基于XML的异构数据库中间件研究

设计了基于XML的异构数据库中间件系统,利用XML,CORBA,Java技术,以XML为公共数据模型,为用户提供一个统一的查询接口,查询结果以XML模式输出.该中间件系统可实现Web层的业务处理系统通信、基于CORBA的分布式对象请求调用和对异构数据库访问等功能.     

浅谈CORBA与DCOM的桥接

CORBA和DCOM都是具有软件集成功能的对象系统，CORBA与DCOM的集成可通过桥接来实现。通常，桥接有静态桥接和动态桥接2种方式：静态桥接效率高，但不适宜于大规模的系统；动态桥接采用动态机制实现，只需一个桥接接口，易维护。实现CORBA与DCOM的桥接可充分利用已有资源，大大减少软件集成的代码量，提高开发效率。     

网络印刷个性化印品数据模型的研究

通过网络平台,对个性化印品进行设计制作过程中,印品数据信息传输的完整性及规范性尤为关键.针对XML数据文件缺少统一规范等问题,本研究分析了个性化印品数据模型的建立及应用流程,采用面向对象的方式对网络个性化印品进行共性提取及个性描述,并建立相应的印品数据模型.在此基础上,根据XML Schema的语言规则及应用特点,构建个性化印品XML Schema模板,最后利用实验验证了个性化印品模板能对个性化印品数据进行约束及规范化.     

面向对象技术的组态软件实时数据库的设计与实现

结合从事组态软件设计开发的实际经验,介绍了基于面向对象技术的组态软件实时数据库系统的设计思想和实现方法,提出了利用动态连接库来建立实时数据库系统的方法,给出了数据模型和接口机制的实现方法,利用这种方法建立的实时数据库系统具有全面的开放性和很强的通用性。     

分布对象中间件中的异步机制代码生成算法研究

近年来CORBA作为一种分布对象中间件应用领域不断扩展,很多应用还离不开异步机制,而传统CORBA还无法实现异步激活。文章针对对象中间件CORBA异步机制的实现进行了较深入地探讨,并基于修改抽象语法树提出异步代码生成算法,可达到有关模型的应用需求。     

基于XML的异构数据库集成研究

本文针对异构数据库系统间信息共享与信息交换难题,深入的讨论了异构数据库的集成方法,并采用XML的异构数据库中间件技术实现异构数据库之间的信息交换,在实际应用中有着较广阔的应用前景。     

基于XML的无纸化考试系统方案设计

提出一种基于XML的试题库模型,利用XML作为结构标识、传输及转化媒介,最大限度地实现网络教育资源的共享.使用XML元数据表示试题的内容,有效地解决了试题库系统的试题类型较少和内容格式单一等问题.在试题库内容的组织上,实现了按知识点组织试题的目标,对于试题的查询、增删具有相当大的灵活性,扩大了试题的应用范围.增加了试题的应用形式.     

基于多标记有向树模型的XML文档片段相似度量方法研究

结构化查询系统和XML数据信息的融合提升了信息检索服务的有效性,改变了传统信息查询工作的低准确性、高误差局面。本文提出了一种基于多标记有向树模型的XML文档片段相似度量方法,深入了解了多标记有向树模型内容,对相似度方法中的计算节点相似度、XML匹配算法、边优化方法进行了设计,帮助用户在输入关键字后迅速搜索出高相似度的信息结果,通过实验结果表明,该方法查准率和查全率极高,实现了对信息检索技术的新提升。     

基于STEP和XML的CAPP／PDM集成研究

针对网络环境下集成CAPP／PDM的产品数据的交换和共享需要,利用STEP／XML转换器将产品模型数据交换标准文件转换为相应的可扩展标记语言中性文件,使得CAPP系统能在网络环境下获取PDM的设计数据,并能通过STEP／XML中性文件在PDM平台上进行存储,从而实现了网络环境下CAPP／PDM的有效集成。     

基于条形码的汽车维修配件追溯系统的设计

介绍了汽车维修配件市场目前存在的问题以及发展现状,提出了基于条形码的汽车维修配件追溯系统的设计思路,构建了配件质量追溯系统总体框架,以及追溯系统的具体实施业务流程,依据国际通用的编码规则,设计了基于条形码的防伪标签码,提出汽车维修配件编码,包装编码和企业编码三种编码方式,建设了以XML异构数据库系统与各企业子数据库系统进行双向同步更新与交换的信息公共追溯平台。本系统可以满足监管部门,企业,以及用户的需求,从而实现对汽车配件质量的监管与追溯,促进汽车维修配件行业的健康发展。     

Assessment of meat quality properties and development of a palatability prediction model for Korean Hanwoo steer beef

Effects of the Korean carcass-grading system on carcass traits and meat quality parameters for the longissimus dorsi (LD) and semimembranosus (SM) muscles were investigated for Hanwoo steer beef. High quality grade beef cuts had significantly higher intramuscular fat content than those of low quality grade beef cuts. To establish a guaranteed system of eating quality for Hanwoo steer beef, a palatability prediction model was developed. The model development approach used canonical discriminant analysis and multivariate regression to assess effects of muscle type, cooking method, and aging treatment on Hanwoo beef quality grade. The palatability prediction model can provide Korean consumers with detailed information about expected eating quality for an individual cut, as well as provide critical information to the industry for maintaining high-quality beef production. The model is a significant advance in grading compared with the traditional carcass grading system, which applies a single quality grade to an entire carcass.     

