Lloyd Clark
 
Voice:1 512 331 3523
Fax:1 512 331 3320
Email:ldclark@austin.apc.slb.com
Homepage:http://www.austin.apc.slb.com/~ldclark
Languages:English

 


Assignment History/Experience - Current Projects and Areas of Interest - Education - Expertise - External Contacts - Patents and Patent Applications - Personal Interests - Personal Statement - Professional Achievements - Professional Qualifications and Affiliations - Publications


Personal Statement
Lloyd Clark is a Principal Engineer in the Acquisition Systems department at the Austin Technology Center, and previously was a Research Scientist in the End-to-End Simulation department at APC-Research.
Current Projects and Areas of Interest
Lead the technical development of Schlumberger's next-generation wireline telemetry system. This telemetry system will be based on DMT (Discrete Multi-Tone) modulation, similar to that used in ADSL and VDSL. Other areas of interest include error-correction coding and wireless communications.
Expertise
Community  Electrical
SIGsTelecommunications
 Electrical Design
 Signal Processing
InterestsSystem Architecture and Design
Applied Mathematics
Borehole Seismic
Embedded Software
OtherCommunication Theory
Wireless Communication
Analog Design
Digital Design
MatLab
Visual Basic
Electrical/electronics
Signal Processing (both Analog and Digital)
Analog Circuit Design
Digital Circuit Design
Instrumentation
Thermal Printer Physics
Data Acquisition
Assignment History/Experience

1999-present, Principal Engineer, Austin Technology Center, Austin, Texas, USA
Leading technical development of next-generation wireline telemetry system. Supervised a Ph.D. thesis (Biao Lu, UT Austin).

1997-1999, Research Scientist, Austin Product Center-Research, Austin, Texas, USA
Collaborated with RMS-Norcross to develop wireless metering simulation and optimization techniques that were directly applied to a major RMS contract with Illinois Power. Developed simulations of DMT (Discrete Multi-Tone) telemetry on wireline logging cable. Visited Geco-Prakla (Norway) to learn more about their land-seismic telemetry system and determine whether it could be adapted to wireline telemetry. Evaluated wireless LANs (Local Area Networks) and an experimental 2-kilometer wireless Ethernet link. Developed a comparative spreadsheet for Omnes to use when selecting last-mile wireless links. Worked with Vector Product Center to identify, select, and interview candidates for a telemetry/electrical engineer position at their facility. Participated in a technical review of the Schlumberger-Baker Intelligent Completion System, and continued to provide telemetry consulting throughout that project.

1993-1997, Senior Engineer, Austin Systems Center, Austin, Texas, USA
Led the architectural design of the WAFE (Wireline Acquisition Front End), and performed the detailed design of several WAFE components, including the WFDD (WAFE Depth Display) and TMAI (Tool Module Analog Interface). Worked with SKK to design the STGC (Slimhole Telemetry Gamma-ray Cartridge), then spent a month at SKK to help integrate, test, and debug the first protoype. Led the architectural design of the WITM (WAFE Integrated Tool Module) and then wrote the WITM DSP code to implement four different telemetry systems (Tel-B, CTS, DTS, and MTS). Also designed downhole portions of MTS (Monocable Telemetry System), and made several visits to SRPC to help debug and test MTS. Mentored several Schlumberger summer interns and supervised two M.S. theses (Heather Campbell, MIT and Mike Cheng, UT Austin).

1990-1993, Project Engineer, Austin Systems Center, Austin, Texas, USA
Participated in the feasibility study that led to the MBM (MonoBay MAXIS) wireline logging system: evaluated SCSI bus performance, designed a TURBOchannel interface, and investigated implementation of a TURBOchannel array processor. Worked with SKK to define a SCSI protocol for printers that both ASC and SKK could use for future SCSI printer development. Designed a high-speed (4 inch/sec) SCSI TGRP printer that was subsequently manufactured at SKK for many years. Also assisted SKK with the development of the SCSI CGR printer and Anadrill with integration of SCSI printers. Visited EPS (Melun, France) and SWS (Houston) to integrate, test, and debug the first MBM prototypes in their carriers.

