Selected Instruments for Management of Technology Development

Polska dysponuje pewnymi możliwościami rozwijania nowoczesnych technologii, także tych, które aktualnie znajdują się w pierwszych fazach cyklu życia (np. nanotechnologii, spintroniki, fizykochemii zjawisk powierzchniowych, robotyki itd.), i mają wysoki potencjał generowania zysku przy relatywnie niskich (bo niezwiązanych z samymi kosztami produkcji) nakładach inwestycyjnych i niższych wymaganiach, jeśli chodzi o wcześniej zdobyte doświadczenie. Wykorzystanie tych możliwości wymaga rozszerzenia o nowe podejścia tradycyjnego instrumentarium zarządzania technologią, opartego głównie na dorobku teorii racjonalnych oczekiwań. Wśród tych nowych podejść na szczególną uwagę zasługuje foresight i towarzyszące mu: cykl życia technologii i mapowanie, które są przedmiotem niniejszego artykułu

Graphical Analysis of Social Group Dynamics

Identifying communities in social networks becomes an increasingly important research problem. Several methods for identifying such groups have been developed, however, qualitative analysis (taking into account the scale of the problem) still poses serious problems. This paper describes a tool for facilitating such an analysis, allowing to visualize the dynamics and supporting localization of different events (such as creation or merging of groups). In the final part of the paper, the experimental results performed using the benchmark data (Enron emails) provide an insight into usefulness of the proposed tool.Comment: Fourth International Conference on Computational Aspects of Social Networks, CASoN 2012, Sao Carlos, Brazil, November 21-23, 2012, pp. 41-46; IEEE Computer Society, 201

Continuity and canceling operators of order nn on Rn\mathbb{R}^n

We prove that for elliptic and canceling linear differential operators $\mathbb{B}$ of order $n$ on $\mathbb{R}^n$, continuity of a map $u$ can be inferred from the fact that $\mathbb{B} u$ is a measure. We also prove strict continuity of the embedding of the space $\mathrm{BV}^{\mathbb{B}}(\mathbb{R}^n)$ of functions of bounded $\mathbb{B}$-variation into the space of continuous functions vanishing at infinity.Comment: 16 page

Identification of Group Changes in Blogosphere

The paper addresses a problem of change identification in social group evolution. A new SGCI method for discovering of stable groups was proposed and compared with existing GED method. The experimental studies on a Polish blogosphere service revealed that both methods are able to identify similar evolution events even though both use different concepts. Some differences were demonstrated as wellComment: The 2012 IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining, IEEE Computer Society, 2012, pp. 1233-123

Predicting Community Evolution in Social Networks

Nowadays, sustained development of different social media can be observed worldwide. One of the relevant research domains intensively explored recently is analysis of social communities existing in social media as well as prediction of their future evolution taking into account collected historical evolution chains. These evolution chains proposed in the paper contain group states in the previous time frames and its historical transitions that were identified using one out of two methods: Stable Group Changes Identification (SGCI) and Group Evolution Discovery (GED). Based on the observed evolution chains of various length, structural network features are extracted, validated and selected as well as used to learn classification models. The experimental studies were performed on three real datasets with different profile: DBLP, Facebook and Polish blogosphere. The process of group prediction was analysed with respect to different classifiers as well as various descriptive feature sets extracted from evolution chains of different length. The results revealed that, in general, the longer evolution chains the better predictive abilities of the classification models. However, chains of length 3 to 7 enabled the GED-based method to almost reach its maximum possible prediction quality. For SGCI, this value was at the level of 3 to 5 last periods.Comment: Entropy 2015, 17, 1-x manuscripts; doi:10.3390/e170x000x 46 page

Application of headspace solid-phase microextraction followed by gas chromatography–mass spectrometry to determine short-chain alkane monocarboxylic acids in aqueous samples

In this study, a procedure was developed to determine short-chain alkane monocarboxylic acids (SCMAs) in aqueous samples using headspace solid-phase microextraction (HS-SPME) followed by gas chromatography (GC) coupled with mass spectrometry (MS). A Stabilwax-DA capillary column (30 m × 0.32-mm inner diameter, 0.50-μm film thickness) was used for GC separation and a 60-μm poly(ethylene glycol) fiber was used to isolate SCMAs from water and introduce them into the gas chromatograph. Parameters of HS-SPME, analyte desorption, and GC-MS analysis were selected and an analytical procedure was proposed. Limits of quantitation were on the order of about 0.2 mg L-1. As an example of the application of the procedure, SCAMs were determined in municipal wastewater at different steps of treatment

