Resume

Byoung-Jo “J” Kim  

Latest Resume in pdf 

Note) This picture is NOT of myself nor of any of my family members. Just a picture of a creature on the streets of Vancouver that seems to convey the feeling I have for resumes.   

Personal: macsbug a~~~t gmail d~~~o~~~t com

(note to humans: If you are indeed one, this  "~~~' bit shouldn't be an issue. )

Education

Stanford University

Ph.D. in Electrical Engineering.

Conferred in Sept. 1997. 

Advisor : Professor Donald C. Cox

Stanford University

M.S. in Electrical Engineering.

Conferred in Jan. 1995. 

Advisor : Professor Bernard Widrow

http://www-isl.stanford.edu/~widrow/ 

Seoul National University

B.S. in Electrical Engineering.

Conferred in Feb. 1993. 

Advisor : Professor U. H. Kwan. 

Demonstrated Strengths

• •  Understanding of underlining Fundamental Technical Principles

In wireless communications (4G, 5G & 6G wireless), radio propagation, computing, networking, TCP/IP, Network Latency, & network / host security, Software Defined Network & Big Data Analysis, enabling both in-depth and overall understanding of a system.

• Project Management Leadership

Equally comfortable as a team lead or individual contributor. Experienced in independent and self-motivated project development. Possess strong communication skills, often sought out for lucid and entertaining presentations and talks. Led and participated in research projects, hardware/software development, & network/service deployment projects under budget & time constraints.

• Strong Drive to acquire new knowledge and fuller understanding

On computing, communications, economy, biology, psychology & culture. A quick learner and capable, self-motivated researcher. Extensive knowledge of current technologies outside of main expertise.

•  Generating Creative and Innovative ideas and solutions                        

    Often a favorite sounding board for new ideas and solutions by my colleagues. Highly successful in leading brainstorming toward creative project ideas, next steps and innovative solutions. In- spires motivation and creative risk-taking in others who work with me. 

• Industry Trend Spotting and Active Participation & Leadership in Standards Activities

In IEEE 802.11, 802.16, 802.20, 802.21, 802.22, IETF, Wi-Fi Alliance, WiMAX Forum, 3GPP, GSMA. Recognized the potential of WLAN (802.11), the emergence of WLAN management issues, Multi-network Mobility, Mesh / Relay Network, Fixed Wireless Access, Latency Reduction, Software-defined Radio ( SDR ) and Software-Defined Network ( SDN )/ Network Function Virtualization( NFV ). Initiated projects in AT&T, industry collaborations and standards bodies to expedite and/or exploit these trends well before the rest of industry.

•  Inter-group Coordination for Large projects

Internal corporate-wide WLAN deployment, Secure guest access, Employee wireless remote access, Public WLAN hotspot deployment, Cellular Core network design, small cell deployment, cellular network optimization for dense venue events.

•  Structured Experiments, Prototyping and Hands-on Tinkering

Experienced in designing & conducting experiments of various scales and purposes, developing Proof-of-concept Hardware / Software Prototypes, and designing & deploying Test / Trial / Demo Networks.

• Wide-ranging interactions with startup companies, large enterprises and universities

Evaluation for capital investment, technology collaboration/transfer, vendor evaluation, standards collaboration, research collaboration, internship management. 

Experience 

Senior Research Scientist

                            Sept. 2023 to present

Peraton Labs – Network Research Group

Working on something Cool, I hope~

Principal Member of Technical Staff 

                            April 1998 to Sept. 2023

AT&T Labs – Research, Mobile Wireless Network Research Group

AT&T Labs – Special Projects Team

AT&T Mobility and Access Architecture – Ideation and Realization Group

Led and Participated in many Successful Projects on 802.16 / WiMAX, 802.11 / Wi-Fi, 3G / 4G / LTE / 5G / 6G Cellular Networks, and Mobile Networking, as well as Business Projects in support of various AT&T business units, and internal AT&T IT organizations. Learned Crucial lessons from not-so successful projects. Represented AT&T in and made technical contributions to IEEE 802.11/16/20/21/22 Working Groups, Wi-Fi Alliance, and WiMAX Forum.

