双边滤波与暗通道结合的图像保边去雾算法

目的 图像去雾领域越来重视去雾过程中对图像边缘细节的恢复和保护,针对现有主流的基于模型的有雾图像复原算法,基本都是对介质透射率进行直接求解,即先预估透射率,再细化抠图,运算量很大的问题,提出利用双边滤波方式进行介质透射率的间接求解,用以简化去雾算法时间复杂度。方法 利用双边滤波方式对介质透射率的求解,是先估算出较精确的大气散射函数及大气光值,然后间接求出透射率,其避免了采用软件抠图的方式对介质透射率进行细化的过程,提高了算法的时效性。结果 选取两组户外有雾图像进行实验,并从得出的透射率图、复原效果及运算时间进行了对比分析。本文算法能得到较为清晰的透射率分布图,并且改善了预估透射率图中的块状现象;本文算法对透射率细化的同时,还起到了平滑图像边缘的效果;耗时方面,本文算法对大小为608×456像素的图像恢复耗时为1.803 s。结论 本文算法对有雾图像进行全局清晰化处理的同时,重点恢复有雾图像的局部细节,复原结果能更好地保持图像边缘的效果,更适合运用到基于图像检测类的系统中去。     

Supply chain coordination with risk sensitive retailer under target sales rebate

Target sales rebate (TSR) contracts have been shown to be useful in coordinating supply chains with risk-neutral agents. However, there have been few studies on the cases with risk sensitive agents. As a result, based on the classic Markowitz portfolio theory in finance, we carry out in this paper a mean–variance (MV) analysis of supply chains under TSR contracts. We study a supply chain with a single supplier and a single risk averse retailer. We propose TSR contracts for achieving coordination. We demonstrate how TSR contracts can coordinate the supply chain which takes into consideration the degree of risk aversion of the retailer. We find that the supplier can coordinate the channel with flexible TSR contracts. In addition, we extend the supply chain model to include sales effort decision of the retailer. Conditions for TSR contracts to coordinate the supply chain with sales effort of retailer are also derived.     

Formal Analysis of Multiparty Contract Signing

We analyze the multiparty contract-signing protocols of Garay and MacKenzie (GM) and of Baum and Waidner (BW). We use a finite-state tool, Mocha, which allows specification of protocol properties in a branching-time temporal logic with game semantics. While our analysis does not reveal any errors in the BW protocol, in the GM protocol we discover serious problems with fairness for four signers and an oversight regarding abuse-freeness for three signers. We propose a complete revision of the GM subprotocols in order to restore fairness.     

A reference architecture for telecommunications operations applications

The emerging multi-layer functional model for network operations decomposes management functions into several layers:Service Management Layer, Network Management Layer, Element Management Layer, andElement Layer. To realize the full benefits of this functional distribution, a reference architecture for operations applications is needed. This architecture should enable flexible placement of functions in computing systems or nodes, enable hiding of the complexities of distribution from applications, and prescribe principles for the specification of application interfaces to facilitate application interoperability. This paper describes such a framework architecture. In this framework, applications are deployed in software units calledbuilding blocks, each of which is independently installed and administered. Building blocks interact via interfaces calledcontracts. A contract is an open interface that is specified according to some principles, such as adherence to standard communication paradigms, separation of engineering aspects from functional aspects, and support for previous interface versions. The infrastructure, called theDistributed Processing Environment (DPE), provides communication and security services that enable building blocks to interact via contracts. The DPE provides access and location transparency to applications. The paper presents details of this architecture framework and an example to illustrate specification of contracts for network management functions.     

浅谈水利工程代建制模式下的合同管理

代建制作为一种新型的建设管理模式,其合同管理对于整个工程的建设管理具有重要的意义。本文从建设单位和代建单位双方权利义务关系、规范化的规章制度、动态的合同管理和变更管理、及时正确处理各项索赔等几个方面对水利工程代建制模式下的合同管理作了全面探讨。     

An iterative algorithm based on the piecewise linear system for solving bilateral obstacle problems

In this paper, we derive the piecewise linear system (PLS) associated with the bilateral obstacle problem and illustrate the equivalence between the linear system and finite-dimensional complementary problem. The existence and the uniqueness of the solution to the PLS are also demonstrated. Based on the PLS, a Picard iterative algorithm is proposed. The convergence analysis is given and examples are presented to verify the effectiveness of the method.     

A Low‐Memory,Straightforward and Fast Bilateral Filter Through Subsampling in Spatial Domain

In this work we present a new algorithm for accelerating the colour bilateral filter based on a subsampling strategy working in the spatial domain. The base idea is to use a suitable subset of samples of the entire kernel in order to obtain a good estimation of the exact filter values. The main advantages of the proposed approach are that it has an excellent trade‐off between visual quality and speed‐up, a very low memory overhead is required and it is straightforward to implement on the GPU allowing real‐time filtering. We show different applications of the proposed filter, in particular efficient cross‐bilateral filtering, real‐time edge‐aware image editing and fast video denoising. We compare our method against the state of the art in terms of image quality, time performance and memory usage.     

努力因素影响下的RS-MM契约协调模型研究

供应链成员的努力行为是影响市场需求的重要因素之一．作者研究了当市场需求受到努力因素影响下的由制造商、分销商和零售商组成的三级供应链协调的问题,首先在集中决策模式下得出了使得供应链协调时的最优产品订购数量和最优努力水平应满足的条件;然后针对三级供应链中的两个不同的交易过程,设计了一种RS-MM联合契约机制来协调供应链,即对制造商与分销商、分销商与零售商分别采取收益共享契约机制和价格补贴契约机制来协调供应链．为了鼓励零售商使得自身的最优努力水平达到供应链协调时的系统最优努力水平,在价格补贴契约中又引入了数量折扣契约．文章证明了只要制定合理的契约参数,Rs-MM联合契约能够使得供应链协调,实现供应链成员的三赢,最后用算例验证了这种联合契约的有效性．     

瀑布沟大坝施工临建系统变更与合同费用管理

砾石土筛分、运输系统及砂石骨料加工系统是瀑布沟水电站大坝工程重要的施工临建系统。介绍了该工程施工临建系统在招投标阶段确定的招标方案及投标报价。由于特殊原因,在施工阶段发生了实施方案技术变更,从而导致合同费用大幅度调整。为了避免这种较大的调整给工程建设带来影响,提出了加强招投标文件中有关临建设施部分的审查、合理确定调整方案、切实做好变更费用审核工作等措施,以保证工程顺利实施。     

销售努力成本分担情况下供应链回购契约研究

考虑由一个供应商和一个零售商构成的二级供应链,需求是随机的且受销售努力水平的影响。本文首先分析了回购契约无法协调的原因;然后在销售努力成本分担的情况下,提出了分别通过限定回购系数和分担努力成本系数使供应链得以协调。