By conducting relative permeability experiments of multi-cycle gas-water displacement and imbibition on natural cores,we discuss relative permeability hysteresis effect in underground gas storage during multi-cycle in...By conducting relative permeability experiments of multi-cycle gas-water displacement and imbibition on natural cores,we discuss relative permeability hysteresis effect in underground gas storage during multi-cycle injection and production.A correction method for relative permeability hysteresis in numerical simulation of water-invaded gas storage has been worked out using the Carlson and Killough models.A geologic model of water-invaded sandstone gas storage with medium-low permeability is built to investigate the impacts of relative permeability hysteresis on fluid distribution and production performance during multi-cycle injection and production of the gas storage.The study shows that relative permeability hysteresis effect occurs during high-speed injection and production in gas storage converted from water-invaded gas reservoir,and leads to increase of gas-water transition zone width and thickness,shrinkage of the area of high-efficiency gas storage,and decrease of the peak value variation of pore volume containing gas,and then reduces the storage capacity,working gas volume,and high-efficiency operation span of the gas storage.Numerical simulations exhibit large prediction errors of performance indexes if this hysteresis effect is not considered.Killough and Carlson methods can be used to correct the relative permeability hysteresis effect in water-invaded underground gas storage to improve the prediction accuracy.The Killough method has better adaptability to the example model.展开更多
On-line measurement for dielectric loss angle can effectively monitor the insulation condition of capacitive equipment in power systems. Synthetic relative measuring methods not only markedly overcome the shortcomings...On-line measurement for dielectric loss angle can effectively monitor the insulation condition of capacitive equipment in power systems. Synthetic relative measuring methods not only markedly overcome the shortcomings of traditional absolute measuring methods but also greatly improve the accuracy of dielectric loss angle measurement. However, synthetic relative measuring methods based on two or three pieces of capacitive equipment do not have the characteristic of generality. In this paper, a principle of synthetic relative measuring method is presented. The example of application for synthetic relative methods based on three and four pieces of capacitive equipment running in the same phase is taken to present the failure judgment matrices for N pieces of equipment. According to these matrices, the fault condition of N pieces of capacitive equipment can be watched, which is more general. Then some problems needing to be concerned along with two diagnostic methods used in diagnostic system are introduced. Finally, two programmable flow charts for the two methods are given and corresponding examples demonstrate their feasibility in practice.展开更多
In the process of designing self-elevating drilling unit, it is important, yet complicated, to use comparison and filtering to select the optimum scheme from the feasible ones. In this research, an index system and me...In the process of designing self-elevating drilling unit, it is important, yet complicated, to use comparison and filtering to select the optimum scheme from the feasible ones. In this research, an index system and methodology for the evaluation of self-elevating drilling unit was proposed. Based on this, a multi-objective combinatorial optimization model was developed, using the improved grey relation Analysis （GRA）, in which the analytic hierarchy process （AHP） was used to determine the weights of the evaluating indices. It considered the connections within the indices, reflecting the objective nature of things, and also considered the subjective interests of ship owners and the needs of designers. The evaluation index system and evaluation method can be used in the selection of an optimal scheme and advanced assessment. A case study shows the index system and evaluation method are scientific, reasonable, and easy to put into practice. At the same time, such an evaluation index system and evaluation method will be helpful for making decisions for other mobile platforms.展开更多
