An inventory model with non-resuming randomly interruptible lead time

We assume that an unreliable supplier in a single-item stochastic inventory system alternates randomly between two possible states (i.e., available and unavailable), following a two-state continuous-time homogeneous Markov chain. For a compound Poisson stream of demands and Erlang lead times, our model considers the scenario where the processing of the outstanding order (if any) is interrupted at every supplier's transition epoch from the available to the unavailable state, and is restarted from the outset upon the supplier's regaining its available state. We derive the stationary distribution of the on-hand inventory under a continuous-review policy and provide some numerical results.     

Managing opportunism in a developing interfirm relationship: The interrelationship of calculative and loyalty commitment

This research develops a framework for investigating associations among the duration of an exchange relationship, the interrelationship between a supplier's calculative and loyalty commitment, and opportunistic behavior on the part of a buyer. The findings indicate that (1) calculative commitment and loyalty commitment by suppliers function as substitutes; (2) a supplier's loyalty commitment increases gradually as a developing exchange relationship endures, whereas calculative commitment increases and then decreases; and (3) a supplier's calculative commitment leads to an increase in a buyer's opportunism, whereas the supplier's loyalty commitment leads to a decrease, and a supplier's loyalty commitment decreases the positive impact of calculative commitment on opportunism. These findings provide insights into how relationship duration affects buyers' opportunism through the interrelation between suppliers' calculative and loyalty commitment.     

Managing supplier-retailer relationships: From institutional and task environment perspectives

This study develops an integrated model of managing channel relationships that involves task and institutional environment perspectives. Using survey data from automobile dealers in China, the authors provide empirical evidence to demonstrate the utility of the legitimacy-based institutional environment perspective in clarifying channel relationship issues, which have been considered mostly only from an economic efficiency-based task environment approach. As the institutional environment perspective's factors, imposition asymmetry and bypassing have indirect impacts on trust in supplier and the level of conflict in a channel relationship. As the task environment standpoint's factors, explicit contracts and supplier's transaction-specific investments (TSIs) are posited to have direct effects on trust in supplier and the level of conflict, however, the hypothesized relationship between supplier's TSIs and the level of conflict is not supported. The results also indicate both building a retailer's trust in its supplier and lowering the level of conflict lead to improved relationship performance.     

Agents’ incentives under buy-back contracts in a two-stage supply chain

This paper investigates how the behavior of individual decision makers can affect the performance of a supply chain. We study a two-stage supplier–retailer system, using a buy-back contract. Each firm's actions are executed by an agent. The retailer's purchasing agent and the supplier's sales agent are compensated based on certain performance measures, and they act accordingly. We study the impacts of their behavior in both the supplier-as-leader and retailer-as-leader settings. We find that, unless their incentives are carefully constructed, the agents can strongly distort the system's behavior. Specifically, “channel stuffing” (packing the distribution channel with excess inventory) can occur in both settings. Only when the agents are compensated based on net profit do they act in accord with their firms’ objectives. These results may help explain some recent scandals.     

The role of mobile handsets in advanced network service evolution: Evidence from Japan

This paper aims at a better understanding of the mechanisms of mobile network service evolution through a closer examination of the context of mobile handsets. It aims first to establish quantitatively that mobile handsets are a determinant of mobile network service evolution patterns, and second, to develop a consistent perspective capable of explaining the evolution of various mobile network services. Despite the fact that mobile handsets are indispensable to users of mobile network services, surprisingly little is known about the role of these handsets in mobile network service evolution. This paper provides quantitative evidence of a positive relationship between intra-network-carrier penetration rates for mobile network service subscribers and mobile handsets designed for these services. The relationship is such that if one network service is diffused more than another, the mobile handsets related to the more diffused service are similarly more widely diffused in the market, and vice versa. The evidence is derived from an analysis of two mobile network services in Japan, mobile Internet and third generation mobile, initiated by NTT DoCoMo and KDDI. There are no existing studies that consistently explain the mechanisms of different mobile network service evolution patterns. Since the positive relationship that emerges from the analysis is consistent for both cases, by examining the mechanisms underlying this relationship, the paper develops an adequate and consistent perspective based on a constituent model reflecting the technological and competition structure of mobile network services. From this perspective, this positive relationship can be explained as the similarity or dissimilarity in essential technology ownership distribution across constituents. This perspective describes mobile network evolution in terms of changes in the distribution of essential technology ownership and, therefore, could be generalised more widely.     

