Prioritizing Design for Environment Strategies Using a Stochastic Analytic Hierarchy Process

Prioritizing Design for Environment Strategies Using a Stochastic Analytic Hierarchy Process

Devarajan Ramanujan, William Z. Bernstein, Mikko Koho, Fu Zhao, Karthik Ramani
Journal of Mechanical Design, 136(7), 071002

This paper describes a framework for applying design for environment (DfE) within an industry setting. Our aim is to couple implicit design knowledge such as redesign/process constraints with quantitative measures of environmental performance to...

KINETOGAMI, A Reconfigurable and Printable Sheet Folding

KINETOGAMI, A Reconfigurable and Printable Sheet Folding

Wei Gao, Karthik Ramani, Raymond J. Cipra and Thomas Siegmund
ASME Journal of Mechanical Design, 135(11), doi: 10.1115/1.4025506, 2013

Abstract: As an ancient paper craft originating from Japan, origami has been naturally embedded and contextualized in a variety of applications in the fields of mathematics, engineering, food packaging, and biological design. The computational and...

Contextualizing Environmental Sustainability in Design Engineering Curricula

Contextualizing Environmental Sustainability in Design Engineering Curricula

Devarajan Ramanujan, William Z. Bernstein, Monica Cardella, Karthik Ramani
In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference (pp. V003T04A025-V003T04A025). American Society of Mechanical Engineers.

Consideration of environmental sustainability is significantly altering the nature of the mechanical design process. This necessitates integration of sustainability related learning content in design engineering curricula. Although various...

PROTO-TAI: Quick Design Prototyping using Tangible Assisted Interfaces

PROTO-TAI: Quick Design Prototyping using Tangible Assisted Interfaces

Cecil Piya, Karthik Ramani
Proceedings of the ASME 2014 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2014, August 16-20, 2014, Buffalo, NY, USA

In the real world, we use our innate manual dexterity to create and manipulate 3D objects. Conventional virtual design tools largely neglect this skill by imposing non-intuitive 2D control mechanisms for interacting with 3D design models. Their...

Collaborative Sketching with skWiki: A Case Study

Collaborative Sketching with skWiki: A Case Study

Senthil Chandrasegaran, Sriram Karthik Badam, Zhenpeng Zhao, Niklas Elmqvist, Lorraine Kisselburgh, Karthik Ramani
Proceedings of the ASME IDETC/CIE Conference, Aug 17-20,Buffalo, NY, 2014.

Sketching for conceptual design has traditionally been performed on paper. Recent computational tools for conceptual design have leveraged the availability of hand-held computing devices and web-based collaborative platforms. Further, digital...

ViSER: Visualizing supply chains for eco-conscious redesign

ViSER: Visualizing supply chains for eco-conscious redesign

William Z. Bernstein, Devarajan Ramanujan, Niklas Elmqvist, Fu Zhao, Karthik Ramani
ASME Paper No. DETC2014-34960.

In this paper, we present ViSER, an interactive visual analytics platform that visualizes supply chain data for enabling eco-conscious redesign. ViSER provides a visualization dashboard consisting of multiple mutually coordinated views that provide...

HexaMorph: A Reconfigurable and Foldable Hexapod Robot Inspired by Origami

HexaMorph: A Reconfigurable and Foldable Hexapod Robot Inspired by Origami

Wei Gao, Ke Huo, Jasjeet S. Seehra, Karthik Ramani, and Raymond J. Cipra
IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS'14) , Chicago, September, 2014

Origami affords the creation of diverse 3D objects through explicit folding processes from 2D sheets of material. Originally as a paper craft from 17th century AD, origami designs reveal the rudimentary characteristics of sheet folding: it is...

ChiroBot: Modular-Robotic Manipulation via Spatial Hand Gestures.

ChiroBot: Modular-Robotic Manipulation via Spatial Hand Gestures.

Jasjeet Singh Seehra, Ansh Verma and Karthik Ramani
Proceedings of the 2014 conference on Interaction design and children (IDC '14). ACM, New York, NY, USA, 209-212.

