design Experiment (Undergrad. Course)
  • Fall Semester 2004, Advanced Internet (Grad. Course)
• Server Administrator of Multimedia & Mobile Communication Lab. 2004.12 - 2005.11
• Student member of IEEE, IEICE, KICS, KIISE
• Assistant for the tour of inspection in Seoul National University, 2003

Awards and Honors

• The Prize for Encouragement in the 2nd TTA IT Standardization Paper Contest, December 2006. (joint work with Sangheon Pack, Title: Ubiquitous Mobile RFID Management Framework based on IP Multimedia Subsystem)
• The Prize for Encouragement in the 1st TTA IT Standardization Paper Contest, December 2005. (joint work with Sangheon Pack, Title: A Study on RFID Management System based on SIP)
• Magna Cum Laude (BS) - February 2004, Seoul National University.
• Scholarship from the Korea Student Aid Foundation (KOSAF), 2009 - 2010.
• Scholarship from the Sinyang Cultural Foundation, 2001 - 2003.
• School of Computer Science and Engineering Scholarship, 2000, Seoul National University.

Project Experiences

• Future Internet Network Model Development
   sponsored by Korea Research Council of Fundamental Science & Technology (KRCF) (2008.12 - present)
• Fundamental technologies for the Future Internet
   sponsored by Ministry of Information and Communication (MIC) (2007.09 - present)
• Ubiquitous Content Service in the Future Internet
   sponsored by National Information Society Agency (NIA) (2008.07 - 2008.12)
• Ubiquitous Zone Project
   sponsored by Ministry of Information and Communication (MIC) (2007.03 - 2008.02)
• Development of an Adaptive Immersive 3D Networked Virtual Environment
   sponsored by Incheon IT Promotion Agency (IITPA) (2006.01 - 2007.02)
• Integration of Wireless Sensor Networks and Internet
   supported by Korea Science and Engineering Foundation (KOSEF) (2004.9 - 2007.8)

Language

• Korean (Native), English (Intermediate)

Computer Related Skills

• Programming Languages: C++, Java, Visual C++, Visual Basic, nML, Python
• OS: MS Windows, Linux/FreeBSD, TinyOS, Nano-Qplus
• Tools: Oracle, QualNet, NS2

Reference

• Prof. Yanghee Choi, School of Computer Science and Engineering, Seoul National University (yhchoi AT snu.ac.kr)
• Prof. Taekyoung Kwon, School of Computer Science and Engineering, Seoul National University (tkkwon AT snu.ac.kr)
• Prof. Myung J. Lee, Department of Electrical Engineering, City University of New York (lee AT ccny.cuny.edu )
• Prof. Sangheon Pack, School of Electrical Engineering, Korea University (shpack AT korea.ac.kr)

Useful Links

• Computer Science citations
• Networking and Communication CFPs
• Conference Statistics
• Estimated impact of publication venues in Computer Science
• Networking Conference Dates
• Science Citation Index (SCI) Journals
• Science Citation Index Expanded (SCIE) Journals
• JCR Web: Journal Impact Factor
• Computer Science Faculty Job Search Resources
• Common Bugs in Writing



• Helpful Readings (maintained by me)