基于陆域和空域运输系统的空港可达性评价方法研究

空港可达性可分为陆域可达性和空域可达性两部分进行计量,前者评价可知乘客访问空港的便利程度,后者评价空港为乘客提供前往目的地从事活动的便利性和丰富程度.选取全国141家空港为评价对象,基于SAGA GIS平台建立空港的陆域运输网络,根据航班信息构建空港的空域航空时空服务网络,再计算空港的陆域和空域可达性,然后比较及分析各空港可达性在空间和时间上的分布特征.研究认为,评价方法有助于规划建设者或运营管理者充分认识空港的区位选址与航空系统资源的特性,保证机场选址和运营管理方案的科学有效性.     

基于社会网络分析的高校科技成果转化团队知识网络研究——以南昌大学江风益团队为例

以南昌大学江风益团队为例,采用社会网络分析方法对高校科技成果转化团队的知识网络进行建模和分析。通过节点中心性测度和凝聚子群分析,研究了江风益高校科技成果转化团队知识网络的节点重要性和派系结构。结论如下:该团队的核心成员在团队知识网络中起着主导知识协作关系和引导知识协作行为的关键作用;该团队的知识网络中存在7个派系,其中绝大多数派系由核心成员主导,这反映出该团队具有高度凝聚性。最后,从发展关键节点、连接孤立节点和促进知识团体三个方面提出了进一步优化团队知识网络的建议。     

网络公司价值评估方法的比较研究

网络的出现改变了人们生活和工作的方式,也为这个社会带来了巨大的商机。随着网络公司如雨后春笋般的出现以及网络股在市场中的表现,评估师们面临这样一个问题：如何评估网络公司的价值？网络公司作为一种新的组织形式,在运用传统的价值评估方法对网络公司进行价值评估时遇到了瓶颈。如何正确地看待网络公司的价值这一问题,亟待解决。     

Exploring the predictability of range‐based volatility estimators using recurrent neural networks

We investigate the predictability of several range‐based stock volatility estimates and compare them with the standard close‐to‐close estimate, which is most commonly acknowledged as the volatility. The patterns of volatility changes are analysed using long short‐term memory recurrent neural networks, which are a state‐of‐the‐art method of sequence learning. We implement the analysis on all current constituents of the Dow Jones Industrial Average index and report averaged evaluation results. We find that the direction of changes in the values of range‐based estimates are more predictable than that of the estimate from daily closing values only.     

基于WEB的网络管理技术的研究与实现

随着计算机技术和通信技术的发展,计算机网络已经渗透到社会及经济生活的各个领域。网络用户和数据流量的急剧增长,给网络管理带来很大的压力和难度。基于Web的网络管理技术凭借其优势能更好满足网络管理需求,也能使网络管理更加方便和快捷。本文主要从基于Web的网络管理技术的概况、Web网络管理技术的主要功能等方面,对基于Web的网络管理技术及实现进行分析。     

顺应潮流的轴辐式物流网络

详细分析了轴辐式物流网络的形式、优缺点，并介绍了设计轴辐式物流网络的基本内容与方法。     

Effectiveness and safety of betrixaban extended prophylaxis for venous thromboembolism compared with standard-duration prophylaxis intervention in acute medically ill patients: a systematic literature review and network meta-analysis

Abstract

Aims: To determine the clinical effectiveness and safety of venous thromboembolism (VTE) prophylaxis using US- and Europe-approved anticoagulants relative to extended-duration VTE prophylaxis with betrixaban. Low molecular weight heparins (LMWHs), unfractionated heparin (UFH), fondaparinux sodium and placebo were each compared to betrixaban, as standard-duration VTE prophylaxis for hospitalized, non-surgical patients with acute medical illness at risk of VTE.

Materials and methods: A systematic literature review was conducted up to June 2019 to identify randomized controlled trials (RCTs) of VTE prophylaxis in hospitalized, non-surgical patients with acute medical illness at risk of VTE. Studies that reported the occurrence of VTE events (including death) and, where possible, major bleeding, from treatment initiation to 20–50?days thereafter were retrieved and extracted. A Bayesian fixed effect network meta-analysis was used to estimate efficacy and safety of betrixaban compared with standard-duration VTE prophylaxis.

Results: Seven RCTs were analyzed which compared betrixaban, LMWHs, UFH, fondaparinux sodium, or placebo. There were significantly higher odds (median odds [95% credible interval]) of VTE with LMWHs (1.38 [1.12–1.70]), UFH (1.60 [1.05–2.46]), and placebo (2.37 [1.55–3.66]) compared with betrixaban. There were significantly higher odds of VTE-related death with placebo (7.76 [2.14–34.40]) compared with betrixaban. No significant differences were observed for the odds of major bleeding with all comparators, VTE-related death with any active standard-duration VTE prophylaxis, or of VTE with fondaparinux sodium, compared with betrixaban.

Limitations and conclusions: In this indirect comparison, betrixaban was shown to be an effective regimen with relative benefits compared with LMWHs and UFH. This indicates that betrixaban could reduce the burden of VTE in at-risk hospitalized patients with acute medical illness who need extended prophylaxis, though without direct comparative evidence, stronger conclusions cannot be drawn.     

The Organizational Innovation System: A systemic framework for radical innovation at the organizational level

Most research on innovation management at the organizational level has typically been focused on one specific innovation project phase or innovation management concept. This has resulted in many valuable insights, though scattered in different (innovation) research fields and studies. With the development of the Organizational Innovation System (OIS), we bring together important insights from the Innovation Systems, Open Innovation and other related fields into a guiding concept useful for both innovation managers developing (radical) innovations and innovation scholars. In this paper, we define the OIS and its key structural components, and discuss the identified functions and categories of potential imperfections. With the OIS, we provide a holistic, hands-on concept currently lacking in the open innovation approach. From the conceptualization, a framework for analysis is put forward which provides structure to the study of ongoing and finished innovation processes. Additionally, the development of the OIS is a first step in the development of a currently underdeveloped micro-level within the innovation systems perspective. The insights in OISs and the future insights derived from analytical efforts, will not only be beneficial for the performance of innovating organizations and organizational innovation systems but also for the performance of the higher, interconnected system levels.     

中国省际经济增长的空间关联网络结构--基于非线性Granger因果检验方法的再考察

文章基于经济增长空间传导的非线性趋势,利用最新发展起来的非线性Granger因果检验技术,对中国省际经济增长的空间溢出关系进行了识别,并在社会网络分析框架下揭示了其网络结构特征。研究发现：（1）线性 Granger因果检验方法严重低估了中国省际经济增长的空间关联性,而采用非线性Granger因果检验方法不仅可以揭示出更多的空间关联关系,而且能够识别出更多可能的空间溢出渠道,这为提升中国经济增长的空间协同效应提供了更多的实证支持。（2）中国省际经济增长从整体上呈现出更紧密的、更稳定的网络结构形态,在中国省际经济增长的最大可能性网络（ML-Network）中没有任何一个省份能够“孤立”于整体网络。“不谋全局者,不能谋一域”,必须从全局的、整体的视角重新审视中国区域经济的协调发展,探寻并创造出更多的空间溢出渠道,发挥经济增长不同板块的不同功能,实现区域经济空间的协同发展。     

GIS在配网管理系统中的应用

本文阐述一种基于GIS的配电网用电管理系统的设计方法。该系统将GIS与配电网用电管理相结合,用于管理与其地理位置相关的配电网设备信息和供电用户信息。所开发的应用管理信息系统含有配电网中的各种运行数据的浏览、查询、分析、统计、汇总及综合报表等功能。