Production technologies and financial performance: The effect of uneven diffusion among competitors   总被引：1，自引：0，他引：1  

Lucio Fuentelsaz  Jaime Gómez  Sergio Palomas 《Research Policy》2012,41(2):401-413

We explore the impact of a production technology on financial performance from the perspectives of technology diffusion and competitive strategy theory. We analyse how diffusion at firm and market levels influences the returns from the technology. We suggest that firm heterogeneity in the level of technology use leads to competitive advantages for relatively intensive adopters. We empirically test our propositions through the analysis of the diffusion of the Automated Teller Machine among Spanish savings banks between 1986 and 2004. Our results show that it is not the absolute but the relative level of use that drives the impact of the technology on profitability. Furthermore, as the technology is more intensively deployed in the market, the profitability of every firm decreases. Interestingly, in our empirical setting, this negative effect eventually leads to an aggregate negative impact on the profitability of the savings banks.  相似文献   

Quantitative analysis of Brazilian football players' organisation on the pitch     

Moura FA  Martins LE  Anido Rde O  de Barros RM  Cunha SA 《Sports biomechanics / International Society of Biomechanics in Sports》2012,11(1):85-96

The purpose of this study was to characterise Brazilian teams' coverage area and spread on the pitch while attacking and defending and to analyse the teams' organisation in tackle and shot on goal situations. We obtained the trajectories of 223 players in eight games with a tracking method. Team area was defined as the area of the convex hull formed by players' positions. Team spread was defined as the Frobenius norm of the distance-between-player matrix. We calculated teams' area and spread over time and in situations of shots on goal (n = 233) and tackles (n = 1897). While the players attacked, spread and area (median +/- confidence interval) ranged from 322.9 +/- 0.8 to 387.8 +/- 1.0 m and from 905.4 +/- 4.4 to 1407.6 +/- 5.5 m2, respectively. On defence, the values were smaller (p < 0.05) and ranged from 283.4 +/- 0.9 to 325.8 +/- 0.9 m and from 773.8 +/- 4.6 to 1158.4 +/- 5.5 m2 for the spread and the area. In defending circumstances, the teams presented a greater area and spread when they suffered shots on goal than when the teams performed tackles. In attacking situations, the teams presented a greater area and spread when they suffered tackles than when they performed shots on goal. The results allowed showing the attacking-defending interaction between Brazilian teams.  相似文献   

Improved similarity-based modeling for the classification of rotating-machine failures     

Matheus A. Marins  Felipe M.L. Ribeiro  Sergio L. Netto  Eduardo A.B. da Silva 《Journal of The Franklin Institute》2018,355(4):1913-1930

Similarity-based modeling (SBM) is a technique whereby the normal operation of a system is modeled in order to detect faults by analyzing their similarity to the normal system states. First proposed around two decades ago, SBM has been successfully used for fault detection in varied systems. In spite of this success, there is not much study performed in the literature regarding its design, that encompasses both similarity metrics and model training. This work aims at contributing with an in-depth study of SBM for fault detection considering these two design aspects. This is done in the context of proposing a novel system to identify rotating-machinery faults based on SBM, that is employed either as a standalone classifier or to generate features for a random forest classifier. New approaches for training the model and new similarity metrics are investigated. Experimental results are shown for the recently developed Machinery Fault Database (MaFaulDa) that has an extensive set of sequences and fault types, and for the Case Western Reserve University (CWRU) bearing database. Results for both databases indicate that the proposed techniques increase the generalization power of the similarity model and of the associated classifier, achieving accuracies of 98.5% on MaFaulDa and 98.9% on CWRU database.  相似文献   

Introduction to the Treatment of Non-Linear Effects Using a Gravitational Pendulum     

Klaus Weltner  Antonio Sergio C. Esperidião  Paulo Miranda 《Science & Education》2004,13(7):611-629

We show that the treatment of pendulum movement, other than the linear approximation,may be an instructive experimentally based introduction to the physics of non-lineareffects. Firstly the natural frequency of a gravitational pendulum is measured as functionof its amplitude. Secondly forced oscillations of a gravitational pendulum are investigatedexperimentally without limiting amplitudes. By this arrangement new phenomena, thebistability and the jump-effect, can be observed. In the case of bistability the drivengravitational pendulum can oscillate in two different stable modes. Either it oscillateswith a small amplitude and approximately in phase with the exciting torque or it oscillateswith a larger amplitude and approximately anti-phase. The jump effect is the spontaneoustransition from one mode of oscillation to the other. Both effects can be demonstrated andexplained.  相似文献   

Intervention in fluency problems in pupils with Specific Language Impairment (SLI) / Intervención en problemas de fluidez en alumnado con Trastorno Específico del Lenguaje (TEL)     

Víctor Acosta  Gustavo Ramírez-Santana  Sergio Hernández 《Infancia y Aprendizaje》2016,39(3):466-498

