• Title/Summary/Keyword: informational space

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SOME PROPERTIES AROUND 1½ STARCOMPACT SPACES

  • CHO, MYUNG HYUN;PARK, WON WOO
    • Honam Mathematical Journal
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    • v.24 no.1
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    • pp.131-142
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    • 2002
  • A $1{\frac{1}{2}}$-starcompact space has one of the most curious properties among the spaces of starcompactness. It is not too far away from countably compact spaces and may be considered as the first candidate for extending theorems about countably compact spaces. Unfortunately, $1{\frac{1}{2}}$-starcompactness is not so easy to be recognized as 2-starcompactness which will follow from countable pracompactness. We investigate some properties around $1{\frac{1}{2}}$-starcompact spaces.

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INTERVAL-VALUED SMOOTH TOPOLOGICAL SPACES

  • Choi, Jeong-Yeol;Kim, So-Ra;Hur, Kul
    • Honam Mathematical Journal
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    • v.32 no.4
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    • pp.711-738
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    • 2010
  • We list two kinds of gradation of openness and we study in the sense of the followings: (i) We give the definition of IVGO of fuzzy sets and obtain some basic results. (ii) We give the definition of interval-valued gradation of clopeness and obtain some properties. (iii) We give the definition of a subspace of an interval-valued smooth topological space and obtain some properties. (iv) We investigate some properties of gradation preserving (in short, IVGP) mappings.

Intuitionistic Smooth Topological Spaces

  • Lim, Pyung-Ki;Kim, So-Ra;Hur, Kul
    • Journal of the Korean Institute of Intelligent Systems
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    • v.20 no.6
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    • pp.875-883
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    • 2010
  • We introduce the concept of intuitionistic smooth topology in Lowen's sense and we prove that the family IST(X) of all intuitionistic smooth topologies on a set is a meet complete lattice with least element and the greatest element [Proposition 3.6]. Also we introduce the notion of level fuzzy topology on a set X with respect to an intuitionistic smooth topology and we obtain the relation between the intuitionistic smooth topology $\tau$ and the intuitionistic smooth topology $\eta$ generated by level fuzzy topologies with respect to $\tau$ [Theorem 3.10].

Closure, Interior and Compactness in Ordinary Smooth Topological Spaces

  • Lee, Jeong Gon;Hur, Kul;Lim, Pyung Ki
    • International Journal of Fuzzy Logic and Intelligent Systems
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    • v.14 no.3
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    • pp.231-239
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    • 2014
  • It presents the concepts of ordinary smooth interior and ordinary smooth closure of an ordinary subset and their structural properties. It also introduces the notion of ordinary smooth (open) preserving mapping and addresses some their properties. In addition, it develops the notions of ordinary smooth compactness, ordinary smooth almost compactness, and ordinary near compactness and discusses them in the general framework of ordinary smooth topological spaces.

ON SUBMAXIMAL AND QUASI-SUBMAXIMAL SPACES

  • Lee, Seung-Woo;Moon, Mi-Ae;Cho, Myung-Hyun
    • Honam Mathematical Journal
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    • v.32 no.4
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    • pp.643-649
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    • 2010
  • The purpose of this paper is to study some properties of quasi-submaximal spaces and related examples. More precisely, we prove that if X is a quasi-submaximal and nodec space, then X is submaximal. As properties of quasi-submaximality, we show that if X is a quasi-submaximal space, then (a) for every dense $D{\subset}X$, Int(D) is dense in X, and (b) there are no disjoint dense subsets. Also, we illustrate some basic facts and examples giving the relationships among the properties mentioned in this paper.

