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Accelerating the Sweep3D for a Graphic Processor Unit
Gong, Chunye,Liu, Jie,Chen, Haitao,Xie, Jing,Gong, Zhenghu Korea Information Processing Society 2011 Journal of information processing systems Vol.7 No.1
As a powerful and flexible processor, the Graphic Processing Unit (GPU) can offer a great faculty in solving many high-performance computing applications. Sweep3D, which simulates a single group time-independent discrete ordinates (Sn) neutron transport deterministically on 3D Cartesian geometry space, represents the key part of a real ASCI application. The wavefront process for parallel computation in Sweep3D limits the concurrent threads on the GPU. In this paper, we present multi-dimensional optimization methods for Sweep3D, which can be efficiently implemented on the finegrained parallel architecture of the GPU. Our results show that the overall performance of Sweep3D on the CPU-GPU hybrid platform can be improved up to 4.38 times as compared to the CPU-based implementation.
Label-Free Fluorescent Detection of Hg2+ in Aqueous Media Based on N-Doped MoS2 Nanosheets
Jing Liu,Xiao Li,Xin Gong,Taiping Qing,Peng Zhang,Bo Feng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5
The incorporation of dopant atoms alters the structure of MoS2, resulting in unique properties and practical applications. Herein, a facile and low-cost approach for producing N-doped molybdenum disulfide (N-MoS2) was carried out using melamine and MoS2 in a laboratory tube furnace at 400 ℃ for 2h. The N-MoS2 fluorescent probe showed sensitive response to Hg2+ in a wide concentration range of 0.4–10 μM with a low limit of 28 nM. The practical applicability of detecting Hg2+ in lake water samples may open a new way to evaluate Hg2+ in wastewater.
Gong, Xue,Flores-Vergara, Miguel A.,Hong, Jing Han,Chu, Huangwei,Lim, Jun,Franks, Robert G.,Liu, Zhongchi,Xu, Jian American Society of Plant Biologists 2016 Plant Physiology Vol.170 No.3
<P>A decade of studies on middle cortex (MC) formation in the root endodermis of Arabidopsis (Arabidopsis thaliana) have revealed a complex regulatory network that is orchestrated by several GRAS family transcription factors, including SHORT-ROOT (SHR), SCARECROW (SCR), and SCARECROW-LIKE3 (SCL3). However, how their functions are regulated remains obscure. Here we show that mutations in the SEUSS (SEU) gene led to a higher frequency of MC formation. seu mutants had strongly reduced expression of SHR, SCR, and SCL3, suggesting that SEU positively regulates these genes. Our results further indicate that SEU physically associates with upstream regulatory sequences of SHR, SCR, and SCL3; and that SEU has distinct genetic interactions with these genes in the control of MC formation, with SCL3 being epistatic to SEU. Similar to SCL3, SEU was repressed by the phytohormone GA and induced by the GA biosynthesis inhibitor paclobutrazol, suggesting that SEU acts downstream of GA signaling to regulate MC formation. Consistently, we found that SEU mediates the regulation of SCL3 by GA signaling. Together, our study identifies SEU as a new critical player that integrates GA signaling with transcriptional inputs from the SHR-SCR-SCL3 module to regulate MC formation in the Arabidopsis root.</P>
Sliding Mode Control for Servo Motors Based on the Differential Evolution Algorithm
Yin, Zhonggang,Gong, Lei,Du, Chao,Liu, Jing,Zhong, Yanru The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
A sliding mode control (SMC) for servo motors based on the differential evolution (DE) algorithm, called DE-SMC, is proposed in this study. The parameters of SMC should be designed exactly to improve the robustness, realize the precision positioning, and reduce the steady-state speed error of the servo drive. The main parameters of SMC are optimized using the DE algorithm according to the speed feedback information of the servo motor. The most significant influence factor of the DE algorithm is optimization iteration. A suitable iteration can be achieved by the tested optimization process profile of the main parameters of SMC. Once the parameters of SMC are optimized under a convergent iteration, the system realizes the given performance indices within the shortest time. The experiment indicates that the robustness of the system is improved, and the dynamic and steady performance achieves the given performance indices under a convergent iteration when motor parameters mismatch and load disturbance is added. Moreover, the suitable iteration effectively mitigates the low-speed crawling phenomenon in the system. The correctness and effectiveness of DE-SMC are verified through the experiment.
