A modified Johnson-Cook model for NC warm bending of large diameter thin-walled Ti-6Al-4V tube in wide ranges of strain rates and temperatures

Numerical control（NC） warm bending is a proven strategy to form the large diameter thin-walled（LDTW） Ti-6 Al-4 V tubes, which are typical light-weight and high-performance structural components urgently required in many industries. In virtue of unveiling the thermo-mechanical coupled deformation behaviors, uniaxial tensile tests were conducted on Ti-6 Al-4 V tube within wide ranges of temperatures（25-600 ℃） and strain rates（0.00067-0.1 s～（-1））. Moreover, a modified Johnson-Cook（JC） model is proposed with a consideration of nonlinear strain rate hardening and the interaction between strain hardening and thermal softening. Resultantly, the present model gives more accurate predictions for flow stress over the entire deformation ranges and the maximum error decreases by about 90%. By employing proposed model to NC warm bending, preferable precision is obtained in predicting forming defects including fracture, wrinkling and over thinning. The present work lays foundation for the forming limit prediction and process optimization in NC warm bending of LDTW Ti-6 Al-4 V tubes.

Ontology and metadata for online learning resource repository management based on semantic web

An ontology and metadata for online learning resource repository management is constructed. First, based on the analysis of the use-case diagram, the upper ontology is illustrated which includes resource library ontology and user ontology, and evaluated from its function and implementation; then the corresponding class diagram, resource description framework （RDF） schema and extensible markup language （XML） schema are given. Secondly, the metadata for online learning resource repository management is proposed based on the Dublin Core Metadata Initiative and the IEEE Learning Technologies Standards Committee Learning Object Metadata Working Group. Finally, the inference instance is shown, which proves the validity of ontology and metadata in online learning resource repository management.

Research on workflow meta model supporting activity based costing

Activity based costing (ABC) is a method which can solve many limitations of the traditional cost systems in manufacturing management. In this paper, we investigate how to integrate ABC with workflow technology, and build a workflow meta model supporting ABC. Firstly, the concept and concept model of activity based costing (ABC) are introduced. Next, the meta model of P -PROCE (Process, Product, Resource, Organization, and Cost & Evaluation) is presented. Then the cost meta model is defined by adding ABC to P -PROCE model. Object constraint language (OCL) is used to express meta model and constraints. Finally, we show an enterprise modeling and simulation tool based on the workflow meta model. We can systematically construct an enterprise model and easily and efficiently conduct simulation. Moreover it enables us to analyze and evaluate business processes and its costs.

Implementing VMI service pricing strategy for 3PL corporation considering recovery costs

The collector managed inventory(CMI)management idea is introduced based on the comparison of manufacturer and third-party logistics(3PL)implementing vendor managed inventory(VMI)services.Considering recovery costs,the service pricing strategies for 3PL corporations implementing VMI are studied to meet two conditions of participation constraints and incentive-compatibility constraints.The numerical simulation results indicate that the supply chain partners' profits change after considering recovery costs,and the 3PL corporation's profits and the total profits increase first,and then decrease.The retailers' and manufacturers' profits also increase.The total profits of the supply chain have a characteristic of increasing first and then decreasing with the increase of the callback ratio of unsold products.The concrete extremum point is codetermined by price flexibility,service pricing of the 3PL corporation,callback price and callback ratio.

Improvements on High Current Performance of Static Induction Transistor

Methods for improving the high current performance of static induction transistor （SIT） are presented.Many important factors,such as ＂trans-conductance per unit channel width＂ θ, ＂gate efficiency＂ η, ＂sensitivity factor＂ D,and ＂intrinsic static gain＂ μ0,that may be used to describe different aspects of the electrical performance of an SIT are first defined.The dependences of electrical parameters on the structure and technological process of an SIT are revealed for the first time.The packaging technologies are so important for the improvement of high power performance of SITs that they must be paid attention.Testing techniques and circuits for measuring frequency and power parameters of SITs are designed and constructed.The influence of packaging processes in technological practice on the electrical performance of SITs is also discussed in depth.

