目的：观察中医特色二联疗法对膝骨性关节炎患者功能的影响。方法：将符合纳入标准的72例膝骨性关节炎患者随机分为观察组（特色二联组）和对照组（常规组）,每组各36例。对照组主要包括口服抗骨增生胶囊每次5粒,早中晚各1次/d;口服维生...目的：观察中医特色二联疗法对膝骨性关节炎患者功能的影响。方法：将符合纳入标准的72例膝骨性关节炎患者随机分为观察组（特色二联组）和对照组（常规组）,每组各36例。对照组主要包括口服抗骨增生胶囊每次5粒,早中晚各1次/d;口服维生素C片,2片/次,早中晚各1次/d;注射玻璃酸钠在膝关节每次2 m L,1次/周。观察组是在对照组基础上进行中药溻渍和艾灸,溻渍一般控制在30 min左右,1次/d;艾灸选取内外膝眼、阴陵泉、足三里等穴位,每个穴位1次3壮,一般控制在30 min左右。两组均每周连续治疗5 d,疗程4周。分别于治疗前、治疗4周后进行骨性关节炎指数the Western Ontario and Mc Maste universities（WOMAC）评分,统计治疗效果,并于治疗后3个月随访1次。结果：治疗4周及随访3个月时观察组较对照组疼痛、僵硬、功能障碍评分均明显下降（均P〈0.05）。4周后观察组有效率为91.6%,对照组有效率为72.2%,观察组有效率明显优于对照组（P〈0.05）;3个月随访时观察组有效率为88.8%,对照组有效率为69.4%,观察组有效率明显优于对照组（P〈0.05）。结论：中医特色二联疗法可提高膝骨性关节炎患者临床疗效,有效改善关节功能。展开更多
The domain name system(DNS)provides a mapping service between memorable names and numerical internet protocol addresses,and it is a critical infrastructure of the Internet.The authenticity of DNS resolution results is...The domain name system(DNS)provides a mapping service between memorable names and numerical internet protocol addresses,and it is a critical infrastructure of the Internet.The authenticity of DNS resolution results is crucial for ensuring the accessibility of Internet services.Hundreds of supplementary specifications of protocols have been proposed to compensate for the security flaws of DNS.However,DNS security incidents still occur frequently.Although DNS is a distributed system,for a specified domain name,only authorized authoritative servers can resolve it.Other servers must obtain the resolution result through a recursive or iterative resolving procedure,which renders DNS vulnerable to various attacks,such as DNS cache poisoning and distributed denial of service(DDoS)attacks.This paper proposes a novel decentralized architecture for a DNS data plane,which is called Blockzone.First,Blockzone utilizes novel mechanisms,which include on-chain authorization and off-chain storage,to implement a decentralized and trustworthy DNS data plane.Second,in contrast to the hierarchical authentication and recursive query of traditional DNS,Blockzone implements a decentralized operation model.This model significantly increases the efficiency of domain name resolution and verification and enhances the security of DNS against DDoS and cache poisoning attacks.In addition,Blockzone is fully compatible with the traditional DNS implementation and can be incrementally deployed as a plug-in service of DNS without changing the DNS protocol or system architecture.The Blockzone scheme can also be generalized to address security issues in other areas,such as the Internet of things and edge computing.展开更多
Owing to the heterogeneity between functional units and resource scarcity,manufacturing firms have been struggling with intra-organizational coordination for productivity and innovation.Traditional organizational stru...Owing to the heterogeneity between functional units and resource scarcity,manufacturing firms have been struggling with intra-organizational coordination for productivity and innovation.Traditional organizational structures,such as linear-functional and matrix,may cause responsibility division and independent goals(Shahani,2020),and are more difficult to be adopted by large-sized innovative manufacturing firms for quantity production.This is based on a review of several new forms of organization(i.e.,network organization,multiteam system,and platform organization)compared with the traditional forms of organization(i.e.,linear,matrix,and business unit organization,among others).This study proposes a three-dimensional(3D)magic-cube organizational structure,considering the product dimensions,business,and administration.Moreover,the characteristics,propositions of system operation,system dynamic model,and working model of the 3D magic-cube organization are described.Finally,the 3D model is applied in a Chinese manufacturing firm to test its effectiveness.By redesigning the post and pay system,the pilot organization establishes a project-driven and cross-functional coordination mechanism,positively affecting the firm’s financial profit,output value,labor productivity,and income of per capita.The proposed 3D model can be adopted by large-or medium-sized manufacturing firms for product development and innovation.The implications of both practice and theory are also discussed in this study.展开更多
Surface integrity is the major factor impacting on the operation quality, service life and reliability of the aeroengine components. The surface integrity of aeroengine component is damaged by the failures such as cra...Surface integrity is the major factor impacting on the operation quality, service life and reliability of the aeroengine components. The surface integrity of aeroengine component is damaged by the failures such as crack,deformation, oxidation, corrosion, erosion, and microstructural degeneration. It adopts advanced remanufacturing technologies to restore or improve the surface integrity and regenerate these high value parts. This paper firstly puts forward the concept, namely surface integrity remanufacturing for aeroengine components, and its connotation. The key remanufacturing technologies have been developed to repair the components with surface damages. Ultimately, some application examples of surface integrity remanufacturing technologies as well as their effects in aeroengine maintenance are introduced. The discarded components have been reused and their service lives have been extended and their reliability has been increased by implementing surface integrity remanufacturing. It has realized "The Repaired Components Outpacing the New Ones", material saving, energy saving, and emission reduction.展开更多
