考虑居民选择行为的过期药品逆向物流网络设计

过期药品逆向物流网络设计成为医药安全领域迫切需要解决的关键问题.本文考虑居民的选择行为,引入回收企业对居民区以及政府对回收企业的补贴激励,构建了基于双层规划的过期药品逆向物流网络优化模型,并设计了求解该模型的分层遗传算法,通过算例得到了不同方案下过期药品逆向物流由分散到集中的网络结构.此外,考虑两种激励策略及模型参数的影响,设计四个实验进行分析讨论,研究表明：同时加大对医药企业及居民区的补贴策略更有利于调动企业及居民参与回收过期药品的积极性;企业成本与居民区成本存在此消彼长的相互作用关系;单位药品运输成本对居民区成本有较大影响,而居民区拥有过期药品的数量对企业和居民区成本均有明显影响.     

高动态范围图像及反色调映射算子

近年来,高动态范围（high dynamic range, HDR）图像在学术研究和各种应用领域都受到广泛的关注,成为图像处理领域的一个研究热点。首先,对HDR图像的捕获方法以及编码格式进行归纳介绍。然后,对目前已有的从低动态范围图像获取HDR图像的算子,即反色调映射算子,进行分类归纳,并对每种算子进行详细论述,比较它们的关键特性,分析它们的优缺点,为反色调映射算子的具体应用和理论研究打下基础。     

An Improved Algorithm for k-Nearest-Neighbor Finding and Surface Normals Estimation

This paper is to improve the speed of k-nearest-neighbor search and put forward algorithms related to tangent plane estimation based on existing methods. Starting from the points cloud, the algorithm segments the whole data into many different small cubes in space, and the size of cube is related to the density of the points cloud. Considering the position of the point in the cube, the algorithm enlarges the area around the given point step by step until the k-nearest-neighbor is accomplished. The neighbor’s least-squares tangent plane is estimated. In order to orient the planes, the k-nearest-neighbor is introduced into the problem of seeking the minimum spanning trees instead of searching the whole data. The research proved that the algorithms put forward in this paper were effective in processing data in short time and with high precision. The theory was useful for the practical application in reverse engineering and other areas related. Solution for finding k-nearest-neighbor problem, which still costs much time in present, was provided, and a propagation algorithm for orienting the planes was also discussed. The algorithm chose the orientation among the k-nearest-neighbor of the current point.     

有赎回权的住房反向抵押贷款定价模型的定量研究

针对有赎回权、有期限的住房逆抵押贷款产品,作了较具体的定量测算,并与相同情况下无赎回权、有期限的住房反向抵押贷款产品的定量精算结果进行比较．结果显示在申请人和支付方式均相同的情况下．有赎回权产品所得的支付额均低于无赎回权产品。其差额即为期权费．     

利用反向PCR鉴定沼泽红假单胞菌中野生质粒

为准确研究沼泽红假单胞菌的野生质粒及其携带的基因信息,在常规碱裂解法基础上,对沼泽红假单胞菌Rhodopseudomonas palustris AS1.2352中野生质粒提取方法进行了优化,优化方法具有易操作、耗时少、纯度高等特点,所得质粒DNA纯度和质量均满足进一步分子操作的需要.同时,利用反向PCR技术鉴定该野生质粒,并结合生物信息学方法对其进行分析,比传统的质粒丢失法验证和考察质粒更为省时、可靠和直观.证明菌株携带4个野生质粒,其中2.3 kb的质粒序列与Escherichia coli pEC157 Rom-like protein gene有97.8%的同源性,推测1885~1887碱基为复制起点.     

Multi-objective Optimization of Controller for Process with Reverse Response and Dead Time

Due to the difficulty of controlling the process with inverse response and dead time,a Multi-objective Optimization based on Genetic Algorithm (MOGA) method for tuning of proportional-integral-derivative (PID) controller is proposed. The settings of the controller are valued by two criteria,the error between output and reference signals and control moves. An appropriate set of Pareto optimal setting of the PID controller is founded by analyzing the results of Pareto optimal surfaces for balancing the two cr...     

空气静压轴承主轴回转精度的检测

研制空气静压轴承主轴回转精度检测系统,提出正弦回归法分离测量球的安装偏心,采用“反向法”剔除测量球的形状误差,并引用实验予以验证。     

Colluvial wedges associated with pre-historical reverse faulting paleoearthquakes

Colluvial wedges collapsed from fault scarp can also be used to study reverse faulting paleoearthquakes. Generating processes of reverse faulting colluvial wedges are much more complex than those associated with normal faulting earthquakes. Reverse faulting colluvial wedge is also in triangle shape, and dies away from the fault. Contact between the fault and the colluvial wedge may be a simple straight reverse fault or a combination of an erosive surface in the upper part and a reverse fault in the lower part. Contents and grain sizes increase near the fault and along the base of a colluvial wedge. Based on examples from the piedmont reverse fault and fold along the northern Tainshan, we studied characteristics of reverse faulting colluvial wedges, and discussed the generating processes of reverse faulting colluvial wedges. Reverse faulting generates an unstable scarp hanging in the air immediately after an earthquake. Fallen material deposits along the base of newly formed fault scarp. Erosive surface and surface of colluvial wedge form an antithetic scarp with an opposite direction to underlain reverse fault. If the later stage colluvium covers both the early stage colluvium and the erosive surface, the colluvial wedge will have a curved vertical edge with reverse fault in the lower part and erosive surface in the upper part. If the erosive surface is not covered by later stage colluvium, the colluvial wedge will only have a simple straight vertical edge, which is the reverse fault. A colluvial wedge represents a paleoearthquake event, but the height of the wedge is not equal to vertical offset of the paleoearthquake.     

高压气井压井井筒温度场预测与影响因素分析

从反循环压井工艺特点出发,以质量守恒、动量守恒和能量守恒为理论基础,推导出反循环压井过程井筒温度场计算模型,并对压井液入口温度、压井液密度、循环时间、压井液排量、压井液导热系数、井深等对反循环压井过程中井筒温度场的影响进行分析.结果表明:随井深增加、压井液入口温度提高、压井液排量减小、循环时间缩短、压井液导热系数增大、压井液密度减小,井筒温度线向高温偏移,反之井筒温度线向低温偏移;调整压井液排量和压井液入口温度是改善井筒温度场最有效的途径.     

人体中耳有限元法数值仿真

精确的中耳有限元模型将有助于分析中耳的力学机理、辅助设计中耳助听装置.利用CT扫描和逆向成型技术建成了较精确的中耳三维有限元模型,该模型基于一无任何听力损伤病史的成年志愿者的右耳.模型包括鼓膜、锤骨、砧骨、镫骨、砧锤关节、砧镫关节及中耳韧带/肌肉.最后,通过鼓膜及镫骨底板的位移仿真结果与国外实验测得数据进行对比,验证了该模型的可靠性.