• 한국건설관리학회논문집
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• 제14권1호
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• pp.144-152
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• 2013

Design is an iterative, generative, and multidisciplinary process by its nature. Iteration occurs often in most of the engineering design and development projects including construction. Design iterations cause rework, and extra efforts are required to get the optimal sequence and to manage the projects. Contrary to simple design, isolation of the generative iterations in complex design systems is very difficult, but reduction in overall iterations is possible. Design depends upon the information flow within domain and also among various design disciplines and organizations. Therefore, it is suggested that managers should be aware about the crucial iterations causing rework and optimal sequence as well. In this way, managers can handle design parameters related to such iterations pro-actively. There are a number of techniques to reduce iterations for various kinds of engineering designs. In this paper, parameter based Design Structure Matrix (DSM) is chosen. To create this DSM, a survey was performed and then partitioned using a model. This paper provides an easy approach to those companies involved in or intend to be involved in "design and build projects".

• 한국해안해양공학회지
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• 제19권3호
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• pp.237-243
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• 2007

잔교식 안벽구조물의 확률론적 지진위험도 해석을 수행하였다. 부지응답해석을 통해 증폭된 지표 지진이 구조물에 가해질 때 강관파일의 조합응력비와 최대수평변위가 한계상태를 초과하는 확률을 지진취약도 곡선으로 표현하였다. 해당 지역의 지진발생확률은 항만설계기준의 지진재해도를 이용하여 최대지반가속도의 초과확률을 구할 수 있었다. 구조물의 최종적인 지진위험도는 지진취약도와 지진재해도를 이용하여 산정하였으며 수치해석 예제를 통해 그 결과를 제시하였다.

• 건축역사연구
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• 제28권2호
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• pp.7-18
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• 2019

The Chosun Dynasty established and implemented measures to prevent Japanese invasion into the southern coast. To this end, the number of naval vessels and the number of ships were increased, and a shipyard(船所) was constructed to protect the safety of the vessels. The shipyard is a port facility where military vessels are anchored and repaired, as well as public facilities that are needed for military training on public and land, as well as facilities for storing supplies and equipment needed for ships on land and defense at the port entrance. Despite being such an important facility for national defense, Shipyard has not been noticed. Studies have shown that the position of shipyard is divided into the riverside type and the riverbank type, which is due to the topographical features of Korea. The repair cycle of naval vessels, the carrying out of Yeonhun(prevent the water from decaying the part of the ship, a raw tree was burned to smoke) and the place of sea training also affected the construction of the Gul River(掘江). The space structure of shipyard is divided into port entry facilities for monitoring and controlling at the entrance to the harbor, border facilities for folding and repairing military vessels, and land facilities for holding land exercises and administrative work of military vessels and military equipment.

• 한국해안·해양공학회논문집
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• 제20권2호
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• pp.184-193
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• 2008

아산호 상류지역의 도시화 진행과 이상 기후 등에 따른 강수량 증가로 아산만 방조제 배수갑문 확장의 필요성이 제기됨에 따라 배수갑문 확장으로 인한 방류량 증가가 아산만 및 주변 해역에 미치는 영향을 수리모형실험과 범용 수치모의 코드인 Delft3D, FLOW-3D를 이용하여 검토하였다. 그 결과 아산만 방조제 배수갑문확장에 의한 영향은 미흡한 것으로 확인되었다.

• 한국해양공학회지
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• 제32권2호
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• pp.123-130
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• 2018

The present study investigated the validity of an equilibrium shoreline empirical formula for real phenomena. Among three types of equilibrium shoreline formulas, Hsu's parabolic type static formula was employed, which is well-known and the most practical for shoreline estimation after coastal or harbor structure construction. The wave data observed at Maengbang beach and the CERC formula on longshore sediment transport were used in the present investigation. A comparison study was only conducted for the case of a shoreline change after the construction of a groyne. Reasonable agreement was seen between the observed wave data and the data obtained under a wave angle spreading function S = 3.5. However, significant changes were observed when S increased. Thus, careful application is required when using Hsu's formula.

