• Journal of Korean society of Dental Hygiene
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• v.23 no.1
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• pp.73-82
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• 2023

Objectives: This study aimed to evaluate the oral symptoms experiences of Korean adolescents among multicultural families. Methods: Data on 985 participants from the 16th Korea Youth Risk Behavior Web-based Survey were collected and analyzed using complex sample descriptive statistics. Results: The foreign-born mother, foreign-born parents, and foreign-born father rates were 77.2%, 17.3%, and 5.4%, respectively. The toothache, gingival bleeding, tooth fracture, and tooth sensitivity experience rates were 21.3%, 18.8%, 13.3%, and 30.4%, respectively. The tooth fracture rate was highest in the foreign-born parents group (24.6%). The toothache odds ratio (OR) was 1.71 (95% CI: 1.24-2.37) times higher in girls. The foreign-born mother group was 2.47 (95% CI: 1.09-5.60) times higher than that of the foreign-born father or both parents foreign-born groups. The smoking group was 2.03 (95% CI: 1.20-3.43) times higher than that of the non-smoking group. The gingival bleeding OR was 5.11 (95% CI: 1.80-14.53) times higher in the lowest economic status group. The tooth fracture OR was 3.44 (95% CI: 1.01-11.70) times higher in the lowest economic status group. The tooth sensitivity OR was 1.53 (95% CI: 1.14-2.04) times higher in girls. Conclusions: It is necessary to establish a program to promote oral health of adolescents from multicultural families.

• Journal of the Chungcheong Mathematical Society
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• v.15 no.2
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• pp.57-66
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• 2003

The various deformation spaces associated with maximal geometric structures on closed oriented 3-manifolds was studied in [2], leaving out the geometry of $\mathbb{R}^3$. In this paper, we study the Weil spaces and Teichm$\ddot{u}$ller spaces of non-orientable 3-dimensional flat Riemannian manifolds. In particular, we find the Teichm$\ddot{u}$ller spaces are homeomorphic to the Euclidean spaces $\mathbb{R}^4$ or $\mathbb{R}^3$ depending on the holonomy group $\mathbb{Z}_2$ or $\mathbb{Z}_2{\times}\mathbb{Z}_2$ respectively.

• MALSORI
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• no.33_34
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• pp.57-69
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• 1997

In this paper, 1 will try to examine the aspects of formants, based on the LPC analysis. In this analysis, five Japanese vowels (a, i, u, e, o) will experience two kinds of experiments: vowels in isolated forms, and vowels in carrier sentences. The analysis results of Japanese vowels of the Japanese natives show a peculiar feature that Japanese vowels form respective vowel groups. Each Japanese vowel makes a statistically significant difference. In the Fl analysis of the vowels grouped by the informant's sex, Japanese vowel (a) shows the greatest standard deviation without regard to the informant's sex. In the F2 analysis of Japanese vowels, each vowel has a statistically significant difference. The fact that the male's [u] shows great standard deviation means that there is a great difference of the frontness of the tongue among the Japanese males in articulating [u]. Isolated vowels and carried vowels show statistically little significance between Fl and F2 frequency values. In another contrastive analysis between the isolated vowel group and the carried vowel group, whether a vowel is articulated in isolation or in a sentence appears to have little effect on its formant frequency.

• Journal of the Korean Home Economics Association
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• v.37 no.1
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• pp.157-167
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• 1999

This study was designed to identify the recent status of the catalog and on-line apparel shopping in Korea and compare to those in the U.S.. Data were gathered from 308 respondents in Korea and 112 in the U.S. by the on-line survey. The results are as follows; 1) The U.S. consumers had more apparel shopping experience and higher level of satisfaction than Korean consumers about the catalog and on line apparel shopping, 2) Although the residents in Taejon area had less apparel shopping experience using catalog and on-line facilities than those in Seoul area, they showed higher level of interests about on-line shopping in Korea. 3) Male respondents had more shopping experience using pc-net and internet than female respondents, and the interests about on-line shopping of the younger group were higher than those of the older age group.

• Journal of Information Science Theory and Practice
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• v.5 no.1
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• pp.65-84
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• 2017

Three most popular information services, Periscope, Ustream, and YouNow, vicarious for all Social Live-Streaming Services (SLSSs), are investigated to analyze their streamers' motivations and the user-generated content. Additionally, we collected demographic data (gender and age). More than 7,500 streams by users from the U.S., Germany, and Japan were observed. Main streamer motivations on SLSSs are boredom, socializing, the need to reach a specific group, the need to communicate, and fun. Important content categories on all three SLSSs are chatting, sharing information, 24/7, and 'slice of life.' We were able to identify differences between users from the U.S., Germany, and Japan as well as between the users of Periscope, Ustream, and YouNow. The main motive to stream in the U.S. is to reach a specific group, while in Japan it is socializing, and in Germany boredom. The top content category for both, YouNow as well as Periscope, is to chat; on Ustream it is 24/7 (i.e., webcams).

• Kyungpook Mathematical Journal
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• v.62 no.2
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• pp.213-227
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• 2022

We discuss the relation between units and nilpotents of a ring, concentrating on the transitivity of units on nilpotents under regular group actions. We first prove that for a ring R, if U(R) is right transitive on N(R), then Köthe's conjecture holds for R, where U(R) and N(R) are the group of all units and the set of all nilpotents in R, respectively. A ring is called right UN-transitive if it satisfies this transitivity, as a generalization, a ring is called unilpotent-IFP if aU(R) ⊆ N(R) for all a ∈ N(R). We study the structures of right UN-transitive and unilpotent-IFP rings in relation to radicals, NI rings, unit-IFP rings, matrix rings and polynomial rings.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.706-709
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• 2008

최근 u-City나 Eco-City와 같이 IT 기술들이 도시 공간에 융합됨으로써 점차 지능형 도시로 발전되고 있고, 도시에 거주하는 사람들은 자신의 주변 상황에 맞게 자연스럽게 필요한 서비스를 제공 받게 될 것이다. 이와 같이 향후 유비쿼터스 도시 운영을 위해서는 다양한 GeoSensor를 도시 전체에 구축하고 계속해서 모니터링 해야 만 한다. 본 논문에서 제안한 룰 기반의 이벤트 처리 기술은 넓은 지역에 걸쳐 구축되어 있는 GeoSensor 네트워크로부터 센서 데이터를 수집하여 도시내에 발생되는 다양한 상황들을 효과적으로 모니터링 할 수 있다.

• The Bulletin of The Korean Astronomical Society
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• v.25 no.1
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• pp.38-38
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• 2000

• The Bulletin of The Korean Astronomical Society
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• v.25 no.1
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• pp.37-37
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• 2000

• Bulletin of the Korean Space Science Society
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• 2000.04a
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• pp.50-50
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• 2000

No Abstract, See Full Text