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人-机交互 1

力学 1

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普尔钦斑 1

视线追踪 1

钱学森 1

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Challenges and opportunities in improving left ventricular remodelling and clinical outcome following surgical and trans-catheter aortic valve replacement

《医学前沿（英文）》 2021年 第15卷 第3期   页码 416-437 doi: 10.1007/s11684-021-0852-7

摘要： Over the last half century, surgical aortic valve replacement (SAVR) has evolved to offer a durable and efficient valve haemodynamically, with low procedural complications that allows favourable remodelling of left ventricular (LV) structure and function. The latter has become more challenging among elderly patients, particularly following trans-catheter aortic valve implantation (TAVI). Precise understanding of myocardial adaptation to pressure and volume overloading and its responses to valve surgery requires comprehensive assessments from aortic valve energy loss, valvular-vascular impedance to myocardial activation, force-velocity relationship, and myocardial strain. LV hypertrophy and myocardial fibrosis remains as the structural and morphological focus in this endeavour. Early intervention in asymptomatic aortic stenosis or regurgitation along with individualised management of hypertension and atrial fibrillation is likely to improve patient outcome. Physiological pacing via the His-Purkinje system for conduction abnormalities, further reduction in para-valvular aortic regurgitation along with therapy of angiotensin receptor blockade will improve patient outcome by facilitating hypertrophy regression, LV coordinate contraction, and global vascular function. TAVI leaflet thromboses require anticoagulation while impaired access to coronary ostia risks future TAVI-in-TAVI or coronary interventions. Until comparable long-term durability and the resolution of TAVI related complications become available, SAVR remains the first choice for lower risk younger patients.

关键词： surgical aortic valve replacement     trans-catheter aortic valve implantation     left ventricular hypertrophy and fibrosis     myocardial force-velocity relationship     His-Purkinje pacing     renin-angiotensin system inhibitors     coronary access impairment    

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Understanding innovation diffusion and adoption strategies in megaproject networks through a fuzzy system dynamic model

Yan ZHANG, His-Hsien WEI, Dong ZHAO, Yilong HAN, Jiayu CHEN

《工程管理前沿（英文）》 2021年 第8卷 第1期   页码 32-47 doi: 10.1007/s42524-019-0082-8

摘要： Innovation and knowledge diffusion in megaprojects is one of the most complicated issues in project management. Compared with conventional projects, megaprojects typically entail large-scale investments, long construction periods, and conflicting stakeholder interests, which result in a distinctive pattern of innovation diffusion. However, traditional investigation of innovation diffusion relies on subjective feedback from experts and frequently neglects inter-organizational knowledge creation, which frequently emerges in megaprojects. Therefore, this study adopted project network theory and modeled innovation diffusion in megaprojects as intra- and inter-organizational learning processes. In addition, system dynamics and fuzzy systems were combined to interpret experts’ subject options as quantitative coefficients of the project network model. This integrated model will assist in developing an insightful understanding of the mechanisms of innovation diffusion in megaprojects. Three typical network structures, namely, a traditional megaproject procurement organization (TMO), the environ megaproject organization (EMO), and an integrated megaproject organization (IMO), were examined under six management scenarios to verify the proposed analytic paradigm. Assessment of project network productivity suggested that the projectivity of the TMO was insensitive to technical and administrative innovations, the EMO could achieve substantial improvement from technical innovations, and the IMO trended incompatibly with administrative innovations. Thus, industry practitioners and project managers can design and reform agile project coordination by using the proposed quantitative model to encourage innovation adoption and reduce productivity loss at the start of newly established collaborations.

关键词： megaproject     innovation adoption     project network     system dynamic     fuzzy logic    

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钱学森与力学

谈庆明

《中国工程科学》 2001年 第3卷 第10期   页码 1-6

摘要：

介绍了钱学森先生在近代力学和技术科学发展中的贡献，特别是介绍了他为实现超声速飞行和火箭技术在一系列关键问题上所做的贡献。在研究过程中他不断开创出工程控制论、物理力学和喷气推进学等新的技术科学，从而促进了航空航天技术的飞跃发展。我们要学习体现在他身上的超前意识和务实精神，学习、理解并大力开展他所倡导的技术科学的研究工作。

关键词： 钱学森     力学     技术科学    

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基于双光源的实时视线追踪系统

黄莹,王志良,戚颖

《中国工程科学》 2008年 第10卷 第2期   页码 86-90

摘要：

介绍了一个非穿戴式的低成本视线追踪系统。采用双近红外光源照射，单CCD相机获取信息的系统结构。并采用独特的双眼参数综合利用的方法来获取视线方向参数，使视线方向追踪效果更加稳定，并且同时扩大了有效追踪范围。此外，在视线方向参数获取、分析的过程中采用了一套快速算法使系统能满足实时性的要求。应用实例表明，该系统在人-机交互领域的应用已有了初步成效。

关键词： 人-机交互     视线追踪     普尔钦斑    

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标题 作者 时间 类型 操作

Challenges and opportunities in improving left ventricular remodelling and clinical outcome following surgical and trans-catheter aortic valve replacement

期刊论文

Understanding innovation diffusion and adoption strategies in megaproject networks through a fuzzy system dynamic model

Yan ZHANG, His-Hsien WEI, Dong ZHAO, Yilong HAN, Jiayu CHEN

期刊论文

钱学森与力学

谈庆明

期刊论文

基于双光源的实时视线追踪系统

黄莹,王志良,戚颖

期刊论文