We introduce ChiroBot, a cyber-physical construction kit that allows users to create custom robots out of craft material, easily assemble the robots using joint modules and control them using hand gestures. These hand-crafted robots are assembled...

IDEA-Pen: Interactive Design and Analysis through a Pen-based Interface

IDEA-Pen: Interactive Design and Analysis through a Pen-based Interface

Anirudh Roshan Sriram, Monica E Cardella, Karthik Ramani
121st ASEE Annual Conference & Exposition, Indianapolis, IN, June 15-18, 2014

For students to succeed in engineering design (and engineering practice) they must be able to make design decisions that are grounded in data and analysis. The potential danger, however, in introducing analysis and calculations too early in the...

PuppetX: A Framework for Gestural Interactions With User Constructed Playthings

PuppetX: A Framework for Gestural Interactions With User Constructed Playthings

Saikat Gupta, Sujin Jang, and Karthik Ramani
Proceedings of the ACM Conference on Advanced Visual Interfaces, May 27-30, Como, Italy. pp. 73-80, 2014

We present PuppetX, a framework for both constructing playthings and playing with them using spatial body and hand gestures. This framework allows users to construct various playthings similar to puppets with modular components representing basic...

Tracing and Sketching Performance using Blunt-tipped Styli on Direct-Touch Tablets

Tracing and Sketching Performance using Blunt-tipped Styli on Direct-Touch Tablets

Sriram Karthik Badam, Senthil Chandrasegaran,Niklas Elmqvist, and Karthik Ramani
Proceedings of the ACM Conference on Advanced Visual Interfaces, May 27-30, Como, Italy. pp. 193-200, 2014

Direct-touch tablets are quickly replacing traditional pen-and-paper tools in many applications, but not in case of the designer's sketchbook. In this paper, we explore the tradeoffs inherent in replacing such paper sketchbooks with digital tablets...

zPots : A Virtual Pottery Experience Through Spatial Interactions Using the Leap Motion Device

zPots : A Virtual Pottery Experience Through Spatial Interactions Using the Leap Motion Device

Vinayak, Karthik Ramani, Kevin Lee Jr., Raja Jasti
Proceedings of the ACM CHI' 14 Extended Abstracts on Human Factors in Computing System (CHI EA'14) April 26- May 1, Toronto, Canada.

We present zPots, an application for gesture-free hand-based design of virtual pottery enabled by the Leap Motion device. With zPots, a user can shape and color 3D pots by moving bare hands in the air with minimal or no training. Unlike large-space...

Chiron: Interpreting signals from Capacitive Patterns and Inertial Sensors for intuitive Shape Modeling.

Chiron: Interpreting signals from Capacitive Patterns and Inertial Sensors for intuitive Shape Modeling.

Ansh Verma, Gabriel Culberston and Karthik Ramani
In Proceedings of the extended abstracts of the 32nd annual ACM conference on Human factors in computing systems (pp. 1831-1836). ACM.

In this paper we introduce Chiron (abbr. Chironomia ): A wearable device for the hand that reads the digital and analogous signals from capacitive sensor patterns and orientation sensors, to interpret user-intent. Here, we explore two cases -- (a)...

Juxtapoze: Supporting Serendipity and Creative Expression in Clipart Compositions

Juxtapoze: Supporting Serendipity and Creative Expression in Clipart Compositions

William Benjamin, Senthil Chandrasegaran, Devarajan Ramanujan, Niklas Elmqvist, SVN Vishwanathan, Karthik Ramani
Proceedings of the ACM Conference on Human Factors in Computing Systems, April 26 - May 1, Toronto, Canada. pp 341-350, 2014.

Juxtapoze is a clipart composition workflow that supports creative expression and serendipitous discoveries in the shape domain. We achieve creative expression by supporting a workflow of searching, editing, and composing: the user queries the...

skWiki: A Multimedia Sketching System for Collaborative Creativity

skWiki: A Multimedia Sketching System for Collaborative Creativity

Zhenpeng Zhao, Sriram Karthik Badam, Senthil Chandrasegaran, Deok Gun Park, Niklas Elmqvist, Lorraine Kisselburgh, and Karthik Ramani
Proceedings of the ACM Conference on Human Factors in Computing Systems, April 26 - May 1, Toronto, Canada. pp. 1235-1244, 2014.

