oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 161 )

2018 ( 1208 )

2017 ( 1072 )

2016 ( 1095 )

Custom range...

Search Results: 1 - 10 of 78214 matches for " Dongju Chen "
All listed articles are free for downloading (OA Articles)
Page 1 /78214
Display every page Item
Carriage Error Identification Based on Cross-Correlation Analysis and Wavelet Transformation
Donghui Mu,Dongju Chen,Jinwei Fan,Xiaofeng Wang,Feihu Zhang
Sensors , 2012, DOI: 10.3390/s120709551
Abstract: This paper proposes a novel method for identifying carriage errors. A general mathematical model of a guideway system is developed, based on the multi-body system method. Based on the proposed model, most error sources in the guideway system can be measured. The flatness of a workpiece measured by the PGI1240 profilometer is represented by a wavelet. Cross-correlation analysis performed to identify the error source of the carriage. The error model is developed based on experimental results on the low frequency components of the signals. With the use of wavelets, the identification precision of test signals is very high.
Precise orbit determination for Jason-1 satellite using on-board GPS data with cm-level accuracy
DongJu Peng,Bin Wu
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-008-0513-0
Abstract: The joint US/French Jason-1 satellite altimeter mission, launched from the Vandenberg Air Force Base on December 7, 2001, continues the time series of centimeter-level ocean topography observations as the follow-on to the highly successful T/P radar altimeter satellite. Orbit error especially the radial orbit error is a major component in the overall budget of all altimeter satellite missions, in order to continue the T/P standard of observations. Jason-1 has a radial orbit error budget requirement of 2.5 cm. In this work, two cycles (December 19, 2002 to January 7, 2003) of the Jason-1 on-board GPS data were processed using the zero-difference (ZD) dynamic precise orbit determination (POD) technique. The resulting Jason-1 orbit accuracy was assessed by comparison with the precise orbit ephemeris (POE) produced by JPL, orbit overlaps and SLR residuals. These evaluations indicate that the RMS radial accuracy is in the range of 1–2 cm.
Zero-difference and single-difference precise orbit determination for LEO using GPS
DongJu Peng,Bin Wu
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0264-3
Abstract: Various methods for precise orbit determination (POD) of low earth orbiters (LEO) are briefly introduced in this paper. Based on the software named SHORD-III developed by our institute, single-difference (SD) and zero-difference (ZD) dynamic POD based on LEO carrying an on-board GPS receiver is mainly discussed. The approaches are tested using real GRACE data (November 5–25, 2002) and independently validated with Satellite Laser Ranging (SLR) measurements over the same 21 days. Comparisons with the scientific orbits provided by GFZ indicate that the SD POD RMS accuracy can achieve 5, 10 and 6 cm in radial, along and cross the track, and the ZD POD RMS accuracy can achieve 4, 8 and 4 cm in radial, along and cross the track. SLR validation shows that SD POD accuracy is better than 8 cm in distance, and ZD POD accuracy is better than 6 cm.
Precise orbit determination for Jason-1 satellite using on-board GPS data with cm-level accuracy

