Minimization of passenger takeoff and landing risk in offshore helicopter transportation: Models,approaches and analysis

Offshore petroleum industry uses helicopters to transport the employees to and from installations. Takeoff and landing represent a substantial part of the flight risks for passengers. In this paper, we propose and analyze approaches to create a safe flight schedule to perform pickup of employees by several independent flights. Two scenarios are considered. Under the non-split scenario, exactly one visit is allowed to each installation. Under the split scenario, the pickup demand of an installation can be split between several flights. Interesting links between our problem and other problems of combinatorial optimization, e.g., parallel machine scheduling and bin-packing are established. We provide worst-case analysis of the performance of some of our algorithms and report the results of computational experiments conducted on randomly generated instances based on the real sets of installations in the oil fields on the Norwegian continental shelf. This paper is the first attempt to handle takeoff and landing risk in a flight schedule that consists of several flights and lays ground for the study on more advanced and practically relevant models.     

项目管理中的企业文化建设研究

随着项目管理机制在企业经营中应用范围的逐步扩展、深度的逐渐增强,项目管理中企业文化建设的意义日益凸显。然而,由于中国项目管理起步较晚,企业文化对于项目管理的促进作用还没有得到有效发挥,项目管理中的企业文化建设还存在着一些问题,如难以形成共同价值体系、制度贯彻不彻底、缺乏考核体系等。为了保证项目管理中企业文化建设进程的顺利推进,需要在项目管理中企业文化建设的实施和控制活动中求同存异、整合员工价值观,做到刚性管理与柔性管理相结合;同时,要建立人才管理与培训机制以及良好的沟通渠道,不断提高创新能力,增强团队活力。     

建设工程内部承包合同司法适用问题探究——以审判实践的冲突为样本

建设工程内部承包合同的效力究竟应当如何认定、在内部承包形式下具有怎样的对内对外效力、实际承包人与发包人或者第三方出现的纠纷应当如何进行解决等,在司法领域莫衷一是.内部承包合同,调整的是双方基本劳动报酬外的经营性利益分配关系.规范的内部承包合同并不同于转包合同或挂靠经营.虽然现有法条在某种征表下似乎是对内部承包合同作出了禁止性的规定,但是如果对法条进行体系的理解与整体的解读,内部承包合同并非属于当然禁止的范围     

Production and changeover control policies of a class of failure prone buffered flow-shops

This article deals with a stochastic optimal control problem for a class of buffered multi-parts flow-shops manufacturing system. The involved machines are subject to random breakdowns and repairs. The flow-shop under consideration is not completely flexible and hence requires setup time and cost in order to switch the production from a part type to another, this changeover is carried on the whole line. Our objective is to find the production plan and the sequence of setups that minimise the cost function, which penalises inventories/backlogs and setups. A continuous dynamic programming formulation of the problem is presented. Then, a numerical scheme is adopted to solve the obtained optimality conditions equations for a two buffered serial machines two parts case. A complete heuristic policy, based on the numerical observations which describe the optimal policies in system states, is developed. It will be shown that the obtained policy is a combination of a KANBAN/CONWIP and a modified hedging corridor policy. Moreover, based on our observations and existent research studies extension to cover more complex flow-shops is henceforth possible. The robustness of such a policy is illustrated through sensitivity analysis.     

谈建设工程造价的全过程控制

建设项目工程造价管理的基本内容就是合理确定和有效地控制工程造价．本文对如何做到“事前把关、过程与动态管理为特征”的全过程控制进行了论述．     

通过试点与实践推进制度创新——以L县检察院附条件不起诉的试点为样本

中国刑事诉讼制度正在发生深刻的变迁,现代性制度正在实践中艰难形成。L县检察院关于附条件不起诉制度的探索与实践,便体现了这种制度变迁的方式与实践创新。地方性司法机构的"试点性改革"与"试错性试验",无疑推动了中国刑事诉讼制度的发展。应保持一种开放的胸襟与开放的心态,通过实践中的不断试点改革来确认与完善新的制度设置,以走出一条推进中国式法治建设有效、成功的道路。     

人大常委会决定重大建设项目问题探讨

重大建设项目是重大事项的内容之一，应当由人大及常委会作出决定。实践中，由人大常委会决定的重大建设项目是非常少的。其原因在于人大常委会与政府之间的关系没理顺。人大常委会与政府对重大建设项目均有决定权。现从二者决定权的性质、行使的侧重点不同探讨人大常委会如何决定重大建设项目问题。     

The Effects of Multitasking on Operations Scheduling

This study considers a typical scheduling environment that is influenced by the behavioral phenomenon of multitasking. Under multitasking, the processing of a selected job suffers from interruption by other jobs that are available but unfinished. This situation arises in a wide variety of applications; for example, administration, manufacturing, and process and project management. Several classical solution methods for scheduling problems no longer apply in the presence of multitasking. The solvability of any scheduling problem under multitasking is no easier than that of the corresponding classical problem. We develop optimal algorithms for some fundamental and practical single machine scheduling problems with multitasking. For other problems, we show that they are computationally intractable, even though in some cases the corresponding problem in classical scheduling is efficiently solvable. We also study the cost increase and value gained due to multitasking. This analysis informs companies about how much it would be worthwhile to invest in measures to reduce or encourage multitasking.     

Managing Logistics in Regional Banknote Supply Chain Under Security Concerns

We study the logistics problem faced by Regional Branches (RBs) of a central bank in managing the currency supply under security concerns. While making banknote supply decisions to Sub‐Branches (SBs), the management of RB must achieve two goals simultaneously: (i) guarantee that each SB has sufficient inventories of all denominations of banknotes to satisfy the demands from all commercial banks within its service area, and (ii) control the annual spending on this banknote supply operation. Due to security concerns, the following methods are implemented in the process of transporting banknotes: (i) the capacity of a cash truck is limited by the total face value (instead of the physical space) of banknotes, and (ii) empty decoy trucks are deployed along with the trucks filled with banknotes. After deriving a polynomial‐time strategy to guarantee an optimal solution for the special Bin‐Packing Problem faced in this study, we provide an exact formulation for the RB's supply planning problem. We also propose several polynomial‐time algorithms for deriving either optimal or near‐optimal solutions for the problem under different settings. Using the weekly demand data obtained from the central bank, we verify the performance of our algorithms, and analyze the impacts of changes in these features and in the fleet capacity on the total cost incurred by an RB under various scenarios.     

项目制研究的现状与新路径

项目制作为一种新的国家治理体制,在中国经济与社会发展中发挥着日益深广的影响力。文献考察发现,国内研究围绕五个主要议题展开,研究成果较集中于近六年内;国外研究也有一定基础。既有研究尚存在两方面突出问题：一是研究视角有缺失,偏重宏观层面和政府视角而忽视了基层村庄社会的回应;二是研究议题失均衡,对项目制负面效应发生机理和防范机制研究还很薄弱。“村庄回应”是项目制研究值得重视的一条新路径,以此路径切入,可探寻“项目进村”的实践逻辑与问题成因,是有利于找到优化基层治理格局、提升项目制实践成效并防范“项目进村”负面效应的有效方法。