检索结果-内蒙古大学图书馆

A beam flexure-based nanopositioning stage supporting laser direct-write nanofabrication

Science China(Physics,Mechanics & Astronomy) 2016年第8期59卷 50-55页

作者： Zhen Zhang Peng Wang Peng Yan YingChun Guan State Key Laboratory of Tribology and Institute of Manufacturing Engineering Department of Mechanical EngineeringTsinghua University Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Key Laboratory of High-efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical EngineeringShandong University School of Automation Science and Electrical Engineering Beihang University School of Mechanical Engineering and Automation Beihang University

A nanopositioning system of both millimetric stroke and nanometric tracking accuracy is a key component for nanofabrication in many applications. In this paper, a novel bi-axial beam-flexure nano servo stage is proposed to support a direct writing system for femtosecond laser nanofabrication. The important features of the stage lie in: a mirror symmetric instead of rotational symmetric configuration is adopted to restrict cross axis coupling, and a novel Z-shaped guidance module is proposed to achieve relative large linear stiffness range, in addition a redundant constraints module is introduced to increase off-axis stiffness of the stage. Mechanical analysis and system identification are provided, with which a feedback control algorithm demonstrates the tracking capability for laser fabrication purposes. Based on the fabricated XY nano-stage, real time control and measurements are deployed, demonstrating the millimetric operating workspace and 77.8 nm(RMS) error of tracking a circular trajectory.

关键词： laser nanofabrication direct writing servo and control system

来源：评论

学校读者我要写书评

暂无评论

Recall test for keyboard layout

Recall test for keyboard layout

引用

International Multiconference of Engineers and Computer Scientists 2016, IMECS 2016

作者： Stefanie, X.Q. Kang Tsang, Steve N.H. Chan, Alan H.S. Liu, S.L. School of Management Xi'an Jiao Tong University Key Lab Ministry of Education for Process Control and Efficiency Projects Xi'an710049 China Department of Systems Engineering and Engineering Management City University of Hong Kong Kowloon Tong Kowloon Hong Kong

ISBN: (纸本)9789881404763

In this study, the recall accuracies for different keys on a keyboard were studied and analyzed in a systematic way. It was found that alphabetic keys in the area of "Typing keys" resulted in relatively lower recall accuracies than "Function keys", "control keys" and "Numeric keys". Besides, there was an absence of significant association between the relative use frequency of English letters and their recall accuracies, confirming to the general expectation that typing tasks rely on the processing of implicit memory rather than explicit memory. Regarding the recall accuracies for numeric keys, participants had higher recall accuracy for the keys located in "Numeric keypad" than those in the "Typing key" area. This might be the result of experience transfer from their daily interaction with devices of similar layout (ATM). Some useful suggestions were provided for the design of a more user-friendly keyboard layout.

关键词： Ergonomics

来源：评论

学校读者我要写书评

暂无评论

Robust scheduling of a two-stage hybrid flow shop with uncertain interval processing times

引用

International Journal of Production Research 2016年第12期54卷 p3706-3717页

作者： Feng, Xin Zheng, Feifeng Xu, Yinfeng School of Management Xi'an Jiaotong University Xi'an China State Key Lab for Manufacturing Systems Engineering Xi'an China Ministry of Education Key Lab for Process Control and Efficiency Engineering Xi'an China Glorious Sun School of Business and Management Donghua University Shanghai P.R. China

This paper studies the makespan minimisation scheduling problem in a two-stage hybrid flow shop. The first stage has one machine and the second stage hasmidentical parallel machines. Neither the processing time nor probability distribution of the processing time of each job is uncertain. We propose a robust (min–max regret) scheduling model. To solve the robust scheduling problem, which is NP-hard, we first derive some properties of the worst-case scenario for a given schedule. We then propose both exact and heuristic algorithms to solve this problem. In addition, computational experiments are conducted to evaluate the performance of the proposed algorithms. [ABSTRACT FROM AUTHOR]

关键词： hybrid flow shop scheduling makespan minimisation min–max regret min–max regret uncertain processing times

来源：评论

学校读者我要写书评

暂无评论

Risk-averse procurement strategy in presence of strategic customer 45

Risk-averse procurement strategy in presence of strategic cu...

