Kohshi OKUMURA


An Algebraic Approach to Guarantee Harmonic Balance Method Using Grobner Base
Masakazu YAGI Takashi HISAKADO Kohshi OKUMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/09/01
Vol. E91-A  No. 9  pp. 2442-2449
Type of Manuscript:  Special Section PAPER (Special Section on Nonlinear Theory and its Applications)
Category: Analysis, Modelng and Simulation
Keyword: 
harmonic balance methoderror boundGrobner basealgebraic representationquadratic approximationsingular point
 Summary | Full Text:PDF

Nonexistence of Symmetric Modes of Subharmonic Oscillations in Three-Phase Circuit--An Approach by Interval Computation
Takashi HISAKADO Kohshi OKUMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/12/01
Vol. E84-A  No. 12  pp. 3108-3115
Type of Manuscript:  PAPER
Category: Circuit Theory
Keyword: 
symmetrythree-phase circuitsubharmonic oscillationinterval computationall solutions
 Summary | Full Text:PDF

Bifurcation Phenomena of 1/2-Subharmonic Oscillations in Three-Phase Circuit
Takashi HISAKADO Kohshi OKUMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/09/25
Vol. E82-A  No. 9  pp. 1919-1925
Type of Manuscript:  PAPER
Category: Nonlinear Problems
Keyword: 
nonlinear symmetric three-phase circuit1/2-subharmonic oscillationbifurcationhomotopy method
 Summary | Full Text:PDF

Bifurcation Phenomena of Harmonic Oscillations in Three-Phase Circuit
Takashi HISAKADO Kohshi OKUMURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1997/06/25
Vol. E80-A  No. 6  pp. 1127-1134
Type of Manuscript:  PAPER
Category: Nonlinear Problems
Keyword: 
nonlinear symmetric three-phase circuitharmonic oscillationbifurcationhomotopy method
 Summary | Full Text:PDF