• 한국멀티미디어학회논문지
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• 제6권3호
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• pp.429-435
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• 2003

본 논문에서는 인간의 시각 특성의 하나인 공간 지각 특성을 고려하여 고유벡터를 이용한 이진 트리 벡터양자화를 하는 개선된 양자화 기법을 제안한다. 제안 방법은 고유벡터를 이용한 이진 트리 벡터 양자화의 두노드로 분할하는 과정에 영상의 블록 내 칼라 변화에 따른 시각 시스템의 특성을 가중치로 결합하여 양자화를 하였다. 그리고 원영상의 밝기성분과 양자화영상의 밝기성분의 차영상을 이용해 MTF(modulation transfer function)를 고려하여 양자화 영상의 화질을 평가한다. 제안 방법은 적은 레벨의 양자화된 영상을 구할 수 있었으며. 영상이 차지하는 자원을 효과적으로 감소시킬 수 있었다. 이는 기존의 방법보다 색상이 선명해지며 유사한 영역의 분할에 뛰어난 성능을 보여주었다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.598-601
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• 2006

Satellite imagery may contain large regions covered with atmospheric aerosol. A high-resolution satellite imagery affected by non-homogenous aerosol cover should be processed for land cover study and perform the radiometric calibration that will allow its future application for Korea Multi-Purpose Satellite (KOMPSAT) data. In this study, aerosol signal was separated from high resolution satellite data based on the reflectance separation method. Since aerosol removal has a good sensitivity over bright surface such as man-made targets, aerosol optical thickness (AOT) retrieval algorithm could be used. AOT retrieval using Look-up table (LUT) approach for utilizing the transformed image to radiometrically compensate visible band imagery is processed and tested in the correction of satellite scenery. Moderate Resolution Imaging Spectroradiometer (MODIS), EO-1/HYPERION data have been used for aerosol correction and AOT retrieval with different spatial resolution. Results show that an application of the aerosol detection for HYPERION data yields successive aerosol separation from imagery and AOT maps are consistent with MODIS AOT map.

• 한국지구과학회지
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• 제27권7호
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• pp.787-803
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• 2006

The drought index has been developed, based on a $8.6{\mu}m$ surface emissivity in the $8-12{\mu}m$ MODIS channels over the African Sahel region (10-20 N, 13 W-35 W) and the Seoul Metropolitan Area (SMA: 37.2-37.7 N, 126.6-127.2 E). The emissivity indicates the $SiO_2$ strength and can vary interannually by vegetation, water vapor, and soil moisture, as a potential indicator of drought conditions. In a well-vegetated region close to 10 N of the Sahel, the Normalized Difference Vegetation Index (NDVI) showed high sensitivity, while the emissivity did not. On the other hand, the NDVI experienced negligible variability in a poorly vegetated region near 20 N, while the emissivity reflected sensitively the effects of atmospheric water vapor and soil moisture conditions. Seasonal variations of the emissivity (0.94-0.97) have been examined over the SMA during the 2003-2004 period compared to NDVI (or Enhanced Vegetation Index; EVI). Here, the dryness was more severe in urban area with less vegetation than in suburban area; the two areas corresponded to the north and south of the Han river, respectively. The emissivity exhibiting a significant spatial correlation of ${\sim}0.8$ with the two indices can supplement their information.

• 한국패션뷰티학회지
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• 제6권1호
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• pp.60-72
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• 2008

A midst the tendency in an attempt to rehabilitate the coexistence of values in Oriental and Western cultures, along with centripetal attention through reincarnation of the Oriental culture, the modem fashion trend is also inclusive of such Oriental flavors even in the opposite Western fashion icons with an outlook for futuristic alternative. In this regard the study is to investigate the Oriental Characteristics shown in the contemporary fashion in a more profound and right manner by evaluating its spirituality and formativeness through analytical survey on preliminary literatures, whose key words are as follows; Fist, heterogeneity inclusive of the Oriental comprehensiveness through non-periodic chaos; second, imperfection in pursue of perfection through non-perfection; third, asymmetry caused by polarized historicity together with agility in the Oriental costumes; fourth, simplicity bridging into religious naught, and; fifth, spatial comfortablity shrouded by loose design. As a result, the study demonstrates that Oriental sensitivity implicative at the modem fashion, prior to its formativeness, shed out a clue of the Oriental profound spirits in its fashion style.

• 천문학회보
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• 제42권2호
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• pp.75.2-75.2
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• 2017

We Investigate dust stripping of Virgo cluster galaxies that are known to suffer HI gas stripping. The gas stripping phenomena of these galaxies may result from either ram pressure induced by the hot intracluster medium or gravitational tidal interactions between galaxies. While much efforts have been made to directly detect gas removed from cluster galaxies, the spatial distributions of dust, which should also be affected, are hardly known. Several previous studies have tried to directly detect the morphology of gas or dust using radio or infrared observations, but such approaches are hard to widely apply because of the limit of observational resolution and sensitivity. In this study, we try a different approach using optical data: measuring the background galaxy reddening by the dust stripped from the Virgo cluster members. Based on optical color excess maps of the background galaxies, we compare the ambient dust distribution with the HI morphology of the Virgo galaxies. We discuss how efficiently dust stripping can be detected with this method and how the stripped dust is associated with the removed gas according to HI gas stripping stage over the sample.

