• Annual Conference of KIPS
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• 2005.05a
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• pp.43-46
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• 2005

다차원 분석을 위한 OLAP 연산에서는 사용자의 요청에 빠르게 응답하기 위해 집계 값을 미리 계산하여 저장해 두는 사전 집계 방식을 이용한다. 시공간 데이터에 대한 사전 집계 기법으로는 R-트리의 각 노드에 대한 과거 집계 값을 요약 테이블로 관리하는 기법과 R-트리의 노드에서 현재 집계 값을 관리하는 기법이 있다. 그러나 이 기법들은 현재와 과거 모두의 집계 정보를 필요로 하는 시스템에서는 성능이 저하되며, 특히 과거 집계 정보의 경우 시간에 따른 계층화가 되어있지 않아 시간에 대한 계층 분석에 어려움이 있다. 본 논문에서는 시공간 데이터의 현재와 과거 집계 정보를 효율적으로 관리하는 기법을 제안한다. 제안 기법은 aR-tree를 이용하여 해당 영역에 대한 현재 집계 정보를 저장하고, 각 노드에 과거 집계 정보에 대한 연결을 위하여 링크를 추가하였다. 과거 집계 정보는 각 노드의 과거에서 현재까지의 집계 정보를 계층 구조로 유지하는 시간 요약 집계 테이블을 만들어 저장한다. 따라서 제안한 기법은 현재와 과거 집계 정보를 모두 유지할 수 있으므로 현재와 과거 집계 정보에 대한 처리 성능을 향상시킨다. 또한 제안 기법에서는 공간 정보를 공간 인덱스인 R-트리로 유지하고, 과거로부터의 시간 정보를 시간 요약 집계 테이블을 이용하여 계층화시켜 유지하므로 시간과 공간에 대한 계층 분석이 용이하다.

• Computers and Concrete
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• v.26 no.1
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• pp.95-106
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• 2020

Castellated beams fabricated from standard I-sections are being used for several structural applications such as commercial and industrial buildings, multistory buildings, warehouses and portal frames in view of numerous advantages. The advantages include enhanced moment of inertia, stiffness, flexural resistance, reduction in weight of structure, by passing the used plate girders, the passage of service through the web openings etc. In the present study, experimental and numerical investigations were carried out on concrete encased steel castellated beams with hexagonal openings under flexural loading. Various positions of openings such as along the neutral axis, above the neutral axis and below the neutral axis were considered for the study. From the experimental findings, it has been observed that the load-carrying capacity of the castellated beam with web opening above neutral axis is found to be higher compared to other configurations. Nonlinear finite element analysis was performed by using general purpose finite element software ABAQUS considering the material nonlinearities. Concrete damage plasticity model was employed to model the nonlinearity of concrete and elasto-plastic model for steel. It has been observed that FE model could able to capture the behaviour of concrete encased steel castellated beams and the predicted values are in good agreement with the corresponding experimental values.

• Mycobiology
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• v.37 no.3
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• pp.215-217
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• 2009

Sixty four samples of cocoa beans replicated in quadruplicates were collected from five warehouses from southwest Nigeria and examined for fungal loads, ergosterol and eohratoxin A The levels of all the variables obtained were further used as indices for cocoa grading into food quality, FoQ (erg < 5 mg/kg; OTA < $1{\mu}g$/kg), feed quality, FeQ (erg = $5{\sim}10\;mg$/kg; OTA in the range of $1.1{\sim}3.11{\mu}g$/kg), Screen for mycotoxin, SFM (erg = $10{\sim}20\;mg$/kg; OTA from $3.12{\mu}g$/kg and above) with fuel quality, FuQ having erg > 20 mg/kg and OTA > $6.12{\mu}g$/kg. Using these ergosterol indices, 18.75% of the cocoa beans examined was classified with the FoQ, 18.75% with the FuQ while 31.25% was classified with both the FeQ and the SFM, respectively. In conclusion, ergosterol can be used as a rapid index to grade fermented, dried cocoa beans meant for export.

• Journal of the Korea Society of Computer and Information
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• v.10 no.1 s.33
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• pp.7-14
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• 2005

An OLAP(On-Line Analytical Processing) system is the decision support tool with which a user can analyze the information interactively in the various aspects. However, the traditional existing construction of an OLAP system has the inefficiency Problem of increasing the processing time and cost caused by the use of complex MDX(Multidimensional Expressions) queries. In an attempt to solve this problem, a new concept of data structuring technique, where a unit column whose elements are all 1 is added to the fact table, was suggested. With the data structuring technique, we can reduce the processing time and cost in OLAP systems.

