• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제17권2호
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• pp.129-138
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• 2013

A spatio-temporal models as systems of ODE which describe two-species Beddington - DeAngelis type predator-prey system living in a habitat of two identical patches linked by migration is investigated. It is assumed in the model that the per capita migration rate of each species is influenced not only by its own but also by the other one's density, i.e. there is cross diffusion present. We show that a standard (self-diffusion) system may be either stable or unstable, a cross-diffusion response can stabilize an unstable standard system and destabilize a stable standard system. For the diffusively stable model, numerical studies show that at a critical value of the bifurcation parameter the system undergoes a Turing bifurcation and the cross migration response is an important factor that should not be ignored when pattern emerges.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2008년도 하계학술발표대회 논문집
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• pp.142-147
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• 2008

This paper reports an analysis of self-pressurization in a closed cryogenic liquid storage system and its comparison with experimental data using liquid nitrogen. Partial equilibrium model(PEM), revised thermodynamic analysis of homogeneous model, has been applied for the pressurization in a closed tank. The vapor and liquid bulk temperature and the liquid-vapor interface temperature are separately calculated as their own representative values in this analysis. The analysis results of the partial equilibrium model are compared with the experimental data and other preceding homogeneous temperature models for validation.

• 영어어문교육
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• 제13권2호
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• pp.91-108
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• 2007

This study investigates learners' perception on their engagement in rating activities in the EFL essay-writing context. The current study aims to address the answers to the following research questions: 1) What attitude do students show about their participation in the rating tasks? and 2) which of three aspects (e.g. the degree of rating experience, the exposure to English composition instruction and learning, and proficiency level) significantly influences learners' rating activities? 104 EFL learners participated in the rater training session. After participants finished rater training session, they rated three sample essays and peer essays using the given scoring guide. Based on the analysis of survey responses that students made, students showed positive attitude toward their engagement in rating tasks. For research question 2, only L2 writing proficiency seriously affected students' perception on the rating tasks. Advanced level of subjects did not feel stressed by a grade of peers as low level of subjects did. They were also critical about the benefits of self- and peer-assessment, suggesting that a peer's feedback on their own essay was not so useful and that a self-rating does not fully help learners identify their writing proficiency.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 하계학술대회 논문집
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• pp.394-396
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• 2007

In this paper proposed to neural network PI self-tuning direct controller using Error back propagation algorithm. Proposed controller applies to speed controller and current controller. Also, this built up the interface environment to drive it simply and exactly in any kind of reference, environment fluent and parameter transaction of PMSM. Neural network PI self-tuning simulator using Visual C++ and Matlab Simulation is organized to construct this environment, Built up interface has it's own purpose that even the user who don't have the accurate knowledge of Neural network can embody operation characteristic rapidly and easily.

• Journal of information and communication convergence engineering
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• 제2권2호
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• pp.97-101
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• 2004

This paper is about the use of existing evaluation methods, which evaluate learning determined by the score of an exam, which is either a multiple-choice type or single choice type question. These scores don't show the objective evaluations that cause some negative opinions about the scores. In this paper, we propose that the evaluation of the methods of self-directed learning use the triangle-type function of the fuzzy theory so that the learner can objectively evaluate their own learning ability. The proposed method classifies the result of learning into three fuzzy grades to calculate membership, and evaluate the result of an exam according to the final fuzzy grade degree as applied to the fuzzy grade sheets.

• 대한안전경영과학회지
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• 제14권4호
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• pp.169-175
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• 2012

Self-Inspection is being used in the workplace hazardous, dangerous machinery and equipment to build capacity for the voluntary safety risks due to use of machinery and prevention of industrial accidents that inspect facilities for safety issues, is to check. However, December 31, 2008 as part of Article 36 of the Occupational Safety and Health Act (safety inspection), the financial vanish as the self-test, Safety inspection program has been changed., In each individual workplace that creates its own standards and regulations to use the existing inspection system is in some cases. This study is located in the southeast industrial complex as a risk reducer manufacturer, machine-based target zones in S Corp owns most of the crane based on the results of the tests is to analyze the problem. Then check the results - to bring its measures and information you need to know for sure is to propose.

• 전자통신동향분석
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• 제34권3호
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• pp.114-124
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• 2019

The Internet was designed for machines, not humans, and hence, nobody owns a digital identity. Instead, a digital identity is rented from a website and an application. This lack of unique and secure digital identities has resulted in confusion in the online/cyber world. Digital identities pose one of the oldest and most difficult problems with regard to the Internet. There is still no way to use digital credentials to prove, own, and control an online identity, namely a self-sovereign identity, in the same manner we do in the offline world, particularly without a trusted third party. This article discusses the current open standards for digital identities, proposes solutions pertaining to digital identities in the future, and introduces the concept of a blockchain-based self-sovereign digital identity without the need of trusted third parties.

