• Proceedings of the IEEK Conference
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• 2000.07a
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• pp.541-544
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• 2000

This paper presents a multitier GIS architecture to adapt to large-scale distributed networks and to improve data transfer performance with intelligent caching technique. We design this system using UML based on object-oriented analysis. We show some advantages in our proposed system against the ordinary GIS, in special, suitability to distributed networks.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.686-688
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• 2003

워크플로우 시스템의 핵심을 이루고 있는 엔진의 효율성을 극대화 시키기 위하여, 워크플로우 시스템 엔진 안에서 운용되는 데이터의 관리는 매우 중요하다. 본 논문에서는 워크를로우 시스템에서 운용되는 각 시스템 데이터의 특징을 고찰 한 후, 일반적으로 사용하는 데이터 베이스 시스템 호출을 통해 데이터를 관리하는 방법을 보완 할 수 있는 방법을 제시한다. 그 방법으로 각 시스템 데이터가 가지고 있는 특성에 맞추어 기존의 데이터 베이스 호출을 통한 방법에 메모리에 데이터를 로드시켜 공용적으로 사용하는 방법을 더해 시스템 데이터를 관리하는 방법을 기술한다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.382-384
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• 2003

IMF 이후 기업들은 구조조정을 통한 체질개선에 총력을 기울임과 동시에 그 동안의 외형적 성장에서 탈피하여 투자 자본의 효율 향상을 위해 기업가치를 극대화하려고 노력하고 있다. 따라서. 각 사업체의 중점 육성 부분과 매각 부분을 선별하게 되었으며, 이해 사 간의 인수 합병이 빈번히 일어나고 있다. 그러나, 이렇게 생성된 기업체의 경우, 기존 전산 시스템의 하드웨어, 소프트웨어, 데이터베이스 등의 불일치로 통합에 많은 시간과 비용이 발생하고 있다. 따라서, 본 논문에서는 기존 전산 시스템의 플랫폼 불일치를 극복하며, 기존 시스템으로부터 개발되는 새로운 시스템으로의 전이를 자연스럽게 해줄 플랫폼 독립적인 대용량 데이터 동기화 서버(SyncDB2DB)를 설계한다.

• Annual Conference of KIPS
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• 2009.11a
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• pp.215-216
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• 2009

본 논문에서는 그리드 환경에서 대규모의 분산 데이터 분석 환경을 제공하고자 한다. 기존의 접근방식으로서 자원 성능 기반의 사전 예약 기법인 Push 기법과 가용자원이 능동적으로 작업을 가져오는 Pull 방식을 조합하여 분산 효율과 실행 시간을 최소화 하는 기법을 제안하고자 한다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 1997.11a
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• pp.297-304
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• 1997

Sphere anemometry technique is re-visited for low gas velocity measurements during full-scale fire tests. This technique has the advantage of requiring only one channel per sphere for data acquisition, in addition to being cheap and rugged, The results indicate that the technique is useful for small fuel load burns with low radiation levels. For large fuel loads, the usefulness is up to sprinkler activation temperatures.

• Journal of Korea Multimedia Society
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• v.20 no.2
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• pp.352-362
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• 2017

This paper proposes an algorithm for automatically converting and displaying rainfall radar data on a 3D GIS platform. The weather information displayed like rainfall radar data is updated frequently and large-scale. Thus, in order to efficiently display the data, an algorithm to convert and output the data automatically, rather than manually, is required. In addition, since rainfall data is extracted from the space, the use of the display image fused with the 3D GIS data representing the space enhances the visibility of the user. To meet these requirements, this study developed the Auto Data Converter application that analyzes the raw data of the rainfall radar and convert them into a universal format. In addition, Unity 3D, which has good development accessibility, was used for dynamic 3D implementation of the converted rainfall radar data. The software applications developed in this study could automatically convert a large volume of rainfall data into a universal format in a short time and perform 3D modeling effectively according to the data conversion on the 3D platform. Furthermore, the rainfall radar data could be merged with other GIS data for effective visualization.

