Advanced Materials Research Vols. 433-440

Abstract: A differential evolution algorithm based job scheduling method is presented, whose optimization target is production cost. The cost optimization model of hybrid flow-shop is thereby constructed through considering production cost as a factor in scheduling problem of hybrid flow-shop. In the implementation process of the method, DE is used to take global optimization and find which machine the jobs should be assigned on at each stage, which is also called the process route of the job; then the local assignment rules are used to determine the job’s starting time and processing sequence at each stage. With converting time-based scheduling results to fitness function which is comprehensively considering the processing cost, waiting costs, and the products storage costs, the processing cost is taken as the optimization objective. The numerical results show the effectiveness of the algorithm after comparing between multi-group programs.

Abstract: The cost of the e-business enterprise can be divided into four fields: ad cost, logistic cost, web construction cost, service cost. From the perspective of growth of the enterprises, the development of the e-commerce enterprises can be divided into three stages. This article points out the relations between the period and the cost control aims. More researches are needed to find out the method to choose optimum weighted function for keep balance.

Abstract: A qualitative analysis has been made on the slow development of the engineering project management and corresponding cost control method which has been the bottleneck of the rapid development in the engineering industry and construction production. The economic development of the market and the changing investigation subjects urgently need the reform and renewal to the current engineering project management and the cost control. The unification of engineering project management system in China to the international practice after reform not only adapts the requirements of national economic market development, but also creates conditions for the Chinese construction enterprises to participate in the international construction market successfully.

Abstract: Since the 1980s, China's power industry has undergone a series of reforms, as the goal of improving efficiency. By reforms, the central planning system was broken up and the market-oriented modern enterprise system is being established. This paper reviews the three main stages of the reforms of China's power and introduces related reform measures. The reforms include the separation of government and power enterprises, the division between power generation firms and power grids, electricity regulatory and other aspects. Electricity is the most important energy in modern society, while production of electricity with renewable energy can reduce pollution. As a focus of both domestic and international concerns with greenhouse gas emissions, utilization of renewable energy is one of the important ways for China to realize sustainable development.

Abstract: The decision information system of off-line handwritten Chinese character recognition based on variable precision rough set is constructed in this paper. The granular variable in granular theorem is introduced, the granular entropy of feature attributes knowledge and decision attributes knowledge and relative granular entropy is defined. The attribute reduction algorithm with several features is given out. Moreover, the recognition structure which has three-tier classifier based on rough set iterated several times is designed. And it resolved the problem of high rate of rejection and coincident code with a single classifier and recognition only once effectively. The experiment results show that the method is feasible and effective.

Abstract: The main theme of this paper is to present robust guaranteed cost control laws for a class of fuzzy bilinear systems (FBS) with parametric uncertainties. First, the piecewise Lyapunov function (PLF) method is utilized to design a fuzzy controller, which ensures the robust asymptotic stability of the closed-loop system, and then the robust guaranteed cost control law is also proposed. Second, based on the Schur complement and some variable transformations, some sufficient conditions are derived to guarantee the stability of the overall fuzzy control system via linear matrix inequalities (LMIs). Finally, a numerical example is utilized to demonstrate the validity and effectiveness of the proposed control scheme.

Abstract: New trends of environmental, regulation, and economical aspects cause an increasingly distributed generation (DG) connected to distribution networks. Existing distribution networks, however, are not designed to accept extensive DG. Many novel network reinforcement approaches have been proposed for solving the network connection issues. For economic viewpoints, it is important for determining cost-effective network reinforcement solutions for facilitating the meeting of DG growth goals while maintaining the network supply quality and operation security. This paper aims to address network reinforcements investment analysis for accommodating DG capacity growth. A methodology is proposed in this approach to quantify the impact of future increases in DG through the undertaking of a case study based on a generic distribution network model and different projected DG scenarios. Some available network reinforcement options used for managing fault level, voltage level, and power flows are presented and their costs required for meeting supply quality requirements of different types of customers are analyzed. Test results of applications of the proposed method to a practical distribution system are presented. Analysis results can assist distribution network operators in determining proper reinforcement options for managing distributed energy resources.

Abstract: A new model is developed for a cascade of four hydropower reservoirs operation. The aim is to improve the total power generation from the system. Daily data of reservoir level, release and power generated which varies from 4-20 years are used for analysis. Long-term data of reservoir level and inflow are used to determine the critical period. The critical period is classified into four seasons; these are filling, depleting, upper and lower level operating season. Mathematical models are used to rank the refill and the deplete order of the reservoirs. A new rule models are presented using the results of refill and depletion ranks. Power generation using the developed model is compared to the long-term historical generated; and it is found that the new rule model boost the daily power production by 5.3% and the plant factor by 2%.

Abstract: In contrast with the traditional distribution expansion planning approach, significant giants can be realized in terms of outage loss, supply quality, and load carrying capacity from the distribution expansion with a suitable size and siting of distributed generation (DG). However, in order to achieve these planning goals, it often requires network upgrades to accommodate the anticipated power flows in the distribution system with DG. To improve utilization and expansion of distribution system, this paper proposes a methodology to derive the optimal strategy of generation expansion and network upgrades including line capacity upgrade, line switches, and network reconfiguration for multiobjective distribution expansion planning by minimizing network investment cost, feeder losses, customer interruption cost, and voltage drop. A multiobjective genetic algorithm (MOGA) is employed to quantify the effects of DG and network upgrades placements on distribution network under load increases and during distribution outages. To demonstrate the effectiveness of the proposed methodology, an IEEE feeder test system is selected for computer simulation to explore the benefits of DG placement for distribution system utilization and expansion.

Abstract: Tahe Oilfield is an significant petroleum exploitation and development area in Tarim Basin for SINOPIC. Carboniferous Kalashayi Formation has become an important oil-bearing series for increasing and maintaining production, and for finding backup resource in this Oilfield. Based on the theories and methods of sedimentology, by using the sesmic, log and core data, the sedimentary facies of Carboniferous Kalashayi Formation in the south of Tahe Oilfield are analyzed deeply. Through the study of characteristics of the rock type and texture,sedimentary structure, sedimentary sequence, stratic structure, paleontology, geochemistry and geophysics of Kalashayi Formation, the Sand-shale Section is attributed to tidal flat deposits which has a nature of estuary. The study area are mainly dominated by intertidal zone, including mud flat, sand-mud flat, sand flat, tidal channel and mouth bar microfacies. The Up-mudstone Section developed lagoonal facies. This study provides favorable support for the further petroleum exploration in study area.