多元条件密度函数的投影追踪估计方法

由多元条件密度函数fYX(yx)(x∈Rp)可以知道许多被解释变量Y对解释变量X的回归关系的信息,其条件期望就是回归函数,条件方差就是回归误差项的条件方差.为了克服高维空间数据稀松性带来的估计上的困难,提出多元条件密度函数的投影追踪估计方法,通过最小化Ku llback-Le ib ler距离,得到了最优初始条件密度函数和每一步的增量函数和方向向量,还给出了估计步骤及其终止法则.     

N（2，2，0）代数的一类同余分解

对N(2,2,0)代数给出了一类同余分解,探讨了其商代数的代数结构以及自然同态下一类逆象的代数结构.     

Analyzing and Designing Business Processes Management System Based on Transformation of Instantiated Ontology＇s State

The paper discusses efforts of finding a simple and transparent method to analyze business processes and developing its management system architecture. By introducing ontology and its state, the approach tried to find a unified representation and a flexible choreography of business processes. The main idea of the paper is the transformation of ontology＇s states, which are the most important scenarios of enterprises. The business activity composition, that is, case composition based on an AI technique, Case Based Reason （CBR）, which is to solve new problems by retrieving solutions to previous problems, and then store the modified solution. The main interest in CBR relies on that it allows a system to avoid past failures and exploit past successes.     

齿轮齿面接触分析TCA技术及发展动态

通过对齿轮齿面接触分析TCA技术(利用电子计算机进行齿面接触区域的分析和修正)的研究,介绍了齿面接触分析TCA技术的基本原理、发展现状以及发展动态,阐明了TCA技术在现代工业生产中重要意义。     

Performance Analysis of Post-Detection Combining for NFSK and DPSK Systems over Arbitrarily Correlated Nakagami Channels with Distinct Fading Parameters

Introduction Diversity reception, which counters fading and inter- ference in the physical layer and improves system per- formance, is a design methodology used to overcome multipath fading on wireless channels. Various com- bining schemes have been studi…     

Analysis of Water Management in Proton Exchange Membrane Fuel Cells

Introduction Fuel cells provide an environmentally friendly high- efficiency power source that is not limited by the Carot efficiency. The proton exchange membrane fuel cell (PEMFC) is considered to be the most promising can- didate for electric vehicles …     

Thorium-Based Fuel Cycles in the Modular High Temperature Reactor

Introduction The advantages of the modular gas-cooled high tem- perature reactor (HTR) and thorium (Th) based fuel cycles are discussed in this paper. International interest in HTR technology has been increasing in recent years due to a growing recognitio…     

Phase behavior of supercritical CO2 microemulsion with food-grade surfactant AOT

Supercritical CO2 (scCO2) has drawn wide attentions as a cheap and efficient green solvent replacing the conventional organic solvents. These technological ap- plications increase rapidly especially in food-relative industry, such as extractions of beer h…     

Two typical phenomena from the numerical simulation of fire and smoke transport in a gymnasium fire

Building a large centralized atrium in a building has become favourable both to designers and owners. The space of an atrium in a hall, theatre or gymnasium, can occupy an area as large as thousands of square meters and a height as high as 10―30 meters[1…