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30 October 2017, Volume 20 Issue 5 Previous Issue    Next Issue

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A Research on Manufacturing/Remanufacturing Production Decisions with Carbon Tax Policy and Capital Constraints Considered CHEN Weida, BI Xingming 2017, 20 (5):  1-8.  doi: 10.3969/j.issn.1007-7375.e17-4140 Abstract ( 1520 )   PDF (950KB) ( 5766 )   Save A research is conducted on the impacts of remanufacturing rate, capital constraints and carbon taxes on manufacturing/remanufacturing production decisions. First, a manufacturing/remanufacturing production decision model is established with capital constraints under the carbon tax policy, and then considering production decision capital constraints and financing, new products, remanufactured goods, expected profits and carbon emissions are researched and compared in two cases; finally, the influences are evaluated through a case study of the remanufacturing rate, consumer preferences and the unit carbon emission tax of the recovered products on the optimal yield, the expected profit and the carbon emission. The results show that, considering the financial factors, whether the recovery rate is sufficient in different circumstances or the threshold is different, under the capital constraints, the higher the recovery rate the better; With the increase of consumer preferences, as the remanufactured products by the manufacturer increase, the production of new products decreases, and the expected profits increases with the reduction of carbon emissions; the increase in carbon taxes will reduce the production of new products and increase the production of remanufacturers. However, when the carbon tax is too high, the production of remanufacturers will gradually decrease. References | Related Articles | Metrics

Dual Channel Supply Chain Collaboration Strategy Considering Product Online-compatibility TIAN Wei, HUANG Han, YANG Shixin 2017, 20 (5):  9-14.  doi: 10.3969/j.issn.1007-7375.e17-4059 Abstract ( 1257 )   PDF (410KB) ( 5752 )   Save Based on the consumer utility theory, the influences of product online-compatibility characteristic and retailer's innovation investment on the pricing and profits of supply chain members and whole supply chain profit are discussed under Bertrand and Stackelberg game between a manufacturer and a retailer. The research shows that by the manufacturer's opening a dual channel the market demand is expanded. But the profits of the retailer and the whole supply chain are decreased. So the manufacturer confronts with the difficulty of maintenance when he wants to open a dual channel. By setting an appropriate wholesale price of the manufacturer, the whole supply chain profit can be improved. It also shows that in Bertrand game when the manufacturer sets the appropriate wholesale price and prompts the retailer in the optimal innovation investment of whole supply chain, the profits of whole supply chain will be further improved. Finally the cooperation strategy of the manufacturer is proposed. All these will be helpful for the manufacturer to conduct a dual channel and choose the cooperation mode and strategy considering product online-compatibility. References | Related Articles | Metrics

A Research on Retailer's Dual Channel Ordering Strategy Under Demand Updating LI Qiang, WANG Chuanxu 2017, 20 (5):  15-20.  doi: 10.3969/j.issn.1007-7375.e17-4078 Abstract ( 840 )   PDF (920KB) ( 6025 )   Save In the quick response system, retailers are required to meet maximized market demand. With retailers in two order modes, online and offline ordering are analyzed, assuming offline order can be delivered immediately. A profit model is established respectively in the two ways. An analysis is conducted into the double channel order mode in which retailers can meet and maximize the market demand but will reduce their own profits, and the model is updated through the demand analysis to study the single channel and double channel order model selection problem to realize the maximization of the profits of retailers. Finally, a numerical example is given to demonstrate the validity of the proposed models. References | Related Articles | Metrics

A Single-level Mixed-integer Programming Model for the Competitive Facility Location Problem CHENG Chun, ZHANG Ying, XUE Zhaojie, QI Mingyao 2017, 20 (5):  21-27.  doi: 10.3969/j.issn.1007-7375.e17-3094 Abstract ( 1334 )   PDF (366KB) ( 6463 )   Save The classic facility location problem, based on the assumption of space monopoly, does not consider the existence of competition facilities. However, in application, companies have to consider rivals when making location decisions. Therefore, a competitive facility location problem is studied. A discrete network is considered, in which two players (a leader and a follower) sequentially located a fixed number of facilities, competing to capture market share. Each customer sought the nearest facility for service. The leader had to solve a bilevel linear programming problem in which the lower level was NP hard, given the leader's decision, and the follower was faced with the classical maximum covering location. It is assumed that the follower used the greedy addition algorithm and formulated a single-level mixed-integer programming model that embedded the follower's response into the leader's constraints. The proposed model is verified and the condition of the optimal solution given. The model is also solved using the optimization solver Gurobi 6.5, which was able to generate suboptimal solutions for instances with 40 nodes in a short time. References | Related Articles | Metrics