Strategic cost management across boundaries of firms

In recent years, increasing attention has been placed on how purchasing strategies may contribute to the efficiency of firms. In this paper, a case study illustrates how one firm implemented a supplier base reduction to enable a high involvement strategy in relation to appointed key suppliers. The effects of this change in purchasing strategy were extensive cost rationalisations. The main change in this process was a redefinition of the unit of analysis from individual transactions to buyer-supplier relationships. However, the costs in the relationship are driven not only by internal factors on the two sides of the relationship but also by how the focal relationship relates to other relationships. Therefore, the ways in which the costs are affected by other parties, such as the supplier's supplier, the supplier's other customers, the customer's other suppliers, and the customer's customers, need to be included in the analysis.     

The effect of supplier's market orientation on manufacturer's trust

Recent studies show that manufacturing firms can select suppliers according to suppliers' market-oriented behaviors. Based on market orientation literature and research on inter-firm relationships, a model is developed to examine the impact of supplier's market orientation on manufacturer's trust. The framework is tested using Structural Equation Modeling and the data are from dyadic manufacturer and supplier relationships in U.S. firms. The results show that supplier's market orientation is significantly related to manufacturer's trust, which affects the manufacturer's long-term orientation toward the supplier. Discussions and implications for managers are presented at the end of the article.     

Call centers with hyperexponential patience modeling

An important feature in call center modeling is the presence of impatient customers. In this paper we show, using real data, that we can realistically model the patience distribution by the hyperexponential distribution. Since the hyperexponential distribution is a mixture of exponential distributions, an analytical Markov chain analysis is performed. A framework is developed in order to compute all kinds of practical service levels. This framework utilizes the recursive relation between the queue lengths at successive service completion epochs. Our approach shows overall better performance compared to current algorithms. Moreover, the computation times are short and our approach can therefore readily be applied in practice.     

System supplier's customer strategy

The article addresses the management of dynamic customer relationships in large-scale, complex system business. It combines the existing knowledge on system business, high-tech services and buyer-seller relationships with an international multiple case study. As a result, we produce a framework model, which provides the answers to the following critical questions: What are the key activities through which a system supplier provides value for the customer? What are the system supplier's roles for the customer? How does the customer's strategy and capabilities influence the customer's need for the supplier's activities and its evaluation of potential suppliers? And, how does the stage of the supplier-customer relationship and the system's technology cycle influence the customer's perceived need for the supplier's activities? In sum, the framework model provides a major theoretical contribution to more profoundly understand and manage complex system supplier-customer relationships.     

Product substitution in different weights and brands considering customer segmentation and panic buying behavior

Due to recent supply disruptions, there has been a rapid increase in panic buying. This study considers a wholesaler selling two brands of a product with multiple weights and produced by different manufacturers to multiple retailers. The products are substituted based on weight (same brand) and a competitor’s brand over two periods. In the first period (panic situation), the wholesaler attempts to retain the inventory to satisfy the retailer. In the second period (supply disruption), retailers are willing to accept the substitute products. The wholesaler segregates the retailers into high and low indexed customers, where the high indexed retailers (provide higher profit) order greater quantities than the low indexed retailers. The objective of this model is to determine the optimal numbers for ordering quantities and substitutions to maximize total profit. Moreover, supply disruption for both single and multiple brands is analyzed, along with the influence of different degrees of supply disruption and panic rate on decisions and profits. Finally, we compare the models with and without customer-segmented substitution and brand substitution. In addition, other model extensions are discussed, such as an increase in the price in the second period.     

Value creation in the relationship life cycle: A quasi-longitudinal analysis

Among the growing literature on value creation in collaborative buyer-seller relationships, most researchers examine relationship value at a single point in time. In the present research, we explore whether different stages of the relationship life cycle moderate the relative importance of value-creating dimensions. To shed light on the dynamic nature of value in B2B relationships, we present the results of a survey among purchasing managers using a quasi-longitudinal research design. Our findings confirm the moderating role of the relationship life cycle in value creation. More precisely, our results indicate that a key supplier's potential for value creation in customer's operations increases in relative importance as relationships move through the life cycle. In turn, supplier's capabilities to create superior value at the level of the customer's sourcing process display a decreasing role over the life cycle of a business relationship. No significant link was found in the present study between value creation through a supplier's core offering and different stages of a buyer-seller relationship.     