目的分析呼吸科住院患者护理工作量的影响因素,探究呼吸科住院患者护理工作量和并发症与合并症指数(Complication and Comorbidity Index,CCI)的剂量-反应关系,为临床患者管理及护理人力资源配置提供参考。方法选取呼吸内科1121例住院...目的分析呼吸科住院患者护理工作量的影响因素,探究呼吸科住院患者护理工作量和并发症与合并症指数(Complication and Comorbidity Index,CCI)的剂量-反应关系,为临床患者管理及护理人力资源配置提供参考。方法选取呼吸内科1121例住院患者作为研究对象,以病案回顾法,根据医院信息系统电子病历和护理执行单获取患者住院期间每天的护理项目及执行频次,计算护理总工时,通过多元线性回归分析护理工作量的影响因素,采用限制性立方样条探究CCI与护理工作量之间的剂量-反应关系。结果回归分析结果显示,患者年龄、入院途径、住院次数、CCI、呼吸机使用、抗生素使用是护理工作量的影响因素(均P<0.05)。限制性立方样条结果显示,CCI与护理工作量之间存在剂量-反应关系(P_(总体趋势)<0.05,P_(非线性)<0.05),当CCI>0.066时,护理工作量随着CCI的增长不断增大,根据不同年龄段、入院途径、住院次数及是否使用呼吸机和抗生素进行分组探究显示,不同临床特征患者护理工作量间存在差异(均P<0.05)。结论CCI和护理工作量之间存在剂量-反应关系,是呼吸科患者住院期间护理工作量的有效预测因子。建议护理管理者结合患者CCI和其他临床特征科学地进行护理人力资源配置,提高护理人力资源利用效率。展开更多
The preference analysis is a class of important issues in multi-criteria ordinal decision making.The rough set is an effective approach to handle preference analysis.In order to solve the multi-criteria preference ana...The preference analysis is a class of important issues in multi-criteria ordinal decision making.The rough set is an effective approach to handle preference analysis.In order to solve the multi-criteria preference analysis problems,this paper improves the preference relation rough set model and expands it to multi-granulation cases.Cost is also an important issue in the field of decision analysis.Taking the cost into consideration,we also expand the model to the cost sensitive multi-granulation preference relation rough set.Some theorems are represented,and the granule structure selection based on approximation quality is investigated.The experimental results show that the multi-granulation preference rough set approach with the consideration of cost has a better performance in granule structure selection than that without cost consideration.展开更多
Purpose:To reveal the typical features of text duplication in papers from four medical fields:basic medicine,health management,pharmacology and pharmacy,and public health and preventive medicine.To analyze the reasons...Purpose:To reveal the typical features of text duplication in papers from four medical fields:basic medicine,health management,pharmacology and pharmacy,and public health and preventive medicine.To analyze the reasons for duplication and provide suggestions for the management of medical academic misconduct.Design/methodology/approach:In total,2,469 representative Chinese journal papers were included in our research,which were submitted by researchers in 2020 and 2021.A plagiarism check was carried out using the Academic Misconduct Literature Check System(AMLC).We generated a corrected similarity index based on the AMLC general similarity index for further analysis.We compared the similarity indices of papers in four medical fields and revealed their trends over time;differences in similarity index between review and research articles were also analyzed according to the different fields.Further analysis of 143 papers suspected of plagiarism was also performed from the perspective of sections containing duplication and according to the field of research.Findings:Papers in the field of pharmacology and pharmacy had the highest similarity index(8.67±5.92%),which was significantly higher than that in other fields,except health management.The similarity index of review articles(9.77±10.28%)was significantly higher than that of research articles(7.41±6.26%).In total,143 papers were suspected of plagiarism(5.80%)with similarity indices≥15%;most were papers on health management(78,54.55%),followed by public health and preventive medicine(38,26.58%);90.21%of the 143 papers had duplication in multiple sections,while only 9.79%had duplication in a single section.The distribution of sections with duplication varied among different fields;papers in pharmacology and pharmacy were more likely to have duplication in the data/methods and introduction/background sections,however,papers in health management were more likely to contain duplication in the introduction/background or results/discussion sections.Different structures for papers in different fields may have caused these differences.Research limitations:There