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《中国工程机械学报》2015,(4)
研究了消费者的环保偏好对企业再制造率的影响,并分析了在供应链背景下供应链成员就再制造率的协调问题.提出了基于消费者环保偏好的再制造供应链模型.结果表明,消费者中环保主义者所占的比例越大,制造商最优的再制造率越高,而环保主义者对再制造产品的偏好越强,最优的再制造率也越高.在供应链背景下,制造商的最优再制造率低于整个供应链最优的再制造率.此时,零售商可以采取提供环保补贴的方式来协调供应链. 相似文献
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为研究直播经济下双渠道供应链网络的产品质量控制策略,运用超网络和变分不等式刻画了供应链内部成员的最优经济行为,并构建了双渠道供应链超网络模型。通过数值算例分析了消费者电子渠道偏好、渠道间需求竞争强度因子、政府惩罚概率等因素对产品质量控制策略的影响。结果表明:电子渠道对实体渠道的竞争强度越大,网络直销产品质量越高;实体渠道对电子渠道的竞争强度越大,网络直销产品质量越低。当消费者电子渠道偏好增加到一定程度时,增大消费者电子渠道偏好可以促使网络直销产品质量提高。此外,只有当消费者电子渠道偏好较大或电子渠道对实体渠道的竞争强度更大时,政府惩罚才能够发挥较好的效果。 相似文献
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为避免因产品与消费者偏好不符造成的退货风险而引起的消费者效用损失导致的市场需求下降,研究了存在退货风险的传统供应链和双渠道供应链中的定价和服务水平决策问题.在数值分析部分,对比分析不同环境下退货率对供应链决策的影响,进行了双渠道供应链参数对需求分配的敏感性分析,并对退货率与渠道需求分配同时变化时不同定价模式下的利润进行了比较研究.研究表明,在传统供应链下,退货率越高的产品,批发价越低,零售商的SA服务水平越高.而在双渠道供应链下,退货率对供应链的影响与定价模式、服务成本等密切相关.在两种定价模式中,制造商偏好于价格不一致模式,零售商偏好于渠道等价模式.但对于退货率较高的产品,价格不一致模式更容易成为双渠道供应链各方的一致选择. 相似文献
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《计算机集成制造系统》2014,(4)
为了使产品设计师能够通过材质设计增加产品差异性,提高消费者的满意度,提出一种基于基因表达式编程的材料质感偏好意象进化认知算法。综合考虑产品材质的视觉、触觉物理量与视觉心理量对产品偏好的影响,对124个地板样本的材色、光泽度和粗糙度物理量进行了测量。60名受试者对地板样本分别进行了纹理和偏好心理量的主观评分,采用主观量表获取实验数据。经过无量纲化处理和主成分分析后,归纳出四个主成分为自变量、偏好意象为因变量,将解析材料质感要素与消费者偏好意象之间的认知关系转化为复杂函数关系建模问题。结果表明,在求解产品材料质感偏好意象认知关系的问题上,该算法比神经网络和支持向量机算法具有更好的预测效果和更强的鲁棒性。基于该偏好进化认知算法开发了地板喜好度测评系统,并在实际应用中验证了算法的有效性。 相似文献
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精准获取用户客观需求是智能个性定制亟待解决的问题之一,传统方法明确用户认知偏好时存在多属性用户群体需求错位、对设计师经验依赖性强的问题,对此提出脑视觉认知机制下意象-产品归类的集群用户偏好推理方法。运用统计学方法甄选样本域及意象域,降低了人工干预;基于K-modes聚类用户认知特征元,构建了相似用户集群;采用K近邻算法智能化识别被试所属集群,并开展眼脑融合的主客观集成化认知实验,提取了集群中的关键主客观认知指标;最后运用逼近理想点排序法归类集群用户对应的意象-产品群,基于此归类推理出了新相似用户的认知偏好。以无人机用户认知偏好推理为例,建立了脑视觉认知机制下集群用户的意象-无人机归类,快捷推理新用户的需求案例及认知偏好,结果表明,运用现有集群用户的生理认知数据明确新用户的客观偏好的可行性和有效性,可提升生理实验的再利用率,为群体智能定制模式的个性设计提供理性客观视角。 相似文献
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针对应力比对疲劳裂纹扩展及门槛值的影响,依据裂纹闭合与裂纹扩展驱动力机制的统一思想,阐述了Zhu-Xuan模型与Kwofie-Zhu模型的建立过程,并基于25Cr2Ni2MoV转子钢焊接接头的疲劳裂纹扩展试验数据对模型进行验证。结果表明,两种模型在近门槛值区和Paris区均有良好的预测效果,其中Zhu-Xuan模型形式简单,对CrMoV钢具有普适性,预测门槛值的误差在10%以内,而Kwofie-Zhu模型预测结果更准确,但应用过程涉及参数求解,过程较复杂。研究认为,裂纹闭合与扩展驱动力机制的统一模型描述疲劳裂纹扩展行为的应力比相关性是合理可行的,且具有较好精度。 相似文献
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基于新裂纹扩展驱动力参量的焊接接头疲劳裂纹扩展的研究 总被引:1,自引:1,他引:0
传统上疲劳裂纹扩展速率以一个参量——应力强度因子幅(PARIS模型)或有效应力强度因子幅(ELBER模型)来表达。PARIS模型不能统计应力比效应和变幅加载历史。ELBER裂纹闭合模型虽被广泛应用,但确定其开闭口载荷的测量方法很多,且测量结果均存在主观性。最近研究表明,疲劳裂纹扩展不仅依赖于应力强度因子幅,还与最大应力强度因子有关。并且KUJAWSKI提出了两参量模型,该模型避开了有争议的裂纹闭合效应。基于一个载荷循环中柔度变化与裂纹尖端开闭口与弹塑性行为的关系,提出一个新的具有物理意义的两参量驱动力模型。针对Q345钢焊接接头各区域进行两种应力比R=0.1和0.5的疲劳裂纹扩展试验。使用该模型针对Q345钢焊接接头各区域的疲劳裂纹扩展数据进行验证。结果表明,提出的新模型在预测应力比对裂纹扩展速率的影响时比上述三个模型更有效。 相似文献
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针对智能工业色谱仪的谱峰数据处理问题,提出谱峰识别参数类型的确定方案,介绍了在嵌入式系统中实现识别参数自整定的方法。该研究已用于国产工业色谱仪,提高仪器的智能化功能,方便仪器的现场应用,并在工业流程的使用中取得较好效果。 相似文献
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A. P. Krasnov O. V. Afronicheva V. A. Mit’ V. B. Bazhenova T. V. Volkova O. V. Sinitsyna Ya. S. Vygodskii I. A. Rashkovan M. E. Kazakov 《Journal of Friction and Wear》2009,30(5):350-355
The effect of nanofillers (multiwalled carbon nanotubes) on the tribological behavior of polycaproamide is studied when introduced
into the polymer by polymerization filling. The introduction of insignificant quantities (∼0.1 wt %) of nanotubes provides
their homogeneous distribution in the polymer and contributes to reducing the wear and friction coefficient. This is mainly
due to the role of nanotubes as nucleators of the fine spherulitic polycaproamide structure. Such an indirect effect of the
nanofiller on the polymer’s tribological behavior is seen when nanotubes are added to the melt in the course of granulation
