## Publications

Last Updated: September 18, 2008

## International journal papers

- J.Choi,
R.Nagamuneand R.Horowitz,

``Multiple Robust Track-following Controller Design in Hard Disk Drives,''

International Journal of Adaptive Control and Signal Processing, Volumn 22, Issue 4, 2008, Pages: 359-373.- G. Fanizza, J. Karlsson, A. Lindquist, and
R.Nagamune,

``Passivity Preserving Model Reduction by Analytic Interpolation,''

Linear Algebra and Its Applications, no.425, pp.608-633, 2007- G.Fanizza and
R.Nagamune,

``Spectral Estimation by Least-squares Optimization based on Rational Covariance Estimation,''

Automatica, vol.43, no.2, pp.362-370, 2007 (pdf-file)- X.Huang,
R.Nagamuneand R.Horowitz,

``A Comparison of Multirate Robust Track-following Control Synthesis Techniques for Dual-stage and Multisensing Servo Systems in Hard Disk Drives,''

IEEE Transactions on Magnetics, vol.42, no.7, pp.1896-1904, 2006 (pdf-file)- R.A.de Callafon,
R.Nagamuneand R.Horowitz,

``Robust Dynamic Modeling and Control of Dual-stage Actuators,''

IEEE Transactions on Magnetics, vol.42, no.2, Part 1, pp.247-254, 2006 (pdf-file)R.Nagamuneand A.Blomqvist,

``Sensitivity shaping with degree constraint by nonlinear least-square optimization,''

Automatica, vol.41, no.7, pp.1219-1227, 2005 (pdf-file)- A.Blomqvist and
R.Nagamune,

``Optimization-based computation of analytic interpolants of bounded complexity,''

Systems and Control Letters, vol.54, no.9, pp.855-864, 2005 (pdf-file)R.Nagamune,

``Closed-loop Shaping Based on Nevanlinna-Pick Interpolation with a Degree Bound,''

IEEE Transactions on Automatic Control, vol.49, no.2, pp.300-305, 2004 (pdf-file)R.Nagamune,

``A shaping limitation of rational sensitivity functions with a degree constraint,''

IEEE Transactions on Automatic Control, vol.49, no.2, pp.296-300, 2004 (pdf-file)- A.Blomqvist, A.Lindquist and
R.Nagamune,

``Matrix-valued Nevanlinna-Pick interpolation with complexity constraint: An optimizaiton approach,''

IEEE Transactions on Automatic Control, vol.48, no.12, pp.2172-2190, 2003 (pdf-file)R.Nagamune,

``A Robust Solver Using a Continuation Method for Nevanlinna-Pick Interpolation with Degree Constraint,''

IEEE Transactions on Automatic Control, vol.48, no.1, pp.113-117, 2003 (pdf-file)## Recently submitted and working papers

- E.Azadi Yazdi and
R.Nagamune,

``Multiple robust H-infinity controller design using the nonsmooth optimization method,'' submitted for publicationR.Nagamuneand J.Choi,

``Parameter reduction of estimated models for robust control,''

submitted for publicationR.Nagamune, X.Huang and R.Horowitz,

``Robust Control Synthesis Techniques for Multirate and Multi-sensing Track-following Servo Systems in HDDs,''

to appear in ASME Journal of Dynamic Systems, Measurement and Control## Book chapter

- R.Horowitz, T.L.Chen, K.Oldham , X.Huang,
R. Nagamuneand Y. Li, ``Microactuators for Dual-Stage Servo Systems in Magnetic Disk Files,'' a chapter in Springer Handbook of Nanotechnology, 2nd edition, edited by B.Bhushan, 2006 (pdf-file)R.Nagamuneand A.Lindquist,

``Sensitivity shaping in feedback control and analytic interpolation theory,''

in a book "Optimal Control and Partial Differential Equations" (In honour of Professor Alain Bensoussan's 60th Birthday), edited by J.L.Menaldi, E.Rofman and A.Sulem, IOS Press, Ohmsha, 2001, pp.404-413