A Comparative Study of Priority Rules for Mold Project Dynamic Scheduling LAI Kai, WANG Xiaoming, CHEN Qingxin, MAO Ning, CHEN Xindu 2017, 20 (5):  28-37.  doi: 10.3969/j.issn.1007-7375.e17-3035 Abstract ( 873 )   PDF (4007KB) ( 6207 )   Save The customization feature of mold product has allowed a great number of mold companies to utilize the project management methods for their production management. For the problem that optimal solution of mold project scheduling is hard to be obtained due to a large number of concurrent projects, random arrivals, limited resources and impacts of random events, the simple and effective classical priority rules were employed to get the approximate solution. To evaluate the performance of different rules, 15 priority rules which are suitable for mold project scheduling problem were selected and corresponding simulation experiment was designed based on randomly generated instances with the evaluation index of cumulative tardiness days, cumulative tardiness cost and cumulative tardiness project number. Experimental results show that the optimal rule will vary with the project environment and decision objective. The obtained conclusions are not only valuable for selecting reasonable priority rule to make scheduling decisions, but will also serve as a basis for the construction of effective mold project control strategy based on multiple rules combination. References | Related Articles | Metrics

An Analysis on the Synergetic Evolution of Chinese Pharmaceutical Industry Technology Innovation System XU Mengdan, ZHU Guilong, MA Wencong 2017, 20 (5):  38-44.  doi: 10.3969/j.issn.1007-7375.e16-1276 Abstract ( 768 )   PDF (327KB) ( 5834 )   Save Based on the perspectives of technology innovation value chain and complex systems theory, the Chinese pharmaceutical industry technology innovation system can be deconstructed into four subsystems of internal technology R&D, external technology acquisition, commercialization and innovation supporting environment, to understand the evolution state and rule of this system. Using the data of statistical yearbook from 2007-2015 and the synergy degree model of composite system, this system's synergy degree and its subsystems' ordering degree in the evolution process are measured and analyzed. The results show that this system's overall synergy degree and its subsystems' ordering degree show a dynamically rising trend as time goes on but their average values are low; technology external acquisition subsystem is the restriction factor for the synergy development of the whole system to the high level; the influencing weights of different order parameters on their respective subsystems' ordering degree are different; the significant polices for China's pharmaceutical industry may produce a clear short-term effect on the system's synergy development. Finally, some policy recommendations are made based on the above conclusions. References | Related Articles | Metrics

A Research on the Enterprise's Decision-making of Safety Input Based on the Prospect Theory LIU Suxia, XU Jianfei 2017, 20 (5):  45-50.  doi: 10.3969/j.issn.1007-7375.e17-4076 Abstract ( 916 )   PDF (482KB) ( 5959 )   Save Enterprise's safety input decision-making is the uncertainty decision making by limited rational people. First, based on prospect theory, the value function and decision weights function are built, and the prospect values of different decisions are calculated. Then, combining with the numerical simulation results of Matlab software, the influence of reference point, risk preference (avoidance), risk attitude to enterprise's safety input decision-making are analyzed. The results show that the reasons why enterprises choose safety violation programs is closely related to their reference point, security supervision and their own risk appetite (circumvention), risk attitude and so on when they are selected in safety input decision. Finally, the countermeasures are provided to promote enterprises to take safety compliance program rather than safety violation program. References | Related Articles | Metrics

A Comparative Study of the Topological Structure of Nanjing Metro Network Based on the Whole Perspective CAI Hong, XU Tengfei, ZHU Jinfu 2017, 20 (5):  51-57.  doi: 10.3969/j.issn.1007-7375.e17-2065 Abstract ( 774 )   PDF (1114KB) ( 5994 )   Save Based on the complex network theory, SpaceL topology models of 2016 and 2021 Nanjing Metro network were set up, and the indexes as node degree distribution, average shortest-path length, network diameter and degree of connectivity were adopted to make a comparative study of their structural property, according to planar characteristic of the metro network. The results showed that Nanjing Metro Network of 2016 and 2021 had scale-free property, and the scale-free factor were 4.2 and 3.7 respectively, and the “fat tail” was more obvious in that of 2021; both the degree of connectivity of 2016 and 2021 were below 0.4, plus the network average shortest-path length were not below the log of the number of vertex, so the network had no small-world property; according to betweenness, the key stations change a lot in 2016 and 2021. According to the results, it is proposed that it be necessary to combine the flow pattern with the network static structure to identify the key nodes, the line-covering area should also be considered when measuring the developing stage of the metro network. The research was fundamental endeavor to reveal the robustness, vulnerability, resilience of Nanjing Metro Network, and to optimize allocation of resources，and to strengthen risk management. References | Related Articles | Metrics

A Research on Multi-skill Worker Scheduling Strategy of MRO YANG Binbin, YE Chunming 2017, 20 (5):  58-65.  doi: 10.3969/j.issn.1007-7375.e17-2101 Abstract ( 800 )   PDF (722KB) ( 5958 )   Save MRO (maintenance, repair and overhaul) has become an increasingly important part of enterprise competitiveness. With regard to multi-skill employee scheduling problem of MRO multi-service centers, the multi-service center separate scheduling model and the multi-service center joint scheduling model are established with the aim of minimizing the total completion time. The model considers the match of employee's mastery of skills and task's skill requirements, and employees can use not only one skill in each task. Through the analysis of the model, it was found that when the number of tasks is fixed, the completion time and the number of workers change reversely; When the number of workers is certain, the task completion time and the number of tasks change in the same direction. When there are multiple service centers, the total scheduling time is less than that of the joint scheduling, which is mainly due to the increase of the transfer time and waiting time. The enterprise should take the separate scheduling strategy rather than joint scheduling strategy which can shorten the completion time and be more in line with the interests of the enterprise. References | Related Articles | Metrics

