Subjects: Management Science >> Other Disciplines of Management Science submitted time 2022-09-06
Abstract： From the perspective of production network, this paper discusses how the industrial structure propagate exogenous shocks, which in turn causes macroeconomic fluctuations. Starting with a Cobb-Douglas economy, we investigate the propagation mechanisms of supply-side and demand-side shocks respectively. Then, under more general conditions, it is proved that the propagation effect of the production network will not disappear with the subdivision of the industry, and the method of measuring the propagation effect is improved. The improved measurement method not only broadens the applicability of the original method, but also makes the measurement results more accurate. Using all non-competitive input-output tables since China's accession to the WTO, this paper examines the topology of China's production network, the probability distribution of weighted degrees, and the propagation effect on shocks. Key industries that propagate shocks are also identified. The research finds that China's production network has small-world properties. Unlike developed countries such as the United States, the weighted degree of China's production network follows an exponential distribution rather than a power-law distribution. The average value of the propagation effect of China's production network on shocks is 0.376, of which about 30% of the effect comes from the weight structure of the network. The key industries that propagation shocks are as follows: steel, electricity, heat production and supply, wholesale and retail, automobile manufacturing and construction. According to the characteristics of China's industrial structure, supply-side shocks may cause greater economic losses than demand-side shocks, especially the supply-side shocks in the mining industry. In addition, the optimization and upgrading of the industrial structure will help reduce the propagation effect of the production network, thereby reducing the systemic risks of the economy.
Peer Review Status:
Awaiting Review
Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics submitted time 2023-12-28 Cooperative journals: 《中国全科医学》
Abstract： Background Primary traditional Chinese medicine（TCM） health service has been attracting continuously improving attention. However，primary TCM health service system still has problems，which have constrained the development of TCM in China. Objective To analyze the current situation of primary TCM health service system in China and explore the strategies to continuously improve the capacity of primary TCM health service. Methods In December 2022，data were retrieved from the China Health Statistics Yearbook，National Statistics of Traditional Chinese Medicine，the official websites of the National Bureau of Disease Control and Prevention and the National Center for Cardiovascular Diseases. The index system was constructed from the three levels of health input，service output and health needs，and the combination of rank sum ratio method and the WHO health system performance module framework was used to comprehensively evaluate the current situation of primary TCM health service. Results In terms of health input，from 2017 to 2021，the number of primary healthcare institutions providing TCM health services except for township health centers has increased，and the number of TCM clinical departments beds in community health service centers（stations），township health centers，and outpatient clinics has shown an increasing trend，but the proportion of TCM clinical departments beds in outpatient clinics to the total number of outpatient departments has decreased；the proportion of TCM practicing（assistant） physicians in community health service centers（stations），township health centers and clinics has increased significantly，while the proportion of TCM practicing（assistant） physicians in village clinics remained stable，and the proportion of TCM practicing（assistant） physicians in outpatient clinics decreased by years；in the past five years，the absolute value of financial input for primary healthcare institutions has steadily increased，while the financial allocation for TCM organizations has fluctuatingly decreased. In terms of service output，from 2017 to 2021，the proportion of TCM consultations to the total consultations in various institutions has steadily increased according to a certain increase（except for TCM outpatient clinics），while the proportion of TCM consultations in village clinics alone has always remained above 30.0%；in addition to township health centers，the per capita burden of consultations of TCM practicing（assistant）physicians in other primary healthcare institutions was generally on a downward trend. The comprehensive evaluation found that 2017，2018 and 2021 were in a suitable state of resource allocation，while 2019 and 2020 were in an unbalanced state of resource allocation. Conclusion At present，the construction of primary TCM health service system in China has been effectively implemented，but there are still some problems in the process of orderly promotion. Problems such as insufficient resources for primary TCM，unbalanced service and utilization，insufficient advantages of TCM，imperfect personnel training mechanism and low financial input have constrained the development TCM. In order to promote the continuous improvement of the health service capacity of primary TCM health service institutions，it is necessary to consolidate the functions of government，further promote TCM culture，establish incentive mechanism to optimize the training mode of talents，strengthen the close integration of TCM health services with health insurance policies，and build a TCM medical association supported by "information integration".
