综合资源规划及其研究热点问题

本文简要回顾了电力系统规划的发展历程及综合资源规划的产生背景，总结了考虑需求侧管理的综合资源规划区别于传统规划的特点，详细分析了有关需求预测、需求侧分析、供应侧分析和供需方综合规划的研究热点。基于对现有的综合资源规划模型与方法的评价，提出了关于今后研究方向的几点建议。     

DSM体系结构对并行编译系统的支持与挑战

分布存储系统因其可伸缩性好而得到很好的应用,不同的分布存储系统应运而生。而用户为了编程的简单方便,往往要求底层体系结构是透明的,即要求整个系统有统一的全局地址空间,因而促使了分布共享存储(DSM)系统的出现。根据硬件支持程度的不同,不同DSM系统对并行编译系统的支持和要求也不同。根据过去的工作经验,通过对比和分析硬件支持全局编址和软件支持全局编址的两种DSM系统的特点,该文指出分布共享存储系统对并行编译器的研制所提出的挑战,为以后并行编译系统的设计和实现及用户编程方式的选择有一定的促进作用。     

阶梯电价·电力需求侧管理·社会公平——基于对我国阶梯电价模式的若干思考

在能源和环境问题日益突出的今天,居民用电的定价既要保证居民的基本生活需要,同时也要考虑到能源节约和环境保护。阶梯电价作为一种新型的居民用电定价方式,既是推进我国电力需求侧管理的一种有效手段,也是一项增进社会公平的重要举措,但同时也不可避免的存在一些问题。本文从电力需求侧管理和社会公平的角度出发,系统分析阶梯电价的重要意义和存在的问题,以促进阶梯电价体制的逐步完善。     

Semi-automatic classification of tree species in different forest ecosystems by spectral and geometric variables derived from Airborne Digital Sensor (ADS40) and RC30 data

This study presents an approach for semi-automated classification of tree species in different types of forests using first and second generation ADS40 and RC30 images from two study areas located in the Swiss Alps. In a first step, high-resolution canopy height models (CHMs) were generated from the ADS40 stereo-images. In a second step, multi-resolution image segmentation was applied. Based on image segments seven different tree species for study area 1 and four for study area 2 were classified by multinomial regression models using the geometric and spectral variables derived from the ADS40 and RC30 images. To deal with the large number of explanatory variables and to find redundant variables, model diagnostics and step-wise variable selection were evaluated. Classifications were ten-fold cross-validated for 517 trees that had been visited in field surveys and detected in the ADS40 images. The overall accuracies vary between 0.76 and 0.83 and Cohen's kappa values were between 0.70 and 0.73. Lower accuracies (kappa < 0.5) were obtained for small samples of species such as non-dominant tree species or less vital trees with similar spectral properties. The usage of NIR bands as explanatory variables from RC30 or from the second generation of ADS40 was found to substantially improve the classification results of the dominant tree species. The present study shows the potential and limits of classifying the most frequent tree species in different types of forests, and discusses possible applications in the Swiss National Forest Inventory.     

Distributed Texture Memory in a Multi-GPU Environment

In this work, we demonstrate a system that allows texture memory on multiple graphics processing unit (GPUs) to be virtualized in a manner that is both scalable and transparent to the programmer. Our system is built using a directory‐based shared‐memory abstraction to allow texture memory to be distributed while staying consistent. We use texture pages as our basic memory block and discuss the data structures, threading model, and consistency mechanisms necessary to implement a paging system in a multi‐GPU environment. The system is demand‐driven, and pages will only be loaded into the texture memory of a GPU that makes a request. The main contribution of this work is the identification of the mechanisms required to implement our abstraction, as well as the discussion of its limitations in order to make it more efficient.     

基于Delta-Sigma调制技术的锁相频率合成器的设计与实现

针对无人机遥测接收机本地振荡器多频点、低相噪的指标要求,分析了整数分频、传统小数分频等锁相频率合成器原理和存在的问题,介绍了多级delta-sigma调制器合成技术的原理及其在小数分频的锁相频率合成器中的应用,给出了其数学模型和杂散功率谱密度的表达式;完成了基于delta-sigma调制的锁相频率合成器的设计与实现,通过验证实验并与文献[1]比较表明,文中设计的频率合成器具有输出的信号低相噪、低杂散和频率分辨率高的特点,完全满足接收机的指标要求,并能推广应用于其它领域的无线电测控系统。     

一种扩展的顺序迭代过程分析模型

提出一种扩展的顺序迭代过程分析模型,包含的返工影响因子参数考虑了迭代对单个任务返工量的影响以及对任务剩余时间的影响。将描述复杂过程的设计结构矩阵改进为一种扩展的设计结构矩阵,使其能够表示该扩展模型。在模型参数为确定值的条件下,给出过程完工时间的解析计算方法,以软件开发过程为例给出试验计算结果。     

Supporting flexible data distribution in software DSMs

Page-based software DSM systems suffer from false sharing caused by the large sharing granularity,and only support one-dimension Block or Cyclicblock data distribution schemes,Thus applications running on them will suffer from poor data locality and will be able to exploit parallelism only when using a large number of processors,In this paper.a way towards supporting flexible data distribution(FDD) on software DSM system is presented.Small granularity-tunable blocks,the size of which can be set by compiler or programmer,are used to overlap the working data sets distributed among processors.The FDD was implmented on a software DSM system called JIAJIA.Compared with Block/Cyclic-block distribution schemes used by most DSM systems now,experiments show that the proposed way of flexible data distribution is more effective.The performance of the applications used in the experiments is significantly improved.     

基于DSM的分时电价的制定

分时电价体系是电力系统需求侧管理中最有效的经济手段之一.分析了分时电价的影响因素及现状问题,提出了分时电价制定时需遵循的基本原则,建立了分时电价的数学模型,并通过算例分析验证了分时电价的优越性.     

建筑协同设计中冲突模型的研究

在分析了建筑设计的特点和建筑设计冲突产生原因的基础上,提出利用设计结构矩阵(DSM,Design Structure Matrix)建立建筑协同设计中的信息冲突模型。通过分解设计结构矩阵进行冲突检测,对循环迭代任务集进行设计任务之间信息依赖强度值的分析和排序,使冲突在一定程度上得以消解,从而指导建筑设计过程中子任务的重组,规划建筑设计顺序,对建筑设计过程中多学科的协调工作进行最优化处理。