• 토지주택연구
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• 제10권3호
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• pp.77-87
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• 2019

In Korea, the modular construction method was applied to the construction of facilities such as military barracks and school dormitories, beginning with the pilot project of Seoul New Elementary School in 2003. In 2017, public modular houses were supplied to Busan(Yongho-dong) and Seoul(Gayang-dong), and modular housing is expected to continue to be supplied in the future. However, there is no clear construction standard for the modular housing construction yet, and there are few cases where the infill modular system is applied. Therefore, this study established the work breakdown structure and proposed a standard process focusing on the infill modular system applied to the construction of Dujeong-dong modular house in Cheonan. Level 1 of the work breakdown structure by construction stage of Infill modular was defined as modular manufacturing, assembly, and finishing process. Level 2 was defined as preparation, modular production, modular infill, modular fixing, floor plastering, building finishing, and other site finishing. Level 3 is defined as 57 detailed unit work of infill modular construction. The standard process of infill modular is proposed for the assembly stage that is commonly applicable to infill modular housing construction. The results of this study can be used for the process plan, transportation plan, lifting plan of modular housing construction.

• 한국건축시공학회지
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• 제17권4호
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• pp.385-391
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• 2017

공동주택의 공종별 책임 하자 보증기간은 과학적인 분석에 근거를 두지 않고 있어. 기간의 적절성이 분쟁의 원인이 되고 있다. 이에 따라 본 연구에서는 2010~2011기준 국토교통부 하자심사 분쟁조정위원회에 접수된 하자제기건수 중 공동주택 하자 중 가장 많이 제기된 마감공사의 하자실태를 파악하여 하자보수기간의 적절성을 평가하고자 하였다. 마감공사의 하자청구건수를 분석한 결과 대부분의 공종별 하자는 2년 이후에도 나타나고 있으며, 60% 정도만이 하자담보책임기간 내에 청구되고 있는 실정이다. 공종별 하자는 상호간에 연관성을 가지고 있으며 이러한 점은 시공의 관리 차원에서 고려되어 공법의 개선이 필요한 것으로 나타났다. 공동주택의 선호도에 큰 영향을 끼치는 시공능력평가 순위와 하자발생의 상관성이 낮은 것으로 보아 실제 수행하는 전문업체의 하자관련 검증 절차가 필요한 것으로 판단된다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
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• pp.245-246
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• 2015

Cases of lawsuit and conflict are increasing because of defects in apartments in use after the completion of construction. Further, with changes in the consciousness of residents and in the social environment, many residents are showing interest in defect-related lawsuits. However, the term of warranty liability defined in the current law is not practically appropriate, and the verification of the determination of the term of warranty liability is insufficient. Against this background, this research aims to evaluate the appropriateness of defect repair periods by examining the actual defect condition of the finishing work among the various defects related to apartments. Collected performance data are analyzed by statistical techniques by considering the defect occurrence rate per construction type and the construction year of the finishing work in apartment construction. The analysis results will be used as basic data for evaluating the appropriateness of the standards for the term finishing works warranty liability.

• 한국산학기술학회논문지
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• 제18권11호
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• pp.110-117
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• 2017

다수의 고층 주거 건물을 건설하는 공동주택 프로젝트에서 마감 공종은 단위세대마다 반복적으로 시공되므로 자원이 연속적으로 투입되도록 공정관리가 이루어지면 품질을 확보하면서 공기를 단축하고 공사비를 절감할 수 있다. Bar Chart, CPM, LOB와 같은 공정관리 기법은 반복 작업에 대한 표현과 적용의 한계점으로 인하여 공동주택 마감공사에 사용하기에는 적합하지 않다. 또한 택트 기반 공정관리 기법은 반복 공종의 작업 흐름을 일정하게 유지하기 어려울 뿐만 아니라 지속적으로 필요한 자원을 할당하기 위해서는 상당한 노력과 전문 시공업체의 협조를 필요로 한다. 공동주택의 마감공사는 벽체조성공사, 마감바탕공사, 바닥미장공사, 최종마감공사 순으로 진행되고, 각 공사에는 작업 방법, 작업 공간, 자원 생산성 등과 관련하여 다양한 특성을 가지는 하위 개념의 반복 공종들이 존재한다. 이 반복 공종들의 작업이 동기화되거나 마지막 작업구역에서 수렴되도록 하면 공정관리의 목표가 유효하게 달성될 수 있다. 따라서 본 연구는 공동주택의 단위세대에서 시공되는 작업들의 순서 관계, 작업 유형 분류 및 관리 방법, 자원의 연속적인 투입을 위한 시공속도와 작업구역 등의 요소들을 고려하여 마감공사를 위한 공정 계획 프로세스를 제시하고자 한다.