The paper puts forward the idea of problembased engineering management, expounds its connotation and guiding ideology and moreover, substantially demonstrates its practical significance in the engineering management s...The paper puts forward the idea of problembased engineering management, expounds its connotation and guiding ideology and moreover, substantially demonstrates its practical significance in the engineering management system for the maintenance of Chinese military aircraft engines.展开更多
文摘目的：观察中医特色二联疗法对膝骨性关节炎患者功能的影响。方法：将符合纳入标准的72例膝骨性关节炎患者随机分为观察组（特色二联组）和对照组（常规组）,每组各36例。对照组主要包括口服抗骨增生胶囊每次5粒,早中晚各1次/d;口服维生素C片,2片/次,早中晚各1次/d;注射玻璃酸钠在膝关节每次2 m L,1次/周。观察组是在对照组基础上进行中药溻渍和艾灸,溻渍一般控制在30 min左右,1次/d;艾灸选取内外膝眼、阴陵泉、足三里等穴位,每个穴位1次3壮,一般控制在30 min左右。两组均每周连续治疗5 d,疗程4周。分别于治疗前、治疗4周后进行骨性关节炎指数the Western Ontario and Mc Maste universities（WOMAC）评分,统计治疗效果,并于治疗后3个月随访1次。结果：治疗4周及随访3个月时观察组较对照组疼痛、僵硬、功能障碍评分均明显下降（均P〈0.05）。4周后观察组有效率为91.6%,对照组有效率为72.2%,观察组有效率明显优于对照组（P〈0.05）;3个月随访时观察组有效率为88.8%,对照组有效率为69.4%,观察组有效率明显优于对照组（P〈0.05）。结论：中医特色二联疗法可提高膝骨性关节炎患者临床疗效,有效改善关节功能。
基金This research was supported by National Natural Science Foundation of China(Grant No.61976064)Project of National Defense Science and Technology Innovation Zone(Grant No.18-H863-01-ZT-005-027-02)+1 种基金Equipment Pre-Research Key Laboratory Fund Project(61421030203)Zhijiang International Young Talent Scheme(2019).
文摘The domain name system(DNS)provides a mapping service between memorable names and numerical internet protocol addresses,and it is a critical infrastructure of the Internet.The authenticity of DNS resolution results is crucial for ensuring the accessibility of Internet services.Hundreds of supplementary specifications of protocols have been proposed to compensate for the security flaws of DNS.However,DNS security incidents still occur frequently.Although DNS is a distributed system,for a specified domain name,only authorized authoritative servers can resolve it.Other servers must obtain the resolution result through a recursive or iterative resolving procedure,which renders DNS vulnerable to various attacks,such as DNS cache poisoning and distributed denial of service(DDoS)attacks.This paper proposes a novel decentralized architecture for a DNS data plane,which is called Blockzone.First,Blockzone utilizes novel mechanisms,which include on-chain authorization and off-chain storage,to implement a decentralized and trustworthy DNS data plane.Second,in contrast to the hierarchical authentication and recursive query of traditional DNS,Blockzone implements a decentralized operation model.This model significantly increases the efficiency of domain name resolution and verification and enhances the security of DNS against DDoS and cache poisoning attacks.In addition,Blockzone is fully compatible with the traditional DNS implementation and can be incrementally deployed as a plug-in service of DNS without changing the DNS protocol or system architecture.The Blockzone scheme can also be generalized to address security issues in other areas,such as the Internet of things and edge computing.
基金This study is supported by the Key Project of the National Natural ScienceFoundation of China(Grant No.72132001).
文摘Owing to the heterogeneity between functional units and resource scarcity,manufacturing firms have been struggling with intra-organizational coordination for productivity and innovation.Traditional organizational structures,such as linear-functional and matrix,may cause responsibility division and independent goals(Shahani,2020),and are more difficult to be adopted by large-sized innovative manufacturing firms for quantity production.This is based on a review of several new forms of organization(i.e.,network organization,multiteam system,and platform organization)compared with the traditional forms of organization(i.e.,linear,matrix,and business unit organization,among others).This study proposes a three-dimensional(3D)magic-cube organizational structure,considering the product dimensions,business,and administration.Moreover,the characteristics,propositions of system operation,system dynamic model,and working model of the 3D magic-cube organization are described.Finally,the 3D model is applied in a Chinese manufacturing firm to test its effectiveness.By redesigning the post and pay system,the pilot organization establishes a project-driven and cross-functional coordination mechanism,positively affecting the firm’s financial profit,output value,labor productivity,and income of per capita.The proposed 3D model can be adopted by large-or medium-sized manufacturing firms for product development and innovation.The implications of both practice and theory are also discussed in this study.
文摘Surface integrity is the major factor impacting on the operation quality, service life and reliability of the aeroengine components. The surface integrity of aeroengine component is damaged by the failures such as crack,deformation, oxidation, corrosion, erosion, and microstructural degeneration. It adopts advanced remanufacturing technologies to restore or improve the surface integrity and regenerate these high value parts. This paper firstly puts forward the concept, namely surface integrity remanufacturing for aeroengine components, and its connotation. The key remanufacturing technologies have been developed to repair the components with surface damages. Ultimately, some application examples of surface integrity remanufacturing technologies as well as their effects in aeroengine maintenance are introduced. The discarded components have been reused and their service lives have been extended and their reliability has been increased by implementing surface integrity remanufacturing. It has realized "The Repaired Components Outpacing the New Ones", material saving, energy saving, and emission reduction.
文摘The paper puts forward the idea of problembased engineering management, expounds its connotation and guiding ideology and moreover, substantially demonstrates its practical significance in the engineering management system for the maintenance of Chinese military aircraft engines.
