从“不稳定性”到“不确定性”:数字化转型背景下不确定性工作的兴起及其启示

伴随数字化时代社会转型的深入推进,工作的不确定性激增成为当今社会发展的重要趋势。“不稳定工作”从传统工业社会相对确定的样态转变为数字化时代深度不确定性的形态,由此引发其在概念界定、理论建构和现实应对层面的多重困境。在此背景下,以“不确定性工作”来代替“不稳定工作”并展开新的理解具有重要的时代意义。因此,通过对比传统工业化时代“不稳定工作”与数字化时代“不确定性工作”在劳动空间、劳动时间、劳动主体、劳动关系、劳动过程和劳动结果六个维度的发展转型,我们可以勾勒出数字化时代“不确定性工作”的发展特征与基本内涵,并通过对其时代意义的揭示,为个体、企业、国家和社会的应对策略提供参考,也希望以此为未来的持续研究提供借鉴。

知识型员工的工作不安全感:影响及控制手段

建立和证实组织应对工作不安全感及其消极后果的因果链,探究组织如何有效应对和控制工作不安全感及其消极后果。通过Lisrel和SPSS等软件对来自不同行业的219份有效问卷的实证分析表明,工作不安全感显著影响知识型员工的离职倾向和幸福感;工作不确定性会引发工作不安全感;组织发展性支持作为一项压力干预策略,能有效降低知识型员工的工作不安全感和工作不确定性;同时,工作不确定性和工作不安全感在组织发展性支持与知识型员工离职倾向和幸福感之间起连续中介作用。丰富了国内关于工作不安全感的研究,同时从组织关注和个体关注两方面分析工作不安全感的后果,为当前变化情境下的企业如何有效应对和管理知识型员工的工作不安全感提供管理借鉴。

警辅人员心理需求对离职倾向影响的实证研究

警辅人员离职倾向的上升桎梏了公安事业的建设和发展。心理需求作为反映离职倾向的重要预测因素之一,目前未能得到足够的重视,因此探究心理需求和离职倾向的关系将成为研究的逻辑起点。实证研究表明,警辅人员的心理需求对离职倾向具有显著的负向影响,心理需求可正向预测工作满意度,工作满意度和工作不确定性分别在心理需求与离职倾向之间起到中介作用和调节作用。

Relationship of Uncertainty Between Polygon Segment and Line Segment for Spatial Data in GIS

The mathematic theory for uncertainty model of line segment are summed up to achieve a general conception, and the line error hand model of εσ is a basic uncertainty model that can depict the line accuracy and quality efficiently while the model of εm and error entropy can be regarded as the supplement of it. The error band model will reflect and describe the influence of line uncertainty on polygon uncertainty. Therefore, the statistical characteristic of the line error is studied deeply by analyzing the probability that the line error falls into a certain range. Moreover, the theory accordance is achieved in the selecting the error buffer for line feature and the error indicator. The relationship of the accuracy of area for a polygon with the error loop for a polygon boundary is deduced and computed.

Improved Disturbance Observer (DOB) Based Advanced Feedback Control for Optimal Operation of a Mineral Grinding Process

Advanced feedback control for optimal operation of mineral grinding process is usually based on the model predictive control (MPC) dynamic optimization. Since the MPC does not handle disturbances directly by controller design, it cannot achieve satisfactory effects in controlling complex grinding processes in the presence of strong disturbances and large uncertainties. In this paper, an improved disturbance observer (DOB) based MPC advanced feedback control is proposed to control the multivariable grinding operation. The improved DOB is based on the optimal achievable H 2 performance and can deal with disturbance observation for the nonminimum-phase delay systems. In this DOB-MPC advanced feedback control, the higher-level optimizer computes the optimal operation points by maximize the profit function and passes them to the MPC level. The MPC acts as a presetting controller and is employed to generate proper pre-setpoint for the lower-level basic feedback control system. The DOB acts as a compensator and improves the operation performance by dynamically compensating the setpoints for the basic control system according to the observed various disturbances and plant uncertainties. Several simulations are performed to demonstrate the proposed control method for grinding process operation.

Fire risk evaluation research on fully mechanized coalface based on the uncertainty measure theory

A relatively perfect coalmine fire risk-evaluating and order-arranging model that includes sixteen influential factors was established according to the statistical information of the fully mechanized coalface ground on the uncertainty measure theory. Then the single-index measure function of sixteen influential factors and the calculation method of computing the index weight ground on entropy theory were respectively established. The value assignment of sixteen influential factors was carried out by the qualitative analysis and observational data, respectively, in succession. The sequence of fire danger class of four experimental coalfaces could be obtained by the computational aids of Matlab according to the confidence level criterion. Some conclusions that the fire danger class of the No.l, No.2 and No.3 coalface belongs to high criticality can be obtained. But the fire danger class of the No.4 coalface belongs to higher criticality. The fire danger class of the No.4 coalface is more than that of the No.2 coalface. The fire danger class of the No.2 coalface is more than that of the No.1 coalface. Finally, the fire danger class of the No.1 coalface is more than that of the No.3 coalface.

Coefficient of consolidation by end of arc method

One of the most important issues in geotechnical engineering is excess pore pressure caused by clay soil loading and consolidation. Regarding uncertainties and complexities, this issue has long been the subject of attention of many researchers. In this work, a one-dimensional consolidation apparatus was equipped in a way that pore water pressure and settlement could be continuously read and recorded during consolidation process under static loading. The end of primary consolidation was obtained using water pressure changes helping to present a new method for determining the end of primary consolidation and consolidation coefficient. This method was then compared with two classical theory methods of lg t and t. Using Terzaghi's theory, the way of pore pressure dissipation for lg t, t and the new method was found and compared with experimental results. It is concluded that the new method has better results.