Showing papers by "Osaka University published in 1971"
TL;DR: In this paper explicit formulas for the weight enumerators for several classes of subcodes of the 2nd-order binary Reed-Muller codes are derived and a large set of codes are shown to have the same weight enumerator.
Abstract: In this paper explicit formulas for the weight enumerators for several classes of subcodes of the 2nd-order binary Reed-Muller codes are derived. A large set of the codes are shown to have the same weight enumerators. The classes of codes studied in this paper contain the (0, 2)th-order Euclidean Geometry codes and the codes studied by Berlekamp as subclasses.
375 citations
TL;DR: In this paper, the crystal structure and internal defects of equiatomic TiNi martensites have been studied using the techniques of electron microscopy, electron diffraction, and X-ray diffraction.
Abstract: The crystal structure and internal defects of equiatomic TiNi martensites have been studied using the techniques of electron microscopy, electron diffraction, and X-ray diffraction The crystal structure may be described as of distorted B19 type with a monoclinic unit cell, the lattice parameters of which are a = 2889 A, b = 4120 A, c = 4622 A, and β = 968° The structure is derived from the matrix B2 in two steps Namely, the matrix B2 transforms into a B19 first, and then a monoclinic martensite is derived by shearing the B19 in [100]B19 direction on (001)B19 plane As an internal defect of the martensite, transformation twins with (111) twinning plane have been found without ambiguity, whose presence is essential for the understanding of the unique memory effect in this alloy The orientation relationship between the matrix and martensite, and some characteristics of a pre-martensitic transition are also described
366 citations
366 citations
TL;DR: In this paper, the authors give a formalism to calculate from the first principle the electronic structure of substitutionally disordered alloys in the coherent potential approximation (CPA), based on the t-matrix of the muffin-tin potential and extend the KKR method of the energy band calculation to concentrated alloys.
Abstract: In order to give a formalism to calculate from the first principle the electronic structure of substitutionally disordered alloys in the coherent potential approximation (CPA), we re formulate the CPA based on the t-matrix of the muffin-tin potential and extend the KKR method of the energy band calculation to concentrated alloys by introducing the concept of the coherent t-matrix. In close connection with this, a formulation is given to calculate, with the use of the locator and coherent locator, the local and total densities of states of al loys based on the tight-binding model. In this model the transfer integral as well as the atomic level depends on the atomic species on sites, and the transfer integral between A and
345 citations
01 Jan 1971
TL;DR: A method of classifying patterns using fuzzy relations is described, where a similitude between any two patterns is calculated by using the composition of a fuzzy relation to induce an equivalence relation.
Abstract: A method of classifying patterns using fuzzy relations is described. To start with, we give a suitable value of the measure of subjective similarity to each pair of patterns that is taken from the population of patterns to be classified. Then a similitude between any two patterns is calculated by using the composition of a fuzzy relation. The similitude induces an equivalence relation. Consequently, we can classify the present population of the patterns into some classes by the equivalence relation. An experiment of the classification of portraits has been performed to test the method proposed here.
269 citations
TL;DR: In this paper, an application of the coherent potential approximation (CPA) to ferromagnetic alloys is discussed on the basis of a non-degenerate tight-binding model and the intraatomic coulomb interaction is taken into account selfconsistently within the framework of the Hartree-Fock approximation.
Abstract: An application of the coherent potential approximation (CPA) to ferromagnetic alloys is discussed on the basis of a nondegenerate tight-binding model. The intraatomic coulomb interaction is taken into account self-consistently within the framework of the Hartree-Fock approximation. Numerical calculations are carried out for the case of Ni 1- x Fe x . The results are in good agreement with the experimental data of the magnetic moments of Ni and Fe in concentrated alloys and also with the data of the electronic specific heat. The instability of the nonmagnetic state at a finite temperature is discussed by calculating the susceptibility in CPA. Possible experiments to check the calculated electronic structure are discussed. An extention to a degenerate (multiband) tight-binding model is also presented.
208 citations
TL;DR: A new definition of generalized information measures is introduced so as to investigate the finite-parameter estimation problem and yields a class of generalized entropy functions which are useful for treating the error-probability of decision and the other equivocation measures in the same framework.
