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RISS 인기검색어
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- 저자 : Liding Wang (검색결과 4 건)
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Ocean color products from the Korean Geostationary Ocean Color Imager (GOCI).
Wang, Menghua,Ahn, Jae-Hyun,Jiang, Lide,Shi, Wei,Son, SeungHyun,Park, Young-Je,Ryu, Joo-Hyung Optical Society of America 2013 Optics express Vol.21 No.3
<P>The first geostationary ocean color satellite sensor, Geostationary Ocean Color Imager (GOCI), which is onboard South Korean Communication, Ocean, and Meteorological Satellite (COMS), was successfully launched in June of 2010. GOCI has a local area coverage of the western Pacific region centered at around 36N and 130E and covers ~2500 2500 km(2). GOCI has eight spectral bands from 412 to 865 nm with an hourly measurement during daytime from 9:00 to 16:00 local time, i.e., eight images per day. In a collaboration between NOAA Center for Satellite Applications and Research (STAR) and Korea Institute of Ocean Science and Technology (KIOST), we have been working on deriving and improving GOCI ocean color products, e.g., normalized water-leaving radiance spectra (nLw(λ)), chlorophyll-a concentration, diffuse attenuation coefficient at the wavelength of 490 nm (Kd(490)), etc. The GOCI-covered ocean region includes one of the world's most turbid and optically complex waters. To improve the GOCI-derived nLw(λ) spectra, a new atmospheric correction algorithm was developed and implemented in the GOCI ocean color data processing. The new algorithm was developed specifically for GOCI-like ocean color data processing for this highly turbid western Pacific region. In this paper, we show GOCI ocean color results from our collaboration effort. From in situ validation analyses, ocean color products derived from the new GOCI ocean color data processing have been significantly improved. Generally, the new GOCI ocean color products have a comparable data quality as those from the Moderate Resolution Imaging Spectroradiometer (MODIS) on the satellite Aqua. We show that GOCI-derived ocean color data can provide an effective tool to monitor ocean phenomenon in the region such as tide-induced re-suspension of sediments, diurnal variation of ocean optical and biogeochemical properties, and horizontal advection of river discharge. In particular, we show some examples of ocean diurnal variations in the region, which can be provided effectively from satellite geostationary measurements.</P>
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Junhua Huang,Liding Chen,Xuhuan Xie,Mufeng Wang,Bugong Xu 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.8
This paper investigates the distributed consensus problem for heterogeneous multi-agent systems via event-triggered scheme. To alleviate the communication burden, a distributed event-triggered consensus algorithm using an open-loo estimate and neighboring information is proposed. In the proposed event-triggered scheme, the control input of each agent is dependent on the estimate and information at discrete instants. Firstly, the novel event-triggered consensus algorithm is proposed for fixed topology, which involves the discrete communication between neighboring agents. Then, for the switching topology, the triggering condition is proposed by virtue of a topology-dependent dwell time approach. Further, the corresponding consensus procedures are given. Finally, the effectiveness of the proposed scheme is illustrated by numerical results.
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Protection Relay and Fault Information Analyzing System for Smart Grid
Ge, Liang,Wang, Liding,Yang, Changfu,Zhou, Shuxiong 대한전기학회 2013 The Journal of International Council on Electrical Vol.3 No.2
For smart grid, the fault information from protection relays and fault recorders is useful for dispatchers to identify the grid fault and resume the power supply fleetly when a fault occurs. Traditionally, EMS/SCADA doesn't have the ability to collect the fault information. An application of protection relay and fault information analyzing system is proposed. In order to implement smarter analyzing functions, three approaches are adopted. First, the system unifies IEC61850 and IEC103 for modeling. Second, an analyzing method of relay characteristic is proposed to evaluate the action behavior of protection relays. Finally, the paper presents an approach to replay the actual action sequence with relay's logic diagram. The system has been carried out and the paper concludes that the system is effective and useful for dispatchers and relay operators in smart grid.
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Reliability optimization design of hydraulic system considering oil contamination
Xinda Zhou,Zhaojun Yang,Hailong Tian,Chuanhai Chen,Liding Wang,Yongfu Zhu,Jia Liu 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.12
This paper presents a reliability optimization design method for a hydraulic system that considers oil contamination. The proposed method applies the quantitative relationship between oil contamination and system reliability to the reliability design of a hydraulic system, while considering the performance, layout, and other design factors. A global reliability model of the hydraulic system is constructed based on the oil contamination control model. Further studies aiming at an optimization design model of the hydraulic system is established where the cost is the objective function, reliability index, size and structure range, performance requirements are constraints, structure size and oil change period are design variables. For illustration, a case study on the reliability optimization design of the oil supply point branch of the static pressure bracket of a certain type of heavy CNC horizontal lathe is considered.
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