1986-1987, Whitehead Institute, Cambridge, Massachusetts, USA
Designed a microprocessor-based DNA gel pulser which achieved improved separation of DNA molecules.

Summer 1984 & 1983, Production Services Corporation, Cambridge, Massachusetts, USA
Designed hardware and software for automatic testing of integrated circuits including the 68000 and 80186 microprocessors.

1982-1984, MIT Center for Materials Science and Engineering, Cambridge, Massachusetts, USA
Designed and constructed circuitry to allow a NOVA 3/12 minicomputer to control the scanning of a transmission electron microscope. Wrote assembly language software. Also constructed digital interface between the NOVA 3/12 computer and a PDP-11.

Spring 1983, Paton Engineering Research, Lexington, Massachusetts, USA
Designed and constructed filter, amplifier, and signal processing circuits for various applications.

Summer 1982, International Harvester, Hinsdale, Illinois, USA
Selected and interfaced sensors for a Cincinnati Milacron T3 robot which was used in a loosely-fixtured object retrieval application.

Summer 1981, Naval Electronic Systems Engineering Center, Norfolk, Virginia, USA
Repaired and aligned VHF transceivers from U.S. Navy ships. Wrote programs that performed automated transceiver testing.

Summer 1979, MIT Solid State Physics Group, Cambridge, Massachusetts, USA
Research involving preparation of superconducting materials and X-ray measurement of their characteristics. Responsibilities included operation of X-ray diffraction equipment, circuit design, and software for processing raw X-ray crystallography data.

Education

Ph.D., Massachusetts Institute of Technology, Cambridge, Massachusetts, USA, June 1990
Major: Electrical Engineering and Computer Science
Thesis Title: A System For Chronic Neural Signal Transduction, Processing, and Control
Advisor: D.J. Edell

M.S., Massachusetts Institute of Technology, Cambridge, Massachusetts, USA, February 1986
Major: Electrical Engineering and Computer Science
Thesis Title: A Photon-Camera Star Tracker for Stellar Interferometry
Advisor: D.H. Staelin

B.S., Massachusetts Institute of Technology, Cambridge, Massachusetts, USA, June 1984
Major: Electrical Engineering and Computer Science

Professional Qualifications and Affiliations
IEEE (Institute for Electrical and Electronics Engineers)
IEEE Communications Society
IEEE Information Theory Society
IEEE Antennas and Propagation Society
Personal Interests
Born and raised in Portsmouth, Virginia, USA. Enjoy basketball, volleyball, and bicycling. Also enjoy ham radio (call sign AG4D).
External Contacts
David J. Edell, MIT Lincoln Laboratory
Professional Achievements

National Science Foundation Graduate Fellow, 1984-1987

Whitaker Health Sciences Fund Fellow, 1988-1990

Publications and Presentations

Lu, B., L.D. Clark, G. Arslan, and B.L. Evans, "Fast Time-Domain Equalization for Discrete Multitone Modulation Systems", IEEE Digital Signal Processing Workshop, October 15-18, 2000, Hunt, Texas.

Lu, B., L.D. Clark, G. Arslan, and B.L. Evans, "Discrete Multitone Equalization Using Matrix Pencil and Divide-and-Conquer Methods", IEEE Transactions on Signal Processing, in progress.

Clark, L.D., "Automated Methods for Selecting Repeater (BSR) Poles", Illinois Power, Decatur, Illinois, February 1999.

Clark, L.D., "Automated Repeater Site Selection for Wireless Metering Systems", Austin Product Center, Austin, Texas, February 1999.

Clark, L.D., "Automated Methods for Selecting BSR Poles", Resource Management Services, Norcross, Georgia, December 1998.

Clark, L.D., "Wireline Telemetry, ADSL, and Wireless Communications", presentation to University of Texas freshman course on career opportunities in electrical engineering, Austin, Texas, October 1998.

Steiner, J., and L.D. Clark, "Effects of Power Noise on Telemetry", Powercom 21 Workshop, Austin Product Center, Austin, Texas, September 1998.

