Search Results - (Author, Cooperation:T. Tanino)

2016-04-19

Nature Publishing Group (NPG)

0028-0836

1476-4687

Biology

Chemistry and Pharmacology

Medicine

Natural Sciences in General

Physics

1420-9071

Springer Online Journal Archives 1860-2000

Biology

Medicine

Zusammenfassung Es wurden an den grossen Antennen des marinen Hummers,Panulirus japonicus, die afferenten Antworten auf Änderungen in der osmotischen Konzentration von verschiedenen elektrolytischen und nichtelektrolytischen Lösungen untersucht. Die Borstenorgane der Antennen scheinen Änderungen des osmotischen Druckes der Badeflüssigkeit wahrzunehmen.

Electronic Resource

1435-702X

Springer Online Journal Archives 1860-2000

Medicine

Abstract In order to determine whether pattern-reversal visual evoked response (VER) can be used to measure contrast sensitivity function (CSF), we investigated the effect of change of contrast upon pattern-reversal VER. Contrast thresholds for VER were extrapolated in five spatial frequencies. The CSF curve obtained from the VER showed the inverted U-shape as the psychophysical CSF curve. However, the low frequency fall-off that is usually seen in psychophysical CSF was less evident in the electrophysiological CSF. The difference between the electrophysiological CSF and the psychophysical CSF increased along with the spatial frequency. Proper stimulus conditions would make this method of evaluation of CSF by pattern reversal VER useful in relatively young children in whom psychophysical tests cannot be performed.

Electronic Resource

1573-2878

Point-to-set maps ; domination structures ; parameterized decision-making problems ; solution maps ; stability

Springer Online Journal Archives 1860-2000

Mathematics

Abstract Decision-making problems with multiple noncommensurable objectives are specified by two factors, i.e., the set of all feasible solutions and the domination structure. The solutions are characterized as nondominated points. Hence, in these problems, there may exist two parameter vectors, according to which the above two factors change. The stability of the solution set for perturbations of these parameters is investigated in this paper. The analysis is guided by using the concept of continuity of the solution map defined on the two parameter spaces.

Electronic Resource

1573-2878

Efficient points ; conjugate maps ; subgradients ; vector minimization problems ; perturbed problems ; dual problems ; Lagrangian maps ; saddle points

Springer Online Journal Archives 1860-2000

Mathematics

Abstract This paper considers duality in convex vector optimization. A vector optimization problem requires one to find all the efficient points of the attainable value set for given multiple objective functions. Embedding the primal problem into a family of perturbed problems enables one to define a dual problem in terms of the conjugate map of the perturbed objective function. Every solution of the stable primal problem is associated with a certain solution of the dual problem, which is characterized as a subgradient of the perturbed efficient value map. This pair of solutions also provides a saddle point of the Lagrangian map.

Electronic Resource

1573-2878

global optimization ; reverse convex programming problem ; dual problem ; inner approximation method ; penalty function method

Springer Online Journal Archives 1860-2000

Mathematics

Abstract In this paper, we consider a reverse convex programming problem constrained by a convex set and a reverse convex set, which is defined by the complement of the interior of a compact convex set X. We propose an inner approximation method to solve the problem in the case where X is not necessarily a polytope. The algorithm utilizes an inner approximation of X by a sequence of polytopes to generate relaxed problems. It is shown that every accumulation point of the sequence of optimal solutions of the relaxed problems is an optimal solution of the original problem.

Electronic Resource

1573-2878

Sensitivity analysis ; multiobjective optimization ; perturbation maps ; contingent derivatives

Springer Online Journal Archives 1860-2000

Mathematics

Abstract Sensitivity analysis in multiobjective optimization is dealt with in this paper. Given a family of parametrized multiobjective optimization problems, the perturbation map is defined as the set-valued map which associates to each parameter value the set of minimal points of the perturbed feasible set in the objective space with respect to a fixed ordering convex cone. The behavior of the perturbation map is analyzed quantitatively by using the concept of contingent derivatives for set-valued maps. Particularly, it is shown that the sensitivity is closely related to the Lagrange multipliers in multiobjective programming.

Electronic Resource

1573-2878

Domination structures ; cone extreme points ; primal map ; vector-valued Lagrangian function ; dual map

Springer Online Journal Archives 1860-2000

Mathematics

Abstract In this paper, a multiobjective programming problem is considered as that of finding the set of all nondominated solutions with respect to the given domination cone. Two point-to-set maps, the primal map and the dual map, and the vector-valued Lagrangian function are defined, corresponding to the case of a scalar optimization problem. The Lagrange multiplier theorem, the saddle-point theorem, and the duality theorem are derived by using the properties of these maps under adequate convexity assumptions and regularity conditions.

Electronic Resource

1573-2878

Vector optimization ; perturbation maps ; contingent derivative ; TP-derivative ; Dini derivative

Springer Online Journal Archives 1860-2000

Mathematics

Abstract For a vector optimization problem that depends on a parameter vector, the sensitivity analysis of perturbation, proper perturbation, and weak perturbation maps is dealth with. Each of the perturbation maps is defined as a set-valued map which associates to each parameter value the set of all minimal, properly minimal, and weakly minimal points of the perturbed feasible set in the objective space with respect to a fixed ordering cone. Using contingent cones in a finite-dimensional Euclidean space, we investigate the relationship between the contingent derivatives of the three types of perturbation maps and three types of minimal point sets for the contingent derivative of the feasible-set map in the objective space. These results provide quantitative informations on the behavior of the perturbation maps.

Electronic Resource

1741-0444

Alternating current stimulation ; Diagnosis of eye diseases ; Electrically evoked response (e.e.r.) ; Electroretinogram (e.r.g.) ; Optimum stimulus frequency ; Pigmentary retinal dystrophy (retinal disease) ; Retinal dystrophy

Springer Online Journal Archives 1860-2000

Biology

Chemistry and Pharmacology

Medicine

Abstract Alternating current stimulation of the eye generates an occipital electrically evoked response (a.c.-e.e.r.) of which the frequency characteristic shows a monophasic pattern for which the optimum stimulus frequency for evoking a maximum response is 18 Hz. A.C.-E.E.R. is a very useful tool for making a diagnosis of pigmentary retinal dystrophy and is different from the e.r.g. in that it is not affected by diseases of the optical system such as strong refractive anomalies or vitreous opacities.

Electronic Resource