Design and application of task administration protocols for collaborative production and service systems

This research investigates the design of Task Administration Protocols (TAPs) for effective task allocation and administration in collaborative production/service systems. Customer-focused and concurrent engineering service systems process tasks more effectively as a result of the power of collaboration among multiple participants. In such environments, however, complex situations might arise that require decisions that cannot be handled by simple Coordination Protocols (CPs). To design an effective control mechanism to manage complex situations, this research identifies basic problems in collaborative task administration and proposes the design framework of protocols to solve the problems. In the framework, TAPs consist of three component-protocols: (1) Task Requirement Analysis Protocol, (2) Shared Resource Allocation Protocol, and (3) Synchronization and Time-Out Protocol. Each component protocol is activated to address priority-based allocation, resource-aware allocation, and task re-allocation at a different task administration context, ranging from task initialization, task allocation, to task monitoring, respectively. To analyze feasibility and effectiveness of the proposed design, TAPs are applied to two collaborative production/service systems. Simulations are conducted to evaluate the performance achieved by different TAPs and non-TAP CPs under various load conditions. The results show that there is a significant performance improvement by TAPs over CPs in most cases, e.g., 84% vs. 64% in terms of task completion ratio. The advantage of TAPs can be explained by their design with relatively higher level of collaborative intelligence, addressing more complex control logic than non-TAP CPs.     

社区居家养老服务机构绩效评估研究——以上海市为例

以上海市A居家养老服务中心为例,运用平衡计分卡理论构建4类15项的居家养老服务中心的评估指标体系;然后运用AHP——模糊综合评价法对A居家养老服务中心绩效进行定性和定量综合评估。实证分析表明,上海市社区居家养老服务机构的绩效水平并不高。期望本文评估方法可为社区居家养老服务机构提高服务绩效提供一定的借鉴。     

Success Factors for Service Innovation: A Meta‐Analysis

Service sectors form a considerable part of the world economy. Contrary to the logical assumption that service innovation research should represent a significant share of all innovation research, the vast majority of innovation studies focus on products as opposed to services. This research presents a meta‐analysis of the antecedents of service innovation performance conducted on 92 independent samples obtained from 114 articles published between 1989 and 2015. This research contributes to our understanding of service innovation in three major ways. First, this is the first meta‐analysis that specifically assesses the relative importance of antecedents of service innovation performance, while also pinpointing the differences in meta‐analytic findings between antecedents of service and product innovation performance. Although there are some universal success factors that transcend the boundaries between services and products, the presence of marked differences implies that it would be wrong to treat the development of new services and new products as the same. Second, the meta‐analysis demonstrates that the antecedents of service innovation performance are contingent on the sector context (i.e., explicit versus tacit services). Comparing results between products and services, and between tacit and explicit services, there appears to be a continuum where explicit services sit interstitial between tacit services on one side and products on the other. Third, the meta‐analysis compares and contrasts the antecedents of two dimensions of service innovation performance (i.e., commercial success and strategic competitive advantage). Previous meta‐analyses treated these two dependent variables collectively, which falls short of identifying issues that may affect management decisions when faced with different objectives. Additionally, this research investigates the effect of several other moderators (i.e., culture, unit of analysis, journal quality, and year of publication) on the relationships between the antecedents and service innovation performance. The results are discussed in relation to their implications for research and managerial practice.     

Publication of Information and Market Response: The Case of Airline on Time Performance Reports

This paper investigates market response to publication of on time performance information. Theory suggests that reduction in search costs generates more honest airlines and better quality service, a distribution of price-quality bundles, increased demand, exit by inefficient airlines and reduction of price rigidity. An ARIMA study of U.S. domestic airline operations finds that after publication of performance information the market generated better performance, increased quality distribution, enhanced demand, exit by four of fourteen airlines and reduced price-quality rigidity. Publication of information may improve performance in markets characterized by asymmetric information and high search costs.     