(also Technical report TRITA/MAT-00-OS17 in KTH)## Refereed international conference papers

R.Nagamuneand J.Choi,

``Parameter reduction of nonlinear least-squares estimates via the singular value decomposition,''

in the Preprints of the 17th IFAC World Congress, Seoul, Korea, pp. 12383-12388.R.Nagamuneand J.Choi,

``Parameter reduction of nonlinear least-squares estimates via nonconvex optimization,''

in the Proceedings of the 2008 American Control Conference, Seattle, USA, pp. 1298-1303.- G. Fanizza, J. Karlsson, A. Lindquist, and
R.Nagamune,

``A Global Analysis Approach to Passivity Preserving Model Reduction,''

in the proceeding of the 44th IEEE Conference on Decision and Control (CDC06), 2006, pp.xxx-xxx- G. Fanizza and
R.Nagamune,

``Spectral Estimation by Numerical Optimization based on Rational Covariance Estimation,''

to appear in the proceedings of 17th International Symposium on Mathematical Theory of Networks and Systems (MTNS2006)- J.Choi,
R.Nagamuneand R.Horowitz,

``Multiple Robust Controller Design based on Parameter Dependent Lyapunov Functions,''

to appear in the proceedings of 17th International Symposium on Mathematical Theory of Networks and Systems (MTNS2006)R.Nagamune, X.Huang and R.Horowitz,

``Robust H2 Synthesis for Dual-stage Multi-sensing Track-following Servo Systems in HDDs,''

to appear in the proceedings of 2006 American Control Conference- X.Huang,
R.Nagamuneand R.Horowitz,

``A Comparison of Multirate Robust Track-following Control Synthesis Techniques for Dual-stage and Multi-sensing Servo Systems in Hard Disk Drives,''

to appear in the proceedings of 2006 American Control Conference- J.Choi,
R.Nagamuneand R.Horowitz,

``Synthesis of Multiple Robust Controllers for Parametric Uncertain LTI Systems,''

to appear in the proceedings of 2006 American Control ConferenceR.Nagamune, X.Huang and R.Horowitz

``Multirate track-following control with robust stability for a dual-stage multi-sensing servo system in HDDs,''

in the proceeding of the 44th IEEE Conference on Decision and Control (CDC05), 2005, pp. 3886-3891R.Nagamuneand A.Blomqvist

``Sensitivity shaping with degree constraint by nonlinear least-square optimization,''

in the proceeding of the 16th IFAC World Congress in Prague, Czech Republic, 2005- X.Huang,
R.Nagamune, R.Horowitz and Y.Li

``Track-following control with active vibration damping and compensation of Dual-stage servo system,''

in the proceeding of 2004 American Control Conference (ACC04)- A.Blomqvist, G.Fanizza and
R.Nagamune,

``Computation of bounded degree Nevanlinna-Pick interpolants by solving nonlinear equations,''

in the proceeding of the 42nd IEEE Conference on Decision and Control, pp. 4511-4516- A.Blomqvist and
R.Nagamune,

``An Extension of a Nevanlinna-Pick Interpolation Solver to Cases Including Derivative Constraints,''

in the proceeding of the 41st IEEE Conference on Decision and Control, pp. 2552-2557R.Nagamune,

``Simultaneous robust regulation and robust stabilization with degree constraint,''

in the proceeding (CD-ROM) of 15th International Symposium on Mathematical Theory of Networks and Systems (MTNS2002), University of Notre Dame, 2002R.Nagamune,

``A robust solver using a continuation method for Nevanlinna-Pick interpolation with degree constraint,'' in the proceeding of 40th Conference on Decision and Control (CDC01) in Orlando, Florida, pp. 1119-1124 (ps-file)R.Nagamune,

