scholarly journals An algorithm for estimating surface normal from its boundary curves

2014 ◽  
Vol 2 (1) ◽  
pp. 67-72 ◽  
Author(s):  
Jisoon Park ◽  
Taewon Kim ◽  
Seung-Yeob Baek ◽  
Kunwoo Lee

Abstract Recently, along with the improvements of geometry modeling methods using sketch-based interface, there have been a lot of developments in research about generating surface model from 3D curves. However, surfacing a 3D curve network remains an ambiguous problem due to the lack of geometric information. In this paper, we propose a new algorithm for estimating the normal vectors of the 3D curves which accord closely with user intent. Bending energy is defined by utilizing RMF(Rotation-Minimizing Frame) of 3D curve, and we estimated this minimal energy frame as the one that accords design intent. The proposed algorithm is demonstrated with surface model creation of various curve networks. The algorithm of estimating geometric information in 3D curves which is proposed in this paper can be utilized to extract new information in the sketch-based modeling process. Also, a new framework of 3D modeling can be expected through the fusion between curve network and surface creating algorithm.

2014 ◽  
Vol 106 (9) ◽  
pp. 925-933 ◽  
Author(s):  
Zhenrong Zheng ◽  
Xiaoming Zhao ◽  
Chunhong Wang ◽  
Xiaojun Sun

2021 ◽  
Vol 12 (4) ◽  
pp. 15
Author(s):  
Tareq Alfraidi

The concept of Theme is regarded as a functional linguistic element that exists in many languages. The main aim of this study is to explore the functions of Theme in Arabic, applying the Systemic Functional Linguistics framework adopted by Downing (1991). Methodologically, several related real examples have been selected from the written discourse of Modern Standard Arabic and then analyzed contextually. The empirical analysis has revealed that (i) Theme can provide different functions, such as Individual, Circumstantial and Subjective and Logical Frameworks for the interpretation of the Rheme, and (ii) Theme can interact dynamically with different grammatical functions (e.g. Subject, Object, etc.) and have different pragmatic functions (e.g. Topic, Given and New information). Therefore, the view that makes a necessary link between Theme on the one hand and Noun Phrase, Topic or Given information on the other hand is proven incorrect and empirically invalid. Similar results have been obtained in the context of English (Downing 1991) but not yet for Arabic? This strengthens not only the universality of the concept of Theme but also its functions.


2021 ◽  
Vol 36 ◽  
pp. 11-24
Author(s):  
Dorota Małgorzata Rynio

In the times of quick and widespread changes, innovations and new ways of city management, new approaches to planning of strategic development of urban entities are expected. Therefore there is a continuing search for possibilities of acquiring new information about the city market and ways to shape it, residents’ participation and involvement, and also creating city openness. Urban centres are not closed entities but they have strong relations with the local, domestic and global markets. There is a search for new directions and priorities in strategic planning of social and economic development, while the established goals follow consultations, workshops and meetings of various groups of urban stakeholders. The consequences of long-term implementation of a city’s image as open is, on the one hand, its recognisability, yet – on the other one – the experience of positive and negative effects of the implementation. The purpose of the study is to identify selected contemporary conditions of strategic planning of a city’s social and economic development, emphasising – in particular – the bases for creating a city’s openness, including the related opportunities and hazards. Another intention is to highlight innovative ways of collecting market information about needs and aspirations of city users, as well as to form the residents’ attitude towards their involvement in the development of their living space. The applied research methods include literature studies, benchmarking and reasoning.


