Ternary forecast of heavy snowfall in the Honam area,Korea     

Keon Tae SOHN  Jeong Hyeong LEE  Young Seuk CHO 《大气科学进展》2009,26(2):327-332

The objective of this study is to improve the statistical modeling for the ternary forecast of heavy snowfall in the Honam area in Korea. The ternary forecast of heavy snowfall consists of one of three values, 0 for less than 50 mm, 1 for an advisory (50–150 mm), and 2 for a warning (more than 150 mm). For our study, the observed daily snow amounts and the numerical model outputs for 45 synoptic factors at 17 stations in the Honam area during 5 years (2001 to 2005) are used as observations and potential pre...  相似文献   

Super earth explorer: a coronagraphic off-axis space telescope     

J. Schneider  A. Boccaletti  D. Mawet  P. Baudoz  J.-L. Beuzit  R. Doyon  M. Marley  D. Stam  G. Tinetti  W. Traub  J. Trauger  A. Aylward  J. Y-K. Cho  C.-U. Keller  S. Udry 《Experimental Astronomy》2009,23(1):357-377

The Super-Earth Explorer is an Off-Axis Space Telescope (SEE-COAST) designed for high contrast imaging. Its scientific objective is to make the physico-chemical characterization of exoplanets possibly down to 2 Earth radii. For that purpose it will analyze the spectral and polarimetric properties of the parent starlight reflected by the planets, in the wavelength range 400–1,250 nm.  相似文献   

The thermal conductivity for granite with various water contents     

W.J. Cho  S. Kwon  J.W. Choi 《Engineering Geology》2009,107(3-4):167-171

The thermal conductivities of granite were measured under different conditions of porosity and water content to investigate the effects of the porosity and water content on the thermal conductivity. For the dry samples, the thermal conductivities range from 2.12 W/mK for the rocks with a high porosity to 3.12 W/mK for the ones with a low porosity. Water-sorbed samples have greater thermal conductivities than dry samples of the same granite. The thermal conductivities range from 2.99 W/mK for granites with a high porosity to 3.62 W/mK for ones with a low porosity under saturated condition.  相似文献   

Fine-scale Microbial Communities Associated with Manganese Nodules in Deep-sea Sediment of the Korea Deep Ocean Study Area in the Northeast Equatorial Pacific     

Hyeyoun Cho  Kyeong-Hong Kim  Seung Kyu Son  Jung-Ho Hyun 《Ocean Science Journal》2018,53(2):337-353

Despite its potential significance for industrial utilization, any activities associated with the mining of manganese (Mn) nodules might have substantial impacts on benthic ecosystems. Because microorganisms respond quickly to changing environmental conditions, a study of microbial communities provides a relevant proxy to assess possible changes in benthic ecosystems associated with mining activities. We investigated fine-scale microbial community composition and diversity inside and on the surface of Mn nodules and in nearby deep-sea sediments in the Korea Deep Ocean Study (KODOS) area located in the Clarion-Clipperton Fracture Zone (CCFZ) of the northeast equatorial Pacific. Although microbial cell density was lower within nodules (3.21 × 10⁶ cells g^-1) than in sediment (2.14 × 10⁸ cells g^-1), nodules provided a unique habitat for microorganisms. Manganese-oxidizing bacteria including Hyphomicrobium and Aurantimonas in Alphaproteobacteria and Marinobacter in Gammaproteobacteria were abundant in nodules, which implied that these bacteria play a significant role in nodule formation. In contrast, Idiomarina in Gammaproteobacteria and Erythrobacter and Sulfitobacter in Alphaproteobacteria were abundant in sediments. Meanwhile, Thaumarchaeota, a phylum that consists of ammonia-oxidizing chemolithoautotrophs, were the predominant archaeal group both in nodules and sediment. Overall, microbial communities in Mn nodules were unique compared to those observed in sediments. Furthermore, the phylogenetic composition of microorganisms in the KODOS area was distinguishable from that in the nodule provinces claimed by China and Germany in the CCFZ and nodule fields in the central South Pacific Gyre, respectively.  相似文献   

A Comparative Evaluation of Stress–Strain and Acoustic Emission Methods for Quantitative Damage Assessments of Brittle Rock     

Jin-Seop Kim  Kyung-Soo Lee  Won-Jin Cho  Heui-Joo Choi  Gye-Chun Cho 《Rock Mechanics and Rock Engineering》2015,48(2):495-508

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Real Data Assimilation Using the Local Ensemble Transform Kalman Filter (LETKF) System for a Global Non-hydrostatic NWP model on the Cubed-sphere     

Seoleun Shin  Jeon-Ho Kang  Hyoung-Wook Chun  Sihye Lee  Kwangjae Sung  Kyoungmi Cho  Youngsoon Jo  Jung-Eun Kim  In-Hyuk Kwon  Sujeong Lim  Ji-Sun Kang 《Asia-Pacific Journal of Atmospheric Sciences》2018,54(1):351-360