• 천문학회보
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• 제40권2호
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• pp.49.1-49.1
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• 2015

Star formation in galaxies that lie in dense environment tends to increase as the redshift of the cluster increases. At z~1.4, the situation turns to be complex; some clusters still harbor galaxies with vigorous star formation, and others are populated with relatively old, massive galaxies. We present the result from narrow-band photometric study of the fields around the radio galaxy 6CE 1100+3505 at z=1.44. Deep H- and H-narrow band data have been obtained using CFHT/WIRCAM which cover the corresponding wavelengths for redshifted $H{\alpha}$. While the number of IRAC 3.6, and $4.5{\mu}m$ selected sources show clear excess within the central ~1Mpc area from the radio galaxy, number of galaxies identified to show excess in H-narrow band is very small. We discuss the possible integrated star formation rate in this overdense structure, and the implication to the evolution of cosmic star formation rate as a function of environment.

• Ocean and Polar Research
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• 제26권1호
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• pp.43-50
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• 2004

The diffusion model, which considers diffusion and sorption, is proposed. The FEM program developed on the basis of the diffusion model provides the estimation of chloride concentration according to cyclic humidity and sorption. After the humidity diffusion analysis is carried out, the chloride ion diffusion and sorption analysis are conducted on the basis of the preestimated humidity data in each element. Each element has different analysis variables at different ages and locations. At early ages, the difference between inner and outer relative humidity causes the chloride ion penetration by sorption. As the humidity diffusion reduces the difference with age, the effect of sorption on the chloride ion penetration decreases. By the way, the cyclic humidity increases the effect of sorption on the chloride ion penetration at early ages, and the quantity of chloride ion around steel at later ages. Therefore, the in situ analysis of chloride ion penetration for marine concrete structures must be performed considering the cyclic humidity condition and the long term sorption.

• 한국정보처리학회논문지
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• 제4권12호
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• pp.3023-3032
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• 1997

본 논문에서는 최소한의 구조성을 갖는 하이퍼스페이스 학습 환경에서의 수업 진행에 있어서 두가지 개별적 인 차이에 관하여 연구하였다. “펄 하버”라는 하이퍼 스택의 사용에 있어서 GEFT(Group Embeded Figure Test)를 통해 보면, 장 종속적인(Fleld Dependsnt) 사용자는 장 독립적인(Field Independent) 사용자보다 더욱 자주 지침서를 사용하였으며, 연구후 FI 사용자가 궁극적으로는 더욱 높은 시험 결과를 보여 주었다. 또한, FD 사용자가 일정한 형식의 진행 과정을 보여 주지 않은 데 반해, FI 사용자는 일정한 형태의 학습 진행 과정을 나타내었으며, 영상 사고가 높은 학습자가 하이퍼스페이스 학습환경에서 더욱 큰 교육 효과를 얻게되는 것으로 나타났다．

• 환경영향평가
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• 제22권3호
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• pp.255-264
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• 2013

This paper diagnosed the assessment problems and development types of the simple statement of the Sea Area Utilization Consultation System. and suggested the key assessment items for system improvement. The major types of Public Water occupation and use, and distribution characteristic of regional and coastal were analyzed by evaluate 529 review items during 2010-2012. The artificial structure installation including harbor and fishing port facilities in the South and West coast, and seawater supply and drainage for land-based aquaculture and power plant were dominated. The checklists considering each types of occupation and use in Public Water were suggested. In addition, policy proposals for system improvement were suggested.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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• pp.1255-1260
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• 2000

The service life is defined as the period of the period of time, until repair becomes necessary to maintain the serviceability of structures. It is getting more common to specify the service life of a structure, particularly structures exposed to de-icing salt water. To accomplish this study, pier in the harbor was chosen as a experimental area. The service life of decks in marine environment was calculated as sum of three period ; initiation period, propagation period and cracking period. The object of this study is to indicate where and how measures can be adopted for checking relevant service lifes.