The aim of this research has been to prove the efficacy of an intervention programme on the problems of phonetic and semantic fluency and mazes in narrative discourse in children with Specific Language Impairment (SLI). The sample consisted of 34 children diagnosed with SLI and 34 children with normal language development. For the selection of the sample, the Clinical Evaluation of Language Fundamentals (CELF-3), Peabody Picture Vocabulary Test, Hearing Association and the Visual Association subtests of the Illinois Test of Psycholinguistic Abilities (ITPA), and the Kaufman Brief Intelligence Test (KBIT) were used. Performance in phonemes (F, A & S), semantic fluency (animals) and the appearance of mazes or repairs in a narrative task were also evaluated. The intervention programme consisted of 72 sessions of 15 minutes each, using phonetic and semantic fluency activities with phonetic and semantic clues. Differences between groups were statistically significant in repetitions and false connectors.  相似文献   

Interfaith education: An Islamic perspective     

Yahya Sergio Yahe Pallavicini 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》2016,62(4):423-437

  相似文献   

W5″ Test: A simple method for measuring mean power output in the bench press exercise     

Julio Tous-Fajardo  Gerard Moras  Sergio Rodríguez-Jiménez  Albert Busquets  Iñigo Mujika 《European Journal of Sport Science》2016,16(8):940-947

The aims of the present study were to assess the validity and reliability of a novel simple test [Five Seconds Power Test (W5″ Test)] for estimating the mean power output during the bench press exercise at different loads, and its sensitivity to detect training-induced changes. Thirty trained young men completed as many repetitions as possible in a time of ≈5?s at 25%, 45%, 65% and 85% of one-repetition maximum (1RM) in two test sessions separated by four days. The number of repetitions, linear displacement of the bar and time needed to complete the test were recorded by two independent testers, and a linear encoder was used as the criterion measure. For each load, the mean power output was calculated in the W5″ Test as mechanical work per time unit and compared with that obtained from the linear encoder. Subsequently, 20 additional subjects (10 training group vs. 10 control group) were assessed before and after completing a seven-week training programme designed to improve maximal power. Results showed that both assessment methods correlated highly in estimating mean power output at different loads (r range: 0.86–0.94; p?R²: 0.78). Good to excellent intra-tester (intraclass correlation coefficient (ICC) range: 0.81–0.97) and excellent inter-tester (ICC range: 0.96–0.99; coefficient of variation range: 2.4–4.1%) reliability was found for all loads. The W5″ Test was shown to be a valid, reliable and sensitive method for measuring mean power output during the bench press exercise in subjects who have previous resistance training experience.  相似文献   

A virtual environment for process management. A step by step implementation     

Sergio Valenzuela Mayer 《European Journal of Engineering Education》2003,28(4):465-481

In this paper it is presented a virtual organizational environment, conceived with the integration of three computer programs: a manufacturing simulation package, an automation of businesses processes (workflows), and business intelligence (Balanced Scorecard) software. It was created as a supporting tool for teaching IE, its purpose is to give professors and alumni the possibility to practice and apply the concepts and knowledge of IE learned at school since the very beginning of the program. This environment allows perform many business processes functions of management; it is already running in both, Local Area Network and Internet. With this system running in a network, it is emulated the functioning of an organization, in which it is necessary a coordination of multiple actions for making decisions in a collaborative and integrated manner. The work developed in this virtual atmosphere permits the participants to face non structured problems, and also it is possible to develop their own skills and aptitudes for being a good professional. The Virtual Enterprise is managed by a Management Committee, formed by high level alumni and invited professors; they have the responsibility of achieving the productivity levels necessary to its own economic profit. The Intermediate courses alumni are in charge of the resources evaluation utilization. The lowest level alumni are in charge of Data Acquisition and feeding the Data Base. The Virtual Enterprise compromises the Industrial Engineering School as a whole, and all the students feel their belonging since the first courses, it motivates them to search for the knowledge and desire to be an Industrial Engineer.  相似文献   

Determinants of the job satisfaction of PhD holders: an analysis by gender,employment sector,and type of satisfaction in Spain     

Josep-Oriol Escardíbul  Sergio Afcha 《Higher Education》2017,74(5):855-875

We analyze the determinants of job satisfaction of PhD holders in Spain. Specifically, we consider overall job satisfaction as well as basic and motivational satisfaction, following Herzberg’s typology (based on Maslow’s hierarchy of needs). Using representative data for Spain’s PhD population—collected from the Spanish Survey on Human Resources in Science and Technology (2009)—we report an analysis by gender and the institutional sector (university and non-university) in which employees work. We employ Ordinary Least Squares (OLS) regressions to identify the determinants of basic and motivational satisfaction in the workplace and an ordered logit model for overall job satisfaction. Results do not allow us to confirm Herzberg’s factor differentiation for Spanish PhD holders since the factors of basic motivation (including salary or working conditions—needs of “safety”) have a bearing on all types of job satisfaction (and not solely on the basic satisfaction of PhD holders). Our results do not show any significant differences by gender. However, it seems that meeting these “basic” needs is less important for the job satisfaction of PhD holders working in universities. The results seem reasonable in a Southern European country where the monetary conditions of the labor market are worse than those in other developed countries.  相似文献   

The functions of models     

Gallegos  Sergio A. 《Metascience》2017,26(1):103-106

  相似文献