• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2006년도 추계 종합학술대회 논문집
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• pp.84-89
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• 2006

과학기술 분야에서의 기술 발전 속도에 맞추어 해당 분야의 용어 역시 생성과 소멸을 끊임없이 반복한다. 본 연구에서는 아직까지 체계적으로 다루어지고 있지 않은 용어 생명주기를 정의하고 다양한 관점으로 대용량 말뭉치에서 추출된 용어들을 분석함으로써 그 필요성을 주장하고자 한다. 용어 추출을 위한 대상으로서 12년 분량의 1,700여만 어절을 포함하는 전자신문 말뭉치를 선정하였는데, 그 이유는 여러 기간에 걸친 말뭉치이므로 용어 생명주기 추이를 파악하기 용이하며, 기술 발전이 빠른 대표적인 분야인 컴퓨터/IT/전기 전자를 포함하고 있기 때문이다. 본 연구를 통해 기간에 따른 용어 생명주기 변화, 용어 수명과 전문성과의 관계 등 여러 분석 결과를 얻었으며, 앞으로 일반 사전에의 등재 여부를 결정이나 유사 기술 간의 경쟁 구도를 분석 등 다양한 응용 분야에 활용될 것으로 기대 한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.6-14
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• 2007

The objective of this research is to comparative LCA(life cycle assessment) between two different model of Electric Motor Unit(EMU).the environmental impact of Aluminum body Electric Motor Unit(EMU) and Stainless Steel(STS) body Electric Motor Unit(EMU). LCA process consists of four steps which are goal, scope definition, life cycle impact analysis(LCIA) and life cycle interpretation. ISO 14044 provides the LCA standard method which can be conducted by using comparative LCA. From the research it is foung that the Aluminium Body Electric Motor Unit (EMU) is 3.6ton heaver than Stainless Steel(STS) body Electric Motor Unit(EMU). The system boundary of both Electric Motor Unit (EMU) are same life span and travel same distance. These both Electric Motor Unit (EMU) has same kind of environmental impact which is maximum Ozone Depletion(OD). During using period of these two models, the Aluminium Body Electric Motor Unit(EMU) has more global warming(GW) effect but Stainless Steel(STS) body Electric Motor Unit(EMU) has more Ozone Depletion(OD) effect. The above result is obtained by using LCA software PASS verson 3.1.3.

• 열처리공학회지
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• 제16권3호
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• pp.141-147
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• 2003

The effects of heat treatment on the fatigue life and welding residual stress of welded plates were investigated in this study. The plates were welded by flux cored arc welding process, and post weld heat treated at $600^{\circ}C$ for 1 hour. The residual stresses of welded plates before and after post weld heat treatment were measured by hole drilling method. To measure the fatigue life of welded plates, low cycle fatigue tests under strain control and high cycle fatigue tests under load control were performed respectively, by using cylindrical specimens containing weld metal and heat affected zone. The obtained result shows that the post weld heat treatment reduces the residual stress, and resultantly changes the fatigue life of welded plate. Goodman diagrammatic analysis has also been performed to study the effect of post weld heat treatment on the high cycle fatigue life.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2008년도 춘계학술발표대회 논문집
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• pp.393-398
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• 2008

The environment is the important resource to use as well as to conserve for the development. Since 1990s, it has accentuated the importance of the environment and tried to conserve the environment in many areas. Among many area, the building industry has played a role to destruct the environment for providing the living decent space and brought the environmental affect. Therefore, the building industry should endeavor to mitigate the environmental affect. In building life cycle, it consumes the energy and natural resources. But it is difficult to evaluate the environmental affect during the whole building life. It is impossible to calculate the environmental affect without the much time and effort. Therefore. it requires the easy and handing program to calculate the affect to environment in each building life cycle. Until now, many program for assessing the affect to the environment have been developed and limitedly used because of the assessment scope and contents. In this paper, it aimed at developing the assessment program of LCA, focused on the energy consumption and carbon-dioxide emission compared with the domestic and foreign concerned programs. The developed program is divided into 3 areas; construction, maintenance, demolition.

• 설비공학논문집
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• 제16권11호
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• pp.1060-1067
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• 2004

To apply an analysis method of life cycle cost when assessing economics of equipment system, we should basically set up preconditions such as useful life, price escalation rate, interest rate, etc. as well as consider a calculation algorism of source energy and heat source system, which is a complex process for life cycle costing. For this reason, equipment designers tend to plan heat source systems, without a thorough investigation on economics of alternative systems at the pre-design phase. In this process, architectural designers should adopt a proper heat source system, which is one of the most important factors for planning an appropriate architectural design, through a discussion with equipment designers in a short time. In order to offer an evaluation method for equipment designers to analyze economics of an alternative heat source system easily at the pre-design phase, this research would define the simplified economics, evaluation method through analysis of existing papers for economics evaluation, and examine validity through comparison of simplified method values ($LCC_{EC}$) and life cycle costing values ($LCC_{15}$) for six alternative heat source systems.

• International Journal of Railway
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• 제9권1호
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• pp.10-14
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• 2016

Life cycle cost analysis is compulsively required for the system operation. System operation costs are consisted of acquisition, operation, maintenance and so on. In the beginning of the system planning, we need to take into account of various costs following the system operating. To implement LCC, we need to analyze system life cycle to identify all costs during system life. The costs can be divided into three parts. The first part is purchasing cost, the second for operating cost and the last for disposal cost. The second operating cost can be decomposed of operating cost included labor, energy consumption cost for system running, maintenance costs to keep systems healthy, delay cost caused from maintenance and hazard cost, and so on. In this paper, we carried out for railway locomotives which operate over more 30years and which cost about 10 million USD. We decompose the life cycle of the locomotives and break down the locomotives into subsystems to require maintenance or not, and subsystems to need energy or not. We showed how to decide optimal locomotives through cost identification and system breakdown.

• 토지주택연구
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• 제12권4호
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• pp.31-40
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• 2021

본 연구는 연령에 따른 주택수요의 비단조성에 착안하여 주택 소유 및 거주 형태를 추정하였다. 이를 위해 스플라인 로짓 모형을 채택하였고 생애주기에 따라 주택소유수요가 비단조적임을 밝혀내었다. 우리나라 가구의 무주택 확률은 생애주기에 따라 가변적이다. 청년층일 때 소형 무주택으로 시작하여 중장년 때 중대형 주택을 소유하게 되고 노년층에는 주택을 처분하고 소형주택을 선호하게 되는 것으로 나타났다.

• Journal of Photoscience
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• 제10권2호
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• pp.195-198
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• 2003

In the cellular response to DNA damaging agents, cells undergo cell cycle arrest or apoptosis against irrepairable DNA damage. RpS3 is known to function as UV DNA repair endonuclease III and ribosomal protein S3. In this study, we used normal and rpS3-overexpressed 293T cells to examine the role of rpS3 in response to DNA damaging agents. When 293T cells transfected with rpS3 were irradiated with UV, the pattern of cell cycle was dramatically changed in comparison with un-transfected 293T cells. We also found that the expression of rpS3 in normal cells was increased by treatment with DNA damaging agents. By means of Western and Northern blot analyses in rat tissues, we showed the expression pattern of rpS3 protein and its mRNA. These data suggest that DNA repair and cell cycle arrest are interrelated to each other through rpS3, and the increased expression of rpS3 seems to regulate the cell cycle arrest by DNA damaging agents.

• 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.