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Search Results: 1 - 10 of 340 matches for " JungAe Kwak "
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Ontology Matching Based on hypernym, hyponym, holonym, and meronym Sets in WordNet
JungAe Kwak,Hwan-Seung Yong
International Journal of Web & Semantic Technology , 2010,
Abstract: Considerable research in the field of ontology matching has been performed where information sharingand reuse becomes necessary in ontology development. Measurement of lexical similarity in ontologymatching is performed using synset, defined in WordNet. In this paper, we defined a Super Word Set,which is an aggregate set that includes hypernym, hyponym, holonym, and meronym sets in WordNet.The Super Word Set Similarity is calculated by the rate of words of concept name and synset’s wordsinclusion in the Super Word Set. In order to measure of Super Word Set Similarity, we first extractedMatched Concepts(MC), Matched Properties(MP) and Property Unmatched Concepts(PUC) from theresult of ontology matching. We compared these against two ontology matching tools – COMA++ andLOM. The Super Word Set Similarity shows an average improvement of 12% over COMA++ and 19%over LOM.
A Design of Incremental Granular Network for Software Data Modeling  [PDF]
Keun-Chang Kwak
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.311120
Abstract: In this paper, we propose an incremental method of Granular Networks (GN) to construct conceptual and computational platform of Granular Computing (GrC). The essence of this network is to describe the associations between information granules including fuzzy sets formed both in the input and output spaces. The context within which such relationships are being formed is established by the system developer. Here information granules are built using Context-driven Fuzzy Clustering (CFC). This clustering develops clusters by preserving the homogeneity of the clustered patterns associated with the input and output space. The experimental results on well-known software module of Medical Imaging System (MIS) revealed that the incremental granular network showed a good performance in comparison to other previous literature.
"Closing-in" phenomenon in Alzheimer's disease and subcortical vascular dementia
Yong Kwak
BMC Neurology , 2004, DOI: 10.1186/1471-2377-4-3
Abstract: We operationally defined and classified it into three types, namely overlap, adherent, and near type. We analyzed the incidence of it in patients with AD (n = 98) and SVD (n = 48).AD patients exhibited a significantly higher occurrence of it as compared to SVD patients. Among the different types of it, the overlap and adherent types occurred almost exclusively in AD patients. A discriminant analysis in AD subjects revealed that the scores obtained from the MMSE, CDR, Barthel index, and the Rey-Osterrieth complex figure test were correlated significantly with the occurrence of it. There was no statistical difference between the Q-EEG parameters of patients that exhibited the closing-in phenomenon and those that did not.This study suggests that the closing-in phenomenon is phase- and AD-specific and might be a useful tool for the differential diagnosis of AD and SVD.Alzheimer's disease (AD) and vascular dementia (VD) are the most common causes of dementia. Accurate differential diagnosis is essential to initiate appropriate treatment and to provide information about the prognosis and factors that may affect the course of the illness [1-4]. However, VD is not a single illness; it is comprised of dementia due to large artery stroke, subcortical vascular (or small vessel) dementia (SVD), and other less frequently observed vascular lesions [5].SVD affects the white matter and basal ganglia bilaterally and diffusely. It can lead to dementia that is characterized by impairment of behaviors, such as executive functioning, goal formation, initiation, planning, organizing, self maintenance, sequencing, and abstraction [6]. Whereas the cognitive impairments that follow a stroke tend to recede over time, SVD is often progressive and can be confused with AD. Stepwise deterioration and focal symptoms are not always symptoms of SVD [7]. Many previous neuropsychological studies comparing AD and VD have included multi-infarct patients or mixed groups of multi-infarct/SVD patients. Su
Local well-posedness for the fifth-order KdV equations on $\mathbb{T}$
Chulkwang Kwak
Mathematics , 2015,
Abstract: This paper is a continuation of the paper \emph{Low regularity Cauchy problem for the fifth-order modified KdV equations on $\mathbb{T}$}. In this paper, we consider the fifth-order equation in the Korteweg-de Vries (KdV) hierarchy as following: \begin{equation*} \begin{cases} \partial_t u - \partial_x^5 u + 30u^2\partial_x u + 20 u\partial_x u \partial_x^3u + 10u \partial_x^3 u = 0, \hspace{1em} (t,x) \in \mathbb{R} \times \mathbb{T}, \\ u(0,x) = u_0(x) \in H^s(\mathbb{T}) \end{cases}. \end{equation*} We prove the local well-posedness of the fifth-order KdV equation for low regularity Sobolev initial data via the energy method. This paper follows almost same idea and argument as in the paper \emph{Low regularity Cauchy problem for the fifth-order modified KdV equations on $\mathbb{T}$}. Precisely, we use some conservation laws of the KdV Hamiltonians to observe the direction which the nonlinear solution evolves to. Besides, it is essential to use the short time $X^{s,b}$ spaces to control the nonlinear terms due to \emph{high $\times$ low $\Rightarrow$ high} interaction component in the non-resonant nonlinear term. We also use the localized version of the modified energy in order to obtain the energy estimate. As an immediate result from a conservation law in the scaling sub-critical problem, we have the global well-posedness result in the energy space $H^2$.
