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12.
《Applied ergonomics》1987,18(3):252-253
13.
《Computers & Graphics》1987,11(2):113-120
In this paper we present the design and implementation of a geometric modeling system for modeling solids bounded by sculptured surfaces. The three most important solid representation schemes—constructive solid geometry, boundary representation, and octree representation—are combined together in our system in such a way that the resulting scheme enjoys many of the advantages of its individual schemes. We also developed algorithms for conversion of objects from their boundary representation to octree representation, and for the boundary evaluation of octree encoded objects. The system was implemented on a DEC 1090 computer in PASCAL, and we have presented a simple illustrative example to show the use of the system to create solid objects bounded by sculptured surfaces. 相似文献
14.
Mauro F. La Russa Silvestro A. Ruffolo Natalia Rovella Cristina M. Belfiore Anna M. Palermo Maria T. Guzzi Gino M. Crisci 《Progress in Organic Coatings》2012
Environmental pollution arising from industrial implants and urban factors is constantly increasing, causing aesthetical and durability concerns to urban structures exposed to the atmosphere. 相似文献
15.
Gianluigi Folino Agostino Forestiero Giandomenico Spezzano 《Information Sciences》2009,179(18):3059-99
This paper presents an approach based on an adaptive bio-inspired method to make state of the art clustering algorithms scalable and to provide them with an any-time behavior. The method is based on the biology-inspired paradigm of a flock of birds, i.e. a population of simple agents interacting locally with each other and with the environment. The flocking algorithm provides a model of decentralized adaptive organization useful to solve complex optimization, classification and distributed control problems. This approach avoids the sequential search of canonical clustering algorithms and permits a scalable implementation.The method is applied to design two novel clustering algorithms based on the main principles of two popular clustering algorithms: DBSCAN and SNN. This apporach can identify clusters of widely varying shapes and densities and is able to extract an approximate view of the clusters whenever it is required. Both the algorithms have been evaluated on synthetic and real world data sets and the impact of the flocking strategy on performance has been evaluated. 相似文献
16.
Instead of injecting harmonic currents to compensate those drawn by distorting loads, in this paper a shunt active filter is used for generating harmonic voltages to compensate harmonic voltages at the point of common coupling; the main advantage in using such a compensation approach is that, when the aim is to reduce or eliminate the harmonic voltages at the point of common coupling only one active filter is required. For determining the harmonic voltages such a filter must generate, two simple and practical methods are proposed in this paper; the effectiveness of these methods was evaluated using a 1-kW prototype of an active filter operating according to the shunt harmonic voltage compensation approach. In addition, the laboratory results were comparable to those obtained with the ATP-EMTP simulation software. 相似文献
17.
Luigi Palopoli Domenico Rosaci Giorgio Terracina Domenico Ursino 《Knowledge and Information Systems》2005,8(4):462-497
The problem of handling both the integration and the cooperation of a large number of information sources characterised by
heterogeneous representation formats is a challenging issue. In this context, a central role can be played by the knowledge
about the semantic relationships holding between concepts belonging to different information sources (intersource properties).
In this paper, we propose a semiautomatic approach for extracting two kinds of intersource properties, namely synonymies and
homonymies, from heterogeneous information sources. In order to carry out the extraction task, we introduce both a conceptual
model, for representing involved sources, and a metrics, for measuring the strength of the semantic relationships holding
among concepts represented within the same source. 相似文献
18.
In this paper, novel integer programming formulations are developed for solving the optimal scheduling of patients waiting
for radiotherapy treatment. In this specific clinical domain, the suitable management and control of a patients’ waiting list
strongly affect both the quality of the therapeutical outcome, in terms of effectiveness, and the cost-saving use of the overall
therapeutical resources, in terms of efficiency. The proposed models allow the best scheduling strategy to be devised by taking
into account the quality of the health care service offered to the patient as well as the status and the preferences of the
patient. The computational experiments, carried out on realistic scenarios and considering real data, are very promising and
show the efficiency and robustness of the proposed models to address the problem under consideration. 相似文献
19.
A robust deconvolution scheme for fault detection and isolation of uncertain linear systems: an LMI approach 总被引:1,自引:0,他引:1
Alessandro Casavola Author Vitae 《Automatica》2005,41(8):1463-1472
Optimal H∞ deconvolution filter theory is exploited for the design of robust fault detection and isolation (FDI) units for uncertain polytopic linear systems. Such a filter is synthesized under frequency domain conditions which ensure guaranteed levels of disturbance attenuation, residual decoupling and deconvolution performance in prescribed frequency ranges. By means of the Projection Lemma, a quasi-convex formulation of the problem is obtained via LMIs. A FDI logic based on adaptive thresholds is also proposed for reducing the generation of false alarms. The effectiveness of the design technique is illustrated via a numerical example. 相似文献
20.
Seawater desalination through the air gap membrane distillation (AGMD) process shows merit for its ambient operational conditions
and low energy consumption. In this paper nine types of commercially available membranes were characterized to understand
the membranes more comprehensively. The density, porosity, mean pore radius, liquid entry pressure (LEP), and contact angle
(CA) of the membranes were determined. AGMD experiments were performed for the membranes to investigate the membrane difference
on permeation flux and salt rejection. The effects of operating parameters such as temperature, flow rate, and NaCl concentration
were studied. The 0.22 μm pore size PTFE membrane showed excellent performance for its higher permeability and higher hydrophobicity
than other membranes. The mass transfer coefficients for three types of PTFE membranes were calculated from the results of
the experiments. 相似文献