Nielsen Method Research Articles

Evaluation of the Usability of Drmyco Web Application Using the Think-Aloud Method

Introduction: Health information technology has great potential to address some of the challenges of developed and developing countries in providing accessible, affordable and high-quality healthcare services. Telemedicine uses health information technology to overcome geographic barriers and increase access to health care services. This is particularly useful for rural and disadvantaged communities in developing countries. There are many reasons for abandoning and failing the web application; one of the most important obstacles to their use is low applicability. The purpose of this study is to investigate the usability of Drmyco web application.Material and Methods: Evaluation was done in a laboratory environment based on a pre-prepared scenario using the think-aloud method by 15 users (health information technology students from all over the country). Then the identified problems and identified problems were classified based on the Van den Haak method. The Nielsen method was used to evaluate the severity of the problems.Results: The average duration of the evaluation process in this study for users was 22.06 minutes. The total number of problems identified by users was 19.Conclusion: The two principles of Layout and Comprehensiveness were identified as the most problems for users.

Review of Nielsen versus SMART in Heuristic Evaluation of Online Transportation Application

The increase in the number of users of online transportation applications is accompanied by a high number of complaints regarding usability issues. Meanwhile, there is the SMART method beside Nielsen’s method for heuristic evaluation that provides more emphasis on mobile application. The purpose of the research is to determine the fittest method in the heuristic evaluation of one of the online transportation applications in Indonesia. The research used a comparative study approach by comparing the number of obtained usability issues from Nielsen’s method and the SMART method. The evaluation process involved three usability experts who identify the usability issues in two types of frameworks, which are Nielsen’s and SMART. The findings of this study indicate that the SMART method discovers a higher number of issues around 7.7% (not significant) compared to the Nielsen method. The SMART method is also able to identify more issues across severity levels 2, 3, and 4. Based on these results, the SMART method is considered may be fitter than Nielsen’s method in evaluating online transportation applications in Indonesia. The research is expected to serve as a reference for conducting evaluations on mobile devices in Indonesia.

The Evaluation of AR Mobile App as a Learning Media for Children

A user evaluation stage is an integral part of designing an application. A practical evaluation can provide an overview of the problems that arise in the application and improve the user experience. The Kupuku application is an augmented reality (AR)-based game application for learning about butterflies. The Kupuku application is specifically intended for children aged 6-13 years. The user sample was selected using a purposive sampling method with the criteria for users of elementary school-age children for the child user segment and their companions as the adult user segment. This study aims to evaluate the usability of the Kupuku game application to users. User evaluation was carried out to measure the application’s usability. The evaluation process was conducted on two user segments, namely 20 child users and 16 adult users. Assessment of children employed the Fun Toolkit and usability factor-based question - Nielsen method. The obtained results showed positive feedbacks. In contrast, the assessment for adult users utilized the system usability scale (SUS) and the user experience questionnaire (UEQ). The SUS score of 76 was included in the good category, and the UEQ score produced an excellent average. The test results indicate that this application can be accepted by users, both children, and adults.

Circuit complexity as a novel probe of quantum entanglement: A study with black hole gas in arbitrary dimensions

In this article, we investigate the quantum circuit complexity and entanglement entropy in the recently studied black hole gas framework using the two-mode squeezed states formalism written in arbitrary dimensional spatially flat cosmological Friedmann-Lema\^{\i}tre-Robertson-Walker background space-time. We compute the various complexity measures and study the evolution of these complexities by following two different prescriptions viz the covariant matrix method and Nielsen's method. Independently, using the two-mode squeezed states formalism we also compute the R\'enyi and von-Neumann entanglement entropy, which show an inherent connection between the entanglement entropy and quantum circuit complexity. We study the behavior of the complexity measures and entanglement entropy separately for three different spatial dimensions and observe various significant different features in three spatial dimensions on the evolution of these quantities with respect to the scale factor. Furthermore, we also study the underlying behavior of the equilibrium temperature with two of the most essential quantities i.e., rate of change of complexity with scale factor and the entanglement entropy. We observe that irrespective of the spatial dimension, the equilibrium temperature depends quartically on entanglement entropy.

