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1.
Ecosystems are formed by organisations that jointly create a value proposition that a single firm could not create in isolation. To deliver this value proposition, the partners need a focal firm, the orchestrator, to be align them towards the joint value proposition. Thus, how orchestrators design the alignment structure of an ecosystem is at the very heart of the ecosystem concept – yet it has not been sufficiently addressed by extant research. This is all the more true for the question of how the design of an ecosystem is shaped depending on surrounding conditions. This paper applies a qualitative study with ten cases and, based on the attention-based view of the firm, contributes to research on ecosystems in several ways. First, it explains which ecosystem designs are beneficial under which conditions. Second, it elucidates the structure and activities within ecosystems and shows that start-ups can be just as good ecosystem orchestrators as incumbents. Third, it explains the circumstances under which single vs. multi orchestrator ecosystems occur. Fourth, it presents the conditions when incumbents or start-ups make better orchestrators. Finally, it is among the first studies to apply the attention-based view to business ecosystems, and shows that doing so yields intriguing insights into this emerging field of research.  相似文献   
2.
以高中生为被试对象,以大陆漂移论为素材,研究外部视觉情绪设计对多媒体学习的影响。结果表明,接受情绪设计组(实验组)的积极情绪显著高于中性组(对照组);实验组与对照组内在认知负荷、相关认知负荷均无显著差异,外在认知负荷小于对照组;实验组保持测验成绩显著高于对照组,迁移测验成绩无差异。同时,外部视觉情绪设计能显著提高多媒体学习效果。外部视觉情绪设计的实验设计突破了已有研究300s学习素材的诱发时间,拓展了多媒体学习情绪设计的内涵。  相似文献   
3.
BackgroundSupporting women to continue breastfeeding is a global challenge. The Milky Way Program is an effective face to face intervention to increase breastfeeding rates up to six months postpartum. The sustainability and access to the Milky Way Program could be enhanced by transforming it into a mobile application allowing women to access relevant information from their own place at a convenient time.AimTo explore the process of transforming the Milky Way Program into an acceptable and usable mobile health application.MethodStakeholders including multidisciplinary researchers and end-users designed the application based on the Milky Way Program by using Persuasive System Design principles. A mixed-method approach was used in the development and evaluation process. Seven women were recruited through convenience sampling to pilot test the application. The women’s feedback was collected through an online survey six weeks after birth and individual interviews at four months postpartum.FindingsWomen in the pilot study reported that the breastfeeding application was well designed, easy to use, interactive, reassuring and evidence-based with credible sources of information.ConclusionThe Persuasive System Design model combined with end-user engagement can feasibly inform the development of an acceptable and usable mobile health application for breastfeeding based on a proven clinical intervention. Further rigorous testing is required to evaluate the effectiveness of the application on breastfeeding initiation and duration.  相似文献   
4.
ABSTRACT

Correlated bilateral data arise from stratified studies involving paired body organs in a subject. When it is desirable to conduct inference on the scale of risk difference, one needs first to assess the assumption of homogeneity in risk differences across strata. For testing homogeneity of risk differences, we herein propose eight methods derived respectively from weighted-least-squares (WLS), the Mantel-Haenszel (MH) estimator, the WLS method in combination with inverse hyperbolic tangent transformation, and the test statistics based on their log-transformation, the modified Score test statistic and Likelihood ratio test statistic. Simulation results showed that four of the tests perform well in general, with the tests based on the WLS method and inverse hyperbolic tangent transformation always performing satisfactorily even under small sample size designs. The methods are illustrated with a dataset.  相似文献   
5.
Strong orthogonal arrays (SOAs) were recently introduced and studied as a class of space‐filling designs for computer experiments. An important problem that has not been addressed in the literature is that of design selection for such arrays. In this article, we conduct a systematic investigation into this problem, and we focus on the most useful SOA(n,m,4,2 + )s and SOA(n,m,4,2)s. This article first addresses the problem of design selection for SOAs of strength 2+ by examining their three‐dimensional projections. Both theoretical and computational results are presented. When SOAs of strength 2+ do not exist, we formulate a general framework for the selection of SOAs of strength 2 by looking at their two‐dimensional projections. The approach is fruitful, as it is applicable when SOAs of strength 2+ do not exist and it gives rise to them when they do. The Canadian Journal of Statistics 47: 302–314; 2019 © 2019 Statistical Society of Canada  相似文献   
6.
文章运用实地考察法、文献搜集法,从公共艺术特性入手,通过南京牛首山佛顶宫的文脉、空间及其内外的装置以及人们在这样的宗教建筑环境中进行有关活动的分析研究,寻找公共艺术作品与场所的契合点。通过对契合点的阐释,希望对中国建筑艺术作品的公共艺术与场所精神研究提供一点参考,以期日后创作出更加成功的公共艺术与场所精神相结合的案例。  相似文献   
7.
电子认证是保障网络及信息安全的重要手段。通过对河北省电子认证工作现状、取得的成绩和存在问题进行深入剖析,提出创新政府监管,加强人力、物力投入,鼓励开展跨省、跨境互认,推动电子认证服务创新升级,开展跨地区、跨行业电子认证协同,共建全国性密码与密钥基础设施等发展建议。  相似文献   
8.
The case-cohort design is widely used as a means of reducing the cost in large cohort studies, especially when the disease rate is low and covariate measurements may be expensive, and has been discussed by many authors. In this paper, we discuss regression analysis of case-cohort studies that produce interval-censored failure time with dependent censoring, a situation for which there does not seem to exist an established approach. For inference, a sieve inverse probability weighting estimation procedure is developed with the use of Bernstein polynomials to approximate the unknown baseline cumulative hazard functions. The proposed estimators are shown to be consistent and the asymptotic normality of the resulting regression parameter estimators is established. A simulation study is conducted to assess the finite sample properties of the proposed approach and indicates that it works well in practical situations. The proposed method is applied to an HIV/AIDS case-cohort study that motivated this investigation.  相似文献   
9.
通过对抗性设计方法解决项目评审中的社会伦理问题,为专家、申请者、大众提供争论和表达异议的民主环境。项目自动评价平台完成民主环境的构建,呈现专家、申请者、平台的争胜性关系,揭示霸权,旨在重塑自由、平等、公平、正义、特权等的项目评审中的社会伦理。  相似文献   
10.
公共艺术与城市文化两者的关系十分密切,在城市整体形象建设中结合城市规划与建筑设计,注重公共艺术整体性设计,在城市公共空间与环境建设中融入公共艺术,能够实现城市历史与文化的良好传承,并将城市公共活动空间所具有的地域文化特色充分发挥。旨在对城市文化视角下的公共艺术整体性设计展开深入研究,并从整体性设计的城市文化、规划、建筑等多个层面进行深度解析。  相似文献   
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