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Retrospective analysis of 88 patients with pancreatic duct stone

Hepatobiliary & Pancreatic Diseases International 2007年第2期6卷 208-212页

作者： Li, Jian-Shui Zhang, Zhao-Da tang, yong jiang, Rong N Sichuan Med Coll Dept Gen Surg Affiliated Hosp Nanchong 637000 Peoples R China Sichuan Univ W China Hosp Dept Gen Surg Chengdu 610041 Peoples R China

BACKGROUND: Pancreatic duct stone is a rare disease, but there appears to be a rising trend in its incidence in recent years. Its pathogenesis remains unknown. The causes, diagnosis and treatment of pancreatic duct stone are reviewed through a retrospective analysis of the cases treated in our hospital. METHODS: The medical records of 88 patients with pancreatic duct stone treated in West China Hospital, Sichuan University from January 1, 1998 to November 30, 2004 were analyzed retrospectively in terms of clinical characteristics, diagnosis and treatment. RESULTS: Epigastric pain was the most common symptom in the 88 patients with an average age of 45.44 +/- 6.72 years. Various other symptoms were also observed. Eighty-one patients were subjected to B-ultrasonography, 51 to CT, and 47 to magnetic resonance cholangiopancreatography (MRCP). Fifty-six patients (63.64%) were operated on, 25 (28.41%) were treated with Chinese and Western medicine, and 7 (7.95%) abandoned treatment. Chronic pancreatitis was pathologically confirmed in all patients undergoing operation. CONCLUSIONS: B-ultrasonography is the first choice to check for pancreatic duct stone, while MRCP proves instructively useful for the diagnosis and treatment. Chronic pancreatitis is the most important cause of pancreatic duct stone, but whether there is not a direct correlation between stone formation and alcohol abuse needs further study in China. Surgery is the most curative method for pancreatic duct stone patients with severe symptoms or suspected pancreatic carcinoma, while individual treatment is emphasized, and microtraumatic surgery may be a developing option for treating pancreatic stone.

关键词： pancreatic duct stone diagnosis treatment MRCP

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Synthesis of a novel water-soluble polymeric UV-absorber for cotton

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Chinese Chemical Letters 2011年第12期22卷 1489-1491页

作者： Wei Ma Xue jiang yong Liu Bing Tao tang Shu Fen Zhan State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116023China

A water-soluble polymeric UV-absorber with polyvinylamine as backbone and benzotriazole type UV absorber as anti-UV functional group was synthesized by grafting brominated（2＇-acetoxy-5＇-methylphenyl）-2H-benzotriazole onto polyvinylamine. The intermediates and synthesized polymeric UV absorber were characterized by ~1H NMR,MS,IR and UV *** finishing properties of the polymeric UV absorber on cotton were investigated to show good UV protection property and wash fastness.

关键词： Polymeric UV-absorber Finishing Cotton UV protection property

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Extremal P_(8)-Free/P_(9)-Free Planar Graphs

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Journal of the Operations Research Society of China 2023年第3期11卷 451-457页

作者： yong-Xin Lan yong-tang Shi School of Science Hebei University of TechnologyTianjin300401China Center for Combinatorics and LPMC Nankai UniversityTianjin300071China

An H-free graph is a graph not containing the given graph H as a *** is well known that the Turán number ex(n,H)is the maximum number of edges in an H-free graph on n *** on this definition,we define ex_(P)(n,H)to restrict the graph classes to planar graphs,that is,ex_(P)(n,H)=max{|E(G)|:G∈G,where G is a family of all H-free planar graphs on n ***,we have ex_(P)(n,H)=3n−6 if the graph H is not a planar *** study is initiated by Dowden(J Graph Theory 83:213–230,2016),who obtained some results when H is considered as C_(4)or C_(5).In this paper,we determine the values of ex_(P)(n,Pk)with k∈{8,9},where Pk is a path with k vertices.

