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Abstract

Computational modeling plays an important role in the methodology of contemporary science. The epistemological role of modeling and simulations leads to questions about a possible use of this method in philosophy. Attempts to use some mathematical tools to formulate philosophical concepts trace back to Spinoza and Newton. Newtonian natural philosophy became an example of successful use of mathematical thinking to describe the fundamental level of nature. Newton’s approach has initiated a new scientific field of research in physics and at the same time his system has become a source of new philosophical considerations about physical reality. According to Michael Heller, some physical theories may be treated as the formalizations of philosophical conceptions. Computational modeling may be an extension of this idea; this is what I would like to present in the article. I also consider computational modeling in philosophy as a source of new philosophical metaphors; this idea has been proposed in David J. Bolter’s conception of defining technology. The consideration leads to the following conclusion: In the methodology of philosophy significant changes have been taking place; the new approach do not make traditional methods obsolete, it is rather a new analytical tools for philosophy and a source of inspiring metaphors.

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Authors and Affiliations

Paweł Polak
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Abstract

There are many industrial environments which are exposed to a high-level noise, sometimes much higher than the level of speech. Verbal communication is then practically unfeasible. In order to increase the speech intelligibility, appropriate speech enhancement algorithms can be used. It is impossible to filter off the noise completely from the acquired signal by using a conventional filter, because of two reasons. First, the speech and the noise frequency contents are overlapping. Second, the noise properties are subject to change. The adaptive realisation of the Wiener-based approach can be, however, applied. Two structures are possible. One is the line enhancer, where the predictive realisation of the Wiener approach is used. The benefit of using this structure it that it does not require additional apparatus. The second structure takes advantage of the high level of noise. Under such condition, placing another microphone, even close to the primary one, can provide a reference signal well correlated with the noise disturbing the speech and lacking the information about the speech. Then, the classical Wiener filter can be used, to produce an estimate of the noise based on the reference signal. That noise estimate can be then subtracted from the disturbed speech. Both algorithms are verified, based on the data obtained from the real industrial environment. For laboratory experiments the G. R. A. S. artificial head and two microphones, one at back side of an earplug and another at the mouth are used.

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Authors and Affiliations

Mariusz Latos
Marek Pawełczyk
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Abstract

This study presents the indoor soundscape framework in detail by describing the variables and factors that form an indoor soundscape study. The main objective is to introduce a new indoor soundscaping framework and systematically explain the variables that contribute to the overall evaluation of an indoor soundscape. Hence, the dependencies of physical and psychoacoustical factors of the sound environment and the spatial factors of the built entity are statistically tested. The new indoor soundscaping framework leads to an overarching evaluation perspective of enclosed sound environments, combining objective room acoustics research and noise control engineering with architectural analysis. Therefore, it is hypothesised that case spaces with certain plan organisations, volumetric relations, and spatial referencing lead to differentiated sound pressure level (SPL) and loudness (N) values. SPL and N parametric variances of the sound environments are discussed through the statistical findings with respect to the architectural characteristics of each library case space. The results show that the relation between crowd level variances and sound environment parametric values is statistically significant. It is also found that increasing the atrium height and atrium void volume, the atrium’s presence as a common architectural element, and its interpenetrating reference and domain containment results in unwanted variances and acoustic formations, leading to high SPL and N values.
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Authors and Affiliations

Papatya Nur Dokmeci Yorukoglu
Jian Kang
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Abstract

The main topic of this paper deals with a general description of the notion of the class of objects, its historical draft and development in linguistic studies (generative grammar of N. Chomsky, semantic markers in the theory of J.J. Katz, J.A. Fodor, the predicate-argument structure of S. Karolak and the electronic dictionary of G. Gross). The author takes advantage of this concept in her analysis basing on object-oriented approach and the disambiguation by W. Banyś. This article demonstrates also that the disambiguation of the meaning of polysemic word pass by a correct choise of a class of objects which is the only solution to provide adequate equivalents in the target language and the condition of the effective and satisfying translation supported by computer.

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Authors and Affiliations

Aleksandra Żłobińska-Nowak
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Abstract

Today the use of plant extracts, in particular essential oils, is a natural alternative to synthetic insecticides in the fight against crop pests. In this study, the insecticidal activity of essential oils and powder of Xylopia aethiopica (Annonaceae) were tested by both fumigation and contact against Callosobruchus maculatus. The essential oil of X. aethiopica, obtained by steam distillation and the powder, with a particle size of 1 mm, were used for the tests. The analysis of essential oils and powder of X. aethiopica by GC-MS/FID and GC/MS-HS-SPME, showed that the main compounds were β-pinene (28.9–19.0%), 1,8-cineole (14.9–7.6%) and α-pinene (9.8–19.4%). Insecticidal activity of essential oils and powder of X. aethiopica, respectively, by fumigation (F) and contact (C) against C. maculatus showed toxicity LD50 = 0.2 ± 0.0 μl.cm–3, LT50 = 16.4 ± 1.2 hours (F) and LD50 = 9.2 ± 0.7 g.kg–1, LT50 = 69.6 ± 0.4 hours (C). The essential oil and powder of X. aethiopica can be considered as bio-insecticides against C. maculatus for the protection of cowpeas in Senegal.
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Authors and Affiliations

Abdoulaye Thiam
1 2
ORCID: ORCID
Momar Talla Guèye
2
Cheikhna Hamala Sangharé
1 2
Papa Seyni Cissokho
2
Elhadji Barka Ndiaye
1
Serigne Mbacké Diop
1
Michel Barka Diop
3
Ibrahima Ndiaye
1
Marie Laure Fauconnier
4

  1. Department of Chemistry, Faculty of Sciences and Techniques, Cheikh Anta Diop University, Dakar, Senegal
  2. Laboratory of Phytosanitary Analyses, Institute of Food Technology, Dakar, Senegal
  3. Unit of Training and Research of Agronomic Sciences, Aquaculture and Food Technology (S2ATA), Gaston Berger University, Saint-Louis, Senegal
  4. General and Organic Chemistry Laboratory, Gembloux Agro-Bio-Tech University of Liege, Gembloux, Belgium
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Abstract

The presented work proposes a new dimming control schemes for indoor visible light communication which combines variable pulse-position modulation, colour shift keying as key schemes of IEEE 802.15.7 standard, and sub carrier-pulse-position modulation as a pulse-position modulation variant with orthogonal frequency division multiplexing. These schemes are then compared with traditional merging schemes utilizing pulse-width modulation and multiple pulse-position modulation with m-ary quadrature amplitude modulation OFDM. The proposed schemes are investigated in a typical room with a different lighting layout (i.e., distinctive and uniform lighting layout), followed by an illumination investigation to evaluate the performance of the proposed schemes, especially the enhanced achieved data rates, and to determine their limitations as reliable visible light communication systems that can satisfy both communication and illumination requirements.

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Authors and Affiliations

Nazmi A. Mohammed
Kareem A. Badawi
Ashraf A. M. Khalaf
S. El-Rabaie

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