• 대기
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• 제16권4호
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• pp.319-332
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• 2006

This study examines the capability of the WRF (Weather Research and Forecasting) model in reproducing heavy rainfall that developed over the Korean peninsula on 26-27 June 2005. The model is configured with a triple nesting with the highest horizontal resolution at a 3-km grid, centered at Yang-dong, Gyeonggi-province, which recorded the rainfall amount of 376 mm. In addition to the control experiment employing realistic orography over Korea, two consequent sensitivity experiments with 1) no orography, and 2) no land over Korea were designed to investigate orographic effects on the development of heavy rainfall. The model was integrated for 48 hr, starting at 1200 UTC 25 June 2005. The overall features of the large-scale patterns including a cyclone associated with the heavy rainfall are reasonably reproduced by the control run. The spatial distribution of the simulated rainfall over Korea agreed fairly well with the observed. The amount of predicted maximum rainfall at the 3-km grid is 377 mm, which located about 50 km southeast from the observed point, Yang-Dong, indicating that the WRF model is capable of predicting heavy rainfall over Korea at the cloud resolving resolutions. Further, it was found that the complex orography over the Korean peninsula plays a role in enhancing the rainfall intensity by about 10%. The land-sea contrast over the peninsula was fund to be responsible for additional 10% increase of rainfall amount.

• 대한토목학회논문집
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• 제6권1호
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• pp.13-24
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• 1986

본(本) 논문(論文)에서는 북한강(北漢江) 수계(水系)의 소양강(昭陽江)댐 및 화천(華川)댐의 실시간(實時間) 홍수조절(洪水調節) 모형(模型)을 개발(開發)하였다. 그 방법으로는 feedforward-feedback control에 의한 Simulation기법은 사용하였다. 즉, 예측 유입량을 이용한 단일댐 운영방안에 의하여 구간 각 댐의 방류량으로부터 두 댐의 합류점(合流點)에서의 유량을 구한 후 Feedback control에 의하여 합류점(合流點)의 첨두 유량을 경감하도록 상류댐 방류량을 재조정하도록 하였다. 또한 개발(開發)된 모형(模型)에 관한 민감도(敏感度) 분석(分析)을 행하였다.

• 한국가구학회지
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• 제24권4호
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• pp.416-425
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• 2013

Luis Barragan's Architecture has creative feature that Mexican environment and traditional culture were complete by color. Thus the color of his work makes our emotions rich and colorful. He said "My architecture is autobiographical..." at speech in Pritz price. As we can see in his architectural philosophy that sentimental architecture is important than theorical system, his works are impression of empirical factor with intuition. "Color is a complement to the architecture. It serve to enlarge or reduce a space. It's also useful for adding that touch of magic a place needs", stated Barragan. During his process of shaping space, Barragan drew on color in the same way as an architectural component, according it a spatial funtion and expressive vale. he allied it with light, deeming it a crucial vehical for conveying the emotive attributes a site. The capacity of color to express sensitivity and sensuality within an architecture space is liked to its psycho-physiological qualities. In this kind of view, color featyre in Barragan's work is one of the most important tools to realize sentimental architecture, not only is result of the Mexican regional color. As a result, make focus on analyzing various meaning of the color in Barragan's architecture like poetic and habitable structure.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 추계학술대회 논문집
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• pp.449-452
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• 2007

The present study numerically investigate the effects of the Syngas chemical kinetics on the basic flame properties and the structure of the Syngas diffusion flames. In order to realistically represent the turbulence-chemistry interact ion and the spatial inhomogeneity of scalar dissipation rate. the Eulerian Particle Flamelet Model(EPFM) with multiple flamelets has been applied to simulate the combustion processes and NOx formation in the syngas turbulent nonpremixed flames. Due to the ability for interactively describing the transient behaviors of local flame structures with CFD solver, the EPFM model can effectively account for the detailed mechanisms of NOx format ion including thermal NO path, prompt and nitrous NOx format ion, and reburning process by hydrocarbon radical without any ad-hoc procedure. validation cases include the Syngas turbulent nonpremixed jet and swirling flames. Based on numerical results, the detailed discussion has been made for the sensitivity of the Syngas chemical kinetics as well as the precise structure and NOx formation characteristics of the turbulent Syngas nonpremixed flames.

• 한국가시화정보학회지
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• 제9권1호
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• pp.36-41
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• 2011

It is highly needed to measure the dissolved oxygen (DO) concentration field in water for a variety of purposes such as biological, industrial, environmental monitoring and medical application. Application of PSP (Pressure Sensitive Paint) which is sensitive to oxygen concentration has been carried out to measure DO concentration field using PtOEP/PS film and intensity based method under the UV-LEDs illumination. A micro round water jet having 100% of DO was obliquely impinged on to a PtOEP/PS film coated plate placed in a 0% of DO water container. DO concentration fields on the impinging plate were quantitatively visualized with a $2.94\;{\mu}m$ of spatial resolution. Through pixel-by-pixel calibration, uncertainty of each pixel by different sensitivity, different dye concentration and non-uniformity of illumination was removed. It is demonstrated that the high DO concentration region was coincided with the impingement area. The DO concentration gradient due to DO diffusion was affected by Reynolds number.