Extending the information delivery manual approach to identify information requirements for performance analysis of HVAC systems

Heating, Ventilation and Air-Conditioning (HVAC) systems account for more than 15% of the total energy consumption in the US. In order to improve the energy efficiency of HVAC systems, researchers have developed hundreds of algorithms to automatically analyze their performance. However, the complex information, such as configurations of HVAC systems, layouts and materials of building elements and dynamic data from the control systems, required by these algorithms inhibits the process of deploying them in real-world facilities. To address this challenge, we envision a framework that automatically integrates the required information items and provides them to the performance analysis algorithms for HVAC systems. This paper presents an approach to identify and document the information requirements from the publications that describe these algorithms. We extend the Information Delivery Manual (IDM) approach so that the identified information requirements can be mapped to multiple information sources that use various formats and schemas. This paper presents the extensions to the IDM approach and the results of using it to identify information requirements for performance analysis algorithms of HVAC systems.     

基于策略的通用性能控制方法

性能控制功能能够将网络性能的变化过程与网络配置的变化过程相关联。该文提出了一种基于策略的通用性能控制方法,根据DEN-ng模型框架定义了性能控制策略模型,给出了面向网元的性能控制策略冲突检测和解决方法。经实验验证,采用该性能控制方法可以在性能事件的触发下结合性能控制策略动态调整网络配置,以改善网络性能。     

基于动态Copula的风光联合出力建模及动态相关性分析

准确描述风力发电和光伏发电的动态相关性及联合出力的波动性,对风光互补系统的出力预测和经济调度具有重要意义。针对现行静态相关系数无法准确描述风光出力相依关系的问题,研究了风光出力的动态相关性,提出了基于动态Copula函数的风光联合出力模型构建方法。结合实测数据建立了8组动态与静态的风光联合出力Copula模型,用动态相关系数描述风光出力的相关性。运用拟合优度检验方法验证了动态Copula模型对比其静态模型的优越性,选出最优模型。最后将该模型应用在数据驱动的风光联合系统中,验证了其合理性与正确性。     

The influence of combined alignments on lateral acceleration on mountainous freeways: a driving simulator study

Combined horizontal and vertical alignments are frequently used in mountainous freeways in China; however, design guidelines that consider the safety impact of combined alignments are not currently available. Past field studies have provided some data on the relationship between road alignment and safety, but the effects of differing combined alignments on either lateral acceleration or safety have not systematically examined. The primary reason for this void in past research is that most of the prior studies used observational methods that did not permit control of the key variables. A controlled parametric study is needed that examines lateral acceleration as drivers adjust their speeds across a range of combined horizontal and vertical alignments. Such a study was conducted in Tongji University’s eight-degree-of-freedom driving simulator by replicating the full range of combined alignments used on a mountainous freeway in China. Multiple linear regression models were developed to estimate the effects of the combined alignments on lateral acceleration. Based on these models, domains were calculated to illustrate the results and to assist engineers to design safer mountainous freeways.     

基于FPGA实现的PCI-I2S接口转换电路

提出了一种基于FPGA实现的PCI-I2S音频系统方法。通过在FPGA中将PCI软核、FIFO以及设计的接口电路等相结合,在FPGA上实现了PCI、I2C、I2S等多种总线,并且结合音频解码器实现了不同采样频率语音数据的传输以及播放功能。系统充分利用FPGA的片上资源及其可编程特性,减少了硬件电路的复杂度     

基于UML的C3I系统软件建模

UML是一种通过面向对象分析确定由类图和行为图表述的逻辑体系结构和通过面向对象设计确定由构件图和配置图表述的物理体系结构的方法,目前已经成为面向对象分析与设计建模事实上的标准;首先介绍了UML技术及其在开发应用程序中的一般框架,并以此为依据,使用UML结合光电干扰武器系统C3I的建模应用实例对其进行了具体论述。     

