• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.291-296
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• 2008

지난 20년간 3D/4D CAD에 관한 연구는 시설물 생애주기의 설계, 시공단계를 중심으로 활발히 진행되어 왔지만 시설물 생애주기 전반에 걸쳐서 3D/4D CAD의 유용성에 관한 연구는 아직까지 미흡한 실정이다. 본 연구에서는 설계, 시공단계에 국한하지 않고 시설물 생애주기 동안의 3D/4D CAD 사용에 따른 유용성을 도출하기 위하여 현재 상용화된 소프트웨어를 사용하여 3D/4D CAD 모델을 생성하였다. 생성된 모델과 기존의 시설물 생애주기 관리 방법을 기반으로 전문가와 포커스 그룹 인터뷰를 실시하여 그 결과를 바탕으로 155명의 시설물 생애주기 관련 업무 수행자들의 설문조사를 통해 3D/4D CAD를 통한 시설물 생애주기 관리 유용성을 도출하였다.

• Journal of Computing Science and Engineering
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• 제7권2호
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• pp.81-88
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• 2013

In cognitive radio or dynamic spectrum access networks, a rendezvous represents meeting two or more users on a common channel, and negotiating to establish data communication. The rendezvous problem is one of the most challenging tasks in cognitive radio ad hoc networks. Generally, this problem is simplified by using two well-known mechanisms: the first uses a predefined common control channel, while the second employs a channel hopping procedure. Yet, these two mechanisms form a life cycle, when they simplify the rendezvous problem in cognitive radio networks. The main purpose of this paper is to point out how and why this cycle forms.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.147-148
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• 2011

This study applied BIM(Building Information Modeling) technology for Long-life Housing within exterior, interior and building equipment. There has many changes and depression infill material after construction. Therefore to understand establishment of repair and replacement cycle is necessity. In addition, the method of classification is necessary because of construction equipment efficiency. On this study, we will find how can we manage them and establish the repair and repairment cycle by applying BIM technology.

• Journal of Sport and Applied Science
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• 제2권1호
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• pp.25-38
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• 2018

One of the largest and fastest growing segments of the tourism industry, sport tourism refers to travel to play sports, watch sports, or to visit a sport attraction including both competitive and non-competitive activities. In this respect, cycling can be considered as not only a form of physical exercise but also a form of tourism in which cycling is a usual tourism-related activity, heading to a particular destination. The purpose of this study is to examine how demographical differences of cycle tourists are related to the quality of their life. An online survey was conducted and data was analyzed using frequency, reliability, and one - way ANOVA using SPSS 22.0. First, we found that there was no significant difference on the quality of physical life based on demographical characteristics. Second, the analysis of the relationship between demographical characteristics and the quality of mental life showed that income level affects their quality of mental life. Third, the analysis of the relationship between socio demographic characteristics and the quality of social life showed that marital status affects the quality of social life. Fourth, no statistically significant difference was found between the demographical characteristics and the quality of environmental life. Further implications were discussed.

• Journal of Advanced Marine Engineering and Technology
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• 제40권7호
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• pp.593-598
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• 2016

LNG 선박용 성형 벨로우즈의 성형방법에 따른 특성을 파악하기 위하여 정적시험과 저주기 피로시험을 실시하였다. 벨로우즈의 규정된 수명 사이클인 8,000회를 실시하여 시험전후의 벨로우즈의 각 산에 걸리는 변형률과 응력을 측정하여 성형방법에 따른 벨로우즈간의 차이를 분석하고 산 별 응력분포를 살펴보았다. 본 저주기 피로시험은 x-y방향의 변위가 가능한 유압시스템의 구조시험장비에 성형 벨로우즈를 장착하고 벨로우즈의 각 산에는 스트레인게이지를 장착하고 멀티레코더를 통하여 데이터를 처리하였다. 이를 통하여 벨로우즈가 성형방법에 따른 수명의 차이가 있는지 살펴보았고, 성형방법에 따른 수명의 차이를 주는 원인을 분석하였다.

• Molecules and Cells
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• 제28권1호
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• pp.37-42
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• 2009

Iron binding lactoferrin (Lf) is involved in the control of cell cycle progression. However, the molecular basis underlying the effects of Lf on cell cycle control, as well as its target genes, remains incompletely understood. In this study, we have demonstrated that a relatively low level of ironsaturated Lf, Lf($Fe^{3+}$), can stimulate S phase cell cycle entry, and requires Akt activation in MCF-7 cells. Lf($Fe^{3+}$) immediately induced Akt phosphorylation at Ser473, which subsequently induced the phosphorylation of two G1-checkpoint Cdk inhibitors, $p21^{Cip/WAF1}$ and $p27^{kip1}$. The Lf($Fe^{3+}$)-induced phosphorylation of Cdk inhibitors impaired their nuclear import behavior, thereby inducing cell cycle progression. However, the treatment of cells with a PI3K inhibitor, LY294002, almost completely blocked Lf($Fe^{3+}$)-stimulated cell cycle progression. LY294002 treatment abrogated Lf($Fe^{3+}$)-induced Akt activation, and prevented the cytoplasmic localization of $p27^{kip1}$. Higher levels of $p21^{Cip/WAF1}$ were also detected in the cytoplasmic sub-cellular compartment as a measure of cellular response to Lf($Fe^{3+}$). Consequently, the degree of phosphorylation of retinoblastoma protein was enhanced in response to Lf($Fe^{3+}$). Therefore, we conclude that Lf($Fe^{3+}$), as a potential antagonist of Cdk inhibitors, can facilitate the functions of E2F during progression to S phase via the Akt signaling pathway.