We present skWiki, a web application framework for collaborative creativity in digital multimedia projects, including text, hand-drawn sketches, and photographs. skWiki overcomes common drawbacks of existing wiki software by providing a rich...

shapeSift: Suggesting sustainable options in design reuse from part repositories

shapeSift: Suggesting sustainable options in design reuse from part repositories

Devarajan Ramanujan, William Benjamin, William Z. Benstein, Niklas Elmqvist, Karthik Ramani
ASME IDETC/CIE 2013

shapeSift is a framework for supporting sustainability based decision making during selection of similar previous designs from part repositories. Our framework is designed for 3D part repositories that contain metadata pertaining to materials and...

Understanding Brainstorming through Text Visualization

Understanding Brainstorming through Text Visualization

Senthil Chandrasegaran, Lorraine Kisselburgh, Karthik Ramani
ASME IDETC/CIE 2013

Automated content analysis software tools have significantly aided in the study of design processes in the recent past. However, they suffer from the lack of domain knowledge and insight that a human expert can provide. In this paper, we adopt the...

Multiscale Kernels using Random Walks

Multiscale Kernels using Random Walks

Karthik Ramani, Ayan Sinha
11th Symposium on Geometry processing, 3-5 July, Genova, Italy, 2013. Proceedings of the Computer Graphics Forum, Computer Graphics Forum, Volume 33, Issue 1, pages 164–177, 2014.

ABSTRACT We introduce novel multiscale kernels using the random walk framework and derive corresponding embeddings and pairwise distances. The fractional moments of the rate of continuous time random walk (equivalently diffusion rate) are used to...

Shape-It-Up: Hand Gesture Based Creative Expression of 3D Shapes Using Intelligent Generalized Cylinders

Shape-It-Up: Hand Gesture Based Creative Expression of 3D Shapes Using Intelligent Generalized Cylinders

Vinayak, Sundar Murugappan, HaiRong Liu, Karthik Ramani,
Computer-Aided Design, Volume 45, Issue 2, February 2013, Pages 277-287, ISSN 0010-4485, 10.1016/j.cad.2012.10.011. (http://www.sciencedirect.com/science/article/pii/S0010448512002163)

Abstract: We present a novel interaction system, “Shape-It-Up”, for creative expression of 3D shapes through the naturalistic integration of human hand gestures with a modeling scheme dubbed intelligent generalized cylinders (IGC). To...

Extended Multitouch: Recovering Touch Posture & Identity Using Depth Cameras on a Pen+Touch Tabletop Interface

Extended Multitouch: Recovering Touch Posture & Identity Using Depth Cameras on a Pen+Touch Tabletop Interface

Sundar Murugappan, Vinayak, Niklas Elmqvist, Karthik Ramani
Proceedings of ACM Conference on User Interface Software and Technology, 2012

Abstract: Multitouch surfaces are becoming prevalent, but most existing technologies are only capable of detecting the user’s actual points of contact on the surface and not the identity, posture, and handedness of the user. In this paper,...

ACTIVE-Hand: Automatic Configurable Tactile Interaction in Virtual Environment

ACTIVE-Hand: Automatic Configurable Tactile Interaction in Virtual Environment

You Wu, Lara Schmidt, Matthew Parker, John Strong, Michael Bruns, Vinayak Karthik Ramani
Proceedings of the ASME 2012 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference

Abstract: We present a novel, low-power and untethered pneumatic haptic device, namely the ACTIVE-Hand, for realistic and real-time 3D gaming experience. Currently, body-motion based 3D gaming systems primarily use visual feedback to provide partly...

The evolution, challenges, and future of knowledge representation in product design systems

The evolution, challenges, and future of knowledge representation in product design systems

Senthil Chandrasegaran, Karthik Ramani, Ram D. Sriram, Imre Horvath, Alain Bernard, Ramy Harik, Wei Gao
Computer-Aided Design Volume 45, Issue 2, February 2013, Pages 204-228.

Abstract: Product design is a highly involved, often ill-defined, complex and iterative process, and the needs and specifications of the required artifact get more refined only as the design process moves toward its goal. An eff ective computer...