Low regularity Cauchy problem for the fifth-order modified KdV equations on $\mathbb{T}$
Chulkwang Kwak
Mathematics , 2015,
Abstract: In this paper, we consider the fifth-order equation in the modified Korteweg-de Vries (modified KdV) hierarchy as following: \begin{equation*} \begin{cases} \partial_t u - \partial_x^5 u + 40u\partial_x u \partial_x^2u + 10 u^2\partial_x^3u + 10(\partial_x u)^3 - 30u^4 \partial_x u = 0, \hspace{1em} (t,x) \in \mathbb{R} \times \mathbb{T}, \\ u(0,x) = u_0(x) \in H^s(\mathbb{T}) \end{cases}. \end{equation*} We prove the local well-posedness of the fifth-order modified KdV equation for low regularity Sobolev initial data via the energy method. We use some conservation laws of the modified KdV Hamiltonians (or a partial property of complete integrability) to absorb some \emph{linear-like} resonant terms into the linear propagator. Also, we use the nonlinear transformation, which has the bi-continuity property, to treat the rest of \emph{linear-like} resonant terms. Besides, it is essential to use the short time $X^{s,b}$ spaces to control the nonlinear terms due to \emph{high $\times$ low $\times$ low $\Rightarrow$ high} interaction component in the non-resonant nonlinear term. We also use the localized version of the modified energy in order to control the \emph{high-low} interaction component in the original energy. As a purpose and consequence of this work, we emphasize that under the periodic setting, to study the low regularity well-posedness problem somewhat relies on the theory of complete integrability. This is the first low regularity well-posedness result for the fifth order modified KdV equation under the periodic setting.
Generic Projection Methods in Castelnuovo Regularity of Projective Varieties
Sijong Kwak
Mathematics , 1998,
Abstract: Castelnuovo-Mumford regularity is an important invariant of projective algebraic varieties. A well known conjecture due to Eisenbud and Goto gives a bound for regularity in terms of the codimension and degree,i.e., Castelnuovo-Mumford regularity of a given variety X is less than or equal to deg(X)-codimension(X)+1. Generic projection methods proved to be effective for the study of regularity of smooth projevtive varieties of dimension at most four(cf.[BM},[K2],[L],[Pi] and [R1]) because there are nice vanishing theorems for cohomology of vector bundles (e.g. the Kodaira-Kawamata-Viehweg vanishing theorem) and detailed information about the fibers ofgeneric projections from X to a hypersurface of the same dimension. Here we show by using methods similar to those used in [K2] that $\reg{X}\le(deg(X)-codimension(X)+1)+10$ for any smooth fivefold and $\reg{X}\le(deg(X)-codimension(X)+1)+20$ for any smooth sixfold. Furthermore, using similar methods we give a bound for the regularity of an arbitrary (not necessarily locally Cohen-Macaulay) projective surface X in P^N. To wit, we show that $\reg{X}\le(d-e+1)d-(2e+1)$, where d=deg(X) and e=codimension(X). This is the first bound for surfaces which does not depend on smoothness.