引用

45th International Conference on Computers and Industrial engineering, CIE 2015

作者： Shu, Lei Wu, Feng School of Management Key Lab. of the Ministry of Education for Process Control and Efficiency Engineering Experiment Center for the Teaching of Management Education Xi'an Jiaotong University Demo-Center at State Level for Experiment Teaching China

LArising in online environment lately due to frequent dynamic pricing in presence of strategic customer, pulsed demand increases the risk of a retailer as it is large and highly uncertain. Moreover, it shifts between periods because of customer strategic behavior. This paper, from the perspective of a risk-averse retailer, establishes a procurement model and a strategic customer demand model, to analyze the effects of strategic customer, pricing and risk aversion on order quantity, profit and risk. Some useful conclusions for procurement risk control are drawn in the setting of two-period. Selling price of period 1 affects order quantity of period 2, when strategic customer ratio is independent of prices;while all selling prices affect all order quantities when dependent. Order quantity in period 1 (period 2) decreases (increases) in strategic customer ratio, which would be less sensitive when the retailer is more risk-averse. Besides, risk-aversion procurement can effectively and significantly mitigate risk without much loss of profit, especially when strategic customer ratio is large.

关键词： Profitability

来源：评论

学校读者我要写书评

暂无评论

Accurate 3-D parameterised modelling of complex milling cutter with fir-slots for rotor-groove machining

引用

International Journal of Manufacturing Research 2016年第4期11卷 309-321页

作者： Su, Xiang Wang, Gang Li, Jianfeng Rong, Yiming Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua University Beijing100084 China Key Laboratory of High Efficiency and Clean Mechanical Manufacture Shandong University Ministry of Education Jinan250001 China Mechanical and Energy Engineering Department South University of Science and Technology of China Shenzhen518055 China

Milling cutters with fir-slot (fir tree cutters) are widely used in the high speed machining of blade-root and rotor-groove. The complicated structures and multitudinous specification sizes make it difficult to achieve an accurate three-dimensional (3-D) parameterised modelling of the cutter. In this paper, the conical helix and radial cross-sectional curves are expressed mathematically based on geometric curve and surface theory. The radial geometric angles are calculated from the normal angles based on the analysis of the relationship between radial section and normal section. Finally, rapid computer aided engineering (CAE) software are realised. The results show that the established mathematical model can efficiently express the fir tree cutters, which improves the efficiency and accuracy of cutter design. Copyright © 2016 Inderscience Enterprises Ltd.

关键词： Parameterization

来源：评论

学校读者我要写书评

暂无评论

Analysis of software licensing mode and compatibility choice with network externality

引用

Xitong Gongcheng Lilun yu Shijian/System engineering Theory and Practice 2015年第12期35卷 3047-3055页

作者： Zhang, Xiao-Juan Zhang, Sheng-Hao School of Management Xi'an Jiaotong University Xi'an710049 China Key Lab. of the Ministry of Education for Process Control & Efficiency Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University Xi'an710049 China

With network externality, two licensing modes-perpetual licensing mode and Softwareas-a-Service mode, and four compatibility choices-no compatibility, backward compatibility, forward compatibility and backward & forward compatibility, are considered. Consumers' purchasing decision and the vendor's pricing strategy are examined through two-stage models under each combination of licensing mode and compatibility choice. The results show that backward & forward compatibility maximizes the vendor's revenue under perpetual licensing mode, and any of no compatibility, backward compatibility and backward & forward compatibility may maximize the vendor's profit with software development costs under different compatibility choices. Under Software-as-a-Service mode, the compatibility choice has no impact on the vendor's revenue, and no compatibility maximizes the vendor's profit. When revenue maximization is the vendor's concern, perpetual licensing mode is superior to Software-as-a-Service mode;when profit maximization is the vendor's objective, Software-as-a-Service mode usually becomes better than perpetual licensing mode. © 2015, Systems engineering Society of China. All right reserved.