Improving Printing Quality of Chip Inductor Based on Orthogonal Experiment DAI Zonglian, YANG Lei 2017, 20 (5):  66-71.  doi: 10.3969/j.issn.1007-7375.e17-2105 Abstract ( 627 )   PDF (316KB) ( 5689 )   Save The main cause of product defection chip inductorlies in that the accuracy of printing process does not accord with the norm. Improving the printing precision is the key of production management. In view of the fact that printing preciseness is caused by many factors, an orthogonal experiment can be used to find the importance degree and reasonable level of factors, which can improve the process capability of printing. Applying this method to the printing of chip inductor in D Company, it is found that the order and the rational level of four factors and it concluded that: 1) the orthogonal experiment is effective in searching for quality improvement; 2) with the orthogonal experiment, the different degree of the four factors influencing printing preciseness is found, and the order is drying temperature> net height> speed> pressure; 3) the method can get the optimal parameters for better printing accuracy on chip inductor. The production capability of the chip inductor is improved obviously by using the optimal parameters. References | Related Articles | Metrics

An Evaluation of Overhead Transmission Line Status Based on Set Pair Analysis WANG Deyi, ZHAO Cheng, YANG Guoqing, JIA Rong, LI Ping 2017, 20 (5):  72-78.  doi: 10.3969/j.issn.1007-7375.e17-4056 Abstract ( 1391 )   PDF (352KB) ( 5986 )   Save It is the basic foundation for reconditioning the overhead transmission line to make the right evaluation of its status. The assessment indicator system is built based on the organizational structure and different types of mechanical faults in operation of overhead transmission lines. At the same time, a set pair analysis model is established based on set pair analysis when the status of overhead transmission line is unstable. Based on a full consideration of the balance among evaluation indicators and the influence of indicator changes, the analytic hierarchy process and entropy-weight method are used to calculate the comprehensive weight among all the indicators, and then each part and the whole system of overhead transmission line analyzed. At last, a case analysis proves the effectiveness of the new method which uses the set pair analysis method to evaluate the status of overhead transmission line. References | Related Articles | Metrics

An IT Outsourcing Schedule Risk Control Based on Improved Predatory Search LU Fuqiang, ZHU Wenjing, BI Hualing 2017, 20 (5):  79-86.  doi: 10.3969/j.issn.1007-7375.e17-4156 Abstract ( 859 )   PDF (1665KB) ( 5846 )   Save A two-level IT outsourcing schedule risk control model is proposed. For the two-level structure of the problem and the efficiency of Predatory Search (PS), the two-level structure and 2-opt based Tabu mechanism are introduced to propose a two-level tabu-predatory search (TLTPS) algorithm. During simulation examples, firstly, the simulation results are given. Secondly, five simulation experiments of different sizes are introduced to compare the ability of TLTPS, GA, PSO and PS, and verify the rationality and effectiveness of the improved algorithm. References | Related Articles | Metrics

A Research on Mechanical Reliability Assessment Based on Small Sample Failure Data SONG Mingshun, LU Wei, FANG Xinghua 2017, 20 (5):  87-93.  doi: 10.3969/j.issn.1007-7375.e17-4099 Abstract ( 1762 )   PDF (545KB) ( 6687 )   Save “Higher reliability, less failure” features of mechanical products or system make reliability assessment more difficult. To address this problem, an evaluation method of small sample of three parameter Weibull distribution is proposed based on the data of failure of mechanical reliability. Based on the determination of life distribution model, the failure data of small sample is estimated by using the grey estimation method, and the goodness of fit test is carried out, then Bayes prior distribution obtained by Monte Carlo sample as a parameter. On this basis, the three- parameter posterior distribution can be calculated by Bayes formula, and then the system reliability, failure rate and so on are derived, to evaluate the mechanical reliability of small sample failure data more accurately. The effectiveness of the method is verified by a practical example. References | Related Articles | Metrics

Process Improvement of Metro System Based on DMAIC and Simulation WANG Chenlin, LU Jiansha, ANZAI Kenji, LI Jiafeng, PAN Jianbiao 2017, 20 (5):  94-102.  doi: 10.3969/j.issn.1007-7375.e17-3132 Abstract ( 1083 )   PDF (1296KB) ( 5948 )   Save In order to shorten the waiting time of taking subway and alleviate the pressure of crowd, the Six-Sigma management DMAIC improving methodologies are applied, by means of definition, measurement, analysis and improvement process, through a field investigation and analysis of the current operation of the metro system. Emphasizing constructing control charts and sequence plots, the reasons for the excessively long waiting time, which lie within and outside the metro system, are deduced. Combined with IE methods, a systematic reform plan is presented comprising the ticketing system improvement, visual control layout management and flexible service. Simulation software is used to verify the effect. The study has proved that the reform plan has a 21% improvement on shortening waiting time, increasing service stability, raising worker utilization and balancing each workers' load. References | Related Articles | Metrics