Design patterns have been successfully applied in the Search Based Software Engineering (SBSE) field to improve software architectures regarding some design principles, such as cohesion, coupling and reusability. Howe...
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Design patterns have been successfully applied in the Search Based Software Engineering (SBSE) field to improve software architectures regarding some design principles, such as cohesion, coupling and reusability. However, we did not find, in the SBSE literature, approaches exploring the application of design patterns in software Product Line Architectures (PLAs). In this sense, this paper presents results from a feasibility analysis, conducted with GoF (Gang of Four) patterns, to verify their applicability in the context of a search-based approach for PLA design. The analysis considered the pattern structure, consequences of use according to some architectural metrics, flexibility and automation aspects. As a result, this paper also introduces a metamodel representation for scopes that are suitable to receive the design patterns application.
A circularly polarized (CP) dual frequency cross shaped slotted microstrip patch antenna is designed for microsatellite applications in this paper. Asymmetric cross-shaped slot are embedded in the middle of the square...
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A circularly polarized (CP) dual frequency cross shaped slotted microstrip patch antenna is designed for microsatellite applications in this paper. Asymmetric cross-shaped slot are embedded in the middle of the square patch for CP radiation and four hexagonal slots are etched on the four sides of the square patch for desired dual frequency. The proposed antenna is excited by a single probe fed in the second quadrant of the patch. The simulated results show that the impedance bandwidth is approximately 40 MHz (2.17 GHz to 2.21 GHz) for lower band and 70 MHz (3.25 GHz to 3.32 GHz) for higher band and average peak gain 6.13 dBiC and 5.45 dBiC, respectively. In addition, the antenna shows good radiation pattern performance with relatively stable gains over the operating band, which is very attractive for satellite applications. The overall dimension of the antenna is 0.305λ × 0.305λ × 0.012 λ.
Software Product Line Engineering has significant advantages in family-based software development. The common and variable structure for all products of a family is defined through a Product-Line Architecture (PLA) th...
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Software Product Line Engineering has significant advantages in family-based software development. The common and variable structure for all products of a family is defined through a Product-Line Architecture (PLA) that consists of a common set of reusable components and connectors which can be configured to build the different products. The design of PLA requires solutions for capturing such configuration (variability). The Flexible-PLA Model is a solution that supports the specification of external variability of the PLA configuration, as well as internal variability of components. However, a complete support for product-line development requires translating architecture specifications into code. This complex task needs automation to avoid human error. Since Model-Driven Development allows automatic code generation from models, this paper presents a solution to automatically generate AspectJ code from Flexible-PLA models - previously configured to derive specific products. This solution is supported by a modeling framework and validated in a software factory.
Oil prices and availability and the investment cycle heavily influence innovation in petrochemical industries. New feedstock is thus strategic to these industries [9]. The concerns on environmentally-friendly processe...
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Oil prices and availability and the investment cycle heavily influence innovation in petrochemical industries. New feedstock is thus strategic to these industries [9]. The concerns on environmentally-friendly processes, on another hand, further increase the interest on renewable feedstock in the countries with attractive production costs. R&D on these renewable inputs reveals great opportunities in the bio-based plastics market. The objective here is to present the current bio-based plastics development situation and to identify the main factors which affect innovation on these technologies as well as their adoption and diffusion. The analyses are structured through the integrative framework proposed by Suarez [3]. An important dependency on the feedstock availability has been identified as critical, and Brazil seems to have competitive advantages, due to its strong knowledge on sugar cane production and ethanol processing. The Brazilian industry has already launched commercial products, but, none has already emerged as a clear front runner in the world market. Following the framework proposed by Suarez, the possible reasons for this barrier are discussed.
Capstone courses play a key role in many Computer Science/Software Engineering curricula. They offer a summative opportunity for SE students to apply their skills and knowledge in a single experience and prepare them ...
