高等教育经济复合系统协调度优化控制     

苗红  韩文秀 《黑龙江高教研究》2006,(11):17-19

文章以系统科学为指导,基于系统协调度理论模型以及协调发展度预测模型的动态行为特性,建立了“高等教育-经济”系统的混沌控制优化模型。为高等教育经济复合系统协调发展趋势、控制策略的研究奠定理论基础。  相似文献   

A Note on the Use of Mixture Models for Individual Prediction     

Veronica T. Cole  Daniel J. Bauer 《Structural equation modeling》2016,23(4):615-631

Mixture models capture heterogeneity in data by decomposing the population into latent subgroups, each of which is governed by its own subgroup-specific set of parameters. Despite the flexibility and widespread use of these models, most applications have focused solely on making inferences for whole or subpopulations, rather than individual cases. This article presents a general framework for computing marginal and conditional predicted values for individuals using mixture model results. These predicted values can be used to characterize covariate effects, examine the fit of the model for specific individuals, or forecast future observations from previous ones. Two empirical examples are provided to demonstrate the usefulness of individual predicted values in applications of mixture models. The first example examines the relative timing of initiation of substance use using a multiple event process survival mixture model, whereas the second example evaluates changes in depressive symptoms over adolescence using a growth mixture model.  相似文献   

20世纪散曲学史（一）     

杨栋  赵晓龙 《河北师范大学学报(哲学社会科学版)》2002,25(6):69-73

散曲，一种被历史遗忘了的诗体和学问，在“五四”白话诗文运动的召唤下突然苏醒，经过近百年的发展，至世纪末已蔚为一门与诗词和戏曲相平行的独立学科。描写散曲学几起几落的盛衰消长印迹，记录那些曾在这一倍受冷落的边缘地带辛苦耕耘的学者，采集品味他们所取得的丰硕成果，反思本学科的局限与不足，预测未来的发展走向，为新世纪有志修习此道者提供一个坚实的作业平台，已是世纪之交刻不容缓的学术期待。  相似文献   

基于神经网络的体外预应力筋极限应力的预测     

杨坚  赵志曼  潘杰  唐琼 《云南电大学报》2007,9(4):83-87

鉴于影响体外预应力筋极限应力的因素较多,采用BP和RBF两种人工神经网络模拟方法进行体外预应力筋极限应力进行预测。通过和试验数据比较分析,预测结果与试验结果的相对误差均在10%以内,满足工程需要,因此,采用神经网络预测体外预应力筋极限应力是可行的。  相似文献   

基于灰色预测与BP神经网络的全球温度预测研究     

朱圣耀  陈劲杰 《教育技术导刊》2020,19(2):105-109

为深入了解全球变暖缘由及影响,探究变暖是否停滞,考虑地球吸热、散热及海洋温度变化等因素,构建一种全球温度预测模型,预测未来25年温度变化。采用主成分分析法找出贡献度较大的3个主成分,再用3组灰色预测模型预测海洋平均温度、二氧化碳排放量、太阳长波辐射等8个变量,并进行光滑比、级比和残差检验。结果表明,预测符合前29年（1990-2018年）时间序列图规律,用历史数据训练BP神经网络,然后把8个变量的预测值代入神经网络,拟合优度为0.922 72,精度非常高,可以看出全球平均温度距平序列越来越大,说明温度正逐渐升高,而不是停滞。  相似文献   

Audio steganalysis based on ＂negative resonance phenomenon＂ caused by steganographic tools   总被引：1，自引：0，他引：1  

RU Xue-min ZHUANG Yue-ting WU Fei 《浙江大学学报(A卷英文版)》2006,7(4):577-583

INTRODUCTION With the rapid progress in the Internet and ex- panded area of multimedia technology, steganogra- phy and steganalysis as subfields of information se- curity have developed rapidly and drawn more and more attention. Steganography is the art of hiding and transmitting data through apparently innocuous car- riers in an effort to conceal the existence of the secret data (Peticolas et al., 1999). While steganalysis, the countermeasure to steganography, is an art that de- tects ev…  相似文献   

Accounting for Model Uncertainty in the Prediction of University Graduation Rates     

Cullen F. Goenner  Sean M. Snaith 《Research in higher education》2004,45(1):25-41

Empirical analysis requires researchers to choose which variables to use as controls in their models. Theory should dictate this choice, yet often in social science there are several theories that may suggest the inclusion or exclusion of certain variables as controls. The result of this is that researchers may use different variables in their models and come to disparate conclusions with respect to predicted effects and their statistical significance. In such cases one is uncertain of which particular set of regressors forms the model that represents the data. The approach used below accounts for uncertainty in variable selection by using Bayesian model averaging (BMA). Accounting for uncertainty, we demonstrate that BMA provides better out-of-sample prediction for university graduation rates than results based on alternative variable selection methods.  相似文献   

Fast combination of scheduling chains under resource and time constraints     

WANG Ji-min PAN Xue-zeng WANG Jie-bing SUN Kang 《浙江大学学报(A卷英文版)》2007,8(1):119-126

  相似文献   

杂交稻分蘖和乳熟期~(32)P、~(14)C 分布与分蘖数和谷产量     

王永锐  陈坤朝  刘振声 《中山大学学报论丛》1989,(5)

8个杂交水稻组合的分蘖数,与分蘖期~(32)P及~(14)C在分蘖的分布(％)呈显著正相关,相关系数分别为r=0.569(n=21),r=0.532(n=22)。谷粒产量与分蘖期~(32)P在分蘖分布(％)的相关系数r=0.604(n=14)。谷粒产量与乳熟期~(14)C—葡萄糖同化物在稻穗分布(％)呈显著正相关,r=0.616(n=25)。高产杂交水稻威优64、汕优66、源优植和广优56的谷粒产量与~(14)C在乳熟期稻穗的分布和从剑叶的输出率相关系数大,低产杂交水稻汕A×芦36—1,D优66等相关系数小。讨论了~(32)P、~(14)C在分蘖和稻穗的分布动态,可作为预测杂交水稻产量的指标。  相似文献   

小康示范村总体规划中人口规模预测研究——以南阳新野县李湖村为例     

白景锋 《南阳师范学院学报》2007,6(3):66-68

首先分析了影响村镇人口规模的主要因素有计划生育政策、环境因素、产业结构、行政因素等，然后对常用人口预测方法进行了评价，在此基础上以南阳新野县李湖小康示范村为例，根据得到的资料，结合规划区的实际情况和规划人员的能力选择适宜的方法进行预测，通过比较综合，得到规划期的人口规模。  相似文献