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Study　of　Production　Planning　Fuzzy　Multi-objective　Linear　Programming　Model　with　Fuzzy　Variables

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Systems Science and Systems Engineering 1997年第3期7卷 14-20页

作者： JIN Yi xi Youmin WANG Yingluo Management school, xi’an jiaotong university, xi’an 710049 The project is supported by the National Natural Science and the Postdoctoral Science Foundation of china

To aim at the variables fuzzyness widely existing in the production planning system, the paper discusses the production planning fuzzy multi objective linear programming model with fuzzy variables, and turns it into two level multi objective linear programming problem by applying a partial order method defining the order of fuzzy numbers. finally, the paper gives its solving method.

关键词： production planning multi objective fuzzy programming

CRYSTAL　STRUCTURE　OF　A　LONG－PERIOD　ORDERED　PHASE　IN　Fe－C　MARTENSITE　AND　COMPUTER　SIMULATION　OF　ITS　ELECTRON　DIFFRACTION　PATTERNS

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Acta Metallurgica Sinica(English Letters) 1996年第1期9卷 23-26页

作者： REN xiaobing WANG xiaotian K.SHIMIZU T.TADAKI(National Laboratory of Solid State Microstructures,Nanjing university Nanjing 210093,china)(school of Materials Science and Engineering,xi’an jiaotong university xi’an 710049,china)(Kanazawa Institute of Techn Nanjing Univ Nanjing China

Different structure models of a long-period ordered phase in Fe-C martenstie formed during aging have been checked by computer simulation of electron diffraction(ED) patterns based on these *** results showed that the simulated ED pattern of γ'-FexC(Ⅱ) model proposed by the present authors is in good agreement with experimentally observed ED *** was also confirmed that the incommensurate superperiod stems from the coexistence of several γ'-Fe_xC(H) phases with different *** Fe(144)C(24)(Fe6C) model proposed by Uwakweh et *** ED patterns remarkably different from the experimental ones.

关键词： Fe-C martensite long-period ordered phase crystal structure computer simulation electron diffraction pattern

Aerodynamic Optimum Design of Transonic Turbine Cascades Using Genetic Algorithms

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Journal of Thermal Science 1997年第2期6卷 111-116页

作者： Li Jun Feng Zhenping Chang Jianzhong Shen Zuda(Institute of Turbomachinery, school of Energy & Power Engineering, xi’an jiaotong university,xi’an, Shaanxi, 710049, china) Institute of Turbomachinery School of Energy & Power Engineering Xi’an Jiaotong University Xi’an China

This paper presents an aerodynamic optimum design method for transonic turbine cascades based on the Genetic Algorithms coupled to the inviscid flow Euler solver and the boundary-layer *** Genetic Algorithms control the evolution of a population of cascades towards an optimum *** fitness value of each string is evaluated using the flow solver. The design procedur6 has been developed and the behavior of the genetic algorithms has been tested. The objective functions of the design examples are the minimum mean-square deviation between the aimed pressure and computed pressure and the minimum amount of user expertise.

关键词： genetic algorithms transonic turbine cascades optimum design

An efficient and impartial online algorithm for kidney assignment network

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Journal of Pharmaceutical Analysis 2009年第1期21卷 17-21页

作者： Yu-jue Wang, Jia-yin Wang, Pei-jia Tang, Yi-tuo Ye school of Electronic and Information Engineering, xi’an jiaotong university, xi’an 710049, china school of Electronic and Information Engineering Xi'an Jiaotong University Xi'an 710049 China

An online algorithm balancing the efficiency and equity principles is proposed for the kidney resource assignment when only the current patient and resource information is known to the assignment network. In the algorithm, the assignment is made according to the priority, which is calculated according to the efficiency principle and the equity principle. The efficiency principle is concerned with the post-transplantation immunity spending caused by the possible post-operation immunity rejection and patient’s mental depression due to the HLA mismatch. The equity principle is concerned with three other factors, namely the treatment spending incurred starting from the day of registering with the kidney assignment network, the post-operation immunity spending and the negative effects of waiting for kidney resources on the clinical efficiency. The competitive analysis conducted through computer simulation indicates that the efficiency competitive ratio is between 6.29 and 10.43 and the equity competitive ratio is between 1.31 and 5.21, demonstrating that the online algorithm is of great significance in application.