基于DSP芯片和无线收发技术的立体车库电气控制系统

为解决立体车库布线复杂、故障定位不准确、电机控制速度缓慢的问题,提出了一种基于DSP和无线收发技术的立体车库电气控制系统。介绍了该系统硬件整体设计及各部分的功能,其中重点介绍利用Atmel公司的AT89C51单片机的数据采集与无线收发单元和利用TI公司的TMS320F2812DSP芯片无线收发与中央处理单元这两部分的设计方法。理论表明,该立体车库电气控制系统可完全满足设计和使用要求。     

Semi-supervised transfer discriminant analysis based on cross-domain mean constraint

In this paper, a novel semi-supervised feature extraction algorithm, i.e., semi-supervised transfer discriminant analysis (STDA) with knowledge transfer capability is proposed, based on the traditional algorithm that cannot get adapted in the change of the learning environment. By using both the pseudo label information from target domain samples and the actual label information from source domain samples in the label iterative refinement process, not only the between-class scatter is maximized while that within-class scatter is minimized, but also the original space structure is maintained via Laplacian matrix, and the distribution difference is reduced by using maximum mean discrepancy as well. Moreover, semi-supervised transfer discriminant analysis based on cross-domain mean constraint (STDA-CMC) is proposed. In this algorithm, the cross-domain mean constraint term is incorporated into STDA, such that knowledge transfer between domains is facilitated by making source and target samples after being projected are located more closely in the low-dimensional feature subspace. The proposed algorithm is proved efficient and feasible from experiments on several datasets.     

Experimental research progress on critical heat flux of Chinese PWR

One of the most important requirements in the design of pressurized water reactor (PWR) is to avoid the occurrence of critical heat flux (CHF). The design criteria for PWR specify that they must be operated at a certain percentage below CHF at all times and locations so as to the cladding temperature of fuel element at safe values. So in the process of safety assessment, CHF is one of important thermal-hydraulic parameters limiting the available power, whose size directly affects safety and economy of PWR nuclear power plant. This paper deals with a summary of experimental research progress on CHF of Chinese PWR. It mainly presents CHF experimental researches of Φ10 fuel assembly, CHF experimental researches of standard fuel assembly, and CHF experimental progress of non-uniform heated rod bundles. It should be emphasized that it also presents experimental research programs on CHF of Chinese advanced fuel assembly with self-reliance copyright. All CHF data obtained will be used for design improvement of Chinese PWR and R&D program of New Generation 1000 MWe PWR.     

基于C30加速器的64Cu核素制备工艺

64Cu是目前应用十分广泛的放射性核素,主要用于PET诊断。本文基于C30加速器对⁶⁴Cu核素的制备工艺进行研究。制靶靶片为金属铜材质,在靶片表面镀金膜,以保护铜基底。镀金完成后用HCl和H₂O₂浸泡镀金层以去除金属杂质,用脉冲电镀法电镀富集⁶⁴Ni层。将靶片转移至C30加速器固体靶站进行辐照,束流能量为15.5 MeV。将辐照后的靶片转移至分离纯化热室。在溶靶槽中加入6 mol/L HCl和30%H2O2溶靶,使用AG1-X8阴离子交换树脂分离纯化,最终获得⁶⁴Cu核素。分别测定64Cu的放射性核纯度、放射化学纯度、金属杂质含量等质量指标。待收集的64Ni溶液衰变完全后,使用AG1-X8树脂回收。检验结果显示,富集64Ni厚度约8.5～16.3 mg/cm²,⁶⁴Cu产能大于37 GBq,产额可达180～250 MBq/(μA·h),放射性核纯度大于99.9%,放射化学纯度大于97.0%,金属杂质含量均小于0.5 μg/GBq。⁶⁴Cu制备工艺稳定、质量可控,达到了规模化生产水平,为⁶⁴Cu相关药物的研究与开发提供了稳定可靠的核素来源。