Desarrollo de una aplicación móvil utilizando el framework MEAN Stack e IONIC: Un estudio de caso en una compañía de transporte

La utilización de aplicaciones móviles se ha convertido en un componente relevante transaccional dentro de una organización. Por tal motivo, se desarrolló un sistema móvil informativo para la gestión de rutas dentro de la compañía de transporte pesado Torres Revelo S.A, basado en la metodología ágil de desarrollo SCRUM y el framework MEAN Stack e Ionic basados en JavaScript. En este proyecto, se sometió a una prueba de usabilidad en función a la norma ISO/IEC 25010, tomando como referencias la inteligibilidad, aprendizaje, operabilidad, protección frente a errores de usuario, estética y accesibilidad. Se utilizó un cuestionario de 26 preguntas con el uso del método de Nielsen, aplicando a un total de 73 usuarios en todo el proceso del desarrollo de la aplicación, basado en prototipos. Al tabular los resultados obtenidos, se aplicó la prueba de chi cuadrado para determinar que la aplicación móvil y web es fácil de usar, aprender y permite al usuario realizar la trazabilidad de la ruta más corta. Estos procesos permiten tener una mejor gestión de la información dentro de la compañía.

The Seduction of Narrative Desire: An Unnatural Reading of Hermann Broch's

Abstract: Unnatural narratology enhances reader-response theory. In particular, Henrik Skov Nielsen's interpretive praxis can account for texts that resist normal methods of reception, even when they do not adhere to the narratological definition of unnatural. To demonstrate this flexibility, this article adapts Nielsen's praxis to Hermann Broch's Der Tod des Vergil ( The Death of Virgil , 1945), an enigmatic text that puts notions of conventional reception to the test. At first glance, the work flirts with readers' narrative desire, the compulsion for a mimetic, plot-driven interpretation. Nevertheless, subtle semiotic signals unfold through reading that cue an anti-mimetic reading. Against the progressive unfolding of plot, these signals instigate a montage-like reading process in which readers must speculatively reconstruct relations of meaning on their own. Through this speculation, they create a nonlinear "counter-plot," which reconstitutes the unfolding of meaning into a repetitive, labyrinthine practice that spoils narrative satisfaction. Readers thus performatively experience firsthand a demonstrative critique of narrative desire. Nielsen's method can thus account for novel and strange forms of reading, such as "coquettish" texts like Broch's. In this regard, this method contributes to existing discourses on deliberate difficulty as aesthetic tactics.

Studies on nucleation and crystal growth kinetics of ferrous oxalate

An improved apparatus is used for nucleation measurements according to Nielsen's method. A new method is proposed to calculate the dilution ratio N of the reaction solution during nucleation rate determination. With the rule, when the initial apparent supersaturation ratio S’=f(N) in the dilution tank is controlled from 1.3 to 3.0, crystal nucleus dissolving and secondary nucleation can be avoided satisfactorily. Experiments are realized by varying the supersaturation ratio from 15.6 to 93.3 and temperature from 15 °C to 50 °C. Ferrous oxalate is precipitated by mixing equal volumes of ferrous sulfate and oxalic acid solution. The experimental results showed that the nucleation rate of ferrous oxalate in the supersaturation range above is characterized by the primary homogeneous mechanism and can be expressed by the equation RN= ANexp(-Ea/RT)exp[-B/(ln S)2], where AN= 3.9×1013m−3s−1, Ea= 33.9 kJ mol−1, and B =13.7. The crystal growth rate can be expressed by equation G(t)=kgexp(-E'a/RT) (c-ceq)g, where kg= 3.6 × 1013m/s, E'a= 58.0 kJ mol−1, and g = 2.4.

