In recent days,the tent manufacturers in ZhenJiang,JiangSu and TianJin have made all-out efforts to produce the relief tents,which are in urgent need of refugees in quake-hit areas,to show their human’s love to refug...In recent days,the tent manufacturers in ZhenJiang,JiangSu and TianJin have made all-out efforts to produce the relief tents,which are in urgent need of refugees in quake-hit areas,to show their human’s love to refugees in quake-hit area by their actual actions.展开更多
Yuan Xinyao is a pretty 20-something and an outdoor sports enthusiast. Three years ago, Yuan took to such sports as rock climbing, skating, boating, trekking and paragliding. "Outdoor sports offer opportunities f...Yuan Xinyao is a pretty 20-something and an outdoor sports enthusiast. Three years ago, Yuan took to such sports as rock climbing, skating, boating, trekking and paragliding. "Outdoor sports offer opportunities for travel and for fresh, exciting adventures," said Yuan. Later, when she discovered that many others shared her interest,Yuan set up an outdoors club and opened an outdoors equipment shop. "I meant to promote a healthy lifestyle by bringing people close to nature and展开更多
AT the NGO Forum site, the most attractive and busy place in Huairou, Beijing, was composed of two large groups of colorful tents in a variety of shapes. Here, there were
针对股价预测中存在的不确定性、间断性、随机性和非线性等问题,提出一种TRSSA-ELM(Tent Random Walk Sparrow Optimization Algorithm-Extreme Learning Machine)股价预测模型。首先,采用自适应Tent混沌映射和随机游走策略对算法进行改...针对股价预测中存在的不确定性、间断性、随机性和非线性等问题,提出一种TRSSA-ELM(Tent Random Walk Sparrow Optimization Algorithm-Extreme Learning Machine)股价预测模型。首先,采用自适应Tent混沌映射和随机游走策略对算法进行改进,增强种群多样性和随机性,提高算法局部和全局的寻优能力。其次,使用单峰、多峰和固定维多峰测试函数对TRSSA(Tent Random Walk Sparrow Optimization Algorithm)性能进行了验证,相比于SSA(Sparrow Optimization Algorithm)、AO(Aquila Optimizer)、POA(Pelican Optimization Algorithm)和GWO(Grey Wolf Optimizer),TRSSA算法具有更好的收敛速度、精度和统计性质。最后,由于ELM(Extreme Learning Machine)模型随机生成权重和阈值,降低了预测精度和泛化能力,应用TRSSA算法优化ELM模型的权重和阈值,并用三安光电股票数据集对TRSSA-ELM模型进行了测试。实验结果表明,TRSSA-ELM模型相比于SSA-ELM、ELM、SVR(Support Vector Regression)和GBDT(Gradient Boosting Decision Tree),具有更好的预测精度和稳定性。展开更多
文摘In recent days,the tent manufacturers in ZhenJiang,JiangSu and TianJin have made all-out efforts to produce the relief tents,which are in urgent need of refugees in quake-hit areas,to show their human’s love to refugees in quake-hit area by their actual actions.
文摘Yuan Xinyao is a pretty 20-something and an outdoor sports enthusiast. Three years ago, Yuan took to such sports as rock climbing, skating, boating, trekking and paragliding. "Outdoor sports offer opportunities for travel and for fresh, exciting adventures," said Yuan. Later, when she discovered that many others shared her interest,Yuan set up an outdoors club and opened an outdoors equipment shop. "I meant to promote a healthy lifestyle by bringing people close to nature and
文摘AT the NGO Forum site, the most attractive and busy place in Huairou, Beijing, was composed of two large groups of colorful tents in a variety of shapes. Here, there were
