1,721,229 research outputs found
Hybrid single node genetic programming for symbolic regression
No full textThis paper presents a first step of our research on designing an effective and efficient GP-based method for symbolic regression. First, we propose three extensions of the standard Single Node GP, namely (1) a selection strategy for choosing nodes to be mutated based on depth and performance of the nodes, (2) operators for placing a compact version of the best-performing graph to the beginning and to the end of the population, respectively, and (3) a local search strategy with multiple mutations applied in each iteration. All the proposed modifications have been experimentally evaluated on five symbolic regression benchmarks and compared with standard GP and SNGP. The achieved results are promising showing the potential of the proposed modifications to improve the performance of the SNGP algorithm. We then propose two variants of hybrid SNGP utilizing a linear regression technique, LASSO, to improve its performance. The proposed algorithms have been compared to the state-of-the-art symbolic regression methods that also make use of the linear regression techniques on four real-world benchmarks. The results show the hybrid SNGP algorithms are at least competitive with or better than the compared methods.Accepted Author Manuscript. Revised version of a selected paper from IJCCI 2015.OLD Intelligent Control & Robotic
Technological Development-Droplet as a Tool
No full textThe high uptake of droplet microfluidics in multidisciplinary research is mainly due to its capability of being a micro-scale laboratory with high versatility in controlling each microreactor. Through the implementation of three main manipulation methods, multiple reactions can be produced and subsequently used for different applications. Droplets of a predetermined medium are first generated. Subsequently, the coalescence of different droplets can also take place to mix different reagents. Finally, sorting of droplets according to pre-set variables is carried out, facilitating the analysis of results. Each manipulation method, however, can be carried out using a variety of active control methods. These can be categorized into electrical, magnetic, thermal, pneumatic, and occasionally acoustic and optical means. Further elaboration is provided in this chapter to illustrate these methods with the repertoire of mechanisms developed for these purposes. The advancement of such techniques enables high selectivity with minimal waste of resources, reducing the carbon footprint of laboratories while concurrently pursuing science.Full Tex
Re-Entrant Microstructures for Robust Liquid Repellent Surfaces
No full textSuperhydrophobic surfaces have many interesting applications because of their self-cleaning, waterproof, anti-biofouling, anti-corrosion, and low-adhesion properties. Accordingly, numerous surfaces with hierarchical micro/nanostructures are designed and engineered to achieve superhydrophobicity. However, these surfaces have two major problems. First, they lose superhydrophobic properties over time, primarily because of environmental conditions such as vibration, external pressure, evaporation, and pollution. Second, most superhydrophobic surfaces fail to repel all types of liquids, especially those with low surface tensions. To address this bottleneck, microstructures with re-entrant curvature have emerged, demonstrating excellent liquid-repellent abilities and robustness. Additionally, microstructures with re-entrant curvature have significant applications in designing surfaces with unidirectional wetting properties for passive liquid handling. Accordingly, this review systematically summarizes the design and fabrication strategies of these re-entrant microstructures. The emphasis is given to wettability studies and other surface properties of re-entrant microstructures and their applications, especially for liquid self-transporting. This paper also highlights the potential applications and remaining technical challenges of fabricating these structures. Finally, the study is concluded by providing the future directions in this promising field.Full Tex
Lab-on-a-Chip Technologies for Microgravity Simulation and Space Applications
No full textGravity plays an important role in the development of life on earth. The effect of gravity on living organisms can be investigated by controlling the magnitude of gravity. Most reduced gravity experiments are conducted on the Lower Earth Orbit (LEO) in the International Space Station (ISS). However, running experiments in ISS face challenges such as high cost, extreme condition, lack of direct accessibility, and long waiting period. Therefore, researchers have developed various ground-based devices and methods to perform reduced gravity experiments. However, the advantage of space conditions for developing new drugs, vaccines, and chemical applications requires more attention and new research. Advancements in conventional methods and the development of new methods are necessary to fulfil these demands. The advantages of Lab-on-a-Chip (LOC) devices make them an attractive option for simulating microgravity. This paper briefly reviews the advancement of LOC technologies for simulating microgravity in an earth-based laboratory.Full Tex
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Magnetic cell separation
No full textMagnetic cell separation, also termed magnetic-activated cell sorting, refers to the separation technology that employs magnetic fields to differentiate various cell populations and isolates target cells from the biological sample. Due to the superior advantages such as low cost, simple operation, high selectivity, high throughput, robustness, and good biocompatibility, magnetic cell separation technology has been developed rapidly, and a variety of magnetic cell separation designs have been proposed. As a very promising candidate for cell separation, magnetic cell separation has been successfully applied for a wide range of biomedical applications. This chapter discusses the fundamental physics behind magnetic cell separation, elaborates the typical formats of developed technologies, and summarizes their key applications of cell separation. This chapter is expected to help readers to have a clear concept of magnetic cell separation, to understand its fundamental physics, and to familiarize typical designs of magnetic cell separators and their applications.No Full Tex
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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