The Quality of Approximation of Brun's Algorithm in Three Dimensions

2001 ◽  
Vol 134 (2) ◽  
pp. 143-157 ◽  
Author(s):  
B. R. Schratzberger
Keyword(s):  
Three Dimensions ◽  
Quality Of Approximation

scholarly journals Walking on Kendall’s Shape Space: Understanding Shape Spaces and Their Coordinate Systems

2020 ◽  
Vol 47 (4) ◽  
pp. 334-352
Author(s):  
Christian Peter Klingenberg
Keyword(s):  
Shape Change ◽  
Shape Space ◽  
Three Dimensions ◽  
Simulation Studies ◽  
Shape Spaces ◽  
Closed Surfaces ◽  
Local Approximations ◽  
Quality Of Approximation ◽  
Available Information

Abstract More and more analyses of biological shapes are using the techniques of geometric morphometrics based on configurations of landmarks in two or three dimensions. A fundamental concept at the core of these analyses is Kendall’s shape space and local approximations to it by shape tangent spaces. Kendall’s shape space is complex because it is a curved surface and, for configurations with more than three landmarks, multidimensional. This paper uses the shape space for triangles, which is the surface of a sphere, to explore and visualize some properties of shape spaces and the respective tangent spaces. Considerations about the dimensionality of shape spaces are an important step in understanding them, and can offer a coordinate system that can translate between positions in the shape space and the corresponding landmark configurations and vice versa. By simulation studies “walking” along that are great circles around the shape space, each of them corresponding to the repeated application of a particular shape change, it is possible to grasp intuitively why shape spaces are curved and closed surfaces. From these considerations and the available information on shape spaces for configurations with more than three landmarks, the conclusion emerges that the approach using a tangent space approximation in general is valid for biological datasets. The quality of approximation depends on the scale of variation in the data, but existing analyses suggest this should be satisfactory to excellent in most empirical datasets.

Evaluation of the Academic Setting in Spain 1This study was financed by the University of Oviedo.

1995 ◽  
Vol 11 (2) ◽  
pp. 133-137 ◽  
Author(s):  
Juan Fernández ◽  
Miguel A. Mateo ◽  
José Muñiz
Keyword(s):  
Higher Education ◽  
Decision Making ◽  
Social Climate ◽  
Three Dimensions ◽  
Academic Setting ◽  
Teaching And Research ◽  
Evaluation Questionnaire ◽  
University Teachers ◽  
The University

The conditions are investigated in which Spanish university teachers carry out their teaching and research functions. 655 teachers from the University of Oviedo took part in this study by completing the Academic Setting Evaluation Questionnaire (ASEQ). Of the three dimensions assessed in the ASEQ, Satisfaction received the lowest ratings, Social Climate was rated higher, and Relations with students was rated the highest. These results are similar to those found in two studies carried out in the academic years 1986/87 and 1989/90. Their relevance for higher education is twofold because these data can be used as a complement of those obtained by means of students' opinions, and the crossing of both types of data can facilitate decision making in order to improve the quality of the work (teaching and research) of the university institutions.

scholarly journals The conceptualisation of vital communities related to ageing in place: a scoping review

2021 ◽  
Author(s):  
Katinka E. Pani-Harreman ◽  
Joop M. A. van Duren ◽  
Gertrudis I. J. M. Kempen ◽  
Gerrie J. J. W. Bours
Keyword(s):  
Older People ◽  
Scoping Review ◽  
Health Care Professionals ◽  
Living Environment ◽  
Three Dimensions ◽  
Informal Networks ◽  
Ageing In Place ◽  
Additional Support ◽  
People Today

AbstractOlder people today are more likely to age in their own private living environment. However, many face declining health and/or other issues that affect their ability to live independently and necessitate additional support. Such support can be provided by formal networks, but a considerable part can also be offered by informal networks of older people themselves. Going beyond these networks, older people can additionally and perhaps even more substantially benefit from vital communities. Nevertheless, even though this term is increasingly common in the literature, its meaning remains indistinct. A more thorough understanding of this concept might provide valuable knowledge that health care professionals, researchers and community workers can use to offer meaningful and effective support. The purpose of this paper is to draw on existing empirical research on vital communities to build knowledge of the different descriptions and dimensions of the concept. Arksey and O’Malley’s scoping review methodology was adopted. Our search, conducted on 23 March 2020 and updated on 06 January 2021, yielded 4433 articles, of which six articles were included in the scoping review. We deduced that the conceptualisation of a vital community is based on three dimensions: the aim of a vital community, the processes behind a vital community and the typical characteristics of a vital community. None of the selected studies have mapped all three dimensions. Nevertheless, we assume that understanding all three matters when vital communities aim to contribute to the quality of life of people ageing in place.

