Showing papers by "Korea University published in 1985"
TL;DR: Examination and comparison of eight representative isolates from endemic disease areas and from regions with no known associated HFRS indicate that these viruses represent a new and unique group that constitutes a separate genus in the Bunyaviridae family of animal viruses.
Abstract: Hemorrhagic fever with renal syndrome (HFRS) comprises a variety of clinically similar diseases of viral etiology that are endemic to and sporadically epidemic throughout the Eurasian continent and Japan. Although HFRS has not been reported in North America, viruses that are antigenically similar to HFRS agents were recently isolated from rodents in the United States. Examination and comparison of eight representative isolates from endemic disease areas and from regions with no known associated HFRS indicate that these viruses represent a new and unique group that constitutes a separate genus in the Bunyaviridae family of animal viruses.
392 citations
01 Jan 1985
TL;DR: Abernathy and Utterback as discussed by the authors argue that product innovation, process innovation, and organizational structure and processes become inextricably linked as an organization and its line of business evolve.
Abstract: How does technological change occur in an organizational, market and manufacturing context? How does innovation in products and processses affect a firm’s competitive viability? Do patterns of innovation occur from firm to firm or within one firm over time? If so, what are the implications for research on organizations and for management? Recent work on innovation in industry contends that product innovation, process innovation, and organizational structure and processes become inextricably linked as an organization and its line of business evolve. The changing relationship among them stimulates certain directions of further change while it constrains others or makes them less and less attractive (Abernathy, 1978; Abernathy and Utterback, 1978). In brief, incremental innovations albeit with great commercial rewards, become more and more attractive, while more radical departures, the subject of this chapter, become diminishingly attractive to established, dominant competitors.
71 citations
40 citations
TL;DR: During 8 april 1983 to 9 April 1985, a total of 181 domestic cats of unknown localities in Korea were purchased at Seoul Chung-ang market, and the internal organs were dissected for helminth infections.
Abstract: During 8 april 1983 to 9 April 1985, a total of 181 domestic cats (Felis catus domestica Linnaeus) of unknown localities in Korea were purchased at Seoul Chung-ang market, and the internal organs were dissected for helminth infections. In the results, three kinds of trematodes of family Heterophyidae (Ohdner, 1914) were obtained from small intesine of domestic cats and identified as follows: five adult worms of Heterophyopsis continua (Onji et Nishio, 1916) from three hosts, two hundreds and twenty three adult worms of Pygidiopsis summa Onji et Nishio, 1916 from seven hosts and twenty six adult worms of Heterophyes heterophyes nocens (Onji et Nishio, 1916) from three hosts. Among them, Heterophyopsis continua and Pygidiopsis summa had not been proved as natural infectios of cats in Korea.
23 citations
TL;DR: In this paper, three series of thermotropic, main chain polyesters and copolyesters which formed cholesteric mesophases were prepared and characterized, which contained triad aromatic ester mesogenic units and chiral polyalkylene spacers.
12 citations
TL;DR: In this article, the structure partiellement et pleinement cristallisee des alliages amorphes is described, i.e., 1−x Ti x avec 0,35≤x≤0,65, par chauffage continu jusqu'a une temperature determinee de la courbe de calorimetrie differentielle a balayage.
10 citations
TL;DR: In this paper, a partir des N-chlorobenzyl methyl amines, a reaction with CH 3 ONa-CH 3 OH produces benzylidenemethylamines and benzylmethylamine.
Abstract: L'elimination a partir des N-chlorobenzyl methyl amines est quantitative, conduisant seulement aux benzylidenemethylamines. La reaction des N-bromomethylbenzylamines avec CH 3 ONa-CH 3 OH produit des benzylidenemethylamines et des benzylmethylamines. Effet des substituants
8 citations
TL;DR: In this article, a fast neutron spectrometer by recoil proton detection method was developed, consisting of a radiator and an integrated dE-E Si detector, in which an epitaxial dE counter of less than 10?m and an E counter are incorporated.
Abstract: A fast neutron spectrometer by recoil proton detection method was developed. The spectrometer is consisted of a radiator and an integrated dE-E Si detector, in which an epitaxial dE counter of less than 10 ?m and an E counter are incorporated. Recoil protons from the radiator can easily be identified from ? ray background; and besides each recoil proton angle can be determined by the dE and E counter outputs. and thus an unfolded neutron spectrum can be attained. Neutron detection efficiency is high, compared with conventional dE-E telescope spectrometers, owing to the wide solid angle coverage of recoil protons. The basic characterestics and measured neutron spectra are described.
