Lumber moisture content(LMC) is the important parameter to judge the dryness of lumber and the quality of wooden products.Nevertheless the data acquired are mostly redundant and incomplete because of the complexity of...Lumber moisture content(LMC) is the important parameter to judge the dryness of lumber and the quality of wooden products.Nevertheless the data acquired are mostly redundant and incomplete because of the complexity of the course of drying,by interference factors that exist in the dryness environment and by the physical characteristics of the lumber itself.To improve the measuring accuracy and reliability of LMC,the optimal support vector machine(SVM) algorithm was put forward for regression analysis LMC.Environmental factors such as air temperature and relative humidity were considered,the data of which were extracted with the principle component analysis method.The regression and prediction of SVM was optimized based on the grid search(GS) technique.Groups of data were sampled and analyzed,and simulation comparison of forecasting performance shows that the main component data were extracted to speed up the convergence rate of the optimum algorithm.The GS-SVM shows a better performance in solving the LMC measuring and forecasting problem.展开更多
基金supported by the Natural Science Foundation of China(Grant No.31470715),(Grant No.31470714)the Fundamental Research Funds for the Central Universities(2572016EBT1)
文摘Lumber moisture content(LMC) is the important parameter to judge the dryness of lumber and the quality of wooden products.Nevertheless the data acquired are mostly redundant and incomplete because of the complexity of the course of drying,by interference factors that exist in the dryness environment and by the physical characteristics of the lumber itself.To improve the measuring accuracy and reliability of LMC,the optimal support vector machine(SVM) algorithm was put forward for regression analysis LMC.Environmental factors such as air temperature and relative humidity were considered,the data of which were extracted with the principle component analysis method.The regression and prediction of SVM was optimized based on the grid search(GS) technique.Groups of data were sampled and analyzed,and simulation comparison of forecasting performance shows that the main component data were extracted to speed up the convergence rate of the optimum algorithm.The GS-SVM shows a better performance in solving the LMC measuring and forecasting problem.
文摘面向用户生成内容(User generated content,UGC)的进化搜索在大数据及个性化服务领域已引起广泛关注,其关键在于基于多源异构用户生成内容构建用户认知偏好模型,进而设计高效的进化搜索机制.针对此,提出融合注意力机制(Attention mechanism,AM)的受限玻尔兹曼机(Restricted Boltzmann machine,RBM)偏好认知代理模型构建机制,并应用于交互式分布估计算法(Interactive estimation of distribution algorithm,IEDA),设计含用户生成内容的个性化进化搜索策略.基于用户群体提供的文本评论,以及搜索物品的类别文本,构建无监督受限玻尔兹曼机模型提取广义特征;设计注意力机制,融合广义特征,获取对用户认知偏好高度相关特征的集成;利用该特征再次训练受限玻尔兹曼机,实现对用户偏好认知代理模型的构建;根据用户偏好认知代理模型,给出交互式分布估计算法概率更新模型以及物品适应度评价函数,实现物品个性化进化搜索.算法在亚马逊个性化搜索实例的应用验证了用户认知偏好模型的可靠性,以及个性化进化搜索的有效性.
