• Korean Journal of Construction Engineering and Management
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• v.9 no.6
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• pp.204-215
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• 2008

Demolition work is a precedence activity that is performed earlier than other remodeling activities. And demolition work is one of the critical path activities. So, demolition work is needed for systematic plan and management. However, contractors of the remodeling project established a rough plan and did not consider recycling wastes, safety of workers and structural stable of building. To improve this problem, a eco-friend process model of remodeling project is needed to be established. The process model is composed of five phases; 1) survey and analysis of general condition of demolition work, 2) prepare documents of demolition work 3) establishing demolition work plan, 4) demolition and inspection, 5) post-demolition management. Especially, demolition documents are based on establishing WBS, selecting the equipment and method, waste management and structure reinforcement. A process model of eco-friend demolition work is developed by using IDEF0 method.

• Korean Journal of Construction Engineering and Management
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• v.3 no.1 s.9
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• pp.91-96
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• 2002

The purpose of this study is to present a systemized flow of temporary facility(TF) planning information. The current TF planning tends to be established by subjective decision making of field workers. Therefore TF planning needs more systemized information flow to provide a reliable schedule. The study was implemented through interview with experts for reliable TF planning. The main contents of the study are as follows; 1) TF planning process model(IDEF0) are established. 2) Various information flow diagrams proposed to support TF planning decision-making. The study recommends that, as a future research, the computer system be developed for application of the information flow.

• Archives of design research
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• v.16 no.1
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• pp.251-260
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• 2003

The fact that office environment is a principal factor affecting work efficiency is widely accepted. Under such a circumstance, developing relocatable office wall systems is highly required. Psychological, physiological, and economical factors, along with physical factors, should be considered to develope a office wall system. More specifically, competitive price, relocatable efficiency, structural stability, fast installation, health and safety, and aesthetic satisfaction are typical determinants. The evaluation results of newly developed wall system are as below: 1) Panel structural system added with the merits of frame structural system can be studied to accomplish minimal disruption to workplace and better finish details. 2) To cover up the existing interior defects such as uneven floor and ceiling, flexible solutions must be studied especially when panel structural system is accepted. 3) More consideration must be given to finish materials, section details, sound blocking and absorbtion to enhance the satisfaction level.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.85-92
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• 2008

Demolition work is a precedence activity that is performed earlier than other remodeling activities. And demolition work is one of the critical path activities. So, demolition work is needed for systematic plan and management. However, contractors of the remodeling project established a rough plan and did not consider recycling wastes, safety of workers and structural stable of building. To improve this problem, a eco-friend process model of remodeling project is needed to be established. The process model is composed of five phases; 1) survey and analysis of general condition of demolition work, 2) prepare documents of demolition work 3) establishing demolition work plan, 4) demolition and inspection, 5) post-demolition management. Especially, demolition documents are based on establishing WBS, selecting the equipment and method, waste management and structure reinforcement. A process model of eco-friend demolition work is developed by using IDEF0 method.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.362-366
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• 2015

지난 백여 년 동안 인간은 과거의 그 어떤 선조들도 이루지 못한 지식과 기술의 발전을 통해 고도로 산업화된 사회를 이루었지만, 전 지구적으로 기후변화라는 부차적인 결과와 현실에 직면하고 있다. 이상기후 현상은 전지구 규모뿐만 아니라 일정한 소규모 지역에서도 관측되고 있으며, 국내에서는 특히 특정 지역에 국한되어 단시간에 발생하는 집중호우가 대표적인 사례이다. 현재까지 집중호우 발생 지역과 정도를 예측하기란 불가능한 상태이며, 산업화와 도시화가 진행될수록 그 피해는 더욱 증가할 것으로 예상된다. 따라서 집중호우에 대비한 도시 배수 시스템을 재점검할 필요가 있으며, 기존의 배수시설을 대체할 만큼 효율적인 배수구조물의 개발이 시급하다. 기존 도시지역의 측구형 수로관에는 마감불량, 정밀시공의 어려움, 이물질의 누적과 물고임, 노출로 인한 파손, 포장층 침투수 배수문제 등 많은 문제점들이 존재한다. 따라서 본 연구에서는 기존의 측구형 수로관의 단점을 보완하는 더욱 효율적인 집수정을 개발하고자 하였다. 집수정을 덮고 있는 포장층 상부면을 따라 흐르는 표면수를 처리할 뿐만 아니라, 포장층 내부로 스며드는 침투수를 처리 가능하도록 구조체 상부에 침투수 유입공을 설치하여, 표면수와 침투수를 동시에 고려하는 이중배수 시스템을 구성하였다. 본 연구에서 개발하는 집수정 구조체는 침투수에 의한 도로 및 구조체의 내구성 감소 및 겨울철 동파 현상을 방지할 수 있을 뿐 아니라, 단순공정, 시공성 향상, 유지비용절감 등 기존 배수 시스템과 비교해 많은 장점을 내포하고 있다. 본 연구에서 개발하는 이중배수 집수정의 효율 및 배수능력 평가를 위해서는 기존의 구조체와 차별되는 침투수 유입공에 대한 평가가 선행되어야 한다. 이를 위해서 침투수 유입공에 대한 실내 실험 장치를 구축하였으며, 반복 실험을 통해 침투수 유입공을 통한 배출 능력을 평가하고자 하였다. 또한 실험 결과를 바탕으로 구조체의 효능을 결정짓는 기준을 제시하고자 한다.