8 citations
TL;DR: It was shown, by using an in vitro protein synthesizing system from a puromycin-susceptible organism S. flavotricini subsp.
Abstract: Puromycin 2"-N-acetyltransferase was isolated from cell extracts of puromycin-producing Streptomyces alboniger KCC S-0309 by ammonium sulfate fractionation, heat treatment to eliminate contaminant proteins and chromatography on DEAE-Toyopearl 650S. After PAGE (polyacrylamide gel electrophoresis) of the final fraction, a single protein band corresponding to puromycin 2"-N-acetyltransferase was detected. The molecular weight of the enzyme determined by SDS-PAGE and Sephadex G-150 chromatography was about 21,000 and 85,000, respectively, suggesting that the enzyme consisted of four subunits. The isoelectric point and the optimum pH for reaction were 6.2 and 7.7, respectively. The Km values for puromycin and acetyl coenzyme A were 40 microM and 67 microM, respectively. The enzyme was thermostable up to 70 degrees C for 12 minutes. It was shown, by using an in vitro protein synthesizing system from a puromycin-susceptible organism S. flavotricini subsp. pseudochromogenes V-13-1, that the isolated puromycin 2"-N-acetyltransferase could protect polyphenylalanine synthesis from inhibition by puromycin.
8 citations
TL;DR: The hydrothermal vein-type deposits which comprise the Sambong, Samsan, and Seongji mines are primarily copper deposits, but they have associated lead, zinc, and silver mineralization.
Abstract: The hydrothermal vein-type deposits which comprise the Sambong, Samsan, and Seongji mines are primarily copper deposits, but they have associated lead, zinc, and silver mineralization The deposits occur within Upper Cretaceous volcanic rocks of the Gyeongsang basin of the southern Korean peninsula Mineralization can be separated into three distinct stages (I, II, and III) which fill preexisting fault breccia zones Each stage is terminated by an onset of fracturing and brecciation events Fluid inclusion data suggest that stages I and II each evolved from initial high temperatures (near 350 degrees C) to later lower temperatures (near 200 degrees C) Each stage represents a separate mineralizing system which cooled and largely abated prior to the onset of the next stage Fluid inclusion data from stage III, a postore, carbonate stage of mineralization, indicate a much cooler (190 degrees -120 degrees C), more dilute hydrothermal system which was probably the result of increasing influx of meteoric watersSulfur isotope and fluid inclusion evidence suggests that ore minerals were deposited at temperatures between 350 degrees and 250 degrees C from fluids with salinities ranging from 3 to 17 equivalent weight percent NaCl Fluid inclusion evidence of boiling suggests pressures of less than 100 bars during portions of stage I and II mineralization This pressure corresponds to depths at the time of mineralization between 500 and 1,250 mSulfur isotope compositions of sulfide minerals are consistent with an igneous source of sulfur with a delta 34 S (sub Sigma S) value near 40 per mil Carbon and oxygen isotope compositions of carbonate-stage calcites suggest that meteoric water dominated the hydrothermal system at temperatures below 200 degrees CThe similarity of the features of the Sambong, Samsan, and Seongji mines to those of other copper-bearing hydrothermal deposits in Korea and elsewhere suggests a genetic tie between granitic magmatism and the development of the observed Cu-Pb-Zn-Ag mineralization and parageneses
7 citations
TL;DR: In this paper, the depth profiles of the chemical states and the compositions of Pd and Si near the surface region of amorphous Pd80Si20 alloys have been studied by XPS.
Abstract: The depth profiles of the chemical states and the compositions of Pd and Si near the surface region of amorphous Pd80Si20 alloys have been studied by XPS. It is found that analysis of the peak positions, the peak shapes, and the integrated intensities of XPS core-lines are very useful. The depth profile can be divided into three characteristic regions: bulk, transient, and skin. On passing through the transient region from the bulk to the skin, abundance of SiO2 increases while that of Pd decreases. In the skin region, amorphous SiO coexists with metallic Pd. To explain these experimental findings, a tentative model is proposed assuming an increase of the molar volume of Si on oxidation.
TL;DR: In this paper, the coarsening rates of the Β precipitates in an Al-11 wt pct Mg alloy at 250, 316, and 330 ˚C aging temperatures were investigated.