关键词： kidney resource assignment decision-making online algorithm competitive analysis

Predictors of portal vein thrombosis after splenectomy in patients with cirrhosis

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World Journal of Hepatology 2024年第2期16卷 241-250页

作者： Ting Li Li-Li Wang Ya-Ping Li Jian Gan xi-Sheng Wei xiao-Rong Mao Jun-Feng Li Department of Infectious Diseases The Second Affiliated Hospital of Xi’an Jiaotong UniversityXi’an 710000Shaanxi ProvinceChina Department of Radiology First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Gastroenterology Yantai Affiliated Hospital of Binzhou Medical UniversityYantai 264100Shandong ProvinceChina Department of Infectious Diseases The First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina

BACKGROUND Portal vein thrombosis(PVT)is a commonthsn complication after splenectomy in patients with ***,the predictors of postoperative PVT are not *** To investigate the predictors of PVT after splenectomy in patient with *** A total of 45 patients with cirrhosis who underwent splenectomy were consecutively enrolled from January 2017 to December *** incidence of PVT at 1 months,3 months,and 12 months after splenectomy in patients with cirrhosis was *** hematological indicators,biochemical and coagulation parameters,and imaging features were recorded at baseline and at each observation *** univariable,multivariable,receiver operating characteristic curve and timedependent curve analyses were *** The cumulative incidence of PVT was 40.0%,46.6%,and 48.9%at 1 months,3 months,and 12 months after *** analysis showed that portal vein diameter(PVD)≥14.5 mm and monthsdel end-stage liver disease(MELD)score>10 were independent predictors of PVT at 1 months,3 months,and 12 months after splenectomy(P10(P10 were independent predictors of PVT at 1 months,3 months,and 12 months after splenectomy in patient with cirrhosis.

关键词： Cirrhosis Splenectomy Portal vein thrombosis Predictors

STUDY ON TURBOMACHINERY PERFORMANCE PREDICTION WITH NEURAL NETWORKS

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Chinese Journal of Mechanical Engineering 2000年第1期13卷 52-57页

作者： Fan Huiyuan xi Guang Wang Shangjin (SER Turbomachinery Research Center school of Power and Energy Engineering, xi’an jiaotong university) 西安交通大学陕西西安

Traditional methods for performance prediction of a turbomachinery are usually based on certain computations from a set of data obtained in limited experiment measurements of the machine, or the machinemodels. Since the computational (mathematical) models used in such performance prediction are often crude, most of the predicted results are only correct in very small ranges around the known data points. Beyond the limited ranges, the accuracy of the resultant predictions decrease abruptly. Therefore, an alternative approach, neural network technique, is studied for performance prediction of turbomachinery. The new approach has been applied to two typical performance prediction cases to verify its feasibility and reliability.

关键词： BP neural networks Turbomachine Performance prediction

A PCA-based method for ancestral informative markers selection in structured populations

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Science china(Life Sciences) 2009年第10期52卷 972-976页

作者： ZHANG Feng1,3, ZHANG Lei1,3 & DENG Hong-Wen1,2,3 1 Key Laboratory of Biomedical Information Engineering of Ministry of Education, Institute of Molecular Genetics, school of Life Science and Technology, xi’an jiaotong university, xi’an 710049, china 2 Institute of Bioscience and Biotechnology, school of Science, Beijing jiaotong university, Beijing 100044, china 3 Departments of Orthopedic Surgery and Basic Medical Science, school of Medicine, university of Missouri-Kansas City, Kansas City, MO 64108, USA 1. Key Laboratory of Biomedical Information Engineering of Ministry of Education Institute of Molecular Genetics School of Life Science and Technology Xi’an Jiaotong University Xi’an 710049 China 3. Departments of Orthopedic Surgery and Basic Medical Science School of Medicine University of Missouri-Kansas City Kansas City MO 64108 USA 2. Institute of Bioscience and Biotechnology School of Science Beijing Jiaotong University Beijing 100044 China