关键词： Profitability

来源：评论

学校读者我要写书评

暂无评论

Managing data quality for information systems combination from different data sources 19

Managing data quality for information systems combination fr...

引用

19th International Conference on Information Quality, ICIQ 2014

作者： Liu, Qi Feng, Gengzhong Wang, Nengmin School of Management Xi’an JiaoTong University China key lab of the ministry of education for process control and efficiency engineering China

来源：评论

学校读者我要写书评

暂无评论

The multilevel and multiskill labor staffing and scheduling model for data entry companies

引用

4th International Asia Conference on Industrial engineering and Management Innovation, IEMI 2013

作者： Tan, Zheng Wu, Feng Zhang, Zheng-Xiang School of Management Xi'an Jiaotong University Xi'an 710049 China Key Lab of the Ministry of Education for Process Control and Efficiency Engineering Xi'an China

ISBN: (纸本)9783642400599

Data entry, one of the basic businesses in service outsourcing, depends much on human resources. The companies need to reasonably choose and arrange staffs in order to deliver data production in time. In consideration of production process and staff skill, a two-step multilevel multiskill labor staffing and scheduling model was built. The results of the proposed model with the data from the company ICP indicated the availability of the model, which can improve the vendors' capability and the significance of promoting development of the service outsourcing industry in China. © 2014 Springer-Verlag Berlin Heidelberg..

关键词： Scheduling

来源：评论

学校读者我要写书评

暂无评论

Multi-pipeline System Scheduling under Demand Uncertainty

Multi-pipeline System Scheduling under Demand Uncertainty

引用

第26届中国过程控制会议（CPCC2015）

作者： Wang Jishuai Gu De Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences State Key Lab.of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Institute of Automation Jiangnan University

In this paper, a discrete mathematical approach to solve scheduling of multi-pipeline systems for petroleum products under demand uncertainty is presented. To deal with the uncertainty, the conditional value-at-risk(CVAR) analysis is adopted as a risk measure. Firstly an improved scheduling approach is proposed to model the multi-pipeline system with the consideration of different pipeline segment sizes. The improved formulation is computationally intractable when pipeline segments have distinct capacities. Then the model takes a scenario-based approach to cope with uncertainty in a CVAR framework. Computational results are presented to demonstrate the effectiveness of the proposed approach. All the instances are implemented using CPLEX.

关键词： Multiproduct pipeline Scheduling MILP formulation Pump

来源：评论

学校读者我要写书评

暂无评论

A Novel Adaptive Rejection control Approach for Multiple Narrow-band Disturbances in Nano-manipulating Systems

A Novel Adaptive Rejection Control Approach for Multiple Nar...

引用

The Society of Instrument and control Engineers Annual Conference 2015

作者： Zeshan Lyu Peng Yan Zhen Zhang School of Automation Science and Electrical Engineering Beihang University Key Laboratory of High-efficiency and Clean Mechanical Manufacture Ministry of Education School of Mechanical EngineeringShandong University Department of Mechanical Engineering Tsinghua University Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and Control Tsinghua University

This paper presents an innovative method for rejecting multiple narrow-band disturbances in nano-manipulating servo systems. The proposed control scheme consists of a robust controller and a multiple optimal phase filter structure. The baseline robust controller is synthesized with mixed sensitivity optimization for the purpose of robust stability and servo performance.A novel adaptive digital multiple optimal phase filter structure is then developed with a parallel connection, such that online estimation and suppression of the narrow-band disturbances with unknown or time-varying frequencies can be achieved without sacrificing the stability robustness of the closed-loop systems. The proposed control scheme is evaluated via simulations and implemented on a piezoelectric-actuator driven nanopositioner, where high precision positioning is demonstrated in the presence of both unmodeled dynamics and multiple disturbances.

关键词： multiple narrow-band disturbance rejection,piezoelectric-actuator driven nanopositioning,mixed sensitivity optimization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：