• ETRI Journal
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• 제32권1호
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• pp.102-111
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• 2010

Recently power attacks on RSA cryptosystems have been widely investigated, and various countermeasures have been proposed. One of the most efficient and secure countermeasures is the message blinding method, which includes the RSA derivative of the binary-with-random-initial-point algorithm on elliptical curve cryptosystems. It is known to be secure against first-order differential power analysis (DPA); however, it is susceptible to second-order DPA. Although second-order DPA gives some solutions for defeating message blinding methods, this kind of attack still has the practical difficulty of how to find the points of interest, that is, the exact moments when intermediate values are being manipulated. In this paper, we propose a practical second-order correlation power analysis (SOCPA). Our attack can easily find points of interest in a power trace and find the private key with a small number of power traces. We also propose an efficient countermeasure which is secure against the proposed SOCPA as well as existing power attacks.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2005년도 추계학술대회 논문집
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• pp.89-92
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• 2005

The purpose of this study was to clarify the space use pattern and the daily living activities of the elderly with dementia in the common space (living room) of nursing home. The subjects were 2 units(living room) of the nursing home. For this, researcher visited from June 20 to July 2 and collected data by observations of behavior of the elderly with dementia in common space(living room) and interviews with staff for the information about basic characteristics of the elderly with dementia and administration and operation of the facilities. The data were analyzed using the frequency and percentage. The results revealed as follows: first, the daily living activities of the elderly with dementia in common space tended to focus on self-concentration type and physical environment-interest type. Second, physical environmental -interest type. Second, physical environmental characteristics of common space affected space usage pattern of the elderly with dementia. And it was perceived like as living oriented space, social interaction space, facility space, staff oriented space. Conclusively it was suggested to plan dining space as semi-private space, day corner as semi-public space.

• 대한건축학회논문집:구조계
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• 제35권6호
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• pp.147-152
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• 2019

The purpose of this study is to derive priority improvement items through business expansion and efficient implementation for green remodeling business operator in order to enhance the activating of green remodeling business in a long-term perspective. For this purpose, survey of 128 business operator respondent is conducted based on 13 items. Also, priority improvements items were derived based on the results of the survey by using IPA(Importance Performance Analysis) techniques. As a result, In order to revitalize the green remodeling, it is necessary to induce market participation motivation through monetary profit. Additionally, The management of green remodeling business operator and the opinions of owners should be reviewed. In the future, the items that reflect the views of business operator and owners will be investigated and further research on improvements for expanding green remodeling 'interest subsidies on existing private buildings will be conducted.

• 국제지역연구
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• 제20권1호
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• pp.167-181
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• 2016

한국경제에 있어서 운수통신 서비스 산업은 공공운수 등 공공부문과 민간부문이 동시에 공존하고 있다. 공공부문은 일반적으로 가격규제의 대상이 되며 적정수준의 정상이윤이 보장된다. 본 논문은 생산요소가격으로 구성된 마크업방정식을 설정하고 운수통신산업의 시계열 마크업을 추정하였다. 또한 자기회귀 시차모형을 이용하여 마크업의 생산요소가격 탄력성을 추정하고 마크업의 결정요소를 분석하였다. 실증분석결과, 마크업의 임금탄력도는 -0.07, 수입가격 탄력도는 -0.45 그리고 이자율탄력도는 -0.13으로 추정되었다. 따라서 본 논문은 운수통신산업의 규제정책에 있어서 수입가격과 이자율이 고려되어야 할 주요 변수임을 밝히고 있다.

• 산경연구논집
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• 제13권2호
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• pp.45-57
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• 2022

Purpose: This paper examines whether or not universal banking operating in the asset management business tend to IPO underpricing when they are hosting IPOs in favor of their private interests. Previous studies suggest evidence which indicates that the universal banking operating in the asset management business tend to underestimate offering prices. This paper compares and analyzes the data before and after June 2007 to examine the influence of put-back option on IPO underpricing. Research design, data, and methodology: This paper compares the underwritten prices of IPOs of universal banking with and without asset management business in Korea in order to test such tendency actually exists. Result: We can find that such tendency is not correlated with first-day stock returns but correlated with put-back options. Our paper concludes that the hypothesis that "the universal banking's subsidiary asset management business influences the IPO underpricing" is found to be statistically insignificant. Conclusion: According to our analysis, it cannot be concluded that the interests of operating asset management do not conflict with the ones of underwriting business. However, it is so possible that the asset management companies try to harm the customers' interests, for instances churning and stuffing, it is necessary to scrutinize their behaviors and review the related regulations.

• 시스템엔지니어링학술지
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• 제12권1호
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• pp.73-87
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• 2016

Combining power generation and water production by desalination is economically advantageous. Most desalination projects use fossil fuels as an energy source, and thus contribute to increased levels of greenhouse gases. Environmental concerns have spurred researchers to find new sources of energy for desalination plants. The coupling of nuclear power production with desalination is one of the best options to achieve growth with lower environmental impact. In this paper, we will per-form a sensitivity study of coupling nuclear power to various combinations of desalination technology: {1} thermal (MSF [Multi-Stage Flashing], MED [Multi-Effect Distillation], and MED-TVC [Multi-Effect Distillation with Thermal Vapour Compression]); {2} membrane RO [Reverse Osmosis]; and {3} hybrid (MSF-RO [Multi-Stage Flashing & Reverse Osmosis] and MED-RO [Multi-Effect Distillation & Reverse Osmosis]). The Korean designed reactor plant, the APR1400 will be modeled as the energy production facility. The economical evaluation will then be executed using the computer program DEEP (Desalination Economic Evaluation Program) as developed by the IAEA. The program has capabilities to model several types of nuclear and fossil power plants, nuclear and fossil heat sources, and thermal distillation and membrane desalination technologies. The output of DEEP includes levelized water and power costs, breakdowns of cost components, energy consumption, and net saleable power for any selected option. In this study, we will examine the APR1400 coupled with a desalination power plant in the Kingdom of Saudi Arabia (KSA) as a prototypical example. The KSA currently has approximately 20% of the installed worldwide capacity for seawater desalination. Utilities such as power and water are constructed and run by the government. Per state practice, economic evaluation for these utilities do not consider or apply interest or carrying cost. Therefore, in this paper the evaluation results will be based on two scenarios. The first one assumes the water utility is under direct government control and in this case the interest and discount rate will be set to zero. The second scenario will assume that the water utility is controlled by a private enterprise and in this case we will consider different values of interest and discount rates (4%, 8%, & 12%).

