Feature-Based Solid Model Reconstruction

2013 ◽  
Vol 13 (1) ◽  
Author(s):  
Jun Wang ◽  
Dongxiao Gu ◽  
Zhanheng Gao ◽  
Zeyun Yu ◽  
Changbai Tan ◽  
...  
Keyword(s):  
Model Building ◽  
Parameter Extraction ◽  
Solid Model ◽  
Model Reconstruction ◽  
Reconstruction Process ◽  
Input Surface ◽  
Solid Models ◽  
History Of ◽  
Feature Based ◽  
Complete History

In this paper, we propose an effective solution to reconstruct solid models of existing objects. Specifically, we convert the model reconstruction problem into the issue of feature parameter extraction, and thereby design diverse methods to extract the parameters of basic design features from input surface meshes. After extracting the feature parameters, the corresponding features are constructed. By performing modeling operations on those features, the final solid model is constructed, and meanwhile the complete history of the model building operations is recorded. By introducing the concepts of “feature,” “constraint,” and “modeling history” into the reconstruction process, the design intent is captured and hence represented in the reconstructed model. As a result, the model is geometrically accurate and topologically consistent, and moreover it is flexibly editable, which makes it convenient to carry out model redesign and modification for the innovation applications. A variety of experimental results demonstrate the effectiveness and robustness of this solution.

Multi-Resolution Modeling of Feature-Based Solids Based on Non-Manifold Topological Framework

2005 ◽  
Author(s):  
Sang Hun Lee ◽  
Kyu-Yeul Lee
Keyword(s):  
Collaborative Design ◽  
Virtual Prototyping ◽  
Boolean Operations ◽  
New Approach ◽  
Levels Of Detail ◽  
Solid Models ◽  
History Of ◽  
Feature Based ◽  
Multiresolution Modeling ◽  
Commutative Property

The requirements of multi-resolution models of feature-based solids, which represent an object at many levels of feature detail, are increasing for engineering purposes, such as analysis, network-based collaborative design, virtual prototyping and manufacturing. To provide multi-resolution models for various applications, it is essential to generate adequate solid models at varying levels of detail (LOD) after feature rearrangement, based on the LOD criteria. However, the non-commutative property of the union and subtraction Boolean operations is a severe obstacle to arbitrary feature rearrangement. To solve this problem we propose a new approach based on the non-manifold topological representation and the merge-and-select algorithm for non-manifold Boolean operations. In this approach, the merge-and-select algorithm is modified to satisfy the commutative law between union and subtraction operations by considering the history of the Boolean operations. Because this algorithm guarantees the same resulting shape as the original and reasonable shapes at the intermediate LODs for an arbitrary rearrangement of its features, various LOD criteria can be applied for multiresolution modeling in different applications.

Progressive Solid Models for Internet-Based Design and Collaboration

2002 ◽  
Author(s):  
Jae Yeol Lee ◽  
Joo-Haeng Lee ◽  
Hyun Kim ◽  
Hyung Sun Kim
Keyword(s):  
The Other ◽  
Compact Model ◽  
Solid Model ◽  
Progressive Mesh ◽  
Solid Models ◽  
Feature Based ◽  
Model Size ◽  
Mesh Models ◽  
Cellular Topology ◽  
Advanced Applications

Progressive mesh representation and generation have become one of the most important issues in network-based computer graphics. However, current researches are mostly focused on triangular mesh models. On the other hand, solid models are widely used in industry and are applied to advanced applications such as product design and virtual assembly. Moreover, as the demand to share and transmit these solid models over the network is emerging, the representation and the generation of progressive solid models depending on specific engineering needs and purpose are essential. In this paper, we present a Cellular Topology-based approach to generating progressive solid models from a feature-based solid model for internet-based design and collaboration. The proposed approach introduces a new scheme for storing and transmitting solid models over the network. The Cellular Topology (CT) approach makes it possible to effectively generate progressive solid models and to efficiently transmit the models over the network with compact model size. Thus, an arbitrary solid model SM designed by a set of design features is stored as a much coarser solid model SM0 together with a sequence of n detail records that indicate how to incrementally refine SM0 exactly back into the original solid model SM = SMn.

scholarly journals Ten years of molecular ballistics—a review and a field guide

2021 ◽  
Author(s):  
Jan Euteneuer ◽  
Cornelius Courts
Keyword(s):  
Model Building ◽  
Crime Scene ◽  
Forensic Evidence ◽  
Biological Targets ◽  
Contrast Method ◽  
History Of ◽  
Scene Investigation ◽  
Blood Pattern Analysis ◽  
Wound Ballistic ◽  
Objective Investigation

AbstractMolecular ballistics combines molecular biological, forensic ballistic, and wound ballistic insights and approaches in the description, collection, objective investigation, and contextualization of the complex patterns of biological evidence that are generated by gunshots at biological targets. Setting out in 2010 with two seminal publications proving the principle that DNA from backspatter collected from inside surfaces of firearms can be retreived and successfully be analyzed, molecular ballistics covered a lot of ground until today. In this review, 10 years later, we begin with a comprehensive description and brief history of the field and lay out its intersections with other forensic disciplines like wound ballistics, forensic molecular biology, blood pattern analysis, and crime scene investigation. In an application guide section, we aim to raise consciousness to backspatter traces and the inside surfaces of firearms as sources of forensic evidence. Covering crime scene practical as well as forensic genetic aspects, we introduce operational requirements and lay out possible procedures, including forensic RNA analysis, when searching for, collecting, analyzing, and contextualizing such trace material. We discuss the intricacies and rationales of ballistic model building, employing different tissue, skin, and bone simulants and the advantages of the “triple-contrast” method in molecular ballistics and give advice on how to stage experimental shootings in molecular ballistic research. Finally, we take a look at future applications and prospects of molecular ballistics.

