• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.408.1-408.1
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• 2016

현대 반도체 산업에서 소자의 집적도가 증가함에 따라 층간 절연막의 두께가 줄어들어 RC delay현상이 발생한다. 또한 유연성에 대한 요구도 증가하고 있다. 그 대안으로 저유전 SiO2 무기물, 유무기 복합체, 유기물 등이 크게 각광받고 있다. 본 연구는 SiO2 hollow sphere와 폴리이미드를 이용해 유무기복합체를 합성하고 유전율 측정 및 유연성 테스트를 진행한 내용을 담고있다. 먼저 폴리스티렌에 SiO2를 코팅한 후 폴리이미드 용액과 기계적으로 혼합시킨다. 이후 스핀코팅 및 열처리를 이용해 한단계로 복합체를 합성할수 있다. 합성된 복합체의 유전율은 최소 1.6에 가까운 수치를 나타낸다.

• The Journal of Engineering Geology
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• v.14 no.1
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• pp.21-28
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• 2004

Three-dimensional (3-D) resistivity inversion including a topographic effect can be considered theoretically to be the technique of acquiring the most accurate image in the interpretation of resistivity data, because it includes characteristic image that the actual subsurface structure is 3-D. In this study, a finite-element method was used as the numerical method in modeling, and the efficiency of Jacobian calculation has been maximized with sensitivity analysis for the destination block in inversion process. Also, during the iterative inversion, the resolution of inversion can be improved with the method of selecting the optimal value of Lagrange multiplier yielding minimum RMS(root mean square) error in the parabolic equation. In this paper, we present synthetic examples to compare the difference between the case which has the toprographic effect and the other case which has not the effect in the inversion process.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.51-55
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• 2016

유입유사량의 변화에 의한 하도의 지형변화를 파악하는 것은 하천을 복원하거나 유지하는데 중요하다. 본 연구에는 2차원 수치모형을 이용하여 상류에서 유입되는 유사량의 변화에 의하여 망상하천의 저수로 변화와 유사의 분급 특성을 분석하였다. 망상하천의 변화를 파악하기 위하여 하폭은 2.8 m이고, 수로 길이는 50 m로 설정하였다. 하상경사는 0.0125, 유량은 $0.014m^3/sec$로 설정하였다. 상류에서 공급되는 유사량은 평형상태의 유사량에 대하여 50%, 70%, 90%, 100%로 감소시켰다. 상류에서 공급되는 유사량이 감소할수록, 하상고는 감소하고 하상토 입경은 증가하였다. 또한 하도 단면에 대한 저수로의 수를 나타내는 망상하천 지수(Braiding Index)는 감소하였다. 이것은 하도의 저수로 수가 감소하는 것을 나타낸다. 유입 유사량이 감소할수록, 하도의 기복도가 감소하며, 이것은 하도의 역동성이 감소하는 것을 의미한다.

• Proceedings of the Korean Society for Rock Mechanics Conference
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• 2009.03a
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• pp.21-26
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• 2009

• Geophysics and Geophysical Exploration
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• v.5 no.1
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• pp.6-17
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• 2002

Refraction tomography was developed to interpret subsurface velocity structure easily in topographic conditions. It was applied to synthetic refraction data to find the factors for optimization of applicability of refraction tomography such as configuration of profiling and its length, spacing of geophones and sources and topographic conditions. Also, low velocity layer near VSP hole could be detected by joint inversion with refraction and VSP data. Continuity of subsurface velocity structure in two different spread lines for area of house land development was good in case of applying our algorithm and velocity structure was classified quantitatively to evaluate rippability for engineering works.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.31 no.1
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• pp.99-107
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• 2013

With the expansion of the development and use of surveying equipment recently, by the establishment of infrastructure for network RTK surveying of the NGII, network RTK surveying has been widely used in surveying industry. Currently, in public surveying regulations, site calibration with minimum 5 evenly spaced bench marks is needed for using network RTK surveying results as leveling. But the range between and the number of bench marks for site calibration can be varied according to the geoid undulation. In this study, in order to verify this, Incheon area having regular geoid undulation and Taebaek area having irregular geoid undulation are selected as study area and network RTK surveying have been done. Then the accuracy of site calibration by range between and the number of bench marks have been compared. As a result of this study, in order to meet a tolerance of vertical precision (0.1m) that has been set in public surveying regulations, there is a necessity for improving the regulations so that the range and number of bench marks, to be used for site calibration of network RTK surveying, can be applied complementarily.

• Korean Journal of Agricultural and Forest Meteorology
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• v.7 no.1
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• pp.66-77
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• 2005

We have investigated microclimatic controls on the spatiotemporal variations of net primary production (NPP) of a rugged forested watershed using the process-based biogeochemical model (BIOME-BGC). To validate the model simulation of water and carbon cycles at the plot scale, we have conducted field survey over deciduous broadleaf forest (DBF) and evergreen needleleaf forest (ENF) since 2000. The modeled values of soil temperature, soil moisture and soil respiration showed high correlation with those from the field measurements. The modeled seasonal changes of NPP showed high correlation with air temperature but no significant correlation with water related parameters. The precipitation frequency turned out to be the best climatic factor to explain the annual variation of NPP. Furthermore, NPP of ENF was more sensitive to precipitation frequency than that of DBF. With changes in vegetation cover and topography, the spatial distribution of NPP was of great heterogeneity, which was negatively correlated with the magnitude of NPP. Despite the annual precipitation of 1,400mm, NPP at the study site was constrained by the amount of water available for the vegetation. Such a modeling result should be verified by the field measurements.

• Journal of The Geomorphological Association of Korea
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• v.17 no.3
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• pp.49-57
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• 2010

The topographical rolling distribution characteristics of 10 geological areas in Gyeongsangbuk-do are analyzed using GIS. PEs, PEgrgn, Pp₂, Kav·Kiv, and Khgr regions occupy the more than 60% that are a steep slope-a high elevation and a steep slope-a middle elevation region, and form high moutains in Gyeongsangbuk-do. Meanwhile, Ke_1-9 and Te_1-2 regions take possession of the more than 70% that are a low elevation region. Ke_1-9 region form landward flatlands and hills around Nakdong river and tributaries of Nakdong river in Gyeongsangbuk-do. Then, Te_1-2 region form coastal lowlands adjacent the East sea in Gyeongsangbuk-do. Also, Jgr region take possession of the more than 70% that are a middle elevation region, and form low moutains or flatlands in Gyeongsangbuk-do. Finally, Ols₁ region take possession of the more than 50% that are a steep slope region, and form landward moutains in Gyeongsangbuk-do.

• (The) Research of the performance art and culture
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• no.20
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• pp.309-338
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• 2010

This article is about seeking for modern festival possibility of Mudang gut with noticing a festival essence of it. Several components and process of performing Maeul gut can be a festival. But the recent condition of gut pan obstructs becoming a festival. Above of all, distorted eyes on Mudang gut deny a festivity. Transition into seeking for private fortune and the duplicity of concealing a Mudang gut have weakened a festivity of Mudang gut. Maeul gut becomes a ceremony with unequal distribution of support fund and the support fund on intangible cultural assets. Therefore, we should consider Mudang gut as a game. People need to change their preception as a performance that people can actively take part in. Mudang gut need a active participants not bystanders. When people consider them selves as actors, Mudang gut will be a festival.

• 한국약용작물학회:학술대회논문집
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• 2007.05a
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• pp.261-262
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• 2007