Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

With people’s increasing concern about food safety, cold-chain logistics distribution centre is playing an important rolein preventing food from going bad. Now cold-chain logistics distribution centres have the problems of too muchtransportation, low degree of automation, unreasonable layout planning, complex distribution process etc. It isimportant to solve these problems in order to achieve efficient distribution. Firstly the modeling and simulation for theoperation process of a fruits and vegetables cold-chain logistics distribution centre by using Flexsim software isrealized. Then the paper analyses the preliminary output data and finds out the bottleneck and idle resources. Finallythis paper makes adjustments for the system to get a better result which hopes to give a reference for the modelingand simulation for the operation process of other cold-chain logistics distribution centres.

The scheduling method of shiplock has a strong influence on the improvement of shiplock capacity. On the conditionthat the number of the ships waiting for the lock was relatively stable, the paper constructed an optimization model forjoint scheduling of double line shiplock based on the nonlinear goal programming. The hard constraints included thatthe number of ships arranged in the shiplocks couldn't exceed the number of the ships waiting for the lock. The softconstraints included arranging the ships with the priority and time limit as far as possible, and maximizing the utility ofthe lock chambers. Then the objective function was constructed. Considering the characteristics of the nonlinear goalprogramming mode, the Hooke – Jeeves algorithm was used to solve the model. In the end, a double line shiplock ofJiangsu province was taken to verify the scientificity and feasibility of the model.

The evolutionary game of co-opetition relationship between regional logistics nodes is studied in this paper. Areplicator dynamic model is built to obtain the Evolutionary Stable Strategy (ESS) of the game. Then, according to thestatus and level of logistics nodes, the symmetric and asymmetric game models based on evolutionary game theoryare proposed, respectively. The former is used to analyze the changing trends of co-opetition relationship betweenlogistics nodes from a same layer of a logistics network. While the latter can be used to deal with the relationshipforecasting problems between logistics nodes from different layers. The result of the case study reveals that theproposed models have good practicability and accuracy in dealing with the relationship forecasting problems within aregional logistics network.

This article analyzes the food cold chain (FCC) equilibrium based on collaborative replenishment policy. The entiretyof collaborative replenishment (ECR) includes one supplier, one retailer and one consumer. The two players join inthe non-cooperative game. Both of them pursue their own ideal benefits and achieve the equilibrium in terms of foodquantity and price. A new iterative algorithm based on the theory of fixed point is designed to improve the equilibriummodel. A numeric example was set to identify the applicability of the model. The parameter sensitivity analysis showsthat the overall profit of ECR will increase with consumers’ demand, while the customer satisfaction will decrease tosome extent when the food deterioration rate and shortage cost increase, the overall profit of ECR will decrease. Wefind that the former leads to decreasing of the customer satisfactory and the latter do the opposite. Appropriatestrategies should be chosen based on the actual situation for each equilibrium subject.

This paper studies an online retail supply chain that includes one referral infomediary and one retailer, in which theinfomediary provides demand referral service to retailers and incentive rebates to customers. A linear dual-channeldemand with the effect of customer incentive and horizontal service cooperation model was established, and then theoptimal policies of infomediary and retailers in centralized and decentralized supply chain were analyzed. Moreover, ahorizontal cooperation contract based on customer incentive cost as well as referral service price was developed tocoordinate the supply chain. The results revealed that the contract contributed to profit optimization of online retailsupply chain and effective win-win cooperation. Finally, we analyze the impact of rebate sensitivity and market shareon these optimal policies and illustrate the results by some numerical examples.

AnaPro is software that solves direct anaphora in Spanish, specifically pronouns: it finds the noun or group of words towhich the pronoun refers. It locates in the previous sentences the referent or antecedent which the pronoun replaces.An example of a direct anaphora solved is the pronoun “he” in the sentence “He is sad.” Much of the work onanaphora has been done for texts in English; thus, we specifically focus on Spanish documents.AnaPro directly supports text analysis (to understand what a document says), a non trivial task since there aredifferent writing styles, references, idiomatic expressions, etc. The problem grows if the analyzer is a computer,because they lack “common sense” (which persons possess). Hence, before text analysis, its preprocessing isrequired, in order to assign tags (noun, verb,…) to each word, find the stems, disambiguate nouns, verbs,prepositions, identify colloquial expressions, identify and resolve anaphora, among other chores.AnaPro works for Spanish sentences. It is a novel procedure, since it is automatic (no user intervenes during theresolution) and it does not need dictionaries. It employs heuristics procedures to discover the semantics and help inthe decisions; they are rather easy to implement and use limited knowledge. Nevertheless, its results are good (81%of correct answers, at least). However, more tests will give a better idea of its goodness.

