• Journal of Construction Engineering and Project Management
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• 제7권2호
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• pp.1-10
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• 2017

The Clonal Selection Algorithm (CSA) is an algorithm inspired by the human immune system mechanism. In CSA, several parameters needs to be optimized by large amount of sensitivity analysis for the optimal results. They limit the accuracy of the results due to the uncertainty and subjectivity. Adaptive Clonal Selection (ACS), a modified version of CSA, is developed as an algorithm without controls by pre-defined parameters in terms of selection process and mutation strength. In this paper, we discuss the ACS in detail and present its implementation in construction site utilization planning (CSUP). When applied to a developed model published in research literature, it proves that the ACS are capable of searching the optimal layout of temporary facilities on construction site based on the result of objective function, especially when the parameterization process is considered. Although the ACS still needs some improvements, obtaining a promising result when working on a same case study computed by Genetic Algorithm and Electimze algorithm prove its potential in solving more complex construction optimization problems in the future.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.506-513
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• 2009

The Construction Industry Institute (CII) developed the Project Definition Rating Index (PDRI), as a part of their Front End Planning best practices, which helps project managers assess and measure project scope definition risk elements. U.S. Green Building Council are seeing the benefits of sustainable building and Leadership in Energy and Environmental Design certification by positively impacting life cycle costs, building marketability, and organizational productivity. However, there have been no efforts to integrate these two planning tools in construction industry. By applying a supplemental tool which combines the PDRI with the LEED rating system, construction industry can develop and implement a tailored instrument that leads to total project success in sustainability. The objective of this research is to assemble a new front end planning mechanism for green buildings by incorporating the current PDRI and LEED systems.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.556-560
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• 2011

Players of construction projects proceed with each work process by information gathering, modification and communication. Due to the complex and long-span lifecycle projects increased, it became more important to grasp this mechanism for the successful project performance in construction project. Hence, most project information management systems or knowledge management systems equip information retrieval system. There are two logic to infer the meaning of retrieval target; inductive reasoning and deductive reasoning. The former is based on metadata explaining the target and the later is based on relation between data. To infer the information flow, it is necessary to define the correlation between players and work processes. However, most established information retrieval systems are based on index search system and it is not focused on correlation between data but data itself. Thus, this research aims to research on process of information flow retrieval system for large-scale construction projects.

• 한국강구조학회 논문집
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• 제13권4호
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• pp.327-335
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• 2001

강관 적층용접부에서 발생하는 잔류응력의 특징과 생성 메커니즘을 밝히기 위해 유한요소법을 이용한 3차원 열탄소성 해석을 수행하였다. 용접에 의해 강관을 접합할 때, 원주방향잔류응력과 두께방향잔류응력은 강관 내 외부에서 모두 접합부에서 인장응력이 발생하고, 길이방향잔류응력은 강관 내무에서 인장응력, 외부에서 압축응력이 발생된다. 또한 강관 적층 용접부의 잔류응력 생성기구를 명확히 하였다. 그 결과, 강관의 용접에 의한 잔류응력은 열응력에 의해 발생 할 뿐만 아니라, 강관의 기하학적 형상변화에 의한 영향도 받는다는 것을 밝혔다. 그리고, 용접조건과 강관의 제원이 달라질 경우에도 잔류응력 생성기구가 변함이 없음을 밝혔다.

• 한국통신학회논문지
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• 제32권8B호
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• pp.539-546
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• 2007

개인 방송 서비스를 다수의 사용자들에게 제공하기 위해서 본 논문에서는 오버레이 멀티캐스트 기반의 알고리즘을 적용한 효율적이고 향상된 성능을 제공하는 miniOverlay Broadcasting Control Protocol(mOBCP)을 제안하였다. mOBCP는 서비스를 받고자 대기하는 자식 노드들에게 대기시간을 최소한으로 줄이면서 가능한 빠르게 부모 노드를 찾을 수 있는 알고리즘과 서비스를 받던 기존 부모 노드의 경로에 Failure가 발생 되었을 경우 새로운 부모를 찾아서 빠르게 다시 서비스를 가능하게 할 수 있는 성능 효율적인 Mechanism을 본 논문에서는 제안한다. 성능비교는 제한된 트리 구성 시간 변화에 대한 지연(Latency)을 시뮬레이션을 통하여 결과를 얻어내었으며 결과를 통해 제안된 기법의 효율성을 보여주고 있다.

