A capacity reservation game for suppliers with multiple blocks of capacity

This paper studies a supplier competition model in which a buyer reserves capacity from a number of suppliers that each have multiple blocks of capacity (e.g., production or power plants). The suppliers each submit a bid that specifies a reservation price and an execution price for every block, and the buyer determines what blocks to reserve. This game involves both external competition between suppliers and internal competition between blocks from each supplier. We characterize the properties of pure-strategy Nash equilibria for the game. Such equilibria may not always exist, and we provide the conditions under which they do.     

关于环境地质学的一些基本问题探讨

简要阐述了作者对有关环境地质学的一些基本问题的见解,包括;环境地质与地质环境的科学涵义;环境地质学与相关学科的关系;地质环境保护在整个环境保护中的应有地位;地质灾害的形成步骤及其防治途径;环境地质学的亟待完善领域等。同时也涉及整个环境科学的一些问题。     

基于局部线性变换的色阶映射算法

为了提高高动态图像显示的视觉效果,提出了一种基于局部线性变换的色阶映射算法。针对图像直接线性压缩能力较差的缺点,本文提出一种局部的线性变换模型。由于局部窗的结构,是利用局部窗的中心像素点与窗内的其他像素点的均值,方差的关系构造而成,因此基于局部线性变换的色阶映射算法能够抑制由具有高对比度的图像边缘所引起的鬼影和光晕现象。首先,根据线性变换将图像的色阶映射转换为求解泛函的最优解;其次,通过推导求解出线性变换的参数并将泛函最优化问题转换为求解一个线性方程组问题;最后求解线性方程组,得出视觉效果较好的低动态范围图像。有效避免传统色阶映射出现的光晕和亮度不连续的现象,能够更多的保留高动态图像的细节。最后通过实验结果对比分析,通过信息熵和对比度两个参数可以体现文中算法较好。     

IPAAm凝胶在丙酮水溶液中溶胀行为的关联与预报

基于Maurer和Prausnitz的凝胶相平衡条件，建立了凝胶的溶胀模型.模型假设凝胶是以凝胶组分及凝胶吸收的溶液为核心，以弹性半渗透膜为壳的复合体.并采用UNIQUAC方程计算凝胶相及与之共存液相的Gibbs过剩自由能，采用“phantomnetwork”理论计算凝胶的弹性自由能，采用“自由体积”计算分子的尺度效应.同时以N-异丙基丙烯酰胺（IPAAm）为单体合成了IPAAm凝胶.研究了25 ℃时IPAAm凝胶在丙酮水溶液中的溶胀行为，并测定了丙酮在胶体相和与之共存液相中的分配，以检验模型的关联与预报能力.结果表明,模型预报的单体总量和交联剂浓度对凝胶溶胀的影响与实验符合得很好.而且凝胶溶胀时，能很好地预测丙酮在两相中的分配,表明模型具有很好的关联和预报能力.     

音调/音量控制器芯片M61500FP及应用

介绍了内置QSurround系统的音响控制器IC、M61500FP的组成框图、引脚功能、控制信号与数据格式、功能特点及应用。     

An Online Buffer Management Algorithm for QoS‐Sensitive Multimedia Networks

In this letter, we propose a new online buffer management algorithm to simultaneously provide diverse multimedia traffic services and enhance network performance. Our online approach exhibits dynamic adaptability and responsiveness to the current traffic conditions in multimedia networks. This approach can provide high buffer utilization and thereby improve packet loss performance at the time of congestion.     

HTM技术中细微图形成形效果的衍射理论分析与实验结果

针对使用半色调掩膜技术的TFT LCD玻璃基板曝光过程中的衍射和干涉现象进行了分析.文中给出了衍射和干涉现象的理论模型,并且对这两种现象在HTM技术中所起的作用进行了解释,尤其针对不同的狭缝宽度和狭缝间距的结构进行了分析.给出了扫描电镜的图片做为进一步的说明.     

SDN‐based fault‐tolerant on‐demand and in‐advance bandwidth reservation in data center interconnects

Geographically distributed data centers are interconnected through provisioned dedicated WAN links, realized by circuit/wavelength–switching that support large‐scale data transfer between data centers. These dedicated WAN links are typically shared by multiple services through on‐demand and in‐advance resource reservations, resulting in varying bandwidth availability in future time periods. Such an inter‐data center network provides a dynamic and virtualized environment when augmented with cloud infrastructure supporting end‐host migration. In such an environment, dynamically provisioned network resources are recognized as extremely useful capabilities for many types of network services. However, the existing approaches to in‐advance reservation services provide limited reservation capabilities, eg, limited connections over links returned by the traceroute over traditional IP‐based networks. Moreover, most existing approaches do not address fault tolerance in the event of node or link failures and do not handle end‐host migrations; thus, they do not provide a reliability guarantee for in‐advance reservation frameworks. In this paper, we propose using multiple paths to increase bandwidth usage in the WAN links between data centers when a single path does not provide the requested bandwidth. Emulation‐based evaluations of the proposed path computation show a higher reservation acceptance rate compared to state‐of‐art reservation frameworks, and such computed paths can be configured with a limited number of static forwarding rules on switches. Our prototype provides the RESTful Web service interface for link‐fail and end‐host migration event management and reroutes paths for all the affected reservations.     

基于双边滤波的多尺度分层色调映射算法

为增强高动态范围图像(High dynamic range,HDR)的显示效果,本文提出一种多尺度梯度域色调映射算法。首先提取高动态范围图像的亮度信息,利用双边滤波将高动态范围图像的亮度数据进行多尺度分解,得到基本层和细节层。由于视觉上的亮度变化体现为图像数据的梯度变化,因此可在梯度域对基本层图像进行自适应动态范围压缩,然后加上细节层图像信息,最后再通过色彩校正算法恢复图像色彩,实现HDR图像的动态范围压缩。通过对比算法的定量分析表明,本文算法的方差和信息熵的客观指标分别提高了30.8%和5.9%,因此,本文方法在压缩HDR图像的动态范围的同时,可以更好地保留边界、纹理等细节信息。     

基于EVM约束的预留子载波峰均比抑制

传统预留子载波(Tone Reservation, TR)技术要求预留的子载波与数据子载波正交,占据的带宽受限,因而其降低峰值平均功率比(Peak-to-Average Power Ratio, PAPR)能力有限。提出了一种基于误差适量幅度(Error Vector Magnitude, EVM)约束的TR算法,将传统的预留子载波扩展至数据子载波生成峰值消除信号,从而大幅度降低峰值功率。基于系统误码率的考虑,在优化问题中加入数据子载波上会出现的最大EVM约束,采用凹凸过程(Concave-convex Procedure, CCCP)优化算法求解提出的优化问题。仿真结果表明,所提算法在发送端峰均比改善5.6 dB的同时,接收端解调性能仅损失1 dB。