ОБ АЛГОРИТМИЧЕСКИХ ПРОБЛЕМАХ В ГРУППАХ КОКСТЕРА

The main algorithmic problems of group theory posed by M. Dehn are the problem of words, the problem of the conjugation of words for finitely presented groups, and the group’s isomorphism problem. Among the works related to the study of the M. Dehn’s problems, the most outstanding ones are the work of P. S. Novikov who proved the undecidability of the problem of words and the conjugacy problem for finitely presented groups as well as the undecidability of the problem of isomorphism of groups. In this regard, the main algorithmic problems and their various generalizations are studied in certain classes of groups. Coxeter groups were introduced by H. S. M. Coxeter: every reflection group is a Coxeter group if its generating elements are reflections with respect to hyperplanes limiting its fundamental polyhedron. H. S. M. Coxeter listed all the reflection groups in three-dimensional Euclidean space and proved that they are all Coxeter groups and every finite Coxeter group is isomorphic to some reflection group in the three-dimensional Euclidean space which elements have a common fixed point. In an algebraic aspect Coxeter groups are studied starting with works by J. Tits who solved the problem of words in certain Coxeter groups. The article describes the known results obtained in solving algorithmic problems in Coxeter groups; the main purpose of the paper is to analyze of the results of solving algorithmic problems in Coxeter groups that were obtained by members of the Tula algebraic school ’Algorithmic problems of theory of the groups and semigroups ’ under the supervision of V. N. Bezverkhnii. It reviews assertions and theorems proved by the authors of the article for the various classes of Coxeter groups: Coxeter groups of large and extra-large types, Coxeter groups with a tree-structure, and Coxeter groups with n-angled structure. The basic approaches and methods of evidence among which the method of diagrams worked out by van Kampen, reopened by R. Lindon and refined by V. N. Bezverkhnii concerning the introduction of R-cancellations, special R-cancellations, special ring cancellations as well as method of graphs, method of types worked out by V. N. Bezverkhnii, method of special set of words designed by V. N. Bezverkhnii on the basis of the generalization of Nielsen method for free construction of groups. Classes of group considered in the article include all Coxeter groups which may be represented as generalized tree structures of Coxeter groups formed from Coxeter groups with tree structure with replacing some vertices of the corresponding tree-graph by Coxeter groups of large or extra-large types as well as Coxeter groups with n-angled structure.

The phagocytic activity of blood neutrophils in patients with chronic generalized periodontitis of I-II severity level on the background of parasitosis

The article presents the results of a study of phagocytic immunity chain in patients with CGP of I-II severity level on the background of enterobiasis, toxocariasis, giardiasis. The aim of this work was to study the nature of changes in the phagocytic immunity chain in patients with CGP of I-II severity level with parasitoses and patients with CGP without parasitoses. Studies were conducted on 540 patients with CGP, I-II severity level with parasitosis - (principle groups). The comparison group consisted of 90 CGP patients, I-II severity level without parasitosis, the control group – of 30 people without periodontal diseases and chronic diseases of other organs and systems. Phagocytic activity of neutrophils was assessed by their ability to absorb the S.aureus bacteria (strain 209), bactericidal capacity (BC) of phagocytes by the S. Nielsen method. Oxygen-dependent activity of phagocytes was studied in the spontaneous and induced zymosan HCT-test. Statistical processing of materials was made using mathematical statistical methods for the data analysis. There was established a reduction in patients with CGP of I-II severity level with parasitosis and in patients with CGP without parasitosis of the absorption and biocidal ability of peripheral blood neutrophils compared with healthy individuals. At I degree of CGP severity in patients without parasitosis, the number of cells, involved in phagocytosis (FI) was decreased on 13.7%, the number of microbes, absorbed by one cell (FN) on 17.3%, biocide – on 76%. As follows from the obtained data FI and FN in this group of patients did not differ from normal values significantly. In patients with CGP of I-II severity level without parasitosis all three indicators studied had a statistically significant difference. FI was reduced in comparison with the norm on 20.5%, FN – on 24.2%, BC – on 152%. In patients with CGP of I-II severity level with parasitosis the significant differences from the control group were observed both at the I degree of the disease, and at II severity level of the disease. At I degree of severity of the disease, reduction of FI in patients with parasitosis was 22.2 28.0%, FN – 32.8 – 39.7%, BC 158 – 170%, at II degree FI – 29.3 – 34.4 %, FF – 41.4 – 53.5%, BC – 238 – 264%. In patients with CGP of I-II severity level with parasitosis the significant differences compared with patients with CGP of I-II severity level without parasitosis were respectively related to the number of absorbed microbes by a single cell (FN) and biocidal capability of neutrophils (BC). Phagocytic index (PI) of patients with CGP of I-II severity level with parasitosis did not differ significantly from those in patients with CGP of I-II severity level respectively without parasitosis. In patients with CGP of I-II severity level with various forms of parasitosis is reduced as the induced red HCT test, as well as spontaneous HCT test. In patients with CGP of I-II severity level without parasitic, the spontaneous HCT test is increased in comparison with both infested patients, and the control group of individuals.