We use multimode interference (MMI) as an alternative optical technique to estimate lithium bromide (LiBr)concentration, of the work pair LiBr-H2O, in absorption heat pumps (AHP). The sensing element is a singlemodemultimode-singlemode (SMS) fiber optic structure. This is fabricated by splicing a precisely dimensioned multimodefiber (MMF) section between two singlemode fibers (SMFs). The operation principle is based on the multimodeinterference (MMI) effect occurring in the MMF section. For that purpose, different concentrations of the mixture wereprepared (from 44.30% to 60.69%) to study their optical response. The input field profile entering the sensing element,which is the naked (no cladding) MMF section of the SMS fiber structure, produced different transmitted intensityresponses for each of these concentrations. Thus the optical characterization of the mixture was used to establish amathematical relation to estimate the LiBr concentration. A linear fit for solutions with concentrations ranging from43.30% to 50.87% and refractive indices between 1.421 and 1.439 is demonstrated.

Based on simulations of the transports of a typically formed Chinese intercity passenger train hauled respectively bymajor types of the locomotives on a certain railway line in China, this research analyzes the changes of the tractionenergy cost intensity and passenger transport efficiency of the train with varying its passenger capacity utilization rateand target speed. It is found that if the passenger capacity utilization rate of such a train is higher than 60.00%, theeffect of its passenger capacity utilization rate and target speed on its traction energy cost intensity and passengertransport efficiency is relatively very small. In contrast, if the passenger capacity utilization rate of the train is reducedfrom 40.00%, the efficiencies of its traction energy cost and passenger transport both decrease obviously and suchdecreases are evidently affected by its target speed. Therefore, strictly preventing the passenger capacity utilizationrate of a conventional intercity passenger train from decreasing from 40.00% in particular and meanwhile striving tomake its passenger capacity utilization rate higher than 60.00% as new evaluation benchmarking are able toeffectively improve the railway passenger transport operation management in China.

This study is concerned with the replenishment-shipment decision for a multi-customer finite production rate (FPR)model with quality assurance and discontinuous deliveries. We consider that a product is manufactured by a producerand all items are screened for quality control purpose. Nonconforming items will be picked up and categorized asscrap or repairable items. The reworking will be done right after the regular production in each replenishment cycle.After the entire lot is quality assured, multiple shipments will be delivered synchronously to multi-customer in eachcycle. Each customer has its own annual product demand, unit stock holding cost, as well as fixed and variableproduct delivery costs. Mathematical modeling along with Hessian matrix equations is employed to solve the proposedmodel. A closed-form optimal replenishment-shipment policy for such a specific integrated FPR model is obtained. Anumerical example is provided to show the practical applicability of the obtained results.

This paper investigates how to control cost of inventory by analyzing the impact of speculation in a dual-supply chain.Manufacturers’ exploit both traditional channel and direct channel independently to deliver goods. A four view Markovchain model was used to formulate total cost performance, with replenishment of inventory in accordance to Poissonprocess. Our numerical calculations divulge these findings, in the long run; (i) increasing speculation with increasingforeign search rate, rises warehouse lost sales (ii) increasing speculation, increasing local and foreign search ratewith increasing total cost components results in holding cost diminishing aiding collapse of manufactures’ product, (iii)as local, foreign or both search rate increase; (a) holding cost at warehouse and retailer remains constant butdiminishes in its percentage contribution to total cost, (b) lost sales cost at warehouse keeps rising, and (c) ourproposed two-echelon dual-supply chain may perform better than single supply chain, and (iv) increasing local andforeign search rate against increasing total cost components, escalate total cost. According to the authors, the issueat hand is: speculation impact on total cost not only creates opportunities for manufacturers to expand their productsand gain profit but also produces a hazardous side-effect for it can collapse the product.