• 한국산림과학회지
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• 제104권2호
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• pp.285-293
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• 2015

본 연구는 한국의 '생애주기별 산림복지' 시설사례들에 대한 연구를 통해 국내 산림복지시설의 특성을 분석하고, 이를 바탕으로 우리나라 산림복지 정책에 적용시킬 수 있는 시사점을 도출하기 위해 수행되었다. 이를 위해, 여러 가지로 산재해 있는 생애주기별 산림복지 시설사례들의 통계자료들을 하나로 통합하여 분석하였다. 우리나라 생애주기별 산림복지 시설의 특성에 대해서 살펴보면 첫째, 각 생애 주기에 해당하는 산림복지 시설들 간의 양적인 불균형이 나타나고 있다. 둘째, 생활권 주변 숲에 위치한 시설이 부족하다. 셋째, 시설들이 대부분 국공유림에 위치하고 있다. 그리고 이러한 특성을 바탕으로 다음과 같이 관련정책에 적용시킬 수 있는 제언을 할 수 있다. 첫째, 각 생애주기의 수요에 맞게 필요한 시설들을 골고루 설치할 필요가 있다. 둘째, 좀 더 생활권에 가까운 곳에 산림복지 시설을 만들어 접근성을 높일 필요가 있다. 셋째, 우리나라는 산림의 대부분이 사유림으로 구성되어 있다. 이러한 현재의 상황은 더 많은 국토를 고르게 활용하여 국민에게 산림복지의 혜택을 제공할 경우보다는 불리한 측면이 있다고 할 수 있다. 따라서 민간자본의 도입을 확대하고 사유림을 활성화시켜, 더 많은 사람들에게 산림복지의 혜택을 제공하고 국 공유 및 사유림 산림복지시설의 양적인 균형을 맞추기에 유리한 조건을 형성 필요가 있다.

• 한국전산구조공학회논문집
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• 제26권6호
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• pp.415-421
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• 2013

본 논문에서는 면진시스템이 원전에 적용될 경우 원전구조물의 생애주기 성능에 미치는 영향을 소개한다. 최근 내진설계와 더불어 강진발생 예상 지역에 적용을 목적으로 개발되는 면진시스템은 구조물을 장주기화하여 응답가속도를 줄이고 상대변위를 늘려줌으로써 구조물의 안전성을 증진시키는 것으로 알려져 있다. 따라서, 구조물의 안전성이 중요시되는 원전구조물에 면진시스템을 적용하기 위한 연구가 국내에서 진행 중에 있다. 본 연구에서는 원전구조물의 생애주기 성능분석에 있어서 특징을 분석하고, 면진시스템이 적용될 경우 원전구조물의 생애주기성능에 있어서 미치는 영향을 평가함으로써, 도출된 결과를 면진시스템 적용의 정량적인 타당성 평가에 활용할 수 있다.

• 가정과삶의질연구
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• 제4권2호
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• pp.35-51
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• 1986

The purpose of this study is to establish family life cycle of farm and to analyze changes of economic conditions-income, consumption expenditures, savings, assets, and debts-in farm household according to the family life cycle. Income, consumption expenditures, savings, assets, and debts functions are also estimated by age of household head. The data of Farm Household Economy Survey which was conducted in 1983 by Ministry of Agriculture and Fisheries is used in this study. Among total data of 2000, 1603 are analyzed for mean, percentage, and regression using CRISP Program at Office of Rural Development. The results of study can be summarized as follows; 1) Eight stages of family life cycle of farm are established according to the growth of the first child. They are: Establishment stage, Child bearing and preschool stage, Elementary school stage, Middle and high school stage, College and vocational adjustment stage, Period of children's marriage, Re-adjustment stage, and isorganizing stage. 2) The economic conditions of farm household are significantly fluctuated by family life cycle. Among the eight stages, stage Ⅱ is considered relatively comfortable living period and stage Ⅲ, Ⅳ are the most difficult periods of farm household economy. 3) The estimated functions of income, consumption expenditures, savings, assets, and debts by age of household head are as follows; Y(income) = 2, 354, 832+98,456T-1,036T2(F=11.746) C(consumption expenditures) = 81,876+154,976T-1,552T2 (F=37.272) S(savings) = 2,272,956+56,511T+516T2(F=4.262) D(debts) = 903,929+28,300T-438T2(F=3.339) A(assets) = 200,816+1,213,336T-12,930T2(F=21.069) To carry on a reasonable farm household management, a suitable measure to cope with the desire of family and the economic conditions of farm household should be prepared.

• 한국농공학회논문집
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• 제61권1호
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• pp.85-93
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• 2019

The objective of this study is to assess the environmental effect of the reclaimed land drainage method using oyster shell through the Life cycle $CO_2$ assessment, and to evaluate the applicability in South Korea. In this Study, the life cycle $CO_2$ emissions of oyster shell (OS) and crushed stone (CS, as avoided product) were assessed and compared. The Life Cycle Assessment method was used for quantitative evaluation of direct or indirect environmental effects of OS recycling. $CO_2$ was selected as the evaluation target material, and the scope of assessment includes the acquisition of materials, processing, transportation, construction phases. Compared to using CS, 77.0% of $CO_2$ emissions in acquisition and processing, 47.0% in transportation and 6.5% in construction phase were reduced, respectively by using of OS. The maximum transportation distance of OS was estimated according to transportation distance of CS. OS has environmental advantages than CS within about 26 - 101 km from the source. OS was found to be applicable to reclaimed lands up to 810 ha, 3,910 ha from Tongyeong and Yeosu, respectively. In addition, the amount of OS that could be used as drainage material for reclaimed land was much higher than annual OS production of South Korea. Therefore, it is considered that OS is sufficient to be used as drainage material for reclaimed land in South Korea.