scholarly journals PARALLEL DELAUNAY REFINEMENT: ALGORITHMS AND ANALYSES

2007 ◽  
Vol 17 (01) ◽  
pp. 1-30 ◽  
Author(s):  
DANIEL A. SPIELMAN ◽  
SHANG-HUA TENG ◽  
ALPER ÜNGÖR
Keyword(s):  
Mesh Size ◽  
Constant Factor ◽  
Two Dimensions ◽  
Three Dimensions ◽  
Delaunay Refinement ◽  
Steiner Points ◽  
Input Domain ◽  
Set Of Points ◽  
Refinement Algorithm

We present a parallel Delaunay refinement algorithm for generating well-shaped meshes in both two and three dimensions. Like its sequential counterparts, the parallel algorithm iteratively improves the quality of a mesh by inserting new points, the Steiner points, into the input domain while maintaining the Delaunay triangulation. The Steiner points are carefully chosen from a set of candidates that includes the circumcenters of poorly-shaped triangular elements. We introduce a notion of independence among possible Steiner points that can be inserted simultaneously during Delaunay refinements and show that such a set of independent points can be constructed efficiently and that the number of parallel iterations is O( log 2Δ), where Δ is the spread of the input — the ratio of the longest to the shortest pairwise distances among input features. In addition, we show that the parallel insertion of these set of points can be realized by sequential Delaunay refinement algorithms such as by Ruppert's algorithm in two dimensions and Shewchuk's algorithm in three dimensions. Therefore, our parallel Delaunay refinement algorithm provides the same shape quality and mesh-size guarantees as these sequential algorithms. For generating quasi-uniform meshes, such as those produced by Chew's algorithms, the number of parallel iterations is in fact O( log Δ). To the best of our knowledge, our algorithm is the first provably polylog(Δ) time parallel Delaunay-refinement algorithm that generates well-shaped meshes of size within a constant factor of the best possible.

Service journey quality: conceptualization, measurement and customer outcomes

2021 ◽  
Vol 32 (6) ◽  
pp. 1-27
Author(s):  
Elina Jaakkola ◽  
Harri Terho
Keyword(s):  
Service Quality ◽  
Service Delivery ◽  
Customer Loyalty ◽  
Financial Services ◽  
Three Dimensions ◽  
Service Research ◽  
Research Approach ◽  
Critical Determinant ◽  
Content Type

PurposeThe quality of the customer journey has become a critical determinant of successful service delivery in contemporary business. Extant journey research focuses on the customer path to purchase, but pays less attention to the touchpoints related to service delivery and consumption that are key for understanding customer experiences in service-intensive contexts. The purpose of this study is to conceptualize service journey quality (SJQ), develop measures for the construct and study its key outcomes.Design/methodology/approachThe study uses a discovery-oriented research approach to conceptualize SJQ by synthesizing theory and field-based insights from customer focus group discussions. Next, using consumer survey data (N = 278) from the financial services context, the authors develop measures for the SJQ. Finally, based on an additional survey dataset (N = 239), the authors test the nomological validity and predictive relevance of the SJQ.FindingsSJQ comprises of three dimensions: (1) journey seamlessness, (2) journey personalization and (3) journey coherence. This study demonstrates that SJQ is a critical driver of service quality and customer loyalty in contemporary business. This study finds that the loyalty link is partially mediated through service quality, indicating that SJQ explains loyalty above and beyond service quality.Research limitations/implicationsSince service quality only partially mediates the link between service journey quality and customer loyalty, future studies should examine alternative mediators, such as customer experience, for a more comprehensive understanding of the performance effects.Practical implicationsThe study offers concrete tools for service managers who wish to understand and develop the quality of service journeys.Originality/valueThis study advances the service journey concept, demonstrates that the quality of the service journey is a critical driver of customer performance and provides rigorous journey constructs for future service research.

