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Search Results: 1 - 10 of 27270 matches for " Jiong Yi "
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Initial Alignment for SINS based on Low-cost IMU
Jiong Yi,Lei Zhang,Rong Shu,Jianyu Wang
Journal of Computers , 2011, DOI: 10.4304/jcp.6.6.1080-1085
Abstract: The initial alignment is vital to the strapdown inertial navigation system (SINS). In this work, an efficient initial alignment method for SINS based on a six-degree of freedom inertial measurements unit (IMU) is proposed. The three dimensional linear accelerations and angular rates are acquired from a data acquisition board which contains a low-cost IMU. Preprocess the gyro data and modeling the SINS error model for initial alignment. Analysis the observability of this SINS error model and then simplify the model based on the observability. A kalman filter is conducted to estimate the misalignment angle. The results show that the initial alignment method proposed in this paper is advisable for a SINS based on low-cost IMU on a stationary base.
Seeding ice growth at ambient conditions using nano graphene oxide
Yi Zheng,C. L. Su,Jiong Lu,Kian Ping Loh
Physics , 2013,
Abstract: Water wetting on a hydrophobic surface at ambient conditions is disallowed by the nonpolar nature of the surface and high vapor pressure of water. However, the presence of sub-millimeter sized hydrophilic patches allows the waxy wings of desert beetles to become wettable by morning mist. Here, we show that a sprinkle of graphene oxide nanoflakes (nanoGOs) is effective in condensing water nanodroplets and seeding ice epitaxy on graphite at ambient conditions. By controlling relative humidity and nanoGO density, we are able to study the formation of a complete ice wetting layer on a time scale of 20 hours. This presents an unprecedented opportunity to visualize ice nucleation and growth in real time using non-contact atomic force microscopy. The stages of crystallization, as proposed by Ostwald in 1897, is fully unfolded at a microscopic level for the first time. We obtain real-time imaging of sequential phase transition from amorphous ice to a transient cubic ice Ic stage and finally to the stable hexagonal ice Ih. Most interestingly, we discover that ice nucleation and growth can be influenced by modifying the functional groups of nanoGO, and by intermolecular hydrogen-bonding between nanoGOs. This affords a strategy to control heterogenous ice nucleation and snow crystal formation.
A Study of Performance Optimization Method for Massive Spaito-temporal Data Based on Spatio-temporal Partition Clustering
基于时空分区聚簇的海量时空数据性能优化方法研究

XIE Jiong,LIU Ren-yi,LIU Nan,
谢炯
,刘仁义,刘南

中国图象图形学报 , 2006,
Abstract: Integrative management of massive spatio-temporal data and the relevant capabilities for time series analysis are important research targets of new generation GIS software architecture.At present,access efficiency of spatial and spatio-temporal data based on seamless massive table mechanism needs solid improvement.For managing massive spatio-temporal data effectively and improving spatio-temporal search performance,partitioning and clustering method of large object-relational database platform are extended to spatio-temporal dimension,and performance optimization method for massive spaito-temporal data based on spatio-temporal partition clustering is presented,which is based on extended relational spatio-temporal data model.The search efficiency test on single table of 2GB to 60GB shows that STPC provides better spaito-temporal search performance(about 10.1%) than the normal data organization methods.
Direct nonlinear controller design using virtual reference and support vector machine
用虚拟目标值和支持向量机直接设计非线性控制器

LI Yi-guo,SHEN Jiong,
李益国
,沈 炯

控制理论与应用 , 2009,
Abstract: Indirect methods are usually employed to design control systems for complicated industrial processes, which is often time-consuming because the process model must be obtained first by identification methods. Motivated by the virtual reference feedback tuning (VRFT) method, we propose a new direct nonlinear controller design method using virtual reference (VR) and support vector machine (SVM). Firstly, the relation between VRFT and internal model control (IMC) is analyzed; and then, the structure and design procedure of the proposed nonlinear controller are given. Simulation results demonstrate that this method can effectively deal with the noise and nonlinearity, and can eliminate the steady-state error. Moreover, the amount of calculation is reduced significantly in comparison with the normal indirect model reference control method using neural networks.
The Design of the Immune Control System for Thermal Engineering Process and Its Stability Analysis
热工过程的免疫控制系统设计及稳定性分析

WU Jie,SHEN Jiong,LI Yi-guo,
吴婕
,沈炯,李益国

控制理论与应用 , 2009,
Abstract: Motivated by biological immune feedback models, we derive a novel immune feedback controller for thermal processes. First, relations among antigens, T-cells and B-cells are relatively completely imitated and a new nonlinear function describing the reaction between the restrained T-cells and B-cells is proposed, and then, the Popov super-stability analyses for two types of thermal process immune control systems are presented respectively. The nonlinear gain of the control system is determined and the design scale of IFC parameters is derived by extending the Popov super-stability from image solution to analytical solution. Finally, simulation results of the self-balanced superheated stream immune control system and the non-balanced water immune control system confirm the analytical solution validity of parameter scope through identifying the processes and analyzing the control system with Popov super-stability theory. The simulation results of thermal process immune control systems with tracking performance show that the proposed immune control system for thermal process is satisfactory.
Research on Architecture of Grid Computing System
网格互联组网的一种结构模式研究

ZHANG Huan-jiong,ZHONG Yi-xin,
张焕炯
,钟义信

计算机科学 , 2010,
Abstract: Grid computation is a branch of computer science researching,the main idea is how to integrate some diffe-rent computation capabilities in different geographical positions,furthermore to unify them as a virtual super computer.We researched the architecture and performances of Grid internet,especially,the characters of the new protocols and the sharing of resources were studied,the distributing computation and parallel computation,the co-operating performance and the intelligent performance were discussed to...
Research on the Intelligent Schedule Measure of Grid Network
网格网的智能化调度研究

