• 한국작물학회지
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• 제30권4호
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• pp.427-430
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• 1985

수도의 1대잡종 종자생산을 위한 기초적인 정보를 얻고자 한국품종 배경의 세포질적 유전적 웅성불임계통 수원296A, 수원304A 및 수원310A와 유전적 웅성불임계통 수원296GMS 등과 대조품종인 중공의 세포질적 유전적 웅성불임계통 Zhenshan97A를 공시하여 주두노출정도, 시간별 개영수 및 개영각도 변화 등을 조사하고 자연교잡률과 관련시켜 검토한 바 다음과 같은 결과를 얻었다. 1. 한국품종을 배경으로 한 웅성불임계통들의 주두노출 정도가 중공의 CGMS Zhenshan97A 보다 불량하였고 특히 Japonica형 CGMS인 수원304A의 주두노출이 불량하였다. 2. 시간별 개영수의 Peak의 조만과 유무는 자연교잡률과 관련이 적었다. 3. 개영각이 크고 장시간 개영이 지속되는 웅성불임계통의 자연교잡이 높았다. 개영각이 작으면서 장시간 개영되어도 효과가 적었다. 4. 동일품종을 배경으로 했을 경우 GMS가 CGMS보다 자연교잡에 유리했다. 5. 웅성불임계통은 정상계통에 비해 개영 지속시간이 길었다.

• 한국학교보건학회지
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• 제32권2호
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• pp.125-134
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• 2019

Purpose: The purpose of this study was to investigate the effects of sedentary behavior on subjective health in Korean adolescents. Methods: This study is designed as a cross-sectional study. The study sample comprised of 60,040 middle and high school students primarily at the age of 12 to 17. Using data from the 14th (2018) Korea Youth Risk Behavior Web-based Survey, multiple logistic regression analysis was conducted. Results: The rate of engaging in sedentary behavior for less than 2 hours was 28.4% and for more than 4 hours was 28.2% in Korean adolescents. In the result from the logistic regression analysis, compared to engaging in sedentary behavior for 2 hours or less, the adjusted odds ratio was 1.15 for over 4 hours, with other factors controlled. Conclusion: It is necessary to actively develop and promote active leisure activities and limit excessive media exposure and supplementary learning for adolescents.

• 한국학교보건학회지
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• 제31권3호
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• pp.127-134
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• 2018

Purpose: The aim of the research was to define the effects of body image, career identity, and family health on depression in college students. Methods: This descriptive research was conducted from the 1st to the 16th of July, 2018. The data was collected through convenience sampling of 222 college students. To draw conclusions from the data, we used statistical analysis of Pearson's correlation coefficients and stepwise multiple regression using SPSS/WIN 21.0. Results: Depression showed negative correlations with body image, career identity and family health. Multiple regression revealed that the factors significantly influencing depression were body image, career identity, and gender. The total explanation of depression by these variables was 29.9%. Conclusion: These findings indicate that intervention strategies to prevent and manage depression in college students should include programs to help them develop positive body image and career identity, considering gender differences.

• 대한건축학회논문집:계획계
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• 제36권4호
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• pp.23-29
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• 2020

The latest urban planning is taking advantage of the city's spatiality, and its weight is increasing. The spatiality of the city extends to the three-dimensional air space, including the underground space and the surface space, and this is the relative location of land-use situations utilizing the characteristics of the feng shui geography. In this study, the urban planning of the Suwon Department and the construction process of the Suwon Hwaseong Fortress were analyzed based on the feng shui geography, using the topography and geographical features of Paldal Mountain as the center of the data. Natural-friendly urban planning is required to adapt to natural laws and to preserve and share the ecosystem while harmonizing with the surrounding environment.