Measurement of cortical plate volume based on CBCT of frontal teeth in studies with retrusion and normality

2021 ◽  
pp. 17-21
Author(s):  
N. G. Meskhiya ◽  
I. S. Kopetskiy ◽  
I. A. Nikolskaya ◽  
D. A. Eremin ◽  
O. N. Kovaleva
Keyword(s):  
Orthodontic Treatment ◽  
Soft Tissues ◽  
Three Dimensions ◽  
Cone Beam ◽  
Cortical Plate ◽  
Imaging Method ◽  
New Approach ◽  
Accuracy Of Measurements ◽  
Bone Structures

Cone Beam Computed Tomography (CBCT) is the preferred imaging method for a comprehensive orthodontic examination. Thanks to the development of this technique, clinicians today can make most accurate measurements without fear of errors associated with projection distortion or localization of landmarks on radiographs. The quality of CBCT images gives to orthodontists the ability to analyze bone structures, teeth (even impacted teeth), and soft tissue in three dimensions. The accuracy of measurements of hard and soft tissues from CBCT images determines the accuracy of diagnosis and treatment planning. A fundamentally new approach has been proposed, which makes it possible to thoroughly study the bone tissue surrounding the tooth at the stages of planning orthodontic treatment. Аnalysis of radiation studies of patients with dentoalveolar anomalies was carried out to select the optimal treatment tactics and to control its effectiveness.

scholarly journals Evaluasi Kualitas Layanan Website Alumni Menggunakan Metode Webqual 4.0

2019 ◽  
Vol 5 (2) ◽  
pp. 105
Author(s):  
Anisa Yulandari ◽  
Wing Wahyu Winarno ◽  
Asro Nasiri
Keyword(s):  
Quality Of Service ◽  
User Satisfaction ◽  
Information Quality ◽  
Three Dimensions ◽  
Job Seekers ◽  
End User ◽  
Interaction Quality ◽  
Service Interaction

Website Portal Alumni Amikom Yogyakarta yang dapat diakses pada alamat domain alumni.amikom.ac.id merupakan bagian dari Universitas Amikom Yogyakarta yang berfungsi sebagai sarana berbagi informasi sekaligus bertindak sebagai penghubung antara perusahaan pencari tenaga kerja dan para pencari kerja khususnya alumni Universitas Amikom Yogyakarta. Selama ini website alumni sudah berjalan belum dilakukan evaluasi terhadap kualitas layanan website yang didasarkan pada persepsi pengguna akhir sebagai umpan balik kepada pengelola website sehingga pengelola dapat mengetahui sejauh mana kepuasan pengguna dan kualitas layanan yang sudah diberikan. Tujuan dari penelitian ini yaitu untuk mengetahui kualitas layanan website alumni menggunakan tiga dimensi yang ada pada metode Webqual 4.0. Tiga dimensi itu sendiri terdiri dari Kegunaan, Kualitas Informasi, dan Kualitas Interaksi Layanan. Pendistribusian kuisioner dilakukan terhadap 200 sampel responden. Kesimpulan dari penelitian ini adalah adanya pengaruh ketiga dimensi Webqual 4.0 terhadap kepuasan pengguna. Dimensi yang paling berpengaruh yaitu Kualitas Informasi dan Kualitas Interaksi Layanan. Hal ini berarti peningkatan dapat dilakukan pada indicator yang memiliki nilai rata-rata terendah. Peningkatan pada dimensi Kualitas Informasi dapat dilakukan perbaruan secara berkala sehingga informasi yang disajikan menjadi lebih relevan. Sedangkan untuk dimensi Kualitas Interaksi Layanan dapat dilakukan dengan meningkatkan pelayanan terhadap keluhan seputar website alumni.Kata Kunci — Kualitas Layanan, Website Alumni, Webqual 4.0The Alumni Amikom Yogyakarta Website which can be accessed at the domain address alumni.amikom.ac.id is part of the Amikom University of Yogyakarta which serves as a means of sharing information while acting as a liaison between the company and job seekers, especially alumni of Yogyakarta Amikom University. So far, the alumni website has been running, yet an evaluation of the quality of website services has been carried out based on the perception of the end user as feedback to the website manager so that the manager can find out how far the user satisfaction is and the quality of the service provided. The purpose of this study is to determine the quality of the alumni website service using three dimensions that exist in the method of Webqual 4.0, there are Usability, Information Quality, and Service Interaction Quality. The conclusion of this study is the influence of the three dimensions of Webqual 4.0 on user satisfaction. The most influential dimensions are Information Quality and Service Interaction Quality. This means that an increase can be made on an indicator that has the lowest average valueKeywords— Quality of Service, Alumni Website, Webqual 4.0

scholarly journals How Kindergarten Teachers Assess Their Own Professional Competencies

2021 ◽  
Vol 11 (12) ◽  
pp. 769
Author(s):  
Eva Pupíková ◽  
Dalibor Gonda ◽  
Kitti Páleníková ◽  
Janka Medová ◽  
Dana Kolárová ◽  
...  
Keyword(s):  
Classroom Management ◽  
Content Knowledge ◽  
Educational Needs ◽  
Kindergarten Teachers ◽  
Further Education ◽  
Three Dimensions ◽  
Self Assessment ◽  
Teaching Competencies ◽  
Four Dimensions

