• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1996년도 가을 학술발표회 논문집
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• pp.258-266
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• 1996

The purpose of this study is to make a reasonable correction in construction stage through exact prediction of long-time differential column shortening that occurs in the high-rise RC building. For this, a self-developed program adopted PCA code is used to predict differential column shortening with sequential loading process. Using this program, the amount of the different column shortening of Amatapura Apartment in Indonesia is predicted and the effect is analyzed. From the result, the major factor affecting the shortening amount in columns is elastic strain and the effect of shrinkage is very small rather than creep. And maximun differential column shortening is appeared near the middle of the building.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
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• pp.67-70
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• 2011

The effect of column shortening is a major consideration in design and construction of tall buildings, especially in concrete and composite structural systems. To avoid unexpected demage in structural and nonstructural elements, differential shortening between vertical members resulting from differing stress levels, loading histories, volume-to-surface ratios and other factors in a high-rise building must be properly considered in the design process. This paper represents analyzed and measured shortening results of RC cores and columns at the 72 story Haeundae I'Park. It shows that WACS program based on ACI and PCA material model is effective for the prediction of column shortening.

• 상하수도학회지
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• 제24권2호
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• pp.203-210
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• 2010

The signification of calorie/water (C/W) ratio was investigated in the treatment of highly concentrated organic wastes by thermophilic oxic process (TOP). Swine waste was used in this study. When C/W ratio was 1.6, most of swine waste was decomposed and all water was evaporated in the 24-h injection cycle. To improve treatment efficiency of TOP treating swine waste, the effect of shortening the swine waste injection cycle was examined. The shortening of injection cycle was conducted to stimulate the activity of thermophilic bacteria. A high temperature in the reactor was maintained by shortening of the injection cycle. When the swine waste injection cycle was shortened, the C/W ratio was fixed at 1.6. As a result, by shortening the swine waste injection cycle from 24-h to 12 and 6-h, the maximum loading rate of swine waste per day could be improved 1.9 and 3.5 times, respectively.

• 한국지진공학회논문집
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• 제3권1호
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• pp.93-102
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• 1999

건물의 고층화가 이루어지면서 구조부재에 미치는 축력이 증가하게 되고 축소현상을 발생시킨다. 이러한 축소현상은 구조물의 사용헝 저하를 가져올뿐만아니라 2차 응력 발생으로 구조물 자체의 안전에도 영향을 미친다. 수직구조부재의 축소량을 예측하는 목적은 인접 부재간의 부등축소를 보정하는 데 있다 본 논문에서는 시공과정에서만 보정을 실시한 경우와 설계단계에서 축소량을 예측하여 보정을 한 경우에 대해 각각 지진하중을 적용하여 구조부재에 미치는 영향에 대해 비교.검토를 하였으며 수직구조부재의 축소량은 반드시 예측되어 보정을 실시하여야 하는 것으로 나타났다.

• Advances in concrete construction
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• 제10권6호
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• pp.527-536
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• 2020

In this study, a process is proposed to calculate analytical correction values for the vertical shortening of all columns on all floors in a high-rise building that minimizes the error between the structural analysis predictions and values measured during construction. The weight ratio and the most probable value were accordingly considered based on the properties of the shortening value analyzed at several points in each construction stage and the distance between these measured points and unmeasured points at which the shortening was predicted. The effective range and shortening value normalization were considered using the column grouping concept. These tools were applied to calculate the error ratio between the predicted and measured values on a floor where a measured point exists, and then determine the estimated error ratio and estimated error value for the unmeasured point using this error ratio. At points on a floor where no measured point exists, the estimated error ratio and the estimated error value were calculated by applying the most probable value considering the weight ratio for the nearest floor where measured points exist. In this manner, the error values and estimated error values can be determined at all points in a structure. Then, the analytical correction value, defined as this error or estimated error value, was applied by adding it to the predicted value. Finally, the adequacy of the proposed correction method was verified against measurements by applying the analytical corrections to all unmeasured points based on the points where the measurement exists.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 제4회 박판성형 심포지엄
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• pp.41-52
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• 2003

The tendency of current die manufacturing is focusing into development period shortening and panel quality improvement. This brings change of manufacturing process. In existing process, depended on experience, we were faced on a limit of sufficiency in this focus. Thus, we have attempted to make a conquest of that by constructing a process of CAE. Our attempt apply not only draw die formability but also trimming and flanging die formability with simulation of sheet metal. In this paper, we publish effects that were obtained by constructing a process.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.133-138
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• 2003

Axial shortenings of wall and columns were measured on level 2 and precise leveling between wall and columns were surveyed on level 5 at the Galleria Palace structure. Measured and surveyed shortening values were compared with the analysis results at the earlier stage on the process of construction for evaluating the predicted values. Though measured values represent relatively low and scattered values at earlier construction stage, probably they show similar slope curves to predicted ones with the progress of time.

• 한국건설관리학회논문집
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• 제5권4호
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• pp.87-96
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• 2004

건설공사에서 공기는 매우 중요한 요소로 건설사업비에 미치는 영향이 크다. 선진국들은 공기단축을 통한 건설사업비 절감을 위해 노력하고 있다. 국내에서도 공기단축의 필요성을 절감함으로써 공기단축을 위해 많은 노력을 기울여 왔지만, 그 효과는 아직 미미한 것으로 나타나고 있다. 향후 주 5일 근무제가 시행되고, 후분양제가 도입될 경우, 건설사업비 절감이나 리스크 관리측면에서 공기단축은 필수불가결한 요인이 될 것이다. 공기를 효과적으로 단축하기 위해서는 공기에 영향을 미치는 중요요인과 공정 메커니즘을 명확하게 분석해야 한다. 이러한 사항들이 규명될 때 효과적인 공기단축이 가능해져 건설사업비를 줄일 수 있게 될 것이다. 이에 본 연구에서는 아파트 건설공사에서 공기의 $40\sim50\%$를 차지하는 골조공사의 기준층에 대한 공정메커니즘을 분석하여 골조공사의 공기에 영향을 미치는 요인들을 규명하고자 한다. 또한, 도출된 요인들을 효과적으로 활용할 수 있는 방법들을 사례 분석함으로써 합리적인 공기단축방안을 제시하고자 한다.

• 산업경영시스템학회지
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• 제21권45호
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• pp.309-318
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• 1998

This paper is concerned with the set-up of the CE(Concurrent Engineering) model for the shortening of new product development. Recently, the situation of the new product development has been drastically changed. Customers require cheaper, better, stronger products in shorter product cycle time. To cope with this requirements from customers, engineers must accept new paradigm based on the CE and some special tools. This paper shows a tool, CE which is a good for shortening of new product development. So, CE was applied broadly in whole process of new product development and we could make it very successfully in quality, function, cost and developing time.

• 한국건축시공학회지
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• 제18권3호
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• pp.277-283
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• 2018

공기를 획기적으로 감소시킬 수 있는 모듈러건축으로 유사 모듈이 반복되는 공동주택을 건설하는 안에 대해 현행의 시공방법을 고찰한 결과 설비시스템에서 개선할 점을 발견하고, 그 방법으로 공장제작과 현장설치부분을 구분해서 살펴보고 현재 모듈러생산사 실무진의 의견과 종합건설사 기술담당자의 의견으로 그 가능성을 확인하고자 했으며 그 과정에서 제기된 문제에 대해 원천적인 관점에서 쉽게 풀어나갈 수 있는 방법으로 유리한 설계안을 제안하였고, 접속부위의 누수하자와 같은 고질적 문제점에 대한 대안을 기재하였다.