• 한국안전학회지
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• 제14권4호
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• pp.93-99
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• 1999

A try was carried out to reduce lead time of die manufacturing. That is to make manual machining and finishing work time shorter by improving CAD/CAM modeling methods, so called with "separate modeling" and "relief modeling". The manual machining and finishing manual work time were reduced adapting the novel CAD/CAM modeling methods. Ultimately we accomplished much reduction of the lead time of die manufacturing.f die manufacturing.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1993년도 추계학술대회 논문집
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• pp.499-504
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• 1993

To find a way for establishing work roll initial crown according to roll conditions, computer simulation for predicting plate crown in plate mill is done and effects of roll conditions on plate crown is analysed. Roll gap profile and plate crown are measured to be compared to the calculated values. As a result,a regression equation to establish work roll initial crown according to roll cooditions such as backup roll diameter, backup roll crown and work roll crown is obtained.

• 한국정밀공학회지
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• 제12권3호
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• pp.73-81
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• 1995

To find a way for establishing work roll initial crown according to roll conditions, computer simutation for predicting plate crown in plate mill is done and effects of roll conditions on plate crown is analyzed. Toll gap rorfile and plate crown are measured to be compared to the calculated values. As a result, regression equation to establish work roll initial crown according to roll conditions such as backup roll diameter, backup roll crown and work roll diameter is obtained.

• 한국의류산업학회지
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• 제13권2호
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• pp.269-278
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• 2011

This study aims at setting up productive capacity which can be usefully utilized for work management of apparel manufacturers. So as to achieve this goal, an apparel manufacturing company which has been operated by miniline system in Seoul was selected. Standard time and man-hour were calculated to create the accurate productive capacity by observing and measuring a work flow included cutting, sewing and finishing processes. And the result is as following. The standard time for each process was presented as cutting process 47004.5s, sewing process 671050.5s and finishing process 22426.3s. And 15284.4ms was computed as total procession man-hour per day of the manufacturer which is organized of 16 people. Also, the procession man-hour for each process was revealed as cutting process 396.7ms(2.6%), sewing process 14509.3ms(94.9%) and finishing process 378.5ms(2.5%). +Surplus was found in the productivity for each process included the cutting process(outshell, lining and seam process), the sewing process(preparation and arrangement process) and the finishing process. But, additional man-hour 52436.18ms was required because the productive capacity was calculated as -surplus(-13.9%) in the sewing process(part and assembly process). Therefore, a work schedule was planned based on the previous result. However, loading can be ideal when a capacity and a load become '0'. The object company should find the way to reduce allowance(26.25%) of the sewing process through reconstruction of consciousness and improvement in functions with analyzing works of operators. Also, they need to consider an additional supplement of the personnel.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제10권9호
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• pp.359-366
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• 2021

대한민국 건설사들은 아파트 하자 정보를 축적하고 보수작업을 관리하기 위한 시스템을 운영하는데 상당한 인력과 비용을 투자하고 있다. 본 연구에서는 하자 접수 상세내용 텍스트 데이터를 이용하여 하자 보수 시설공사에 따른 세부공종을 분류하는 머신러닝 모델을 제안한다. 두 가지 단어 임베딩(Bag-of-words, Term Frequency-Inverse Document Frequency (TF-IDF))과 두 가지 분류기(Support Vector Machine, Random Forest)를 통해 한국어로 작성된 65만건 이상의 하자 접수데이터로부터 하자보수 시설공사 세부공종을 분류했다. 특히, 이번 연구에서는 특정 시설공사(마감공사)의 9개 세부공종(가전제품, 도배공사, 도장공사, 미장공사, 석공사, 수장공사, 옥내가구공사, 주방기구공사, 타일공사)을 분류하는 이진분류 모델과 다중 분류 모델을 연구했다. 그 결과, TF-IDF와 Random Forest를 사용한 두가지 분류 모델에서 90%이상의 정확도, 정밀도, 재현율 및 F1점수를 확인했다.

• 한국정밀공학회지
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• 제21권10호
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• pp.50-56
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• 2004

Finishing is the final process in molds manufacturing and consumes much process time. Also, it influences on surface quality of molds. But, there are few systematic methods to control the process. In this work, basic experiments were carried out to study the machining characteristics of the finishing tools. From the experiments, critical surface roughness and wear coefficient are suggested to reduce the number of finishing steps and to plan a systematic finishing procedure. Comparison experiments were carried out between the expert's method and the new method, which is based on the results of this research. From the experiments, it is verified that the systematic method takes less time and generates less form error in the machined surface than the worker's method.