Integrated retail decisions with multiple selling periods and customer segments: Optimization and insights

Integrating retail decisions on such aspects as assortment, pricing, and inventory greatly improves profitability. We examine a multi-period selling horizon where a retailer jointly optimizes assortment planning, pricing, and inventory decisions for a product line of substitutable products, in a market with multiple customer segments. Focusing on fast-moving retail products, the problem is modeled as a mixed-integer nonlinear program where demand is driven by exogenous consumer reservation prices and endogenous assortment and pricing decisions. A mixed-integer linear reformulation is developed, which enables an exact solution to large problem instances (with up to a hundred products) in manageable times. Empirical evidence is provided in support of a classical deterministic maximum-surplus consumer choice model. Computational results and managerial insights are discussed. We find that the optimal assortment and pricing decisions do not exhibit a simple, intuitive structure that could be analytically characterized, which reflects the usefulness of optimization approaches to numerically identify attractive trade-offs for the decision-maker. We also observe that suboptimal inventory policies significantly decrease profitability, which highlights the importance of integrated decision-making. Finally, we find that the seasonality of consumer preferences and supply costs present an opportunity for boosting the profit via higher inventory levels and wider assortments.     

Assessing Major Accident Risks to Support Land‐Use Planning Using a Severity‐Vulnerability Combination Method: A Case Study in Dagushan Peninsula,China

Major accident risks posed by chemical hazards have raised major social concerns in today's China. Land‐use planning has been adopted by many countries as one of the essential elements for accident prevention. This article aims at proposing a method to assess major accident risks to support land‐use planning in the vicinity of chemical installations. This method is based on the definition of risk by the Accidental Risk Assessment Methodology for IndustrieS (ARAMIS) project and it is an expansion application of severity and vulnerability assessment tools. The severity and vulnerability indexes from the ARAMIS methodology are employed to assess both the severity and vulnerability levels, respectively. A risk matrix is devised to support risk ranking and compatibility checking. The method consists of four main steps and is presented in geographical information‐system‐based maps. As an illustration, the proposed method is applied in Dagushan Peninsula, China. The case study indicated that the method could not only aid risk regulations on existing land‐use planning, but also support future land‐use planning by offering alternatives or influencing the plans at the development stage, and thus further enhance the roles and influence of land‐use planning in the accident prevention activities in China.     

医学生择业过程中的心理状况与职业生涯规划

随着大学毕业生人数的激增以及用人单位对于专业化程度要求的提高，就业形势变得日益严峻。同时，由于地区间经济发展的不平衡，人才往城市倾斜现象较为严重，由此出现城市与乡镇医院人才供求比例严重失衡。伴随社会问题出现的是医学生对于职业生涯规划的定位不准确而产生的各种心理问题，这些心理上的困境正严重地威胁着医学生职业前途。本文通过对医学生择业困境中的心理状态进行溯源与探讨，并结合我国目前医学生群体的就业状况，论述医学生择业过程中存在的心理问题，提出有针对性的解决方案与符合医学生群体特征的职业生涯规划，以期能为医学生群体带来一定的帮助。     

Reframing Resilience: Equitable Access to Essential Services

We urgently need to put the concept of resilience into practice if we are to prepare our communities for climate change and exacerbated natural hazards. Yet, despite the extensive discussion surrounding community resilience, operationalizing the concept remains challenging. The dominant approaches for assessing resilience focus on either evaluating community characteristics or infrastructure functionality. While both remain useful, they have several limitations to their ability to provide actionable insight. More importantly, the current conceptualizations do not consider essential services or how access is impaired by hazards. We argue that people need access to services such as food, education, health care, and cultural amenities, in addition to water, power, sanitation, and communications, to get back some semblance of normal life. Providing equitable access to these types of services and quickly restoring that access following a disruption are paramount to community resilience. We propose a new conceptualization of community resilience that is based on access to essential services. This reframing of resilience facilitates a new measure of resilience that is spatially explicit and operational. Using two illustrative examples from the impacts of Hurricanes Florence and Michael, we demonstrate how decisionmakers and planners can use this framework to visualize the effect of a hazard and quantify resilience-enhancing interventions. This “equitable access to essentials” approach to community resilience integrates with spatial planning, and will enable communities not only to “bounce back” from a disruption, but to “bound forward” and improve the resilience and quality of life for all residents.     

Beyond ‘bikelash’: engaging with community opposition to cycle lanes

This article explores the phenomenon of ‘bikelash’, or organised community opposition to cycle lanes. Urban residents commonly cite bicycle lanes, a space on the road reserved for cyclists, as the infrastructure most likely to encourage them to cycle. Yet the introduction of cycle lanes is often controversial. This article explores the phenomenon of bikelash, asking: Why does it occur? And what are the best ways to respond to it? A critical review of the literature on ‘contested’ cycle lane projects is undertaken in order to explore how this phenomenon can best be conceptualised within a mobilities framework.     

基于土地整治视角下的农村道路建设

以涉县的农村道路建设为例,结合该地区土地整治特点,通过对农村道路发展现状的分析，在强化道路主体、道路绿化、生态排水、配套设施设计的基础上，强化组织领导、资金筹措、绿色生态、管理维护，充分利用当地资源，选择稳定性较好的材料进行铺筑，栽种本地适宜的树种、草种，将生态和人文设计理念融合到道路设计中，丰富并传承乡村文化，发挥其观赏价值、应用价值和经济价值。     

湖南民族地区生态文明建设的国土空间规划应对

加强生态文明建设是破解湖南民族地区发展滞后、提高其生态环境系统治理和保护水平的关键举措。结合湖南民族地区生态文明建设的总体情况,分析了湖南民族地区的人口分布、自然地理、经济发展和民俗文化等特征,提出了基于“两山”理念的湖南民族地区国土空间规划重点,即：加强空间联动,优化民族地区空间布局;创新扶贫方式,构建民族地区特色产业体系;提高资源利用效率,加大民族地区生态补偿力度。同时,提出了湖南民族地区国土空间规划路径：加强“三生空间”管控,转变依靠资源型致富的传统思维;创新生态治理方式,构建产业体系;注重生态系统整体保护,有效提升空间治理水平。     

社会主义新农村建设的路径探讨

社会主义新农村建设是解决我国“三农”问题,实现城乡统筹发展的重大历史任务,其成功的关键在于形成符合我国农业、农村和农民发展规律的有效路径。本文主要从科学规划、改善农村发展环境、培育新型农民和创新农民组织体系等四个方面对推进社会主义新农村建设的实践路径进行了理论和操作层面的分析。     

德国保护地体系评述与借鉴

德国保护地体系是沿袭历史逐步形成的。首先论述了德国保护地体系的法律基础,并对11类德国保护地的定义、现状和管理事权进行了解释。继而对德国保护地体系进行归纳总结:各类保护地由《联邦自然保护法》统筹、分级管理,以自然保护为核心目标;各类保护地地界交织现象广泛存在,从而实现更广泛的连接;关注文化与自然的融合,强调文化景观管理;各类保护地倾向不同功能,平衡保护与利用并合理发展可持续旅游;法治巩固本土特色的保护地。最后对我国的保护地体系进行相关思考:法定保护地须纳入国土空间规划;包容自然与文化景观的保护地可与"自然公园"相得益彰;对保护地的利用及管理需要通过统一规划实现。