ZHANG Huan-jiong,ZHONG Yi-xin,
张焕炯
,钟义信

计算机科学 , 2010,
Abstract: The asset management and schedule measure in Grid computing system are the key technologies of describing the network souses, network management and task assignment. In this paper, the intelligent schedule measure in Grid Internet system was researched, the essential conditions of realizing intelligent schedule measure were discussed, furthermore,one intelligent schedule measure was pointed out.
Factors predicting survival in patients with proximal gastric carcinoma involving the esophagus
Yi-Fen Zhang,Jiong Shi,Hui-Ping Yu,An-Ning Feng
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i27.3602
Abstract: AIM: To investigate the clinicopathologic features which predict surgical overall survival in patients with proximal gastric carcinoma involving the esophagus (PGCE). METHODS: Electronic pathology database established in the Department of Pathology of the Nanjing Drum Tower Hospital was searched for consecutive resection cases of proximal gastric carcinoma over the period from May 2004 through July 2009. Each retrieved pathology report was reviewed and the cases with tumors crossing the gastroesophageal junction line were selected as PGCE. Each tumor was re-staged, following the guidelines on esophageal adenocarcinoma, according to the 7th edition of the American Joint Commission on Cancer Staging Manual. All histology slides were studied along with the pathology report for a retrospective analysis of 13 clinicopathologic features, i.e., age, gender, Helicobacter pylori (H. pylori) infection, surgical modality, Siewert type, tumor Bormann’s type, size, differentiation, histology type, surgical margin, lymphovascular and perineural invasion, and pathologic stage in relation to survival after surgical resection. Prognostic factors for overall survival were assessed with uni- and multi-variate analyses. RESULTS: Patients’ mean age was 65 years (range: 47-90 years). The male: female ratio was 3.3. The 1-, 3- and 5-year overall survival rates were 87%, 61% and 32%, respectively. By univariate analysis, age, male gender, H. pylori, tumor Bormann’s type, size, histology type, surgical modality, positive surgical margin, lymphovascular invasion, and pT stage were not predictive for overall survival; in contrast, perineural invasion (P = 0.003), poor differentiation (P = 0.0003), > 15 total lymph nodes retrieved (P = 0.008), positive lymph nodes (P = 0.001), and distant metastasis (P = 0.005) predicted poor post-operative overall survival. Celiac axis nodal metastasis was associated with significantly worse overall survival (P = 0.007). By multivariate analysis, ≥ 16 positive nodes (P = 0.018), lymph node ratio > 0.2 (P = 0.003), and overall pathologic stage (P = 0.002) were independent predictors for poor overall survival after resection. CONCLUSION: Patients with PGCE showed worse overall survival in elderly, high nodal burden and advanced pathologic stage. This cancer may be more accurately staged as gastric, than esophageal, cancer.
Two-stage vs single-stage management for concomitant gallstones and common bile duct stones
Jiong Lu,Yao Cheng,Xian-Ze Xiong,Yi-Xin Lin
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i24.3156
Abstract: AIM: To evaluate the safety and effectiveness of two-stage vs single-stage management for concomitant gallstones and common bile duct stones. METHODS: Four databases, including PubMed, Embase, the Cochrane Central Register of Controlled Trials and the Science Citation Index up to September 2011, were searched to identify all randomized controlled trials (RCTs). Data were extracted from the studies by two independent reviewers. The primary outcomes were stone clearance from the common bile duct, postoperative morbidity and mortality. The secondary outcomes were conversion to other procedures, number of procedures per patient, length of hospital stay, total operative time, hospitalization charges, patient acceptance and quality of life scores. RESULTS: Seven eligible RCTs [five trials (n = 621) comparing preoperative endoscopic retrograde cholangiopancreatography (ERCP)/endoscopic sphincterotomy (EST) + laparoscopic cholecystectomy (LC) with LC + laparoscopic common bile duct exploration (LCBDE); two trials (n = 166) comparing postoperative ERCP/EST + LC with LC + LCBDE], composed of 787 patients in total, were included in the final analysis. The meta-analysis detected no statistically significant difference between the two groups in stone clearance from the common bile duct [risk ratios (RR) = -0.10, 95% confidence intervals (CI): -0.24 to 0.04, P = 0.17], postoperative morbidity (RR = 0.79, 95% CI: 0.58 to 1.10, P = 0.16), mortality (RR = 2.19, 95% CI: 0.33 to 14.67, P = 0.42), conversion to other procedures (RR = 1.21, 95% CI: 0.54 to 2.70, P = 0.39), length of hospital stay (MD = 0.99, 95% CI: -1.59 to 3.57, P = 0.45), total operative time (MD = 12.14, 95% CI: -1.83 to 26.10, P = 0.09). Two-stage (LC + ERCP/EST) management clearly required more procedures per patient than single-stage (LC + LCBDE) management. CONCLUSION: Single-stage management is equivalent to two-stage management but requires fewer procedures. However, patient’s condition, operator’s expertise and local resources should be taken into account in making treatment decisions.
The genus Keilbachia Mohrig from Mainland China, with descriptions of two new species (Diptera, Sciaridae)
Su-Jiong Zhang,Junhao Huang,Hong Wu,Yi-Ping Wang
ZooKeys , 2010, DOI: 10.3897/zookeys.52.362
Abstract: Seven species of Keilbachia Mohrig are recognized, and among them, two new species, K. subacumina Wu & Zhang, sp. n. and K. fengyangensis Wu & Zhang, sp. n. are described and illustrated. Five species, K. orthonema, K. flagrispina, K. demssia, K. oligonema and K. acumina are reported for the first time from China. A key to the 15 Chinese species of this genus is also provided.
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