为解决因新机备件历史消耗数据相对较少而给备件预测工作带来的困难,提出应用最小二乘支持向量机(least squares support vector machine,LS-SVM)回归算法来实现新机备件需求的预测。阐述了最小二乘支持向量机的基本原理,建立了新机备...为解决因新机备件历史消耗数据相对较少而给备件预测工作带来的困难,提出应用最小二乘支持向量机(least squares support vector machine,LS-SVM)回归算法来实现新机备件需求的预测。阐述了最小二乘支持向量机的基本原理,建立了新机备件需求的预测模型,选取核函数,采用LS-SVM对训练样本进行学习,对其网格结构参数进行训练,通过十字交叉验证(cross-validation)和网格搜索(grid-search)确定最优参数,利用训练后的LS-SVM对新机备件需求进行预测,并进行算例仿真。结果表明,LS-SVM在新机备件需求预测上表现优秀。展开更多
研究以黄鹤楼大清香和汾酒为主要研究对象,采用全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOF MS)技术对六种南北派大清香白酒的挥发性成分进行分析...研究以黄鹤楼大清香和汾酒为主要研究对象,采用全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOF MS)技术对六种南北派大清香白酒的挥发性成分进行分析,在6种样品中共筛选出302种香气贡献度较高的挥发性化合物,其中种类最多的是酯类化合物,共检测到88种,其次是醇类化合物检测到52种,机酸类化合物18种,醛酮类化合物47种,烃类化合物32种,呋喃类化合物8种,萜烯类化合物9种,芳香族化合物40种,吡嗪类化合物3种,其他类化合物5种。由于呋喃类和萜烯类化合物通常具有特殊的香气,对清香型白酒的香气产生重要影响,因而,本文在鉴定出的挥发性香气组分中着重对比分析了呋喃类和萜烯类。通过GC×GC-TOFMS技术在六种清香型白酒中确定出40种主要区分南北派大清香白酒香气的差异性挥发物质,其中酯类化合物4种,醇类化合物14种,醛酮类化合物15种,芳香族化合物4种,稀萜类化合物1种,其他类化合物2种。该研究为清香型白酒的挥发性香气组分分析与感官特征评价提供依据。展开更多
OBJECTIVE: To compare the effects of a series of Traditional Chinese Medicine(TCM) empirical prescriptions with salbutamol and montelukast(SM) in children with asthma.METHODS: A total of 182 children with asthma were ...OBJECTIVE: To compare the effects of a series of Traditional Chinese Medicine(TCM) empirical prescriptions with salbutamol and montelukast(SM) in children with asthma.METHODS: A total of 182 children with asthma were randomized into the TCM group(n = 97) or SM group(n = 85). Patients in the TCM group were treated with a series of TCM prescriptions, whereas those in the SM group received salbutamol and montelukast; both groups received their respective treatment for 12 weeks. Asthma control, changes in scores of TCM symptom patterns, and asthma symptom control(SC) scores after treatment were compared between the two groups.RESULTS: A higher percentage of patients in the TCM group had asthma control compared withthose in the SM group(91.67% and 76.83%, respectively, P = 0.006). Scores for abnormal feces(P <0.001), hyperhidrosis(P < 0.001), and tongue appearance(P = 0.001) in the TCM group were significantly better than those in the SM group. However,the total scores of TCM symptom patterns and SC scores did not differ significantly between the two groups(P > 0.05).CONCLUSION: Compared with salbutamol and montelukast, the TCM prescriptions tested were better for symptom control in children with asthma.展开更多
文摘为解决因新机备件历史消耗数据相对较少而给备件预测工作带来的困难,提出应用最小二乘支持向量机(least squares support vector machine,LS-SVM)回归算法来实现新机备件需求的预测。阐述了最小二乘支持向量机的基本原理,建立了新机备件需求的预测模型,选取核函数,采用LS-SVM对训练样本进行学习,对其网格结构参数进行训练,通过十字交叉验证(cross-validation)和网格搜索(grid-search)确定最优参数,利用训练后的LS-SVM对新机备件需求进行预测,并进行算例仿真。结果表明,LS-SVM在新机备件需求预测上表现优秀。
文摘研究以黄鹤楼大清香和汾酒为主要研究对象,采用全二维气相色谱-飞行时间质谱(comprehensive two-dimensional gas chromatography/time-of-flight mass spectrometry,GC×GC-TOF MS)技术对六种南北派大清香白酒的挥发性成分进行分析,在6种样品中共筛选出302种香气贡献度较高的挥发性化合物,其中种类最多的是酯类化合物,共检测到88种,其次是醇类化合物检测到52种,机酸类化合物18种,醛酮类化合物47种,烃类化合物32种,呋喃类化合物8种,萜烯类化合物9种,芳香族化合物40种,吡嗪类化合物3种,其他类化合物5种。由于呋喃类和萜烯类化合物通常具有特殊的香气,对清香型白酒的香气产生重要影响,因而,本文在鉴定出的挥发性香气组分中着重对比分析了呋喃类和萜烯类。通过GC×GC-TOFMS技术在六种清香型白酒中确定出40种主要区分南北派大清香白酒香气的差异性挥发物质,其中酯类化合物4种,醇类化合物14种,醛酮类化合物15种,芳香族化合物4种,稀萜类化合物1种,其他类化合物2种。该研究为清香型白酒的挥发性香气组分分析与感官特征评价提供依据。
基金Supported by a Major Research Project of Shanghai Traditional Chinese Medicine Three-year Action Plan(No.ZYSNXD-CC-ZDYJ034)Shanghai Science and Technology Research Program(No.12401905500)a Development Project of Shanghai Peak Disciplines-Integrated Chinese and Western Medicine(No.20150407)
文摘OBJECTIVE: To compare the effects of a series of Traditional Chinese Medicine(TCM) empirical prescriptions with salbutamol and montelukast(SM) in children with asthma.METHODS: A total of 182 children with asthma were randomized into the TCM group(n = 97) or SM group(n = 85). Patients in the TCM group were treated with a series of TCM prescriptions, whereas those in the SM group received salbutamol and montelukast; both groups received their respective treatment for 12 weeks. Asthma control, changes in scores of TCM symptom patterns, and asthma symptom control(SC) scores after treatment were compared between the two groups.RESULTS: A higher percentage of patients in the TCM group had asthma control compared withthose in the SM group(91.67% and 76.83%, respectively, P = 0.006). Scores for abnormal feces(P <0.001), hyperhidrosis(P < 0.001), and tongue appearance(P = 0.001) in the TCM group were significantly better than those in the SM group. However,the total scores of TCM symptom patterns and SC scores did not differ significantly between the two groups(P > 0.05).CONCLUSION: Compared with salbutamol and montelukast, the TCM prescriptions tested were better for symptom control in children with asthma.