Theoretical analysis of plate vibration due to acoustic signals

Acoustic emission is high frequency elastic waves produced in a plate under load by the rapid release of strain energy during crack propagation. These waves propagated through the plate material. Knowledge of how the plate is vibrated by acoustic emission resulting from crack growth is an important parameter for crack locating. In this paper vibration behavior of Al–Mg plate due to acoustic signals is modeled. The displacement field was used to derive the governing motion equations of the first-order shear deformation theory for plate by means of Hamilton’s principle. The displacement field was written based as double Fourier series. A MATLAB code according Runge–Kutta numerical method was generated to solve the motion equations of plate. To check the theoretical results, experiments were carried out with four sensors installed on a plate of 5056 Al–Mg with dimensions of 1m∗1m in a rectangular array. An impact was generated by an artificial AE source such as Hsu–Nielsen method of pencil lead breaking (PLB) at any position of the plate. Resonance frequencies of the used AE sensors are employed to investigate the vibration behavior of plate due to acoustic emission. In the next step, Fast Fourier Transform was taken from theoretical and experimental results. Comparing the obtained results showed that the frequency which carried the most amount of energy is approximately the same which confirm performance of the developed analytical model.

Acoustic emission source location in plates using wavelet analysis and cross time frequency spectrum

In this study, the theories of wavelet transform and cross-time frequency spectrum (CTFS) are used to locate AE source with frequency-varying wave velocity in plate-type structures. A rectangular array of four sensors is installed on the plate. When an impact is generated by an artificial AE source such as Hsu–Nielsen method of pencil lead breaking (PLB) at any position of the plate, the AE signals will be detected by four sensors at different times. By wavelet packet decomposition, a packet of signals with frequency range of 0.125–0.25MHz is selected. The CTFS is calculated by the short-time Fourier transform of the cross-correlation between considered packets captured by AE sensors. The time delay is calculated when the CTFS reaches the maximum value and the corresponding frequency is extracted per this maximum value. The resulting frequency is used to calculate the group velocity of wave velocity in combination with dispersive curve. The resulted locating error shows the high precision of proposed algorithm.

Rheological and electrical properties of carbon black and carbon fiber filled cyclic olefin copolymer composites

In this study, morphological, rheological and electrical properties of cyclic olefin copolymer (COC)/carbon black (CB) and COC/carbon fiber (CF) composites were investigated. Rheological measurements indicated that the CB was more effective filler than the CF to improve the viscoelastic parameters such as melt elasticity and dynamic viscosity of samples because of relatively higher surface area and nano size of CB particles. Based on the improvement in melt elasticity of samples depending on the type and amount of filler, the first rheological percolation threshold, the critical filler amount to stepwise change the rheological behavior of composites, were determined to be 9.4 and 15phr for the CB and CF, respectively. It was also found that the local and continuous agglomeration of CB particles predicted by the Kerner–Nielsen method began at the filler amount of 10 and 30phr, respectively. The electrical conductivity measurement performed by an impedance spectroscopy exhibited that the electrical percolation was about 15phr for both fillers. Maximum electrical conductivity vales of 10−2 and 10−1S/cm were obtained by introducing of 40phr of CB and CF, respectively.

An outbreak of visceral coligranuloma in a backyard chicken flock

A rare outbreak of coligranuloma in a backyard chicken flock at the age of 9 weeks occurred on March 2012, in Kermanshah Province, Iran. The flock was raised in poor hygienic conditions. The birds were kept indoor at night on deep wet litter and had access to a small range during the day. They had access to a pond with stagnant water. The affected birds were dull, depressed, and anorectic. The mortality was about 20 birds per 24 h. This mortality rate lasted for 2 weeks. Total mortality reached 20 %. Out of 1,120 chickens that survived and slaughtered at the age of 11 weeks, 571 (51 %) were condemned due to visceral granuloma. At necropsy, affected chickens were poorly fleshed and showed airsaculitis and granulomas. They had masses of whitish-gray nodules on the mesenteries and serosal surface of the intestines. The representative nodules were sectioned and stained with hematoxylin and eosin. Some sections of lesions were stained with periodic acid-Schiff (PAS) and Ziel–Nielsen (ZN) methods. Lesions from affected birds were routinely cultured on blood agar and MacConkey’s agar. At light microscopy, the granulomas were often characterized by accumulations of eosinophilic necrotic debris surrounded by epithelioid cells and multinucleated giant cells. No mycotic forms were seen in slides with PAS stain and no acid-fast organisms were seen in ZN-stained sections. Bacteriological cultures of lesions yielded a non-hemolytic Escherichia coli. Based on gross lesions, histological findings, and results of bacteriological cultures, the condition was confirmed as coligranuloma.