Abstract: A new definition of generalized information measures is introduced so as to investigate the finite-parameter estimation problem. This definition yields a class of generalized entropy functions which is useful for treating the error-probability of decision and the other equivocation measures such as Shannon's logarithmic measure in the same framework and, in particular, deriving upper bounds to the error-probability. A few of inequalities between these equivocation measures are presented including an extension of Fano's inequality.
201 citations
TL;DR: The theoretical interpretation of the shearing interferometer based on the moiré method using the fourier image of the grating is described and applications to measurement of the phase gradient and lens aberration are shown.
Abstract: The theoretical interpretation of the shearing interferometer based on the moire method using the fourier image of the grating is described. To obtain a pattern with good contrast, the observing plane must coincide with the normal fourier image plane of the grating or with the reversed fourier image plane. The information obtained by this method is the first partial derivative and under certain conditions the second partial derivative of the distortion from the reference wavefront, which is planar or spherical. Applications to measurement of the phase gradient and lens aberration are shown.
162 citations
TL;DR: An alternate derivation of the dual condition (called the severance-value condition in this article ) to feasibility of the multicommodity flow problem is given by graph theoretical arguments.
Abstract: An alternate derivation of the dual condition (called the severance-value condition in this paper) to feasibility of the multicommodity flow problem is given by graph theoretical arguments That is, a multicommodity flow of given requirements is feasible if and only if the capacity of every severance is no less than its least capacity consumption for the flow A severance is a set of the edges with nonnegative integer coefficients Even when the severance-value condition is satisfied by a certain finite subset of severances, the multicommodity flow is shown to be still feasible if each requirement is allowed to be reduced by an appropriate amount \mu This truncation allowance \mu is estimated in terms of the network topology and the capacity function
138 citations
TL;DR: The atomic model of oxyhaemoglobin showed that the haemoglobin molecule is insensitive to replacements of most amino-acid residues on its surface but extremely sensitive to quite small alterations of internal non-polar contacts.
Abstract: WHEN the atomic model of oxyhaemoglobin had just been completed, we showed that the haemoglobin molecule is insensitive to replacements of most amino-acid residues on its surface but extremely sensitive to quite small alterations of internal non-polar contacts. And replacements near the haems and at the contacts between α and β subunits affect the respiratory function1.
127 citations
TL;DR: Results indicate that vagal stimulation results in activation of glycogen synthetase, whereas splanchnic-nerve stimulation causes inactivation of the enzyme, which is closely correlated with the time course of decrease in the UDPG and Glc-6- P levels in the liver.
TL;DR: In this article, it was proposed that asymmetric syntheses be divided into enanti-and diastereoselective syntheses, based on the relationship between the enantioselectivity of the catalyst and the structure of the chiral compound used to modify it.
Abstract: It is proposed that asymmetric syntheses be divided into enantioselective and diastereoselective syntheses. The enantioselective hydrogenations discussed in the present progress report were catalyzed by Raney nickel that had previously been treated with solutions of optically active compounds. Relationships exist between the enantioselectivity of the catalyst and the structure of the chiral compound used to modify it.
TL;DR: In this article, a phase diagram for the FeS-Fe7S8 system was presented below 320°C based on the x-ray single crystal studies of synthetic pyrrhotite at various temperatures.
TL;DR: This paper describes a method of determining the directions of the principal axes of the g-tensors in single crystals from measurements of theg-value variation in three crystalline planes (ab, bc*, ac) and of the Principal values of g-Tensors.
TL;DR: The structure of this basic amino acid was determined to be N 6 -4-amino-2-hydroxybutyl)-2,6-diaminohexanoic acid on the basis of its physical properties involving NMR and mass spectra, as well as chemical degradation including periodate oxidation and reduction with HI and P.
TL;DR: 2,3-Diphosphoglycerate markedly reduces the affinity of Hb A to the 1st, 2nd, and 3rd molecules of oxygen without affecting the affinity to the 4th molecule, which is similar to the oxygen affinity of the isolated β chains.
TL;DR: Two sisters with nongoitrous cretinism, offspring of a consanguineous marriage, were found to have isolated thyrotropin (TSH) deficiency and growth hormone, ACTH and gonadotropin secretion were studied.
