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数控机床边界强度过程的非等周期不完全预防维修 被引量:1
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作者 王智明 杨建国 《上海交通大学学报》 EI CAS CSCD 北大核心 2013年第11期1661-1665,共5页
基于边界强度过程理论,提出了数控机床在可靠度限制下任意维修质量的非等周期不完全预防维修方法,建立了综合考虑维修对役龄的影响和故障强度随时间增加的混合模型,并且假设修复质量和故障强度增加值均为服从均匀分布的随机变量,以平均... 基于边界强度过程理论,提出了数控机床在可靠度限制下任意维修质量的非等周期不完全预防维修方法,建立了综合考虑维修对役龄的影响和故障强度随时间增加的混合模型,并且假设修复质量和故障强度增加值均为服从均匀分布的随机变量,以平均维修费用为目标函数,用迭代方法给出了非等周期预防维修周期和最佳的维修次数,并结合工程实例讨论了费用参数对平均维修费用的影响. 展开更多
关键词 预防维修 可靠性 边界强度过程 任意维修质量 虚龄
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非完美维修模型下的风电机组最优维修决策 被引量:14
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作者 王金贺 张晓红 曾建潮 《计算机集成制造系统》 EI CSCD 北大核心 2019年第5期1151-1160,共10页
为了使基于可靠度的维修决策与风电场实际运维一致,达到提高风电场整体经济效益的目的,在非完美维修模型的基础上,基于广义更新过程思想构建了风电机组的故障率函数更新模型,进而在考虑维修准备成本和保证风电场基本可用度的前提下提出... 为了使基于可靠度的维修决策与风电场实际运维一致,达到提高风电场整体经济效益的目的,在非完美维修模型的基础上,基于广义更新过程思想构建了风电机组的故障率函数更新模型,进而在考虑维修准备成本和保证风电场基本可用度的前提下提出风电机组的多目标定周期动态非完美预防性维修决策。通过遗传算法求得模型最优解,并将结果与传统完美维修策略和不考虑小修次数对维修准备成本影响的维修策略进行对比,同时对其进行灵敏性分析,验证了模型的有效性、经济性和可行性。 展开更多
关键词 非完美预防性维修 风电机组 维修决策 虚龄因子 故障率加速因子 遗传算法
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不完全修复下PET/CT设备故障分析 被引量:3
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作者 刘龙 陈颖 +2 位作者 储呈晨 孙雨骐 杨海 《中国医疗设备》 2021年第5期130-133,160,共5页
目的PET/CT为医疗诊断重要依据,其购置和维护成本高、折旧年限短,为提高设备的经济效益和社会效益,本文对某医院一台PET/CT设备故障率进行分析,从而帮助医院制定设备管理策略。方法本文收集了设备从安装到使用3年内的故障数据,经过故障... 目的PET/CT为医疗诊断重要依据,其购置和维护成本高、折旧年限短,为提高设备的经济效益和社会效益,本文对某医院一台PET/CT设备故障率进行分析,从而帮助医院制定设备管理策略。方法本文收集了设备从安装到使用3年内的故障数据,经过故障间隔时间趋势检验,采用设备虚龄、不完全修复理论建立了PET/CT的故障率模型。结果模型描述了设备故障率从磨合期经过约4个月逐渐下降到平稳期的过程,设备故障间隔时间从开始的408 h延长到平稳期的653 h,较好地拟合了设备累积故障强度变化趋势。结论本台PET/CT设备服从浴盆曲线过程且处于平稳期,不完全修复模型可应用于服从浴盆曲线的设备。 展开更多
关键词 PET/CT 不完全修复 设备故障率 虚龄 算术降模型
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读书的长征
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作者 许序修 《语文世界(中旬刊)》 2019年第7期4-6,共3页
阅 读 之 窗 一、虚龄十岁考上重点中学 我有一个姐姐和两个哥哥(双胞胎),我从小就跟哥哥玩在一起.哥哥上学了,也带着我一起上学.可能是我专心听课,天资聪颖,没过几天,老师们倒喜欢我了.学期结束考试,老师们也让我参考,结果我比两个哥... 阅 读 之 窗 一、虚龄十岁考上重点中学 我有一个姐姐和两个哥哥(双胞胎),我从小就跟哥哥玩在一起.哥哥上学了,也带着我一起上学.可能是我专心听课,天资聪颖,没过几天,老师们倒喜欢我了.学期结束考试,老师们也让我参考,结果我比两个哥哥考得更好. 展开更多
关键词 上学 老师 学期结束 长征 虚龄 读书 哥哥 考试
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Clinical observation of treatment of infantile diarrhea due to spleen deficiency using five-step pediatric tuina of Huxiang school 被引量:9
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作者 Tang Yu-lan Liu Mai-lan +3 位作者 Yang Qian-yun Yu Jie Yue Zeng-hui Chang Xiao-rong 《Journal of Acupuncture and Tuina Science》 CSCD 2019年第5期328-335,共8页
Objective:To observe the clinical efficacy of treating infantile diarrhea due to spleen deficiency with five-step pediatric tuina of Huxiang school.Methods:Using a randomized controlled trial design,sixty eligible kid... Objective:To observe the clinical efficacy of treating infantile diarrhea due to spleen deficiency with five-step pediatric tuina of Huxiang school.Methods:Using a randomized controlled trial design,sixty eligible kids with diarrhea due to spleen deficiency were randomized into an observation group and a control group,with 30 cases in each group.The observation group was intervened by the five-step pediatric tuina method of Huxiang school,and the control group received conventional tuina treatment.The intervention was conducted once a day,consecutive 5-day treatment as 1 course,at a 2-day interval between courses,successively for a total of 4 courses.Changes in the primary and secondary symptoms of diarrhea due to spleen deficiency were observed,and the clinical efficacy was evaluated.Results:After treatment,the scores of primary and secondary symptoms and the general score of diarrhea due to spleen deficiency were improved;the improvements in fecal form and frequency,decreased appetite,bloating after meals and fatigue and sluggishness were more significant in the observation group than in the control group.Conclusion:The five-step pediatric tuina method of Huxiang school and conventional tuina both can improve the primary and secondary symptoms in infantile diarrhea due to spleen deficiency,while the former one can produce more significant efficacy. 展开更多
关键词 TUINA MASSAGE Pediatric Tuina DIARRHEA Spleen Deficiency Syndrome Child PRESCHOOL
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Clinical observation on moxibustion therapy plus tuina in treating children with recurrent respiratory tract infections due to qi deficiency of spleen and lung 被引量:3