• Journal of architectural history
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• v.21 no.5
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• pp.7-18
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• 2012

On behalf of the royal women, SangGung(尙宮:The head of female servants in the palace) and NaIns(內人: Female servants caring for royal families in the palace) were dispatched in order to attend a funeral at the royal tomb. The NaInGaGa(內人假家) is the temporary building for SangGung and NaIns in the royal tomb. It is comprised of lodgings for them and also workrooms and warehouses to prepare ritual offering for the dead King or Queen. In the early Joseon dynasty, the NaInGaGa was utilized until a funeral at the royal tomb. Since 1674, NaInGaGa for the 3 years-period lamentation was started constructing separately. At these processes, the plan and placement of NaInGaGa was changed. This study based on the SanReungDoGam-EuiGwae (山陵都監-儀軌: The report on constructing royal tomb). The SanReungDoGam-EuiGwae written since 1800 have illustration about NaInGaGa. The illustration and explanation about NaInGaGa become a important clue that make suppose detailed space of NaInGaGa.

• Journal of the Korean housing association
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• v.17 no.6
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• pp.141-148
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• 2006

The purpose of this study is to investigate tendencies on land use in the housing site development district by grasping the characteristics of changes of building use at the borders of single-detached housing area for planning single-detached housing area in the future. It is divided the borders of detached housing areas into three types, educational facility, parks and green spaces, and apartment complex, and then analyzed the characteristics of each location after a field study. It is summarized as follows. First, there were stationery and flour-based meal stores in adjacent borders near educational facilities, suitable for students' interest and motion patterns, and it is required to consider about frequent children's action in the street. Second, there are many facilities for park users and residents, such as educational institutes and restaurants in adjacent to borders near parks. In borders neighboring buffer green belt areas, warehouses and vacant sites were mainly distributed. And the revitalization of streets was lower than others, because a road was used as a parking space. Third, there were realty dealers, food stores, and laundries which provide the dwellers with service in adjacent borders near multi-family housing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.685-687
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• 2013

Today, as wireless communications devices such as laptops, smart phones are generalized, wireless LAN has been widely installed in the corporate office conference rooms, industrial warehouses, Internet-ready classrooms, and even in a coffee shop. Though a wired network can be accessed and attacked only by the physical penetration, the wireless network which can be accessed anywhere within the reach of anyone has relative vulnerability by unauthorized users' attack. To defend these vulnerabilities, the introduction of WIDS / WIPS is required. In this paper, we recognize the limitations of WLAN security technology, review the current technology trends and propose the solutions in the future security problems.

• Journal of Navigation and Port Research
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• v.33 no.7
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• pp.477-482
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• 2009

In this paper the order picking problem in warehouses is considered, a topic which has received considerable attention from the international academic body in recent years. The order picking problem deals with the retrieval of order items from prespecified locations in the warehouse, and its objective is usually the minimization of travel time or travel distance. Hence, a well-thought order picking policy in combination with an appropriate storage policy will enhance warehouse efficiency and reduce operational costs. This paper starts with a literature overview summarizing approaches to routing order pickers, assigning stock-keeping units to pick locations and designing warehouse layouts. Since the layout design might affect both storage and routing policies, the three factors are interdependent with respect to order picking performance. To test these interdependencies, a simulation experiment was set up, involving two types of warehouse layout, four types of storage policy, five well-known heuristics and five sizes of order picking list. Our results illustrate that from the point of view of order picking distance minimization it is recommended to equip the warehouse with a third cross aisle, although this comes at the cost of a certain space loss. Additionally, we propose a set of most appropriate matches between order picking heuristics and storage policies. Finally, we give some directions for further research and recommend an integrated approach involving all factors that affect warehouse efficiency.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.251-252
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• 2015

Recently, as warehouses became automated, workers are trying to maximize storage efficiency as well as work efficiency. So, using mobile-rack which has wheels or rails at the bottom and minimizes dead space by removing extra passages between racks is rapidly rising as a notable technology. So, this paper seeks how to manage optimally cryogenic warehouse using mobile-rack. At first, routes of mobile-rack and operation vehicle will be synchronized and storage location will be decided with seasonal demand. After that, it will be simulated considering additional factors.

• Journal of architectural history
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• v.23 no.2
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• pp.7-24
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• 2014

The purpose of this research is to clarify the valuable industrial heritages of rice mill industry complex remained in Incheon. In order to clarify the formation of integrated historical setting of rice mill industry of Incheon, we analyzed the old map of Incheon's old Jemulpo area and data on address, locations and happenings surrounding rice mill factories and relevant facilities. From here, we could find out the 4 representative rice mill industry area of integrated historical setting and 2 other supporting service area for rice mill industry in old city center of Incheon. Specifically, we could figure out the incremental stages to establish the rice mill industry in Incheon. In the first stage, the rice mill factories were established near foreign settlement area where trading offices and warehouses were equipped. And the second stage reflect the needs of expanding area for Japanese capitalism with the new landfill area. In the final stage, Korean rice mill owners established the korean laborers community near Korean residential area. This formation of integrated historical setting reflecting Incheon's rice mill industry is the identical industrial heritages and urban structures to show the tension and conflict between Japanese and Korean laborers' life in the Japanese Colonial Period.