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排序方式: 共有78条查询结果,搜索用时 31 毫秒
1.
A systematic approach for product families formation in Reconfigurable Manufacturing Systems 总被引:2,自引:0,他引:2
The aim of this work is to establish a methodology for an effective working of Reconfigurable Manufacturing Systems (RMSs). These systems are the next step in manufacturing, allowing the production of any quantity of highly customised and complex products together with the benefits of mass production. In RMSs, products are grouped into families, each of which requires a system configuration. The system is configured to produce the first family of products. Once it is finished, the system is reconfigured in order to produce the second family, and so forth. Therefore, the effectiveness of a RMS depends on the formation of the best set of product families. Therefore, a methodology for grouping products into families, which takes into account the requirements of products in RMSs, is an issue of core importance. These requirements are modularity, commonality, compatibility, reusability, and product demand. The methodology starts by calculating, for each product requirement, a matrix that summarises the similarity between pairs of products. Then, through the use of the AHP methodology, a unique matrix that comprises the similarity values between products is obtained. The Average Linkage Clustering algorithm is applied to this matrix in order to obtain a dendogram that shows the diverse sets of product families that may be formed. 相似文献
2.
R C Galan F Jimenez-Garrido R Dominguez-Castro S Espejo T Roska C Rekeczky I Petras A Rodriguez-Vazquez 《Neural Networks, IEEE Transactions on》2003,14(5):1313-1336
A bio-inspired model for an analog programmable array processor (APAP), based on studies on the vertebrate retina, has permitted the realization of complex programmable spatio-temporal dynamics in VLSI. This model mimics the way in which images are processed in the visual pathway, what renders a feasible alternative for the implementation of early vision tasks in standard technologies. A prototype chip has been designed and fabricated in 0.5 /spl mu/m CMOS. It renders a computing power per silicon area and power consumption that is amongst the highest reported for a single chip. The details of the bio-inspired network model, the analog building block design challenges and trade-offs and some functional tests results are presented in this paper. 相似文献
3.
R. Galan J. Racero I. Eguia D. Canca 《The International Journal of Advanced Manufacturing Technology》2007,33(3-4):345-353
The launch of new products to the market is essential for companies in order to remain competitive. Products are constantly
being replaced for others that fulfil the changing requirements of the customers. For achieving this, companies have to adapt
their production system to the new requirements of the new products by adding or removing machines, changing the lay-out,
etc. Normally, this reconfiguration implies a high investment. Reconfigurable manufacturing systems (RMSs) arise for facilitating
the reconfiguration of the production system, being considered as the next step in manufacturing. This paper deals with the
development of a methodology based on RMSs that allows a feasible reconfiguration of production systems. This methodology
is based on the ALCA algorithm from group technology, and takes into account five requirements of products on RMSs: modularity,
commonality, compatibility, reusability and demand. The selection of the product families is obtained with a mathematical
model specifically formulated for this purpose. 相似文献
4.
5.
B. Dershel' K. Prokert G. Shtroibel' F. Shurikht V. E. Aleinikov V. A. Arkhipov V. P. Bamblevskii G. Ya. Kaskanov M. M. Komochkov M. I. Salatskaya A. P. Cherevatenko V. V. Grechko A. Apostol A. Dragu M. Nikolae D. Khashigan P. Galan A. Grabovtsova D. Nikodemova Z. Spurny F. Spurny K. Turek Z. Prousa G. Solnitska I. Kubechkova 《Atomic Energy》1981,50(3):186-190
6.
Amparo Galan Anna Padros Marta Arambarri Silvia Martin 《Journal of Automated Methods and Management in Chemistry》1998,20(1):23-26
A spectrometric method for the determination of L-carnitine has
been developed based on the reaction of the 5,5′ dithiobis-(2-nitrobenzoic) acid (DTNB) and adapted to a Technicon RA-2000 automatic analyser Química Farmacéutica Bayer, S.A.). The detection limit of the method is 13.2 μmol/l, with a measurement interval ranging from 30 to 320 μmoll1. Imprecision and accuracy are good even at levels close to the detection limit (coeffcient of variation of 5.4% for within-run imprecision for a concentration of 35 μmol/l). A good correlation was observed between the method studied and the radiometric method. The method evaluated has suffcient analytical sensitivity to diagnose carnitine deficiencies. The short time period required for sample processing (30 samples in 40min), the simple methodology and apparatus, the ease of personnel training and the low cost of the reagents make this method a good alternative to the classical
radiometric method for evaluating serum L-carnitine in clinical laboratories without radioactive installations. 相似文献
7.