关键词： Turán number Extremal graph Planar graph

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Feedback processing in the primate brain and in AI systems

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Science China(Technological Sciences) 2024年第8期67卷 2297-2309页

作者： jiang yong HE Sheng Institute of Biophysics Chinese Academy of SciencesBeijing 100101China Institute of Artificial Intelligence Hefei Comprehensive National Science CenterHefei 230088China University of Chinese Academy of Sciences Beijing 100049China

The primate brain and artificial intelligence(AI) can both be conceptualized as information processing systems, each with its own distinct biological and computational architectures. While there are parallels between them, their respective structural and functional connections show significant differences. In this paper, we examine the central role of feedback processing in both the primate brain and AI systems, which has been shown to be crucial in shaping neural processing. By reviewing the key features of feedback processes in the primate brain, which allows the brain to incorporate prior knowledge, contextual information, and taskdemands into early-stage processing, we highlight the divergence in goals and functions between biological and AI *** these differences is crucial for elucidating the cognitive capabilities of the primate brain and for addressing computational challenges in AI. In advocating “Cognition-Inspired-Computation”, we suggest that integrating insights from feedback processing in the primate brain into AI research will offer potentially significant improvements for the advancement of AI systems.

关键词： cognitive neuroscience artificial intelligence feedback processing attention learning

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Recent Advances of Trifluoromethoxylation Reactions Using TFMS and TFBO

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Chinese Journal of Chemistry 2021年第2期39卷 255-264页

作者： Xiaohuan jiang Pingping tang State Key Laboratory and Institute of Elemento-Organic Chemistry College of ChemistryNankai UniversityTianjin300071 China

The OCF_(3)group has good metabolic stability,suitable lipophilicity and special electrical properties,which can modify the properties of drugs and material *** recent years,trifluoromethoxy compounds have received more and more *** new reagents and new trifluoromethoxylation strategies got a *** group has been committed to the development of trifluoromethoxylation reagents and *** account focuses on describing various trifluoromethoxylation reactions with trifluoromethyl sulfonates(TFMS)and(E)-O-trifluoromethyl-benzaldoximes(TFBO)developed by our group.

关键词： Trifluoromethoxylation reagents Fluorine Carbocations Radicals Synthetic methods

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Fish forewarning of comprehensive toxicity in water environment based on Bayesian sequential method

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Journal of Environmental Sciences 2021年第12期33卷 150-159页

作者： Kaifeng Rao Li tang Xin Zhang Heyu Xiang Liang tang yong Liu Wei Wang Jie jiang Mei Ma Yiping Xu Zijian Wang State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Shenzhen Monitoring Centre of Ecology and Environment Shenzhen 518049China Department of Basic Courses Beijing Union UniversityBeijing 100101China Faculty of Mathematics and Statistics Hubei UniversityWuhan 430062China CASA(Wuxi)Environmental Technology Co.Ltd. Wuxi 214024China College of Resources and Environment University of Chinese Academy of SciencesBeijing 101407China

Environmental impact of pollutants can be analyzed effectively by acquiring fish behavioral signals in water with biological behavior sensors. However, a variety of factors, such as the complexity of biological organisms themselves, the device error and the environmental noise, may compromise the accuracy and timeliness of model predictions. The current methods lack prior knowledge about the fish behavioral signals corresponding to characteristic pollutants, and in the event of a pollutant invasion, the fish behavioral signals are poorly discriminated. Therefore, we propose a novel method based on Bayesian sequential,which utilizes multi-channel prior knowledge to calculate the outlier sequence based on wavelet feature followed by calculating the anomaly probability of observed values. Furthermore, the relationship between the anomaly probability and toxicity is analyzed in order to achieve forewarning effectively. At last, our algorithm for fish toxicity detection is verified by integrating the data on laboratory acceptance of characteristic pollutants. The results show that only one false positive occurred in the six experiments, the present algorithm is effective in suppressing false positives and negatives, which increases the reliability of toxicity detections, and thereby has certain applicability and universality in engineering applications.

关键词： Bayesian sequential method Fish electrical signal Outlier detection Anomaly probability Time series forecasting

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Characteristics and Formation Mechanism for Stainless Steel Fiber with Periodic Micro-fins

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Chinese Journal of Mechanical Engineering 2016年第3期29卷 564-570页

作者： tang Tao WAN Zhenping LU Longsheng tang yong School of Mechanical and Automotive Engineering South China University of Technology

