Non-destructive techniques are used widely in the metal industry in order to control the quality of materials. Eddy current testing is one of the most extensively used non-destructive techniques for inspecting electrically conductive materials at very high speeds that does not require any contact between the test piece and the sensor. This paper includes an overview of the fundamentals and main variables of eddy current testing. It also describes the state-of-the-art sensors and modern techniques such as multi-frequency and pulsed systems. Recent advances in complex models towards solving crack-sensor interaction, developments in instrumentation due to advances in electronic devices, and the evolution of data processing suggest that eddy current testing systems will be increasingly used in the future.

/pdf/non-destructive-techniques-based-on-eddy-current-testing-ekomtngkyg.pdf

Non-Destructive Techniques Based on Eddy Current Testing

We present an interactive system that lets a user move and deform a two-dimensional shape without manually establishing a skeleton or freeform deformation (FFD) domain beforehand. The shape is represented by a triangle mesh and the user moves several vertices of the mesh as constrained handles. The system then computes the positions of the remaining free vertices by minimizing the distortion of each triangle. While physically based simulation or iterative refinement can also be used for this purpose, they tend to be slow. We present a two-step closed-form algorithm that achieves real-time interaction. The first step finds an appropriate rotation for each triangle and the second step adjusts its scale. The key idea is to use quadratic error metrics so that each minimization problem becomes a system of linear equations. After solving the simultaneous equations at the beginning of interaction, we can quickly find the positions of free vertices during interactive manipulation. Our approach successfully conveys a sense of rigidity of the shape, which is difficult in space-warp approaches. With a multiple-point input device, even beginners can easily move, rotate, and deform shapes at will.

/pdf/as-rigid-as-possible-shape-manipulation-4ir0osawg2.pdf

As-rigid-as-possible shape manipulation

Towards an integrated generative design framework

Man-made objects are largely dominated by a few typical features that carry special characteristics and engineered meanings. State-of-the-art deformation tools fall short at preserving such characteristic features and global structure. We introduce iWIRES, a novel approach based on the argument that man-made models can be distilled using a few special 1D wires and their mutual relations. We hypothesize that maintaining the properties of such a small number of wires allows preserving the defining characteristics of the entire object. We introduce an analyze-and-edit approach, where prior to editing, we perform a light-weight analysis of the input shape to extract a descriptive set of wires. Analyzing the individual and mutual properties of the wires, and augmenting them with geometric attributes makes them intelligent and ready to be manipulated. Editing the object by modifying the intelligent wires leads to a powerful editing framework that retains the original design intent and object characteristics. We show numerous results of manipulation of man-made shapes using our editing technique.

https://graphics.stanford.edu/~niloy/research/iwires/paper_docs/iWires_paper_small.pdf

iWIRES: an analyze-and-edit approach to shape manipulation

We introduce an interactive technique for manipulating simple 3D shapes based on extracting them from a single photograph. Such extraction requires understanding of the components of the shape, their projections, and relations. These simple cognitive tasks for humans are particularly difficult for automatic algorithms. Thus, our approach combines the cognitive abilities of humans with the computational accuracy of the machine to solve this problem. Our technique provides the user the means to quickly create editable 3D parts---human assistance implicitly segments a complex object into its components, and positions them in space. In our interface, three strokes are used to generate a 3D component that snaps to the shape's outline in the photograph, where each stroke defines one dimension of the component. The computer reshapes the component to fit the image of the object in the photograph as well as to satisfy various inferred geometric constraints imposed by its global 3D structure. We show that with this intelligent interactive modeling tool, the daunting task of object extraction is made simple. Once the 3D object has been extracted, it can be quickly edited and placed back into photos or 3D scenes, permitting object-driven photo editing tasks which are impossible to perform in image-space. We show several examples and present a user study illustrating the usefulness of our technique.

3-Sweep: extracting editable objects from a single photo

Swirling-sweepers is a new method for modeling shapes while preserving volume. The artist describes a deformation by dragging a point along a path. The method is independent of the geometric representation of the shape. It preserves volume and avoids self-intersections, both local and global. It is capable of unlimited stretching and the deformation can be constrained to affect only apart of the model. We argue that all of these properties are necessary for interactive modeling if the user is to have the impression that he or she is shaping a real material. Our method is the first to implement all five.

/pdf/swirling-sweepers-constant-volume-modeling-4d2det155b.pdf

Swirling-sweepers: constant-volume modeling

http://manuscript.elsevier.com/S0141118722000748/pdf/S0141118722000748.pdf

Autonomous Surface Vehicle energy-efficient and reward-based path planning using Particle Swarm Optimization and Visibility Graphs

Seagrasses are critical components of marine food webs, yet negatively impacted by excessive coverage of epiphyte (attached algae or plants) or epifauna (organisms or animals). Since excessive nutrients result in excessive epiphyte/epifauna growth, epiphyte/epifauna coverage on seagrasses may serve as an indicator of nutrient status of local marine systems. In this work, the hyperspectral images obtained from seagrass samples are investigated to quantify percent epifauna coverage. The N-FINDR algorithm is utilized for spectral analysis to identify endmembers. Each test spectrum is then correlated with endmembers for classification. The classification results (epifauna or not epifauna) are mapped on a 2D binary image. In spatial analysis, a single image frame from a series of hyperspectral image frames is selected and analyzed using a 2D image processing chain. We show that independent spectral and spatial analysis results produce comparable results.

Investigation of epifauna coverage on seagrass blades using spatial and spectral analysis of hyperspectral images

Creating animated speech requires a facial model capable of representing the myriad shapes the human face experiences during speech and a method to produce the correct shape at the correct time. We present a facial model designed to support animated speech. Our model has a highly deformable lip model that is grafted onto the input facial geometry providing the necessary geometric complexity for creating lip shapes and high-quality lip renderings. We provide a highly deformable tongue model that can represent the shapes the tongue experiences during speech. We add teeth, gums, and upper palate geometry to complete the inner mouth. For more realistic movement of the skin we consider the underlying soft and hard tissue. To decrease the processing time we hierarchically deform the facial surface. 
We also present a method to animate the facial model over time to create animated speech. We use a track-based animation system that has one facial model parameter per track with possibly more than one track per parameter. The tracks contain control points for a curve that describes the value of the parameter over time. We allow many different types and orders of curves that can be combined in different manners. For more realistic speech we develop a coarticulation model that defines visemes as curves instead of a single position. This treats a viseme as a dynamic shaping of the vocal tract and not as a static shape.

A facial model and animation techniques for animated speech

This paper describes a method using L-systems that models tree growth based on the interaction of the tree's internal attributes with themselves and with environmental conditions. Modeled components include chemical flow and water distribution within the tree, phototropism, space tropism, energy generation and usage, weight support, and self-pruning.Our system is described and many results are presented which show how the individual factors affect tree growth, and also how they interact with each other.

Simulating tree growth based on internal and environmental factors

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Scott A. King

Author Tools

Chat about Author