Abstract: The coarsening rates of the Β precipitates in an Al-11 wt pct Mg alloy at 250 ‡C, 316 ‡C, and 330 ‡C aging temperatures were investigated. As predicted by the modified Lifshitz-Slyozov-Wagner (MLSW) theory of diffusion controlled particle coarsening, a linear dependence ofr3 ont in the long time aging region was observed. Interfacial energies of 8.1, 1.8, and 1.7 J/m2 for 250 ‡C, 316 ‡C, and 330 ‡C, respectively, were computed from these data using the MLSW theory. The high values of interfacial energy indicate that the Β precipitates are incoherent with respect to the Al matrix. The especially high value of interfacial energy and low activation energy for the precipitate coarsening at 250 ‡C suggest that significant short circuit diffusion occurs at this aging temperature.
TL;DR: In this paper, the ν3 + amide II band of thioacetamide was recorded in carbon tetrachloride solutions and in very dilute solutions of thiosacetamide + dimethylformamide over the range 5 −55°C.
TL;DR: In this paper, the mixing mechanism of solid particles in the air spouted bed was studied by employing an impulse response technique, and the particles, german millet and barley, were spouted by air in columns of diameter of 8.4 cm and 12.6 cm.
Abstract: The mixing mechanism of solid particles in the air spouted bed was studied by employing an impulse response technique. The particles, german millet and barley, were spouted by air in columns of diameter of 8.4 cm and 12.6 cm.
TL;DR: In this article, surface barrier silicon detectors with a large active area have been produced by using high resistive n-type silicon crystals, diameters of which are 3 to 5 inches.
Abstract: Surface barrier silicon detectors with a large active area have been produced by using high resistive n-type silicon crystals, diameters of which are 3 to 5 inches. High quality detectors with a low leakage current and a low noise were achieved by developing the improved surface treatment. Characteristics of detectors obtained are good in energy resolution compared with conventional large area Si(Li) detectors. It has also been confirmed that local dead region is not found from measuring results of photo-pulse injection.
01 Jan 1985
TL;DR: A series of polyesters containing monosubstituted p-phenylene bis-terephthalate mesogenic groups and decamethylene flexible spacers was prepared and characterized for the effect of substituent polarity and size on the transition temperatures and on the thermal stability and type of liquid crystalline phase formed.
Abstract: A series of polyesters containing monosubstituted p-phenylene bis-terephthalate mesogenic groups and decamethylene flexible spacers was prepared and characterized for the effect of substituent polarity and size on the transition temperatures and on the thermal stability and type of liquid crystalline phase formed. No simple correlation between the polar effects of the lateral substituents and the thermal stabilities of the polymer mesophases was observed. The polar effects of the substituents appeared to be less important than their steric effects in controlling the thermotropic transitions of these polymers and of essentially no importance in controlling their glass temperatures and melting points. Optical textures of the polymer melts did not provide clear conclusions as to the nature of the liquid crystalline phases formed by these polymers, but their textures resembled those of low molecular weight nematics.
TL;DR: Amorphous Cu100-xTix alloys were prepared by means of roller quenching in the range of 35≤×≤65. Differential scanning calorimetry was used to study the crystallization process.
Abstract: Amorphous Cu100-xTix alloys were prepared by means of roller quenching in the range of 35≤×≤65. Differential scanning calorimetry was used to study the crystallization process. Crystallization temperatures of the amorphous Cu100-xTix alloys were found to occur around 700 K and to show a little variation with concentration. Isothermal and non-isothermal kinetics were studied. Activation energies for the crystallization process of around 300 KJ·mol−1 were obtained by the Kissinger method and the Johnson-Mehl-Avrami method.
Journal Article•
TL;DR: For 3987 accelerator-produced jets of 30--400-GeV protons in nuclear emulsion, s are individually calculated for each jet, where eta(theta) is a kinematic parameter introduced by us in 1967 in order to approximate the rapidity eta = arctanh(..beta.. costheta).
Abstract: For 3987 accelerator-produced jets of 30--400-GeV protons in nuclear emulsion, 's are individually calculated for each jet, where eta(theta) is a kinematic parameter introduced by us in 1967 in order to approximate the rapidity eta = arctanh(..beta.. costheta). Then by taking further averages by dividing the samples into groupings of the laboratory-system (LS) energy E/sub p/ of the primary proton ( = m/sub p/cosheta/sub p/), the number N/sub h/ of heavy prongs with LS velocity ..beta.. or approx. =0.7, the averages dlangleeta(theta)drangle are obtained. By use of the Koba-Nielsen-Olesen scaling variable xi = n/sub s//, we find good fits of the form dlangleeta(theta)drangle-eta/sub p//2 = A'+B'/xi, where A' and B' do not have any dependence on eta/sub p/ (i.e., on E/sub p/). The significance of our findings is discussed.