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ABSTRACTIn idealized secret image sharing (SIS), all of the shared images (shadows) play the same role, but in real life, the shared images are often hierarchical. This paper proposes a hierarchical secret image sharing (HSIS) method by means of optical imaging. To implement the scheme, a generalized single-phase modulation algorithm is proposed in Fresnel transform domain. Its features that multiple secret images can be recovered through combination of some shared images though each participant only holds one share of images. Theoretically, the secret images are divided into multiple phase encodings (shared images) by phase modulation, each secret image can be directly captured by the intensity detector when illuminating some of the shared images orderly displayed with parallel light. Experimental simulation shows that the shared images and the restored secret images do not have any size distortion, and further verifies the feasibility of the proposed scheme. 相似文献
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考虑成员企业公平偏好行为,并引入核心企业对成员企业的监督函数,构建双代理人情形下的供应链知识共享激励与监督模型,剖析成员企业公平偏好对供应链知识共享激励与监督效果的影响。研究结果表明:激励与监督机制对知识共享努力水平的提升具有互补性;随着核心企业监督水平的提升,产出激励系数减少,奖惩系数增加;成员企业公平偏好对供应链知识共享激励系数和供应链知识共享奖惩系数并不总是起到积极作用,但可以提升知识共享努力水平。 相似文献
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针对传统GrabCut算法需要用户交互缺点,提出一种基于上下文感知显著性的GrabCut的改进的图像分割算法.首先用上下文感知得到待分割图像的显著图,然后由二值化的显著图确定GrabCut算法的初始化区域,再通过迭代使能量函数最小化分割出目标,算法应用于骨髓细胞图像分割上.实验结果表明,此算法能避免以往细胞分割算法如支持向量机、K-Means等参数调整问题,总体误差率较低,自动化程度高,鲁棒性强. 相似文献
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People exhibit peer-regarding fairness concern when others who are in similar circumstances are treated unfairly. The fairness concern derives from a sense of sympathy or schadenfreude. We study it in a distribution channel where a supplier deals with two retailers located at independent markets. Sympathy means the decrease of the retailer’s utility because he believes that his peer’s unfair treatment is undeserved, while schadenfreude indicates the utility increase as the unfair treatment is perceived deserved. The two retailers are offered wholesale prices sequentially and set their retail prices if they accept the offers. In our paper, the second retailer has the peer-regarding fairness concern. We show the following in regards to this idea: (i) the retailers’ profits and the distribution channel performance can be improved by the peer-regarding fairness concern for sympathy; (ii) the retailers’ profits and the channel performance can be reduced by the peer-regarding fairness concern for schadenfreude; and (iii) the peer-regarding fairness concern for sympathy is unfavourable to the supplier, and the second retailer may be punished separately if the concern is not strong enough, while the supplier benefits from the peer-regarding fairness concern for schadenfreude and may exploit the second retailer solely if the schadenfreude parameter is large. 相似文献
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Bin Zhang Muhammad Waqas Shanshan Tu Syed Mudassir Hussain Sadaqat Ur Rehman 《计算机、材料和连续体(英文)》2021,68(2):2179-2188
