Quality Control Along Supply Chain

Product quality is the core competitiveness of a brand, prompting brand-owner continuously to pursue. Learning curve is the tool to improve product quality by variance reduction. At the same time, knowledge depreciation with its negative effects attracts attention. Thus, a comprehensive learning curve is introduced in this dissertation. This research focus to explore the quality improvement along the supply chain. There are three contributions in this dissertation: 1) it provides the supply chain’s optimal distribution of quality improvement to manufacture and its suppliers; 2) it shows the benefit from coordinated quality improvement among the supply chain; 3) it illustrates the benefit from increased demand and decreased cost from quality improvement. Three models are presented consecutively in this dissertation. The first model assists the supply chain to coordinate all suppliers for quality investment. Based on the traditional learning curve, the comprehensive learning model is introduced in order to better understand the knowledge accumulation effect. Autonomous learning, induced learning and their respective knowledge depreciation effects are considered in this model. The product quality is measured from several aspects, and each aspect linearly depends on the component quality. Therefore, suppliers’ quality improvement contribute to the end product quality. The second model further considers each outsourced components have interaction effects. To better understand knowledge forgetting effect, it adopt Weibull distribution to simulate producing disruption. What’s more, it considers the optimal quality investment for the whole producing system and a suboptimal quality investment when there is no coordination in the system (Dyadic Supply Chain). Without coordination, every supplier is trying to save her own quality cost, but the total quality cost is higher than the coordinated system. Thus, incentives are necessary to these suppliers to cooperate in quality improvement. In addition, the second model provides existence proof of the optimal solution. Since the previous models using variance reduction to save cost, it increases demand as well. The third model starts to consider demand increasing and quality saving simultaneously. Similar to model 2, the third model compares the optimal quality efforts under the coordinated system and the sub-optimal quality efforts under un-coordinated system. Generally, the coordinated system is more efficient. With coordination, 1) marginality is eliminated; 2) cost is lower; 3) demand is higher from higher quality. Since supplier invest more with cooperation, incentives is required to all suppliers

Qualitative Case Studies in Operations Management: Trends, Research Outcomes, And Future Research Implications

Our study examines the state of qualitative case studies in operations management. Five main operations management journals are included for their impact on the field. They are in alphabetical order: Decision Sciences, International Journal of Operations and Production Management, Journal of Operations Management, Management Science, and Production and Operations Management. The qualitative case studies chosen were published between 1992 and 2007. With an increasing trend toward using more qualitative case studies, there have been meaningful and significant contributions to the field of operations management, especially in the area of theory building. However, in many of the qualitative case studies we reviewed, sufficient details in research design, data collection, and data analysis were missing. For instance, there are studies that do not offer sampling logic or a description of the analysis through which research out-comes are drawn. Further, research protocols for doing inductive case studies are much better developed compared to the research protocols for doing deductive case studies. Consequently, there is a lack of consistency in the way the case method has been applied. As qualitative researchers, we offer suggestions on how we can improve on what we have done and elevate the level of rigor and consistency

Outsourcing and Technological Change

We present a dynamic model where the probability of outsourcing production is increasing in the firm’s expectation of technological change. As the pace of innovations in production technologies increases, the less time the firm has to amortize the sunk costs associated with purchasing and adopting new technologies to produce in-house. Therefore, purchasing from market suppliers, who can afford to use the latest technology, becomes relatively cheaper. The predictions of the model are tested using a panel dataset on Spanish firms for the time period 1990 through 2002. In order to address potential endogeneity problems, we use an exogenous proxy for technological change, namely the number of patents granted by the U.S. patent office classified by technological class. We map the technological classes to the Spanish industrial sectors in which the patents are used and provide causal evidence of the impact of expected technological change on the likelihood and extent of production outsourcing. No prior study has been able to provide such causal evidence. Our results are robust to the inclusion of detailed characteristics of the firms as well as firm fixed effects.outsourcing, technological change

