scholarly journals The implementation and advancement of a regional geodetic vertical datum

2021 ◽  
Vol 880 (1) ◽  
pp. 012012
Author(s):  
N M Yazid ◽  
A H M Din ◽  
A H Omar ◽  
M F Pa’suya ◽  
N M Abdullah
Keyword(s):  
Three Dimensional ◽  
Data Gathering ◽  
The United States ◽  
Geoid Height ◽  
Essential Elements ◽  
Reference Surface ◽  
Astronomical Tide ◽  
Vertical Datum ◽  
Marine Areas ◽  
Three Dimensional Coordinate

Abstract The essential parameter in computing three-dimensional coordinate system is the height or depth of the Earth’s surface. It represents a particular reference surface that recognised as a vertical datum. The vertical datum is alienated into two foremost categories recognised as Mean Sea Level and Lowest Astronomical Tide. Different modifications approach, techniques and software programs are developed to determine vertical datum of a region with respect to geoid surface. This paper presents an effort to review and discuss the implementations and advancement of geodetic vertical datum based on geoid height reference surface. Hence, there are eight countries will be extracted and outlined in this paper consist of the United States of America, Australia, Taiwan, New Zealand, South Korea, Thailand, Philippines and Malaysia. An overview of geodetic vertical datum which implemented in these countries are summarised to support the future development of a regional vertical datum model. Then, the overview will also be utilised and analysed based on the essential elements and parameters for vertical datum model determination which include: data gathering, data input and analysis approach in order to develop a geodetic vertical datum model with good accuracy. These attempt and initiative are vital for the current and future implementation and advancement of geodetic vertical datum in the region of Malaysia across land and marine areas.

scholarly journals THE ASSESSMENT OF GEODETIC VERTICAL DATUM APPLICATION IN AMERICAN, AUSTRALIA, TAIWAN, NEW ZEALAND, SOUTH KOREA, AND PENINSULAR MALAYSIA

2021 ◽  
Vol 6 (24) ◽  
pp. 186-199
Author(s):  
Nornajihah Mohammad Yazid ◽  
Ami Hassan Md Din ◽  
Abdullah Hisam Omar ◽  
Nazirah Mohamad Abdullah ◽  
Muhammad Faiz Pa’suya
Keyword(s):  
New Zealand ◽  
South Korea ◽  
Three Dimensional ◽  
Data Gathering ◽  
Peninsular Malaysia ◽  
Future Application ◽  
Astronomical Tide ◽  
Vertical Datum ◽  
Three Dimensional Coordinate ◽  
Gathering Data

Height or depth on the surface of the Earth is the crucial element in the three-dimensional coordinate system. Commonly, the height or depth value will denote a particular reference surface known as a vertical datum. Conventionally, the vertical datum is divided into two major categories which are Geoid/ Mean Sea Level and Lowest Astronomical Tide. This paper is an effort to review the applications of geodetic vertical datum from American, Australia, Taiwan, New Zealand, South Korea, and Peninsular Malaysia. An overview of geodetic vertical datum will be summarised to support the future application. Thus, a review consisting of a data gathering, data input, and analysis approach in vertical datum applications will be discussed and outlined. This initiative is significant for the planning and advancement of future vertical datum development in Malaysia.

scholarly journals Heritage Artefacts in the COVID-19 Era: The Aura and Authenticity of 3D Models

2021 ◽  
Vol 7 (1) ◽  
pp. 519-539
Author(s):  
Thiago Minete Cardozo ◽  
Costas Papadopoulos
Keyword(s):  
User Experience ◽  
Three Dimensional ◽  
3D Models ◽  
Essential Elements ◽  
The Other ◽  
Social Distancing ◽  
The Public ◽  
Affective Experiences ◽  
The One ◽  
Digital Engagement

Abstract Museums have been increasingly investing in their digital presence. This became more pressing during the COVID-19 pandemic since heritage institutions had, on the one hand, to temporarily close their doors to visitors while, on the other, find ways to communicate their collections to the public. Virtual tours, revamped websites, and 3D models of cultural artefacts were only a few of the means that museums devised to create alternative ways of digital engagement and counteract the physical and social distancing measures. Although 3D models and collections provide novel ways to interact, visualise, and comprehend the materiality and sensoriality of physical objects, their mediation in digital forms misses essential elements that contribute to (virtual) visitor/user experience. This article explores three-dimensional digitisations of museum artefacts, particularly problematising their aura and authenticity in comparison to their physical counterparts. Building on several studies that have problematised these two concepts, this article establishes an exploratory framework aimed at evaluating the experience of aura and authenticity in 3D digitisations. This exploration allowed us to conclude that even though some aspects of aura and authenticity are intrinsically related to the physicality and materiality of the original, 3D models can still manifest aura and authenticity, as long as a series of parameters, including multimodal contextualisation, interactivity, and affective experiences are facilitated.

A Study on Proposal of Environmental Assessment Method in Materials and Resource Category of Korea Green Building Certification

2014 ◽  
Vol 1025-1026 ◽  
pp. 1160-1163 ◽  
Author(s):  
Yu Ri Gong ◽  
Sung Ho Tae ◽  
Seung Jun Roh
Keyword(s):  
Building Materials ◽  
Green Building ◽  
The United States ◽  
Assessment Method ◽  
Essential Elements ◽  
Assessment Process ◽  
Environment Friendly ◽  
The United Kingdom ◽  
Environment Assessment ◽  
Assessment Guidelines

The purpose of this study is to propose a method of environment assessment in the field of building materials within Korea Green Building Certification (G-SEED). The method of environment assessment in the field of building materials was examined using LEED of the United States and BREEAM of the United Kingdom, the representative environment-friendly building certification systems in other countries. Especially, each revision of BREEAM was investigated for assessment methods such as environment assessment guidelines and assessment programs. In addition, assessment process and items were analyzed in relation to BREEAM. As a result, for environment assessment in the field of building materials within G-SEED, the method of connecting essential elements such as building material assessment guidelines and database networks with G-SEED was proposed.

