• 한국생물환경조절학회:학술대회논문집
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• 한국생물환경조절학회 2006년도 춘계 학술대회 및 정기총회
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• pp.120-124
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• 2006

• ALGAE
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• 제33권2호
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• pp.191-203
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• 2018

Fragilariopsis cylindrus is one of the most successful psychrophiles in the Southern Ocean. To investigate the molecular mechanism of biomineralization in this species, we attempted to synchronize F. cylindrus growth, since new cell wall formation is tightly coupled to the cell division process. Nutrient limitation analysis showed that F. cylindrus cultures rapidly stopped growing when deprived of silicate or light, while growth continued to a certain extent in the absence of nitrate. Flow cytometry analysis indicated that deprivation of either silicate or light could effectively arrest the cell cycle of this diatom species at the G1 phase, suggesting that synchrony can be established using either factor. Fluorescence labeling of new cell walls was faintly detectable as early as approximately 6 h after silicon repletion or light irradiation, and labeling was markedly intensified by 18 h. It is revealed that the synthesis of girdle bands begins before valve synthesis in this species, with active valve synthesis occurring during the G2 / M phase. Expression profiling revealed that selective member(s) of the F. cylindrus SIT genes (FcSIT) respond to silicate and light, with a different set of genes being responsive to each factor. The Si / light double depletion experiments demonstrated that expression of one FcSIT gene is possibly correlated to transition to G2 / M phase of the cell cycle, when the valve is actively formed.

• 정보처리학회논문지D
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• 제18D권6호
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• pp.493-500
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• 2011

기술용어 트렌드는 특정 연구 분야의 세부적인 주제가 시간의 흐름에 따라 변화하는 양상을 표현한다. 그런데 학술 문헌이나 특허의 경우에는 그 데이터가 방대하여 인적 자원을 활용하여 트렌드를 분석하는 것이 용이하지 않다. 본 논문은 용어의 활용주기를 모델링하고, 이를 통해 학술 논문에 나타나는 기술용어 트렌드를 탐지하고 분석할 수 있는 방법을 제안한다. 제안된 기법은 다음과 같은 과정으로 구성된다. 먼저 논문 데이터에서 추출된 기술용어를 대상으로 일정 주기별 용어지배값을 측정한다. 용어지배값 획득되면 이를 기반으로 용어 활용주기를 모델링한다. 이 모델링 과정에서 활용주기의 시계열 패턴이 유사한 기술용어들은 동일 트렌드 범주로 분류한다. 본 논문의 기술용어 트렌드 분석 실험을 위해 한국과학기술정보연구원이 운영 중인 국가과학기술정보센터(NDSL) 학술 논문 데이터를 활용하였다.

• 가정과삶의질연구
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• 제34권3호
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• pp.147-163
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• 2016

Multicultural Family Support Centers (MFSC) have provided five program areas including family, gender equality, human rights, social integration, and counseling since 2015. It is important to examine the MFSC staff's perceptions of the family programs and program needs for multicultural families to improve the effectiveness of these programs. In this study, we aim to explore the staff's perceptions of the family programs and to assess multicultural family program needs based on the family life cycle. A total of 130 MFSC staff were recruited through 128 MFSCs across Korea. Descriptive statistics were conducted for data analysis. Our findings revealed that MFSC staff have increasingly recognized that their target audiences are not only marriage immigrants and their families but also foreign workers' families and families from North Korea. In addition, the MFSC staff identified the importance of family programs instead of only programs for individual family members and multicultural families' different program needs based on their family life cycle. Contrary to the positive perception of the family programs, they described challenges of the family programs including a shortage of funds, difficulty recruiting family member combinations (e.g., couples, parent-child) for family programs, a lack of a program manual, and a heavy workload. This study provides insights into the family programs including their development and delivery.

• 한국철도학회논문집
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• 제12권1호
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• pp.88-94
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• 2009

철도시스템의 경우에는 구성 시스템이 복잡할 뿐만 아니라 25년 이상 오랜 시간 사용으로 인해 유지보수 활동이 많으며 이에 소요되는 비용 또한 많다. 따라서 철도시스템의 LCC 계산에 있어 얼마나 정확하게 유지보수 비용을 계산하느냐가 관건이라 해도 과언이 아니다. 따라서 본 연구에서는 철도시스템 LCC 모델링 개발의 일환으로 철도차량의 정확한 유지보수 비용을 계산하기 위하여, 규격과 가이드 등 관련 자료의 분석을 통하여 철도차량에 적합한 예방정비와 보수정비에 관련된 유지보수정보 템플릿의 개발 연구를 수행하였으며, 이렇게 제안된 유지보수정보 DB 템플릿에 대한 검증을 위하여, 철도시스템 부품에 대한 전주기 유지보수비용을 계산하였다.

