• 한국환경복원기술학회지
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• 제12권2호
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• pp.10-18
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• 2009

In order to determine the violation of right of light impact at adjacent residential area by high-rise building, analysis on the right of light for high-rise residential commercial complex building block at Gahngnam-ku, Seoul, Korea was carried out using Google Sketchup Pro. After the analysis th sunshine duration of B apartment decreased from 5 hours 16 minutes 3 hours 48 minutes by I hour 42 minutes after construction. It shows that the total sunshine duration is less than the Seoul City Government Standard which is more than 4 hours a day, or more than 2 consecutive hours. Lowering the heights of apartments by 54m would increase the total sunshine duration which would meet the Seoul City Government Standard by four hours seven minutes. Problems that rna lead to the violation on the right of light in the adjacent area should be discussed in advance and minimized by analyzing the right of light among buildings and structures which are scheduled to be constructed on the site during construction penni! process when high-rise building is proposed.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2007년도 정기학술발표대회 논문집
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• pp.805-808
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• 2007

건설산업이 고도화되어감에 따라 클레임이 빈번히 발생하고 있으며 그 중 공기지연으로 인한 사유가 많은 비중을 차지하고 있다. 이를 해결하기 위한 방안으로 공기지연분석에 대한 다양한 연구가 진행되고 있으며 효율적인 분석을 위한 시스템 구축의 필요성이 대두되고 있다. 따라서 본 연구에서는 기초문헌조사를 통하여 공기지연 분석에 사용되는 기법들을 분석하여 개선된 방법론을 제시하고 이를 바탕으로 시스템 구축방안을 제시한다. 향후 본 연구에서 제시한 구축방안을 통하여 전산화된 시스템을 개발함으로써 복잡한 공정으로 이루어진 건설공사에서 공기지연에 따른 책임일수를 효율적으로 산정할 수 있을 것으로 예상된다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.383-388
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• 2008

A modeling method for the impact analysis of plate structures employing Hertzian contact theory is presented in this paper. Since local deformation as well as bending deflection of the plate occurs due to the collision, it has to be considered for the impact analysis. When the coefficient of restitution is employed for the impact analysis, the local deformation is not considered. For more accurate and reliable impact analysis, however, the local deformation should be considered. The effects of the location of collision and the collision mass on the impact duration time and the contact force magnitude are investigated through numerical studies employing Hertzian contact theory.

• Journal of Construction Engineering and Project Management
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• 제4권4호
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• pp.33-40
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• 2014

Maximizing the profitability and minimizing the duration of construction projects in extreme weather regions is a challenging objective that is essential for project success. An optimization model is presented herein for the time-profit trade-off analysis of construction projects under extreme weather conditions. The model generates optimal/near optimal schedules that maximize profit and minimize the duration of construction projects in extreme weather regions. The computations in the model are organized into: (1) a scheduling module that develops practical schedules for construction projects, (2) a profit module that computes project costs (direct, indirect, and total) and project profit, and (3) a multi-objective module that determines optimal/near optimal trade-offs between project duration and profit. One example is used to show the impact of extreme weather on construction time and profit. Another example is used to show the model's ability to generate optimal trade-offs between the time and profit of construction projects under extreme weather conditions.

• International Journal of Naval Architecture and Ocean Engineering
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• 제12권1호
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• pp.157-167
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• 2020

The purpose of this study is to analyze the relationship between the occurrence of intermediate peak and time duration, and to conduct a review for the causes of the intermediate peak. In this test, ice impact tests were conducted using a bow side shell frame and ice specimen. A total of 70 samples were manufactured. Two types of ice specimen with relatively different surface conditions were used. The criterion for dividing the two types of ice specimen was the different exposure times to room temperature after freezing. This experiment was conducted for each parameter in order to reproduce the actual icebreaking situation. As a result of the analysis, the intermediate peak in the ice load signal have been found to be caused by mechanisms by which the inner surface of broken ice contact with hull immediately after the initial hitting point of ice has been broken.

• 한국수자원학회논문집
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• 제56권11호
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• pp.823-835
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• 2023