Enhancing Visual Thinking in a Toy Design Course Using Freehand Sketching

Enhancing Visual Thinking in a Toy Design Course Using Freehand Sketching

Elkin Taborda, Senthil Chandrasegaran, Lorraine Kisselburgh, Tahira Reid, Karthik Ramani
Proceedings of the ASME 2012 IDETC/CIE.

Abstract: Engineering graduates in advancing economies are not only expected to have engineering knowledge, but also use them in creative and innovative ways. The  importance of visual thinking has been critical for creativity and innovation in...

Handy-Potter: Rapid 3D Shape Exploration Through Natural Hand Motions

Handy-Potter: Rapid 3D Shape Exploration Through Natural Hand Motions

Vinayak, Sundar Murugappan, Cecil Piya, Karthik Ramani
Proceedings of the ASME 2012 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2012, August 12-15, 2012, Chicago, Illinois, USA

Winner of the “All-Conference Best paper of ASME IDETC/CIE 2012” award Abstract: We present the paradigm of natural and exploratory shape modeling by introducing novel 3D interactions for creating, modifying and manipulating 3D shapes...

Kaleidogami: Multi-Primitive Reconfigurable Artistic Structures

Kaleidogami: Multi-Primitive Reconfigurable Artistic Structures

Wei Gao and Karthik Ramani
Hyperseeing Spring 2012, Special Issue on Proceedings of SMI 2012 Fabrication and Sculpting Event

Abstract: In this paper we present our initial prototypical explorations as well as the associated transformative design concept called Kaleidogami™.  This method is used for developing spatial objects that can be flattened,...

Designing-in Sustainability by Linking Engineering Curricula with K-12 Science Projects

Designing-in Sustainability by Linking Engineering Curricula with K-12 Science Projects

William Z. Bernstein, Arjun Ramani, Xiulin Ruan, Devarajan Ramanujan, and Karthik Ramani
Proceedings of the ASME 2012 IDETC/CIE.

Abstract:  In light of society's increasing awareness with regards to the health of the environment, many engineering firms are hiring recent engineering graduates with project- (or course-) based experience in environmental sustainability....

Discovering Material Recovery Scenarios for Industrial Machinery

Discovering Material Recovery Scenarios for Industrial Machinery

William Z. Bernstein, Devarajan Ramanujan, Mikko Koho, Fu Zhao, and Karthik Ramani
Proceedings of the 2012 ASME MSEC.

Abstract: Decision-making methodologies for evaluating a product’s end-of-life options have become a significant area of research. Extensive work has been carried out in the area of product recovery, e.g. module-based disassemblability,...

Teaching Design for Environment through Critique within a Project Based Product Design Course

Teaching Design for Environment through Critique within a Project Based Product Design Course

William Z. Bernstein, Devarajan Ramanujan, Fu Zhao, Monica F. Cox, and Karthik Ramani
IJEE: Special Issue on Design Centric Engineering Education, Vol. 28, No. 4, pp.1-12.

Abstract:  Future environmental regulations are creating new employment requirements within traditional engineering organizations. These organizations require recent graduates to have a strong handle on environmental issues related to new...

Center-Shift: An Approach Towards Automatic Robust Mesh Segmentation (ARMS)

Center-Shift: An Approach Towards Automatic Robust Mesh Segmentation (ARMS)

Mengtian Sun , Yi Fang , and Karthik Ramani
IEEE Computer Vision and Pattern Recognition (CVPR), 2012

Abstract: In the area of 3D shape analysis, research in mesh segmentation has always been an important topic, as it is a fundamental low-level task which can be utilized in many applications including computer-aided design, computer animation,...

ME 444: Redesigning a Toy Design Course.

ME 444: Redesigning a Toy Design Course.

Elkin Taborda, Senthil Chandrasegaran and Karthik Ramani
Proceedings of TMCE 2012, May 7–11, 2012, Karlsruhe, Germany, edited by I. Horváth and Z. Rusák, A. Albers and M. Behrendt.