• 대한간호학회지
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• 제29권3호
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• pp.700-710
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• 1999

Promoting women's health lifestyles are important due to their connection to family health. The purpose of this study was to analyse women's health lifestyles(HPL) and their effects on women's life-cycle, so in order to develop a program in a women's health care center. The subjects included were 1080 women over 18 years old living in Wonju city, and were selected by stratified and purposive sampling. The data were collected through a questionnaire and interview. The Cronbach $\alpha$, %, mean, ANOVA, Pearson's correlation, and regression in SPSS PC Win. package was used to analyze the data. The sample was sepernted into three groups premarital group 20.2%(premarital women between 18 and 40 years old), delivery and children rearing group 49.9%(marital women between 18 and 40 years old), over middle agedelderly group 29.9%(women over 41 years old). Significant difference were found in the HPL according to group. Also, relating variables, such as self-efficacy, family functions, health locus of control and gender role perception that were considered relating variables to HPL significantly differed among the three groups. HPL significantly correlated with self-efficacy, family functions, HLOC and gender role perception in all participants and at all groups. The regression analysis of HPL was interpreted 40.6% with relating variables, self-efficacy, health attention, family functions, and internal locus of control, health perception, power other locus of control and chance locus of control in all participant. Self-efficacy, family functions, health attention were considered important variables in premarital group, self-efficacy, family functions, internal locus of control, health attention, health perception and power of control were important in delivery-rearing group. Self-efficacy, health attention, internal locus of control, family functions and health perception were important in middle aged-elderly group. As a result, we found the differences HPL scores and relating variables according to life-cycle groups. Therefore, we should prepare health promoting education programs for women according to women's life cycles. Also we suggest that women's health care centers based on communities was needed for proper management of women's health.

• 지역연구
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• 제40권3호
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• pp.75-93
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• 2024

이 연구는 개인의 생애주기별 기회의 지역 간 격차와 삶의 성과의 관계를 규명하기 위해 '기회가 풍부한 곳'으로의 이동이 개인의 임금 소득에 미치는 영향을 살펴보았다. 한국고용정보원에서 제공하는 '대졸자 직업이동 경로조사(GOMS, Graduate Occupational Mobility Survey)'를 기반으로 성향점수매칭(PSM, Propensity Score Matching) 방법을 활용하여 지역 이동 이전의 삶의 경험이 유사한 개인을 선별하여 분석하였다. 구체적으로는 생애주기를 고등학교 진학 이전, 대학교 진학 시기, 취업 시기 등으로 분류한 후, 생애주기별 지역 이동과 진학, 취업, 임금 소득 간 경로 모형을 설정하여 분석하였다. 분석 결과, 지역 이동이 개인의 경제적 성과에 가장 큰 영향을 미치는 생애주기, 즉 기회 차이에 따른 영향이 가장 불평등하게 나타나는 생애주기는 대학 진학 시기로 나타났다. 그리고 기회가 풍부한 곳으로의 이동은 이후의 삶에 누적적으로 영향을 미치는 중요한 요소로 밝혀졌다. 이에 따라 고등학교 입학 이전 시기의 이동성 또한 이후 중심부에서의 삶을 유발한다는 점에서 주목할 만하다. 마지막으로, 부모의 소득은 그 자체로도 영향력이 있지만, 지역 이동과 결합하여 자녀 세대에게 부를 이전하는 수단으로 작용할 수 있음을 발견하였다. 이러한 결과는 국가가 비수도권 대학 육성을 통해 대학 중심의 불균형을 해소하고, 부모의 사회경제적 배경에 따른 지역 이동의 제약을 줄이기 위해 노력해야 함을 시사한다.