An ensemble data assimilation system using the 4-dimensional Local Ensemble Transform Kalman Filter is implemented to a global non-hydrostatic Numerical Weather Prediction model on the cubed-sphere. The ensemble data assimilation system is coupled to the Korea Institute of Atmospheric Prediction Systems Package for Observation Processing, for real observation data from diverse resources, including satellites. For computational efficiency in a parallel computing environment, we employ some advanced software engineering techniques in the handling of a large number of files. The ensemble data assimilation system is tested in a semi-operational mode, and its performance is verified using the Integrated Forecast System analysis from the European Centre for Medium-Range Weather Forecasts. It is found that the system can be stabilized effectively by additive inflation to account for sampling errors, especially when radiance satellite data are additionally used.  相似文献   

Large temporal changes in contributions of groundwater-borne nutrients to coastal waters off a volcanic island     

Hyung-Mi Cho  Guebuem Kim 《Ocean Science Journal》2017,52(3):337-344

We examined the contribution of submarine groundwater discharge (SGD) to nutrient budgets in Hwasun Bay, Jeju Island, Korea in August 2009, October 2014, and May 2015. The concentrations of dissolved inorganic nitrogen (DIN) and dissolved inorganic phosphorus (DIP) in fresh groundwater were in the range of 285?716 μM and 2.3?3.2 μM, respectively, which were each 1?2 orders of magnitude higher than those in the bay seawater. The outer-bay seawater flowing into the bay was oligotrophic (2.9 ± 1.9 μM for DIN and 0.2 ± 0.3 μM for DIP). Nutrient budget calculations were performed for each season by accounting for submarine fresh groundwater discharge (SFGD) and water residence times. In August 2009 (DIN = 1.8 μM and DIN:DIP ratio = 4.6 for the outerbay water), DIN inputs from SFGD accounted for approximately 40% of the DIN inventory in the bay seawater. In October 2014 (DIN = 1.1 μM and DIP < 0.05 μM for the outer-bay water), DIP from SFGD accounted for approximately 100% of the DIP inventory in the bay seawater. In May 2015, mean concentrations of DIN and DIP in the bay seawater were 8.6 ± 12 μM and 0.11 ± 0.04 μM, respectively, with conservative behaviors in the bay seawater in association with excessive groundwater inputs. These results imply that SGD plays a critical but different role in nutrient budgets and stoichiometry in coastal waters off a volcanic island depending on open-ocean nutrient conditions.  相似文献   

A successful transformation of conventional SBR to MBR at Indian casino and facility: a case study of Chumash Casino and Resort Water Reclamation Facility (WRF), water reuse perspectives     

Daeik Kim  Yoonho Cho  Kevin McKennon  Greg Lowe  Sungjin Jung  Jinho Kim 《Environmental Earth Sciences》2017,76(16):578

A conventional sequencing batch reactor (SBR) was successfully transformed to a membrane bioreactor (MBR) at an Indian casino resort and hotel, Santa Ynez, California. The technical difficulties from the existing process at the site including a 3-mm screening unit, SBR biological tanks, and sand filtration were relieved of by new biological membrane technology. As the hotel and its vicinity expanded, the existing SBR was not able to treat an increased flow, which was major driving force for such membrane-upgraded project. In addition, as the area was in a high drought zone, without meeting the purpose of water reuse, new hotel expansion was not permitted. New membrane process was designed and built with new 2-mm screening unit, pre-anoxic, oxic (or aerobic), post-anoxic, and MBR tanks along with UV disinfection. The retrofitting work was conducted, minimizing a major revision on the existing SBR structure and its civil work. Therefore, the new packaged system has brought a number of benefits to the customer, thereby utilizing reclaimed water highly meeting the California Code of Regulations (CCR) Title 22 requirements. The reclaimed water goes to toilet water, cooling tower, and irrigation. This study details how such process transformation was technically finished and would help other similar cases in terms of retrofitting exiting biological process to a membrane application without a major civil construction. The cost analysis including capital, operation and maintenance (O&M) costs was included so that it will be practical to ones who will conduct future similar projects.  相似文献   

Laplace–Fourier-Domain Full Waveform Inversion of Deep-Sea Seismic Data Acquired with Limited Offsets     

Yongchae Cho  Wansoo Ha  Youngseo Kim  Changsoo Shin  Satish Singh  Eunjin Park 《Pure and Applied Geophysics》2016,173(3):749-773

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爆炸、核试验与天然地震的区别（英文）     

Cho  Kwang-Hyun 《应用地球物理》2014,(4):429-436

本文通过地震正演模型和面波振幅数据对比分析了天然地震、爆炸,与核试验数据,以探索改进辨别天然地震与爆炸的方法。所提方法是基于波数域和频率域的双积分变换解。用于研究的地震事件都发生在北朝鲜,其中包括2001年6月26日（39.212°N,125.383°E）和2001年10月30日（38.748°N,125.267°E）所记录的爆炸数据,2006年10月9日（41.275°N,129.095°E）所记录的一次核试验数据、以及2002年4月14日（39.207°N,125.686°E）和2002年6月7日（38.703°N,125.638°E）所记录的两次天然地震。基于这些数据通过地震波分析与理论模拟表明爆炸引起的地震与天然地震有着不同的波型特征。爆炸引起的信号特征是P波的能量较S波强,在爆炸记录上0.05-0.5Hz频率之间Rg波清晰呈现,而在然地震记录上没有。这是由于爆炸地震记录上P波是优势波,与SH成分发生了耦合。  相似文献