• 한국강구조학회 논문집
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• 제14권6호
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• pp.835-843
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• 2002

본 논문은 외부 T스티프너로 보강한 콘크리트 충전각형강관-H형강보 접합부의 응력전달 메카니즘을 유한요소해석을 통해 정확히 이해하고, T스티프너에 관한 설계기본자료를 제공하는데 그 목적이 있다. 따라서 선행된 실대형 접합부의 실험결과와 비선형 유한요소해석의 결과를 비교함으로써 유한요소해석의 신뢰도를 높였다. 유한요소해석에서 접합부의 응력전달 메카니즘을 이해하기 위해 여러 가지의 응력 및 변형도 지수를 사용하였고, 유한요소해석을 통하여 실험에서 발견된 보플랜지와 수평스티프너 접합부의 응력집중을 감소시킬수 있는 방안을 모색하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2005년도 지반공학 공동 학술발표회
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• pp.84-91
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• 2005

In case of soil nailing system, there have been many attempts to expand into slope and temporary earth retaining system stabilization method since the first ground excavation earth retaining system construction in 1993. Recently, jointing wall, underground wall of buildings and excavation earth retaining wall, construction were increasingly applied for effective utilization of the limited underground space and land application maximized. However, the application of joining wall into retaining wall or building by temporary soil nailing system and design of permanent wall were performed by using Rankine earth pressure theory without considering the distribution of earth pressure in the soil nailing. In this study was performed to introduce the design case by 'Two-Body Translation mechanism (TBTM)' to be able to consider distribution of earth pressure in the soil nailing when designing the permanent jointing wall using soil nailing system for effective utilization of ground space. Also, this study attempts to evaluate the earth pressure change, decreasing effect of wall displacement and increasing effect of stability when advanced soil nailing system is constructed using $FLAC^{2D}$ ${\nu}er.$ 3.30 program and 'Two-Body Translation mechanism'.

• 한국강구조학회 논문집
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• 제10권2호통권35호
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• pp.177-186
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• 1998

콘크리트 충전 강관 기둥은 동일 단면의 비충전 강관 기둥에 비해 압축 내력이 우수하며 충전 콘크리트에 의한 강성의 향상, 국부좌굴 보강 효과에 의한 인성의 향상 등과 같은 구조적으로 우수한 점이 많다. 그러나. 강관과 충전 콘크리트의 상호작용 효과, 응력 분담율, 콘크리트의 파괴 양상 등에 대해서는 불분명한 점들이 많다. 본 연구는 일련의 실험을 통하여 고강도 콘크리트 충전 강관 기둥에 대해 재하 조건에 따른 구조적인 거동 특성에 대해 고찰하였다. 특히, 본 연구에서는 재하조건에 따른 강관과 콘크리트의 응력 분담율, 충전 콘크리트의 파괴 양상등에 대해 조사 하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.37-38
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• 2017

In Infrared rays, which are 50% of sunlight, act as heat rays to heat buildings. Solar heat paint is widely used to protect buildings from sunlight. Solar heat coatings are used to block buildings form sunlight. Solar heat paints are classified as heat-reflective paints and heat-insulating paints according to the differential thermal mechanism. In this study, we study the thermal differential mechanism by analyzing the temperature change of the coated steel plate and the solar reflection spectrum on the surface. In this experiment, exposed steel plate, heat-reflective coated steel plate, heat-insulating coated steel plate, and general paint coated steel plate were used. As a result, when the infrared rays of 780nm ~ 1400nm were irradiated, the heat reflective paint had a temperature lower by 10 degrees than other paints. Analysis of the reflection spectrum of the paint shows that the heat paint is lower in heat than other paints because it has higher reflectance of light and absorbs much of the infrared rays.

• 자연, 터널 그리고 지하공간
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• 제21권1호
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• pp.101-112
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• 2019

This case study presented a simplified failure mechanism approach used as a preliminary deformation prediction for the Mexico City's metro system expansion. Because of the Mexico City's difficult subsoils, Line 12 project was considered one of the most challenging projects in Mexico. Mexico City's subsurface conditions can be described as a multilayered stratigraphy changing from soft high plastic clays to dense to very dense cemented sands. The Line 12 trajectory crossed all three main geotechnical Zones in Mexico City. Starting from to west of the City, Line 12 was projected to pass through very dense cemented sands corresponding to the Foothills zone changing to the Transition zone and finalizing in the Lake zone. Due to the change in the subsurface conditions, different constructions methods were implemented including the use of TBM (Tunnel Boring Machine), the NATM (New Austrian Tunneling Method), and cut-and-cover using braced Diaphragm walls for the underground section of the project. Preliminary crown and excavation front deformations were determined using a simplified failure mechanism prior to performing finite element modeling and analysis. Results showed corresponding deformations for the crown and the excavation front to be 3.5cm (1.4in) and 6cm (2.4in), respectively. Considering the complexity of Mexico City's difficult subsoil formation, construction method selection becomes a challenge to overcome. The use of a preliminary results in order to have a notion of possible deformations prior to advanced modeling and analysis could be beneficial and helpful to select possible construction procedures.