Castelnuovo-Mumford Regularity of Smoth Threefolds in P^5
Sijong Kwak
Mathematics , 1998,
Abstract: Castelnuovo-Mumford regularity is an important invariant of projective algebraic varieties. A well known conjecture due to Eisenbud and Goto gives a bound for regularity in terms of the codimension and degree,i.e., Castelnuovo-Mumford regularity of a given variety $X$ is less than or equal to $deg(X)-codim(X)+1$. This regularity conjecture (including classification of examples on the boundary) was verified for integral curves (Castelnuovo, Gruson, Lazarsfeld and Peskine), and for smooth surfaces (Pinkham, Lazarsfeld). In this paper we prove that $reg(X) \le deg(X)-1$ for smooth threefolds $X$ in P^5 and that the only varieties on the boundary are the Segre threefold and the complete intersection of two quadrics. Furthermore, every smooth threefold $X$ in P^5 is $k$-normal for all $k \ge deg(X)-4$, which is the optimal bound as the Palatini 3-fold of degree 7 shows.
Castelnuovo regularity for smooth projective varieties of dimensions 3 and 4
Sijong Kwak
Mathematics , 1998,
Abstract: Castelnuovo-Mumford regularity is an important invariant of projective algebraic varieties. A well known conjecture due to Eisenbud and Goto gives a bound for regularity in terms of the codimension and degree. This conjecture is known to be true for curves (Gruson-Lazarsfeld-Peskine) and smooth surfaces (Pinkham, Lazarsfeld), but not in general. The purpose of this paper is to give new bounds for the regularity of smooth varieties in dimensions 3 and 4 that are only slightly worse than the optimal ones suggested by the conjecture. Our method yields new bounds up to dimension 14, but as they get progressively worse for higher dimensions, we have not written them down here.
The Effects of Aroma Hand Massage on Fatigue and Sleeping among Hospice Patients  [PDF]
Heeok Park, Youngmi Chun, Sooyoung Kwak
Open Journal of Nursing (OJN) , 2016, DOI: 10.4236/ojn.2016.67054
Abstract: Purpose: The purpose of this study was the comparative effects on fatigue and sleep of aroma hand massage vs. hand massage among hospice patients in a hospital. Methods: The design of this study was a nonequivalent comparison group pretest-posttest design. This study was performed from May to December 2012 in a hospice ward. A total of 30 hospice patients in a hospice ward participated in the study (17 in an aroma massage group and 13 in a massage group). The Piper Fatigue Scale was used to measure the fatigue level. The quantity of sleep was measured using sleep hours and the quality of sleep using the Verran & Snyder-Halpern sleep scale (1987). The aroma massage group used 1:1 lavender and bergamot diluted to 1% with 100 ml jojoba carrier oil. The massage group used carrier oil without an essential oil. Each treatment was performed for 10 minutes prior to the subject’s sleeping time, once a day and for 5 days. Data were analyzed using t-test, x2-test, Fisher’s exact test and the repeated measures ANOVA with the SPSS program. Results: The increase in the fatigue and decrease in the sleep quantity were lower in the aroma hand massage compared to the only hand massage but they were not statistically significant. Conclusion: The quality of sleeping improved in the aroma hand massage group compared to the control group even though it was not significant. For the further studies, assessing and respecting the patient’s aroma preference were important considerations when providing aromatherapy and the appropriation of using 1% essential oil to dilute needs to be tested for the hospice patients in the further studies
The Development of Software Pricing Schemata and Its Application to Software Industry in Korea
Youngsik Kwak,Yunkyung Lee,Yoonsik Kwak
International Journal of u- and e- Service, Science and Technology , 2010,
Abstract: The purpose of this this research is to suggest comprehensive pricing schemata that software developers can use in the integrated state of software uses. To do so, we have reviewed the pricing criteria that the current fields of business administration treat andoffered the basis of pricing systems. Then we have applied the prices of software products in Korea to the systems and earned abundant price payment units. As for the research works of software pricing at the present, however, it seems that they are mainly focused on the uses and functions of some specific software rather than on general variables that affect the software pricing policies of PC and Client/Server environment. There have been many researches on individual consumption features such as on the case of upgrade, on the case of outsourcing like ASP, on the case of pricing package items, or on the case of ERP software.[1-5] In other words, there have been few researches on the schemata of pricing that software developers can use. This paper aims to suggest a comprehensive pricing schemata that software developers, sellers, and distributers can use regardless of the state of software uses. To do so, first, itreviews the criteria of pricing that are frequently discussed in the current fields of economics and management and thereby establishes the basis that leads to a pricing schemata. Then the prices of software in Korea will be applied to the schemata, which will eventually make it possible to produce the complete pricing schemata unique in Korea.
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