``Closed-loop Shaping by Analytic Functions with a Bounded Degree,'' in the proceeding of European Control Conference 2001 (ECC01) in Porto, Portugal, pp. 722-726 (ps-file)R.Nagamune,

``Sensitivity Reduction for SISO Systems Using the Nevanlinna-Pick Interpolation with Degree Constraint,''

in the proceedings of MTNS 2000, Perpignan, France (ps-file)- S.Yamamoto, M.Kimura, and
R.Nagamune,

``Identification of a state-space model set presuming robust performance control,''

6th International Conference on Control, Automation, Robotics and Vision, TA3.4-160 (Singapore) December 2000R.Nagamuneand S.Yamamoto,

``Model Set Validation and Update for Time-varying SISO Systems,''

in the preprint of 1998 American Control Conference in Philadelphia, USA, pp.2361--2365 (ps-file)R.Nagamune, S.Yamamoto and H.Kimura,

``Identification of the Smallest Unfalsified Model Set with both Parametric and Unstructured Uncertainty,''

in the preprint of the 11th IFAC Symposium on System Identification (SYSID '97) in Kitakyushu, Japan, vol.1, pp.75--80, 1997R.Nagamuneand H.Kimura,

``Model Set Identification Based on Euclidean Norm,''

in the preprint of the 13th IFAC World Congress in San Francisco, vol.I, pp.139--144, 1996 (refereed)## National journal papers

R.Nagamuneand J.Choi,

``Research activities at the University of British Columbia,''

Journal of the Institute of Control, Robotics and Systems, vol.13, no.3, pp.88-90, 2007 (Expository, In Korean)R.Nagamune,

``Robust control design based on analytic interpolation theory with degree constraint,''

Journal of the Institute of Systems, Control and Information Engineers, vol.48, no.8, pp.310-316, 2004 (Expository, In Japanese)- S.Yamamoto, M.Kimura and
R.Nagamune,

``Identification of a State-space Model Set Taking Stabilizing State Feedback into Consideration,''

SICE, vol.35, no.2, pp.213-220, 1999 (In Japanese)R.Nagamuneand S.Yamamoto,

``An Identification Method for a State Space Model Set with Time-Varying Parametric Uncertainties by using the Subspace Method,''

SICE, vol.35, no.6, pp.741-747, 1999 (In Japanese)- S.Yamamoto, M.Kimura and
R.Nagamune,

``Identification of a State-space Model Set presuming the Existence of Robust Performance Control,''

ISCIE, vol.12, no.7, pp.444-446, 1999 (In Japanese)R.Nagamune, S.Yamamoto and H.Kimura,

``Identification and Validation/Update for Smallest Model Sets of Transfer Functions with Parametric Uncertainties,''

SICE, vol.34, no.8, pp.992--997 (In Japanese)## National conference papers

- A.Blomqvist and
R.Nagamune,

``A new solver for degree constrained Nevanlinna-Pick interpolation including derivative constraints,''

in the proceeding of Reglermote (regulation meeting) 2002, Linkoping, Sweden, pp 25-30R.Nagamune,

``A New Approach to Shaping of the Sensitivity Function,''

in the proceeding of Reglermote (regulation meeting) 2000, Uppsala, Sweden, pp 67-72R.Nagamuneand S.Yamamoto,

``Model Validation and Update for Transfer Function Sets,''

in the proceedings of the 41st Annual Conference of the Institute of Systems, Control and Information Engineers (SCI'97) in Osaka, Japan, pp.7--8 1997 (In Japanese)- S.Yamamoto, M.Kimura and
R.Nagamune,

``An identification algorithm for a state-space model set taking into consideration stabilizing state feedback control''

in the preprints of the 26th SICE Symposium on Control theory in Chiba, Japan, pp.277--280, 1997 (In Japanese)R.Nagamuneand S.Yamamoto,