NUMERICAL SIMULATION OF SYNOPTIC CONDITION ON A SEVERE SAND DUST STORM
JIANG, XUE-GONG,SHEN, JIAN-GUO,LIU, JING-TAO,CHUNG, YONG-SEUNG 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8
By using observational data and MM5, an observational analysis and numerical study was conducted on the synoptic condition of a severe dust storm that was caused by a Mongolian cyclone which occurred from 6 to 8 April 2001. Results illustrated that the cyclogenesis was due to the isentropic potential voiticity (IPV) advection in the upper troposphere and the terrain modified baroclinicity in the mid-lower troposphere. The Altai-Sayan complex of mountains blocked the lower level cold air and made the isentropic surface sharply sleep. When the air slid down along the isentropic surface the increasing of baroclinicity and decreasing of stability blew up the vertical voiticity development. The formation of the dust storm was a result of a cyclonic cold front passing across the area. The occurrence of this dust storm was closely related to the strong surface wind, which was accompanied by a cold front passing, rather than the cyclogenesis, itself. Hence, the reason for the pre-front dust stonn formulation was the formation of heating convection. Reasons behind the formation of a black storm (visibility lower than 50 m), which occurred in the mid-north part of Inner Mongolia, lay in several aspects. Firstly, in this area the surface wind was strong, a direct result of the downward transport in mid-lower troposphere. Secondly, the cold front passed over the effected area near sunset so the air obtained much more surface heating to form a deeper mixed layer (ML). Thirdly, cooperation between the lower level wind and the terrain made the atmosphere in this area and acquired the maximum advective contribution necessary to form a deep post-front ML. The sensitivity experiment revealed that surface heal flux was important to the frontal lifting. In addition, the forcing of surface heating was also seen as the primary forcing mechanism of frontogenesis. Meanwhile, removal of the surface heat flux made the atmospheric stratification became stable and the pre-storm ML very shallow, which weakened the strength of the dust storm.
Accelerating the Sweep3D for a Graphic Processor Unit
( Chun Ye Gong ),( Jie Liu ),( Hai Tao Chen ),( Jing Xie ),( Zheng Hu Gong ) 한국정보처리학회 2011 Journal of information processing systems Vol.7 No.1
As a powerful and flexible processor, the Graphic Processing Unit (GPU) can offer a great faculty in solving many high-performance computing applications. Sweep3D, which simulates a single group time-independent discrete ordinates (Sn) neutron transport deterministically on 3D Cartesian geometry space, represents the key part of a real ASCI application. The wavefront process for parallel computation in Sweep3D limits the concurrent threads on the GPU. In this paper, we present multi-dimensional optimization methods for Sweep3D, which can be efficiently implemented on the fine-grained parallel architecture of the GPU. Our results show that the overall performance of Sweep3D on the CPU-GPU hybrid platform can be improved up to 4.38 times as compared to the CPU-based implementation.
Phase lag compensation for improving the stability of LCL‑type converters under weak grid condition
Jianfeng Wang,Guobing Pan,Jing Ouyang,Chengyao Liu,Yinghao Zhou,Gong Fei 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.5
LCL-type converters are widely used in the sustainable energy generation system due to their flexible current control strategies and high efficiency. The LCL filter has a resonance peak, which needs to be handled appropriately; otherwise, it causes system instability. Single-loop feedback control strategy is very popular at present; it does not require additional sensors to measure the state variables for active damping. Under weak grid condition, the resonance peak of LCL filter shifts to the left evidently and greatly reduces the stability margin; thus, maintaining the stability of single-loop control is a challenging task. This paper presents an improved grid current feedback (GCF) single-loop control strategy, which is designed to raise the stability margin of system to adapt weak grid condition. Low pass filter controller is used for phase lag compensation. A phase margin design method is proposed to ensure system stability, and the corresponding discrete method in z-domain has been proposed in detail. Experiments performed on a three-phase converter platform are finally presented to verify the effectiveness of the proposed phase lag compensation for GCF control strategy.
Sliding Mode Control for Servo Motors Based on the Differential Evolution Algorithm
Zhonggang Yin,Lei Gong,Chao Du,Jing Liu,Yanru Zhong 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.1
A sliding mode control (SMC) for servo motors based on the differential evolution (DE) algorithm, called DE-SMC, is proposed in this study. The parameters of SMC should be designed exactly to improve the robustness, realize the precision positioning, and reduce the steady-state speed error of the servo drive. The main parameters of SMC are optimized using the DE algorithm according to the speed feedback information of the servo motor. The most significant influence factor of the DE algorithm is optimization iteration. A suitable iteration can be achieved by the tested optimization process profile of the main parameters of SMC. Once the parameters of SMC are optimized under a convergent iteration, the system realizes the given performance indices within the shortest time. The experiment indicates that the robustness of the system is improved, and the dynamic and steady performance achieves the given performance indices under a convergent iteration when motor parameters mismatch and load disturbance is added. Moreover, the suitable iteration effectively mitigates the low-speed crawling phenomenon in the system. The correctness and effectiveness of DE-SMC are verified through the experiment.