Secret key generation (SKG) is an emerging technology to secure wireless communication from attackers. Therefore, the SKG at the physical layer is an alternate solution over traditional cryptographic methods due to wireless channels’ uncertainty. However, the physical layer secret key generation (PHY-SKG) depends on two fundamental parameters, i.e., coherence time and power allocation. The coherence time for PHY-SKG is not applicable to secure wireless channels. This is because coherence time is for a certain period of time. Thus, legitimate users generate the secret keys (SKs) with a shorter key length in size. Hence, an attacker can quickly get information about the SKs. Consequently, the attacker can easily get valuable information from authentic users. Therefore, we considered the scheme of power allocation to enhance the secret key generation rate (SKGR) between legitimate users. Hence, we propose an alternative method, i.e., a power allocation, to improve the SKGR. Our results show 72% higher SKGR in bits/sec by increasing power transmission. In addition, the power transmission is based on two important parameters, i.e., epsilon and power loss factor, as given in power transmission equations. We found out that a higher value of epsilon impacts power transmission and subsequently impacts the SKGR. The SKGR is approximately 40.7% greater at 250 from 50 mW at epsilon = 1. The value of SKGR is reduced to 18.5% at 250 mW when epsilonis 0.5. Furthermore, the transmission power is also measured against the different power loss factor values, i.e., 3.5, 3, and 2.5, respectively, at epsilon = 0.5. Hence, it is concluded that the value of epsilon and power loss factor impacts power transmission and, consequently, impacts the SKGR. 相似文献
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在克服著名电子发票服务IBS协议缺陷的基础上,提出了一个新的电子发票服务协议。同时,采用新的基于扩展Kailar逻辑的分析方法对新协议进行了公平性形式化分析与修改,最终得到一个可以工作在不可靠信道上的公平电子发票服务协议。 相似文献
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分析了医院管理中知识共享的障碍,从文化、组织、激励机制、制度和技术等层面对知识共享的实现进行研究,建立了知识共享机制的理论模型,为提高医院知识管理的能力和知识共享的效率提供了有效的途径. 相似文献
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探究货代公司构建并应用航运物流区块链平台时,除了关注自身利润,还会关注物流链上利润分配的公平性问题。以船公司−航运物流区块链平台 (货代公司) 组成的二级供应链为研究对象,构建3种决策情形下的Stackelberg博弈模型,分析航运物流区块链平台具有公平关切特征时对航运物流供应链决策的影响,进而提出收益共享和区块链成本共担的契约协调,并用数值算例验证其有效性。研究发现:1) 航运物流区块链平台的公平关切行为能够提高其在整个航运供应链的利润占比,缩小与船公司的利润差距;2) 与公平中性相比,公平关切下的船公司制定的海运运费降低,与公平关切系数呈负相关;3) 收益共享和区块链成本共担的契约协调比例在一定范围内能使航运物流区块链平台和船公司实现共赢,且公平关切下契约协调比例相比公平中性更严格。
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研究了众核处理器的访存公平性问题。针对众核处理器距离访存资源较近的处理单元拥有较大的访存带宽而造成的访存公平性问题,提出了一种面向大数据应用的众核处理器访存公平性调度机制:最少最远(LFF)优先访存。这种机制的原理如下:依据处理单元距离访存资源的距离以及处理单元访存的次数来调度访存顺序,以保证各个处理单元的公平性。首先,访问次数较少的节点被赋予更高的访存优先权。其次,在具有相同访问次数的节点中,距离更远的节点优先访存。再次,在相同距离的节点中,已被选中优先次数少的有优先级。实验评估表明,该调度机制能够有效解决众核处理器的访存公平性问题,其公平性调度效果优于FR-FCFS,PAR-BS、ATLAS。在1024核情况下,系统异步率由FR-FCFS的15.5%降低到1.89%。 相似文献
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PurposeUsers on Social Media (SM) platforms make many decisions related to content sharing, such as whether to create or reuse content, whether to label for easy access by an interest group or not, and whether to disseminate to targeted individuals or broadcast to general audiences. In this study, we investigated if these content-related strategies on SM, called social media knowledge sharing behaviors, are determined by user characteristics.MethodologyUsing concepts from Self-Motivation Theory and the Affordance Theory, we examined if the knowledge sharing behaviors are influenced or correlated with user characteristics, such as the intensity of engagement on SM, a strong preference attitude for a SM platform, and multiple functional intentions for using SM. Based on