The effective management of construction drawings is an important provision in the design and construction process, particularly where they amount to many hundreds or thousands. Whilst nowadays the majority of drawings are CAD based and therefore compatible for computer based management systems, there is still little evidence of this being employed. This fact is surprising in view of the substa...

A semi-fragile watermarking algorithm for authenticating 2D engineering graphics based on log-polar coordinates mapping is proposed. Firstly, the coordinates of vertices of entities are mapped to the log-polar coordinate system to obtain the invariance of translation, scaling and rotation. Then the watermark is embedded in the mantissa of the real-valued log-polar coordinates via bit substituti...

In recent years there has been considerable interest in developing instructional techniques that enhance the visual perception skills of students taking engineering graphics courses. One of the techniques often mentioned is animation: the dynamic display of visual information. This paper examines computer-based dynamic display techniques that assist in the perception of three dimensional form. ...

In the paper, the necessity of root stubble harvesting and recycling was put forward from the perspective of biomass energy utilization. To accomplish mechanized harvesting on root stubble, a rotary digging machine was designed based on parametric modeling software Solidworks. Firstly, parts were built under entity modeling module, and then assembled to 4 main mechanisms in assembling environme...

Autonomous learning plays an important role in raising students’ learning effect and innovation ability in university education. An effective e-learning environment is indispensable in autonomous learning. This paper studies a web based e-learning system and examines students’ autonomous learning ability and perceptions of e-learning taking students at University of Jinan in China as an example...

Social engineering is the acquisition of information about computer systems by methods that deeply include non-technical means. While technical security of most critical systems is high, the systems remain vulnerable to attacks from social engineers. Social engineering is a technique that: (i) does not require any (advanced) technical tools, (ii) can be used by anyone, (iii) is cheap. While som...

Many recent approaches to the problem of interpreting line drawings as solid objects treat inflation as a two-stage approach, the first stage being to produce a quick initial estimate of vertex zcoordinates, and the second being to refine these initial estimates to produce a “more beautiful” geometry. By making assumptions about engineering objects and the ways people see and depict them, it is...

1 Jeffrey R. Mountain, The University of Texas at Tyler, Department of Mechanical Engineering, Tyler, Tx. 75799, [email protected] 2 Michael H. Pleck, The University of Illinois at Urbana-Champaign, Department of General Engineering, Urbana, IL 61801, [email protected] Abstract – Educational outcomes assessment is becoming an important focus of education, particularly under ABET ...

Closed or nearly closed regions are an important form of perceptual structure arising both in natural imagery and in many forms of human-created imagery including sketches, line art, graphics, and formal drawings. This paper presents an effective algorithm especially suited for finding perceptually salient, compact closed region structure in hand-drawn sketches and line art. We start with a gra...

This paper presents new aspects of Anton Tedesko’s design for an important thin shell concrete roof. The study of this roof results from the examination of original engineering drawings and calculations which we present with the goal of promoting a greater understanding of the structural design of a major figure in the tradition of 20th century building. CE Database subject headings: Thin shell...