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COMPARISON OF THE HYDRO-CLIMATOLOGICAL CHARACTERISTICS FOR THE EXTRA-ORDINARY FLOOD INDUCED BY TROPICAL CYCLONE IN THE SELECTED RIVER BASINS

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Tropical Cyclone Research and Review 2013年第1期2卷 45-54页

作者： DONGRYUL lee BYUNGHWA OH HWIRIN KIM sangheon lee GUNHUI CHUNG Water Resources Research Division Korea Institute of Construction TechnologyRepublic of Korea Water Resources Division Korea Institute of Construction TechnologyRepublic of Korea River Information Center Han River Flood Control OfficeMOLITRepublic of Korea River Information Center Han River Flood Control OfficeMOLITRepublic of Korea Department of Civil Engineering Hoseo UniversityCheongchungnam-DoRepublic of Korea

As the increased interesting on global warming and extreme water-related disasters, there are many countries which have been suffering from the extreme floods induced by tropical cyclones in East Asia. Therefore, in this study, the geographical and hydrometeolorogical characteristics and flood forecasting and warning systems in the selected basins from Thailand, Philippines, and South Korea are compared. Chao Phraya river basin, Pampanga river basin and Nakdong river basin are selected from Thailand, Philippines, and South Korea, respectively. As the results from the comparison, it was discovered that the different geographical and hydrometeolorogical characteristics delivers the different types of flood forecasting and warning systems in each basin. Due to the different geographical characteristics, the damage caused by the similar amount of monthly rainfall is different according to the historical records. This difference is expected to be caused by the different river regime coefficient and soil structures. The flood forecasting and warning systems in three basins are also different. South Korea has the centralized control system for the flood forecasting and warning, while the other basins have the more localized monitoring, forecasting, and warning procedures. In addition to the flood forecasting and warning system, according to the geographical characteristics, the density of the gauging stations is also different. The analyzed results might help the policy makers in the basins develop the adaptive flood forecasting and warning system considering the basin characteristics. In the further study, more investigation has to be done for the quantified results from the three basins.

关键词： global warming extreme water-related disasters countries

Strategy for Creating AR Applications in Static and Dynamic Environments Using SLAM-and Marker Detector-Based Tracking

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Computer Modeling in Engineering & Sciences 2022年第4期131卷 529-549页

作者： Chanho Park Hyunwoo Cho sangheon Park Sung-Uk Jung Suwon lee Electronics and Telecommunications Research Institute Daejeon34129Korea Graduate School of Engineering The University of TokyoTokyo113-0033Japan School of Computer Science and The Research Institute of Natural Science Gyeongsang National UniversityJinju-si52828Korea

Recently,simultaneous localization and mapping(SLAM)has received considerable attention in augmented reality(AR)libraries and *** the assumption of scene rigidity is common in most visual SLAMs,this assumption limits the possibilities of AR applications in various real-world *** this paper,we propose a new tracking system that integrates SLAMwith amarker detection module for real-time AR applications in static and dynamic *** the proposed system assumes that the marker is movable,SLAM performs tracking andmappingof the static scene except for themarker,andthemarker detector estimates the 3-dimensional pose of the marker attached to the dynamic *** can place SLAM maps,cameras,and dynamic objects(markers)on the same coordinate system,and we can also accurately augment AR resources in real-time on both the static scene and dynamic objects ***,having a static map of the scene in advance has the advantage of being able to performtracking of static and dynamic environments with mapping *** this paper,we evaluate whether the proposed tracking systemis suitable for AR applications and describe a strategy for creating AR applications in static and dynamic environments with a demonstration.

关键词： Augmented reality SLAM marker tracking coordinate system

Estimating Fuel-Efficient Air Plane Trajectories Using Machine Lear

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Computers, Materials & Continua 2022年第3期70卷 6189-6204页

作者： Jaiteg Singh Gaurav Goyal Farman Ali Babar Shah sangheon Pack Chitkara University Institute of Engineering&Technology Chitkara UniversityPunjab140401India Department of Software Sejong UniversitySeoul05006Korea College of Technological Innovation Zayed UniversityUAE School of Electrical Engineering Korea UniversitySeoulKorea

Airline industry has witnessed a tremendous growth in the recent *** of people choosing air travel as first choice to commute is continuously *** demanding and congested air routes are resulting in inadvertent delays,additional fuel consumption and high emission of greenhouse *** planning involves creation identification of cost-effective flight plans for optimal utilizationof fuel and *** situation warrants the need of an intelligent system for dynamic planning of optimized flight trajectories with least human intervention *** this paper,an algorithm for dynamic planning of optimized flight trajectories has been *** proposed algorithm divides the airspace into four dimensional cubes and calculate a dynamic score for each cube to cumulatively represent estimated weather,aerodynamic drag and air traffic within that virtual *** are several constraints like simultaneous flight separation rules,weather conditions like air temperature,pressure,humidity,wind speed and direction that pose a real challenge for calculating optimal flight *** validate the proposed methodology,a case analysis was undertaken within Indian *** flight routes were simulated for four different air routes within Indian *** experiment results observed a seven percent reduction in drag values on the predicted path,hence indicates reduction in carbon footprint and better fuel economy.

