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Jinha Jung,Bryan C. Pijanowski 한국지질과학협의회 2015 Geosciences Journal Vol.19 No.4
LiDAR is an active remote sensing technique with a unique capability to capture three-dimensional information of the earth’s surface even in heavily vegetated areas, and it is proven to be useful in many research applications. Although it is becoming the remote sensing platform of choice for planning and natural resource agencies that require three-dimensional information, the enormous data that are generated and the lack of available software analysis packages make LiDAR still unavailable to a typical user of spatial data. LiDARHub is a free and open source platform for web-based management, visualization and analysis of LiDAR data that enables development of online tools for LiDAR data processing in a web browser. The framework provides a foundation to develop online tools for LiDAR data processing and tools can be shared. The framework is also flexible so that the developed tools can be easily ported to High Performance Computing (HPC) environments that speed up the computationally extensive LiDAR data processing. Two example LiDARHub tools are presented as case studies to demonstrate potential software development scenarios. The developed tools provide easy to use user interface and hide complex computation so that users can take advantage of the LiDAR technology with only a web browser. The LiDARHub allows not only the sharing of large volume of LiDAR data but also developing online LiDAR processing platform for a large audience.
Mapping Vegetation Volume in Urban Environments by Fusing LiDAR and Multispectral Data
Jung, Jinha,Pijanowski, Bryan The Korean Society of Remote Sensing 2012 大韓遠隔探査學會誌 Vol.28 No.6
Urban forests provide great ecosystem services to population in metropolitan areas even though they occupy little green space in a huge gray landscape. Unfortunately, urbanization inherently results in threatening the green infrastructure, and the recent urbanization trends drew great attention of scientists and policy makers on how to preserve or restore green infrastructure in metropolitan area. For this reason, mapping the spatial distribution of the green infrastructure is important in urban environments since the resulting map helps us identify hot green spots and set up long term plan on how to preserve or restore green infrastructure in urban environments. As a preliminary step for mapping green infrastructure utilizing multi-source remote sensing data in urban environments, the objective of this study is to map vegetation volume by fusing LiDAR and multispectral data in urban environments. Multispectral imageries are used to identify the two dimensional distribution of green infrastructure, while LiDAR data are utilized to characterize the vertical structure of the identified green structure. Vegetation volume was calculated over the metropolitan Chicago city area, and the vegetation volume was summarized over 16 NLCD classes. The experimental results indicated that vegetation volume varies greatly even in the same land cover class, and traditional land cover map based above ground biomass estimation approach may introduce bias in the estimation results.
New Motion Vector Prediction for Pipelined Motion Estimation in H.264/AVC
Jinha Choi,Yunho Jung,Yunsik Lee,Jaeseok Kim 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
This paper proposes a new motion vector prediction (MVP) scheme for high speed motion estimation (ME) in H.264/AVC. Though MVP is essential for high coding efficiency, ME with MVP cannot be processed in parallel for high speed implementation due to the data dependency of MVP. To eliminate this data dependency, MVP schemes are proposed. However these MVPs degrade coding quality for high speed processing. The proposed MVP uses the motion vectors in the neighboring macro blocks instead of those in the near sub-macro blocks which are used in the standard. Consequently, high speed ME is possible by using the proposed MVP and the processing time is reduced by up to 88% with insignificant coding quality degradation. The proposed MVP decrease 0.01 ㏈ Bjontegaard difference PSNR (BDPSNR) and increase 1.08% BD bit rate. The proposed MVP is verified with ME architecture which can encode SD (720×576) resolution video sequence in real-time at 54MHz operation clock with 284K logic gates.
A Study on the Application of Safeguards to Small Modular Reactor
Jinha Choi,Hyun-Jo Kim,Byung-Doo Lee,Sung-Ho Lee,Juang Jung 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
In addition to Korea, various countries such as the United States, the United Kingdom, France, and China are designing small module-type reactors. In particular, a small modular reactor is the power of 300 MWe or less, in which the main equipment constituting the nuclear reactor is integrated into a single container. Depending on the purpose, small modular reactors are being developed to help daily life such as power, heating supply, and seawater desalination, or for power supply such as icebreakers, nuclear submarines, and spacecraft propellants. Small modular reactors are classified according to form. It can be classified into light-water reactors/ pressurized light-water reactors based on technology proven in commercial reactors, and non-lightwater reactors based on fuel and coolant type such as Sodium-cooled Fast Reactor, High temperature gas-cooled reactor, Very high temperature reactor and Moltenn salt reactor. SMRs, which are designed for various purposes, have the biggest difference from commercial nuclear reactors. The size of SMRs is as small as 1/5 of that of the commercial reactors. Several modules may be installed to generate the same power as commercial reactors. Because of the individually operation for each module, load follow is possible. Also, The reactor can be cooled by natural convection because the size is small enough. It is manufactured as a module, the construction period can be reduced. Depending on the characteristics of these SMRs, application for safeguards is considered. There are many things to consider in terms of safeguards. Therefore, it is IAEA inspection or other approaches for SMRs installed and remotely operated in isolated areas, data integrity for remote monitoring equipment to prevent the diversion of nuclear materials, verification method and material accountancy and control for new fuel types and reactors. Since SMR is more compact and technical intensive, safeguards should be considered at the design stage so that safeguards can be efficiently and effectively implemented, which is called the Safeguards by design (SBD) in the IAEA. In this paper, according to the characteristics of SMR, we will analyze the advantages/disadvantages from the point of view of safeguards and explain what should be considered.
초음파 테이블을 이용한 단결정 사파이어 웨이퍼의 ELID 연삭가공 특성 연구
황진하(JinHa Hwang),곽태수(Tae-Soo Kwak),이득우(Deug-Woo Lee),정명원(Myung-Won Jung),이상민(Sang-Min Lee) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.4
Single crystal sapphire being used in high technology industry is a brittle material with a high hardness and excellent physical properties. ELID(Electrolytic In-Process Dressing) grinding technology was applied to material removal machining process of single crystal sapphire wafer. Ultrasonic vibration which added to material using ultrasonic table was adopted to efficient ELID grinding of sapphire materials. The evaluation of the ground surface of single crystal sapphire wafer was carried out by means of surface measuring by using AFM(Atomic Force Microscope), surface roughness tester and optical microscope device. As the results of experiment, it was shown that more efficient grinding was conducted when using ultrasonic table. In case of using #170 grinding wheel, surface roughness of ELID ground specimen in using ultrasonic table was superior to ELID ground specimen without ultrasonic table. However, In case of using #2000 grinding wheel, surface roughness of ELID ground specimen in using ultrasonic table was inferior to ELID ground specimen without ultrasonic table.