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1.
基于网络DEA模型和Malmquist指数模型,利用浙江省11个地级市的2011-2020年的数据,以降维后的污染指数为非期望产出对绿色技术创新效率进行测度和分析。发现:浙江各市总体上成果转化阶段的效率优于研发阶段,城市间发展差异较大;整体TFP指数均值为1.121,其提升主要源自技术进步;城镇化水平、产业结构优化、对外开放、政府干预和研发强度对绿色技术创新效率有促进作用,但经济发展水平与绿色技术创新效率的U型关系不显著。  相似文献   
2.
《Long Range Planning》2022,55(4):102125
Strategy process and practice research has illuminated the internal dynamics of strategy work – at the cost of backgrounding processes and practices that relate to engagement with external actors. In this conceptual paper, we argue for an extension of this body of work by shifting the focus of research from internal practices and processes towards externally oriented practices of engagement. We do so by critically building on the military strategy literature and develop the concept of strategy as engagement. This concept suggests understanding the role of strategy as bridge between policy and tactics; the importance of grand strategy as the making of policy; and the need to focus attention on tactics as distributed collective action. Thus, we contribute to strategy process and practice research through 1) extending its repertoire to practices of engagement and 2) broadening its epistemic foundation through a critical reading of military strategy.  相似文献   
3.
Acquisition and divestiture studies remain surprisingly disconnected, although both fields address corporate restructuring modes that are tightly linked. Acquisitions entail buying a business that another company divests or even, in many cases, a subsequent sale of formerly acquired activities. In this paper, we adopt a seller perspective, explore cross-fertilization areas, and identify important complementary and challenging insights that divesture research can bring to acquisition research. Focusing on sell-off, a major divesture type that is considered symmetrical to an acquisition, we discuss how divestiture research can shed novel light on pre- and post-acquisition stakeholders and processes. We propose two ways in which a divestiture perspective invites rethinking: 1) regarding actors, by stressing the need to consider triadic (divester–target–acquirer) rather than dyadic configurations (target–acquirer) and 2) regarding processes and time, by enlarging the temporal horizon of acquisition processes by divestiture processes, which precede but also sometimes exceed the acquisition. We contribute to acquisition research by providing a fresh look at stakeholder and process perspectives and identifying important future research avenues.  相似文献   
4.
在《制造绿金》一书中,弗里德兰运用马克思主义的劳动过程理论,以美国生菜产业为例探索新技术应用的社会过程与社会条件,突出强调了“劳动者生产组织”命题对一项新技术采用的重要作用。同时有关作物结构的分析为商品系统分析方法的提出以及世界商品链、食品体系研究奠定了基础,这不仅拓展了农业社会学研究的边界,也为中国农业社会学研究提供了重要的借鉴意义。  相似文献   
5.
蒲松  夏嫦 《中国管理科学》2021,29(5):166-172
城市医疗废弃物日益增加,且回收需求量受诸多因素的影响,难以准确预测,假定回收需求为确定值的医疗废弃物网络优化设计不能与实际需求相匹配。本文考虑了离散随机参数环境下,医疗回收网络设计中选址规划、分配计划及运输规划的协同优化问题,建立了以选址成本、运输成本最小为目标,设施与车辆能力限制为约束的二阶段随机规划模型。根据模型特点,设计了基于Benders decomposition的求解算法,同时,设计了一系列加速技术用于提高算法的求解效率。最后,以国内某城市医疗回收网络为背景设计算例,检验本文模型和求解策略的可行性和有效性。结果表明:相比确定性规划,随机规划的解能够节约总成本,结合一系列加速技术的Benders decomposition方法比CPLEX与纯的Benders decomposition更有优势。  相似文献   
6.
This paper shows that the term structure of conditional (i.e. predictive) distributions allows for closed form expression in a large family of (possibly higher order or infinite order) thinning‐based count processes such as INAR(p), INARCH(p), NBAR(p), and INGARCH(1,1). Such predictive distributions are currently often deemed intractable by the literature and existing approximation methods are usually time consuming and induce approximation errors. In this paper, we propose a Taylor's expansion algorithm for these predictive distributions, which is both exact and fast. Through extensive simulation exercises, we demonstrate its advantages with respect to existing methods in terms of the computational gain and/or precision.  相似文献   
7.
For many environmental processes, recent studies have shown that the dependence strength is decreasing when quantile levels increase. This implies that the popular max‐stable models are inadequate to capture the rate of joint tail decay, and to estimate joint extremal probabilities beyond observed levels. We here develop a more flexible modeling framework based on the class of max‐infinitely divisible processes, which extend max‐stable processes while retaining dependence properties that are natural for maxima. We propose two parametric constructions for max‐infinitely divisible models, which relax the max‐stability property but remain close to some popular max‐stable models obtained as special cases. The first model considers maxima over a finite, random number of independent observations, while the second model generalizes the spectral representation of max‐stable processes. Inference is performed using a pairwise likelihood. We illustrate the benefits of our new modeling framework on Dutch wind gust maxima calculated over different time units. Results strongly suggest that our proposed models outperform other natural models, such as the Student‐t copula process and its max‐stable limit, even for large block sizes.  相似文献   
8.
We apply the Abramson principle to define adaptive kernel estimators for the intensity function of a spatial point process. We derive asymptotic expansions for the bias and variance under the regime that n independent copies of a simple point process in Euclidean space are superposed. The method is illustrated by means of a simple example and applied to tornado data.  相似文献   
9.
The conditional intensity function of a spatial point process describes how the probability that a point of the process occurs ‘at’ a particular point in its carrier space depends on the realisation of the process in the remainder of the carrier space. Provided that the point process is simple, the conditional intensity determines all of the properties of the process, in particular its likelihood function. In this paper, we review the use of the conditional intensity function in the formulation of point process models and in making inferences from point process data, giving separate consideration to temporal, spatial and spatiotemporal settings. We argue that the conditional intensity function should take centre-stage in spatiotemporal point process modelling and analysis.  相似文献   
10.
乡村生态养老是指老年人在良好的生态环境下,能够满足自身养老需求,实现生理和心理健康的一种积极养老方式。文章在乡村振兴视角下从乡村自然环境、乡村基础设施、乡村养老环境和乡村养老政策四个维度构建了乡村生态养老评价体系,运用直觉模糊层次分析法计算指标权重,研究发现:乡村养老政策占据重要地位,旅游景点条件、网络通讯设施、医疗条件、税收减免政策等指标权重较高。基于此,分别从宏观层面、中观层面和微观层面提出了相应的策略。  相似文献   
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