An Application of a Multi-Tier Data Warehouse in Oil and Gas Drilling Information Management

Expenditure on wells constitute a significant part of the operational costs for a petroleum enterprise, where most of the cost results from drilling. This has prompted drilling departments to continuously look for ways to reduce their drilling costs and be as efficient as possible. A system called the Drilling Comprehensive Information Management and Application System (DCIMAS) is developed and presented here, with an aim at collecting, storing and making full use of the valuable well data and information relating to all drilling activities and operations. The DCIMAS comprises three main parts, including a data collection and transmission system, a data warehouse (DW) management system, and an integrated platform of core applications. With the support of the application platform, the DW management system is introduced, whereby the operation data are captured at well sites and transmitted electronically to a data warehouse via transmission equipment and ETL (extract, transformation and load) tools. With the high quality of the data guaranteed, our central task is to make the best use of the operation data and information for drilling analysis and to provide further information to guide later production stages. Applications have been developed and integrated on a uniform platform to interface directly with different layers of the multi-tier DW. Now, engineers in every department spend less time on data handling and more time on applying technology in their real work with the system.

Research on Optimal Delivery Days and Customer Satisfaction Based on Quality Costs

Customer satisfaction is an important index to evaluate the competitiveness and efficiency of an enterprise. Every enterprise is confront with the subject of supplying with the customer satisfactory products at the lowest costs and the highest manufacturing speed. Regarding the delivery days of a coach company as a design variable, this paper builds up an optimization model of customer satisfaction, and suggests an effective method to reduce costs and increase customer satisfaction based on analysis and research.

Logistics Cost Management Models and Their Usability for Purchasing

In many compames, cost management models are abandoned due to their complexity and because of this, the academic literature has experienced a downturn in publications regarding cost management. This paper deepens the understanding regarding the practical usability of cost management models for purchasing decisions, and provides a framework for determining a desired complexity of cost management in different purchasing environments. The complexity is defined along three dimensions identified in literature and the different purchasing environments stem from an adaptation of Kraljic＇s （1983） matrix.

Integrating Activity-Based Costing （ABC） and Theory of Constraint （TOC） for Improved and Sustained Cost Management

Implementing effective cost management approaches has recently gained momentum due to intense competition and increasing customer demands. Moreover, effective cost management approaches have contributed to firms＇ competitive advantage in relation to cost leadership strategy. Consequently, firms have implemented contemporary cost management systems, such as activity-based management, business process re-engineering, life-cycle costing, target costing, and theory of constraint （TOC）, to enable them to become low-cost producers and compete effectively and sustain their performance. Furthermore, focusing on cost management to improve profitability has led to the integration of activity-based costing （ABC） and TOC. Therefore, the aim of this study is to review literature and discuss how integration of ABC and TOC can result in improved and sustained cost management. While these methods have different approaches in addressing cost management, treating them as complementary cost management approaches can result in improved cost management due to improved product costing, improved cost reporting, improved product-mix decisions, and improved cycle-time management. Improvement in cost management will then result in sustained cost management. Sustained cost management is further enhanced with the investment in information customer and shareholder value technology that supports cross-functional decision making to continue creating to remain competitive in the market.

Application of a novel detection approach based on non-dispersive infrared theory to the in-situ analysis on indicator gases from underground coal fire

Coal mine fires,which can cause heavy casualties,environmental damages and a waste of coal resources,have become a worldwide problem.Aiming at overcoming the drawbacks,such as a low analysis efficiency,poor stability and large monitoring error,of the existing underground coal fire monitoring technology,a novel monitoring system based on non-dispersive infrared(NDIR)spectroscopy is developed.In this study,first,the measurement principle of NDIR sensor,the gas concentration calculation and its temperature compensation algorithms were expounded.Next,taking CO and CH_(4) as examples,the liner correlation coefficients of absorbance and the temperature correction factors of the two indicator gases were calculated,and then the errors of concentration measurement for CO,CO_(2),CH_(4) and C_(2)H_(4) were further analyzed.The results disclose that the designed NDIR sensors can satisfy the requirements of industrial standards for monitoring the indicator gases for coal fire hazards.For the established NDIR-based monitoring system,the NDIRbased spectrum analyzer and its auxiliary equipment boast intrinsically safe and explosion-proof performances and can achieve real-time and in-situ detection of indicator gases when installed close to the coal fire risk area underground.Furthermore,a field application of the NDIR-based monitoring system in a coal mine shows that the NDIR-based spectrum analyzer has a permissible difference from the chromatography in measuring the concentrations of various indicator gases.Besides,the advantages of high accuracy,quick analysis and excellent security of the NDIR-based monitoring system have promoted its application in many coal mines.