PENG DongJu &,WU Bin,

科学通报(英文版) , 2009,
Abstract: The joint US/French Jason-1 satellite altimeter mission, launched from the Vandenberg Air Force Base on December 7, 2001, continues the time series of centimeter-level ocean topography observations as the follow-on to the highly successful T/P radar altimeter satellite. Orbit error especially the radial orbit error is a major component in the overall budget of all altimeter satellite missions, in order to continue the T/P standard of observations. Jason-1 has a radial orbit error budget requirement of 2.5 cm. In this work, two cycles (December 19, 2002 to January 7, 2003) of the Jason-1 on-board GPS data were processed using the zero-difference (ZD) dynamic precise orbit determination (POD) technique. The resulting Jason-1 orbit accuracy was assessed by comparison with the precise orbit ephemeris (POE) produced by JPL, orbit overlaps and SLR residuals. These evaluations indicate that the RMS radial accuracy is in the range of 1–2 cm. Supported by the National Natural Science Foundation of China (Grant No. 40274006), High-tech Research and Development Program of China (Grant No. 2006AA12A107) and Science & Technology Commission of Shanghai Municipality (Grant No. 06DZ22101)
Incorporation of functionalized gold nanoparticles into nanofibers for enhanced attachment and differentiation of mammalian cells
Dongju Jung, Itsunari Minami, Patel Sahishnu, Jonghwan Lee, Bin Jiang, Qinghua Yuan, Liu Li, Sachiko Kobayashi, Yong Chen, KiBum Lee, Norio Nakatsuji
Journal of Nanobiotechnology , 2012, DOI: 10.1186/1477-3155-10-23
Abstract: Small molecules, peptides, and functionalized gold nanoparticles were successfully incorporated with polymethylglutarimide (PMGI) nanofibers through electrospinning. The PMGI nanofibers functionalized by the grafted AuNPs, which were labeled with cell-adhesive peptides, enhanced HeLa cell attachment and potentiated cardiomyocyte differentiation of human pluripotent stem cells.PMGI nanofibers can be functionalized simply by co-electrospinning with the grafting materials. In addition, grafting functionalized AuNPs enable high-density localization of the cell-adhesive peptides on the nanofiber. The results of the present study suggest that more cell type-specific synthetic substrata can be fabricated with molecule-doped nanofibers, in which diverse functional molecules are grafted alone or in combination with other molecules at different concentrations.
Archaeological records of Dadiwan in the past 60 ka and the origin of millet agriculture
DongJu Zhang,FaHu Chen,R. L. Bettinger,L. Barton,DuXue Ji,C. Morgan,Hui Wang,XiaoZhong Cheng,GuangHui Dong,T. P. Guilderson,Hui Zhao
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3097-4
Abstract: This paper reports the recent excavation of Unit Dadiwan06 at the Dadiwan site in Qin’an County, Gansu. A 65 ka chronological framework is established for Dadiwan06 on the basis of absolute dating (AMS 14C and OSL), stratigraphy, climate change events and archaeology. Artifact distributions reveal patterns of human behavioral variation and adaptation over the past 60 ka, from primitive hunting and gathering to advanced hunting and gathering, to primitive Neolithic agriculture, and finally to advanced Neolithic agriculture.
An efficient method for solving a correlated multi-item inventory system
Chang-Yong Lee,Dongju Lee
Physics , 2014,
Abstract: We propose an efficient method of finding an optimal solution for a multi-item continuous review inventory model in which a bivariate Gaussian probability distribution represents a correlation between the demands of different items. By utilizing appropriate normalizations of the demands, we show that the normalized demands are uncorrelated. Furthermore, the set of equations coupled with different items can be decoupled in such a way that the order quantity and reorder point for each item can be evaluated independently from those of the other. As a result, in contrast to conventional methods, the solution procedure for the proposed method can be much simpler and more accurate without any approximation. To demonstrate the advantage of the proposed method, we present a solution scheme for a multi-item continuous review inventory model in which the demand of optional components depend on that of a "vanilla box", representing the customer's stochastic demand, under stochastic payment and budget constraints. We also perform a sensitivity analysis to investigate the dependence of order quantities and reorder points on the correlation coefficient.
Involvement of TIP60 acetyltransferase in intracellular Salmonella replication
Xueqin Wang, Dongju Li, Di Qu, Daoguo Zhou
BMC Microbiology , 2010, DOI: 10.1186/1471-2180-10-228