were three limitations to our research.Firstly,we observed that a small number of papers have been checked early.It is unknown who conducted the plagiarism check as this can be included in other evaluations,such as applications for Science and technology projects or awards.If the authors carried out the check,text with high similarity indices may have been excluded before submission,meaning the similarity index in our research may have been lower than the original value.Secondly,there were only four medical fields included in our research.Additional analysis on a wider scale is required in the future.Thirdly,only a general similarity index was calculated in our study;other similarity indices were not tested.Practical implications:A comprehensive analysis of similarity indices in four medical fields was performed.We made several recommendations for the supervision of medical academic misconduct and the formation of criteria for defining suspected plagiarism for medical papers,as well as for the improved accuracy of text duplication checks.Originality/value:We quantified the differences between the AMLC general similarity index and the corrected index,described the situation around text duplication and plagiarism in papers from four medical fields,and revealed differences in similarity indices between different article types.We also revealed differences in the sections containing duplication for papers with suspected plagiarism among different fields.展开更多
Purpose： The main goal of this study is to discover the scientific evolution of Cancer-Related Symptoms in Complementary and Alternative Medicine research area, analyzing the articles indexed in the Web of Science da...Purpose： The main goal of this study is to discover the scientific evolution of Cancer-Related Symptoms in Complementary and Alternative Medicine research area, analyzing the articles indexed in the Web of Science database from 1980 to 2013.Design/Methodology/Approach： A co-word science mapping analysis is performed under a longitudinal framework（1980 to 2013）. The documental corpus is divided into two subperiods,1980–2008 and 2009–2013. Thus, the performance and impact rates, and conceptual evolution of the research field are shown.Findings： According to the results, the co-word analysis allows us to identify 12 main thematic areas in this emerging research field： anxiety, survivors and palliative care,meditation, treatment, symptoms and cancer types, postmenopause, cancer pain, low back pain, herbal medicine, children, depression and insomnia, inflammation mediators, and lymphedema. The different research lines are identified according to the main thematic areas,centered fundamentally on anxiety and suffering prevention. The scientific community can use this information to identify where the interest is focused and make decisions in different ways.Research limitation： Several limitations can be addressed： 1） some of the Complementary and Alternative Medicine therapies may not have been included; 2） only the documents indexed in Web of Science are analyzed; and 3） the thematic areas detected could change if another dataset was considered.Practical implications： The results obtained in the present study could be considered as an evidence-based framework in which future studies could be built.Originality/value： Currently, there are no studies that show the thematic evolution of this research area.展开更多
In this paper,with the relative Morse index,we will study the existence of solutions of(1.1)under the assumptions that V satisfies some weaker conditions than those in[2].
综述了疾病诊断相关分组(Diagnosis Related Groups,DRG)的国内外发展状况、对绩效的评价方式,从护理工作量、护理不良事件、护理成本、护理职业发展方面进行梳理,阐释了DRG对护理管理产生的影响,并针对DRG改革下护理绩效模式、护士分...综述了疾病诊断相关分组(Diagnosis Related Groups,DRG)的国内外发展状况、对绩效的评价方式,从护理工作量、护理不良事件、护理成本、护理职业发展方面进行梳理,阐释了DRG对护理管理产生的影响,并针对DRG改革下护理绩效模式、护士分级、预测护士数量、平衡护理成本、提升护理工作效率等方面提出护理管理策略,以期促进护理管理者探索护理管理新模式。展开更多