Empedocles' Cosmic Cycle

1967 ◽  
Vol 17 (1) ◽  
pp. 29-40
Author(s):  
Denis O'Brien
Keyword(s):  
Complete Study ◽  
History Of ◽  
Complete History

Hitherto reconstructions of Empedocles' cosmic cycle have usually been offered as part of a larger work, a complete history of Presocratic thought, or a complete study of Empedocles. Consequently there has perhaps been a lack of thoroughness in collecting and sifting evidence that relates exclusively to the main features of the cosmic cycle.

A STUDY OF ETIOPATHOGENESIS OF MIDDLE EAR GRANULATIONS IN CHRONIC OTITIS MEDIAAND THEIR MANAGEMENT

2021 ◽  
pp. 33-35
Author(s):  
Shambhu Sharan Gupta ◽  
Satish Kumar ◽  
Debarshi Jana
Keyword(s):  
Middle Ear ◽  
Laboratory Data ◽  
Topical Steroid ◽  
Chronic Otitis Media ◽  
Urban Background ◽  
Male Preponderance ◽  
History Of ◽  
Chemical Cautery ◽  
Rural Patients ◽  
Complete History

Objective: The purpose of this study was to evaluate the etiopathogenesis of middle ear granulations in cases of Chronic Otitis Media (COM) and their management. Materials and Methods:Aprospective study was conducted on 100 patients over a period of 12 months. Patients clinically diagnosed as COM and operated, with the ndings of granulations in middle ear were included in this study. Each of these patients was subjected to complete history and thorough ENT examination after taking proper written informed consent. Clinical and laboratory data from the study was recorded as per the proforma. Results:Analysis of data revealed that maximum cases were found in the second or third decade of life with a male preponderance. Rural patients were 75% as compared to those from urban background 25%. Mucosal type of COM was found in 69% patients and squamous type in 31% patients. Maximum patients presented with history of discharge since 5-10 years, mostly mucopurulent type of discharge. Granulations were found to be present at more that one site in middle ear in most of the patients. Incus was the most commonly involved ossicle. Conservative management included chemical cautery and aural toilet followed with antibiotics with topical steroid.

The Editions of Milton's History of Britain

PMLA ◽  
1920 ◽  
Vol 35 (1) ◽  
pp. 116-122
Author(s):  
Harry Glicksman
Keyword(s):  
The Other ◽  
Norman Conquest ◽  
History Of ◽  
Historical Writings ◽  
Complete History

Separate editions of Milton's History of Britain appeared in 1670, 1677, 1695, and 1818. It has been included in all the important collections of his prose works. In 1706, moreover, Dr. White Kennett, whose Complete History of England is a series of historical writings from the pens of various authors, chose Milton's work to do duty for the period preceding the Norman Conquest. Foot-notes were added, though of no remarkable value. The first of Kennett's three folio volumes was republished in 1719; in 1870 Milton's history, and along with it two of the other contributions to the first volume, were reprinted under one octavo cover; in 1878 appeared a stereotype reproduction of the volume of 1870.

scholarly journals EXPLORING FRAMEWORKS FOR A HISTORY OF EARTH BUILDING IN AOTEAROA NEW ZEALAND

2020 ◽  
Vol XLIV-M-1-2020 ◽  
pp. 969-976
Author(s):  
M. Hall
Keyword(s):  
New Zealand ◽  
Standard Form ◽  
First Century ◽  
World War Two ◽  
World War ◽  
Structural Hierarchy ◽  
Aotearoa New Zealand ◽  
History Of ◽  
Detailed Record ◽  
Complete History

Abstract. Aotearoa New Zealand has a unique earth building heritage. For centuries, Māori used earth for floors and as a binder for fibrous walling materials. When settlers arrived in the nineteenth century, they brought earth building techniques with them, and in the early days of colonisation, earth buildings were commonplace. Many still survive, but as processed timber became readily available, building in earth declined; by the middle of the twentieth century it had almost ceased. Following renewed interest after World War Two, earth building continued into the twenty-first century, albeit as a non-standard form of construction. Databases compiled by Heritage New Zealand, Miles Allen, and the author, supplemented by accounts from a variety of sources, provide a relatively detailed record of earth buildings from all over Aotearoa but no cohesive history has yet been written. This paper considers possible approaches to writing such a history. Methodologies employed in local and international architectural histories are analysed, and a number of structural hierarchies are identified: for instance, Ronald Rael organises his material firstly by technique and then chronology in Earth Architecture, while Ted Howard uses location and then chronology for his Australasian history, Mud and Man. Information from New Zealand sources is then applied to these frameworks to arrive at an appropriate structural hierarchy for a complete history of earth building in Aotearoa.

Sign in / Sign up

Export Citation Format

Share Document