• Nuclear Engineering and Technology
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• 제52권7호
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• pp.1587-1596
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• 2020

The location selection for nuclear power plants (NPP) is a strategic decision, which has significant impact operation of the plant and sustainable development of the region. Further, the ranking of the alternative locations and selection of the most suitable and efficient locations for NPPs is an important multi-criteria decision-making problem. In this paper, the non-sequential Monte Carlo probabilistic method and the Latin hypercube sampling probabilistic method are used to evaluate and select the optimal locations for NPP. These locations are identified by the power plant's onsite loads and the average of the lowest number of relay protection after the NPP's trip, based on electricity considerations. The results obtained from the proposed method indicate that in selecting the optimal location for an NPP after a power plant trip with the purpose of internal onsite loads of the power plant and the average of the lowest number of relay protection power system, on the IEEE RTS 24-bus system network given. This paper provides an effective and systematic study of the decision-making process for evaluating and selecting optimal locations for an NPP.

• Animal Systematics, Evolution and Diversity
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• 제27권2호
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• pp.151-158
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• 2011

Fish community structure in the Pyeongchanggang River was investigated from April to November 2009. About 900 individuals representing 24 species from eight families at six sites in the Pyeongchanggang River were collected. It was similar to the 2001's survey and it was less than 2006's survey. The Korean endemic species, Zacco koreanus was the most abundant, whereas subdominant species were native species, such as Pungtungia herzi, Zacco platypus, Rhynchocypris kumgangensis and Rhynchocypris oxycephalus. Three endangered species were collected at the sampling area, Acheilognathus signifier (relative abundance [RA] 0.9%), Pseudopungtungia tenuicorpa (RA 1.4%), and Cottus koreanus (RA 3.6%). One natural monument species, Hemibarbus mylodon, was included. According to the analysis of ecological indicator characteristics, the relative proportion of tolerant species was 6.3% (57 individuals), whereas the proportion of sensitive species was 65.9% (593 individuals). Species evenness, richness and diversity indices decreased gradually through the month from April to November during the study. Community indices in Pyeongchanggang River showed a high evenness index (J'>0.6), a low level of species richness (R<3.5) and a medium level of diversity (1.5

• 한국조사연구학회지:조사연구
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• 제9권1호
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• pp.43-68
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• 2008

이 연구는 생활시간 연구를 위한 두 도구를 비교한다. 시간일지와 경험표집법, 이전의 연구들이 이 두 도구가 집합적 측정치에서 유사하다는 것을 보여 왔지만, 각 도구의 개별기록의 일치율을 비교한 연구는 없었다. 이 두 도구에 모두 응답한, 시카고 대학의 알프레드 슬로안 센터에서 행해진 500가족 스터디의 일부 표본을 통하여, 이 연구는 두 도구를 비교하고 상대적 장단점을 평가하였다. 연구결과는 시간일지가 보다 덜 편향된 행동시간 측정치를 제공하는 데 반해, 경험표집법이 일상생활에 대해 보다 구체화된 서술을 가능하게 함을 시사하고 있다. 후속연구를 위한 함의가 논의되었다.

• 대한안전경영과학회지
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• 제15권2호
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• pp.243-253
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• 2013

This research paper introduces the application and implementation of medical decision metrics that classifies medical decision-making into four different metrics using statistical diagnostic tools, such as confusion matrix, normal distribution, Bayesian prediction and Receiver Operating Curve(ROC). In this study, the metrics are developed based on cross-section study, cohort study and case-control study done by systematic literature review and reformulated the structure of type I error, type II error, confidence level and power of detection. The study proposed implementation strategies for 10 quality improvement activities via 14 medical decision metrics which consider specificity and sensitivity in terms of ${\alpha}$ and ${\beta}$. Examples of ROC implication are depicted in this paper with a useful guidelines to implement a continuous quality improvement, not only in a variable acceptance sampling in Quality Control(QC) but also in a supplier grading score chart in Supplier Chain Management(SCM) quality. This research paper is the first to apply and implement medical decision-making tools as quality improvement activities. These proposed models will help quality practitioners to enhance the process and product quality level.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1995년도 가을 학술발표회 논문집
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• pp.111-121
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• 1995

교량의 내하력이나 건전도 평가에 있어서 중요한 역할을 하는 동적 매개변수들을 계측함에 있어서, 계측장치를 포함하는 적절한 계측계획 뿐만 아니라 계측된 자료를 처리하는 과정이 계측결과로부터 정확한 자료를 구하는 데 큰 영향을 미친다. 특히, 동적변위를 계측시 고정점을 확보할 수 없는 경우에는 변위계의 설치가 곤란하여 변위웅답의 계측에 어려움을 겪고 있으며, 가속도의 적분을 통해 이를 구하는 경우도 이산처리 과정에서 주요한 진동수 성분이 누락될 수 있어 실제 거동과 크게 다를 수 있다. 동적계측에서 주로 측정되는 가속도 기록에는 가속도계나 기록장비의 특성에 따라 또는 자료의 이산화 과정에서 오차들이 발생하게 된다. 계측기계의 특성에 따른 오차는 계측기 제작기술의 발달로 어느 정도 보정이 되고 있지만, 이산화 과정의 오차는 지금까지 정확한 보정을 하지 못해 가속도 기록을 이용하는 데 한계가 있었다. 따라서, 가속도 기록의 수치처리 과정에서 발생할 수 있는 오차가 언급되며, 특히 이산화 처리과정에서 표본화 주파수를 적절하게 선정할수 있는 방법을 제시한다. 제안된 방법을 이용할 경우, 동적하중에 따른 변위응답을 가속도 기록으로부터 정확하게 구할 수 있으므로, 교량 또는 동하중을 받는 대형 구조물의 건전도 평가에 크게 기여할 수 있을 것으로 사료된다.