目的利用疾病诊断相关分组(diagnosis related group,DRG)数据,分析大型公立医院重点科室病组结构及变化趋势,探究科室病组干预及优化重点,进而推动科室资源合理统筹。方法回顾性收集北京市某大型公立医院2个外科科室2017—2023年的DRG...目的利用疾病诊断相关分组(diagnosis related group,DRG)数据,分析大型公立医院重点科室病组结构及变化趋势,探究科室病组干预及优化重点,进而推动科室资源合理统筹。方法回顾性收集北京市某大型公立医院2个外科科室2017—2023年的DRG数据。在2个外科科室病例组合指数(case mix index,CMI)出现下降时,均及时采用绩效考核、科室宣教、院内公示等方式进行干预,观察CMI值变化,并分析其病组权重、时间消耗指数、费用消耗指数、低风险组死亡率等变化趋势。结果干预后,外科一权重较低的病组,如甲状腺大手术(KD1)收治比例明显降低,权重较高的病组,如结直肠恶性肿瘤手术(GB2)、胰腺恶性肿瘤手术(HB1)收治比例明显增加;外科二权重较低的病组,如化疗(RE1)收治比例明显降低,权重较高的病组,如肾、输尿管及膀胱恶性肿瘤的大手术(LA1)、肾上腺手术(KC1)、除恶性肿瘤大手术外的肾/输尿管/膀胱手术(LB1)、男性生殖器官恶性肿瘤手术(MA1)收治比例明显增加,2个科室均实现了CMI值上升的目标。从效率、费用、质量指标看,2个科室的时间消耗指数与费用消耗指数均显著低于1,低风险组死亡率均为0。结论大型公立医院立足实际、结合发展目标,通过合理干预,可实现CMI值提升与病组结构优化,提高医疗效率和资源合理利用。展开更多
基金Supported by the Petro China Science and Technology Major Project(2015E-4002)。
文摘By conducting relative permeability experiments of multi-cycle gas-water displacement and imbibition on natural cores,we discuss relative permeability hysteresis effect in underground gas storage during multi-cycle injection and production.A correction method for relative permeability hysteresis in numerical simulation of water-invaded gas storage has been worked out using the Carlson and Killough models.A geologic model of water-invaded sandstone gas storage with medium-low permeability is built to investigate the impacts of relative permeability hysteresis on fluid distribution and production performance during multi-cycle injection and production of the gas storage.The study shows that relative permeability hysteresis effect occurs during high-speed injection and production in gas storage converted from water-invaded gas reservoir,and leads to increase of gas-water transition zone width and thickness,shrinkage of the area of high-efficiency gas storage,and decrease of the peak value variation of pore volume containing gas,and then reduces the storage capacity,working gas volume,and high-efficiency operation span of the gas storage.Numerical simulations exhibit large prediction errors of performance indexes if this hysteresis effect is not considered.Killough and Carlson methods can be used to correct the relative permeability hysteresis effect in water-invaded underground gas storage to improve the prediction accuracy.The Killough method has better adaptability to the example model.
文摘On-line measurement for dielectric loss angle can effectively monitor the insulation condition of capacitive equipment in power systems. Synthetic relative measuring methods not only markedly overcome the shortcomings of traditional absolute measuring methods but also greatly improve the accuracy of dielectric loss angle measurement. However, synthetic relative measuring methods based on two or three pieces of capacitive equipment do not have the characteristic of generality. In this paper, a principle of synthetic relative measuring method is presented. The example of application for synthetic relative methods based on three and four pieces of capacitive equipment running in the same phase is taken to present the failure judgment matrices for N pieces of equipment. According to these matrices, the fault condition of N pieces of capacitive equipment can be watched, which is more general. Then some problems needing to be concerned along with two diagnostic methods used in diagnostic system are introduced. Finally, two programmable flow charts for the two methods are given and corresponding examples demonstrate their feasibility in practice.
基金Supported by the National 863 Plan Foundation under Grant No.2003AA414060
文摘In the process of designing self-elevating drilling unit, it is important, yet complicated, to use comparison and filtering to select the optimum scheme from the feasible ones. In this research, an index system and methodology for the evaluation of self-elevating drilling unit was proposed. Based on this, a multi-objective combinatorial optimization model was developed, using the improved grey relation Analysis （GRA）, in which the analytic hierarchy process （AHP） was used to determine the weights of the evaluating indices. It considered the connections within the indices, reflecting the objective nature of things, and also considered the subjective interests of ship owners and the needs of designers. The evaluation index system and evaluation method can be used in the selection of an optimal scheme and advanced assessment. A case study shows the index system and evaluation method are scientific, reasonable, and easy to put into practice. At the same time, such an evaluation index system and evaluation method will be helpful for making decisions for other mobile platforms.