Understanding Latency and its Mitigation

• Investigated and analyzed the sources of latency in 4G, 5G, DOCSIS, PON, and Wi-Fi networks and developed strategies to mitigate using L4S, AQM, and architectural techniques that promote adoptions and simplify implementations.

Next Generation Radio Access Network Design and Planning

• Participated in planning fiber networks to radio technologies using state-of-the-art technologies for RAN network for the next phase of AT&T network transformation.

Application of Wi-Fi 6E in access networks

• Innovative uses of Wi-Fi 6E to reduce cost and time in residential and MDU access networks. Pro- totyped equipment and service models. Led trials in actual locations.

Algorithmic Design and Optimization of Electro-Magnetic (E&M) Components in Wireless Systems

• Developed Genetic Algorithmic approaches for parametrically designed RF and E&M components for a new wireless system.

• Prototyped several resulting designs using 3D printing and tested for their effectiveness.

802.16 / WiMAX / 3GPP / 4G / 5G / 6G Cellular:

• • Current Interests: Extreme congestions in cellular and Wi-Fi networks during large events in stadiums, festivals, etc. Next Generation cellular architecture design and prototyping, enabling vast scaling and adaptation to different deployments. Understanding and mitigation of Latency & Bufferbloat in cellular network and devices. Performance and architecture of M2M and connected car services.

• All based on or inspired by Empirically-verified results obtained via simulation, experimentation, Big Data Analysis & Visualization.

• Analyzed large quantities of latency and other measurement data from cellular networks to understand sources of latency in LTE networks and ways to mitigate them.

• Developed optimization techniques for deploying small cell LTE networks over cost-effective fiber optic backhaul.

• Created new probabilistic approach to estimating fault rates at many different layers in real large- scale wireless network.

• Developed and analyzed a fundamentally different and superior architecture for the next genera- tion mobile cellular networks for and beyond LTE SAE EPC. 

  • Developed and analyzed various alternatives for next generation mobile cellular network architecture for packet data transport for WiMAX, 3GPP LTE EPC.

• Analyzed and prototyped alternative implementation strategies for cellular network functions via Software-Defined Network (SDN), Network Function Virtualization (NFV) and Cloud infrastructure.

• Devised and prototyped, using Software-Defined Radio (GNU Radio, USRP, ThinkRF), a battery- powered multiple transmitter/receiver channel sounding system that enables rapid and economic site survey of large areas, potentially displacing or augmenting site-specific propagation modeling.

• Analyzed sessions statistics to understand the impact of Push applications to the scalability of 3G and LTE SAE EPC networks

• Instrumented the power consumption of cellular base stations, including its support systems such as air conditioning. Developed models to understand the overall power consumption to discover the most cost-effective way of improving power efficiency.

• Proposed and analyzed a novel and practical Infrastructure Mesh architecture for broadband wireless access networks that substantially improves coverage and throughput performance.

  • Analyzed coverage, capacity of multi-cell WiMAX systems under various conditions and 802.16 PHY/MAC for performance comparisons

  • Analyzed & contributed various proposals and components of mobile WiMAX network architecture, especially in mobility management, security, multiple host support & radio resource management

  • Devised and proposed a new distributed and open network architecture for WiMAX based on Ethernet transport

  • Developed new practical approaches & analysis for mesh networking for 802.16 to reduce deployment cost,  improve capacity & coverage

  • Represented AT&T and Contributed to IEEE 802.16 WG and WiMAX forum, especially to the 802.16 Multihop Relay Study/Task Group (also instrumental in its formation), WiMAX Service Provider Working Group and Network Working Group. Instrumental in AT&T becoming a WiMAX Board member

  • Developed and compared techno-economic models for Mesh vs. traditional wireless access network topologies for WiMAX deployment

  • Led Security Architecture development for AT&T’s WiMAX trials

802.11 / WiFi :

• • Initiated and led Radio Resource Management (RRM), Large-Scale Deployment (Both using Large-Scale simulations and modeling), and WLAN User Location Tracking Projects and supported AT&T Business Services on the subjects. Thanks to my advocacy, RRM for WLAN has emerged as an important subject in the industry as large WLAN deployments become common.

  • Contributed to IEEE 802.11 (TGi) and Wi-Fi Alliance on Public WLAN Security issues, and started the 802.11 Task Group k for Radio Resource Measurement/Management and co-authored major portions of the specification.

