Physical modeling of baffles influence on landslide debris mobility   总被引：3，自引：3，他引：0  

C. W. W. Ng  C. E. Choi  D. Song  J. H. S. Kwan  R. C. H. Koo  H. Y. K. Shiu  K. K. S. Ho 《Landslides》2015,12(1):1-18

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Macrobenthos habitat mapping in a tidal flat using remotely sensed data and a GIS-based probabilistic model     

Choi JK  Oh HJ  Koo BJ  Lee S  Ryu JH 《Marine pollution bulletin》2011,62(3):564-572

This paper proposes and tests a method of producing macrofauna habitat potential maps based on a weights-of-evidence model (a probabilistic approach) for the Hwangdo tidal flat, Korea. Samples of macrobenthos were collected during field work, and we considered five mollusca species for habitat mapping. A weights-of-evidence model was used to calculate the relative weights of 10 control factors that affect the macrobenthos habitat. The control factors were compiled as a spatial database from remotely sensed data combined with GIS analysis. The relative weight of each factor was integrated as a species potential index (SPI), which produced habitat potential maps. The maps were compared with the surveyed habitat locations, revealing a strong correlation between the potential maps and species locations. The combination of a GIS-based weights-of-evidence model and remote sensing techniques is an effective method in determining areas of macrobenthos habitat potential in a tidal flat setting.  相似文献   

Multisite campaign on the open cluster M67 – I. Observations and photometric reductions     

D. Stello  T. Arentoft  T. R. Bedding  M. Y. Bouzid  H. Bruntt  Z. Csubry  T. H. Dall  Z. E. Dind  S. Frandsen  R. L. Gilliland  A. P. Jacob  H. R. Jensen  Y. B. Kang  S.-L. Kim  L. L. Kiss  H. Kjeldsen  J.-R. Koo  J.-A. Lee  C.-U. Lee  J. Nuspl  C. Sterken  R. Szabó 《Monthly notices of the Royal Astronomical Society》2006,373(3):1141-1150

We report on an ambitious multisite campaign aimed at detecting stellar variability, particularly solar-like oscillations, in the red giant stars in the open cluster M67 (NGC 2682). During the six-week observing run, which comprised 164 telescope nights, we used nine 0.6-m to 2.1-m class telescopes located around the world to obtain uninterrupted time series photometry. We outline here the data acquisition and reduction, with emphasis on the optimization of the signal-to-noise ratio of the low-amplitude (50–500 μmag) solar-like oscillations. This includes a new and efficient method for obtaining the linearity profile of the CCD response at ultrahigh precision (∼10 parts per million). The noise in the final time series is 0.50 mmag per minute integration for the best site, while the noise in the Fourier spectrum of all sites combined is 20 μmag. In addition to the red giant stars, this data set proves to be very valuable for studying high-amplitude variable stars such as eclipsing binaries, W UMa systems and δ Scuti stars.  相似文献   

SRAO CO observation of 11 supernova remnants in l=70∘ to 190∘     

Il-Gyo Jeong  Do-Young Byun  Bon-Chul Koo  Jea-Joon Lee  Jung-Won Lee  Hyunwoo Kang 《Astrophysics and Space Science》2012,339(2):389-399

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Estimating the spatial pattern of human-caused forest fires using a generalized linear mixed model with spatial autocorrelation in South Korea     

Hanbin Kwak  Joachim Saborowski  Si-Young Lee  Myoung-Soo Won  Kyo-Sang Koo 《International journal of geographical information science》2013,27(9):1589-1602

Most forest fires in Korea are spatially concentrated in certain areas and are highly related to human activities. These site-specific characteristics of forest fires are analyzed by spatial regression analysis using the R-module generalized linear mixed model (GLMM), which can consider spatial autocorrelation. We examined the quantitative effect of topology, human accessibility, and forest cover without and with spatial autocorrelation. Under the assumption that slope, elevation, aspect, population density, distance from road, and forest cover are related to forest fire occurrence, the explanatory variables of each of these factors were prepared using a Geographic Information System-based process. First, we tried to test the influence of fixed effects on the occurrence of forest fires using a generalized linear model (GLM) with Poisson distribution. In addition, the overdispersion of the response data was also detected, and variogram analysis was performed using the standardized residuals of GLM. Second, GLMM was applied to consider the obvious residual autocorrelation structure. The fitted models were validated and compared using the multiple correlation and root mean square error (RMSE). Results showed that slope, elevation, aspect index, population density, and distance from road were significant factors capable of explaining the forest fire occurrence. Positive spatial autocorrelation was estimated up to a distance of 32 km. The kriging predictions based on GLMM were smoother than those of the GLM. Finally, a forest fire occurrence map was prepared using the results from both models. The fire risk decreases with increasing distance to areas with high population densities, and increasing elevation showed a suppressing effect on fire occurrence. Both variables are in accordance with the significance tests.  相似文献   

The role of AGN in the colour transformation of galaxies at redshifts z≈ 1     

A. Georgakakis †  K. Nandra  R. Yan  S. P. Willner  J. M. Lotz  C. M. Pierce  M. C. Cooper  E. S. Laird  D. C. Koo  P. Barmby  J. A. Newman  J. R. Primack  A. L. Coil 《Monthly notices of the Royal Astronomical Society》2008,385(4):2049-2060