Abstract: In an attempt to identify host proteins that interact with SseF, we conduct a yeast two-hybrid screening of human cell cDNA library using SseF as the bait. We identified that TIP60, an acetyltransferase, interacts with SseF. We showed that the TIP60 acetylation activity was increased in the presence of SseF, and TIP60 was upregulated upon Salmonella infection. In addition, TIP60 is required for efficient intracellular Salmonella replication in macrophages.Taken together, our data suggest that Salmonella may use SseF to exploit the host TIP60 acetyltransferase activity to promote efficient Salmonella replication inside host cells.Protein acetylation adds the acetyl group on either the amino-terminal residues or on the epsilon-amino group of lysine residues. Lysine acetylation affects many protein functions, including DNA binding, protein-protein interactions, and protein stability. TIP60 catalyzes histone acetylation [1,2]. It was originally identified as a cellular acetyltransferase protein that interacts with HIV-1 Tat [3]. Over-expression of TIP60 increased Tat transactivation of the HIV-1 promoter [3]. Recent studies found that TIP60 has diverse functions involved in transcription, cellular signaling, DNA damage repair, cell cycle checkpoint control and apoptosis [2,4,5].Salmonella enterica serovar Typhimurium (S. typhimurium) causes gastrointestinal diseases in humans and typhoid-like fever in the mouse. S. typhimurium encodes two Type III secretion systems within the Salmonella pathogenicity islands 1 and 2 (SPI-1 and SPI-2) that are required for Salmonella entry and subsequent survival inside the host cells, respectively [6-10]. Following entry into the host cells, S. typhimurium replicates within a membrane-bound compartment termed Salmonella-containing vacuole (SCV). Previous studies have shown that SifA, SseF and SseG are involved in the formation of Salmonella induced filaments (Sifs) that are required for maintaining the SCV [11-13].SseF, working together
Association of ADAM33 gene polymorphisms with adult allergic asthma and rhinitis in a Chinese Han population
Dongju Su, Ximei Zhang, Hong Sui, Fuzhen Lü, Lianhong Jin, Jing Zhang
BMC Medical Genetics , 2008, DOI: 10.1186/1471-2350-9-82
Abstract: Six polymorphic sites (V4, T+1, T2, T1, S1, and Q-1) were genotyped in 128 patients with AR, 181 patients with AS, and 151 healthy controls (CTR). Genotypes were determined by the polymerase chain restriction fragment length polymorphism (PCR-RFLP) method. Data were analyzed using the chi-square test with Haploview software.The single nucleotide polymorphisms (SNPs), V4 G/C, T+1 A/G, and T1 G/A, of the ADAM33 gene may be the causal variants in AR, whereas ADAM33 V4 G/C, T2 A/G, T1 G/A, and Q-1A/G may participate in the susceptibility of AS.These results suggest that polymorphisms of the ADAM33 gene may modify individual susceptibility to AR and AS in a Chinese Han population.Rhinitis is defined as inflammation of the nasal mucosa and is characterised by nasal discharge, blockage, sneezing, and itching [1,2]. Asthma is a chronic inflammatory disorder of the airway which causes recurrent episodes of wheezing, breathlessness, chest tightness, and coughing in susceptible individuals. These episodes are usually associated with widespread, but variable airflow obstruction that is often reversible, either spontaneously or with treatment. The inflammation also causes an associated increase in existing bronchial hyper-responsiveness (BHR) to a variety of stimuli [1,2]. Epidemiologic studies have consistently shown that asthma and rhinitis often coexist in the same patients in every region of the world [3-5], suggesting the concept of 'one airway, one disease.' The basic premise is that rhinitis and asthma represent the manifestations of one syndrome in two parts of the respiratory tract [6]. In order to raise awareness of the theory of 'one airway, one disease,' the Allergic Rhinitis and Its Impact on Asthma (ARIA) Workshop Group publication proposes three considerations for patients with allergic respiratory disease [7].ADAM33 is the first reported asthma-susceptible gene identified by positional cloning [8]. ADAM33 is a complex molecule, the expression of which is largely
Accuracy of dynamic orbit determination using rebuilt space-borne\nGPS pseudo-range measurements from real-time navigation solutions
星载GPS 伪距观测量重建及定轨精度分析

PENG Dongju,HU Xiaogong,WU Bin,
彭冬菊
,胡小工,吴斌

遥感学报 , 2010,
Abstract: The method to rebuild space-borne pseudo-range measurements from real-time position data is discussed first in this paper. And then, the accuracy of dynamic orbit determination using rebuilt pseudo-range measurements and precise GPS ephemeris is analyzed in detail. Data from GRACE-A satellite from March 1 to 14 in 2008 is processed for this purpose. Research results show that the accuracy of real-time single point positioning using C/A code pseudo-range measurements and GPS broadcast ephemeris is about 15m, and the accuracy of dynamic orbit determination in post-processing mode is about 2m. It is demonstrated that dynamic orbit determination using rebuilt pseudo-range measurements in post-processing mode can not only significantly improve the position accuracy of real-time navigation solutions, but also provide consecutive satellite orbits.
Page 1 /78214
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.