Luis Paredes Archives - Convergence Design Lab, Purdue University

FabHandWear : An End-to-End Pipeline from Design to Fabrication of Customized Functional Hand Wearables

Jun 28, 2021

Luis Paredes, Sai Swarup Reddy, Subramanian Chidambaram, Devashri Vagholkar, Yunbo Zhang, Bedrich Benes, Karthik Ramani

In Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies

Current hand wearables have limited customizability, they are loose-fit to an individual's hand and lack comfort. The main barrier in customizing hand wearables is the geometric complexity and size variation in hands. Moreover, there are different functions that the users can be looking for; some may only want to detect hand's motion or orientation; others may be interested in tracking their vital signs. Current wearables usually fit multiple functions and are designed for a universal user with none or limited customization. There are no specialized tools that facilitate the creation of...

SynchronizAR: Instant Synchronization for Spontaneous and Spatial Collaborations in Augmented Reality

Oct 15, 2018

Ke Huo, Tianyi Wang, Luis Paredes, Ana M Villanueva, Yuanzhi Cao, Karthik Ramani

In Proceedings of the 31th Annual Symposium on User Interface Software and Technology, UIST 2018, Oct. 14-17, Berlin, Germany.

We present SynchronizAR, an approach to spatially register multiple SLAM devices together without sharing maps or involving external tracking infrastructures. SynchronizAR employs a distance based indirect registration which resolves the transformations between the separate SLAM coordinate systems. We attach an Ultra-Wide Bandwidth (UWB) based distance measurements module on each of the mobile AR devices which is capable of self-localization with respect to the environment. As users move on independent paths, we collect the positions of the AR devices in their local frames and the...

MultiSoft: Soft Sensor Enabling Real-Time Multimodal Sensing with Contact Localization and Deformation Classification

Sep 30, 2018

Sang Ho Yoon, Luis Paredes, Ke Huo, Karthik Ramani

Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT Volume 2 Issue 3, UbiComp 2018)

Abstract: We introduce MultiSoft, a multilayer soft sensor capable of sensing real-time contact localization, classification of deformation types, and estimation of deformation magnitudes. We propose a multimodal sensing pipeline that carries out both inverse problem solving and machine learning tasks. Specifically, we employ an electrical impedance tomography (EIT) for contact localization and a support vector machine (SVM) for classifying deformations and regressing their magnitudes. We propose a deformation-aware system which enables maintaining a persistent single-point contact...

iSoft: A Customizable Soft Sensor with Real-time Continuous Contact and Stretching Sensing

Oct 21, 2017

Sang Ho Yoon, Ke Huo, Yunbo Zhang, Guiming Chen, Luis Paredes, Subramanian Chidambaram, Karthik Ramani

In Proceedings of the 30th Annual ACM Symposium on User Interface Software & Technology (UIST'17) , Quebec City, Canada, 2017 (Acceptance Rate: 22.5%)

We present iSoft, a single volume soft sensor capable of sensing real-time continuous contact and unidirectional stretching. We propose a low-cost and an easy way to fabricate such piezoresistive elastomer-based soft sensors for instant interactions. We employ an electrical impedance tomography (EIT) technique to estimate changes of resistance distribution on the sensor caused by fingertip contact. To compensate for the rebound elasticity of the elastomer and achieve real-time continuous contact sensing, we apply a dynamic baseline update for EIT. The baseline updates are triggered by...

CardBoardiZer: Creatively Customize, Articulate and Fold 3D Mesh Models

May 5, 2016

Yunbo Zhang,Wei Gao, Luis Paredes, Karthik Ramani

Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems (pp. 897-907). ACM.

https://youtu.be/Rnt3OCUTlZs Computer-aided design of flat patterns allows designers to prototype foldable 3D objects made of heterogeneous sheets of material. We found origami designs are often characterized by pre-synthesized patterns and automated algorithms. Furthermore, augmenting articulated features to a desired model requires time-consuming synthesis of interconnected joints. This paper presents CardBoardiZer, a rapid cardboard based prototyping platform that allows everyday sculptural 3D models to be easily customized,...