Pivotal Buyers and Bargaining Position

Securing sales to a large buyer can be pivotal to a supplier's decision to produce. While conventional wisdom suggests that being pivotal improves a buyer's bargaining position, the opposite is shown in a multilateral bargaining model. If other buyers' payments fall short of costs, a pivotal buyer must cover the shortfall or forfeit consumption. This affords leverage that the supplier lacks when bargaining with non-pivotal buyers. The analysis illuminates contracting in markets with high fixed costs, such as cable television programming, motion pictures, and large-scale project finance, and has implications for the FCC's horizontal ownership limits on cable system operators.     

基于材料性能劣化的RC框架结构抗震性能评估及易损性分析

为了提高钢筋混凝土(reinforced concrete, RC)框架结构的使用寿命,明晰长期服役后的材料劣化对结构抗震性能和易损性的影响程度,建立了考虑材料性能劣化的RC框架结构的有限元分析模型。选取材料性能未劣化(100%)以及分别劣化至90%,80%和70%时的4种工况(依次表示为flsc-100,flsc-90,flsc-80和flsc-70)进行抗震性能评估,同时绘制地震易损性曲线,并分析其在不同地震强度作用下的易损性。结果表明：1)随着材料劣化程度的加剧,RC框架结构在不同地震波下的抗震性能明显降低。罕遇地震作用下,flsc-70的层间位移角比flsc-100增大了80%;2)随着结构刚度及承载力的降低,RC框架结构在不同破坏状态下的超越概率均有显著提升。罕遇地震作用下,flsc-90,flsc-80和flsc-70发生严重破坏的超越概率比flsc-100分别增大了75%,300%和975%。因此,在既有结构抗震性能评估中考虑材料性能劣化的影响十分必要。研究结果可以帮助预测材料性能劣化的RC框架结构在地震发生时的损伤程度,为结构的加固及修复提供参考依据。     

Business suppliers' value creation potential : A capability-based analysis

Joint value creation through partnering and networking is a topic of current interest. This paper proposes that the dimensions of the supplier's value creation in a supplier-customer relationship could be classified according to efficiency, effectiveness and network functions. These functions are interrelated, but they are conceptually distinct. The value creation process could be described as a spectrum ranging from core value, to added value, to future value. The value-producing potential of a supplier can be assessed reasonably well only in the case of the core value, where there is sufficient benchmarking information in the form of existing alternative offerings and solutions. A priori evaluation of the costs and benefits of added value and, especially, future value projects is problematic, because the realisation of the value is dependent on the development of multiple partners, technologies and industries. In these cases, we suggest that a customer could use a supplier's capability profile as an indicator of how suitable that particular supplier is for specific value creation projects. A framework connecting specific capabilities to different types of value production is suggested, and its managerial implications are discussed.     

Managing international supply: The balance between total costs and customer service

Many trading companies have taken a global approach to their supply markets, sourcing from low-cost foreign countries in order to achieve cost reductions. There remains, however, a lack of evidence that sourcing internationally actually leads to improved economic performance. This can be explained by two key challenges in terms of how to achieve a balance between: (1) purchasing and logistics costs, and (2) customer service. The purpose of this paper is to examine the organisation and management of international supply from a total cost perspective, taking into account both purchasing and logistics costs, as well as customer service and agility. Previous research into a number of Norwegian companies that have sourced from China has identified four configurations for managing international supply. This paper utilises the supply management literature and an example of a Norwegian retail and wholesale company to analyse and discuss these configurations and their effects on total costs and customer service. The paper's theoretical contribution is the conceptualisation of a total cost perspective on international supply management and the discussion of such costs in relation to customer service. This contribution may, in turn, aid companies that source from foreign, low-cost countries.     

Retailer entry conditions and wholesaler conduct: The theatrical distribution of motion pictures

I add to the empirical literature on vertical contracting and wholesaler conduct by using retailer entry conditions to infer unobserved choice variables and equilibrium responses to prices and advertising. After estimating the US demand for theatrical motion pictures from 1990–96, I apply these techniques to compare observed outcomes to predictions under various distributor-conduct hypotheses. While several caveats apply, results indicate that the hypothesis of competition among distributors fails to describe advertising levels or aggregate payments of theaters to studios. The hypothesis of some collusion among distributors, however, matches the data fairly well.