Heart analytics: Analytical modeling of cardiovascular care

Cardiovascular diseases (CVDs) are the leading cause of death and disability both in the United States and worldwide. Despite high morbidity, mortality, and cost in the United States and global healthcare systems, cardiovascular care has been understudied in the healthcare operations management literature. In this paper, we identify research opportunities for healthcare operations management scholars to aid in improving cardiovascular care. We focus on three burdensome conditions, including (1) coronary artery disease, (2) stroke, and (3) heart failure, which, collectively, lead to the vast majority of CVD‐caused mortality and disability. For each condition, we characterize a typical patient's journey in receiving cardiovascular care, elucidating key challenges in improving care and outlining research questions for healthcare operations management scholars. We close with a reference to new research opportunities that emerge as artificial intelligence is likely to transform much of cardiovascular care.     

垂直刚性面边界条件下水下爆炸气泡运动的理论研究

为研究垂直边界面对水下爆炸气泡脉动的影响,根据势流理论建立了垂直边界面条件下水下爆炸气泡运动的理论模型,编制计算程序进行求解。对水下爆炸气泡脉动运动的特点、流场的速度及压力的分布、气泡引起的载荷形式进行了分析,结果表明,此模型能够反映水下爆炸气泡和周围流体介质的运动规律,并能进行定量的计算。     

基于Teamcenter的产品维修性设计集成解决方案

基于产品生命周期管理(PLM)解决方案Teamcenter,构建了维修性设计与分析工作集成到产品设计过程中的系统体系结构;建立了支持维修性设计分析工作的数据模型;对不同的维修性设计分析工具以合适的方式进行了集成;将维修性设计与分析工作纳入到产品研制过程中,并建立了具体的维修性工作的业务流程。     

DN150装配式管线涡街流量检测装置研制

涡街流量检测技术是振动式流量仪表中应用最广泛的一种,具有测量范围宽、精度较高、重复性好、可靠性高、不受介质物性和组分变化影响、不需精细过滤、流阻小等一系列优点,特别适合在装配式输油管线上应用.介绍了DN150装配式管线涡街流量检测装置,重点介绍研制中解决的几个关键技术问题.     

压制火炮火控系统的改进思路初探

通过对压制火炮的特点和火控系统的现状进行分析,探讨提出了压制火炮火控系统未来的改进思路,采用新型作战使用流程、简化系统硬件构成、优化人机交互界面、合理利用总线技术。这种思路基于顶层设计的理念,从作战使用与系统构成上对火控系统进行了优化与简化,通过降低系统复杂度、改善人机交互界面来提高可靠性和易用性,使火控系统具有良好的使用灵活性和扩展性,以更好地适应未来信息化战场的作战使用。     

The impact of manufacturer rebates on supply chain profits

Manufacturer rebates are commonly used as price discount tools for attracting end customers. In this study, we consider a two‐stage supply chain with a manufacturer and a retailer, where a single seasonal product faces uncertain and price‐sensitive demand. We characterize the impact of a manufacturer rebate on the expected profits of both the manufacturer and the retailer. We show that unless all of the customers claim the rebate, the rebate always benefits the manufacturer. Our results thus imply that “mail‐in rebates,” where some customers end up not claiming the rebate, particularly when the size of the rebate is relatively small, always benefit the manufacturer. On the other hand, an “instant rebate,” such as the one offered in the automotive industry where every customer redeems the rebate on the spot when he/she purchases a car, does not necessarily benefit the manufacturer. © 2007 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

Machine scheduling with an availability constraint and job delivery coordination

In this paper we study the scheduling problem that considers both production and job delivery at the same time with machine availability considerations. Only one vehicle is available to deliver jobs in a fixed transportation time to a distribution center. The vehicle can load at most K jobs as a delivery batch in one shipment due to the vehicle capacity constraint. The objective is to minimize the arrival time of the last delivery batch to the distribution center. Since machines may not always be available over the production period in real life due to preventive maintenance, we incorporate machine availability into the models. Three scenarios of the problem are studied. For the problem in which the jobs are processed on a single machine and the jobs interrupted by the unavailable machine interval are resumable, we provide a polynomial algorithm to solve the problem optimally. For the problem in which the jobs are processed on a single machine and the interrupted jobs are nonresumable, we first show that the problem is NP‐hard. We then propose a heuristic with a worst‐case error bound of 1/2 and show that the bound is tight. For the problem in which the jobs are processed on either one of two parallel machines, where only one machine has an unavailable interval and the interrupted jobs are resumable, we propose a heuristic with a worst‐case error bound of 2/3. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

The strategic effects of a merger upon supplier interactions

We consider how a merger between two naturally differentiated dealers affects their interactions with a common supplier and identify conditions under which the merger can increase or decrease the combined net worth of the two firms. Among other things, we find that the attractiveness of merging depends upon the extent to which end demand can be stimulated by either an upstream supplier or the dealers. Specifically, the greater the supplier's ability to invest in stimulating end demand, the more likely it is that the naturally differentiated firms will be better off operating independently than merging. On the other hand, if the greatest opportunities for stimulating demand are through the service that is provided by the dealers, then merging their operations will be more attractive. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2007     

战士自我意识发展变化对部队管理的影响及对策

自我意识是影响部队管理的一个重要心理因素。新时期,青年战士的自我意识发生了一些新的变化,对部队管理产生了积极影响与不利影响。对此,基层管理中应采取三种办法增强效能:挖掘潜能、因势利导、制定适度目标。     

空气采样感烟火灾探测系统在大空间中的应用

介绍了高灵敏度空气采样感烟火灾探测系统的性能、结构特点及工作原理,并重点讨论了此系统在高大空间的应用。