基于多保真代理模型的塔机臂架结构优化

起重臂架是动臂式塔机的关键工作部件,负责提升运输建筑材料,其制造成本和工作耗能与自身重量成正比,需要对臂架的重量优化展开研究,因此提出了一种针对动臂式塔机臂架的高效优化设计方法。首先,基于有限元法,计算了不同臂架幅度下的极限工况应力及变形,确定了最危险工况,并以此工况作为优化设计的基础工况;然后,选定了臂架上12个结构参数为设计变量,进行了参数化建模,利用拉丁超立方采样(LHS)选取了样本点,基于有限元仿真数据,构建了三种基于径向基函数(RBF)的代理模型并对其精度进行了评估;最后,基于精度高的多保真代理模型(MFS),以臂架重量最小为优化目标,构建了臂架优化问题的数学模型,使用遗传算法(GA)完成了优化设计。研究结果表明:优化后的臂架满足强度、刚度要求,整个臂架不会发生断裂和失稳,而且臂架重量减轻了25.03%;同时,多保真代理模型的预测结果和仿真结果误差小于3%,证明了多保真代理模型的准确性,进而证明了基于多保真代理模型的臂架优化方法的有效性。

基于UML的医保代理集成系统业务流程分析

统一建模语言UML是一种标准的图形化建模语言。在分析了项目的背景和需求的基础上,从集成系统的特点出发,选择应用UML的用例视图、活动图及协作图对一个医保代理集成系统的业务流程进行了分析和描述。实践说明,协作图在用于描述系统的业务流程时,能较好的反映出各个子系统间的通信和协作。

履行政策性银行职能 努力促进湖北农村经济和谐健康发展

面对当前金融危机,农发行湖北省分行以科学发展观为指导,按照农发行总行党委的统一部署和安排,密切关注经济金融发展变化的新形势,找准湖北农村工作的着力点,采取有效措施,着力转变不适应、不符合科学发展要求的思想观念,着力解决影响和制约科学发展的突出问题,使农发行的各项工作更加符合科学发展观的要求,把科学发展观贯彻落实到农发行工作的各个方面,促进湖北农村经济的和谐健康发展。

Contrastive analysis and crashworthiness optimization of two composite thin-walled structures

For the safety protection of passengers when train crashes occur, special structures are crucially needed as a kind of indispensable energy absorbing device. With the help of the structures, crash kinetic-energy can be completely absorbed or dissipated for the aim of safety. Two composite structures(circumscribed circle structure and inscribed circle structure) were constructed. In addition, comparison and optimization of the crashworthy characteristic of the two structures were carried out based on the method of explicit finite element analysis(FEA) and Kriging surrogate model. According to the result of Kriging surrogate model, conclusions can be safely drawn that the specific energy absorption(SEA) and ratio of specific energy absorption to initial peak force(REAF) of circumscribed circle structure are lager than those of inscribed circle structure under the same design parameters. In other words, circumscribed circle structure has better performances with higher energy-absorbing ability and lower initial peak force. Besides, error analysis was adopted and the result of which indicates that the Kriging surrogate model has high nonlinear fitting precision. What is more, the SEA and REAF optimum values of the two structures have been obtained through analysis, and the crushing results have been illustrated when the two structures reach optimum SEA and REAF.

Organizing Independent Contractors in South Korea： A Case of Insurance Solicitors Unionizing

The purpose of this study is to understand limitations and possibilities of organizing independent contractors by focusing on insurance solicitors in South Korea. Among various types of precarious employment, insurance solicitors are an exemplar case of independent contractor jobs in Korea. According to the narrow interpretation on the employment relationship by the courts, the labor standard law does not treat insurance solicitors as workers. And, most of insurance solicitors are not affiliated with labor unions. As a result, insurance solicitors are outside labor protections. Under this context, insurance solicitors attempted to organize their own union--Korean Insurance Agents＇ Union （KIAU） in the early 2000s, and turned it into a branch of Korean Finance and Service Workers＇ Union （KFSWU） in 2004. However, the KIAU lost its membership rapidly since the mid-2000s and has failed to revitalize itself until now. So, in this study, the author focuses on the changes in the employment structure behind the growth of the insurance industry in the private sector and the reason why union organizing of independent contractors was not successful.

Control and its role in the process of ensuring knowledge continuity

With the commencement of the 21st century, the information age, knowledge economy and integration of information and knowledge among production factors, organizations show increasing interest in knowledge management. Managers are trying not only to preserve knowledge and transfer it efficiently within their organization, but also to ensure that it is not lost when a knowledge employee leaves the organization. Therefore, it is indispensable for organizations to monitor, record, transfer and preserve their knowledge. In order to ensure efficient preservation of knowledge by the organization, it is essential to integrate the area of the so-called knowledge continuity into the general management and ensure its maximum value. The goal of the article is to identify the role of control in the transformation process and its impact on ensuring knowledge continuity within the organization. A partial goal lies in identifying output quality control by means of productivity One of the conclusions of the article is that in today＇s economic situation, ignoring the existence of knowledge continuity could result in a crisis of management of knowledge and its loss.