醪塔(丙酮-丁醇)的数学模型及操作型仿真系统的建立

本文以某厂工业醪塔(丙酮-丁醇)为对象,阐述了如何利用目前国内外先进的UNIFAC功能团法来建立精馏过程的静态数学模型,这种功能团法为缺乏实验数据的多元系统建模提供了可能性。针对醪塔模型变量多,非线性严重,不易收敛等情况,提出了一种改进的Newton-Raphson法,保证了算法的收敛性和快速性。根据工厂实际操作数据,对模型进行参数辩识和修正,结果表明模型与塔吻合良好。基于该模型,在IBM-4381机上建立了一个可用于工厂实际操作指导的仿真系统(DISSIMU-I)。并以节能节粮为目标函数,离线优化了操作条件,为工厂提高经济效益,提供了指导。最后,文章还提出了在线优化控制的初步设想。     

Carotenoids from tomatoes inhibit heterocyclic amine formation

Tomatoes are a rich source of antioxidants and they are commonly used for meat cooking in Mediterranean countries. The effects of tomato antioxidants on the formation of carcinogenic/mutagenic heterocyclic amines were investigated. A liquid model system containing as precursors creatinine, glucose and glycine in molar concentrations comparable to those present in bovine meat (chemical model system) was employed. A freeze-dried bovine meat juice (meat juice model system) was also used for some experiments. In both model systems, an inhibiting effect of tomato carotenoid fraction on the formation of imidazoquinolines (IQx, MeIQx and DiMeIQx) was observed. Using carotenoid extract at a concentration of 1000 ppm, inhibitions of 36% and 11% of IQx and MeIQx formation respectively in the chemical system and of 13% of MeIQx and of 5% of 4,8-DiMeIQx in the meat juice system was observed. The effect of the main tomato flavonoid, quercetin, was investigated using the meat juice system. Quercetin gave an inhibition of MeIQx formation between 9% and 57% with a maximum effect of 67% at 10 ppm.     

Inhibition of mutagenic 2-amino-1-methyl-6-phenylimidazo[4,5-b] pyridine (PhIP) formation using various food ingredients in a model systems

2-Amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) is a major heterocyclic amine that belongs to a class of mutagens found in foods. In this study, the inhibitory effect of food constituents on PhIP formation and its kinetics were evaluated in a model system. Adding 6 antioxidants and 4 sugars resulted in a concentrationdependent inhibition effect on PhIP formation. Epigallocatechin gallate (EGCG) (1,000 mg/L) inhibited (99.2%) of PhIP and was selected as an additive in a kinetic study. Inhibition of PhIP formation by EGCG decreased slightly with increased heating time. The rate constants and activation energy of PhIP formation increased when EGCG was added to the model system. This study has provided information for understanding the inhibition mechanisms of PhIP formation in a model system.     

Determination of NAPL-water interfacial areas in well-characterized porous media

The nonaqueous-phase liquid (NAPL)-water interfacial area is an important parameter which influences the rate of NAPL dissolution in porous media. The aim of this study was to generate a set of baseline data for specific interfacial area for a two-phase-entrapped NAPL-water system in well-characterized porous media and subsequently use these data to evaluate two current theoretical models. The first model tested distributes entrapped NAPL over the pore classes based on Land's algorithm and assumes the resulting blobs to be spherical. The other model is thermodynamically based, assuming that reversible work done on the system results in an increase in interfacial area, such that the area between drainage and imbibition retention curves can be related to the interfacial area. Interfacial tracer tests (IFTT) were used to measure specific entrapped NAPL (hexadecane)-water interfacial areas in columns packed with four grades (12/20, 20/30, 30/40, 40/50) of silica sand. By use of the anionic surfactant dihexylsulfosuccinate (Aerosol MA80), IFTT gave specific interfacial areas between 58 cm(-1) for the finest sand and 16 cm(-1) for the coarsest, compared to values of between 33 and 7 cm(-1) for the first model and between 19 and 5 cm(-1) for the thermodynamic model. Results from the literature suggest that nonspherical blobs shapes occur relatively frequently; hence it is reasonable to suggest that the assumption of spherical NAPL blobs may explain the underprediction by the first model. The thermodynamic model underestimates the interfacial area because it assumes that entrapment occurs only within the largest pores. A modified version of the latter model, allowing entrapment across all pore classes, yielded values between 58 and 13 cm(-1). Of the models tested the modified thermodynamic model best predicts the interfacial area.     