• 가정과삶의질연구
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• 제28권1호
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• pp.145-157
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• 2010

This is a study that explores the influence of self-differentiation and acculturation among married immigrant women on their feelings of marriage satisfaction by residential area. The aim was to verify the level of self-differentiation and acculturation that married immigrant women secure from multicultural marriage. To achieve this objective, the study widely distributed a questionnaire that targeted women who were participating in education and other services at health and family support centers, multi-cultural family support centers, general social welfare centers, immigrant women shelters, and Korean language classrooms which are located in Seoul, Gyeonggi, Chungcheong, Jeolla, and Gyeongsang. Data analysis involved frequency analysis, descriptive statistics, one-way-Anova, and multiple regression analysis. Based on the results of descriptive statistics, two factors, namely, (1)interpersonal-relation differentiation, a sub-scale of self-differentiation, and (2)marginalization, a sub-scale of acculturation, had the lowest average. In verifying its various hypotheses, the study achieved the following results. Firstly, among demographic characteristics, there was difference of the mean in the marriage period, average monthly income, the frequency of meetings with the married woman´s parents-in-law and her own parents, and the average cost of supporting the woman's parents-in-law and her own parents. Secondly, among demographic characteristics, the variable of influencing marriage satisfaction showed negative influence in the case of women dwelling in farming and fishing villages. This shows that women residing in cities whether small, medium or large have higher marriage satisfaction. Also, as a result of verifying whether self-differentiation has influence on marriage satisfaction, the element of interpersonal-relations differentiation had a negative influence on marriage satisfaction. Thirdly, as for influence of acculturation upon marriage satisfaction, the study showed that just integration, which is a sub-scale of acculturation had positive effect on marriage satisfaction. In other words, the study showed that the interpersonal-relation differentiation among the sub-scales of self-differentiation among married immigrant women had a negative influence, and that integration among the sub-scales in acculturation had a positive influence on marriage satisfaction. Based on these results, in order to increase interpersonal-relation differentiation, as well as marriage satisfaction among immigrant women, the study suggests the integration of the women's families with the nuclear and extended families in the communities where the women reside.

• 직업교육연구
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• 제37권1호
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• pp.119-138
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• 2018

이 연구에서는 중고령 자영업자를 대상으로 일자리 이탈 시점 및 일자리 이탈에 영향을 미치는 요인을 분석하고자 하였다. 고령화연구조사(KLoSA) 2006년 1차 조사대상자 중 자영업 시작 시기가 40세 이상인 684명을 대상으로 2014년 5차 조사 시기까지의 자료를 활용하여 콕스비례위험모형을 활용하였다. 이 연구의 주요 결론을 제시하면 다음과 같다. 첫째, 2005년 자영업을 운영하던 중고령 자영업자의 일자리 지속기간은 평균 15.5년으로 나타났으며 전체 684명 중 214명(31.3%)의 자영업자가 조사기간 내에 일자리를 이탈한 것으로 분석되었다. 둘째, 개인적 특성에서 성별, 창업 시 연령, 교육수준이 중고령 자영업자의 일자리 이탈에 유의미하게 영향을 미치는 것으로 나타났다. 여성일 때, 창업 시 연령이 많을 때, 대학 이상의 학력일 때 자영업 이탈에 대한 위험이 증가하였다. 셋째, 자영업 특성에서 업종과 직무만족이 중고령 자영업자의 일자리 이탈에 영향을 미치는 것으로 나타났다. 농림어업보다 숙박 및 음식업에 종사할 경우, 자영업에 만족하는 정도가 낮을수록 자영업 이탈에 대한 위험이 크게 나타났다. 이러한 결론을 바탕으로 다음과 같은 시사점을 제시하였다. 첫째, 여성 중고령 자영업자와 60대 이후에 자영업을 시작하는 고령 창업자에 대한 지원전략을 수립할 필요가 있다. 둘째, 진입장벽이 낮은 업종에서 창업하기보다 자신의 적성 및 경력을 활용하여 다양한 분야로 진출할 수 있도록 지원할 필요가 있다. 셋째, 노동환경에서 직무만족을 증진할 수 있도록 돕는 정책개발이 필요하며, 특히 고학력 자영업자에게는 자영업에 의한 다양한 보상에 만족할 수 있도록 할 필요가 있다.

• 한국철학논집
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• 제25호
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• pp.41-70
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• 2009

'자기인식'은 자신의 욕구나 감정, 관심, 가치 등을 정확하게 파악하고 자신감을 유지하는 것 등을 핵심으로 하며, '자기관리'는 스트레스를 이겨내기 위해 자신의 감정을 조절하기, 충동을 억제하기, 개인적 목표나 학업 성취 목표를 세우고 이를 잘 관리하기 등을 핵심으로 한다. 이러한 '자기인식' 및 '자기관리'에 관한 이론적 탐구는, 초등교육의 핵심 목표 중의 하나인 초등학생들의 "바르고 선한 인성"을 어떻게 하면 보다 효과적으로 함양할 것인가?의 물음에 답하기 위한 것이다. 유학적 도덕교육의 전통을 가진 우리나라의 문화적 토대를 놓고 볼 때 오랜 시간에 걸쳐 검증되고 축적된 유학의 가치덕목은 현대의 도덕교육에 있어서 분명 유용한 가치가 있을 것이며, 따라서 이를 초등 교육과정에 담거나 초등학생을 대상으로 하는 '자기 인식' 및 '자기 관리' 능력 함양을 중심으로 한 현대의 인성교육 프로그램으로 재구성하여 교육에 적극 반영하려는 노력은 의미가 있을 것이다. 이러한 점에서 도덕적 주체의 완성을 도모하는 위기지학(爲己之學)이나, 지나치거나 모자람이 없는 평상적인 삶을 추구하는 중용지도(中庸之道), 그리고 도덕적 능동성을 촉발하는 호연지기(浩然之氣)는 교육적 측면에서 전인교육을 구현하는 데 많은 기여를 할 수 있을 것이다.