• Korean Journal of Construction Engineering and Management
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• v.20 no.3
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• pp.12-21
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• 2019

Specification is an important document for securing safe construction and improving quality as well as the contract document. Currently, the specifications used in modular buildings in Korea are only the construction specification, and most of the contents are used by borrowing the standard specifications of the building, so the contents of the modular buildings can not be reflected and it is contents are similar to the guideline book. The current status of domestic specification for modular buildings is affecting the quality of modular buildings. Therefore, we analyze activity through monitoring the modular process of modular buildings and analyze systematically relationship by applying IDEF modeling with analyzed activity. As result this paper proposes a structure of special specification specialized in modular building through generalization. The major classifications were divided into three stages : factory construction, transportation, and on-site installation. The specification structure was divided into 32 types of construction items from the floor slab assembly of the factory production to the joint finish of the on site installation in accordance with the opinion of experts.

• Korean Journal of Construction Engineering and Management
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• v.8 no.6
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• pp.150-158
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• 2007

As the amount of $CO_2$ emission in Korea is ranked 9th and the increasing rate of $CO_2$ emissions highest in the world, it is strongly necessary to devise methods to decrease the amount of $CO_2$ in each industry as the basis of establishing environmentally sustainable production system. This paper aims to identify the characteristics of $CO_2$ emissions from construction wastes throughout the simplified LCA (Life Cycle Assessment) and suggest the strategic guideline for the construction waste management plan to decrease $CO_2$. As a result of LCA on the case of a high-rise residential building project, total sum of $CO_2$ emission generated from construction wastes appeared as 6,818,123kg-$CO_2$ and $CO_2$ emission per unit floor area as 21.01kg-$CO_2/{\beta}{\ge}$. The principal waste materials generating more than 95% of $CO_2$ are materials such as reinforcing bar, temporary materials, cement, ready-mixed-concrete, concrete products, and tile, which have relatively high unit emission rate of $CO_2$ in the process of production. Besides, more than 92% of $CO_2$ was generated from the activities such as structure work, plaster work, temporary work, and tile and stone work, which are generally executed in the early phase of the whole construction period. Reflecting these results, the guideline for the construction waste management plan was recommended. If the waste management plan is established considering the guideline suggested, there would be high potential to decrease the amount of $CO_2$ generated from construction wastes.

• Journal of the Society of Disaster Information
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• v.19 no.3
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• pp.673-688
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• 2023

Purpose: Fires that occur during construction are infrequent, but cause great damage. Recently, with the growth of the logistics and distribution industry, the number of construction sites for new logistics warehouses is increasing, so it was selected as a research subject and research was conducted to reduce accidents at construction sites through the development of a fire risk assessment tool to quantitatively approach fire prevention. Method: A comprehensive fire risk assessment tool was accumulated by classifying the work in progress, classifying combustibles and ignition sources by grade, excluding air (oxygen), which is difficult to control, and additionally substituting evacuation safety. Result: Using the developed and proposed fire risk evaluation tool, excavation work with low fire risk, facility construction with medium fire risk, and finishing work with high fire risk were sampled to derive the result (CGI). Conclusion: In this study, it was possible to establish specific preventive measures and evaluate evacuation safety by controlling physical conditions (combustibles) and energy conditions (ignition sources) according to the risk assessment by developing a tool that can evaluate the risk of 14fire occurrence at construction sites. It is expected that in the future, through the application of the fire risk evaluation tool at construction sites, it will be provided as a criterion for establishing a process plan that can reduce risk and evaluating the adaptability of firefighting equipment.14

• Journal of the Korean Wood Science and Technology
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• v.36 no.6
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• pp.33-40
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• 2008

Normally, cedar heartwood has a red color. However, it frequently changes black color (blackening phenomenon). It is reported that blackening phenomenon of cedar has been caused by oxidation of phenolics and norlignan extractives under weak alkaline conditions. In this study, heat treatment and UV irradiation were carried out to reduce the difference of color value between blackened wood and bright sap wood. Effects of temperature, moisture content, treatment time and light on decrease of color difference between blackened heartwood and sapwood were evaluated in each treatment. A decrement of different color value between blackened heartwood and bright sapwood by hot-water treatment was bigger than others. An effect of the vacuum drying was similar to that of the kiln drying. UV irradiation decreases the color difference between dried blackened heartwood and bright sapwood. It is suggested that UV irradiation could be used as final treatment to reduce the color difference on wood during drying process. Determination of optimum conditions and development of hybrid process for control of discoloration will be needed in a further study.

• Korean Journal of Construction Engineering and Management
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• v.20 no.4
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• pp.56-68
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• 2019

An optimal selection of form-work is very important in the construction project in terms of construction cost and duration management. Also, it substantially affects the quality of the structure and the finishing work. However, in South Korea, the decision making on the selection of form-work has been based on the experience and intuition of construction practitioners not on the objective data or rational decision-making system. In order to solve the problem, several types of research on the selection of form-work has been processed. However, they did not consider the construction site condition, which is one of the most important factors for the selection of form-work. Thus, the objective of this study is developing the objective decision supporting system considering the site condition. This study provides the quantitative decision support model for optimal form-work based on construction site type. It is expected that the decision support model will help the practitioners decide optimal form-work based on the objective data. It will ameliorate the existing decision making process using experience and intuition. In addition, because the model considers site-conditions, it will provide more accurate and appropriate decision on the selection of an optimal form-work.