文摘目的分析呼吸科住院患者护理工作量的影响因素,探究呼吸科住院患者护理工作量和并发症与合并症指数(Complication and Comorbidity Index,CCI)的剂量-反应关系,为临床患者管理及护理人力资源配置提供参考。方法选取呼吸内科1121例住院患者作为研究对象,以病案回顾法,根据医院信息系统电子病历和护理执行单获取患者住院期间每天的护理项目及执行频次,计算护理总工时,通过多元线性回归分析护理工作量的影响因素,采用限制性立方样条探究CCI与护理工作量之间的剂量-反应关系。结果回归分析结果显示,患者年龄、入院途径、住院次数、CCI、呼吸机使用、抗生素使用是护理工作量的影响因素(均P<0.05)。限制性立方样条结果显示,CCI与护理工作量之间存在剂量-反应关系(P_(总体趋势)<0.05,P_(非线性)<0.05),当CCI>0.066时,护理工作量随着CCI的增长不断增大,根据不同年龄段、入院途径、住院次数及是否使用呼吸机和抗生素进行分组探究显示,不同临床特征患者护理工作量间存在差异(均P<0.05)。结论CCI和护理工作量之间存在剂量-反应关系,是呼吸科患者住院期间护理工作量的有效预测因子。建议护理管理者结合患者CCI和其他临床特征科学地进行护理人力资源配置,提高护理人力资源利用效率。
基金supported in part by Natural Science Foundation of Education Department of Sichuan Province under Grant No.12ZA178Key Technology Support Program of Sichuan Province under Grant No.2015GZ0102+1 种基金Science and Technology Project of Chongqing Municipal Education Commission under Grant No.KJ1400407Chongqing Science and Technology Commission Project under Grant No.cstc2014jcyj A10051
文摘The preference analysis is a class of important issues in multi-criteria ordinal decision making.The rough set is an effective approach to handle preference analysis.In order to solve the multi-criteria preference analysis problems,this paper improves the preference relation rough set model and expands it to multi-granulation cases.Cost is also an important issue in the field of decision analysis.Taking the cost into consideration,we also expand the model to the cost sensitive multi-granulation preference relation rough set.Some theorems are represented,and the granule structure selection based on approximation quality is investigated.The experimental results show that the multi-granulation preference rough set approach with the consideration of cost has a better performance in granule structure selection than that without cost consideration.
基金supported by Chinese Academy of Medical Sciences Innovation Fund for Medical Sciences (Grant No.2021-I2M-1-033)。
文摘Purpose:To reveal the typical features of text duplication in papers from four medical fields:basic medicine,health management,pharmacology and pharmacy,and public health and preventive medicine.To analyze the reasons for duplication and provide suggestions for the management of medical academic misconduct.Design/methodology/approach:In total,2,469 representative Chinese journal papers were included in our research,which were submitted by researchers in 2020 and 2021.A plagiarism check was carried out using the Academic Misconduct Literature Check System(AMLC).We generated a corrected similarity index based on the AMLC general similarity index for further analysis.We compared the similarity indices of papers in four medical fields and revealed their trends over time;differences in similarity index between review and research articles were also analyzed according to the different fields.Further analysis of 143 papers suspected of plagiarism was also performed from the perspective of sections containing duplication and according to the field of research.Findings:Papers in the field of pharmacology and pharmacy had the highest similarity index(8.67±5.92%),which was significantly higher than that in other fields,except health management.The similarity index of review articles(9.77±10.28%)was significantly higher than that of research articles(7.41±6.26%).In total,143 papers were suspected of plagiarism(5.80%)with similarity indices≥15%;most were papers on health management(78,54.55%),followed by public health and preventive medicine(38,26.58%);90.21%of the 143 papers had duplication in multiple sections,while only 9.79%had duplication in a single section.The distribution of sections with duplication varied among different fields;papers in pharmacology and pharmacy were more likely to have duplication in the data/methods and introduction/background sections,however,papers in health management were more likely to contain duplication in the introduction/background or results/discussion sections.Different structures for papers in different fields may have caused these differences.Research limitations:There were three limitations to our research.Firstly,we observed that a small number of papers have been checked early.It is unknown who conducted the plagiarism check as this can be included in other evaluations,such as applications for Science and technology projects or awards.If the authors carried out the check,text with high similarity indices may have been excluded before submission,meaning the similarity index in our research may have been lower than the original value.Secondly,there were only four medical fields included in our research.Additional analysis on a wider scale is required in the future.Thirdly,only a general similarity index was calculated in our study;other similarity indices were not tested.Practical implications:A comprehensive analysis of similarity indices in four medical fields was performed.We made several recommendations for the supervision of medical academic misconduct and the formation of criteria for defining suspected plagiarism for medical papers,as well as for the improved accuracy of text duplication checks.Originality/value:We quantified the differences between the AMLC general similarity index and the corrected index,described the situation around text duplication and plagiarism in papers from four medical fields,and revealed differences in similarity indices between different article types.We also revealed differences in the sections containing duplication for papers with suspected plagiarism among different fields.
