• Journal of Internet Computing and Services
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• v.15 no.3
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• pp.91-100
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• 2014

While IT security investment of organizations has been increased, the amount of the monetary loss of organizations caused by IT security breaches did not decrease as much as their expectation. Also, from surveys, it was discovered that the poor usage of their security budget thwarted the improvement of the organization's security level. In this paper, to resolve the poor usage of security budget of organizations, we propose a comprehensive economic model for determining the optimal amount of investment in security solutions, including the proactive security solutions(PSSs) and the reactive security solutions(RSSs). Using the proposed analytical model under different parameters of security solutions, we show the optimal condition to maximize the expected net benefits from IT security investment of organizations. Also, we verify the common belief that the optimal level of investment in security solutions is an increasing function of vulnerability. Through simulations, we find the optimal level of IT security investment, given parameters of different characteristics of security solutions.

• Journal of Korean Society of Disaster and Security
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• v.9 no.2
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• pp.43-52
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• 2016

Notwithstanding industrial accident decrease generally, Construction industry is on the rise recently. Most accident occurs in the small scale like as multiflex housing, remodeling, neighbourhood facility more than safety supervisor appointed large scale construction site. By the size of business place, 81.6% of total accident occurs mostly in small scale site that is bellow 120 billion won and 50 manpower. This paper aimed that small scale housing company achieve a zero hazard practising and understanding the safety adminstration standar d model easily and it applied firstly after investigating the operation condition of construction site safety control in small scale company propelling the complex style multiflex housing business.

• 한국벤처창업학회:학술대회논문집
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• 2017.04a
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• pp.25-25
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• 2017

전국에 1,000여개의 다문화 기관들이 활동 중이다. 그중 정부주도형인 여성가족부 지정 다문화가족지원센터 210여 곳을 제외한 나머지 기관들은 대부분 정부 민간 혼합형이거나 민간주도형 기관들이다. 정부주도형 기관들은 중앙정부와 지방자치단체로부터 운영비가 지원되지만 정부 민간 혼합형이나 민간주도형 기관들은 운영비를 기부금 또는 후원금에 의존한다. 그러나 경제위기의 도래로 기부금이나 후원금이 급감하는 상황에서 정부 민간 혼합형이나 민간주도형 기관들의 자립은 더욱더 어려워질 전망이다. 이러한 전망과는 달리, 지원 대상들과 다문화이슈는 지금보다 훨씬 더 늘어날 전망이다. 국내 이주민의 수는 매년 증가추세이다. 향후 2050년이 되면 전체인구의 10%가 외국인이라는 전망도 나온다. 외국인의 정주화 그리고 가족이민 증가에 따른 상이한 종교와 문화에 대한 편견 없는 이해와 대화가 강조될 것이며, 학교교육정책, 직업양성, 노동시장정책, 동등한 노동조건과 사회보장 요구, 사회적 차별에 대한 계몽정책 등 다양한 다문화 이슈도 부각될 것이다. 이처럼 다양한 분야에서 다문화 이슈를 가장 잘 다룰 수 있는 민간주도형 다문화기관의 자립 여부는 다문화 지원정책의 성패와도 연결된다고 볼 수 있다. 결국 민간주도형 다문화기관이 지금의 운영구조를 개선하고 재정적 자립을 확보하기 위해서는 다문화 관련 비즈니스모델 개발을 통해 다문화 기관들이 스스로 자립할 수 있는 사회적기업에 관심을 가질 수밖에 없다. 사천다문화통합지원센터는 비영리민간단체로 지난 13년 동안 창조적인 다문화 사업들을 추진하여 괄목할만한 성과를 거두었다. 그러나 일반 기부금이나 후원금으로 운영비를 충당하고 있는 상황에서 자립 기반 구축을 위한 비즈니스 모델 개발은 필수적이었다. 마침내 요리조리아시아 협동조합을 만들어 청소년 공정여행 프로그램인 세계로여행학교와 아열대채소 농장을 운영중에 있다. 뿐만 아니라 기업의 CSR(Corporate Social Responsibility) 해외공헌사업도 위탁받아 운영하고 있다. 본 연구에서는 사천다문화통합지원센터가 그동안 진행해 온 청소년 공정여행과 아열대채소 농장을 다문화기관의 비즈니스 모델적 측면에서 사례 분석한 후, 벤치마킹을 통해 민간주도형 다문화기관들로 확대시킴으로써 사회혁신의 기회를 증대시킬 방안을 제시하였다.

• Journal of the Korean Geographical Society
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• v.43 no.2
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• pp.202-219
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• 2008

As demand for high speed Internet service has explosively increased in the United States for the past decade, the construction or upgrades of telecommunication infrastructure has also been rapidly followed. Though currently many people in urbanized areas can be provided advanced broadband services, there are still challengeable areas to be served, such as remote or low populated areas because those areas are potentially non-profitable to commercial broadband service providers. This paper addresses the spatial disparity or in a broader term, the 'digital divide' of the broadband access by the county level in the United States. We propose the quantified measure of the county level broadband accessibility for identifying such digital divide. The developed measure is a hybrid form of the classical gravity based potential model and network topological accessibility, encouraged from the lack of prior efforts eying to explicitly incorporate the understanding of the whole process of the Internet access. The computational tasks are performed in a GIS platform, which includes several programmed functions.