Abstract: Design is a complex process which requires several tools, knowledge and procedures in order to be successful. Although technology provide designers with new and improved tools, those tools should be placed in the right stage during the...

Towards locally and globally shape-aware reverse 3D modeling

Towards locally and globally shape-aware reverse 3D modeling

Manish Goyal, Sundar Murugappan, Cecil Piya, William Benjamin, Yi Fang, Min Liu, Karthik Ramani
Computer-Aided Design, Volume 44, Issue 6, June 2012, Pages 537-553

Abstract: The process of re-creating CAD models from actual physical parts, formally known as digital shape reconstruction (DSR) is an integral part of product development, especially in re-design. While, the majority of current methods used in DSR...

Product and production systems life cycle and interaction

Product and production systems life cycle and interaction

Devarajan Ramanujan, William Z. Bernstein, Mikko Koho, Seppo Torvinen
Competitive and sustainable production systems and networks, KEKE

Introduction: This work package focuses on product life cycle and production system lifecycle. This work package describes these life cycles and then to consider the integration of product and production system life cycles. These aim at...

Computing the Inner Distances of Volumetric Models for Articulated Shape Description with a Visibility Graph

Computing the Inner Distances of Volumetric Models for Articulated Shape Description with a Visibility Graph

Yu-Shen Liu, Karthik Ramani, Min Liu
IEEE Transactions on Pattern Analysis and Machine Intelligence (PAMI), 2011, 23(12): 2538-2544.

Abstract: A new visibility graph based algorithm is presented for computing the inner distances of a 3D shape represented by a volumetric model. The inner distance is defined as the length of the shortest path between landmark points within the...

Implementing Design Critique for Teaching Sustainable Concept Generation

Implementing Design Critique for Teaching Sustainable Concept Generation

William Z. Bernstein, Devarajan Ramanujan, Monica F. Cox, Fu Zhao, John W. Sutherland, and Karthik Ramani
Proceedings of the 18th International Conference on Engineering Design (ICED11), Vol. 8, pp. 55-65.

Abstract:  Product design is one of the most important activities that can influence sustainability. Therefore, it is critical to educate students about these methodologies as they are the next generation of engineers. This paper details a study...

Virtual Repair: Geometric Reconstruction for Remanufacturing Gas Turbine Blades

Virtual Repair: Geometric Reconstruction for Remanufacturing Gas Turbine Blades

Cecil Piya, J. Michael Wilson, Sundar Murugappan, Yung Shin, and Karthik Ramani
Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Design for Manufacturing and the Life Cycle Conference IDETC/DFMLC 2011 August 29 - 31, 2011, Washington, DC, USA

Abstract: The usage of Direct Metal Deposition (DMD) technology for repairing defective voids in high-value metallic components is time consuming, since traditional geometric reconstruction methods are not seamlessly connected to the DMD process....

Towards Enabling Visual Design Exploration Involving Multiple Abstractions of Design Descriptions

Towards Enabling Visual Design Exploration Involving Multiple Abstractions of Design Descriptions

Srikanth Devanathan , Karthik Ramani
Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2011 August 28-31, 2011, Washington, DC, USA (Best Paper Award)

Abstract: Designers use several visual tools for exploring and understanding design problems and solutions. House of Quality (HoQ), function-structure, Morphological matrices, concept selection tables, 2D drawings are some of the visual tools and...

HeatWalk: Robust Salient Segmentation of Non-rigid Shapes

HeatWalk: Robust Salient Segmentation of Non-rigid Shapes

William Benjamin, Andrew Wood Polk, S. V. N. Vishwanathan, and Karthik Ramani
Computer Graphics Forum Volume 30 (2011), Number 7 Pages 2097-2106

Authors: William Benjamin , Andrew Wood Polk , S. V. N. Vishwanathan , and Karthik Ramani Published in: Computer Graphics Forum Vol: 30 (7). 2011, Pages 2097-2106 Abstract: Segmenting three dimensional objects using properties of heat diffusion on...

sLLE: Spherical Locally Linear Embedding with Applications to Tomography

sLLE: Spherical Locally Linear Embedding with Applications to Tomography

Yi Fang, S.V.N. Vishwanathan, Mengtian Sun, and Karthik Ramani
Published in IEEE Computer Vision and Pattern Recognition (CVPR), pp 1077-1129, 2011

Abstract: The tomographic reconstruction of a planar object from its projections taken at random unknown view angles is a problem that occurs often in medical imaging. Therefore, there is a need to robustly estimate the view angles given random...

