The paper gives a brief analysis of the color harmony aesthetic measure of Spencer which was emerged in the industry art age, and points out shortcomings of the early studies. It studies order factors which affect the...The paper gives a brief analysis of the color harmony aesthetic measure of Spencer which was emerged in the industry art age, and points out shortcomings of the early studies. It studies order factors which affect the color harmony aesthetic measure based on the psychophysical method, and presents a continuous curve of the order factors. These are necessary for true color CAD, and are an essential research for automatic design leading to economic and social benefits. Key words paired comparison - color harmony - aesthetic measure - order factor展开更多
Fuzzy sets theory cannot describe the neutrality degreeof data, which has largely limited the objectivity of fuzzy time seriesin uncertain data forecasting. With this regard, a multi-factor highorderintuitionistic fuz...Fuzzy sets theory cannot describe the neutrality degreeof data, which has largely limited the objectivity of fuzzy time seriesin uncertain data forecasting. With this regard, a multi-factor highorderintuitionistic fuzzy time series forecasting model is built. Inthe new model, a fuzzy clustering algorithm is used to get unequalintervals, and a more objective technique for ascertaining membershipand non-membership functions of the intuitionistic fuzzy setis proposed. On these bases, forecast rules based on multidimensionalintuitionistic fuzzy modus ponens inference are established.Finally, contrast experiments on the daily mean temperature ofBeijing are carried out, which show that the novel model has aclear advantage of improving the forecast accuracy.展开更多
In this paper, we present the first order perturbation bounds for the SR factorization with respect to left multiplicative perturbation, and the first order and rigorous perturbation bounds for this factorization with...In this paper, we present the first order perturbation bounds for the SR factorization with respect to left multiplicative perturbation, and the first order and rigorous perturbation bounds for this factorization with respect to right multiplicative perturbation.Moreover, taking the properties of SR factors into consideration, we also provide some refined perturbation bounds.展开更多
This paper presents an analytical solution to the unsteady flow of the second-order non-Newtonian fluids by the use of intergral transformation method. Based on the numerical results, the effect of non-Newtonian coeff...This paper presents an analytical solution to the unsteady flow of the second-order non-Newtonian fluids by the use of intergral transformation method. Based on the numerical results, the effect of non-Newtonian coefficient Hc and other parameters on the flow are analysed. It is shown that the annular flow has a shorter characteristic time than the general pipe flow while the correspondent velocity, average velocity have a ... nailer value for a given Hc. Else, when radii ratio keeps unchanged, the shear stress of inner wall of annular flow will change with the inner radius -compared with the general pipe flow and is always smaller than that of the outer wall.展开更多
The idle time which is part of the order fulfillment time is decided by the number of items in the zone; therefore the item assignment method affects the picking efficiency. Whereas previous studies only focus on the ...The idle time which is part of the order fulfillment time is decided by the number of items in the zone; therefore the item assignment method affects the picking efficiency. Whereas previous studies only focus on the balance of number of kinds of items between different zones but not the number of items and the idle time in each zone. In this paper, an idle factor is proposed to measure the idle time exactly. The idle factor is proven to obey the same vary trend with the idle time, so the object of this problem can be simplified from minimizing idle time to minimizing idle factor. Based on this, the model of item assignment problem in synchronized zone automated order picking system is built. The model is a form of relaxation of parallel machine scheduling problem which had been proven to be NP-complete. To solve the model, a taboo search algorithm is proposed. The main idea of the algorithm is minimizing the greatest idle factor of zones with the 2-exchange algorithm. Finally, the simulation which applies the data collected from a tobacco distribution center is conducted to evaluate the performance of the algorithm. The result verifies the model and shows the algorithm can do a steady work to reduce idle time and the idle time can be reduced by 45.63% on average. This research proposed an approach to measure the idle time in synchronized zone automated order picking system. The approach can improve the picking efficiency significantly and can be seen as theoretical basis when optimizing the synchronized automated order picking systems.展开更多