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：为了提高风力发电机叶片故障的识别率，利用支持向量机建立风力发电机 叶片故障和特征参数之间的非线性关系。在蜂群算法中引入一种动态柯西因子，动态 调节蜂群寻优过程中的搜索步长，提高蜂群算法的扰动能力，避免蜂群陷入局部搜索， 采用这种动态柯西蜂群算法对支持向量机的参数寻优，建立动态柯西蜂群算法优化的 支持向量机模型。采集南方某风场风力发电机叶片的四种工况下的特征数据训练此模 型并进行故障诊断，诊断结果表明改进后的蜂群算法优化支持向量机模型能够提高风 力发电机叶片的故障识别率，具有一定的工程参考意义。
Subjects: Dynamic and Electric Engineering >> Electrical Engineering submitted time 2019-03-05 Cooperative journals: 《电气工程学报》
Abstract：为了提高风力发电机叶片故障的识别率，利用支持向量机建立风力发电机 叶片故障和特征参数之间的非线性关系。在蜂群算法中引入一种动态柯西因子，动态 调节蜂群寻优过程中的搜索步长，提高蜂群算法的扰动能力，避免蜂群陷入局部搜索， 采用这种动态柯西蜂群算法对支持向量机的参数寻优，建立动态柯西蜂群算法优化的 支持向量机模型。采集南方某风场风力发电机叶片的四种工况下的特征数据训练此模 型并进行故障诊断，诊断结果表明改进后的蜂群算法优化支持向量机模型能够提高风 力发电机叶片的故障识别率，具有一定的工程参考意义。
Subjects: Mechanical Engineering >> Other Disciplines of Mechanical Engineering submitted time 2018-06-15 Cooperative journals: 《电气工程学报》
Abstract： In order to improve the recognition rate of wind turbine blade fault diagnosis, the nonlinear relationship between fault diagnosis and characteristic parameters of wind turbine blade is established by using support vector machine. In the Cauchy artificial bee colony algorithm, a dynamic Cauchy factor is introduced to dynamically adjust the search step in the optimization process of the colony, to improve the perturbation ability of the colony algorithm, and to avoid the colony into the local search. A dynamic support vector machine model for dynamic Cauchy bee colony optimization is established. The model is trained and diagnosed by four conditions of a wind farm in the south. The results show that the support vector machine model can be improved based on the dynamic Cauchy artificial bee colony algorithm. Wind turbine generator fault recognition rate, with a certain engineering reference significance.
Subjects: Biology >> Bioengineering submitted time 2018-06-14 Cooperative journals: 《中国生物工程杂志》
Abstract：高山被孢霉是一种富含多不饱和脂肪酸的丝状真菌,但其脂质过程中NADPH的来源还没有研究透彻。本文以高山被孢霉（尿嘧啶营养缺陷型）作为出发菌株，研究了亚甲基四氢叶酸脱氢酶（MTHFD1）对高山被孢霉脂质合成的影响。首先构建了过表达载体pBIG2-ura5s-MTHFD1，采用根癌土壤杆菌介导转化真菌的方法，将二元表达载体转化进高山被孢霉CCFM501中，在筛选培养基SC-CS平板上进行筛选，进而得到稳定遗传MTHFD1基因的过表达菌株（MA-MTHFD1）；其次提取MA-MTHFD1菌株基因组进行PCR鉴定，并结合qPCR分析结果，表明MTHFD1基因成功在高山被孢霉中实现了过量表达；最后通过对MA-MTHFD1中的脂肪酸含量，NADPH含量及NADPH合成途径中相关基因转录水平进行分析，研究MTHFD1基因过表达对脂质合成的影响。实验结果表明，过表达MTHFD1基因可以提高高山被孢霉脂质合成能力。与原养型高山被孢霉相比，MA-MTHFD1菌株中脂肪酸含量提高了40.13%，NADPH的含量提高了26.45%，而且NADPH合成途径中其他相关基因苹果酸酶（ME）和异柠檬酸脱氢酶（IDH）的转录水平也发生了上调。这一系列研究结果表明在高山被孢霉脂质合成还原力形成中，MTHFD1基因起到了关键作用。本文为解析高山被孢霉中NADPH来源及深入研究脂质合成机理，从而对其胞内脂肪酸代谢通路进行分子水平上的改建提供了一定的理论依据。
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