• 한국도로학회논문집
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• 제18권4호
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• pp.19-28
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• 2016

PURPOSES : Long-life asphalt pavements are used widely in developed countries. In order to be able to devise an effective maintenance strategy for such pavements, in this study, we evaluated the performance of the long-life asphalt pavements constructed along the national highways in South Korea. Further, an economic evaluation of the long-life asphalt pavements was performed based on a life-cycle cost analysis. We aimed to devise a model for evaluating the performance of long-life asphalt pavements using the national highway pavement management system (PMS) database as well as for analyzing the economic feasibility of such pavements, in order to promote their use in South Korea. METHODS : The maintenance history and pavement performance data were obtained from the national highway PMS database. The pavement performances for a total of 292 sections of 10 lanes (5 northbound lanes and 5 eastbound lanes) of national highways were used in this study. Models to predict the performances of hot mix asphalt (HMA) and long-life asphalt pavements under two distinct traffic conditions were developed using a simple regression method. Further, the economic feasibility of long-life asphalt pavements was evaluated using the Korea Pavement Management System (KoPMS). RESULTS : We developed service-life prediction models based on the traffic volume and the equivalent of single-axle load and found that long-life asphalt pavements have service lives 50% longer than those of HMA pavements. Further, the results of the economic analysis showed that long-life asphalt pavements are superior in terms of various economic indexes, including user cost, delay cost, total cost, and user benefits, even though their maintenance cost is higher than that of HMA pavements. A comparison of the economic feasibilities of the various groups showed that group A is superior to HMA pavements in all aspects except in terms of the maintenance criterion (crack 20% or higher) as per the NPV index. However, the long-life asphalt pavements in group B were superior in terms of the maintenance criterion (crack 25% or higher) regardless of the economic feasibility. CONCLUSIONS : The service life of long-life asphalt pavements was found to be approximately 50% longer than that of HMA pavements, regardless of the traffic volume characteristics. The economic feasibility of long-life asphalt pavements was evaluated based on the KoPMS. The results of the economic analysis were the following: long-life asphalt pavements are exceptional in terms of almost all factors, such as user cost, delay cost, total cost, and user benefit; however, the exception is the maintenance cost. Further, the economic feasibility of the long-life asphalt pavements in group B was found to be better than that of the HMA pavements (crack 25% or higher).

• Membrane and Water Treatment
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• 제8권2호
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• pp.137-147
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• 2017

A water treatment utility in South Korea operates a large system of pressurized hollow fiber membrane (PHFM) modules. The optimal selection of membrane module for the full scale plant was critical issue and carried out using Risk-based Life Cycle Cost (RbLCC) analysis based on the historical data of operation and maintenance. The RbLCC analysis was used in the process of decision-making for replacing aged modules. The initial purchasing cost and the value at risk during operation were considered together. The failure of modules occurs stochastically depending on the physical deterioration with usage over time. The life span of module was used as a factor for the failure of Poisson's probability model, which was used to obtain the probability of failure during the operation. The RbLCC was calculated by combining the initial cost and the value at risk without its warranty term. Additionally, the properties of membrane were considered to select the optimum product. Results showed that the module's life span in the system was ten years (120 month) with safety factor. The optimum product was selected from six candidates membrane for a full scale water treatment facility. This method could be used to make the optimum and rational decision for the operation of membrane water purification facility.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2003년도 학술대회지
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• pp.465-468
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• 2003

전 세계적으로 지구온난화현상, 수질오염 등의 환경문제에 대한 관심이 높아지고 있다. 이러한 환경문제에 대한 인식으로 환경유해요소들에 대한 활발한 연구로 선진국에서는 이미 법적인 제도를 마련하는 등 환경보존 및 유해요소 저감방안에 대한 연구가 진행되고 있다. 건설산업 분야에서도 환경친화성에 대한 정량적 자료로 LCA분석 내용을 제시하도록 ISO에서 규정하고 있다. 국내건설업의 경우 LCA 기법에 대한 연구가 국가적 차원에서 진행되고 있다. 본 연구에서는 LCA분석을 통하여 계획안에 대한 타당성을 확인하고자 하였다. 자재생산단계, 시공단계, 유지관리단계, 폐기처분단계에 대하여 환경영향비용을 고려한 생애주기비용 통합분석결과, 계획안 74,819,560,776원, 대안 78,979,469,602원으로 계획안이 대안에 비해 4.159,908,826원이 절감되는 것으로 분석되었다.