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Capstone courses play a key role in many Computer Science/Software Engineering curricula. They offer a summative opportunity for SE students to apply their skills and knowledge in a single experience and prepare them for work in industry. Capstones have many attributes that make them a valuable high-impact practice, yet there are several challenges that can be associated with them. These challenges include the general nature of a capstone that prevents deeper applications of skills, not to mention the difficulty of creating an interesting and engaging design project upon which students can make meaningful contributions and engage in extensive team dynamics. This experience report outlines an innovative approach to a senior design capstone course that addresses common limitations of capstone courses. The SimSYS capstone course is unique in that it involved a mixed team organization involving a more senior design team who led a development team over the course of the semester, thereby leveraging the diverse experience of capstone students completing their CS/SE degree. The results point to solutions for continuing a capstone project successfully in subsequent semesters that could be of interest to other SE curriculum designers looking to develop effective capstone courses.
Grey system theory deals with systems characterized by the uncertainty of the partially known/unknown information. The traditional Grey prediction model GM(1,1) has been widely used in different short-term prediction ...
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Grey system theory deals with systems characterized by the uncertainty of the partially known/unknown information. The traditional Grey prediction model GM(1,1) has been widely used in different short-term prediction applications including wind power forecast. However, it is proved that it cannot provide sufficient prediction accuracy. In this paper a new approach for short-term wind power prediction is proposed. The suggested technique is a hybrid method comprised of the GM(1,1) forecasting model and the Nonlinear Auto Regressive neural network (NARnet) method. The forecasting precision of the proposed method is examined by applying it to an actual wind power data set. The experimental results confirm that the proposed technique outperforms the traditional GM(1,1), GM(1,1)-ARMA, and the persistence method.
Hierarchical micron- and submicron-sized repetitive pattern was found in TiO 2 nanocrystal aggregates prepared by pulsed laser ablation. The pattern structure can be varied by background gas pressure. The results sho...
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ISBN:
(纸本)9781467364751
Hierarchical micron- and submicron-sized repetitive pattern was found in TiO 2 nanocrystal aggregates prepared by pulsed laser ablation. The pattern structure can be varied by background gas pressure. The results show existence of stable aggregated structure.
A wavelength selective uncooled infrared (IR) sensor was developed using triangular-lattice plasmonic absorbers (PLA). The triangular-lattice PLA has a Au-based two-dimensional periodic dimple-array with a triangular ...
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A wavelength selective uncooled infrared (IR) sensor was developed using triangular-lattice plasmonic absorbers (PLA). The triangular-lattice PLA has a Au-based two-dimensional periodic dimple-array with a triangular lattice, where photons can be manipulated using the spoof surface plasmon. A microelectromechanical system (MEMS)-based uncooled IR sensor with triangular-lattice PLA was fabricated using complementary metal oxide semiconductor (CMOS) and micromachining techniques. Measurement of the spectral responsivity demonstrated that selective enhancement of the responsivity can be achieved and that the detection wavelength of the triangular-lattice PLA was shorter than that of the square-lattice PLA due to the differences in lattice structure.
The character thinning can greatly eliminate redundant information and improve the speed and accuracy of the character feature extraction. The paper proposes an algorithm for extracting characters' central skeleto...
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The character thinning can greatly eliminate redundant information and improve the speed and accuracy of the character feature extraction. The paper proposes an algorithm for extracting characters' central skeleton directly, which is based on the length of eight-direction and the line connected by inscribed circle center of the character segment, while the information of strokes is obtained. The experimental reports show that the proposed algorithm has good robustness and it can make the character thin stably and effectively.
We present a photoconductive terahertz emitter that incorporates nanoscale plasmonic contact electrodes to offer significantly higher radiation powers compared to conventional photoconductive terahertz emitters. Radia...
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We present a photoconductive terahertz emitter that incorporates nanoscale plasmonic contact electrodes to offer significantly higher radiation powers compared to conventional photoconductive terahertz emitters. Radiation enhancement is the result of reducing the average transport path of photo-generated carriers to the plasmonic contact electrodes and, thus, increasing the number of the photocarriers that can be routed to the terahertz antenna in a sub-picosecond time-scale to efficiently contribute to terahertz radiation. We experimentally demonstrate up to 50 times higher terahertz radiation powers from the presented plasmonic photoconductive terahertz emitter compared to a similar conventional photoconductive terahertz emitter without plasmonic contact electrodes.
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