Time filter

Source Type

Choi J.,Korea Land and Housing Corporation | Lee D.,Catholic University of Pusan | Jung H.,Korea Institute of Science and Technology
Lecture Notes in Electrical Engineering | Year: 2014

Different information related to knowledge should be collected and filtered by system in order to discover and integrate knowledge in multiple knowledge representation environment. Especially, various information exist in multiple forms and in separate spaces, such as geographic information, housing statistics, and policy statements, in housing planning doamin. Housing policy support system is needed to make a proper spatial decision for supply housing when housing demand is occured. Thus, this paper proposes a conceptual design of system for knowledge discovery and integration in housing planning support. This system uses GIS based Housing Demand and Supply Mapping Model (HDSMM) to support policy decision using housing statistics and geographic information and to be composed of multi-dimension analysis, policy monitoring functionalities. © Springer-Verlag Berlin Heidelberg 2014.

Kim H.T.,Korea Land and Housing Corporation | Kim S.B.,Chung Ang Aerosurvey Co. | Go J.S.,Chung Ang Aerosurvey Co. | Eo Y.D.,Konkuk University | Lee B.K.,Kyonggi University
Journal of Convergence Information Technology | Year: 2010

3D geospatial information is information which presents the real world, and contributes to quantitative analysis and decision making support of construction, forestry, disaster management etc. using integrated orthophoto, DEM, attribute data, 3D modeling and visualizing information. Multi-looking Aerial photogrammetric method, which is more efficient than traditional one, can save the expenditure of public sector and increase their efficiency, and can be applied to diverse applications of private sector. It is expected to be a one of the valuable national projects in time.

Lee H.,University of Texas at Arlington | Lee B.,Korea Land and Housing Corporation | Park K.,University of Texas at Arlington | Elmasri R.,University of Texas at Arlington
International Journal of Digital Content Technology and its Applications | Year: 2010

Information fused by multi-sensors is an important factor for obtaining reliable contextual information in smart spaces which use the pervasive and ubiquitous computing techniques. Adaptive fusion improves robust operational system performances then makes a reliable decision by reducing uncertain information. However, these fusion techniques suffer from problems regarding the accuracy of estimation or inference. No commonly accepted approaches exist currently. In this survey, we introduce the advantages and disadvantages of fusion techniques which can be used in specific applications. Second, we categorize well-known models, algorithms, systems, and applications depending on the proposed approaches. Finally, we discuss the related issues for fusion techniques within the smart spaces then suggest research directions for improving the decision-making in uncertain situation.

Lim S.-H.,Korea Land and Housing Corporation | Joo S.J.,Seoul National University | Yang K.-C.,Kongju National University
Journal of Ecology and Environment | Year: 2015

To clarify the effects of forest fire on the carbon budget of a forest ecosystem, this study compared the seasonal variation of soil respiration, net primary production and net ecosystem production (NEP) over the year in unburned and burned Pinus densiflora forest areas. The annual net carbon storage (i.e., NPP) was 5.75 t C ha-1 in the unburned site and 2.14 t C ha-1 in the burned site in 2012. The temperature sensitivity of soil respiration (i.e., Q10 value) was higher in the unburned site than in the burned site. The annual soil respiration rate was estimated by the exponential regression equation with the soil temperatures continuously measured at the soil depth of 10 cm. The estimated annual soil respiration and heterotrophic respiration (HR) rates were 8.66 and 4.50 t C ha-1 yr-1 in the unburned site and 4.08 and 2.12 t C ha-1 yr-1 in the burned site, respectively. The estimated annual NEP in the unburned and burned forest areas was found to be 1.25 and 0.02 t C ha-1 yr-1, respectively. Our results indicate that the differences of carbon budget and cycling between both study sites are considerably correlated with the losses of living plant biomass, insufficient nutrients and low organic materials in the forest soil due to severe damages caused by the forest fire. The burned Pinus densiflora forest area requires at least 50 years to attain the natural conditions of the forest ecosystem prior to the forest fire. © 2015 The Ecological Society of Korea. All rights are reserved.

Jang S.Y.,Korea Railroad Research Institute | Kim B.S.,Korea Land and Housing Corporation | Oh B.H.,Seoul National University
Cement and Concrete Research | Year: 2011

The purpose of the present study is to explore the diffusion characteristics of cracked concrete according to the width of cracks. Major test variables include crack width, concrete strength, fly ash addition, and maximum aggregate size. The diffusion characteristics have been measured by steady-state migration test. The present study indicates that the diffusion coefficients do not increase with increasing crack widths up to the so-called "threshold crack width." The threshold crack width for diffusion is found to be around 55-80 μm. Above this threshold value, the diffusion coefficients start to increase with crack width. A composite model with the introduction of "crack geometry factor" was derived to identify the diffusion coefficient in cracked concrete. It was shown that the crack geometry factor ranges from 0.067 to 0.206. Finally, the effects of concrete strength, fly ash addition and maximum aggregate size on diffusion coefficients are also discussed. © 2010 Elsevier Ltd.

Discover hidden collaborations