1,721,315 research outputs found
Automatic Recognition of General LPI Radar Waveform using SSD and Supplementary Classifier
No full textFor low probability of intercept (LPI) radars, frequency-modulated and phase-modulated continuous waveforms are widely used because of their low peak power compared to that of pulse waves (PW). However, there has been a limited number of studies on recognizing continuous wave (CW) LPI radar, in spite of its importance and popularity. In this paper, in order to recognize both PW and CW LPI radar waveforms, we propose an LPI radar waveform recognition technique (LWRT) based on a single-shot multi-box detector (SSD) and a supplementary classifier. It is demonstrated with Monte Carlo simulations that the proposed LWRT achieves classification performance similar to that of the current LWRT with the highest classification performance for PW LPI radar waveforms, even without the prior condition used in existing LWRTs. For CW LPI radar waveforms, on the other hand, with the combination of the SSD and the supplementary classifier, the proposed LWRT achieves extraordinary recognition performance for all 12 LPI radar modulation schemes (i. e., BPSK, Costas, LFM, Frank, P1, P2, P3, P4, T1, T2, T3, and T4) considered in the literature.
Biorenewable, Transparent, and Oxygen/Moisture Barrier Nanocellulose/Nanochitin-Based Coating on Polypropylene for Food Packaging Applications
No full textAluminum-coated polypropylene films are commonly used in food packaging because aluminum is a great gas barrier. However, recycling these films is not economically feasible. In addition, their end-of-life incineration generates harmful alumina-based particulate matter. In this study, coating layers with excellent gas-barrier properties are assembled on polypropylene films through layer-by-layer (LbL) deposition of biorenewable nanocellulose and nanochitin. The coating layers significantly reduce the transmission of oxygen and water vapors, two unfavorable gases for food packaging, through polypropylene films. The oxygen transmission rate of a 60 μm-thick, 20 LbL-coated polypropylene film decreases by approximately a hundredfold, from 1118 to 13.10 cc m−2 day−1 owing to the high crystallinity of nanocellulose and nanochitin. Its water vapor transmission rate slightly reduces from 2.43 to 2.13 g m−2 day−1. Furthermore, the coated film is highly transparent, unfavorable to bacterial adhesion and thermally recyclable, thus promising for advanced food packaging applications.11Ysciescopu
The Renewable and Sustainable Conversion of Chitin into a Chiral Nitrogen-Doped Carbon-Sheath Nanofiber for Enantioselective Adsorption
No full textWell-known hard-template methods for nitrogen (N)-doped chiral carbon nanomaterials require complicated construction and removal of the template, high-temperature pyrolysis, harsh chemical treatments, and additional N-doping processes. If naturally occurring chiral nematic chitin nanostructures [(C8H13NO5)(n)] in exoskeletons were wholly transformed into an N-doped carbon, this would be an efficient and sustainable method to obtain a useful chiral nanomaterial. Here, a simple, sacrificial-template-free, and environmentally mild method was developed to produce an N-doped chiral nematic carbon-sheath nanofibril hydrogel with a surface area >300 m(2) g(-1) and enantioselective properties from renewable chitin biomass. Calcium-saturated methanol physically exfoliated bulk chitin and produced a chiral nematic nanofibril hydrogel. Hydrothermal treatment of the chiral chitin hydrogel at 190 degrees C produced an N-doped chiral carbon-sheath nanofibril hydrogel without N-doping. This material preferentially adsorbed d-lactic acid over l-lactic acid and produced 16.3 % enantiomeric excess of l-lactic acid from a racemic mixture.11Nsciescopu
Sustainable Boron Nitride Nanosheet-Reinforced Cellulose Nanofiber Composite Film with Oxygen Barrier without the Cost of Color and Cytotoxicity
No full textThis paper introduces a boron nitride nanosheet (BNNS)-reinforced cellulose nanofiber (CNF) film as a sustainable oxygen barrier film that can potentially be applied in food packaging. Most commodity plastics are oxygen-permeable. CNF exhibits an ideal oxygen transmission rate (OTR) of <1 cc/m(2)/day in highly controlled conditions. A CNF film typically fabricated by the air drying of a CNF aqueous solution reveals an OTR of 19.08 cc/m(2)/day. The addition of 0-5 wt % BNNS to the CNF dispersion before drying results in a composite film with highly improved OTR of 4.7 cc/m(2)/day, which is sufficient for meat and cheese packaging. BNNS as a 2D nanomaterial increases the pathway of oxygen gas and reduces the chances of pinhole formation during film fabrication involving water drying. In addition, BNNS improves the mechanical properties of the CNF films (Young's modulus and tensile strength) without significant elongation reductions, probably due to the good miscibility of CNF and BNNS in the aqueous solution. Addition of BNNS also produces negligible color change, which is important for film aesthetics. An in vitro cell experiment was performed to reveal the low cytotoxicity of the CNF/BNNS composite. This composite film has great potential as a sustainable high-performance food-packaging material.11Nsciescopu
Can the use of an Enterprise Social Network improve communication within an organization compared to intranet and email?