为有效预防民用航空产品制造过程中的人因差错事件,以人的因素分析与分类系统(Human Factors Analysis and Classification System,HFACS)为理论基础,揭示各致因因素间的复杂耦合机制。首先,基于HFACS-ME简化模型,通过整合98个四级指标...为有效预防民用航空产品制造过程中的人因差错事件,以人的因素分析与分类系统(Human Factors Analysis and Classification System,HFACS)为理论基础,揭示各致因因素间的复杂耦合机制。首先,基于HFACS-ME简化模型,通过整合98个四级指标构建了适用于航空产品的产线分析模型,并利用该模型对某航空维修(Maintenance,Repair&Overhaul,MRO)企业民用航空产品生产线中的人因差错事件进行分类分析;其次,通过卡方检验识别出具有统计学显著性的强相关致因组,结合让步比分析与基于条件概率的权重分配,定量划分指标组间的影响程度;再次,应用决策试验与评估实验法(Decision-Making Trial and Evaluation Laboratory,DEMATEL)确定指标组间的因果关系与依赖程度,并采用逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)对关键指标进行排序,识别出引发人因差错事件的高重要度因素,进一步分析揭示了潜在的事故致因路径,并提出基于切断致因路径的风险预防建议;最后,通过某MRO企业民用航空产品制造产线的225例人因差错事件对方法进行验证。结果表明:此分析方法共识别出11对强相关致因组、2项高中心度致因因素及5项高原因度因素,总结出6条易导致人因差错的事故致因路径;可以证明人因差错事件并非孤立存在,管理层面因素、不安全行为前提条件与不安全行为之间存在显著因果关系。展开更多
The molecular-dynamics (MD) simulation was carried out to investigate the structure of medium-range order (MRO) of a liquid Al 5Fe 2 alloy. Prepeak is observed in the structure factor S(Q), which is considered as the ...The molecular-dynamics (MD) simulation was carried out to investigate the structure of medium-range order (MRO) of a liquid Al 5Fe 2 alloy. Prepeak is observed in the structure factor S(Q), which is considered as the signature of MRO. Results from MD simulation and experiment agree well with each other, which proves reliability of the simulation. It is found from the calculated Ashcroft-Langreth structure factors that there exists strong interactional force between atom Al and Fe, which results in the great concentration fluctuation, i.e. the chemical order, in the liquid Al 5Fe 2. Both the chemical order parameter, α , and the Bhatis-Thornton(BT)structure factors indicate the preference for unlike-neighbor bonds. It is seen from the low-Q domain of S(Q) and the concentration-concentration structure factor S CC(Q) that the prepeak mainly comes from the first peak of S CC(Q). The structural model, which reflects the characteristic of MRO, is also constructed .展开更多
This paper derives the expressions for the ordering degree and the modulation factor of A and B atoms in AXB1-xC epilayers of ternary III-V semiconductor alloys. Using these expressions, it identifies quantitatively t...This paper derives the expressions for the ordering degree and the modulation factor of A and B atoms in AXB1-xC epilayers of ternary III-V semiconductor alloys. Using these expressions, it identifies quantitatively the alternating atom-enhanced planes, compositional modulations, atomic ordering degree on the group-III sublattices and the fine structure of NMR spectra.展开更多
文摘The paper gives a brief analysis of the color harmony aesthetic measure of Spencer which was emerged in the industry art age, and points out shortcomings of the early studies. It studies order factors which affect the color harmony aesthetic measure based on the psychophysical method, and presents a continuous curve of the order factors. These are necessary for true color CAD, and are an essential research for automatic design leading to economic and social benefits. Key words paired comparison - color harmony - aesthetic measure - order factor
基金supported by the National Natural Science Foundation of China(61309022)
文摘Fuzzy sets theory cannot describe the neutrality degreeof data, which has largely limited the objectivity of fuzzy time seriesin uncertain data forecasting. With this regard, a multi-factor highorderintuitionistic fuzzy time series forecasting model is built. Inthe new model, a fuzzy clustering algorithm is used to get unequalintervals, and a more objective technique for ascertaining membershipand non-membership functions of the intuitionistic fuzzy setis proposed. On these bases, forecast rules based on multidimensionalintuitionistic fuzzy modus ponens inference are established.Finally, contrast experiments on the daily mean temperature ofBeijing are carried out, which show that the novel model has aclear advantage of improving the forecast accuracy.
基金Supported by the National Natural Science Foundation of China(Grant No.11201507)
文摘In this paper, we present the first order perturbation bounds for the SR factorization with respect to left multiplicative perturbation, and the first order and rigorous perturbation bounds for this factorization with respect to right multiplicative perturbation.Moreover, taking the properties of SR factors into consideration, we also provide some refined perturbation bounds.
