| 1. |
- Berbyuk, Viktor, 1953
(författare)
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Dynamics and optimal control of biotechnical systems "Man-Prosthesis"
- 1997
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Ingår i: IUTAM Symposium on Interaction Between Dynamics and Control in Advanced Mechanical Systems, Ed. D. van Campen, Kluwer Academic Publishers, 1997. - Dordrecht : Springer Netherlands. ; , s. 35-42
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Konferensbidrag (refereegranskat)abstract
- In the paper, a mathematical model is proposed for investigating the controlled motion of human locomotion system (HLS) with an above-knee prosthesis. To provide insight into the interaction between dynamics and control in biotechnical system Man-Prosthesis the energy optimal control problem of the HLS wearing a lower limb prosthesis has been considered. The algorithm is based on special conversion of the optimal control problem for a nonlinear dynamical system which models HLS into a standard nonlinear programming problem. A number of energy-optimal control problems of human locomotion with an artificial leg, and optimization problems for the constructive parameters of the prostheses under different boundary conditions and constraints have been solved. The numerical results obtained were compared with experimental data for normal human locomotion. The energy-optimal elastic and viscoelastic characteristics of the ankle and knee joints of the prostheses have been determined.
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| 2. |
- Berbyuk, Viktor, 1953
(författare)
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The use of first integrals to synthesize the energetically optimal control of a nonlinear system
- 1997
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Ingår i: Journal of Mathematical Sciences. - 1573-8795 .- 1072-3374. ; 86:2, s. 2642-2645
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Tidskriftsartikel (refereegranskat)abstract
- In the paper a method of solving problems of optimal control of the motion of nonlinear dynamical systemswith respect to energy expenditure given a fixed time and fixed ends of the phase trajectory has been proposed. The method is based on the use of first integrals of the equations of free motion. The application of the method isillustrated by examples.
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| 3. |
- Dodunekova, Rossitza, 1948, et al.
(författare)
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Almost-MDS and near-MDS codes for error detection
- 1997
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Ingår i: IEEE Transactions in Information Theory. ; 43:1, s. 285-290
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Tidskriftsartikel (refereegranskat)abstract
- The error detection capability of AMDS and NMDS codes is studied. Necessary and sufficient conditions for the codes to be proper or good for error detection are given.
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| 4. |
- Dodunekova, Rossitza, 1948
(författare)
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Intermediate St. Petersburg sums
- 1996
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Ingår i: Studia Sci. mathe. Hungar.. ; 31:1-3, s. 93-119
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Tidskriftsartikel (refereegranskat)
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| 5. |
- Dodunekova, Rossitza, 1948, et al.
(författare)
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Sufficient conditions for good and proper error detecting codes
- 1997
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Ingår i: IEEE Transactions in Information Theory. ; 43:6, s. 2023-2026
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Tidskriftsartikel (refereegranskat)abstract
- The performance of linear block codes over a finite field is investigated when they are used for pure error detection. Sufficient conditions for a code to be good or proper for error detection are derived.
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| 6. |
- Dodunekova, Rossitza, 1948, et al.
(författare)
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Sufficient conditions for good and proper error detecting codes via their duals
- 1997
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Ingår i: Math. Balkanica (N.S.). ; 11:3-4, s. 357-381
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Tidskriftsartikel (refereegranskat)abstract
- We have found earlier in [1] sufficient conditions for a linear block code to be good or proper for error detection. These conditions are expressed in terms of the weight distribution of the code. However, for codes with small co-dimension or with small number of nonzero weights in their dual codes the conditions would be technically easier to check if they were presented in terms of the dual weight distribution. This alternative representation is the purpose of the present paper.
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