Identification of population structure can help trace population histories and identify disease genes. Structured association (SA) is a commonly used approach for population structure identification and association mapping. A major issue with SA is that its performance greatly depends on the informa-tiveness and the numbers of ancestral informative markers (AIMs). Present major AIM selection meth-ods mostly require prior individual ancestry information, which is usually not available or uncertain in practice. To address this potential weakness, we herein develop a novel approach for AIM selection based on principle component analysis (PCA), which does not require prior ancestry information of study subjects. Our simulation and real genetic data analysis results suggest that, with equivalent AIMs, PCA-based selected AIMs can significantly increase the accuracy of inferred individual ancestries compared with traditionally randomly selected AIMs. Our method can easily be applied to whole genome data to select a set of highly informative AIMs in population structure, which can then be used to identify potential population structure and correct possible statistical biases caused by population stratification.

关键词： population structure principle component analysis ancestral informative markers

Experimental Investigation of Transient Heat Transferin the Once-Through Boiler Water Separator

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Journal of Thermal Science 1997年第1期6卷 44-50页

作者： Yang Dong Chen Tingkuan Zheng Jianxu(National Laboratory of Multiphase Flow in Power Engineering, xi’an jiaotong university, xi’an,710049, china) National Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China

The transient heat transfer between working fluid and inner wall of 600 MW supercritical pressureboiler's water separator model during start-up was experimentally explored. The test conditions forwater steam two-phase were as follows: pressure P = 3 ~ 11 MPa, mass now M = 0.2 ~ 0.35 kg/s,and mass quality x = O.2 ~ 0.8; for subcooled water P = 3 ~ 11 MPa, M = 0.2 ~ 0.35 kg/s, andsubcooled degree △θ = 10℃. By using an accurate and tractable inverse heat conduction solution,the correlations of single phase and twouphase transient heat transfer coefficients were obtained. Theexperimental results demonstrated the heat transfer enhanced for subcooled water and water steammixture compared with fully developed turbulent flow in tube. The increasing heat transfer effect maybe attributed to the deformation or destruction f the boundary layer.

关键词： experimental investigation water separator inverse heat conduction transient heat transfer

Preparation and Properties of Macroporous Silicon Nitride Ceramics by Gelcasting and Carbonthermal Reaction

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Journal of Materials Science & Technology 2005年第6期21卷 894-898页

作者： Wen ZHANG, Hongjie WANG+ and Zhihao JIN State Key Laboratory for Mechanical Behavior of Materials, school of Materials Science and Engineering, xi’an jiaotonguniversity, xi’an 710049, china State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China

Macroporous silicon nitride （Si3N4） ceramics with high strength, uniform structure and relatively high porosity were obtained by gelcasting and carbonthermal reaction in a two-step sintering technique. Microstructure and composition were investigated by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray diffraction （XRD）. Open porosity, pore size distribution and basic mechanical performance were measured by Archimedes method, mercury intrusion porosimetry and three-point bending methods, respectively. SEM and TEM results revealed that pores were formed by elongated β-Si3N4. SADP measurement proved the formation of SiC particles. The SiC granules were beneficial for the formation of high ratio elongated β-Si3N4, and at proper amount, they also acted as reinforcement phase. Thermodynamic analysis indicated that the mechanisms of the reactions were mainly associated with liquid-solid reaction and gas-liquid reaction.

关键词： Ceramics Silicon nitride Silicon carbide X-ray diffraction