• Journal of the Korean Mathematical Society
• /
• v.42 no.4
• /
• pp.673-693
• /
• 2005

In this paper, we first find a necessary and sufficient condition for the existence of multiple orthogonal polynomials by the moments of a pair of measures $(d{\mu},\;dv)$ and then give representations for multiple orthogonal polynomials. We also prove four term recurrence relations for multiple orthogonal polynomials of type II and several interesting relations for multiple orthogonal polynomials are given. A generalized recurrence relation for multiple orthogonal polynomials of type I is found and then four term recurrence relations are obtained as a special case.

• Journal of Digital Contents Society
• /
• v.5 no.3
• /
• pp.180-186
• /
• 2004

XML has an essential funtion of dealing with standardized document to be used in all academic areas and industrial areas as well as e-commerce. The transformation of XML data into Relation Database table is also necessary for data search using SQL language. Mapping relation between XMLand Table in Relation Database is required for transformation of XML. This arti치e studies the mapping relation between XML and Relation Database using DTD which enables to check the unity automatically whenever document is read so that it studied mapping design for the transformation of XML data info Relation Database table.

• Journal of the Korean Institute of Landscape Architecture
• /
• v.19 no.3
• /
• pp.16-26
• /
• 1991

The traditional housing of Cheju Island has been steadily researched, but from the point of an environmental view which has been neglectly treated all the while, the formative process of the housing and its relationship to the structure of a village are studied, so the writer summarized the relation to the housing type. To study the peculiarity of the physical space, a type of a way, and element of the spatial structure, by stage and a type of the arrangement of the residential space are researched and analyzed, and to understand the plane peculiarity, the distribution of the plane type has been studied. In consequence, the housing and the structure and the form of the village have an organic relation each other and have been made under a very diverse and mixed background, we can find. Especially, the element of the natural environment acts as an important element which decides the type of life and the residential type. The arrangement of buildings is gradually free from the traditional type, but a traditional type of "Three-Room House" is kept well in spite of a change of the plane type.

• Journal of Astronomy and Space Sciences
• /
• v.17 no.2
• /
• pp.151-162
• /
• 2000

The general properties of the NCBs, divided into A and F types according to their spectral types, have been presented. The evolutionary status of the F type near-contact binaries are closer to that of the contact systems, i.e., W UMa type binaries, if it is assumed that the evolution of the NCBs is governed by the thermal relaxation oscillation theory. The mass-radius relation, mass-luminosity relation and H-R diagram of the NCBs provide that the A type NCBs suffer from more active mass transfer than F types. The components of the NCBs ar still in main-sequence like W UMa type stars and their two components lines parallel to the ZAMS.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
• /
• v.25 no.2
• /
• pp.287-295
• /
• 1995

The purpose of this study was to evaluate the prevalence, the distribution, and the relation with adjacent roots of idiopathic osteosclerosis in the jaws by means of analysis of 7,837 persons' panoramic radiographs. The following results were obtained ; 1. The prevalence of idiopathic osteosclerosis in the jaws in panoramic radiographs was revealed to be 9.76％ in total examined persons. There was a higher prevalence in males(10.10％) than in females(9.76％). 2. There was also a higher prevalence in the mandible(97.92％) than in the maxilla(2.08％). The most frequently involved area was the mandibular molar area(34.72％), followed by mandibular premolar area(33.37％). 3. According to the types of idiopathic osteosclerosis with relation to adjacent roots, separated type(51.59％) was the most frequent, followed by apical type(32.52％), interradicular type(7.95％), apical and interradicular type(7.95％) in descending order of frequency.