Full text linkThe objective of this research was to evaluate the effectiveness of using Enterprise Social Network (ESN) for internal communication. The key was to identify the organizational goal which is employee engagement; then to assess if using ESN can help the company reach the goal. Meanwhile, the author investigated if the ESN is a possible alternative to email and intranet by comparing their function and popularity.
The author applied the quantitative approach and collected primary data through a survey at the case company – Staria. Among over 250 personnel, there were 59 respondents from nine departments. The author combined descriptive and exploratory methods to explain the results.
The result described how the ESN boosts employees’ emotional engagement and behavioral engagement, particularly relating this platform to email and intranet. Additionally, the ESN was recognized as an effective tool for the digital workspace during the epidemic. Moreover, the author also discovered the limitations of the ESN for further improvement.
The research finally concluded that using ESN can help to enhance the efficiency of internal communication. The last chapter exhibited recommendations for other academic researchers to develop the thesis idea further and for the company to choose a suitable communication channel and a strategic approach for their internal communication
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
Developing social media presence for B2B clients. Case: Kalmar
Full text linkThis thesis is carried out as a research-based paper for Kalmar - a cargo-handling solutions provider and port automation company. The main objective of the thesis to investigate how to develop a social media presence that is aimed to B2B customers.
In order to achieve the purpose of this thesis, the author developed separate stages to be completed in sequence. Firstly, a literature review was built by gathering a variety of up-to-date social media theories and concepts as a foundation for the later research. Secondly, the author examined and analysed the social media presence of Kalmar, its direct competitors as well as successful B2B practices in Twitter and LinkedIn as a benchmarking study. The benchmarking was mainly done via secondary research and observations over the course of three months. Afterward, a qualitative research was conducted by interviewing Kalmar’s marketing executives and managers to examine its social media awareness as well as define the gap between an effective social media presence in literature review and reality. The key research results were considered next. Lastly, the author discussed the key findings against the literature review and benchmarking, and later recommended actions and solutions that can be applied by the case company.
The results showed that Kalmar is present on social media. However, the case company has not fully utilised these digital tools to gain a competitive edge. In addition, limitations in reaching out to customers—the centre of business—were observed. Therefore, the author proposes a number of further development ideas, for example, customer research, for Kalmar to consider proceeding with in the near future
Analyzing Inclusion Criteria of 7000 Cochrane Systematic Reviews
Full text link"In healthcare, a systematic review is a type of literature review designed to synthesize all available evidence on a given question. To do so, systematic reviewers start with inclusion criteria that help to identify relevant studies that could be included into the review. Identifying what evidence should be included is critical in the systematic reviewing process because it helps reviewers crisply identify what they are looking for, which saves time and effort to screen through the literature. In this project, our objective is to build a machine classifier that categorizes textual descriptions of inclusion criteria taken from over 7000 Cochrane Systematic Reviews to determine whether or not the included articles must be Randomized Control Trials. The ultimate goal of developing such a tool is to analyze the inclusion criteria of existing systematic reviews, to understand what types of evidence are considered relevant for systematic reviews, and to identify Randomized Control Trials in included studies.
Linh Hoang is funded by National Library of Medicine: ""Text
Mining Pipeline to Accelerate Systematic Reviews in Evidence-based Medicine"" (R01LM010817).
Thank you to Cochrane for providing Cochrane reviews as
machine readable XML from which inclusion criteria were
extracted.
This research was done in collaboration with the Department of Statistics, College of Liberal Arts and Sciences and the School of Information Sciences at the University of Illinois at Urbana-Champaign."Open Restriction set for Item 109251 on 2019-01-11T22:21:52Z with date null by [email protected] by Merinda Hensley ([email protected]) on 2019-01-11T22:31:37Z
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Previous issue date: 2018Ope
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
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