探讨血清中α_l-微球蛋白、同型半胱氨酸和胱抑素C在2型糖尿病肾病患者检测中的意义

目的探讨对2型糖尿病肾病患者实施相关临床指标进行检测的效果与临床意义。方法方便收集50例2型糖尿病肾病患者的临床资料予以回顾性分析研究,资料收集时间为2015年1月—2016年12月。将这50例患者设为实验组,另从同期在该院接受体检的人群中随机选择50名设为健康对照组。于清晨空腹状态下采集两组研究对象的静脉血,检测同型半胱氨酸以及胱抑素C水平。另收集两组的中段晨尿送检,采用免疫散射比浊法检测α_1-微球蛋白水平。结果两组研究对象在平均年龄以及平均体质量等方面情况基本相同,各项临床指标经比较差异无统计学意义(P>0.05)。对两组研究对象的α_1-微球蛋白、同型半胱氨酸和胱抑素C水平进行检测,记录检测结果并进行组间统计学比较可得,实验组检测水平分别为(19.85±5.02)mg/L、(15.78±3.12)μmol/L、(1.51±0.45)mg/L,均显著高于对照组的(3.75±1.27)mg/L、(9.12±2.35)μmol/L、(0.62±0.21)mg/L(P<0.05)。结论对2型糖尿病肾病患者的血清中α_1-微球蛋白、同型半胱氨酸和胱抑素C指标进行检测可较为直观的了解到患者的肾脏功能损伤情况,为临床诊治提供一定的参考依据。

Multivariate time delay analysis based local KPCA fault prognosis approach for nonlinear processes

Currently, some fault prognosis technology occasionally has relatively unsatisfied performance especially for in- cipient faults in nonlinear processes duo to their large time delay and complex internal connection. To overcome this deficiency, multivariate time delay analysis is incorporated into the high sensitive local kernel principal component analysis. In this approach, mutual information estimation and Bayesian information criterion （BIC） are separately used to acquire the correlation degree and time delay of the process variables. Moreover, in order to achieve prediction, time series prediction by back propagation （BP） network is applied whose input is multivar- iate correlated time series other than the original time series. Then the multivariate time delayed series and future values obtained by time series prediction are combined to construct the input of local kernel principal component analysis （LKPCA） model for incipient fault prognosis. The new method has been exemplified in a sim- ple nonlinear process and the complicated Tennessee Eastman （TE） benchmark process. The results indicate that the new method has suoerioritv in the fault prognosis sensitivity over other traditional fault prognosis methods.

Cost management based security framework in mobile ad hoc networks

Security issues are always difficult to deal with in mobile ad hoe networks. People seldom studied the costs of those security schemes respectively and for some security methods designed and adopted beforehand, their effects are often investigated one by one. In fact, when facing certain attacks, different methods would respond individually and result in waste of resources. Making use of the cost management idea, we analyze the costs of security measures in mobile ad hoc networks and introduce a security framework based on security mechanisms cost management. Under the framework, the network system＇s own tasks can be finished in time and the whole network＇s security costs can be decreased. We discuss the process of security costs computation at each mobile node and in certain nodes groups. To show how to use the proposed security framework in certain applications, we give examples of DoS attacks and costs computation of defense methods. The results showed that more secure environment can be achieved based on the security framework in mobile ad hoc networks.

Extension of Switching Costs Antecedents Based on Customers＇ Social Ties

The effects of customers' social ties on switching costs have recently attracted researchers' attention.This study formally included customers' social ties as a new antecedent to supplement those elucidated by Burnham in 2003.Through empirical research,this study successfully verified the reliability and validity of items created to measure social ties,and it demonstrated the facilitating effects of social ties as an antecedent on customers' procedural and relational switching costs.Finally,the study lists managerial implications aimed at retaining customers through knowledge of this added antecedent.

Cost-benefit analysis of esophageal cancer endoscopic screening in high-risk areas of China

AIM:To estimate the cost-benefit of endoscopic screening strategies of esophageal cancer(EC)in high-risk areas of China. METHODS:Markov model-based analyses were conducted to compare the net present values(NPVs)and the benefit-cost ratios(BCRs)of 12 EC endoscopic screening strategies.Strategies varied according to the targeted screening age,screening frequencies,and follow-up intervals.Model parameters were collected from population-based studies in China,published literatures,and surveillance data. RESULTS:Compared with non-screening outcomes,all strategies with hypothetical 100 000 subjects saved life years.Among five dominant strategies determined by the incremental cost-effectiveness analysis,screening once at age 50 years incurred the lowest NPV(international dollar-I$55 million)and BCR(2.52).Screening six times between 40-70 years at a 5-year interval[i.e., six times(40)f-strategy]yielded the highest NPV(I$99 million)and BCR(3.06).Compared with six times(40)fstrategy,screening thrice between 40-70 years at a 10-year interval resulted in relatively lower NPV,but the same BCR. CONCLUSION:EC endoscopic screening is cost-beneficial in high-risk areas of China.Policy-makers should consider the cost-benefit,population acceptance,and local economic status when choosing suitable screening strategies.