• Journal of The Korean Astronomical Society
• /
• v.55 no.2
• /
• pp.37-57
• /
• 2022

Using I-band images of 35 nearby (z < 0.1) type 1 active galactic nuclei (AGNs) obtained with Hubble Space Telescope, selected from the 70-month Swift-BAT X-ray source catalog, we investigate the photometric properties of the host galaxies. With a careful treatment of the point-spread function (PSF) model and imaging decomposition, we robustly measure the I-band brightness and the effective radius of bulges in our sample. Along with black hole (BH) mass estimates from single-epoch spectroscopic data, we present the relation between BH mass and I-band bulge luminosity (M_BH-M_I,bul relation) of our sample AGNs. We find that our sample lies offset from the M_BH-M_I,bul relation of inactive galaxies by 0.4 dex, i.e., at a given bulge luminosity, the BH mass of our sample is systematically smaller than that of inactive galaxies. We also demonstrate that the zero point offset in the M_BH-M_I,bul relation with respect to inactive galaxies is correlated with the Eddington ratio. Based on the Kormendy relation, we find that the mean surface brightness of ellipticals and classical bulges in our sample is comparable to that of normal galaxies, revealing that bulge brightness is not enhanced in our sample. As a result, we conclude that the deviation in the M_BH-M_I,bul relation from inactive galaxies is possibly because the scaling factor in the virial BH mass estimator depends on the Eddington ratio.

• The Bulletin of The Korean Astronomical Society
• /
• v.40 no.2
• /
• pp.48.3-49
• /
• 2015

Scaling relations of early-type galaxies (ETG) provide a deep insight into their formation and evolution. Interestingly enough, most relations extending into the dwarf regimes display non-linear or broken-linear features, unlike the linear relations for normal (i.e., intermediate-mass to giant) ETGs only. Here we investigate the mass-size scaling relation of ETGs using a massive database of galaxies from SDSS DR12. We divide ETGs into two groups by the indication of star formation such as colors, and examine their distinction along the mass-size relation. We find that the mass-size distribution of blue, young normal galaxies is in good agreement with that of dwarf ETGs. Our result suggests that blue, young normal ETGs may serve as links between (passive) normal ETGs and dwarfs. We discuss the possibility of blue, young ETGs being progenitors of dwarf ETGs.

• Bulletin of the Korean Mathematical Society
• /
• v.48 no.5
• /
• pp.939-949
• /
• 2011

In this paper we give two matching theorems of Ky Fan type concerning open or closed coverings of nonempty convex sets in a topological vector space. One of them will permit us to put in evidence, when X and Y are convex sets in topological vector spaces, a new subclass of KKM(X, Y) different by any admissible class $\mathfrak{u}_c$(X, Y). For this class of set-valued mappings we establish a KKM-type theorem which will be then used for obtaining existence theorems for the solutions of two types of simultaneous relation problems.

• Fashion & Textile Research Journal
• /
• v.12 no.3
• /
• pp.327-337
• /
• 2010

The current study investigates e-CRM, Shopping-mall Image, Perceived Value, Immersion, Satisfaction, Purchase Intention in the Fashion e-Commerce. The e-CRM(Customer Relationship Management) was applied to see the effect on the relation quality toward the fashion shopping-mall via relation performance. To fulfill the study objectives, a total of 521 questionnaires(Korean 278 vs, American 243) were conducted to the customers with first-hand experience with fashion merchandise in Internet shopping-mall. The judgement sampling method was employed on sample population ages from 20s to 40s over two month period. The result showed that purchase intention of an individual differs by consumer type and different factors affect purchase intention of the fashion merchandise for each consumer type.

• Bulletin of the Korean Mathematical Society
• /
• v.61 no.1
• /
• pp.217-227
• /
• 2024

Let G be an infinite countable group and A be a finite set. If Σ ⊆ A^G is a strongly irreducible subshift of finite type and 𝓖 is the local conjugacy equivalence relation on Σ. We construct a decreasing sequence 𝓡 of unital C^*-subalgebras of C(Σ) and a sequence of faithful conditional expectations E defined on C(Σ), and obtain a Toeplitz algebra 𝓣 (𝓡, 𝓔) and a C^*-algebra C^*(𝓡, 𝓔) for the pair (𝓡, 𝓔). We show that C^*(𝓡, 𝓔) is *-isomorphic to the reduced groupoid C^*-algebra C^*_r(𝓖).