• Journal of Biosystems Engineering
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• v.33 no.5
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• pp.362-369
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• 2008

There is developing interest in precision agriculture in Korea, despite the fact that typical Korean fields are less than 1 ha in size. Describing within-field variability in typical Korean production settings is a fundamental first step toward determining the size of management zones and the inter-relationships between limiting factors, for establishment of site-specific management strategies. Measurements of rice (Oriza Sativa L) yield, chlorophyll content, and soil properties were obtained in a small (100-m by 30-m) Korean rice paddy field. Yield data were manually collected on 10-m by 5-m grids (180 samples with 3 samples in each of 60 grid cells) and chlorophyll content was measured using a Minolta SPAD 502 in 2-m by 2-m grids. Soil samples were collected at 275 points to compare results from sampling at different scales. Ten soil properties important for rice production in Korea were determined through laboratory analyses. Variogram analysis and point kriging with and without median polishing were conducted to determine the variability of the measured parameters. Influence of variogram model selection and other parameters on the interpretation of the data was investigated. For many of the data, maximum values were greater than double the minimum values, indicating considerable spatial variability in the small paddy field, and large-scale spatial trends were present. When variograms were fit to the original data, the limits of spatial dependency for rice yield and SP AD reading were 11.5 m and 6.5 m, respectively, and after detrending the limits were reduced to 7.4 m and 3.9 m. The range of spatial dependency for soil properties was variable, with several having ranges as short as 2 m and others having ranges greater than 30 m. Kriged maps of the variables clearly showed the presence of both large-scale (trend) variability and small-scale variability in this small field where it would be reasonable to expect uniformity. These findings indicate the potential for applying the principles and technology of precision agriculture for Korean paddy fields. Additional research is needed to confirm the results with data from other fields and crops.d similar tendency with the result for the frequency less than 20 Hz, but the width of change was reduced highly.

• Korean Journal of Remote Sensing
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• v.36 no.2_2
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• pp.325-335
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• 2020

Forest canopy height can be used for estimate of above-ground forest biomass (AGB) by means of the allometric equation. The remote locations and harsh conditions of mangrove forests limit the number of field inventory data stations needed for large-scale modeling of carbon and biomass dynamics. Although active and passive spaceborne sensors have proven successful in mapping mangroves globally, the sensors generally have coarse spatial resolution and overlook small-scale features. Here we generate a 12 m spatial resolution mangrove canopy height map from TanDEM-X data acquired over the world largest intact mangrove forest located in the Sundarbans. With single-pol. TanDEM-X data from 2011 to 2013, the proposed technique makes use of the fact that the double-bounce scattering that occurs between the water and mangrove trees yields water surface level elevation over mangrove forest areas, thus allowing us to estimate forest height with the assumption of an underlying flat topography. Our observations have led to a large-scale mangrove canopy height map over the entire Sundarbans region at a 12 m spatial resolution. Our canopy height estimates were validated with ground measurements acquired in 2015, a correlation coefficient of 0.83 and a RMSE of 0.84 m. With globally available TanDEM-X data, the technique described here will potentially provide accurate global maps of mangrove canopy height at 12 m spatial resolution and provide crucial information for understanding biomass and carbon dynamics in the mangrove ecosystems.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05a
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• pp.303-306
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• 2005

The cracking behavior of prestressed concrete members is important for the rational design of prestressed concrete structures. However, the test data on the cracking behavior of prestressed concrete structures are very limited. The purpose of the present study is to investigate the crack spacing and crack width in transversely post-tensioned decks of concrete box girder bridges under applied loading. For this purpose, large scale test members of concrete box girder segments were fabricated and tested. The crack widths, crack spacings and crack patterns were investigated for various load levels. The crack widths and steel strains were continuously monitored during the loading process. To derive a rational predicton equation for crack width, the bond characteristics of post-tensioned steel and nonprestressed rebar in the PSC members were explored first. This was done by measuring the strains of prestressing steel and nonprestressed rebar in the test members under loading. A simple equation for the prediction of maximum crack width in transversely post-tensioned concrete one-way slabs is proposed by considering bond characteristic of prestressing steel and nonprestressed reinforcement. The comparison of proposed equation with experimental data shows good correlation. The present study indicates that ACI and CEB-FIP code equations exhibit rather large deviation from test data on prestressed concrete members.

• Steel and Composite Structures
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• v.12 no.4
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• pp.325-350
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• 2012

Concrete filled steel hollow structural sections (CFSs) are an efficient, sustainable, and attractive option for both ambient temperature and fire resistance design of columns in multi-storey buildings and are becoming increasingly common in modern construction practice around the world. Whilst the design of these sections at ambient temperatures is reasonably well understood, and models to predict the strength and failure modes of these elements at ambient temperatures correlate well with observations from tests, this appears not to be true in the case of fire resistant design. This paper reviews available data from furnace tests on CFS columns and assesses the statistical confidence in available fire resistance design models/approaches used in North America and Europe. This is done using a meta-analysis comparing the available experimental data from large-scale standard fire tests performed around the world against fire resistance predictions from design codes. It is shown that available design approaches carry a very large uncertainty of prediction, suggesting that they fail to properly account for fundamental aspects of the underlying thermal response and/or structural mechanics during fire. Current North American fire resistance design approaches for CFS columns are shown to be considerably less conservative, on average, than those used in Europe.