Compatible taper and stem volume equations for <Emphasis Type="Italic">Larix kaempferi</Emphasis> (Japanese larch) species of South Korea     

Nova D. Doyog  Young Jin Lee  Sun Joo Lee  Jin Taek Kang  Sung Yong Kim 《山地科学学报》2017,14(7):1341-1349

In this study, compatible taper and stem volume equations were developed for Larix kaempferi species of South Korea. The dataset was split into two groups: 80% of the data were used in model fitting and the remaining 20% were used for validation. The compatible MB76 equations were used to predict the diameter outside bark to a specific height, the height to a specific diameter and the stem volume of the species. The result of the stem volume analysis was compared with the existing stem volume model of Larix kaempferi species of South Korea which was developed by the Korea Forest Research Institute and with a simple volume model that was developed with fitting dataset in this study. The compatible model provided accurate prediction of the total stem volume when compared to the existing stem volume model and with a simple volume model. It is concluded that the compatible taper and stem volume equations are more convenient to use and therefore it is recommended to be applied in the Larix kaempferi species of South Korea.  相似文献   

Practical engineering approaches and infrastructure to address the problem of marine debris in Korea     

Rho-Taek Jung Author Vitae  Hong Gun Sung  Sang-In Keel 《Marine pollution bulletin》2010,60(9):1523-1532

As a solution to the problem of persistent solid marine debris, a nationwide project began in Korea in 1999 to develop and popularize fundamental changes to the infrastructure. The ten year project, called “A Practical Integrated System for Marine Debris,” consists of four linked types of technology: prevention, deep-water survey, removal and treatment (recycling). These reflect the characteristics of marine debris, which though widespread, vary by location and time of generation. Each technical component has each representative outcome that has been outreached the local governments and marine debris-related associations. The in situ infrastructures lead to enhance the retrieval of the marine debris and create direct and indirect benefits to industry. Both end-of-pipe technology improvement and the introduction of front-of-pipe technology should be considered as we strive to reduce the generation of marine debris in Korean coastal areas.  相似文献   

A time‐domain seismic SSI analysis method for inelastic bridge structures through the use of a frequency‐dependent lumped parameter model          下载免费PDF全文

Nikolaos Lesgidis  Oh‐Sung Kwon  Anastasios Sextos 《地震工程与结构动力学》2015,44(13):2137-2156

It is highlighted in the past that the soil–structure interaction phenomenon can produce a significant alteration on the response of a bridge structure. A variety of approaches has been developed in the past, which is capable of tackling the soil–structure interaction problem from different perspectives. The popular approach of a discretized truncated finite element model of the soil domain is not always a numerically viable solution, especially for computationally demanding simulations such as the probabilistic fragility analysis of a bridge structure or the real time hybrid simulation. This paper aims to develop a complete modeling procedure that is capable of coping with the soil–structure interaction problem of inelastic bridge structures through the use of a frequency dependent lumped parameter assembly. The proposed procedure encounters accuracy and global stability issues observed on past methods while maintaining the broad applicability of the method by any commercial FEM software. A case study of an overpass bridge structure under earthquake excitations is illustrated in order to verify the proposed method. Copyright © 2015 John Wiley & Sons, Ltd.  相似文献   

Assessment of soil loss in South Korea based on land-cover type     

Chunhwa Jang  Yongchul Shin  Donghyuk Kum  Rogyoung Kim  Jay E. Yang  Sung Chul Kim  Sang Il Hwang  Kyoung Jae Lim  Jeong-Ki Yoon  Youn Shik Park  Younghun Jung 《Stochastic Environmental Research and Risk Assessment (SERRA)》2015,29(8):2127-2141

  相似文献   

Interpretation of coastal wind transfer functions with momentum balances derived from idealized numerical model simulations     

Sung Yong Kim  Ganesh Gopalakrishnan  Aurelien Ponte 《Ocean Dynamics》2015,65(1):115-141

  相似文献   

Storm surge prediction using an artificial neural network model and cluster analysis   总被引：1，自引：1，他引：0  

Sung Hyup You  Jang-Won Seo 《Natural Hazards》2009,51(1):97-114

In this study, an artificial neural network model was developed to predict storm surges in all Korean coastal regions, with a particular focus on regional extension. The cluster neural network model (CL-NN) assessed each cluster using a cluster analysis methodology. Agglomerative clustering was used to determine the optimal clustering of 21 stations, based on a centroid-linkage method of hierarchical clustering. Finally, CL-NN was used to predict storm surges in cluster regions. In order to validate model results, sea levels predicted by the CL-NN model were compared with results using conventional harmonic analysis and the artificial neural network model in each region (NN). The values predicted by the NN and CL-NN models were closer to observed data than values predicted using harmonic analysis. Data such as root mean square error and correlation coefficient varied only slightly between CL-NN and NN model results. These findings demonstrate that cluster analysis and the CL-NN model can be used to predict regional storm surges and may be used to develop a forecast system.  相似文献   

Occurrence of gorgosterol in diatoms of the genus Delphineis     

Sebastiaan W. Rampen  John K. Volkman  Sung Bum Hur  Ben A. Abbas  Stefan Schouten  Ian D. Jameson  Daniel G. Holdsworth  Jean Hee Bae  Jaap S. Sinninghe Damsté 《Organic Geochemistry》2009,40(1):144-147

The presence of the C₃₀ sterol gorgosterol (22,23-methylene-23,24-dimethylcholest-5-en-3ß-ol) and its analogues in some marine and freshwater environments is generally associated with invertebrate animals or dinoflagellates since there have been no reports of them in other microalgal classes. Here we show that two unialgal cultures of different species of the marine diatom Delphineis contain gorgosterol in addition to sterols more commonly found in diatoms. Our findings suggest that some reports of gorgosterol in seawater and marine sediments may well have an origin, at least in part, from diatoms.  相似文献   

Borings in Dinosaur Bone and Bone Chip-filled Burrows in Floodplain Paleosols of the Cretaceous Hasandong Formation, Korea: Occurrence and Paleoenvironmental Implications     

Sung Paik   《Gondwana Research》1999,2(4):601-603

  相似文献   

地壳岩石的失水熔融实验     

林强  葛文春  马瑞  孙德有  吴福元  尹成孝 《吉林大学学报(地球科学版)》1999,29(3)

以岩石粉末试样的熔融实验为基础的 Ｑ Ａｂ Ｏｒ Ａｎ Ｈ２ Ｏ 体系的相关系表明,地壳岩石的熔融作用遵循矿物相消失所制约的固 液相平衡规律。然而,地壳岩石块状样品开放体系的熔融作用,其熔融机制、矿物相转变、初熔液相成分、残余固相等方面,均与地壳岩石封闭体系的熔融作用有很大差别。石英闪长岩开放体系的熔融实验表明,岩石的熔融首先从含水矿物的脱水熔融开始,从而熔体成分由基性逐渐转变为中酸性,残余固相趋于超酸性。这一实验结果对大陆地区岩浆起源和深部地壳物质组成的研究可能有新的启示。  相似文献   

Delayed responses of the oceanic Beaufort Gyre to winds and sea ice motions: influences on variations of sea ice cover in the Pacific sector of the Arctic Ocean     

Eri Yoshizawa  Koji Shimada  Ho Kyung Ha  Tae Wan Kim  Sung Ho Kang  Kyung Ho Chung 《Journal of Oceanography》2015,71(2):187-197

  相似文献