One of the requirements of Education 4.0 is that students and practitioners should be involved in the creation of the content of study plans. Therefore, in the present research we focused on identifying the further educational needs of kindergarten teachers. Teachers’ educational needs were divided into four dimensions: ‘content knowledge’, ‘diagnostic knowledge’, ‘didactical knowledge’, and ‘classroom management knowledge’. In parallel, we discovered how teachers assess the level of their own teaching competencies. Based on the obtained data, we identified that teachers have the greatest need for further education in the dimension of ‘diagnostic knowledge’ and that the need for their further education in this dimension did not depend on the length of practice. In the other three dimensions, a declining trend in teachers’ educational needs has been recorded with an increasing length of practice, declining significantly in three of the four dimensions examined. The study points to the need to create in-service courses for kindergarten teachers to deepen their ‘diagnostic knowledge’ and thus ensure the sustainability of the quality of pre-school education for children. Teachers‘ self-assessment of their own teaching competencies corresponds to their educational needs, which supports the relevance of the findings on the further educational needs of kindergarten teachers. This study aimed to obtain relevant data on which the improvement of the higher education of future kindergarten teachers might be based. At the same time, this would allow the analysis and tailoring of the content of professional development courses to the needs of in-service kindergarten teachers.

scholarly journals The relationship between the perceived class climate, motivation for achievement and school success among elementary and high school students

2019 ◽  
Vol 51 (2) ◽  
pp. 426-460
Author(s):  
Irina Milosevic ◽  
Ruzenka Simonji-Cernak
Keyword(s):  
High School ◽  
High School Students ◽  
School Success ◽  
Attitude Scale ◽  
Three Dimensions ◽  
School Students ◽  
Class Climate ◽  
Positive Correlations ◽  
The Relationship

The aim of this research is to determine the correlation between perceived class climate, motivation for achievement and school success among elementary and high school students. The research was conducted on a sample of 400 subjects. The instrument used for class climate survey is an Attitude scale, created as the combination of two instruments for measuring class climate. The MOP/D scale was used to survey motivation for achievement. The obtained results show that the quality of the overall class climate is not high, while the scores on the three dimensions of the class climate indicate that the students perceive Class Cohesion as the most favourable one, then the Teachers? Support and finally the Order and the Organisation. Significant differences in perceptions of class climate were found concerning age. Significant differences in perceptions of climate (both in the overall and in the Teachers? Support dimension) were also found with respect to the gender of the students. The findings indicate low positive correlations between perceived class climate and the motivation for achievement, and also between school success and the motivation for achievement. No correlation was found between the perceived class climate and school success. More detailed research shows that the climate dimensions Teachers? Support and Order and Organisation are significant predictors of the overall motivation for achievement and the Learning dimension, and that they are positively correlated. Learning and Persistence, the dimensions of the motivation for achievement, were found to be significant predictors of school success. A perceived class climate did not prove to be a significant predictor of school success, except for the Class Cohesion dimension, only on the subsample of high school students.

scholarly journals KEPEMIMPINAN PEMBELAJARAN KEPALA SEKOLAH DALAM MENINGKATKAN HASIL BELAJAR SISWA

2020 ◽  
Vol 31 (2) ◽  
pp. 47-55
Author(s):  
Ahmad Wahyudi ◽  
Sabar Narimo ◽  
Wafroturohmah Wafroturohmah Wafroturohmah
Keyword(s):  
School Climate ◽  
Learning Outcomes ◽  
Student Learning Outcomes ◽  
Three Dimensions ◽  
Quality Of Education ◽  
Descriptive Data ◽  
Leadership Model ◽  
Improving Student Learning ◽  
Good Learning

This study has two objectives, namely to describe the implementation of learning leadership by principals in improving student learning outcomes. This is a qualitative research that produces descriptive data in the form of written or oral words from people and observable behavior. This research applied interview, observation and documentation in collecting the data. For analyzing the data, this research used a nonstatistic method, namely descriptive data analysis. It means that the data obtained through research on the implementation of learning leadership by principals and is reported as it is. Then, the data were analyzed descriptively to get an overview of the facts. Based on the results of research conducted in SMK Pelita Bangsa Sumberlawang, it can be concluded that the principal is the most important element in improving the quality of education. To be able to improve the quality of education, principals must conduct good learning leadership. The implementation of learning leadership in SMK Pelita Bangsa Sumberlawang in terms of the learning leadership model expressed by Hallinger and Murphy is divided into three dimensions, namely through the formulation of school missions, management of good learning and creating a conducive school climate. These three dimensions are then specified into eleven descriptors.

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