Temperature Distribution Descriptor for Robust 3D Shape Retrieval

Temperature Distribution Descriptor for Robust 3D Shape Retrieval

Yi Fang, Mengtian Sun, and Karthik Ramani
4th Workshop on Non-Rigid Shape Analysis and Deformable Image Alignment (NORDIA'11). 2011 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)

Abstract: Recent developments in acquisition techniques are resulting in a very rapid growth of the number of available three dimensional (3D) models across areas as diverse as engineering, medicine and biology. It is therefore of great interest to...

APIX: Analysis from Pixellated Inputs in Early Design Using a Pen-based Interface

APIX: Analysis from Pixellated Inputs in Early Design Using a Pen-based Interface

Sundar Murugappan, Vinayak, Karthik Ramani, and Maria. C. Yang
Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2011, Washington, DC, USA

Abstract: Product development is seeing a paradigm shift in the form of a simulation-driven approach. Recently, companies and designers have started to realize that simulation has the biggest impact when used as a concept verification tool in early...

Global Geometric Affinity for Revealing High Fidelity Protein Interaction Network

Global Geometric Affinity for Revealing High Fidelity Protein Interaction Network

Yi Fang, William Benjamin, Mengtian Sun, and Karthik Ramani
PLoS ONE 6(5): e19349.

Abstract: Protein-protein interaction (PPI) network analysis presents an essential role in understanding the functional relationship among proteins in a living biological system. Despite the success of current approaches for understanding the PPI...

Heat-Mapping: A Robust Approach Toward Perceptually Consistent Mesh Segmentation

Heat-Mapping: A Robust Approach Toward Perceptually Consistent Mesh Segmentation

Yi Fang, Mengtian Sun, Minhyong Kim, and Karthik Ramani
IEEE Computer Vision and Pattern Recognition (CVPR), pp 2145-2152, 2011

Abstract: 3D mesh segmentation is a fundamental low-level task with applications in areas as diverse as computer vision, computer-aided design, bio-informatics, and 3D medical imaging. A perceptually consistent mesh segmentation (PCMS), as defined...

Evaluating Wikis as a Communicative Medium for Collaboration Within Colocated and Distributed Engineering Design Teams

Evaluating Wikis as a Communicative Medium for Collaboration Within Colocated and Distributed Engineering Design Teams

Carolynn J. Walthall , Srikanth Devanathan , Lorraine G. Kisselburgh , Karthik Ramani , E. Daniel Hirleman , and Maria C. Yang
J. Mech. Des. 133, 071001 (2011), DOI:10.1115/1.4004115

Abstract: Wikis, freely editable collections of web pages, exhibit potential for a flexible documentation and communication tool for collaborative design tasks as well as support for team design thinking early in the design process. The purpose of...

Addressing Uncertainties within Product Redesign for Sustainability: A Function Based Framework

Addressing Uncertainties within Product Redesign for Sustainability: A Function Based Framework

Devarajan Ramanujan, William Z Bernstein, Fu Zhao, Karthik Ramani
Proceedings of the ASME 2011 International Design Engineering Technical Conferences & Computers and Information in Engineering Conference IDETC/CIE 2011, August 28-31, 2011, Washington, DC, USA
The Function Impact Method (FIM) is a semi-quantitative eco-design methodology that is targeted specifically towards the early stages of the design process.
Using Diffusion Distances for Flexible Molecular Shape Comparison

Using Diffusion Distances for Flexible Molecular Shape Comparison

Yu-shen Liu, Qi Li, Guo-Qin Zheng, Karthik Ramani, and William Benjamin
BMC Bioinformatics 2010, 11:480

Abstract: Background Many molecules are flexible and undergo significant shape deformation as part of their function, and yet most existing molecular shape comparison (MSC) methods treat them as rigid bodies, which may lead to incorrect shape...