LEARNING FROM INTERORGANIZATIONAL PRODUCT FAILURE EXPERIENCE IN THE MEDICAL DEVICE INDUSTRY

Much research examines the causes of product failures such as the Ford Pinto gas tank design. Research also examines the consequences of product failures such as new product introductions resulting from the need to improve failed products. However, little is known about how the causes and consequences of product failures interact across different firms, and generate inter-organizational learning, within the same industry. Specifically, limited research has examined if a firm learns to reduce its own annual rate of product failures (e.g., experiences fewer product-related adverse events) by attending to the product failures and new product introductions of its competitors. In addition, we also do not know (1) how delayed reporting of product failure influences interorganizational learning, and (2) how the introduction of new products by one company impacts another firm’s effort to learn from this competitor’s product failures. To address these gaps, this dissertation develops and tests relationships between (1) inter-organizational learning from product failures, (2) product failure reporting delays, and (3) new product introductions. Regression analysis of 98,576 manufacturing firm-year observations from the medical device industry over a ten-year period (1998 to 2008) supports the proposed model. Specifically, the analysis supported two insights: (1) As expected, a competitor’s reporting delays can inhibit learning from others’ failures by increasing the chance of making poor inferences about the failure. Unexpectedly, however, delays can also improve inter-organizational learning because in reports that have taken longer to file, a clearer understanding of the failure’s cause-effect relationships is developed. iii (2) As expected, a competitor\u27s new product introductions positively impact interorganizational learning by transferring knowledge of product design between firms. Unexpectedly, a competitor’s new product introductions can also negatively impact inter-organizational learning from product failure by distracting the observing firm’s attention away from the competitor’s failures. The thesis contributes to the inter-organizational learning literature by: (1) modelling learning from others’ product failures, (2) highlighting the effects of reporting delays, and (3) showing how others’ new product introductions can distract. This thesis shows that learning from others’ product failures and new product introductions has significant benefits because it prevents serious injury and death among device users

Can stimulating demand drive costs down? World War II as a natural experiment

For many products, increases in cumulative production are associated with de- creasing unit costs. However, a serious problem of reverse causality (lower prices leading to increasing demand) makes it difficult to use this relationship for pol- icy. We study World War II, during which the demand for military products was largely exogenous, and the correlation between production, cumulative produc- tion and an exogenous time trend was limited. Our results indicate that decreases in cost can be attributed roughly equally to the growth of experience and to an exogenous time trend

How are Spanish academics coping with changes? Responses from a life histories research.

Podeu consultar la versió en català a: http://diposit.ub.edu/dspace/handle/2445/20983[eng] This report is part of the research project, The effects of social changes in work and professional life of Spanish academics, partially financed by the Spanish Ministry of Science and Innovation (SEJ2006-01876), that has explored change in legislation, organisation, research schemes and so on, in the last thirty years. The main aim of this project is deepening our understanding of the impact of undergoing economic, social, cultural, technological and labour change in Spanish universities in the life and professional identity of the teaching and research staff, taking into account the national and european context. This paper gathers part of the results gained from the project, being its primary objective to contribute to an improved knowledge-base on professional knowledge and work experience in higher education institutions in Spain and, as a consequence, to understand how Spanish academics are coping with current changes.[spa] Este documento forma parte de la investigación, Los efectos de los cambios sociales en el trabajo y la vida profesional de los docentes universitarios, parcialmente financiado por el Ministerio de Ciencia e Innovación (SEJ2006-01876), en el que hemos explorado los cambios en la legislación, la organización, los contextos de la investigación y la docencia, etc., en los últimos treinta años. El principal objetivo de este documento es profundizar en nuestra comprensión sobre el impacto del cambio económico, social, cultural, tecnológico y laboral que están experimentando las universidades españolas en la vida y la identidad profesional del personal docente e investigador, teniendo en cuenta el contexto nacional y europeo. Este trabajo recoge parte de los resultados obtenidos en el proyecto, siendo su principal objetivo contribuir a mejorar el conocimiento basado en la investigación sobre el saber profesional y la experiencia laboral en las universidades españolas, y en consecuencia, favorecer nuestra comprensión sobre cómo los académicos se están enfrentando con los cambios actuales.[cat] Aquest document forma part de la investigació, Els efectes dels canvis socials en el treball i la vida professional dels docents universitaris, parcialment finançat pel Ministeri de Ciència i Innovació (SEJ2006-01876), on hem explorat els canvis de la legislació, l'organització, els contextos d'investigació i docència etc., durant els darrers trenta anys. El principal objectiu d'aquest document és aprofundir en la comprensió de l'impacte del canvi econòmic, social, cultural, tecnològic i laboral que s'està experimentant a les universitats espanyoles en la vida i en la identitat professional de les persones docents i investigadores, tenint en compte el context nacional i europeu. Aquest treball recull part dels resultats obtinguts en el projecte, essent el seu principal objectiu contribuir a la millora del coneixement basat en la investigació sobre el saber professional i l'experiència laboral a les universitats espanyoles, i conseqüentment, afavorir la comprensió sobre com els acadèmics estan encarant els actuals canvis