• 한국실내디자인학회논문집
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• 제13권6호
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• pp.184-195
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• 2004

The purpose of this study was to clarify the space use pattern and the daily living activities of the elderly with dementia in the common space (dining room, day corner) of nursing home in Japan. The subjects were six units of the 2 nursing homes in Tokyo. For this, researcher visited from September 5 to December 5 and collected data by observations of behavior of the elderly with dementia in common space and interviews with staff for the information about basic characteristics of the elderly with dementia and administration and operation of the facilities. The data were analyzed using the frequency and percentage with SPSS 11 program and recorded in the form of behavior map. The results revealed as follows: first, 6 types (self-concentration type, physical environment-interest type, passive others-interest type, staffs-interaction type, other elderly-interaction type, visitors-interaction type) of the daily living activities of the elderly with dementia in common space were founded. Second, the daily living activities of the elderly with dementia in common space tended to focus on self-concentration type and physical environment-interest type. Third, physical environmental characteristics of common space affected space usage pattern of the elderly with dementia. And it was perceived like as living oriented space, social interaction space, facility space, staff oriented space. Conclusively it was suggested to plan dining space as semi-private space, day comer as semi-public space.

• Human Ecology Research
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• 제58권4호
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• pp.585-599
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• 2020

This study investigated children's interests in learning English, affected by educational activities in and out of institutes, and mothers' perceptions regarding early childhood English education. We recruited, 253 mothers of 3- to 5-year-old children in either general kindergartens or English immersion institutes. They answered questions on socioeconomic status, perceived interest in English by their children, their perceptions regarding early childhood English education, and English education outside institutes. In addition, 42 English teachers provided information within institutes such as class time per week, teacher-pupil rate, and language use policy during class. The collected data were analyzed through SPSS 22 for frequency analysis, descriptive statistics, independent t-test, and hierarchical multiple regression analysis. The major findings are as follows. First, the two groups were in distinct learning environment. Second, mothers' perceptions and outside-institute activities were significantly different between the two groups. Third, the English interests of children at both institutes were influenced by mothers' worries and at-home English interactions. Fourth, education within institutes did not affect both group's English interests. Fifth, private education and socioeconomic status did not affect both group's English interests. Lastly, only the children's interests in English immersion institutes were affected by gender and mother's perceived necessities. Focusing children's interests, this study helps in understanding young children's affective aspects regarding learning English. The findings are expected to be a guideline for each home and institute to increase children's interest in learning English.

• 국제지역연구
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• 제22권2호
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• pp.93-119
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• 2018

2004년부터 2013년까지 계속된 중국의 자동차 소비자 보호 정책 수립과정에서 소비자, 제조 업체, 판매 대리상, 수리업체 사이에 이익 표출과 이익집약이 반영되었다. 특히 중국소비자협회의 노력과 수정 안건 제시로 분산된 소비자들의 이익이 표출되는데 성공했다. 그리고 판매 업체들은 중국 자동차 유통협회를 통해 자동차 제조업체에 책임을 추궁할 수 있는 권리를 최종 규정에 넣었다. 마지막으로 자동차 업체들의 적극적인 이익 표출로 인해 정책 수립이 지연되기도 하고 소비자들에게 이익이 되는 정책을 촉진시키기도 하였다. 따라서 중국의 자동차 소비자 보호 정책 수립과정을 통해 본 중국의 국가-사회관계는 단순히 국가조합주의로 환원시키기에는 한계가 있고, 사회조합주의와 같은 상향식 이익 표출과 정책수정 활동 역시 중요하다는 것을 알 수 있다.

• 한국융합학회논문지
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• 제13권4호
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• pp.155-161
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• 2022

코로나19의 확산으로 '가상관광'이 주목받고 있다. 포털 뉴스를 대상으로 '가상관광'을 키워드로 검색하여 데이터 마이닝 기법인 로그오즈비 분석, 명사 빈도분석, 의미망 분석을 통해 추이와 방향성을 고찰하였다. 그 결과, 코로나19 이전부터 '체험'과 '기술'기반의 '가상관광'에 주목하고 있었으며, '콘텐츠의 다양성 확보'에서 코로나19 이후 '지역 경제의 회복을 위한 사업'으로 바뀌었다는 점과 '온라인' 기반의 '상호작용'이 가능한 '가상현실' '확장현실' 등의 정보통신기술 의존성이 커졌다는 점을 명확히 할 수 있었다. 메타버스 등 '가상공간'에 대한 수요가 확대되고 있으므로 정부는 조사결과에 기초한 지원계획과 정책을 수립하고, 지자체와 기업은 AISAS(Attension, Interest, Search, Action, Share)에 주목하여 차별적 콘텐츠를 기획·제작하며, 대학과 연구기관은 콘텐츠에 맞는 기술을 개발하여 적용, 평가, 실용화함으로써 경제적, 체계적, 순환적 구조가 이루어질 수 있도록 해야 한다.