• 한국시뮬레이션학회논문지
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• 제10권3호
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• pp.71-82
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• 2001

Considering material handling delay which occurs between storage and processing stations, we propose an algorithm to estimate the required storage capacity, i.e., number of aisles and number of openings in vertical and horizontal directions in each aisle, of an automated storage/retrieval(AS/R) system. Due to the random nature of storage and retrieval requests, proportion of single and dual commands is not known in advance. Two design criteria, maximum permissible overflow probability and maximum allowable storage/retrieval(S/R) machine utilization, are used to compute the storage capacity. Most of studies assume that storage capacity of AS/R systems is given, although it is a very important decision variable in the design phase. Therefore, the proposed model can be effectively used in the design phase of new AS/R systems.

• 한국공간구조학회논문집
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• 제22권1호
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• pp.59-66
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• 2022

In this paper, the flexural capacity equation of FRP-bar reinforced concrete beams was verified by comparing the experimental results and flexural capacity obtained according to the ACI procedure. And, also the economic feasibility of FRP-bar reinforced concrete beams was analyzed by comparing nominal moment capacity of beams. The results of analysis were as follows, 1) GFRP concrete beams have lower flexural performance than reinforced concrete beams, whereas CFRP concrete beams have similar flexural performance to reinforced concrete beams under the same reinforcement ratio 2) Although the design moment increased as the compressive strength of concrete increased, the flexural performance of GFRP reinforced concrete beams was found to be lower than the reinforced concrete beams for all reinforcement ratios.

• 한국실내디자인학회논문집
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• 제15권6호
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• pp.139-149
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• 2006

Because of economic growth and the social trend to respect individuality, people's average commodity volume tends to increase. It makes people perceive the importance of storage space. The storage planning without consideration of commodity volume in the apartment can not satisfy the needs of residents. This study is developed focused on the $85m^2$ apartment which is the most representative and general type. The objectives of the study are to investigate the storage-capacity of $85m^2$ apartment offered by 4 construction companies to know the present storage condition, to investigate the average volumes and type of commodities in 30 families located in Seoul and Kyungkido to produce the necessary storage-capacity, and lastly to produce optimal storage-capacity and proportion of optimal storage-capacity considering the volume of the furniture owned by each resident. The results of the study are 1) the storage capacity for commodity volume in $85m^2$ apartment is $19.41m^3$. 2) the optimal storage-capacity which only counts the storage volume of built-in furniture is $17.14m^3$ 3) the proportion of optimal storage-capacity is 9.5% of the house-capacity.

• 한국지진공학회논문집
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• 제10권5호
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• pp.85-97
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• 2006

성능보장설계는 교각이 완전한 소성회전성능을 발휘할 때까지 다른 구조요소들과 교각 자체가 취성파괴 되지 않도록 설계하여 교량 전체 시스템의 연성파괴를 보장하기 위한 것으로서, 현행 도로교설계기준에는 명시적으로 규정되어 있지 않으나 대부분의 외국 교량내진설계기준에 채택되어 있다. 성능보장설계에서는 철근콘크리트 교각의 휨 초과강도를 구하고 이를 변환한 전단력을 교각, 기초, 말뚝에 작용하는 횡하중 설계전단력으로 결정하여 교각의 전단설계, 기초설계, 말뚝설계를 수행하도록 규정한다. 이 때 교각의 최대 소성모멘트를 결정하는 방법은 설계기준별로 각기 다른데, 이는 각 국의 재료 시공환경이 다르기 때문이다. 본 연구에서는 국내에서 사용하는 철근의 인장강도 측정치 3,407개와 콘크리트 압축강도 측정치 5,405개의 분석을 통하여 재료 초과강도계수를 제안하였고, 이를 적용하여 휨 초과강도를 결정하는 방법을 제시하였으며, 1,500개의 교각단면에 대한 모멘트-곡률 해석을 수행한 후 통계분석을 통하여 우리나라 실정에 적합한 초과강도계수를 제안하였다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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• pp.464-470
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• 2005

The numerical analysis is carried out to identify the influence of design factors to shear capacity of cast-in-place (CIP) anchor in ACI 349 Code that is available for the design of fastening system at Nuclear Power Plant (NPP) in this study. The MASA program is used to develop the numerical analysis model and the developed numerical analysis model is verified on a basis of the various test data of CIP anchor. Both $l/d_o$ and $c_1/l$ we considered as design factors. As a result, the variation of $l/d_o$ has no influence on the shear capacity of CIP anchor but $c_1/l$ has a large influence on the shear capacity of CIP anchor, Therefore, it is proved that ACI 349 Code may give a non-conservative results compared with real shear capacity of CIP anchor according to $c_1/l$.