this survey study of one hundred and twenty-three subjects, we developed hierarchical regression analyses to test if the SM user's knowledge decisions (Creation, Framing and Targeting) are corelated with the user's online usage intensity, their SM online platform preferences, and their functional intentions (Intensity, Preferences and Functionality). We complemented the regression models with a more comprehensive path analysis for an integrative hypothesis testing.FindingsThe main findings show that knowledge creation and knowledge targeting behaviors were correlated with multiple functional intentions (or needs) of users, meaning that users who utilized SM in order to fulfill many needs create and broadcast knowledge more than users that utilized SM in order to fulfill fewer needs.OriginalityThe study investigates the relationship between detailed knowledge sharing behaviors afforded by the social media tools and different user self-determination factors, such as intensity, preference and needs. This study further describes the attributes of social media sharing as a bundle of content sharing strategies of creation, sharing and targeting, which are used differently based on different user characteristics and motivations. 相似文献
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目的 随着邮寄快递行业的发展,快递包装造成环境污染和资源浪费,根据可循环发展的理念,共享包装设计模式成为互联网平台下可持续发展的有效路径。方法 采用文献研究、理论阐述,结合设计学相关知识分析,“共享包装”的共享模式是以包装资源共享实现可持续发展的理念。在“互联网+”的模式下,如何推动用户参与绿色消费、如何实现共享包装共用及共享包装管理系统有效运作等问题,仍然是共享包装实现共享模式所面临的困境。结论 共享包装设计模式是在互联网平台下,推动包装资源共享,实现包装箱体共用,符合生态环境美学及共享经济特征,促进经济和生态的多重利益。共享包装可持续实现的路径是提倡绿色包装消费行为、包装共享结构及可持续发展共享包装运行模式,对数据共享平台下共享包装的理论研究和实践发展都有一定的参考价值。 相似文献
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The outbreak of COVID-19 has significantly affected the development of enterprises. In the post-pandemic era, blockchain technology has become one of the important technologies to help enterprises quickly gain market competitiveness. The heavy investment required of supply chain stakeholders to employ blockchain technology has hindered its adoption and application. To tackle this issue, this study aims to facilitate the adoption of blockchain technology in a supply chain consisting of a core enterprise and a small/medium-sized enterprise through an effective supply chain contract. We analyze the performance of a cost-sharing (CS) contract and a revenue-sharing (RS) contract and propose a new hybrid CS-RS contract for better performance. We conduct comparative analyses of the three contracts and find that the hybrid CS-RS contract can more effectively incentivize both parties to reach the highest level of blockchain technology adoption and achieve supply chain coordination. 相似文献
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为研究供应商与存在行为偏好的制造商组成的二级供应链中质量升级努力投入与定价问题,根据均值−方差法和FS公平理论构建模型,采用Stackelberg博弈的方法,分析最终产品质量水平、零件质量水平、零件质量升级水平及制造商的行为偏好对供应链双方决策和效用的影响,并通过数值仿真验证。研究发现,供应链双方效用、零件售价、零件质量升级努力及订货批量与零件质量升级水平成正相关的同时,受其影响与最终产品质量水平呈不同变化趋势;零件售价受市场环境影响与零件质量水平呈不同变化趋势,供应链双方效用、零件质量升级努力及订货批量与零件质量水平负相关;订货批量、零件质量升级努力、零件售价与制造商的风险规避程度正相关,与制造商的公平偏好程度负相关。
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为研究供应商与存在行为偏好的制造商组成的二级供应链中质量升级努力投入与定价问题,根据均值−方差法和FS公平理论构建模型,采用Stackelberg博弈的方法,分析最终产品质量水平、零件质量水平、零件质量升级水平及制造商的行为偏好对供应链双方决策和效用的影响,并通过数值仿真验证。研究发现,供应链双方效用、零件售价、零件质量升级努力及订货批量与零件质量升级水平成正相关的同时,受其影响与最终产品质量水平呈不同变化趋势;零件售价受市场环境影响与零件质量水平呈不同变化趋势,供应链双方效用、零件质量升级努力及订货批量与零件质量水平负相关;订货批量、零件质量升级努力、零件售价与制造商的风险规避程度正相关,与制造商的公平偏好程度负相关。 相似文献