政府干预、资本投向与结构效率

基于不同投资形态对经济、社会与政治目标的贡献差异,研究了政府干预下的资本投向选择效应,及其导致的投资结构异化对总体效率的影响.研究发现,(1)地方政府有动机干预国企增加固定资产、股权并购和垄断资产投资,削减技术资产投资.(2)在政府干预程度较大的地区,国资委直属企业的固定资产投资规模和增速最大;企业集团所属企业的股权投...     

并行工程产品开发过程定量化建模与计划制订

由于现有的一些并行工程定量化模型中修改设计微循环的细节特征描述得还不够充分 ,本文提出了一种新的基于产品 -工艺设计活动对网络的定量化模型来描述并行工程产品开发过程 ,并且给出了产品 -工艺设计活动对平均持续时间与产品或工艺设计活动资源占用率的计算方法 .在此基础上 ,将并行工程产品开发过程的计划制订问题建模成一个有资源约束的项目调度问题 .与其它此类问题不同的是 ,在本文中 ,分配给产品开发项目的各类资源的数量不是事先给定的 ,而是与最优产品开发计划一起获得的 ,所以这是一个资源分配与计划制订的集成优化问题 .本文提出了一种新的基于分枝定界的算法来解决此问题并引入一个启发式规则来提高算法的搜索效率     

基于工作流的企业业务过程集成建模方法

工作流管理是一种对业务过程进行支持、控制、监视和优化的先进工具. 将生产制造过程 BOM和Petri 网技术应用于企业业务过程,对于相关定义、建模分析以及从BOM到Petri 网的映 射实现算法进行了说明;对基于BOM- Petri 的建模方法进行了扩展优化;最后结合算法进行了 仿真研究.     

组织学习影响因素、学习能力与绩效关系的实证研究

回顾了国内外关于组织学习理论及组织学习与绩效关系方面的研究成果,基于中国201家企业调查数据,对采用定性方法提出的组织学习过程模型(6P-1B模型)进行了定量的实证研究.结果表明:6P-1B模型提出的7个方面的组织学习能力与组织绩效有紧密的正相关关系;各组织学习能力的机理要素与各组织学习能力之间有紧密的正相关关系;企业所感知的外界环境的变化程度不同、员工之间的目标正相关程度不同,使得企业在组织学习的机理要素方面的表现存在显著差异.这些研究结果对6P-1B模型的理论逻辑提供了一定的统计检验的支持,同时也给管理者提供了一些关于如何提高组织学习能力的方法和启示.     

Approximation to two independent Gaussian processes from a unique Lévy process and applications

Abstract

In this article, we construct two families of processes, from a unique Lévy process, the finite dimensional distributions of which converge in law towards the finite dimensional distributions of the two independent Gaussian processes. As applications of this result, we obtain families of processes that converge in law towards fractional Brownian motion, sub-fractional Brownian motion and bifractional Brownian motion, respectively.     

Inside co‐production: Stakeholder meaning and situated practice

Co‐production has risen to the fore of contemporary policymaking, with the intention of placing citizens at the heart of public service design and production. Although this may lead to more democratic and legitimate decision‐making, achieving “meaningful” co‐production can be difficult. In this qualitative study, we examine what constitutes meaningful co‐production, in particular asking whether there is a disconnect between the elite policy narrative that legitimizes co‐production and stakeholder experiences of this approach. Our research adopts a decentred approach to examine the different ways that actors understand and participate in co‐production, both as a methodology and as an interactive social practice. We conclude that a lack of synergy between local narratives may undermine the potential success of co‐production.     

Are persons with disabilities included in the Colombian peace process?

This article follows on from our previous one about the armed conflict in Colombia and its relationship with disability. We seek here to explore the ways in which people with disabilities are starting to be involved in the peace process with the Revolutionary Armed Forces of Colombia – People’s Army (FARC-EP), and the avenues there are for representative organizations of disabled people to have a louder voice in Colombia. Currently, while legal and human rights approaches are important, people with disabilities in Colombia do not generally have the resources to fight for their own rights. However, there could be opportunities in the negotiations currently with the National Liberation Army (ELN) to include a specific focus on the rights of people with disabilities.     

Negotiating who gives birth and the influence of fear of childbirth: Lesbians,bisexual women and transgender people in parenting relationships

BackgroundFear of childbirth (FOC) may affect family planning in lesbian, bisexual and transgender (LBT) couples with two potential carriers of a pregnancy. FOC has previously been researched in heterosexual women, while experiences of LBT people have remained unattended. The choice of birth-giving partner in same-sex couples has gained some attention in previous research, but the potential complexities of the decision have not been studied.AimThe aim is to explore how LBT people negotiate the question of who gives birth, in couples with two potential birth parents, and where one or both partners have a pronounced FOC.MethodsSeventeen self-identified LBT people were interviewed about their expectancies and experiences of pregnancy and childbirth. Data were analysed following a six-step thematic analysis.ResultsFOC was negotiated as one of many aspects that contributed to the decision of who would be the birth-giving partner. Several participants decided to become pregnant despite their fears, due to a desire to be the genetic parent. Others negotiated with their partner about who was least vulnerable, which led some of them to become pregnant despite FOC. Still other participants decided to refrain from pregnancy, due to FOC, and were delighted that their partner would give birth. Several participants described their partner's birth-giving as a traumatic experience for them, sometimes also when the birth did not require any obstetric interventions. The partner's experience was in some cases not addressed in postnatal care.ConclusionsIt is important that healthcare staff address both partners’ prenatal expectancies and postnatal experiences.     

Modelling columnarity of pyramidal cells in the human cerebral cortex

For modelling the location of pyramidal cells in the human cerebral cortex, we suggest a hierarchical point process in that exhibits anisotropy in the form of cylinders extending along the z-axis. The model consists first of a generalised shot noise Cox process for the xy-coordinates, providing cylindrical clusters, and next of a Markov random field model for the z-coordinates conditioned on the xy-coordinates, providing either repulsion, aggregation or both within specified areas of interaction. Several cases of these hierarchical point processes are fitted to two pyramidal cell data sets, and of these a final model allowing for both repulsion and attraction between the points seem adequate. We discuss how the final model relates to the so-called minicolumn hypothesis in neuroscience.     

Fractional approaches for the distribution of innovation sequence of INAR(1) processes

Abstract

In this paper, we present a fractional decomposition of the probability generating function of the innovation process of the first-order non-negative integer-valued autoregressive [INAR(1)] process to obtain the corresponding probability mass function. We also provide a comprehensive review of integer-valued time series models, based on the concept of thinning operators with geometric-type marginals. In particular, we develop two fractional approaches to obtain the distribution of innovation processes of the INAR(1) model and show that the distribution of the innovations sequence has geometric-type distribution. These approaches are discussed in detail and illustrated through a few examples.