``Identification of a state space model set based on the subspace method,''

in the preprints of the 36th SICE Annual Conference (SICE'97) in Tokushima, Japan, pp.757-758, 1997 (In Japanese)R.Nagamuneand H.Kimura,

``Identification of the Smallest Model Set based on Euclidean Norm,''

in the preprints of the 24th SICE Symposium on Control theory in Kariya, Japan, pp.369--372, 1995 (In Japanese)## Technical reports

- G. Fanizza and
R.Nagamune,

``Spectral Estimation by Least-squares Optimization based on Rational Covariance Estimation,''

TRITA/MAT-06-OS-02, Royal Institute of Technology (pdf-file)- X.Huang,
R.Nagamuneand R.Horowitz,

``A Comparison of Multirate Robust Track-following Control Synthesis Techniques for Dual-stage and Multi-sensing Servo Systems in Hard Disk Drives,''

CML Reserach Report, Department of Mechanical Engineering, University of California at Berkeley, November 2005R.Nagamune, X.Huang and R.Horowitz

``Robust Control Synthesis Techniques for Multirate and Multi-sensing Track-following Servo Systems in HDDs,''

CML Reserach Report, Department of Mechanical Engineering, University of California at Berkeley, August 2005R.Nagamune, X.Huang and R.Horowitz

``Multirate track-following control with robust stability for a dual-stage multi-sensing servo system in HDDs,''

CML Reserach Report, Department of Mechanical Engineering, University of California at Berkeley, March 2005R.Nagamune, X.Huang and R.Horowitz

``Robust track-follwoing for dual-stage servo systems by sensitivity shaping with degree constraint,''

CML Reserach Report, Department of Mechanical Engineering, University of California at Berkeley, December 2004- A.Blomqvist, A.Lindquist and
R.Nagamune,

``Matrix-valued Nevanlinna-Pick interpolation with complexity constraint: An optimization approach,''

TRITA/MAT-02-OS13, Royal Institute of Technology (also in preprint series at Institut Mittag-Leffler (Djursholm, Sweden))- A.Blomqvist, G.Fanizza and
R.Nagamune,

``Computation of bounded Nevanlinna-Pick interpolants by solving nonlinear equations,''

in preprint series at Institut Mittag-Leffler (Djursholm, Sweden)- J.Malinen and
R.Nagamune,

``On the geometry of the Hermite-Fej{\'e}r interpolation problem through conservative realizations''

in preprint series at Institut Mittag-Leffler (Djursholm, Sweden)R.Nagamuneand A.Lindquist,

``Sensitivity shaping in feedback control and analytic interpolation theory,''

TRITA/MAT-00-OS17, Royal Institute of Technology- A.Blomqvist and
R.Nagamune,

``Optimization-based computation of analytic interpolants of bounded complexity,''

TRITA/MAT-04-OS03, Royal Institute of TechnologyR.Nagamuneand A.Blomqvist,

``Sensitivity shaping with degree constraint by nonlinear least-squares optimization,''

TRITA/MAT-04-OS02, Royal Institute of Technology## Course material

- P.Ogren,
R.Nagamuneand U.Jonsson,

Exercise Note on Optimal Control Theory,

Division of Optimization and Systems Theory, Royal Institute of Technology, 2003R.Nagamuneand X.Hu,

Exercise Note on Geometric Systems Theory,

Division of Optimization and Systems Theory, Royal Institute of Technology, 2002## Theses

- Doctoral thesis (2002): Royal Institute of Technology, Sweden

``Robust Control with Complexity Constraint: A Nevanlinna-Pick Interpolation Approach''(Abstract)

(advisor: Prof. Anders Lindquist )- Master thesis (1997): Osaka University, Japan

``The Smallest Model Set: A Parameter Bounding Approach to System Identification''

(advisor: Dr. Shigeru Yamamoto )- Bachelor thesis (1995): Osaka University, Japan

``Identification of the Uncertainty in the System'' (in Japanese)

(advisor: Prof. Hidenori Kimura )