• 전자공학회논문지C
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• 제36C권9호
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• pp.13-19
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• 1999

본 논문에서는 1mW의 낮은 전력소모를 갖는 8-bit 100KSPS CMOS A/D 변환기를 설계, 제작하였다. Cyclic 구조를 갖는 A/D 변환기에서 발생하는 연산증폭기의 시스템적인 offset 전압을 효과적으로 감소시키기 위해, 새로운 시스템적인 offset 전압 제거 기술을 제안하였다. 또한 기존 Gain 증폭기에서 발생하는 오차를 감소시키기 위해 완전 차동 구조의 Gain 증폭기를 설계하였다. 제안된 A/D 변환기는 $0.6{\mu}m$ single-poly triple-metal n-well CMOS 공정을 사용하여 제작되었으며, +3V 단일 공급전압에서 DNL과 INL은 ${\pm}1LSB$ 이내로 측정되었고, 100KHz의 샘플링 주파수에서 43dB의 SNR를 갖는다. 측정된 최대전력소모는 $980{\mu}W$로 나타났다.

• 한국조사연구학회지:조사연구
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• 제12권3호
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• pp.25-48
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• 2011

본 연구에서는 선거 출구조사에서 발생하는 편향을 분석하기 위해, 먼저 2010년 전국동시지방선거 출구조사의 표본설계와 표본추출오차, 그리고 무응답 현황 및 예측오차 등을 살펴보고, 이를 토대로 출구조사에서 체계적으로 발생하는 지역별 편향 문제를 다루었다. 출구조사에서 발생하는 편향을 통계적으로 검증하기 위해 Martin et al.(2005)이 제안한 예측 정확성 척도인 통계량 A를 사용하였다. 2010년 지방선거를 포함해 2006년 지방선거와 2007년 대통령 선거 방송사 출구조사 자료를 토대로 시 도 단위에서 지역별 편향을 분석해 본 결과, 여당 성향이 강한 지역에서는 여당 후보를 과대 추정하는 편향이 체계적으로 발생하고 있으며, 여당 성향이 강해질수록 이런 편향이 더 강해진다는 것을 확인할 수 있었다. 이런 연구결과는 향후 출구조사의 정확성 제고를 위한 방안을 모색하는 데 크게 기여할 수 있을 것으로 기대된다.

• International Journal of Human Ecology
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• 제6권2호
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• pp.73-83
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• 2005

The purpose of this study was to analyze the needs of future users for services at senior congregate housing and to look into the development directions of the service standards for senior congregate housing. A survey was conducted among middle-aged people in their fifties, who lived in Seoul, using the systematic random sampling method. The final sample included 498 respondents. The survey was conducted from November 3, 2003 to November 14, 2003. The results of this study were as follows. Firstly, as the need for housing services were high, it was quite clear that various services at senior congregate housing should be provided. Secondly, a service differentiation strategy should be proposed to meet the characteristics of the users. Thirdly, it was hereby suggested that service standards should be established in the following manner considering the relationship between the needs for services and the income level directly influencing the provision of services: 'Basic services' to be provided regardless of income, 'Optional services' to be selectable among the preferable services per income level, and 'Supportive services' to be provided for low-income people.

• 대한간호학회지
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• 제35권2호
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• pp.390-398
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• 2005

Purpose: This study was aimed at providing basic data for developing a nursing intervention program which enables systematic and correct visual acuity care by discovering out visual acuity conditions, prevalence rate of myopia, and the factors related to myopia with Preschool children. Method: The subjects of this study consisted of 519 children between 3 and 6 years of age from 12 kindergartens in Seoul which were selected through multiple cluster sampling. Myopia was defined as the spherical equivalent (SE) of more than -0.5 diopters (D) in the right eye. The data was analyzed by t-test, 2-test, ANOVA, and logistic regression by using the SAS program. Result: The prevalence rate of myopia was $8.7\%$. the odds ratio of child myopia when one parent had myopia was 2.2 times higher than when neither parent had myopia. The odds ratio of child myopia when reading more than three books per week was 0.27 times higher than reading less than three books. Conclusion: Myopia should be continuously and intensively managed from the age of 3.

• 한국조리학회지
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• 제22권1호
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• pp.96-107
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• 2016

The purposes of the study are (1) to explore relationships amongst attitudes to positive/negative tourism impacts, community satisfaction, government trust, and support for tourism development and (2) to provide practical implications for policy makers how they can gain residents' support by increasing community satisfaction and government trust, which are resulted from attitudes to tourism impacts. A questionnaire is self-administered to local residents using a systematic sampling method in Ninh Hai Commune, Hoa Lu District, Ninh Binh Province, Vietnam. The results indicate community satisfaction and government trust are core factors of support for tourism development. The study highlights that to attain community satisfaction and government trust, the policy makers should especially increase positive socio-cultural and environmental impacts and minimize negative economic impacts on the community simultaneously.