我国盐业产业组织政策研究

产业组织政策的基本目标就是要促进产业实现有效竞争,我国盐业产业组织政策并没达到有效竞争的目标,长期处于"二元"产业组织结构。一方面"大工业盐"市场集中度较低,竞争过度,另一方面"食小盐"市场部门垄断严重,竞争缺失,导致产业组织效率低下。因此,当务之急,不仅要实行管制与竞争相兼容的盐业特许投标政策,还要出台规模经济与竞争活力相兼容的系列有效竞争政策——企业并购政策、经济规模政策和竞争活力政策,以促成金字塔形的产业组织体系,彰显各层次企业的规模经济,实现有效竞争,提高产业经济效率,进而提升我国盐业产业的国际竞争力。     

Cloud manufacturing system for sheet metal processing

Abstract

Cloud computing is changing the way industries and enterprises run their businesses. Cloud manufacturing is emerging as an approach to transform the traditional manufacturing business model, while helping the manufacturer to align production efficiency with its business strategy, and creating intelligent factory networks that enable collaboration across the whole enterprise. Many production planning and control (PPC) problems are essentially optimisation problems, where the objective is to develop a plan that meets the demand at minimum cost or maximum profit. Because the underlying optimisation problem will vary in the different business and operation phases, it is important to think about optimisation in a dynamic mechanism and in a number of interlinked sub-problems at the same time. Cloud manufacturing has the potential to offer decision support as a service and medium of communication in PPC. To solve these problems and produce collaboration across the supply chain, this paper provides an overview of the state of the art in cloud manufacturing and presents a model of cloud-based production planning and production system for sheet metal processing.     

Optimal Dynamic Order Scheduling under Capacity Constraints Given Demand‐Forecast Evolution

We consider a manufacturer without any frozen periods in production schedules so that it can dynamically update the schedules as the demand forecast evolves over time until the realization of actual demand. The manufacturer has a fixed production capacity in each production period, which impacts the time to start production as well as the production schedules. We develop a dynamic optimization model to analyze the optimal production schedules under capacity constraint and demand‐forecast updating. To model the evolution of demand forecasts, we use both additive and multiplicative versions of the martingale model of forecast evolution. We first derive expressions for the optimal base stock levels for a single‐product model. We find that manufacturers located near their market bases can realize most of their potential profits (i.e., profit made when the capacity is unlimited) by building a very limited amount of capacity. For moderate demand uncertainty, we also show that it is almost impossible for manufacturers to compensate for the increase in supply–demand mismatches resulting from long delivery lead times by increasing capacity, making lead‐time reduction a better alternative than capacity expansion. We then extend the model to a multi‐product case and derive expressions for the optimal production quantities for each product given a shared capacity constraint. Using a two‐product model, we show that the manufacturer should utilize its capacity more in earlier periods when the demand for both products is more positively correlated.     

“国防一线”的“三线建设”——云南三线建设的历史研究

云南处于援越抗美和对越自卫反击战的国防一线,同时又是我国地缘国防战略的大后方。既是“一线”又是“三线”的特殊地缘政治环境,赋予了云南三线建设独特的面貌和经验。在1964年至1980年的云南三线建设历程中,经历了两个建设高潮。文章试图真实再现各个阶段的规划部署、实施过程,分析出现的问题,以弥补相关研究的不足。这场特殊的“备战经济”建设,为保卫边疆安全、巩固国防发挥了应有的作用,同时也为云南的经济社会发展做出了重大的贡献。     

山寨制造的正名及调控

山寨制造和山寨文化的泛化,使中国信用建设遭遇了前所未有的挑战。规制山寨,一方面是重构社会信用体系,另一方面是建立中国标准,掀起世界产业革命,提高中国在国际标准和国际规则方面的话语权和决定权。我们必须进一步厘清山寨文化的各种表现、真实本质和国际比较,做好山塞制造的规范和调控,从而实现中国信用建设的科学发展。     

教育研究思想生产的多维因素分析

教育研究应是有“思想”的,教育研究者应生产有“思想”的教育研究,但整个中国教育研究现实语境的一个突出特点却是思想的“式微”。从“思想”的角度反思中国的教育研究,剖析思想生产的多维因素乃当前教育研究诉诸思想的有力回应,也是教育研究回归其本来使命的重要选择。     

自贡盐业契约“出山约”与“出丢上中下节约”研究

在清代民国时期,四川自贡井盐生产过程中出现了“出山约”、“上、中、下节约”等特殊契约形式,导致这种契约形式出现的原因是多方面的,其中自然环境、盐井开采技术以及市场竞争是导致这些契约关系出现的重要原因。这些契约形式的出现对当时自贡地区盐业生产产生了极大的影响,有效地解决了投资者与地主之间的矛盾,保证了井盐开采所需资金来源,分散了投资风险,优化了盐井生产组织形式,提升了投资的积极性,从而使自贡地区的井盐生产能形成独特的生产模式,长盛不衰。     

从艺人经纪模式看中国影视明星高片酬现象

在中国,影视制作业务与经纪业务未被严格分离,艺人经纪主要采取制作与经纪合一模式,这种模式下艺人权益较易受损.艺人经纪模式会随着艺人产品处于其生命周期的不同阶段而发生变化,形成了依托制作资源帮助艺人发展的制片人、经纪人、经理人三位一体模式,制作公司内的经纪人工作室联盟模式和以明星、名导、名编为核心成立的独立艺人工作室模式.中国影视明星的高片酬是在制作与经纪合一模式下对编剧的重视程度不够、作品缺乏市场检验渠道及经纪公司缺乏成熟的造星机制等问题所致,而要形成影视经纪行业未来发展的良性循环,独立艺人经纪模式更符合产业发展的长期需要.     

Parameter estimation of a composite production function model based on improved artificial fish swarm algorithm and model application

The traditional Cobb–Douglas production function uses the compact mathematical form to describe the relationship between the production results and production factors in the production technology process. However, in macro-economic production, multi-structured production exists universally. In order to better demonstrate such input–output relation, a composite production function model is proposed in this article. In aspect of model parameter estimation, artificial fish swarm algorithm is applied. The algorithm has satisfactory performance in overcoming local extreme value and acquiring global extreme value. Moreover, realization of the algorithm does not need the gradient value of the objective function. For this reason, it is adaptive to searching space. Through the improved artificial fish swarm algorithm, convergence rate and precision are both considerably improved. In aspect of model application, the composite production function model is mainly used to calculate economic growth factor contribution rate. In this article, a relatively more accurate calculating method is proposed. In the end, empirical analysis on economic growth contribution rate of China is implemented.