Steel structure enterprises, belonging to domestic-oriented industry, are capital intensive and skill intensive as well. The ability of huge fund deployment and excellent project management is the key for such kind of enterprises to survive in the competitive environment due to the low entry barrier and little profit margin. The cost of the material accounts for the most, usually the greatest proportion of the total contract, in an entire steel structure project. Therefore, the profit in general depends heavily on the quality of material management. In this thesis, we propose Architecture Oriented Steel Structure Material Scheduling Model (AOSSMSM), to capture the current material inventory, reduce the remaining stock, improve the circulation and substitutability, and increase the profit. AOSSMSM constructs system architecture which includes enterprise architecture and software architecture, therefore highlights material¡¦s service and interaction among culture value chain in enterprise and integrates with information application system. By duplication and expansion characteristics of system architecture, AOSSMSM can be replicated effortlessly by other steel structure companies, or bridged to other models to create a new operational formation.

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In 1988 Information Power: Guidelines for School Library Media Programs (IP1) was published. Ten years later an updated version, Information Power: Building Partnerships for Learning (IP2) was released. The purpose of this study was to determine if school library media specialists' perceptions had changed since 1996 and if respondents' familiarity with IP2 was a factor in the development of those perceptions. Further, 37 items that were clustered based on the three primary threads of collaboration, leadership and technology developed in IP2 were used to assess changes in perceptions. An electronic survey was developed and disseminated to the population of school library media specialists in Florida. A total of 454 completed surveys were received; representing a 17% return rate. The results of the current survey were then compared to a 1996 job task analysis study. Analysis of the results showed that 60% of the respondents had never attended an in-service on IP2. Statistically significant changes in perceptions about the importance of those 37 job tasks resurveyed were also identified. Changes were identified in 10 of the 14 collaboration items, 12 of the 13 leadership items and 9 of the 10 technology items. Changes in perception were also found for tasks that the respondents considered not a part of job. For the 37 job tasks, there were 11 statistically significant positive changes and two statistically significant negative changes. The environmental variable that correlated with the largest number of the 37 job tasks related to the principal making encouraging comments to classroom teachers about using the resources of the school library media center in the planning of their curriculum units. This variable correlated significantly with 24 of the 37 job tasks. The study revealed a need for additional research in the leadership roles and traits of the school library media specialist. Further, additional research related to the effect of administrative support could inform the profession in its efforts to solidify the school library media program as an integral part of the instructional program.

Les travaux présentés dans cette thèse portent sur la conception d’une méthodologie d’ordonnancement/optimisation pour les systèmes de production à grande variété de produits et faible densité de flux appelés systèmes HVLV (High-Variety, LowVolume). Les caractéristiques de ces systèmes nous permettent d’appréhender la représentation des flux y circulant par un modèle discret. Le comportement discontinu des systèmes HVLV peut être caractérisé par la connaissance des dates de début et de fin des activités de production. L’algèbre (max, +) est utilisée pour représenter ce type de systèmes où les relations entre les dates de début des activités nécessitent l’utilisation des opérateurs maximum et addition. Afin d’utiliser l’algèbre (max, +) pour l’ordonnancement des systèmes HVLV, il est indispensable de résoudre un problème de conflit et d’optimisation sous contraintes dans cette algèbre. D’abord, nous avons développé dans ces travaux de recherche un modèle d’ordonnancement (max, +) pour les systèmes HVLV dans lequel des variables de décision ont été introduites afin de résoudre le problème de conflit entre les opérations exécutées sur les machines. Ensuite, nous avons amélioré le modèle proposé pour tenir compte de la maintenance préventive. Deux types de maintenance ont été considérés : Maintenance Périodique Répétitive (MPR) et Maintenance Flexible Périodique (MFP). Dans les deux cas, un problème d’ordonnancement non-linéaire sous contraintes a été résolu afin de minimiser certains critères de performance. Enfin, la méthodologie proposée a été validée par simulation, sur des systèmes HVLV complexes de type job-shop. / This thesis deals with the development of a flow scheduling/optimization approach applied to the field of high-variety, low-volume production systems called HVLV (HighVariety, Low-Volume) systems. In this context, the flow of parts is represented by a discreet flow model. The discontinuous behavior of HVLV systems can be characterized by the knowledge of the starting and ending times of its activities. (Max, +) algebra is used to represent these kinds of systems where relationships between the starting times of the activities require both the maximum and addition operators. In order to use (max, +) algebra for HVLV systems scheduling, it is necessary to solve into this algebra an optimization problem subject to conflicts and constraints. In this research, we have first of all developed a scheduling (max, +) model for HVLV systems where decision variables are introduced to solve the conflict problem between operations carried out on the machines. Then, we have improved the proposed model to deal with preventive maintenance. Two kinds of maintenance are considered: Repetitive Periodic Maintenance (RPM) and Flexible Periodic Maintenance (FPM). In both cases, a non-linear optimization problem with constraints is solved to minimize some performance criteria. Lastly, simulation results on some complex HVLV job-shop systems are presented to illustrate the feasibility of the proposed methodology..