Novel transdermal drug delivery system with polyhydroxyalkanoate and starburst polyamidoamine dendrimer

In search of an efficient transdermal drug delivery system (TDDS), a polyhydroxyalkanoate (PHA)-based system with a polyamidoamine dendrimer was examined. Tamsulosin was used as the model drug. The dendrimer was found to act as the weak enhancer. By adding the dendrimer, the dendrimer-containing PHA matrix achieved the clinically required amount of tamsulosin permeating through the skin model. This is also the first report of the application of PHA and dendrimer to the TDDS.     

Three-component competitive adsorption model for flow-through PAC systems. 1. Model development and verification with a PAC/membrane system

Natural organic matter (NOM) interferes with the adsorption of trace organic compounds on porous adsorbents such as powdered activated carbon (PAC) by pore blockage and direct competition for adsorption sites. The competitive effect of NOM in flow-through systems in which the retention time of the PAC is greater than the hydraulic retention time of the system can be magnified because NOM from the influent water can continue to adsorb on the PAC retained in the system. As a result, the adsorption capacity and the diffusion coefficient of trace compounds can decrease as NOM from the influent water accumulates. In this study, a dynamic three-component adsorption model was developed to quantitatively describe the removal of a trace compound from water in flow-through PAC processes. The system was simplified by using p-dichlorobenzene (p-DCB) to represent the NOM fraction that competes directly with the target trace organic atrazine for adsorption sites and by using poly(styrene sulfonate) (PSS-1.8k) to represent large, pore-blocking NOM. The model was based on the homogeneous surface diffusion assumption with the adsorption capacity of atrazine being gradually adjusted using a simplified version of the ideal adsorbed solution theory model developed in this study. The surface diffusion coefficients of atrazine and p-DCB were modeled as a function of the surface concentration of the pore-blocking compound, PSS-1.8k. The model was verified experimentally with a PAC/microfiltration (MF) system. The use of single-solute adsorption parameters obtained from batch isotherm and kinetic tests resulted in good model predictions for the adsorption of atrazine and the two model compounds under operating conditions typical of PAC/MF systems. The model will be applied to study various operating conditions and other system parameters of PAC/membrane systems in part 2 of this study.     

构建山西旅游服饰产学研合作模式

产学研合作,是企业、高校、科研院所在优势互补、互惠互利、风险共担、共同发展的基础上开展的多种形式的合作,是优势资源整合的一种先进模式,也是科技与经济相结合的基本形式.它对促进科技成果的转化和区域创新能力的提高均有着积极的作用.作为旅游大省的山西,挖掘旅游特色服饰潜力,构建山西旅游服饰产学研合作模式,有重要意义.     

Kinetic Study on Peptide‐Bound Pyrraline Formation and Elimination in the Maillard Reaction Using Single‐ and Multiple‐Response Models

Pyrraline, an advanced glycation end product (AGE), is related to some chronic diseases and can be employed as an indicator for heat damage in food processing. In this study, the impact of changing the reactant concentration and ratio on the kinetic parameters describing peptide‐bound pyrraline (pep‐pyr) formation and elimination was evaluated in the Lys‐Gly/glucose model systems, with microwave heating treatment ranging from 120 to 200 °C. The maximum pep‐pyr concentration increased as follows: 200 °C ? 180 °C ? 160 °C ? 120 °C ? 140 °C. First, the pep‐pyr formation and elimination was modeled by using a single‐response modelling. The formation rate constant (k_F) of pep‐pyr was independent of the initial concentration of the reactants and ratios. However, the elimination rate constant of pep‐pyr (k_E) increased with increasing reactant concentrations. Second, a multiresponse modelling was performed to illustrate the pathways of pep‐pyr formation and elimination. Two adapted models can fit to the experimental data with the goodness‐of‐fit ranging from 0.663 to 0.920. Glucose‐to‐fructose isomerization rather than glucose‐to‐mannose epimerization was detected in an equimolar model system and the model system with an excess of any of the reactants. The caramelization reaction was negligible in the equimolar systems and the model systems with an excess of peptide. The reaction rate constant of glucose‐to‐fructose isomerization was independent of the initial reactant ratios. It was more difficult for pep‐pyr elimination in the model system with an excess of peptide than that in the other 2 model systems (the equimolar system and the system with an excess of glucose), whereas a reverse result in pep‐pyr formation was obtained.     

造纸企业能量系统"三环节"模型的建立及应用探讨(Ⅰ)--造纸企业"三环节"能量结构模型的建立

本文对过程能量系统综合优化技术和过程能量结构模型进行了系统的分析和研究;提出已在石化、炼油行业应用成功的"三环节"能量结构理论应用于造纸企业的能量系统综合与优化.根据"三环节"能量结构模型,对造纸企业的能量系统进行了划分,建立了造纸企业能量系统的"三环节"物理结构模型,并给出了各环节的能量平衡(火用)平衡数学方程,为造纸企业能量系统优化提供了科学依据.