  • Architected and led the deployment of Secure WLAN networks for Enterprise and Public Networks for external customers and AT&T’s internal use, with VPN-based Security, 802.1x/WPA/802.11i Security, policy establishment, threat assessment, advanced access control, guest access, backend infrastructure integration, process control and user support. This architecture serves as the blueprint for ongoing deployment of secure WLAN across AT&T.

  • Conducted Research on and provided solutions to AT&T's Public WLAN services regarding Security, Threat Assessment, Authentication (WPA, 802.11i, EAP/1x, and mixed security support), and 3G Internetworking (EAP-SIM/AKA, SS7 & Transport Interworking).

Internet Roaming:

• • iCard: Initiated and led the development of a secure multi-interface mobility manager implemented on a PC card form-factor Linux network node. All Mobility and Security functions are handled in iCard, hidden from host platform. Demonstrated at Mobicom’03.

  • Devised and Prototyped in software a method for Mobility Support for IPsec Tunnel Mode. For corporate remote access applications, this enables mobility across multiple subnets with minimal modifications and no additional overhead without compromising compatibility and existing security afforded by IPsec tunnels.

  • Led the Internet Roaming Project, an Enterprise-Oriented Secure Mobility Architecture, which enables corporate employees in the field to gain secure intranet access via a wide variety of access technologies, including cellular and public WLAN. This research project yielded more than a dozen patents (granted or pending)

Wireless Networks :

• Wireless Channel Information Services: Developed & prototyped an architecture for feedback of network-based information on radio link conditions, thus enabling real-time adaptation of mobile applications to optimize performance. Suitable for incremental deployment and server-based applications in existing networks.

• Research on EDGE/GPRS adaptive modulation, and wireless QoS for VoIP over EDGE. GPRS Core network QoS, QoS/Call signaling, and mobility. All-IP implementation issues for 3G.

• Led a project team for measurement and modeling of PDA and smart-phone traffic characteristics and user-perceived performance over an emulated 3rd generation mobile cellular network.

• Authored several AT&T Internal Policies for Secure Mobile Remote Access.

Broadband Fixed Wireless Access Field Trial :

Possibly the first deployment of two-way broadband fixed wireless system (in ’97), involving commercial cable modem, radio, and data equipment. Led the team that deployed and operated a 13 site fixed wireless network for friendly customers with automatic remote management systems for obtaining Operational Experience, Propagation Measurements, and User Adoption Issues. (Refer to IEEE Comm. Magazine, Oct. 1999)

Distributed CMTS System : 

Developed advanced DOCSIS-based cable modem network architecture for AT&T Broadband (now Comcast) next generation cable plant, and related Video on Demand systems. This architecture enables vastly higher network capacity and scalability by pushing digital transmission down to mini Fiber nodes and reusing RF channels independently for smaller groups of users.

System Analyst / Consultant

June 1996 to June 1997

Spectrum Wireless, Mountainview, CA

• • Modeled and analyzed System and Physical Link performance for GSM.

  • Evaluated options for Signal Processing for Macro Diversity for Cellular systems.

  • Built Large-Scale Channel Models and Simulators.

  • Consulted on Network Planning, Automatic Site Placement, Field Measurements

Research Assistant

April 1994 to February 1998

Stanford Wireless Personal Communications Research Group

• • Conducted research on Wireless System Modeling, Capacity, and Coverage issues, Dynamic Channel Allocation, Complexity, Signal Processing (equalization, synchronization, MLSE) for various cellular systems such as PACS, PHS, GSM, IS-54/136, IS-95, DECT.

  • Research on Blind Equalization, Blind Sequence Estimation, Blind Diversity Combining, Short Burst Wireless Receivers, involving Large-Scale Computer Simulations.

  • Developed new simulation models for various wireless Channel and Propagation Environments.

Teaching Assistant

 September 1996 to December 1996

Stanford University, Electrical Engineering 

• • High Frequency Laboratory Class at Stanford, EE dept. for graduate students on constructing and testing high frequency RF circuits.

Professional Associations :

Member of   

IEEE, IEEE Standards Association, Sigma Xi Scientific Society

Formerly Voting member of IEEE 802.11, 802.16, 802.20, 802.21, 802.22.

Publications

Patents: Refer to the pdf version of my resume