Abstract: Two sisters with nongoitrous cretinism, offspring of a consanguineous marriage, were found to have isolated thyrotropin (TSH) deficiency. Growth hormone, ACTH and gonadotropin secretion we...
TL;DR: In this article, the extinction coefficients of the characteristic infrared bands due to isomeric structural units were measured for polybutadiene and polyisoprene in CS2 or CCl4 solutions and were compared with the isomer composition determined by NMR.
Abstract: Extinction coefficients of the characteristic infrared bands due to isomeric structural units were measured for polybutadiene and polyisoprene in CS2 or CCl4 solutions and were compared with the isomer composition determined by NMR. The NMR signal assignments were made on the basis of the spectra of deutero derivatives of the polymers. In the case of polyisoprene, linear relations were obtained between the extinction coefficients and the isomer contents determined by NMR for the absorption bands at 1385 cm−1 (characteristic of trans-1,4 units), 1376 cm−1 (cis-1,4 units), and 889 cm−1 (3,4 units). However, for the absorption bands at 840 cm−1 (characteristic of cis-1,4 and trans-1,4 units), isomerized polyisoprenes did not give such a linear relationship. In polybutadiene, the extinction coefficient for the atactic 1,2 units was found to be lower than that of the syndiotactic 1,2 unit. These experimental facts lead to the conclusion that additivity of the extinction coefficients does not always hold for diene polymers. The deviation from the linear relation may be associated with regular sequences of one isomeric conformation in the chain.
TL;DR: The results suggest that a pull mechanism is involved in the acceleration of liver-glycogen synthesis on vagal stimulation, and that the conversion of UDPG to glycogen is the step which is stimulated.
TL;DR: Two phospholipase A's found in the venom of Agkistrodon halys blomhoffii were purified by successive chromatographies on ion exchangers and gel filtration on Sephadex G-100, revealing conformational differences between the side-chain chromophores of the two proteins.
TL;DR: In this paper, the basic mechanism in the rapid decrease of the saturation magnetization of Ni-base dilute alloys with increasing concentration of non-transition elements is elucidated by carrying out an ab initio calculation with the use of the pseudo-Greenian method which was developed previously for the general use in the calculation of metals and alloys.
Abstract: (Received April 6, 1971) The basic mechanism in the rapid decrease of the saturation magnetization of Ni-base dilute alloys with increasing concentration of non-transition elements is elucidated by carrying out an ab initio calculation with the use of the pseudo-Greenian method which was developed previously for the general use in the calculation of electronic structure of metals and alloys. It is the essential point of the mechanism that the number of s and p symmetry states be low the Fermi level does not change very much even in the presence of a deep impurity potential because of the interference between the d band and the OPW state of host Ni. A useful expression of the Greenian of pure Ni which is needed in the calculation is derived also by use of the pseudo-Greenian method.
TL;DR: Reticular influence upon unitary and mass activities of the lateral geniculate body (LGB) was studied in urethane-anesthetized rats and the possibility that the reticular facilitation of the P cell activity may be due to inhibition of I cells (dis-inhibition) was discussed.
TL;DR: In this paper, the primary structure of α-bungarotoxin isolated from the venom of Bungarus multicinctus was determined, which composes of 74 amino acid residues including ten half-cystines.
TL;DR: N G -Monomethylarginine was isolated from the hydrolysate of a protein fraction of bovine brain and its concentrations were determined in the protein fractions of various organs and subcellular components of brain and liver of rats.
TL;DR: In this paper, it was shown that l -lysine is converted to saccharopine in the presence of α-ketoglutarate and NADPH, and to α-aminoadipic-δ-semialdehyde (Δ 1 -piperideine-6-carboxylate), the proposed reaction product of saccharipine cleavage, is effected by either NAD + or NADP +.
TL;DR: Spectrophotometric titration of cobrotoxin showed that one of the two tyrosyl groups was titrated freely with a normal apparent p K of 9.65, and the remaining one ionized with time only after irreversible conformational change had occurred at pH above 11.3.
TL;DR: In this paper, the trajectory of charged particles in the fringing field of a toroidal condenser (including a cylindrical condenser) is calculated and all ion optical effects of fringing fields including the effect of the curved field boundary are described in the transfer matrix representation.