of polycaproamide compositions reinforced by carbon fibers, the effect of nanotubes being reduced with increasing amount of
the reinforcing filler. 相似文献
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模糊产生式规则的置信度的获得大多依赖专家的经验,使得基于模糊产生式规则的模糊Petri网参数难以获得.将微粒群算法引入到模糊Petri网的置信度寻优过程,提出一种基于改进的微粒群算法的参数优化策略,该算法对初始输入无严格要求,求解速度快、精度较高,提高了模糊Petri网的泛化能力,降低了对专家经验的依赖程度. 相似文献
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Daniel Sauceda Nicolás Velázquez Octavio García-Valladares Ricardo Beltrán 《Journal of Mechanical Science and Technology》2011,25(6):1399-1408
In this work, a solar parabolic trough collector (PTC) has been dimensioned and its technical feasibility has been evaluated
in order to be used as ammonia direct vapor generator in an advanced absorption air-cooled Solar-GAX cycle of 10.6 kW cooling
capacity. A detailed numerical simulation model that takes into account the geometry and the optical, thermal and fluid dynamic
behavior of the PTC has been developed. The model has been solved in order to reach minimal thermal losses through the PTC,
and maximum coefficient of performance (COP) of the Solar-GAX cycle. Under design conditions, the solar PTC efficiency, the
COP of the Solar-GAX cycle and the global efficiency of the system were 0.62, 0.87 y and 0.54 respectively. The calculated
efficiency is 25.5 % higher than that provided by a single effect water-lithium bromide cycle coupled in an indirect form
with a solar PTC system. 相似文献
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Since a 1974 report of nonoperative closure of atrial septal defects (ASDs) using an umbrella catheter device, an additional 25 dogs have undergone creation of atrial septal defects, 12 of which have subsequently had successful transvenous closure. An improved model of the closure device has been developed, still using a pair of interlocking umbrella-like components made of stainless steel and Dacron. The umbrellas are smaller, lighter, and have an automatic opening ring. They are loaded simultaneously into a single capsule on the distal end of the outer catheter and are passed into the heart on a single passage, thus eliminating several steps of the original technique. Closure time has diminished from an average of 30 minutes to 5-10 minutes. The completeness of closure was documented in 12 animals by repeat cardiac catheterization which included hydrogen electrode studies. Autopsies on 10 sacrificed dogs revealed no adverse effects or migration of the device; two dogs are living and healthy. In the one clinical application, the patient has done well, remaining afebrile with an increased activity tolerance and resumption of normal activities. The umbrella has remained in position and appears to be functioning well. 相似文献
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Konjengbam Darunkumar Singh Yigeng Xu Ian Sinclair 《Journal of Mechanical Science and Technology》2011,25(12):3025-3036
The results from ‘strip yield’ approach of the FASTRAN type models of plasticity induced crack closure effects of fatigue
cracks subjected to variable amplitude loadings are presented. The strip yield results are compared with authors’ finite element
(FE) and experimental results. It has been observed that the strip yield model is seen to be fundamentally limited by choice
of α (constraint factor) and corresponding to treat baseline closure effects. Double overload closure behavior is functionally
similar for both strip yield and FE models. Under multiple overloads, an important functional difference is seen between FE
and strip yield models. This has been linked to the absence of in-plane constraint in the strip yield model, which is seen
to have a distinct decreasing influence on on-going closure effects. 相似文献