The 1972 Elections

1973 ◽  
Vol 7 (1) ◽  
pp. 1-15
Author(s):  
H. G. Nicholas
Keyword(s):  
Political Parties ◽  
Data Gathering ◽  
The United States ◽  
United States Constitution ◽  
The Public ◽  
Pressure Groups ◽  
Wide Range ◽  
Political Forces ◽  
American Elections ◽  
To Come

Elections satisfy both the practical and the theoretical requirements of classical democratic theory if they answer one question only: Who shall rule? Judged by this test the American elections of 7 November 1972 returned as clear and unequivocal an answer as the United States Constitution permits – crystal-clear as to individuals, equivocal as to parties and political forces. But the student of politics and society cannot resist treating elections as data-gathering devices on a wide range of other questions, on the state of the public mind, on the relative potency of pressure groups, on the internal health of the political parties, and, of course, on the shape of things to come. In this ancillary role American elections, despite the generous wealth of statistical material which they throw up – so much more detailed and categorized (though often less precise) than our own – Suffer in most years from one severe limitation, a limitation which in 1972 was particularly conspicuous; they do not engage the interest of more than a moderate percentage of the American citizenry. In 1972 that percentage was as low as 55 per cent, i.e. out of an estimated eligible population of 139,642,000 only 77,000,000 went to the polls. Since this circumscribes the conclusions which can be drawn from the results themselves, as well as constituting a phenomenon of considerable intrinsic interest, it seems worthwhile to begin any examination of the 1972 elections by an analysis not of the votes counted but of those which were never cast.

A Finite Element Model of the Human Knee Joint for the Study of Tibio-Femoral Contact

2002 ◽  
Vol 124 (3) ◽  
pp. 273-280 ◽  
Author(s):  
Tammy L. Haut Donahue ◽  
M. L. Hull ◽  
Mark M. Rashid ◽  
Christopher R. Jacobs
Keyword(s):  
Finite Element ◽  
Articular Cartilage ◽  
Three Dimensional ◽  
Element Model ◽  
Maximum Pressure ◽  
Contact Behavior ◽  
Element Size ◽  
Solid Models ◽  
Flexion Extension ◽  
Three Dimensional Coordinate

As a step towards developing a finite element model of the knee that can be used to study how the variables associated with a meniscal replacement affect tibio-femoral contact, the goals of this study were 1) to develop a geometrically accurate three-dimensional solid model of the knee joint with special attention given to the menisci and articular cartilage, 2) to determine to what extent bony deformations affect contact behavior, and 3) to determine whether constraining rotations other than flexion/extension affects the contact behavior of the joint during compressive loading. The model included both the cortical and trabecular bone of the femur and tibia, articular cartilage of the femoral condyles and tibial plateau, both the medial and lateral menisci with their horn attachments, the transverse ligament, the anterior cruciate ligament, and the medial collateral ligament. The solid models for the menisci and articular cartilage were created from surface scans provided by a noncontacting, laser-based, three-dimensional coordinate digitizing system with an root mean squared error (RMSE) of less than 8 microns. Solid models of both the tibia and femur were created from CT images, except for the most proximal surface of the tibia and most distal surface of the femur which were created with the three-dimensional coordinate digitizing system. The constitutive relation of the menisci treated the tissue as transversely isotropic and linearly elastic. Under the application of an 800 N compressive load at 0 degrees of flexion, six contact variables in each compartment (i.e., medial and lateral) were computed including maximum pressure, mean pressure, contact area, total contact force, and coordinates of the center of pressure. Convergence of the finite element solution was studied using three mesh sizes ranging from an average element size of 5 mm by 5 mm to 1 mm by 1 mm. The solution was considered converged for an average element size of 2 mm by 2 mm. Using this mesh size, finite element solutions for rigid versus deformable bones indicated that none of the contact variables changed by more than 2% when the femur and tibia were treated as rigid. However, differences in contact variables as large as 19% occurred when rotations other than flexion/extension were constrained. The largest difference was in the maximum pressure. Among the principal conclusions of the study are that accurate finite element solutions of tibio-femoral contact behavior can be obtained by treating the bones as rigid. However, unrealistic constraints on rotations other than flexion/extension can result in relatively large errors in contact variables.

scholarly journals Numerical Network Modeling of Heat and Moisture Transfer through Capillary-Porous Building Materials

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1819
Author(s):  
Borys Basok ◽  
Borys Davydenko ◽  
Anatoliy M. Pavlenko
Keyword(s):  
Building Materials ◽  
Moisture Transfer ◽  
Three Dimensional ◽  
Total Pore Volume ◽  
Equivalent Diameter ◽  
Average Pore ◽  
The Difference ◽  
Three Dimensional Coordinate ◽  
Solid Liquid ◽  
Heat And Moisture

The article presents the modeling of the dynamics of the vapor-gas mixture and heat and mass transfer (sorption-desorption) in the capillary structure of the porous medium. This approach is underpinned by the fact that the porous structure is represented by a system of linear microchannels oriented along the axes of a three-dimensional coordinate system. The equivalent diameter of these channels corresponds to the average pore diameter, and the ratio of the total pore volume to the volume of the entire porous material corresponds to its porosity. The entire channel area is modeled by a set of cubic elements with a certain humidity, moisture content, pressure and temperature. A simulation is carried out taking into account the difference in temperatures of each of the phases: solid, liquid and gas.

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