• Journal of Computing Science and Engineering
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• 제3권2호
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• pp.90-108
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• 2009

In this paper, we present an ontology mediation solution based on the methods frequently used in Formal Concept Analysis. Our approach of mediation is based on the existence of instances associated to two source ontologies, then we can generate concepts in a new ontology if and only if they share the same extent. Hence our approach creates a merged ontology which captures the knowledge of these two source ontologies. The main contributions of this work are (i) to enable the creation of concepts not originally in the source ontologies, (ii) to propose a solution to label these emerging concepts and finally (iii) to optimize the resulting ontology by eliminating redundant or non pertinent concepts. Another contribution of this work is to emphasize that several forms of mediated ontology can be defined based on the relaxation of certain criteria produced from our method. The solution that we propose for tackling these issues is an automatic solution, meaning that it does not require the intervention of the end-user, excepting for the definition of the common set of ontology instances.

• 재무관리논총
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• 제2권1호
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• pp.127-144
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• 1995

Previous literature in financial economics documents the existence of a liquidity premium in expected returns, measured by the bid-ask spread. This study provides a more comprehensive test of the egect of liquidity on common stock returns by including trading volume as an additional liquidity measure. we find that trading volume is a relevant measure of liquidity, and affects expected returns even aher controlling for the effects of systematic risk, firm size, and the relative bid-ask spread. We also find that trading volume complements the bid-ask spread as a liquidity measure, and provides additional information about the liquidity premium. The liquidity effect emerges in non-January months as a volume effect, in addition to the spread effect in January documented by Eleswarapu and Reinganum(1993).

• Korean Journal of Mathematics
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• 제28권2호
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• pp.257-273
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• 2020

We introduce and study quasi hemi-slant submanifolds of almost contact metric manifolds (especially, cosymplectic manifolds) and validate its existence by providing some non-trivial examples. Necessary and sufficient conditions for integrability of distributions, which are involved in the definition of quasi hemi-slant submanifolds of cosymplectic manifolds, are obtained. Also, we investigate the necessary and sufficient conditions for quasi hemi-slant submanifolds of cosymplectic manifolds to be totally geodesic and study the geometry of foliations determined by the distributions.

• Journal of applied mathematics & informatics
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• 제20권1_2호
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• pp.465-478
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• 2006

In this paper, we introduce a new class of completely generalized strongly nonlinear quasivariational inequalities and establish its equivalence with a class of fixed point problems by using the resolvent operator technique. Utilizing this equivalence, we develop a three-step iterative scheme with errors, obtain a few existence theorems of solutions for the completely generalized non-linear strongly quasivariational inequality involving relaxed monotone, relaxed Lipschitz, strongly monotone and generalized pseudocontractive mappings and prove some convergence and stability results of the sequence generated by the three-step iterative scheme with errors. Our results include several previously known results as special cases.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.381-386
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• 2001

The dust generated from the electric arc furnace steel making process is classified as hazardous material by Korean Environmental Protection Acts, mainly because of the existence of water teachable Pb, Zn and Cd. Thus the treatment of EAF dust is being carried out to fulfill both the environmental aspect and recovery of valuable metals. To establish the proper process for recovering the valuable metals (Fe, Zn, Pb and Cd) and producing the non-toxic slag from EAF dust, using RAPID-10 system, feasibility study have been carried out. To find out the scale-up factor for designing the commercial scale EAF dust treatment process(capacity 50,000 ton EAF dust per year) entitled RAPID-50 system. The design and construction of RAPID-50 (RIST Arc Plasma Industrial Device) system for treating 50,000 ton of EAF dust per year is now undergoing. Overall plan for treating EAF dust generated in KOREA will be setup after successful operation (December, 2002) of RAPID-50 system.

• Communications for Statistical Applications and Methods
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• 제23권2호
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• pp.93-103
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• 2016

In the paper, we discuss dimension reduction of predictors ${\mathbf{X}}{\in}{{\mathbb{R}}^p}$ in a regression of $Y{\mid}{\mathbf{X}}$ with a notion of sufficiency that is called sufficient dimension reduction. In sufficient dimension reduction, the original predictors ${\mathbf{X}}$ are replaced by its lower-dimensional linear projection without loss of information on selected aspects of the conditional distribution. Depending on the aspects, the central subspace, the central mean subspace and the central $k^{th}$-moment subspace are defined and investigated as primary interests. Then the relationships among the three subspaces and the changes in the three subspaces for non-singular transformation of ${\mathbf{X}}$ are studied. We discuss the two conditions to guarantee the existence of the three subspaces that constrain the marginal distribution of ${\mathbf{X}}$ and the conditional distribution of $Y{\mid}{\mathbf{X}}$. A general approach to estimate them is also introduced along with an explanation for conditions commonly assumed in most sufficient dimension reduction methodologies.