基金supported by the Andalusian Excellence Project TIC-5991Spanish National Project TIN2016-75850-RJ.A.Moral-Munoz held an FPU scholarship (AP2012-1789) from the Spanish Ministry of Education
文摘Purpose： The main goal of this study is to discover the scientific evolution of Cancer-Related Symptoms in Complementary and Alternative Medicine research area, analyzing the articles indexed in the Web of Science database from 1980 to 2013.Design/Methodology/Approach： A co-word science mapping analysis is performed under a longitudinal framework（1980 to 2013）. The documental corpus is divided into two subperiods,1980–2008 and 2009–2013. Thus, the performance and impact rates, and conceptual evolution of the research field are shown.Findings： According to the results, the co-word analysis allows us to identify 12 main thematic areas in this emerging research field： anxiety, survivors and palliative care,meditation, treatment, symptoms and cancer types, postmenopause, cancer pain, low back pain, herbal medicine, children, depression and insomnia, inflammation mediators, and lymphedema. The different research lines are identified according to the main thematic areas,centered fundamentally on anxiety and suffering prevention. The scientific community can use this information to identify where the interest is focused and make decisions in different ways.Research limitation： Several limitations can be addressed： 1） some of the Complementary and Alternative Medicine therapies may not have been included; 2） only the documents indexed in Web of Science are analyzed; and 3） the thematic areas detected could change if another dataset was considered.Practical implications： The results obtained in the present study could be considered as an evidence-based framework in which future studies could be built.Originality/value： Currently, there are no studies that show the thematic evolution of this research area.
基金Supported by DEU of Henan(Grant No.19A110011)and PSF of China(Grant No.188576).
文摘In this paper,with the relative Morse index,we will study the existence of solutions of(1.1)under the assumptions that V satisfies some weaker conditions than those in[2].
文摘综述了疾病诊断相关分组(Diagnosis Related Groups,DRG)的国内外发展状况、对绩效的评价方式,从护理工作量、护理不良事件、护理成本、护理职业发展方面进行梳理,阐释了DRG对护理管理产生的影响,并针对DRG改革下护理绩效模式、护士分级、预测护士数量、平衡护理成本、提升护理工作效率等方面提出护理管理策略,以期促进护理管理者探索护理管理新模式。
文摘目的利用疾病诊断相关分组(diagnosis related group,DRG)数据,分析大型公立医院重点科室病组结构及变化趋势,探究科室病组干预及优化重点,进而推动科室资源合理统筹。方法回顾性收集北京市某大型公立医院2个外科科室2017—2023年的DRG数据。在2个外科科室病例组合指数(case mix index,CMI)出现下降时,均及时采用绩效考核、科室宣教、院内公示等方式进行干预,观察CMI值变化,并分析其病组权重、时间消耗指数、费用消耗指数、低风险组死亡率等变化趋势。结果干预后,外科一权重较低的病组,如甲状腺大手术(KD1)收治比例明显降低,权重较高的病组,如结直肠恶性肿瘤手术(GB2)、胰腺恶性肿瘤手术(HB1)收治比例明显增加;外科二权重较低的病组,如化疗(RE1)收治比例明显降低,权重较高的病组,如肾、输尿管及膀胱恶性肿瘤的大手术(LA1)、肾上腺手术(KC1)、除恶性肿瘤大手术外的肾/输尿管/膀胱手术(LB1)、男性生殖器官恶性肿瘤手术(MA1)收治比例明显增加,2个科室均实现了CMI值上升的目标。从效率、费用、质量指标看,2个科室的时间消耗指数与费用消耗指数均显著低于1,低风险组死亡率均为0。结论大型公立医院立足实际、结合发展目标,通过合理干预,可实现CMI值提升与病组结构优化,提高医疗效率和资源合理利用。