关键词： Airplane trajectory coefficient of drag four-dimensional trajectory prediction machine learning route planning stochastic processes

Strain-tunable optical microlens arrays with deformable wrinkles for spatially coordinated image projection on a security substrate

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Microsystems & Nanoengineering 2022年第5期8卷 225-237页

作者： In Sik Choi Seongho Park sangheon Jeon Young Woo Kwon Rowoon Park Robert A.Taylor Kwangseuk Kyhm Suck Won Hong Department of Cogno-Mechatronics Engineering Department of Optics and Mechatronics EngineeringPusan National UniversityBusan 46241Republic of Korea Research Center for Dielectric and Advanced Matter Physics Pusan National UniversityBusan 46241Republic of Korea Department of Physics University of OxfordOxford OX13PUUK Department of Nano-Fusion Technology Pusan National UniversityBusan 46241Republic of Korea

As a new concept in materials design,a variety of strategies have been developed to fabricate optical microlens arrays(MLAs)that enable the miniaturization of optical systems on the micro/nanoscale to improve their characteristic performance with unique optical *** this paper,we introduce a cost-effective and facile fabrication process on a large scale up to~15 inches via sequential lithographic methods to produce thin and deformable hexagonally arranged MLAs consisting of polydimethylsiloxane(PDMS).Simple employment of oxygen plasma treatment on the prestrained MLAs effectively harnessed the spontaneous formation of highly uniform nanowrinkled structures all over the surface of the elastomeric *** strain-controlled tunability,unexpected optical diffraction patterns were characterized by the interference combination effect of the microlens and deformable ***,the hierarchically structured MLAs presented here have the potential to produce desirable spatial arrangements,which may provide easily accessible opportunities to realize microlens-based technology by tunable focal lengths for more advanced micro-optical devices and imaging projection elements on unconventional security substrates.

关键词： projection arrays spatially

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灵山河流域孢粉记录的早中全新世环境变迁

灵山河流域孢粉记录的早中全新世环境变迁

土地利用变化对陆地生态系统碳储量的影响--以太湖流域和呼伦湖流域为例

中国古生物学会孢粉学分会第九届一次学术年会

作者：贾红娟 sangheon Yi 董源陈海骄石家庄经济学院研实验实践教学中心 Geologic Environment Division Korea Institute of Geoscience and Mineral Resources 石家庄经济学院研究生学院

韩国灵山河中游钻孔以10cm间距采样进行孢粉分析,根据AMS 14C年龄结果显示剖面时间跨度为早中全新世,孢粉记录显示该区植被和气候变化可划分为3个阶段:8500cal B.P.之前孢粉浓度和AP/NAP值低,反应气候相对冷干。8500-6300 ka cal B.P.... 详细信息

韩国灵山河中游钻孔以10cm间距采样进行孢粉分析,根据AMS 14C年龄结果显示剖面时间跨度为早中全新世,孢粉记录显示该区植被和气候变化可划分为3个阶段:8500cal B.P.之前孢粉浓度和AP/NAP值低,反应气候相对冷干。8500-6300 ka cal B.P.之间发育以栎为主的温带落叶阔叶林,反应气候相对暖湿,这一阶段又可划分为两个亚带,早期以栎、莎草和香蒲为主,晚期以栎和松为主。6300cal B.P.之后以松和禾本科为主,气候相对晾干。

关键词：孢粉全新世灵山河韩国

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第四纪研究 2012年第2期32卷 327-336页

作者：魏文佳桂智凡薛滨段洪涛姚书春李相憲中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室南京210008 福建省土地开发整理中心福州350001 中国科学院研究生院北京100049 韩国地质矿产研究院韩国大田305350

土地利用和覆被变化对陆地生态系统碳循环有着显著的影响,研究土地利用变化对陆地生态系统碳储量的影响,有利于揭示人类活动和气候变化对陆地生态系统碳循环的驱动机制,同时为制定合理的区域碳排放政策提供参考。本研究采用1980年、199... 详细信息

土地利用和覆被变化对陆地生态系统碳循环有着显著的影响,研究土地利用变化对陆地生态系统碳储量的影响,有利于揭示人类活动和气候变化对陆地生态系统碳循环的驱动机制,同时为制定合理的区域碳排放政策提供参考。本研究采用1980年、1995年、2000年和2005年4期遥感影像解译的土地利用数据,借助IPCC第四次报告推荐的计算方法和对应参数,选择我国东部亚热带和温带的两个典型大湖——太湖流域和呼伦湖流域1980～2005年碳收支情况进行估算,结果表明:1)1980～2005年太湖流域的土地利用结构变化主要表现为农田的逐年减少和聚居地的持续增长,而呼伦湖流域则主要表现为由于林地向草地的转化和草地向其他土地的转化所导致的林地面积的减少和其他土地面积的增加。2)在碳源/汇方面,太湖流域和呼伦湖流域均表现为碳汇,对于太湖流域来说,林地和农田是主要的碳汇,聚居地是碳支出的主要贡献者,2000年以来呼伦湖流域固碳能力出现比较明显的下降,林地和草地的变化是导致碳储量变化的主导因素。3)通过两个流域碳储量变化情况的比较,发现人类活动对陆地生态系统碳储量的影响较为显著;此外,植被类型差异以及成林时间也是影响固碳能力的主要原因。

关键词：土地利用变化碳库变化碳储量太湖流域呼伦湖流域