• 무역학회지
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• 제44권3호
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• pp.73-84
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• 2019

This study focuses on previous research that explored the external knowledge reflecting the characteristics of SMEs and that should be considered because of the limited capacity of SMEs. This study examines the effects of open innovation and SMEs on export performance, focuses on government support as a way to supplement the limited capacity of SMEs, and analyzes the moderating effects of government support. An examination of 1,358 samples revealed that the breadth of external knowledge, depth of external knowledge, and government support had a significant impact on the export performance of SMEs. The effect of exploration of external knowledge (breadth and depth) of SMEs on the export performance of SMEs is significant both in breadth and depth when government support is provided, but only depth is significant when there is no government support.

• Bulletin of the Korean Chemical Society
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• 제17권4호
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• pp.338-342
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• 1996

A sensitive method for the determination of trace cadmium after the preconcentration by extracting its 8-hydroxyquinoline complex into a molten benzophenone was developed. Several experimental conditions such as the pH of solution, the amounts of 8-hydroxyquinoline and benzophenone, stirring time, and standing time were optimized. Trace cadmium in 100 mL water sample was chelated with 2.5 mL of 0.001 M 8-hydroxyquinoline at pH 8.0. After 0.07 g benzophenone was added, the solution was heated to about 70 ℃ and stirred vigorously for 1 minute to dissolve the complex quantitatively in a molten benzophenone, and stood for 30 minutes to reproduce the microcrystalline benzophenone. The benzophenone containing Cd-8-hydroxyquinoline complex was filtered and dissolved in acetone. Cadmium was determined by a flame atomic absorption spectrophotometry. The interfering effects of diverse concomitant ions were investigated and eliminated. This method could be applied to natural water samples and the recovery of more than 90% was obtained in the real samples.

• 정보보호학회논문지
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• 제18권5호
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• pp.195-199
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• 2008

이 논문에서는 ASIAN 2007에서 Nakazato, Wang, Yamamura 등이 발표한 프라이버시가 강화된 크레덴셜 시스템에서 크레덴셜 발급자인 서버의 도움 없이도 사용자와 검증자가 공모하는 경우에 크레덴셜을 위조할 수 있음을 보인다. 이 공격은 크레덴셜의 생성과정에서 사용하는 서버의 비밀키를 겹선형 사상의 성질을 이용해서 우회하는 방법을 이용한다. 또한, 이 공격방법의 이론적인 영향과 실질적인 영향을 고찰해 본다.

• 정보보호학회논문지
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• 제16권5호
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• pp.113-118
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• 2006

가명을 이용한 시스템에서는 가명을 발급한 기관에게도 사용자의 익명성이 유지되어야 하며, 다만 정책적으로 사용자가 규칙을 어겼을 때는 가명으로부터 사용자의 신원정보를 추적할 수 있어야 한다. 이 논문에서는 m--out-of-n oblivious transfer와 cut-and-choose 기술을 이용하여 추적 가능한 가명 은닉 획득 프로토콜을 제안한다.

• 정보보호학회논문지
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• 제22권6호
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• pp.1265-1270
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• 2012

이 논문에서는 래티스(Lattice)의 CVP (Closest Vector Problem)에 기반한 영지식 증명 기반의 인증프로토콜을 제안한다. CVP를 이용해서 암호시스템을 설계할 때 흔히 사용하는 길이가 짧은 기저벡터를 트랩도어 또는 비밀키로 사용하지 않는 프로토콜로서 의의를 가지며, 프로토콜의 설계가 단순하고 안전성 증명도 쉬워진다. 제안한 프로토콜의 안전성을 completeness, soundness, simulatability로 증명한다.

• 정보보호학회논문지
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• 제19권6호
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• pp.195-199
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• 2009

이 논문에서는 CDH가정에 안전성을 기초로 하는 공격자가 참여하는 새로운 문제를 정의하고 이의 안전성을 증명한다. 이 새로운 문제는 암호 프로토콜의 설계에서 프리미티브로 이용될 수 있다. 이 논문에서는 이 문제의 응용 예로 새로운 identification 기법을 보인다. 또한, 이 문제의 판별 버전(decisional version)에 대해서도 살펴본다.