Sustainable inventory management in blood banks considering health equity using a combined metaheuristic-based robust fuzzy stochastic programming

This study examines the challenges of healthcare systems toward sustainable inventory management of blood products. In this regard, three main goals are pursued; First, promoting social equity in providing medical services to various patients and reducing the risk to lives. Second, the optimal management of medical products in a way that minimizes economic costs. Third, optimal management of biological waste due to inventory corruption and reduction of greenhouse gas emissions caused by transportation, to the least environmental pollution. To achieve these purposes, a practical demand-driven multi-objective inventory model is presented by utilizing hybrid policies in an uncertain environment. In the proposed model, the demands are in two types, including elective and non-elective. These demands are classified according to their medical urgency, substitution allowance, and product freshness. A hybrid robust fuzzy stochastic programming approach is applied to capture real-world uncertainties. The proposed model is implemented for blood platelet. The solution is obtained using a combined metaheuristic technique established on genetic algorithms and simulated annealing according to global and local search paradigms. To create a proper perspective for decision-makers, sensitivity analysis is performed. Besides, the performance of the model is proved by the realization. The results show that the performance of the proposed RFSP model is better than the Nominal model. Also, it performs well in minimizing the overall system costs and environmental degradation, besides reducing shortage and wastage. It is also effective for taking steps toward equity in health and suggests a proper strategy for dealing with emergencies.     

THE EFFECTS OF ECONOMIC REGULATION IN THE ISTANBUL TAXICAB MARKET

This paper discusses the regulation of the Istanbul taxicab market and its consequences. While price and entry regulations are common to many taxi markets, there are significant differences in their institutional frameworks. We examine the problems of the Istanbul market and offer recommendations to improve its efficiency.     

基于区域合作的无障碍旅游机制构建

我国旅游业已进入区域协同与跨区域竞争的时代,其发展趋势是实现区域旅游合作。旅游业区域合作的目标就是在一定区域范围内构建无障碍旅游机制,实现一体化,使区域旅游要素可以实现最大限度的自由流动,实现旅游资源的最优配置。     

An environmental performance index for products reflecting damage costs

Several studies have demonstrated how to use DEA (Data Envelopment Analysis) based techniques to estimate environmental performance indices. None of these studies, however, are taking information on the environmental damage costs of the pressure types considered into account. This study is bridging a gap between environmental indices founded in physical pressures and damage costs founded in welfare economics. The aim of the paper is twofold: first, to demonstrate how to implement the information on environmental damage costs within a DEA based environmental performance index, and second, to estimate these indices at product level by using Danish input-output data and environmental data from 1997.     

基于社会责任的旅行社企业文化建设研究

企业文化是决定企业兴衰的关键因素,甚至是企业间竞争的最高境界。当前中国旅行社恶性竞争加剧,社会责任缺失的现象较为严重,给游客、旅行社员工和合作企业等利益相关者带来利益缺损。旅行社应通过实施具有社会责任的企业精神文化构建、行为文化建设和品牌文化创新,提高旅行社企业文化建设品位,促进旅行社自身发展,和谐旅游环境。     

关于美国战争费用的启示

本文以本次局部战争为案例,根据目前披露出来的一些数据进行初步的分析,希望能够为我们了解美国战争费用的总体情况提供参考。     

地方国企非效率投资来源选择：债权资金优先还是股权资金优先？

以2001—2009年地方国有上市公司为样本对地方国企非效率投资来源选择进行研究,结果显示：地方国企非效率投资来源选择首先是债权资金,其次才是股权资金;当拥有较多长期贷款时,企业会更倾向使用债权资金代替股权资金,并且这种选择是理性和不可逆的;在产权保护较强和信贷配置市场化程度较低的地区,企业选择债权资金替代股权资金的动机更强;随着政府干预的增强,债权资金对股权资金的替代作用减弱。     

上市公司如何在非理性世界中确定股权回报率

确定股权回报率是进行长期投资决策的关键步骤,但在现实非理性世界中难以直接运用传统财务理论所推荐的资本资产定价模型来确定股权回报率。针对FAR与NEER方法,本文首先探讨这两类方法的理论依据并揭示其本质内涵,然后说明:在非理性世界中,如果上市公司管理者追求公司价值最大化目标,那么就应该基于公司项目的基本风险来确定股权回报率;相反地,如果管理者追求近期股价最大化,那么就应该基于市场投资者的预期来确定股权回报率。     

供应链系统中的共同代理问题研究

首先综述了国内最近几年委托代理理论在供应链管理中的应用。介绍了基于多委托人-单代理人的共同代理理论。在二者的基础上，对于现代供应链中多委托人-单代理人之间的关系，从经济学的角度建立一个一般性共同代理模型，并给出模型解释以及未来可能的研究方向。     

Turning Agents into Psychological Principals: Aligning Interests of Non‐Owners through Psychological Ownership

Principals who delegate tasks to agents face the perennial challenge of overcoming agency problems. We investigate whether feelings of ownership among senior managers in the absence of formal ownership can align agents' interests with those of principals, thus turning agents into psychological principals. Using a moderated mediation model, we find that psychological ownership is positively related to company performance through the mediating effect of individual‐level entrepreneurial behaviour. We also find that the effect of psychological ownership on individual‐level entrepreneurial behaviour and, ultimately, company performance is weaker for high levels of monitoring compared to low levels. These findings offer important contributions to agency, psychological ownership, and entrepreneurship literatures.