This article presents the first results of our study and experimentation with the new IPv6 IX-based address assignment model and its deployment in IXs where peering is organized around route servers. An IX model that identifies where the new IX customers can be located and how services like provider choice or multihoming can be offered is proposed. The article also describes the emulation environment that has been developed to easily create and experiment with complex IX scenarios without involving setup of costly configurations made of several pieces of equipment. This work has been carried out in the context of the European Union funded project Euro6IX. 相似文献
8.
Discovery of selective, small-molecule inhibitors of RNA complexes--I. The Tat protein/TAR RNA complexes required for HIV-1 transcription 总被引:2,自引:0,他引:2
HY Mei DP Mack AA Galan NS Halim A Heldsinger JA Loo DW Moreland KA Sannes-Lowery L Sharmeen HN Truong AW Czarnik 《Canadian Metallurgical Quarterly》1997,5(6):1173-1184
We have developed a therapeutic program focusing on the inhibition of a human immunodeficiency virus-1 specific protein-RNA interaction. This program begins with a search for small organic molecules that would interfere with the binding of Tat protein to TAR RNA. The methodologies chosen to study the HIV-1 Tat-TAR interaction and inhibition include gel mobility shift assays, scintillation proximity assays, filtration assays, and mass spectrometry. These methods helped establish in vitro high-throughput screening assays which rapidly identified Tat-TAR inhibitors from our corporate compound library. Tat-activated reporter gene assays were then used to investigate the cellular activities of the Tat-TAR inhibitors. The cellular activity, selectivity, and toxicity data for select Tat-TAR inhibitors were determined. Evaluation of both the cellular data and the Tat-TAR inhibition results led to further testing in anti-HIV-1 infection assays. 相似文献
9.
Cembrano G.L. Rodriguez-Vazquez A. Galan R.C. Jimenez-Garrido F. Espejo S. Dominguez-Castro R. 《Solid-State Circuits, IEEE Journal of》2004,39(7):1044-1055
This paper presents a mixed-signal programmable chip for high-speed vision applications. It consists of an array of processing elements, arranged to operate in accordance with the principles of single instruction multiple data (SIMD) computing architectures. This chip, implemented in a 0.35-/spl mu/m fully digital CMOS technology, contains /spl sim/ 3.75 M transistors and exhibits peak performance figures of 330 GOPS (8-bit equivalent giga-operations per second), 3.6 GOPS/mm/sup 2/ and 82.5 GOPS/W. It includes structures for image acquisition and for image processing, meaning that it does not require a separate imager for operation. At the sensory side, integration and log-compression sensing circuits are embedded, thus allowing the chip to handle a large variety of illumination conditions. At the processing plane, analog and digital circuits are employed whose parameters can be programmed and their architecture reconfigured for the realization of software-coded processing algorithms. The chip provides, and accepts, 8-bit digitized data through a 32-bit bidirectional data bus which operates at 120 MB/s. Experimental results show that frame rates of 1000 frames per second (FPS) can be achieved under room illumination conditions; applications using exposures of about 50 /spl mu/s have been recently reached by using special illumination setups. The chip can capture an image, run approximately 150 two-dimensional linear convolutions, and download the result in 8-bit digital format, in less than 1 ms. This feature, together with the possibility of executing sequences of user-definable instructions (stored on a full-custom 32-kb on-chip memory), and storing intermediate results (up to 8 grayscale images) makes the chip a true general-purpose sensory/processing device. 相似文献
10.
Ramirez-Angulo J. Carvajal R.G. Galan J.A. Lopez-Martin A. 《Circuits and Systems II: Express Briefs, IEEE Transactions on》2006,53(7):568-571
A simple and efficient low-voltage two-stage operational amplifier with Class-AB output stage is introduced. It has a large effective output current boosting factor (/spl sim/50) and close to a factor 2 bandwidth enhancement. This is achieved at the expense of minimum increase in circuit complexity and no additional static power dissipation. Experimental verification of the characteristics of the proposed circuit is provided. 相似文献