Search practices in the early phase of the innovation process and ambidexterity: testing a sample of high-tech companies

This paper investigates the relationship between the practices put in place by firms to search for local and distant knowledge, ambidexterity and firms’ performances; attention is then focused on analysing the antecedents and consequences of ambidexterity in the search phase of the innovation process. Structural equation modelling has been used in order to test these hypotheses in a sample of Italian high-tech companies. Results of the study show a positive impact of the practices used by firm to search for distant knowledge on both ambidexterity and firms’ performances as well. Implications of these results are discussed in the paper.     

Development of a national competitiveness index based on a structural equation model

In this paper, we propose a national competitiveness index using raw Institute of Management Development (IMD) data and try to overcome a shortcoming in the IMD's own ranking system. The IMD world competitiveness ranking considers 20 factors to define an index, but it does not consider the structural relationships among various factors. We utilise a structural equation model to derive a national competitiveness index that reflects such structural relationships. We then reveal new rankings of world competitiveness. In addition, we conducted a comparison analysis by economy level and identified improvement points in terms of measurement variables as well as latent variables. Our work is expected to promote a new era of national competitiveness rankings and indices.     

信息物理融合系统软件可信性演化动力学建模

信息物理融合系统(CPS)软件可信性建模是CPS可信软件开发过程中至关重要的一环,现有的形式化方法、软件验证技术并不适合对CPS软件可信性动态演化进行描述和分析。在深入分析CPS可信软件动态演化过程的基础上,结合非线性动力学的基本理论和方法,研究CPS软件可信性演化的动力学机制,对CPS软件在内外双重因素影响下的可信性演化过程进行建模,并分析其可信性演化规律,为CPS软件可信性研究提供了一种新手段。通过对一个工业控制领域中CPS软件的建模与分析,验证了该方法的可行性。     

机载防撞系统干扰限制功能的设计与实现

针对机载防撞系统(TCAS)空对空通信时存在的同步混扰,采用飞机分布因子结合问询功率和问询速率的控制方法,建立了干扰限制的数学模型,给出了TCAS监视功能干扰限制的设计流程。按照DO-185B标准定义的高密度飞机分布环境,采用计算机仿真得到了TCAS干扰限制功能在高密度空域中统计性能,对不同监视区域中TCAS应答机的占用率与DO-185B的设计需求进行比较,验证了设计的干扰限制功能的有效性和实用性。仿真结果表明干扰限制算法能够满足高密度空域中TCAS监视功能的要求,在TCAS干扰限制功能的设计和性能评估方面具有实际应用价值。     

How to make Dupire’s local volatility work with jumps

There are several (mathematical) reasons why Dupire’s formula fails in the non-diffusion setting. And yet, in practice, ad-hoc preconditioning of the option data works reasonably well. In this note, we attempt to explain why. In particular, we propose a regularization procedure of the option data so that Dupire’s local vol diffusion process recreates the correct option prices, even in manifest presence of jumps.     

“互联网+”生态旅游产品价值实现机制研究——以南山国家公园线路为例

在大力探索生态产品价值实现背景下,生态旅游作为公共产品,为推动生态产品价值实现和中国特色生态文明建设新模式的形成提供有力支撑。本研究选取南山国家公园线路为案例,以S-O-R理论为基础,构建生态旅游产品购买意愿模型,探究生态旅游产品在微信朋友圈购买意愿的内在机制。研究发现：（1）生态旅游产品在微信朋友圈的购买意愿存在“营销媒体特征—感知功利价值—购买意愿”和“社交媒体特征—感知享乐价值—购买意愿”两种形成机制;（2）生态旅游产品在微信朋友圈的购买意愿同时受到功利性因素和享乐性因素的影响,但功利性因素的影响占主导作用;（3）生态旅游产品的价格和产品图片的美观性对感知功利价值的影响较强;（4）微信朋友圈的社交存在感和微信好友的能力对感知享乐价值的影响较强;（5）不同人口学特征下,被调查者的购买意愿有显著差异。建议开展组合式营销、改善营销信息的内容和质量、保持高度的用户粘性、重视“专业形象”打造、针对主要客源市场“有的放矢”营销等实践,以促进南山国家公园生态旅游产品的价值实现。     

北京市种植业“一村一品”村农业产业竞争力研究

以北京市58个种植业“一村一品”村为研究对象,选取种植业“一村一品”村农业产业相关指标。首先,通过因子分析将筛选出的投入方面与产出方面原始评价指标分别进行降维处理,从而构建简化且合理的评价指标。其次,运用组合赋权超效率DEA模型,对种植业“一村一品”村农业产业效率值进行评价分析。最后,运用ESDA模型分析空间因素对“一村一品”村农业产业竞争力的影响,研究其农业产业竞争力是否存在空间相关性,探索种植业“一村一品”村农业产业竞争力在空间分布格局上的联系。结果表明：种植业“一村一品”村农业产业竞争力整体较强,但村间差异较大;农业产业竞争力具有空间相关性,存在集聚效应。据此,提出培育新型经营主体、选准高质量特色产业、协调各区域内互补发展、加强跨区域科技合作交流等建议,推动北京市种植业“一村一品”村农业产业竞争力提升。     

Identifying crime generators and spatially overlapping high-risk areas through a nonlinear model: A comparison between three cities of the Valencian region (Spain)

The behavior and spatial distribution of crime events can be explained through the characterization of an area in terms of its demography, socioeconomy, and built environment. In particular, recent studies on the incidence of crime in a city have focused on the identification of features of the built environment (specific places or facilities) that may increase crime risk within a certain radius. However, it is hard to identify environmental characteristics that consistently explain crime occurrence across cities and crime types. This article focuses on the assessment of the effect that certain types of places have on the incidence of property crime, robbery, and vandalism in three cities of the Valencian region (Spain): Alicante, Castellon, and Valencia. A nonlinear effects model is used to identify such places and to construct a risk map over the three cities considering the three crime types under research. The results obtained suggest that there are remarkable differences across cities and crime types in terms of the types of places associated with crime outcomes. The identification of high-risk areas allows verifying that crime is highly concentrated, and also that there is a high level of spatial overlap between the high-risk areas corresponding to different crime types.     

保障功能分化：中国共产党对职业福利的认知与实践逻辑

职业福利是社会保障体系的重要组成部分,中国共产党在综合判断社会、经济发展阶段性特征以及基本社会保障体系构建完成度和保障水平的基础上,对职业福利的认知与实践沿着保障功能分化的逻辑,阶段性、多维度地推进和深化。从建党到计划经济时期,中国共产党将职业福利与公共福利混合为一体来推进,之后在市场经济条件下实现了两者保障功能定位的分化并明确了职业福利的补充保障功能;进而在基本社会保障制度构建完成的基础上,推动职业福利保障功能从微弱补充到实质补充的层次分化;同时协调推进公私部门间的职业保障功能分化进程,从公私分立到公私“可比较”。最终通过对职业保障功能分化的推进,建构起更加可持续的社会保障体系,满足人民对美好生活的需要。     

中小微集成电路设计企业成本核算的优化方法探讨

近年来,企业之间的竞争日趋激烈,企业要想获得长远发展,除了需要不断地开发新产品来创造更多的价值,还需要有效控制企业各个环节的经营成本。论文对目前大部分中小微集成电路设计企业在材料成本核算与产品成本核算方面存在的问题进行了探讨,重点分析了材料流转各环节与各类成本核算方法存在的问题,对存货流转环节的成本核算与产成品的成本核算的优化对策进行了探讨,以期为中小微集成电路设计企业高质量开展存货流转环节的成本核算与产成品的成本核算提供帮助。