2004 ◽  
Vol 14 (2) ◽  
pp. 263-300 ◽  
Author(s):  
DAVID C. REISMAN

My aim here is to present an editio princeps of a newly discovered Arabic translation of a very important passage from Plato's Republic (Book VI, 506d3–509b10) found in the work entitled Kitāb fī Masā'il al-umūr al-ilāhiyya (hereafter Masā'il), penned by the somewhat obscure Neoplatonist Abū Hāmid al-Isfizārī (fl. mid-fourth / tenth c.). While an edition of al-Isfizārī's work has been published by Daniel Gimaret, the manuscript he used (Ragıp Paşa 1463) lacked the literal translation of the Republic passage. The one other known exemplar of the work, MS Zāhiriyya 4871, dated slightly later than the first, appears to be closer to the author's original unedited version; it contains the Republic passage. I am currently preparing a new edition of the work on the basis of the Zāhiriyya manuscript, but it seemed worthwhile to bring the Republic passage to immediate attention. I do not attempt here a thorough evaluation of al-Isfizārī's philosophy as presented in the Masā'il; this can be done successfully only upon completion of the edition. However, to place the work in its proper context, I do provide a brief overview of the transmission of Plato's Republic in Arabic; a discussion of new information on al-Isfizārī's Nachlass, and a description of the two exemplars of his Masā'il. The edited text of the passage from the Republic is accompanied by a provisional translation.


Author(s):  
Joseph Walker

This is the Information Age, and that epicenter is information flow and content control. This is the one occupation that is best suited to benefit from this still evolving epoch of human history. In fact, any organization that fundamentally relies on information dissemination as a core resource to their production would seek out information experts as the de facto experts in this field for consultation on how best to handle their large volumes of information. Today, companies are searching for these very professionals and will pay extraordinarily well to have such expertise in their organizations. As long as they change their mindset, evolve from conservative ideologies of what a library professional is, and retain and improve upon the traditional library services while seeking to develop techniques and technologies that effectively handle the workflow of the information dissemination process in a Digital Age—adapting technologies such as the KATIE Index, the MEL System, and the LISA Informationbase for the physical and virtual collection management requirements—most library professionals will be able to focus on becoming information experts and establish their relevance at the very epicenter of business and education. Evolving into the information expert and leveraging new information technologies is where the future of library studies lays in this digital segment of the Information Age. This chapter concludes the first section of the book.


2020 ◽  
Vol 30 (Supplement_5) ◽  
Author(s):  
M Grbic ◽  
D Stimac Grbic ◽  
L Stimac ◽  
Z Sostar

Abstract Introduction The coronavirus outbreak has set off alarms around the world, leading to border closures, trade controls, travel bans and other measures. The Wuhan coronavirus epidemic continues to spread globally to the new European hotspot in Italy. New information about the epidemic and the virus is changing rapidly as the virus spreads and appears in parts of the world. Although official announcements by the Croatian Government and Crisis Staff calmed the public with pictures and data on the disease, it showed something else that heightened public concern and caused two conflicting phenomena among citizens - on the one hand, the majority showed understandable doubt about the information that could have raised the concern for their own health while the rest of the population ignored the facts. The market showed complete unwillingness to cope with this epidemic and a chronic shortage of protective equipment (masks, disinfectants...) emerged. Most of the citizens' queries and concerns were moving in the direction of personal protection, child protection and justification for holding large gatherings. Results By March 8, 2020, twelve COVID-19 patients were recorded in Croatia, of which 5 were patients in Rijeka, 3 in Zagreb and 4 in Varaždin. The first sick person is a Croatian citizen from Zagreb who became infected during his stay in Italy (Milan, Lombardy province). Conclusions In this crisis, several basic principles of crisis communication with the public have been forgotten: The first source of communication often becomes the source against which everyone else is measured.Accuracy is crucial to credibility.Emotion cannot be countered by facts. People must first know that the government cares.The public should regain a sense of control over circumstances beyond control.A lack of public respect in a crisis undermines trust.Honesty is fundamental to maintaining trust. Key messages Accuracy is crucial to credibility. Emotion cannot be countered by facts.


Mathematics ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 103 ◽  
Author(s):  
Cristina Amorós ◽  
Ioannis K. Argyros ◽  
Daniel González ◽  
Ángel Alberto Magreñán ◽  
Samundra Regmi ◽  
...  