Informational Analysis for Error Prediction of Emergency Tasks in Nuclear Power Plants (원자력발전소 비상운전 직무의 오류 예측을 위한 정보적 분석)

  • Jeong, Won-Dae;Kim, Jae-Hwan;Yun, Wan-Cheol
    • Journal of the Ergonomics Society of Korea
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    • v.18 no.3
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    • pp.41-53
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    • 1999
  • More than twenty HRA (Human Reliability Analysis) methodologies have been developed and used for the safety analysis in nuclear field during the past two decades. However, no methodology appears to have universally been accepted, as various limitations have been raised for more widely used ones. One of the most important limitations of conventional HRA is insufficient analysis of the task structure and problem space. To resolve this problem, we suggest a framework of informational analysis for HRA. The proposed informational analysis consists of three parts. The first part is the scenario analysis that investigates the contextual information related to the given task on the basis of selected scenarios. The second is the goals-means analysis to define the relations between the cognitive goal and task steps. The third is the cognitive function analysis that identifies the cognitive patterns and information flows involved in the task. Through the three-part analysis. systematic investigation is made possible from the macroscopic information on the tasks to the microscopic information on the specific cognitive processes. It is expected that analysts can attain a structured set of information that helps to predict the types and possibility of human error in the given task.

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The Influence of Social Supports on Intention to Use of Brands' SNS Page (사회적 지원기능이 브랜드 개설 SNS 페이지 소비자 수용에 미치는 영향에 관한 연구)

  • Lee, Yoon-Jae;Lee, Jeong-Hoon
    • Journal of Information Technology Applications and Management
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    • v.22 no.1
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    • pp.17-36
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    • 2015
  • Many companies are now trying to utilize SNS (social network service) by building it as marketing communication platform that delivers marketing messages and builds customer relationship. This study investigates the factors affecting consumers' intention to use of brand's SNS identity page (e.g., fan page in Facebook). It specifically focuses on four social support functions -self-esteem, informational, emotional and social networking support-in virtual space. Research model attempts to explore the impact of social supports on brands' SNS identity page adoption with modified technology acceptance model which includes perceived usefulness, ease of use and enjoyment. Empirical study adopts SEM (structural equation modelling) to test research model. The result indicates that perceived ease of use is influenced by informational support, and perceived usefulness is influenced by informational, emotional, and self-esteem support. And perceived enjoyment is influenced by emotional support. In addition, it reveals that there were no significant effects of social networking support on both perceived usefulness and enjoyment. These findings provide managerial implications for attracting potential and actual customers to brand's SNS identity page. And it also suggests the importance of managing sociability in brand's SNS identity page to make it as marketing communication platform.

On the Hàjek-Rènyi-Type Inequality for Conditionally Associated Random Variables

  • Choi, Jeong-Yeol;Seo, Hye-Young;Baek, Jong-Il
    • Communications for Statistical Applications and Methods
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    • v.18 no.6
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    • pp.799-808
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    • 2011
  • Let {${\Omega}$, $\mathcal{F}$, P} be a probability space and {$X_n{\mid}n{\geq}1$} be a sequence of random variables defined on it. A finite sequence of random variables {$X_i{\mid}1{\leq}i{\leq}n$} is a conditional associated given $\mathcal{F}$ if for any coordinate-wise nondecreasing functions f and g defined on $R^n$, $Cov^{\mathcal{F}}$ (f($X_1$, ${\ldots}$, $X_n$), g($X_1$, ${\ldots}$, $X_n$)) ${\geq}$ 0 a.s. whenever the conditional covariance exists. We obtain the H$\grave{a}$jek-R$\grave{e}$nyi-type inequality for conditional associated random variables. In addition, we establish the strong law of large numbers, the three series theorem, integrability of supremum, and a strong growth rate for $\mathcal{F}$-associated random variables.

INTUITIONISTIC FUZZY TOPOLOGICAL GROUPS

  • HUR, KUL;JUN, YOUNG BAE;RYOU, JANG HYUN
    • Honam Mathematical Journal
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    • v.26 no.2
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    • pp.163-192
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    • 2004
  • In this paper, we introduce the concepts of intuitionistic fuzzy subspaces, intuitionistic fuzzy topological groups and intuitionistic fuzzy quotient groups. And we investigate some of their properties.

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