Quality of life and cost-effectiveness of combined therapy for reflux esophagitis

Objectiv e: To evaluate clinical,Quality of Life (QoL) and medical cost outcomes in pati ents with symptomatic reflux esophagitis (RE) receiving different ″triple c ombin ation therapy″ . Methods: A multicenter medical effectiveness trial conducte d in 10 hospitals of 5 regions in Zhejiang Province. 248 patient-volunteers were ass ig ned to 8 weeks of ″ triple combination therapy″ with Lansoprazole plus Cisapri de and Sucralfate or Ranitidine plus Cisapride and Sucralfate. Main outcomes asses sment included symptoms scale scores,RE severity,QoL at baseline and 8 weeks. Medical cost data were collected with cost analysis questionnaire. Results: (1)M ore Lansoprazole group patients noted RE symptoms resolution than Ranitidine gro up(92.3% vs 78.4%,P<0.01). There was no striking difference between two gro ups in RE healing rate (90.8% vs 82.9%, P>0.05). (2)RE significantly impaire d QoL of patients(P<0.001).Compared with Ranitidine group,QoL in Lansoprazole group had significant improvement (rate of ″good″ QoL 64.5% vs 45.6%,P<0.01). (3)T here w as close correlation between symptomic effectiveness and QoL rating scale in bot h the Lansoprazole and Ranitidine group(P<0.01,r=0.235 and 0.353 respec tively). There were no statistical difference of medical cost between the two groups ( P> 0.05). Conclusion: RE significantly impaired QoL of patients. ″Triple combinati o n therapies″ can significantly improve RE symptoms and QoL. Lansoprazole combin ation therapy was more cost-effective than Ranitidine combination group.

Study on enterprise cost strategy implementation methods

Based on comparative analysis of different perspectives related to enterprise strategic cost management or strategic management process, the author considers that the process of strategic cost management includes two major steps as strategy formulation and strategy implementation. The cost strategic management methods can be classified as cost strategy formulation methods and implementation methods according to the strategic cost management process; and the cost strategy implementation methods are divided into strategy implementation basis confirmation method, organizational implementation method, supervision （surveillance） and variance （performance） analysis ＆ adjustment method according to the contents to be implemented.

Effect of Turkish Bank Capital Structure of Basel Ⅱ Criteria

Performing the functions of the bank＇s own funds lack of funds, those living in them to pass on more of those who use and quite a large amount of capital to determine the risks and managing them are facing. Chain of crises in financial markets spread to other sectors see that starting. This phenomenon depending on the potential risks of financial market actors, and especially banks, system identification, measurement, and control needs to be increased. This is referred to as the Basel Accords, depending on the needs the agreement of risk management has emerged. At first glance, the Basel Ⅱ Accord in terms of risk management in financial institutions risk management recommendations to the perception of the principles of the Basel Ⅱ Accord, but with a specific timetable, gradually emerges as a set of rules that must be passed as risk management. Finally, the financial crisis spread across the world from the United States, how much it reveals that risk management in the financial markets. In this study, capital adequacy ratio （CAR） banks operating in Turkey＇s correlation analysis investigated the effect of the banks.

Study on Ways to Improve Economic Benefits by Strengthening Cost Management

Engineering project management refers to the management through the whole process of engineering construction, including quality, time project time limit, safety, cost, environmental protection, and innovation, etc. The most important thing for construction enterprises to improve market competitiveness is to reduce enterprise costs by decreasing resource consumption in the construction, and control the consumptions within the project budget.

Risk Simulation Modeling of Engineering Cost Based on MATLAB/SIMULINK

Based on MATLAB/SIMULINK, the paper has proposed cost risk simulation models separately in accor-dance with the circumstances of correlation and independence between the influential factors of cost risk. The mean,variance and the risk level under the above-mentioned two circumstances have also been compared with a case study.Also the sensitivity analysis of cost risk has been probed into. The result indicates that the model which takes into ac-count correlation is more objective, and the model which ignores the circumstance of correlation normally underes-timates the risk level of project cost.