D N / d S does not show positive selection drives separation of polar‐tropical SAR11 populations

Mol Syst Biol. 8: 625 Large‐scale sequencing of environmental microorganisms (including genomes, metagenomes, and metatranscriptomes) now allows researchers to apply sequence‐based evolutionary genetics approaches to microbial ecology questions, including studying how microbes adapt to a diversity of natural environments. There is, however, a danger for misapplication and misinterpretation if the caveats and limitations of these evolutionary methods are not fully appreciated. Here, we highlight an example of such problems in an evolutionary analysis of potential positive selection within strains of SAR11 marine bacteria (Brown et al , 2012). We feel that these issues deserve wider recognition, particularly as evolutionary approaches become more widespread among environmental microbiologists. In the vast majority of genes, the ratio (ω) of non‐synonymous substitutions per non‐synonymous site ( d N ) to synonymous substitutions per synonymous site ( d S ) is 1, then this may be indicative of positive selection favoring amino‐acid replacements (Hughes and Nei, 1988, Hughes, 1999). If ω is not statistically different from 1, then there is evidence for neither purifying nor positive selection. Positive selection is not the only factor that can cause ω to be >1; since ω is a ratio, an unusually high ω value may indicate either an unusually high d N or an unusually low d S . For example, purifying selection on synonymous mutations can lead to a low d S and thus high ω (Parmley and Hurst, 2007). Approaches for calculating d S and d N can be classified into two categories, based on whether the underlying nucleotide evolutionary model takes into account the base/codon frequency bias (Supplementary Table S1; Zhang et al , 2006). For instance, the Yang and Nielsen method (YN00) considers the base/codon …

The Holger Nielsen method of artificial respiration

The Holger Nielsen method of artificial respiration

Nielsen Methods and Groups Acting on Hyperbolic Spaces

We show that for any n & in ℕ there exists a constant C(n) such that any n-generated group G which acts by isometries on a δ-hyperbolic space (with δ>0) is either free or has a nontrivial element with translation length at most δC(n).

The rank of planar discontinuous groups

In [3] H. Zieschang develops the Nielsen method for amalgamated products and uses this to compute the rank of planar discontinuous groups, a originally overlooked case was treated in [1]. In this note we give a short proof of this result using the Nielsen method for groups acting on trees [2].

Determination of nucleation and crystal growth kinetics of barium carbonate

A compact apparatus of specific construction is used for nucleation measurements in accordance with Nielsen's method. Experiments are realized by varying the supersaturation ratio from 35 to 280 and temperature from 10 to 50 °C. Barium carbonate is precipitated by mixing equal volumes of sodium carbonate and barium hydroxide solutions. The experimental data have shown that the nucleation rate of barium carbonate in the supersaturation range cited above is characterized by the primary heterogeneous mechanism and can be expressed by the relation r N= A 0 exp(− E/ RT)exp[− B/((ln S) 2)], where A 0=6.4×10 24 m −3 s −1, E=22,065 J mol −1, and B=58.7. An original method, using a high seed charge in a batch crystallizer, is developed for the determination of crystal growth kinetics in a large range of supersaturation variation. At high supersaturation ratio, the crystal growth rate satisfies a first-order kinetic expression, while at supersaturation ratio values lower than 2, the kinetic expression is second order. These results show that the crystal growth of barium carbonate follows the Burton, Cabrera, and Franck mechanism characterized by the kinetic expression G= αs 2 tanh( β/ s). The fitting of this kinetic expression with all experimental data at 25 °C from low to high supersaturation ratio values using a least-squares technique gives α=9.49×10 −7 m 7 mol −2 s −1 and β=1.35×10 −2 mol m −3.

The Nielsen Method For Groups Acting on Trees

We use Nielsen methods to study generating sets of subgroups of groups that act on simplicial trees and give several applications. In particular, we exhibit an explicit bound for the complexity of acylindrical splittings of a finitely generated group in terms of its rank. This is applied to JSJ-splittings of word-hyperbolic groups and 3-manifolds. As a last application we construct examples of amalgamated products that show that there exists no non-trivial rank formula for amalgamated products. 2000 Mathematical Subject Classification: 20E06, 20E08, 57M27.

THE NIELSEN METHOD FOR GROUPS ACTING ON TREES

We use Nielsen methods to study generating sets of subgroups of groups that act on simplicial trees and give several applications. In particular, we exhibit an explicit bound for the complexity of acylindrical splittings of a finitely generated group in terms of its rank. This is applied to JSJ-splittings of word-hyperbolic groups and 3-manifolds. As a last application we construct examples of amalgamated products that show that there exists no non-trivial rank formula for amalgamated products. 2000 Mathematical Subject Classification: 20E06, 20E08, 57M27.