• Korean Journal of Social Welfare
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• v.64 no.1
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• pp.5-30
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• 2012

This study was carried out to understand the mean of neighbourhood and community organizing model on lived experiences of their organizing and members which had changed. The methods of collecting data was progressed in depth interview. According to study questions and analysis challenges based on theory, we analyzed texts. outcome of study we understood experiences of their organizing and members which had changed. In changing phases of organizational dimension, meaning of 'the discovery of the community problem' was extracted. In this time, organization's members set the goal and experience qualitative and quantitative changes of organization. On the other hand, changing phases of individual dimension were followed, which are 'escaping from locked life', 'reconstruction of self image', 'reconstructing the meaning of both family and self-concept' as well as 'reconstructing the meaning of both neighbourhood and self-concept'. Conclusively, we suggested practical implication, which might increase the effect of neighbourhood and community organizing model.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.6
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• pp.287-293
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• 2013

Cochlear implant (CI) is an auditory prosthesis that delivers electrical stimulation via inserted electrodes into a cochlea. To evaluate CI performance, it is important to understand how auditory nerves are responded to electrical stimulations. In clinic, electrically evoked compound action potential (ECAP) is measured. In this study, we developed 3D finite element (FE) cochlear model to simulate ECAP in response to electrical stimulation. The model prododuced ECAP similar to that measured in animal experiments and clinics. This 3D FE cochlear model could be used in electrical stimulus method study to improve CI by analyzing neural responses to electrical stimulations.

• Journal of Elementary Mathematics Education in Korea
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• v.3 no.1
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• pp.75-92
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• 1999

Many educators say that one of the key theory which is widely accepted teaching-learning process in the 7th mathematics curriculum is constructivism. They believe constructivism is very powerful as a background theory in teaching-learning mathematics and in this point of view, each student can construct knowledge by himself in the inner world. Therefore, the aspect of teaching-learning methods in the 7th mathematics curriculum focused on inquiry learning, self-directed learning, cooperative learning. Through this methods, the 7th mathematics text also composed of ease, interesting and dynamic activity oriented subjects. And constructive teaching-learning methods in mathematics is implemented variously by those whom attracted in constructivism. Thus, the purpose of this study is to build up a model that is required to systematize teaching-learning process in mathematics as a guideline for teachers. Another purpose of this study is to make clear that the presented model is appropriate process for teaching-learning in mathematics.

• Communications of Mathematical Education
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• v.33 no.4
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• pp.445-453
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• 2019

Gender might be interpreted in different roles and meanings depending on social and cultural backgrounds. Based on the premise that understanding of gender may change the direction of mathematics education, this paper confirmed how gender is interpreted in the preceding study of mathematics education in Korea by applying the literature research method. In particular, predictive model based on empirical perspective and gender schema model based on constructivist perspective. Based on the analysis of gender and research methods in cultural and historical composition models based on historical perspectives and postmodernism models based on postmodernism perspectives, this study analyzed trends in domestic mathematics education. As a result of the analysis, it is confirmed that gender is recognized as a biological difference in domestic mathematics education, and that analysis of gender and related elements of mathematics education is mainly used using statistical analysis techniques. This suggests that various approaches to interpreting gender's role in future mathematics education are needed. The existing mathematics education research on gender is composed in terms of gender differences. Since biology at the time did not explain this difference, however, it should now be based on the concept of gender, which is socially defined gender. Accurate understanding of gender and gender can be the basis for clearer understanding and interpretation of gender-related mathematics research.

• Journal of the Korea Concrete Institute
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• v.13 no.5
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• pp.447-456
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• 2001

Many investigators have tried to represent the nonlinear behavior of stress-strain relationship of concrete using mathematical curves. Most of empirical expressions for stress-strain relationship, however, have focused on old age concrete, and were not able to represent well the behavior of concrete at an early age. Where wide understanding on the behavior of concrete from early age to old age is very important in evaluating the durability and service life of concrete structures. In this paper, effect of 5 different strength levels and ages of from 12 hours to 28 days on compressive stress-strain relationship was observed experimentally and analytically. Tests were carried out on $\phi$100${\times}$200mm cylindrical specimens water-cured at 20${\pm}$3$^{\circ}C$. An analytical expression of stress-stain relationship with strength and age was developed using regression analyses on experimental results. For the verification of the proposed model, the model was compared with present and existing experimental data and some existing models. The analysis shows that the proposed model predicts well experimental data and describes well effect of strength and age on stress-strain relationship.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.39 no.12
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• pp.953-963
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• 2015

There is an increasing need to understand the thermal-hydraulic phenomena, including the critical heat flux (CHF), in narrow rectangular channels and consider these in system design. The CHF mechanism under a saturated flow boiling condition involves the depletion of the liquid film of an annular flow. To predict this type of CHF, the previous representative liquid film dryout models (LFD models) were studied, and their shortcomings were reviewed, including the assumption that void fraction or quality is constant at the boundary condition for the onset of annular flow (OAF). A new LFD model was proposed based on the recent constitutive correlations for the droplet deposition rate and entrainment rate. In addition, this LFD model was applied to predict the CHF in vertical narrow rectangular channels that were uniformly heated. The predicted CHF showed good agreement with 284 pieces of experimental data, with a mean absolute error of 18. 1 % and root mean square error of 22.9 %.