Clark, L.D., and J. Steiner, "ADSL/DMT on Wireline: Feasibility Report", Austin Product Center, Austin, Texas, May 1998.

Clark, L.D., "Channel Capacity of Wireline Cables", Advanced Cable Workshop, Vector Product Center, Sugar Land, Texas, January 1998.

Clark, L.D., "Simulation Strategies for Wireline Telemetry", Data Compression Workshop, Schlumberger Cambridge Research, Cambridge, England, July 1997.

Clark, L.D., "Introduction to ADSL (Asymmetric Digital Subscriber Line)", Schlumberger Signal Processing Workshop, Austin Product Center, Austin, Texas, February 1997. Also available as a slide presentation.

Clark, L.D., "The Evolution of Wireline Telemetry Systems", Schlumberger Telemetry Workshop, Sugar Land Product Center, Sugar Land, Texas, 1995.

Clark, L.D., taught portions of schools on the MCM (Minimum Configuration MAXIS) for Wireline & Testing field engineers and technicians, Austin Systems Center, Austin, Texas, 1995 & 1996.

Clark, L.D., et. al., "WAFE Maintenance Manual", Austin Systems Center, Austin, Texas, 1995.

Clark, L.D., taught portions of a school on MBM (MonoBay MAXIS) for Wireline & Testing field engineers and technicians, Austin Systems Center, Austin, Texas, 1993.

Clark, L.D., et. al., "MBM (MonoBay MAXIS) System Maintenance Manual", Austin Systems Center, Austin, Texas, 1993.

Clark, L.D., et. al., "TGRP-CAA (SCSI TGRP) Maintenance Manual", Austin Systems Center, Austin, Texas, 1993.

Edell, D.J., V.V. Toi, V.M. McNeil, and L.D. Clark, "Factors Influencing the Biocompatibility of Insertable Silicon Microshafts in Cerebral Cortex", IEEE Transactions on Biomedical Engineering, June 1992, vol. 39, no. 6, pp. 635-643.

Clark, L.D., et. al., "SCSI TGRP Specifications Document", Austin Systems Center, Austin, Texas, 1991.

Clark, L.D., et. al., "SCSI Protocol for Printers Specification Document", Austin Systems Center, Austin, Texas, 1991.

Clark, L.D., et. al., "TURBOchannel GUIbus Master Specifications Document", Austin Systems Center, Austin, Texas, 1991.

Clark, L.D., and D.J. Edell, "A Probabilistic Approach to the Design of Microelectrode Layouts for Neural Signal Transducers", IEEE Engineering in Medicine and Biology Society 11th Annual Conference, Seattle, Washington, November 1989.

Clark, L.D., J.L. Lund, and D.J. Edell, "Cesium Hydroxide (CsOH): A Useful Etchant for Micromachining Silicon", IEEE Sensor and Actuator Workshop, Hilton Head, South Carolina, June 1988.

Clark, L.D., and D.J. Edell, "Electrode Spacing Considerations for Neural Signal Transducers", IEEE Engineering in Medicine and Biology Society 9th Annual Conference, Boston, Massachusetts, November 1987.

Clark, L.D., M. Shao, and M. Colavita, "A Photon-Camera Star Tracker for Stellar Interferometry", SPIE Instrumentation in Astronomy VI, Tucson, Arizona, March 1986.

Clark, L.D., and A.J. Garratt-Reed, "Application of Computer Control to Scanning Transmission Electron Microscope", Forty-first Annual Meeting of the Electron Microscopy Society of America, Phoenix, Arizona, August 1983.

Clark, L.D., N. Webber, and T. Sutton, "Adaptive Control of the T3 Robot", 13th International Symposium on Industrial Robots/Robots 7 Conference, Chicago, Illinois, April 1983.

Patents and Patent Applications

U.S. Patent Number 5,483,232, granted 1996. Method and Apparatus For Predicting Peak Voltage of a Cable Conveyed Tool.

U.S. Patent Number 5,736,936, granted 1998. Method and Apparatus For Predicting Peak Voltage of a Cable Conveyed Tool.

Two patents are currently in progress.


Updated November 1, 2000