최근 이상기후의 증가로 강우강도가 높아지고 가뭄시기가 지속되는 현상이 나타나고 있다. 이러한 환경의 변화는 가뭄 현상의 장기화, 실시간 인지의 어려움이 있다. 일반적으로 가뭄은 강수량, 무강우지속일수 등 으로 판단할수 있다. 가뭄의 영향을 판단하는데 있어 기상학적 가뭄, 농업적 가뭄, 수문학적 가뭄으로 구분되어 가뭄지수를 활용한 평가가 이루어지고 있으나 환경가뭄 평가에 대해서는 미비한 실정이다. 수질오염총량제를 통해 관리되어지고 있는 하천 수질은 이러한 가뭄의 영향을 대비하는데 취약한 부분이 있다. 본 연구에서는 가뭄이 하천 수질에 미치는 영향을 파악하고 가뭄의 지속이 수질에 미치는 가뭄영향을 정량화 하고자한다. 무강우일수, 누적강수량이 하천 수질에 미치는 영향을 정량적으로 평가하였다. 하천의 수질을 평가하는데 활용되는 부하지속곡선(Load Duration Curve, LDC)를 활용하여 특정 시기에 발생하는 수질오염을 평가하였다. 감천중권역에서는 무강우일수가 14일 이상 지속되는 경우 중권역 목표수질을 초과하는 경우가 60%이상으로 나타났다. 누적강우량은 28일을 기준으로 설정하였을때 연간 평균강수량의 3%인 32.1 mm 이하인 경우에 하천에서의 수질변화가 나타났다. 감천 중권역에서는 무강우일수 14일, 28일간 누적강우량이 32.1 mm 이하를 기준으로 기상학적 영향이 목표수질 초과에 영향을 미친다고 판단하였다. 본 연구의 결과를 통해 가뭄영향을 정량화하고 향후 환경가뭄에서의 수질환경 가뭄지수 개발에 기여하고자 한다.

• 한국전산구조공학회논문집
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• 제32권4호
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• pp.205-213
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• 2019

2017년 발생한 포항 지진으로 인하여 천장재, 외장재, 커튼월 등 비구조재의 파괴에 의한 피해가 다수 보고되었으며 비구조재의 내진설계가 중요해지고 있다. 본 연구에서는 임팩트해머 테스트를 통해 행어볼트 길이에 따른 천장재의 고유진동수와 감쇠비를 식별하였다. 또한 천장재가 벽 또는 다른 구조체에 충돌하는 경우 발생하는 충격효과를 정확히 고려하기 위해 충돌실험을 수행하였다. 식별된 천장재의 동특성과 충격지속시간을 바탕으로 실제로 천장재가 지진하중으로 인하여 주변 구조물과 충돌이 발생하는 경우에 대한 천장재 응답특성을 수치해석을 통하여 분석하였다. 수치해석 시뮬레이션 결과, 충격하중은 이격거리에 따라 선형적으로 증가하는 경향을 보였으며, 달대길이와는 무관한 것으로 나타났다.

• 동아시아식생활학회지
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• 제19권2호
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• pp.278-286
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• 2009

Restaurants have two strategic levers for revenue management: duration control and demand-based pricing. Reducing dining times, especially during peak periods, can add considerable revenue for restaurants. Managing meal duration, however, can be far more complex than manipulating the price. This paper examines dining duration expectations for restaurants types(Family, Korean, Quick service restaurant), customers characteristics(gender, age, occupation, meal period, visiting frequency, dining occasion, dining companions) using an a adaptation of a price sensitivity measurement tool, naming it 'Time Sensitivity measurement tool' or TSM. The TSM is then used to derive the optimal time points, and the range of acceptable times. The results demonstrate that there is a relatively wide spread of acceptable dining duration times in family restaurant. Furthermore, the optimal time points was shorter than the mean expected dining times, which suggests that many restaurants may be able to shorten dining duration without compromising customer satisfaction. The paper explores whether demographic and dining variables have an impact on time preferences, and finds whether gender, age, meal periods, visiting frequency, and dining companion effects are significant. Specifically, women in their thirties tended to prefer a significantly longer dining times for dinner.

• 한국건설관리학회논문집
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• 제6권5호
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• pp.69-77
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• 2005

Change is inevitable and is a reality of construction projects. Most construction contracts include change clauses and allowing contractors an equitable adjustment to the contract price and duration caused by change. However, the actions of a contractor can cause a loss of productivity and furthermore can result in disruption of the whole project because of a cumulative or ripple effect. Because of its complicated nature, it becomes a complex issue to determine the cumulative impact (ripple effect) caused by single or multiple change orders. Furthermore, owners and contractors do not always agree on the adjusted contract price for the cumulative Impact of the changes. A number of studies have attempted to quantify the impact of change orders on project costs and schedule. Many of these attempted to develop regression models to quantify the loss. However, regression analysis has shortcomings in dealing with many qualitative or noisy input data. This study develops ANN models to classify and quantify the labor productivity losses that are caused by the cumulative impact of change orders. The results skew that ANN models give significantly improved performance compared to traditional statistical models.

• 소음진동
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• 제8권3호
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• pp.513-523
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• 1998

Impact response of a vibro-impact system and its contact mechanism was studied. The vibro-impact system is composed of a small secondary system is constrained to move along a slot of fixed length in a large primary system. The contact mechanism is characterized by its coefficient of restitution. Numerical simulation analysis has been used to determine the time-history and the impact statistics of the primary and secondary systems. Input excitation of the primary system was random, and the responses obtained were the velocities of the primary and secondary system, the closing velocity in time axis and the duration time between impacts. The validity of the numerical simulation method was checked by comparing the results with those obtained by other researchers analytically. It is shown that the results obtained by the nemerical simulation analysis showed a good agreement with those for the analytical method.