We explore the role of active galactic nuclei (AGN) in establishing and/or maintaining the bimodal colour distribution of galaxies by quenching their star formation and hence, causing their transition from the blue to the red cloud. Important tests for this scenario include (i) the X-ray properties of galaxies in the transition zone between the two clouds and (ii) the incidence of AGN in post-starbursts, i.e. systems observed shortly after (<1 Gyr) the termination of their star formation. We perform these tests by combining deep Chandra observations with multiwavelength data from the All-wavelength Extended Groth strip International Survey (AEGIS). Stacking the X-ray photons at the positions of galaxies  (0.4 < z < 0.9)  not individually detected at X-ray wavelengths suggests a population of obscured AGN among sources in the transition zone and in the red cloud. Their mean X-ray and mid-infrared (IR) properties are consistent with moderately obscured low-luminosity AGN, Compton thick sources or a mix of both. Morphologies show that major mergers are unlikely to drive the evolution of this population but minor interactions may play a role. The incidence of obscured AGN in the red cloud (both direct detections and stacking results) suggests that black hole (BH) accretion outlives the termination of the star formation. This is also supported by our finding that post-starburst galaxies at z ≈ 0.8 and AGN are associated, in agreement with recent results at low z . A large fraction of post-starbursts and red cloud galaxies show evidence for at least moderate levels of AGN obscuration. This implies that if AGN outflows cause the colour transformation of galaxies, then some nuclear gas and dust clouds either remain unaffected or relax to the central galaxy regions after quenching their star formation.  相似文献   

Influence of acid mine drainage on microbial communities in stream and groundwater samples at Guryong Mine,South Korea   总被引：1，自引：0，他引：1  

Jaisoo Kim  So-Yeon Koo  Ji-Young Kim  Eun-Hee Lee  Sang-Don Lee  Kyung-Seok Ko  Dong-Chan Ko  Kyung-Suk Cho 《Environmental Geology》2009,58(7):1567-1574

The effects of acid mine drainage (AMD) in a stream and groundwater near an abandoned copper mine were characterized by physicochemical properties, bacterial community structure using denaturing gel gradient electrophoresis (DGGE), and microbial activity/diversity using Ecoplate technique. Based on DGGE fingerprints, the eubacterial community structures grouped into the stream water (GRS1, GRS2 and GRS3) and groundwater samples (GW1 and GW2), apparently based on differences in water temperature and the concentrations of dissolved oxygen, nitrate and sulfate. The most highly AMD-contaminated sample (GRS1) had additional α-Proteobacteria whereas the groundwater samples included additional β-Proteobacteria, suggesting the development of populations resistant to AMD toxicity under aerobic and anaerobic conditions, respectively. Community level physiological activities on the 31 Ecoplate substrates suggested that the activities decreased with increasing concentrations of sulfate and heavy metals derived from AMD. The Shannon index showed that microbial diversity was greatest in GRS2, and lowest in GRS1, and was probably related to the level of AMD.  相似文献   

Sediment reworking by a polychaete, <Emphasis Type="Italic">Perinereis aibuhitensis</Emphasis>, in the intertidal sediments of the Gomso Bay,Korea     

Bon Joo Koo  Jaehwan Seo 《Ocean Science Journal》2017,52(4):511-518

Bioturbation, especially sediment reworking by the activities of macroinvertebrates, such as feeding and burrowing, is one of the major processes that affect the physical, chemical, and biological characteristics of marine sediments. Given the importance of sediment reworking, this study was designed to evaluate the sediment reworking rate of a polychaete, Perinereis aibuhitensis, which is dominant in the upper tidal flats on the west coast of Korea, based on quantification of pellet production during spring and fall surveys. The density of individuals was higher in fall than in spring, whereas, due to a difference in the proportion of adults between the two seasons, the morphometric dimensions of the worm and its pellets were significantly longer and heavier in the spring. Hourly pellet production per inhabitant and density were closely related, with pellet production gradually decreasing as density increased. Daily pellet production was much higher in spring than in fall, mostly due to an increase in daytime production. The sediment reworking rate of Perinereis was similar in the two seasons in which observations were made and depended on its density and the sediment reworking rate per individual. The overall sediment reworking rate of Perinereis was 31 mm yr^?1 based on its density in the study area.  相似文献   

Erratum to: Velocity attenuation of debris flows and a new momentum-based load model for rigid barriers     

R. C. H. Koo  J. S. H. Kwan  C. W. W. Ng  C. Lam  C. E. Choi  D. Song  W. K. Pun 《Landslides》2017,14(2):631-631

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韩国东海Ulleung盆地天然气水合物沉积层的地震属性分析     

Snons Cheong  Wonsik Kim  Namhyung Koo  孙萍 《海洋地质前沿》2009,25(2):22-23

地震属性可以由多种地震子波的特征来定义。并且根据不同的标准分类。选择叠前地震数据特征可提供丰富的诸如偏移和方向的资料，此次研究中，我们将限制叠后地震数据以提取地震属性，叠后地震数据可以通过子波特征和瞬时特征来分类。  相似文献