• 태양에너지
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• 제18권3호
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• pp.107-112
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• 1998

Basic design of a solar driven absorption cooling machine(SDACM) with a cooling capacity of 5 USRT was carried out. The SDACM is a single effect cycle driven by low temperature hot water from solar collectors. The SDACM design data were calculated by the steady state simulation program which was developed in this study The variation of COP and cooling capacity of the SDACM were investigated at different off-design conditions. Both the cooling capacity and the system COP were improved with decreasing cooling water temperature. If hot water temperature was increased, the cooling capacity was improved but the system COP was found to be decreased. The decrease of the system COP were basically caused by increased thermal loads in the system components.

• 한국농공학회지
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• 제44권7호
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• pp.36-45
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• 2002

Most of rural bridges have passed 30 years of age since they were built, which have to support unexpected overload caused by changed design load and excessive amount of transportation. For these rural bridges, repairs and replacements are needed. Even though there have been attempt to estimate the safety of existing bridges deteriorated with major defects, those approaches must rely on the observable damage and subsequent decisions are made subjectively. To avoid the high cost of rehabilitation, the bridge rating must correctly represent the present load-carrying capacity. Rating engineers use a methods such as Allowable Stress Design (ASD), Load Factor Design (LFD), and Load Resistance Factor Design (LRFD) to evaluate the bridge load carrying capacity. In this paper, the load rating methods are introduced, and it is illustrated how to use the load test data from literature survey. Load test is conducted to the bridge that was built 30 years ago in rural area. From load test results, new maintenance method is suggested instead of the bridge replacement.

• 한국지진공학회논문집
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• 제18권2호
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• pp.95-103
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• 2014

The current AISC341-10 standard specifiesa value of 0.02 radian for the minimum rotation capacity of connections for the intermediate steel moment frame system. However, despite of the advances realized in the domains of performance evaluation method and analysis method, research onthe minimum rotation capacity of the intermediate steel moment frame systemsatisfying the seismic performance has not been conducted in detail. In this study, the intermediate moment frame systemisdesigned with respect to current standards and the seismic performance in accordance with the rotational capacity of connections is evaluated using the seismic performance evaluation method presented in FEMA-P695. The minimum rotation capacity of intermediate steel moment frames required to satisfy seismic performance as well as the major design values affecting the seismic performance of moment frame areestimated. To that goal, the design parameters are selected and various target frames are designed. The analysis models of the main nonlinear elements are also developed for evaluating seismic performance. The resultsshow that the 20-story structure doesnot meet the seismic performance even if it satisfies the rotation capacity of 0.02 radian.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.133-134
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• 2020

The equation of end bearing capacity is applied differently depending on the type of pile, construction method, and load characteristics considering the construction standards. The bearing capacity equation of the design standard is presented in various ways according to the design conditions such as construction method and ground condition, etc. but, It does not reflect the ground strength according to the SPT-N value of weathered rock. This study analyzed the trend of allowable tip bearing capacity by pile diameter through about 480 dynamic loading tests conducted for the construction/quality management of piles for the last 6 years since 2015. The equation for the ultimate end bearing capacity per unit area according to the SPT-N value is presented. The proposed formula of ultimate end bearing capacity per unit area can be applied in the range of 15,000kN/m2 to 30,000kN/m2. The proposed formula, which complements the existing formula, enables pile design and construction/quality management.

• Korean Chemical Engineering Research
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• 제55권6호
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• pp.745-753
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• 2017

본 연구에서는 도시 개발에 따라 왜곡된 도시 물 순환을 LID 시설을 통하여 자연적인 물 순환으로 되돌리고자 하는 설계전략이 제안된다. 이는 도시 개발 전과 후의 유황곡선이 동일하게 유지되는 최적의 LID 시설 설계용량을 결정함으로서 구현된다. 부산 녹산 국가산업단지의 일부지역이 연구대상지역으로 선정되었으며, 다양한 토지이용시나리오 및 LID 시설 설계용량에 대한 강우유출수 모의를 위하여 EPA SWMM이 구축되었다. 연구대상지역이 개발이전에 임야지역 또는 농경지역이라 가정하였을 경우, 도시 개발 이후에도 유황곡선이 도시 개발 전과 동일하게 유지되기 위해서는 불투수지역의 7.3% 또는 5.5%를 생태저류지의 면적으로 할당해야 함을 확인하였다. 또한 지역별 강우특성에 따른 생태저류지 설계용량의 민감도 분석을 수행한 결과, 농경지역의 개발 시에는 불투수지역의 3.8~5.5% 정도의 설계용량이 필요한 것으로 나타남에 따라 지역별 강우특성에 따라 생태저류지의 최적용량이 유의하게 달라질 수 있음을 살펴볼 수 있었다. 반면에, 생태저류지 각 층별 깊이의 변화에 따른 설계용량의 민감도 및 처리대상구역의 크기에 따른 민감도를 분석한 결과, 생태저류지의 설계 제원 및 처리대상구역의 크기에 따른 최적설계용량의 민감도는 크지 않은 것으로 나타났다.