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作者 Xia Yun Cao Zhi-liang +3 位作者 Liu Ying-han Lou Bi-dan Zhang Wei Zhang Fu-qing 《Journal of Acupuncture and Tuina Science》 CSCD 2021年第5期371-377,共7页
Objective:To observe the clinical efficacy of moxibustion therapy plus Liu's pediatric massage(tuina)for children with recurrent respiratory tract infections due to qi deficiency of spleen and lung.Methods:A total... Objective:To observe the clinical efficacy of moxibustion therapy plus Liu's pediatric massage(tuina)for children with recurrent respiratory tract infections due to qi deficiency of spleen and lung.Methods:A total of 60 children who met the inclusion criteria were divided into an observation group and a control group according to the visiting sequence,with 30 cases in each group.Children in the observation group were treated with moxibustion therapy plus Liu's pediatric massage,and those in the control group were treated with Liu's pediatric massage alone.The incidence of respiratory tract infections and traditional Chinese medicine(TCM)symptoms score were observed and recorded in both groups before and after treatment.And the clinical efficacy was compared between the two groups・Results:The total effective rate of the observation group was 93.3%,and that of the control group was 83.3%.The differenee between the two groups was statistically significant(P<0.05).After treatment,the TCM symptoms score and total times of infections in both groups were all statistically different from those before treatment(all P<0.05).The differences in TCM symptoms score and infection frequency before and after treatment in the observation group were statistically different from those in the control group(both P<0.05).Conclusion:Moxibustion therapy plus Liu's pediatric massage has a better effect in improving the clinical symptoms and reducing the frequency of respiratory tract infections for children with recurrent respiratory tract infections due to qi deficiency of spleen and lung than the pediatric massage alone. 展开更多
关键词 Moxibustion Therapy TUINA MASSAGE Pediatric Massage(Tuina) Respiratory Tract Infections Qi Deficiency of Spleen and Lung Child Preschool
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Therapeutic observation of Tui-pushing Wujing plus Chinese patent medicine for infantile diarrhea due to spleen deficiency 被引量:5
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作者 Xu Qian-wei 《Journal of Acupuncture and Tuina Science》 CSCD 2019年第5期336-343,共8页
Objective:To observe the therapeutic efficacy of pediatric tuina plus Chinese patent medicine for preschool kids with diarrhea due to spleen deficiency.Methods:Ninety-two eligible kids were divided into a tuina plus C... Objective:To observe the therapeutic efficacy of pediatric tuina plus Chinese patent medicine for preschool kids with diarrhea due to spleen deficiency.Methods:Ninety-two eligible kids were divided into a tuina plus Chinese patent medicine and a Chinese patent medicine group by the random number table,with 46 cases in each group.The Chinese patent medicine group was intervened by oral administration of Qi Wei Bai Zhu San(Seven-ingredient Atractylodes Macrocepholo Powder);the tuina plus Chinese patent medicine group was additionally given pediatric tuina therapy once a day,20 min each time.Efficacy and safety were evaluated after 7-day treatment in both groups,and a 14-day follow-up was conducted.Results:After treatment,the symptom scores all changed significantly in the two groups(all P<0.05).After intervention,the symptom scores in the tuina plus Chinese patent medicine group were significantly different from those in the Chinese patent medicine group(all P<0.05).The total effective rate was 78.3%in the Chinese patent medicine group,versus 89.1%in the tuina plus Chinese patent medicine group,and the between-group difference was statistically significant(P<0.05).Three cases got a relapse in the Chinese patent medicine group,versus one case in the tuina plus Chinese patent medicine group,and the between-group difference was statistically insignificant(P>0.05).The two groups each had one case of vomiting,which were treated properly and turned better.No other adverse reactions occurred.Conclusion:Tuina plus Chinese patent medicine and Chinese patent medicine alone both are effective for diarrhea due to spleen deficiency in kids,but the combined therapy can produce more significant efficacy. 展开更多
关键词 TUINA MASSAGE Pediatric Tuina Spleen-qi Deficiency DIARRHEA Child PRESCHOOL
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