A novel approach for agent ontology and its application in question answering

The information integration method of semantic web based on agent ontology(SWAO method) was put forward aiming at the problems in current network environment,which integrates,analyzes and processes enormous web information and extracts answers on the basis of semantics. With SWAO method as the clue,the following technologies were studied:the method of concept extraction based on semantic term mining,agent ontology construction method on account of multi-points and the answer extraction in view of semantic inference. Meanwhile,the structural model of the question answering system applying ontology was presented,which adopts OWL language to describe domain knowledge from where QA system infers and extracts answers by Jena inference engine. In the system testing,the precision rate reaches 86%,and the recalling rate is 93%. The experimental results prove that it is feasible to use the method to develop a question answering system,which is valuable for further study in more depth.

The analysis of commissioned risk in social security fund investment process

The key to sustainability of social security fund is increasing its value, while the key to increasing the value of the social security fund is income of agency entrusted investment. Agency relationship of social security Fund involves four agents, among which the entrustment between National Council for Social Security Fund （SSF） and social security fund management company is a key element. Due to information asymmetry phenomenon in the entrustment management process, the fund needed to establish the appropriate entry and exit criteria, and relying on a third party to avoid agency risks.

银行服务收费与经营转型

"经营转型方向"一直是商业银行在发展中探索的重要领域,而收费定价的合理性与规范性问题在近年也成为社会的热门话题。2012年初以来,银监会、发改委等外部监管机构对银行的服务收费进行了全面检查,并要求各商业银行对检查中发现的问题及时整改。应该说,商业银行向多元化的金融服务业务转型的方向不会动摇,而与之配套的服务定价与收费也正在不断规范与完善中。

Branched tetraether lipids in Chinese soils:Evaluating the fidelity of MBT/CBT proxies as paleoenvironmental proxies

The ubiquitous occurrence of branched glycerol dialkyl glycerol tetraethers(br GDGTs) in soils has allowed development of new proxies for reconstruction of past climate and environment. The methylation and cyclization degrees of br GDGTs, expressed as MBT and CBT, respectively, are reported to be mainly controlled by mean annual air temperature(MAAT) and soil p H. However, the br GDGT-derived temperatures and soil p H scatter widely when data from different environmental conditions are considered. In this study, we collected over 300 soil samples from China, which are representative of humid(Xishuangbanna, Guangzhou, and Shanghai), semi-arid(Dongying) and semi-arid/arid(Lanzhou, Tibetan Plateau) regions. Collectively we have the most extensive dataset that broadly characterizes the distribution of br GDGTs according to climate zones in China. The overall data demonstrate that the MBT/CBT derived temperatures better match the measured MAATs in humid and non-alkaline regions than those from regions of low MAP(<400 mm/yr) and above neutral soil p H(>7.0–7.5). Similarly, CBT describes soil p H much better in humid and non-alkaline soils than in semi-arid/arid and alkaline soils; the semi-arid/arid and alkaline soils tend to show a positive correlation between soil p H and CBT, which contradicts that in the humid and non-alkaline soils. While soil p H, MAAT and mean annual precipitation(MAP) are dominating factors controlling the br GDGT distribution across all climate zones, conductivity, total organic carbon and total nitrogen, as well as soil water content can also play an important role locally. Removing br GDGT-II resulted in a revised CBT index that provides more accurate estimation of p H, especially in semi-arid/arid and alkaline soils. The overall Chinese dataset demonstrates that continental air temperature derived from br GDGT-proxies can vastly deviate from real measurements and should be used with extreme caution in paleo-climate or-environment studies.

Optimization of the quenching method for metabolomics analysis of Lactobacillus bulgaricus

This study proposed a quenching protocol for metabolite analysis of Lactobacillus delbrueckii subsp.bulgaricus.Microbial cells were quenched with 60% methanol/water,80% methanol/glycerol,or 80% methanol/water.The effect of the quenching process was assessed by the optical density（OD）-based method,flow cytometry,and gas chromatography-mass spectrometry（GC-MS）.The principal component analysis（PCA） and orthogonal partial least squares-discriminant analysis（OPLS-DA） were employed for metabolite identification.The results indicated that quenching with 80% methanol/water solution led to less damage to the L.bulgaricus cells,characterized by the lower relative fraction of prodium iodide（PI）-labeled cells and the higher OD recovery ratio.Through GC-MS analysis,higher levels of intracellular metabolites（including focal glutamic acid,aspartic acid,alanine,and AMP） and a lower leakage rate were detected in the sample quenched with 80% methanol/water compared with the others.In conclusion,we suggested a higher concentration of cold methanol quenching for L.bulgaricus metabolomics due to its decreasing metabolite leakage.