文摘This paper presents an analytical solution to the unsteady flow of the second-order non-Newtonian fluids by the use of intergral transformation method. Based on the numerical results, the effect of non-Newtonian coefficient Hc and other parameters on the flow are analysed. It is shown that the annular flow has a shorter characteristic time than the general pipe flow while the correspondent velocity, average velocity have a ... nailer value for a given Hc. Else, when radii ratio keeps unchanged, the shear stress of inner wall of annular flow will change with the inner radius -compared with the general pipe flow and is always smaller than that of the outer wall.
基金Supported by Independent Innovation Foundation of Shandong University of China(Grant No.2013GN007)
文摘The idle time which is part of the order fulfillment time is decided by the number of items in the zone; therefore the item assignment method affects the picking efficiency. Whereas previous studies only focus on the balance of number of kinds of items between different zones but not the number of items and the idle time in each zone. In this paper, an idle factor is proposed to measure the idle time exactly. The idle factor is proven to obey the same vary trend with the idle time, so the object of this problem can be simplified from minimizing idle time to minimizing idle factor. Based on this, the model of item assignment problem in synchronized zone automated order picking system is built. The model is a form of relaxation of parallel machine scheduling problem which had been proven to be NP-complete. To solve the model, a taboo search algorithm is proposed. The main idea of the algorithm is minimizing the greatest idle factor of zones with the 2-exchange algorithm. Finally, the simulation which applies the data collected from a tobacco distribution center is conducted to evaluate the performance of the algorithm. The result verifies the model and shows the algorithm can do a steady work to reduce idle time and the idle time can be reduced by 45.63% on average. This research proposed an approach to measure the idle time in synchronized zone automated order picking system. The approach can improve the picking efficiency significantly and can be seen as theoretical basis when optimizing the synchronized automated order picking systems.
文摘为有效预防民用航空产品制造过程中的人因差错事件,以人的因素分析与分类系统(Human Factors Analysis and Classification System,HFACS)为理论基础,揭示各致因因素间的复杂耦合机制。首先,基于HFACS-ME简化模型,通过整合98个四级指标构建了适用于航空产品的产线分析模型,并利用该模型对某航空维修(Maintenance,Repair&Overhaul,MRO)企业民用航空产品生产线中的人因差错事件进行分类分析;其次,通过卡方检验识别出具有统计学显著性的强相关致因组,结合让步比分析与基于条件概率的权重分配,定量划分指标组间的影响程度;再次,应用决策试验与评估实验法(Decision-Making Trial and Evaluation Laboratory,DEMATEL)确定指标组间的因果关系与依赖程度,并采用逼近理想解排序法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)对关键指标进行排序,识别出引发人因差错事件的高重要度因素,进一步分析揭示了潜在的事故致因路径,并提出基于切断致因路径的风险预防建议;最后,通过某MRO企业民用航空产品制造产线的225例人因差错事件对方法进行验证。结果表明:此分析方法共识别出11对强相关致因组、2项高中心度致因因素及5项高原因度因素,总结出6条易导致人因差错的事故致因路径;可以证明人因差错事件并非孤立存在,管理层面因素、不安全行为前提条件与不安全行为之间存在显著因果关系。
文摘The molecular-dynamics (MD) simulation was carried out to investigate the structure of medium-range order (MRO) of a liquid Al 5Fe 2 alloy. Prepeak is observed in the structure factor S(Q), which is considered as the signature of MRO. Results from MD simulation and experiment agree well with each other, which proves reliability of the simulation. It is found from the calculated Ashcroft-Langreth structure factors that there exists strong interactional force between atom Al and Fe, which results in the great concentration fluctuation, i.e. the chemical order, in the liquid Al 5Fe 2. Both the chemical order parameter, α , and the Bhatis-Thornton(BT)structure factors indicate the preference for unlike-neighbor bonds. It is seen from the low-Q domain of S(Q) and the concentration-concentration structure factor S CC(Q) that the prepeak mainly comes from the first peak of S CC(Q). The structural model, which reflects the characteristic of MRO, is also constructed .
基金Project supported by the National Natural Science Foundation of China (Grant No 60572177)CAUC Foundation (Grant No 05yk27s)
文摘This paper derives the expressions for the ordering degree and the modulation factor of A and B atoms in AXB1-xC epilayers of ternary III-V semiconductor alloys. Using these expressions, it identifies quantitatively the alternating atom-enhanced planes, compositional modulations, atomic ordering degree on the group-III sublattices and the fine structure of NMR spectra.
