• Kyungpook Mathematical Journal
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• 제62권4호
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• pp.715-728
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• 2022

The aim of this article is to study the h-almost Ricci solitons and h-almost gradient Ricci solitons on generalized Sasakian-space-forms. First, we consider h-almost Ricci soliton with the potential vector field V as a contact vector field on generalized Sasakian-space-form of dimension greater than three. Next, we study h-almost gradient Ricci solitons on a three-dimensional quasi-Sasakian generalized Sasakian-space-form. In both the cases, several interesting results are obtained.

• 한국실내디자인학회논문집
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• 제27권1호
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• pp.3-11
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• 2018

The number of shared offices has increased and changed within the flow of the era into various forms in recent days. Co-working spaces and related shared space businesses are growing fast, keeping pace with the trend recently. It is confirmed that the need of spaces grew 180% since 2015 to 2017. Most of the shared offices in Seoul are placed in Gangnam circle, it is verified that shared office is providing work, space, and community by visiting cases of foreign companies, domestic companies, local companies. Meanwhile, shared space can be categorized into serviced office, co-working space, virtual office, and daily office. It is to consider various target levels by leasing service or the difference of costs. It is divided into forms of dispersion, circulation, and concentration and is planned to increase the utilization of communities' traffic according to the allocation of shared office. The business is conducted network-centered. During the process of communication, members can get chances to exchange and build communities. They are making business ecosystem which they can coexist and grow together. Shared offices have a view of a solution to empty rooms and will last for a while, and it is expected that co-working system be settled as office space and giving people sense of belonging on their workspace.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1986년도 하계학술대회논문집
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• pp.140-144
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• 1986

In this paper an FIR(finite impulse response) filter and smoother are introduced for discrete time-invariant state-space models with driving noises. The FIR structure not only quarantees the BIBO stability and the robustness to parameter changes but also improves the filter divergence problem. It is shown that the impulse responses of the FIR filter and the smoother are obtained by Riccati-type difference equations and that they are to be time-invariant and reduced to very simple forms. For implementational purpose, recursive forms of the FIR filler and smoother are derived with each other used as the adjoint variable.

• Journal of applied mathematics & informatics
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• 제24권1_2호
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• pp.471-478
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• 2007

In this article we shall introduce several operators on the reproducing kernel spaces and investigate quadratic forms on the $\mathcal{l}^2$ space. Using these operators we shall obtain a particular solution of a system of quadratic equations(1.5). Finally we can find an approximate solution of(1.5) by optimization of a nonnegative biquadratic polynomial.

• Korean Journal of Mathematics
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• 제14권2호
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• pp.249-258
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• 2006

The weakened forms of the (${\theta},s$)-continuous function are introduced and their basic properties are investigated in concern with the other weakened continuous function. The open property of a function and the extremal disconnectedness of the spaces are crucial tools for the survey of these functions.

• Kyungpook Mathematical Journal
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• 제53권4호
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• pp.625-638
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• 2013

First we present the explicit formula for the norm of a bilinear form on the 2-dimensional real predual of the Lorentz sequence space $d_*(1,w)^2$. Using this formula, we classify the extreme points of the unit ball of $\mathcal{L}(^2d_*(1,w)^2)$.

• 복식
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• 제56권1호
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• pp.121-130
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• 2006

Superimposition is a transforming technique that can facilitate the creation. Superimposition in previous studies, however, has only been fragmentary described as an expression technique, so the studies have not been conducted on the basis of its aesthetic value. The purpose of this study is to investigate how superimposition is applied and expressed in terms of forms of modern fashion based on multi-dimensional features of design processing. The codes of togetherness, ambivalence, sense of space and tension in dress were determined by using the expressional Superimposition. The forms of superimposition were limited to superimposition of clothing, superimposition of body and clothing and superimposition of body and Phenomenal body. This study found that superimposition has developed, in fashion forms/types, a new 'form' by overlapping various forms and thus provides a visual shock and a sense of mystery by using mismatched and arbitrary properties among the forms. Such a superimposition influences a methodology of fashion design through a designer's subjective tendencies, as well as influences a change in the view of the world. Also, a superimposition is expected to have a definite influence on new fashion trends.

• 한국실내디자인학회논문집
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• 제22권1호
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• pp.143-153
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• 2013

The purpose of this study is to explore how to make use of the light and expression methods to embody phenomenal space by considering the representation techniques and characteristics of a variety of 'Phenomenal light' in his works focused on the Steven Holl's views that thought the light as object of creating space. The process is summarized as follows: (1) Study on the relationship between light and color, Classify concept and type of phenomenal light by phenomenal color (2) Consider the characteristics and expression methods of the phenomenal light in the Steven Holl's architecture (3) Finally, organize the concepts and representation techniques of phenomenal light, and then present method to embody phenomenal space by light. According to this, the results are as follows: (1) Perceptual color by the light of the sense forms a variety of perception and texture of light and shadow according to the contrast of shades and the change of materiality, thus embodying multisensory space with the light as the medium approach that helps to experience formal and tactile senses. (2) Spatial color by the light of volume distinguishes the flow and movement of sight, and embody inducing space with the light as Atypical activity that forms atmosphere of space through concentrated or overlapped mass of light and darkness. (3) Existential color by the light of the light source visualizes the existence of the uncertain light, and embody the receptive space with the light as emotional communication that forms symbolic and psychological meaning through metaphorical phenomena of colored light.

• 대한수학회지
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• 제50권2호
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• pp.275-306
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• 2013

For two positive integers $m$ and $n$, let $\mathcal{P}_n$ be the open convex cone in $\mathbb{R}^{n(n+1)/2}$ consisting of positive definite $n{\times}n$ real symmetric matrices and let $\mathbb{R}^{(m,n)}$ be the set of all $m{\times}n$ real matrices. In this paper, we investigate differential operators on the non-reductive homogeneous space $\mathcal{P}_n{\times}\mathbb{R}^{(m,n)}$ that are invariant under the natural action of the semidirect product group $GL(n,\mathbb{R}){\times}\mathbb{R}^{(m,n)}$ on the Minkowski-Euclid space $\mathcal{P}_n{\times}\mathbb{R}^{(m,n)}$. These invariant differential operators play an important role in the theory of automorphic forms on $GL(n,\mathbb{R}){\times}\mathbb{R}^{(m,n)}$ generalizing that of automorphic forms on $GL(n,\mathbb{R})$.

• Kyungpook Mathematical Journal
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• 제58권1호
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• pp.149-165
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• 2018

A. Bejancu [2] was the first who instigated the new concept in differential geometry, i.e., CR-submanifolds. On the other hand, CR-submanifolds were generalized by B. Y. Chen [7] as slant submanifolds. Further, he gave the notion of a Kaehlerian slant submanifold as a proper slant submanifold. This article has two objectives. For the first objective, we derive Simons' type formula for a minimal Kaehlerian slant submanifold in a complex space form. Then, by applying this formula, we give a complete classification of a minimal Kaehlerian slant submanifold in a complex space form and also obtain its some immediate consequences. The second objective is to prove some results about semi-parallel submanifolds.