Metal fibers have been widely used in many industrial applications due to their unique advantages. In certain applications, such as catalyst supports or orthopedic implants, a rough surface or tiny outshoots on the surface of metal fibers to increase surface area are needed. However, it has not been concerned about the surface morphologies of metal fiber in the current research of metal fiber manufacturing. In this paper, a special multi-tooth tool composed of a row of triangular tiny teeth is designed. The entire cutting layer of multi-tooth tool bifurcates into several thin cutting layers due to tiny teeth involved in cutting. As a result, several stainless steel fibers with periodic micro-fins are produced simultaneously. Morphology of periodic micro-fins is found to be diverse and can be classified into three categories： unilateral plane, unilateral tapering and bilateral. There are two forming mechanisms for the micro-fins. One is that periodic burrs remained on the free side of cutting layer of a tiny tooth create micro-fins of stainless steel fiber produced by the next neighboring tiny tooth; the other is that the connections between two fibers stuck together come to be micro-fins if the two fibers are finally detached. Influence of cutting conditions on formation of micro-fins is investigated. Experimental results show that cutting depth has no significant effect on micro-fin formation, high cutting speed is conducive to micro-fin formation, and feed should be between 0.12 mm/r and 0.2 mm/r to reliably obtain stainless steel fiber with micro-fins. This research presents a new pattern of stainless steel fiber characterized by periodic micro-fins formed on the edge of fiber and its manufacturing method.

关键词： stainless steel fiber periodic micro-fins burrs chip morphology

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Physics-Informed Neural Networks with Two Weighted Loss Function Methods for Interactions of Two-Dimensional Oceanic Internal Solitary Waves

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Journal of Systems Science & Complexity 2024年第2期37卷 545-566页

作者： SUN Junchao CHEN yong tang Xiaoyan School of Mathematical Sciences Key Laboratory of Mathematics and Engineering Applications(Ministry of Education)&Shanghai Key Laboratory of PMMPEast China Normal UniversityShanghai 200241China College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China

The multiple patterns of internal solitary wave interactions(ISWI)are a complex oceanic *** remote sensing techniques indirectly detect these ISWI,but do not provide information on their detailed structure and ***,the authors considered a three-layer fluid with shear flow and developed a(2+1)Kadomtsev-Petviashvili(KP)model that is capable of describing five types of oceanic ISWI,including O-type,P-type,TO-type,TP-type,and *** learning models,particularly physics-informed neural networks(PINN),are widely used in the field of fluids and internal solitary ***,the authors find that the amplitude of internal solitary waves is much smaller than the wavelength and the ISWI occur at relatively large spatial scales,and these characteristics lead to an imbalance in the loss function of the PINN *** solve this problem,the authors introduce two weighted loss function methods,the fixed weighing and the adaptive weighting methods,to improve the PINN *** successfully simulated the detailed structure and dynamics of ISWI,with simulation results corresponding to the satellite *** particular,the adaptive weighting method can automatically update the weights of different terms in the loss function and outperforms the fixed weighting method in terms of generalization ability.

关键词： Internal solitary wave interactions KP equation PINN method weighted loss function method

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Asymptotic Variability Analysis for Multi-Server Generalized Jackson Network in Overloaded

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Acta Mathematicae Applicatae Sinica 2016年第3期32卷 713-730页

作者： yong-jiang GUO School of Science Beijing University of Posts and Telecommunications

The asymptotic variability analysis is studied for multi-server generalized Jackson network. It is characterized by law of the iterated logarithm （LIL）, which quantifies the magnitude of asymptotic stochastic fluctuations of the stochastic processes compensated by their deterministic fluid limits. In the overloaded （OL） case, the asymptotic variability is studied for five performance measures： queue length, workload, busy time, idle time and number of departures. The proof is based on strong approximations, which approximate discrete performance processes with （reflected） Brownian motions. We conduct numerical examples to provide insights on these LIL results.

关键词： Asymptotic variability generalized Jackson network (GJN) law of the iterated logarithm (LIL) strong approximation (SA)

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Fluid Approximation and Its Convergence Rate for GI/G/1 Queue with Vacations

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Acta Mathematicae Applicatae Sinica 2011年第1期27卷 43-58页

作者： yong-jiang Guo School of Science Beijing University of Posts and Telecommunications Beijing 100876 China

A GI/G/1 queue with vacations is considered in this paper. We develop an approximating technique on max function of independent and identically distributed （i.i.d.） random variables, that is max{ηi, 1 ≤ i ≤ n}. The approximating technique is used to obtain the fluid approximation for the queue length, workload and busy time processes. Furthermore, under uniform topology, if the scaled arrival process and the scaled service process converge to the corresponding fluid processes with an exponential rate, we prove by the approximating technique that the scaled processes characterizing the queue converge to the corresponding fluid limits with the exponential rate only for large N. Here the scaled processes include the queue length process, workload process and busy time process.

关键词： GI/G/1 queue with vacations fluid approximation exponential rate of convergence

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