There is a need to extend the convergence domain of iterative methods for computing a locally unique solution of Banach space valued operator equations. This is because the domain is small in general, limiting the applicability of the methods. The new idea involves the construction of a tighter set than the ones used before also containing the iterates leading to at least as tight Lipschitz parameters and consequently a finer local as well as a semi-local convergence analysis. We used Newton’s method to demonstrate our technique. However, our technique can be used to extend the applicability of other methods too in an analogous manner. In particular, the new information related to the location of the solution improves the one in previous studies. This work also includes numerical examples that validate the proven results.


1943 ◽  
Vol 4 (12) ◽  
pp. 271-275

Walcot Gibson was born at Bromsgrove, Worcestershire, on 24 August 1864. His father was a bank manager from the north country and his mother was Cornish, and they had three sons and one daughter. Gibson was educated at the Bromsgrove School and about 1882 went to Mason College, Birmingham, now the University of Birmingham. Charles Lapworth who had distinguished himself by his great researches in the south of Scotland had just been appointed to the chair of Geology at Mason College and thirty-one years later (1913) he records that Gibson was his first geological pupil. His interest in geology and geological mapping was developed by intimate contact with Lapworth and was sustained by a coterie of ardent amateur geologists, among them Joseph Landon, Fred Cullis and C. J. Gilbert. This period clearly determined Gibson’s choice of a career. After a course at the Royal College of Science he set out in 1889 on Lapworth’s advice for South Africa where he was engaged for two years on mineral surveys in the Rand goldfields and elsewhere. From there he moved to East Africa where he was engaged for another two years on mineral surveys for the East Africa Company. He returned to this country an experienced geologist and surveyor and in 1893 he joined H.M. Geological Survey in which service he remained for thirty-two years until his retirement in 1925. This was an important period in the history of the Geological Survey for owing to strong representations that the old Survey had become obsolete both in topography and geology, the House of Commons in 1891 sanctioned a resurvey of the great South Wales Coalfield on the scale of six inches to the mile. The first mapping of that field initiated by Logan and de la Beche was on the one-inch scale and was completed about 1845, the year in which the Geological Survey was transferred from the Board of Ordnance. The enormous developments which had taken place since the original survey had far outstripped the knowledge of the geological structure of the field and new information had become urgently necessary.


1986 ◽  
Vol 113 (2) ◽  
pp. 175-180 ◽  
Author(s):  
W. Kortlandt ◽  
A. A. De Rotte ◽  
C. J. M. Arts ◽  
R.J. M. Croughs ◽  
J. H. H. Thijssen

Abstract. We report new information on the presence of α-melanotropin(α-MSH)-like immunoreactivity in the peripheral circulation of the adult human. Pooled blood from 20 patients with non-endocrine diseases was subjected to a Sep-pak pre-purification followed by a high pressure liquid chromatographic (HPLC) fractionation. The eluate from the HPLC column was analyzed by a radioimmunoassay (RIA) specific for the C-terminal part of the α-MSH molecule. From this it appeared that α-MSH was the major α-MSH-like immunoreactive peptide present in human blood with a level of 2–5 pg/ml. This level is similar to the one determined by direct measurements in Sep-pak pre-purified human plasma (median 2.0 pg/ml, n = 11). Des-acetyl α-MSH was present in human blood in only a minor quantity. We discuss this finding in view of earlier reports on α-MSH-like immunoreactivity in human pituitary tissue.


2010 ◽  
Vol 37-38 ◽  
pp. 1050-1055
Author(s):  
Jiang Hua Ge ◽  
Ping Zhang ◽  
Xiu Lin Sui ◽  
Ping Zhao

In this paper, a new mathematical model and modeling method of ball-end milling cutter which satisfies the request of physical simulation in virtual NC machining system are proposed. The accurate expressions of the cutting edge are presented. The precise functional surface model of ball-end cutter is developed. And the 3-D visualization for ball-end milling cutter in virtual NC machining is implemented. The model can provide necessary and accurate geometric information for physical simulation and has been applied in milling force simulation. It laid the foundation for integration of geometric simulation and physical simulation.


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