• 호남수학학술지
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• 제42권1호
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• pp.123-137
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• 2020

The object of the present paper is to study certain geometrical properties of the submanifolds of generalized Sasakian space-forms. We deduce some results related to the invariant and anti-invariant slant submanifolds of the generalized Sasakian spaceforms. Finally, we study the properties of the sectional curvature, totally geodesic and umbilical submanifolds of the generalized Sasakian space-forms. To prove the existence of almost semiinvariant and anti-invariant submanifolds, we provide the non-trivial examples.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권11호
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• pp.5419-5435
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• 2017

The construction of panoramic images on smartphones and low-powered devices is a challenging task. In this paper, we propose a new approach for smoothly stitching images on mobile phones in the presence of moving objects in the scene. Our main contributions include handling moving object problems, reducing processing time, and generating rectangular panoramic images. First, unique and robust feature points are extracted using fast ORB method and a feature matching technique is applied to match the extracted feature points. After obtaining good matched feature points, we employ the non-deterministic RANSAC algorithm to discard wrong matches, and the hommography transformation matrix parameters are estimated with the algorithm. Afterward, we determine precise overlap regions of neighboring images and calculate their absolute differences. Then, thresholding operation and noise removal filtering are applied to create a mask of possible moving object regions. Sequentially, an optimal seam is estimated using dynamic programming algorithm, and a combination of linear blending with the mask information is applied to avoid seam transition and ghosting artifacts. Finally, image-cropping operation is utilized to obtain a rectangular boundary image from the stitched image. Experiments demonstrate that our method is able to produce panoramic images quickly despite the existence of moving objects.

• 한국언론정보학보
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• 제27권
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• pp.213-245
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• 2004

방송 통신의 융합이 진전됨에 따라, 방송과 통신이 분리되어 규제되는 현재의 법과 제도는 상당한 문제점을 일으키고 있다. 통신망과 방송망 허가의 실질적인 권한이 규제 기관별로 분리되어 있기 때문에 통신망과 방송망의 융합에 따른 이중규제의 문제뿐만 아니라 새롭게 탄생하고 있는 신규 융합서비스를 어떠한 서비스로 분류할 것인가에 대한 논란도 제기되고 있다. 따라서 원활한 방송 통신의 융합을 촉진시키고 기존의 방송과 통신 산업의 지속적인 발전을 도모하기 위하여 방송과 통신에 대한 합리적인 규제 차등화 기준과 방송과 통신의 중간영역에 위치한 서비스들에 대한 새로운 규제환경이 필요하다. 그러나 아직 방송과 통신의 융합에 적절히 대응하기 위한 사회적 합의는 이루어지지 않은 것으로 보인다. 비록 2004년 3월에 새로운 방송법이 통과되었지만, 통과된 방송법을 살펴보면 방송과 통신의 개념에 대한 논리적인 기준을 적용하기보다는 두 기관의 이익을 어느 정도 충족시킨 미봉책에 불과하다고 결론지을 수밖에 없다. 이는 새로운 유형의 서비스가 도입되었을 때, 정보통신부와 방송위원회가 또다시 소모적인 논쟁을 되풀이할 수밖에 없음을 의미하고, 이는 통신방송 융합서비스에 대한 논쟁이 여전히 일종의 '규제의 아노미 상태'에서 벗어나지 못하고 있음을 암시한다. 따라서 본 연구는 방송과 통신의 융합 환경 속에서 전통적인 방송과 통신의 개념에 바탕을 둔 서비스의 분류가 어려워지고 있음을 지적하고, 환경변화에 부합하는 새로운 융합서비스의 개념을 방송과 통신 공공재적 특성과 양방향적 특성에 기반하여 이해해 보고자 한다. 특히 본 논문은 방송과 통신의 융합현상에 대한 '논의의 정체'를 극복하기 위한 대안으로, 기존의 논의 틀을 발전적으로 해체하고, 이를 서비스의 본질적 속성이라는 '근원적 태생'을 기준으로 재구성함으로써, 관련 규제 체제의 정비에 지침을 마련할 필요성을 의식하는 데서 시작하였다. 즉, 임기응변적인 자의적 구분을 탈피하여, 기술적 특성과 그로 인해 비롯되는 서비스의 본질적 자이를 복합적으로 고려한 융합서비스의 적정 규제 기준을 제시해보고자 하는 것이다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.649-651
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• 2021

최근 들어, 부동산 매물에 대한 O2O 서비스가 웹 플랫폼 및 앱이 널리 보급되고 있다. 이로 인해서 매도자와 매수자, 부동산 중개업자는 빠르고 편리하게 부동산 매매, 전세 계약을 수행할 수 있다. 하지만, O2O 기반의 부동산 매물 정보시스템에서 가짜 정보 게시, 매물 정보에 대한 부분 수정, 고의적인 매물 정보의 미-게시로 인해서 부동산 매수자의 시간과 비용을 낭비하게 한다. 그러므로 우리는 웹 플랫폼에서 발생 가능한 부동산 매물정보들의 허위 여부를 검출 방식을 제안하고, 이에 관한 제안시스템을 설계 및 구현한다. 이를 위해서 분산 신원인증 프로토콜인 DID를 기반으로 한 개인신원증명과 매물정보 자체에 대한 검출 방식을 제안한다. 우리가 제안한 허위 부동산 매물정보 검출시스템은 3단계로 부동산 매물정보의 존재 여부 판별, 허위 매물 정보의 부분 수정 또는 고의적 미-게시 여부를 증명할 수 있다.