Building sentiment lexicons based on recommending services for the Polish language

Sentiment analysis has become a prominent area of research in computer science. It has numerous practical applications; e.g., evaluating customer satisfaction, identifying product promoters. Many methods employed in this task require language resources such as sentiment lexicons, which are unavailable for the Polish language. Such lexicons contain words annotated with their emotional polarization, but the manual creation of sentiment lexicons is very tedious. Therefore, this paper addresses this issue and describes a new method of building sentiment lexicons automatically based on recommending services. Next, the built lexicons were used in the task of sentiment classification

The impact of salvage logging on herb layer species composition and plant community recovery in Białowieża Forest

Białowieża Forest is one of the closest to pristine forest ecosystems in temperate vegetation zone in European Lowland, which is still being transformed by forest management. We investigated the effects of salvage logging of spruce stands killed by bark beetle on the recovery process and the biodiversity of the herb layer in the early stages of vegetation development after felling, on the habitat of mixed deciduous, oak-lime-hornbeam forest (Tilio-Carpinetum). We tested: (i) to what extent salvage logging modifies the plant species richness and diversity compared to sites left intact; (ii) whether clear-felling leads to an increase in diversity of vascular plants; and (iii) which ecological groups of plants benefit, and which are hindered by disturbance, depending on age and size of the clear-felled site. Salvage harvesting executed between 2012 and 2016 led to an increase in overall plant diversity. However, the winners were the species of open habitats, promoted by soil disturbance, whereas the number and cover of ancient forest indicator species decreased in comparison to unlogged forests. Both trends were significantly related to the increasing size of clear-felled sites, and developed right after logging. A comparison of the species composition of the disturbed (logged and unlogged) sites with undisturbed forest with stands unaffected by infestation, treated as control plots revealed the great potential of the affected sites for spontaneous recovery towards the oak-lime-hornbeam forest community, despite 50–90 years of spruce-dominated stand cover. We conclude that continuous deterioration of the forest habitats via clearcutting of stands affected by insect outbreak, followed by tree planting, substantially reduces the chances of successful, natural regeneration towards deciduous, structurally complex and diverse forests

In situ analysis of usefulness of strontium-fluoride toothpaste for enamel remineralization

Aim. The aim of the study was to investigate the usefulness of an experimental fluoride toothpaste supplemented with Sr2+ for enamel remineralization. Material and methods. Two experimental groups comprised volunteers aged 20–30 years who had all the oral cavity sanation procedures carried out and all the primary and secondary caries lesions filled before undergoing investigations. The material included twenty healthy premolar teeth extracted for orthodontic reasons due to their abnormal position in the arch or to teeth crowding in 12–14 year old children. The teeth were sectioned into blocks and artificially demineralized. The samples were placed in the oral cavity on the buccal surfaces of the first molar teeth of volunteers who used toothpaste supplemented with Ca2+, P043-, F- (group I), toothpaste supplemented with Ca2+, P043-, F-, Sr2+ (group II) and control toothpaste supplemented with Ca2+, P043- (Hydroxyapatite-HAP). The content of calcium and phosphorus was analyzed on the lateral walls of the enamel lesions, at preselected depths of 15 Î1m and 100 Î1m, by using EDS microanalysis. Results. After three months, the content of calcium in both studied groups was significantly lower at 15 Î1m and 100 Î1m of enamel depth than at the baseline (immediately after enamel demineralization). After six months, the content of calcium was lower only at 15 Î1m in both groups. At 100 Î1m of depth the calcium content was significantly higher in group II and the reference group (HAP). After three months the phosphorus content was significantly lower in group II at 15 Î1m. After six months the content of phosphorous was significantly higher in group II at 15 Î1m and 100 Î1m of enamel depth. Conclusion. The results suggest that supplementation of fluoride toothpaste with strontium improved the effect of enamel remineralization

Surface Layer Properties after Successive EDM or EDA and Then Superficial Roto-Peen Machining

The paper presents the results of the influence of basic electrical discharge machining EDM parameters and electrical discharge alloying EDA parameters on surface layer properties and on selected performance properties of machine parts after such machining but also the influence of superficial cold-work treatment applied after the EDM of EDA on modification of these properties. The investigations included texture of the surface, metallographic microstructure, microhardness distribution, fatigue strength, and resistance to abrasive wear. It was proved that the application of the roto-peen after the EDM and the EDA resulted in lowering roughness height up to 70%, the elevation of surface layer microhardness by 300–700 μHV, and wear resistance uplifting by 300%