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Developing low permeability reservoirs is currently a big challenge to the industry. Because low permeability reservoirs are of low quality and are easily damaged, production from a single well is low, and there is unlikely to be any primary recovery. Therefore, in most cases, unconventional recovery methods are used for economic development of those reservoirs. Hydraulic fracturing has been an important...
The inventory model for deteriorating items with general trapezoidal type demand rate and partial backlogging rate is investigated in this paper. The deteriorating rate is a generous positive time-varying Weibull function, and the demand rate is a general trapezoidal type function. In this model, we allow the product out of stock. Assume that production function is a linear function of inventory level...
This paper seeks to explore the influencing mechanism of IT on the productivity of knowledge work. Firstly, based on the analysis of the existing research, the key characteristics of IT, knowledge work and its productivity are defined. Secondly, a three layer conceptual model is proposed. With a questionnaire designed for the empirical study and the data collected, a mathematical model for the analysis...
To achieve the goals of: (1) reflecting the value information of resource flows and points to the key areas for improvement in an enterprise, (2) providing effective decision-making in environmental and resource management, and (3) showing the direction of the enterprise's sustainable development, this paper develops the resource flow equation which includes three kinds of indicators: (1) resource...
Worker differences are fundamental consideration in personnel assignment which is one of the key decisions that influence the productivity and quality of assembly production. The personnel station fitness is proposed to describe the suitability of the worker for the assembly activity they assume. A personnel assignment model for assembly production is constructed, and the objectives are maximizing...
Data envelopment analysis (DEA) measures the relative efficiency of decision making units (DMUs) with multiple inputs and multiple outputs. DEA-based Malmquist productivity index measures the productivity change over time. The Malmquist productivity index based on DEA can be decomposed into two components: efficiency change index and technical change index. Through utilizing the principle of isoquant,...
In China, with the ever-increasing completeness of market economic system and the enhancement of the sense of self-realization for the college teachers in China, the turnover rate of college teachers is greater and greater. For most of the existing literatures in China, there is a popular view that college teachers turnover rate negatively influences college performance which has not received enough...
Focusing on the topic of model integration, we develop a Workflow-based Spatial Modeling Environment (WF-SME) which enables scientists and modeling users easy to design and create of complex systems models through a drag-drop operation or editing mathematical formula in model constructor. WF-SME, a visual integrated modeling environment is mainly used for the rapid realization of model dynamic integration,...
The ecological footprint (EF) analysis is a quantitative method to assess the sustainability of regional development. On the basis of the theories and methodology of EF, the procedure and the relevant models were developed for estimating the cumulative changes of ecological capacity caused by sea reclamation. And then they were applied to the case study of Xiamen Western Bay based on the calculation...
This paper empirically investigates the impact of technology transfer which consists of imports of technology and purchase of domestic technology on total factor productivity for a cross sectional sample of large and medium-sized industrial enterprises by 30 major provinces or regions in China. The possible determinants of total factor productivity are sought with special focus on technology transfer...
Based on Malmquist Productivity Index and the data of 29 provinces of China within the period of 1991-2007, this paper decomposes the changes of TFP (TFP-ch) into technical changes (TECH-ch) and technical efficiency changes (TE-ch), and makes a further analysis on the convergence of technical efficiency among different sections. The conclusions are as following: (1) In all of the eastern, mid and...
This paper builds on a new methodology of modeling linear schedules with singularity functions. These unique functions have been used successfully for criticality and float analyses. The approach is extended to deriving one flexible equation for the complete resource profile of a schedule, including any changes in the resource rates of activities. A subsequent equation describes the first moment of...
Energy and environmental sustainability is a major global trend for the 21st century. Thermal discomfort and poor air quality in office buildings can result in loss of productivity, absenteeism and medical problems. The most frequently identified causes are related to inadequate ventilation and contaminants from indoor sources. Task ambient air conditioning aims to provide each occupant with personalized...
This article uses panel data of 2000-2006 years to analyze the FDI technology spillover to the private enterprises in Jiangsu province. The results indicate that the foreign enterprises have exerted a positive technology spillover to private enterprises in Jiangsu province. The bigger of foreign capital proportion and the fixed-assets are, the more spillover has. As far as the factors to the output...
Increasing the supply of public goods to rural areas is a crucial step to promote the construction of a new socialist countryside, which is a major historic task in China's modernization. Therefore, it bears great policy implication to find out how the government should control the investment in countryside and which public goods should be given priority in order to make full use of the limited government...
The advantages of U-shaped lines, such as improving productivity and quality, are very well known in industry. In many factories, traditional straight assembly line configurations were switched to U-shaped layouts in the past few years. U-shape line balancing problem (ULBP) is received more and more people attention. In this paper, an effective heuristic is proposed for solving type 1 of the fuzzy...
The aim of this paper is to develop an analytic representation of Chinese labor productivity as a function of various classic and newly considered parameters. Its econometrics-based approach uses an elaborated version of the Cobb-Douglas production function, and includes both classic parameters (capital, labor ratio, average firm size, time) and new ones (proportion of output produced by enterprises...
While the rapid growth of gross domestic product (GDP) and information technology (IT) investment in China has been seen in recent years, there has little research on interpreting Chinese economic growth from a perspective emphasizing IT as a factor. The paper focuses on the role of information technology in Chinese economic growth during the period from 1990 to 2004, and examines the growth contribution...
The measures to science and technology progress have been considered all long, and various methods may cause different results. Based on the research of our predecessors, the article put forward Time Varying Parameter model, which settle the dilemma in the process of measuring. Using this model, the author makes empirical study to the correlation between science & technology and economic growth...
Based on the equilibrium real exchange rate (ERER) put forward by Edwards (1989) and Johansen cointegration estimation methodology, this paper estimates the equilibrium real exchange rate of Chinese Yuan from 1980 to 2007 and calculates the real exchange rate misalignment. The result shows that the real exchange rate of Chinese Yuan was deviated from the equilibrium substantially most of the time,...
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