Research News

Siddharth Dawar paper titled, "A hybrid framework for mining high-utility itemsets in a sparse transaction database" co-authored by Vikram Goyal, Debajyoti Bera is accepted at the Applied Intelligence Journal.

High-utility itemset mining aims to find the set of items with utility no less than a user-defined threshold in a transaction database. High-utility itemset mining is an emerging research area in the field of data mining and has important applications in inventory management, query recommendation, systems operation research, bio-medical analysis, etc. Currently, known algorithms for this problem can be classified as either 1-phase or 2-phase algorithms. The 2-phase algorithms typically consist of tree-based algorithms which generate candidate high-utility itemsets and verify them later. A tree data structure generates candidate high-utility itemsets quickly by storing some upper bound utility estimate at each node. The 1-phase algorithms typically consist of inverted-list based and transaction projection based algorithms which avoid the generation of candidate high-utility itemsets. The inverted list and transaction projection allows computation of exact utility estimates. We propose a novel hybrid framework that combines a tree-based and an inverted-list based algorithm to efficiently mine high-utility itemsets. Algorithms based on the framework can harness benefits of both types of algorithms. We report experiment results on real and synthetic datasets to demonstrate the effectiveness of our framework.

Wazir Singh, paper titled,"Energy Efficient Biopotential Acquisition Unit for Wearable Health Monitoring Applications" co-authored by Yatharth Gupta, Paritosh Jivani and Sujay Deb was presented at ISQED-2017.

This paper presents a biopotential acquisition unit with an instrumentation amplifier and analog-to-information converter for wearable health monitoring applications. The instrumentation amplifier defines the quality of the acquired biopotential signals. At the heart of the system is an Analog to Information Converter (AIC) to enables the random under-sampling operation. AIC is used to digitize the output of the biopotential instrumentation amplifier. The proposed design is implemented in 65nm CMOS technology and shows the better results compared to the state-of-the-art technologies.​

IEEE International Conference on Identity, Security and Behavior Analysis 2017

IIIT-Delhi is hosting the "IEEE International Conference on Identity, Security and Behavior Analysis (ISBA 2017)​" to be held from February 22nd - 24th 2017​. This is a unique conference series initiated by the IEEE Biometrics Council and its third edition will be held in New Delhi, India. It is a forum that brings together experts in biometrics, security, and human behavior to consider research issues and solutions that are robust, comprehensive, and broader than currently considered in each of these individual research areas. This conference serves to provide a new forum for such broad areas defining human side of security and user behavior as well as social influence in the biometrics security. T​o register and know more : http://ieee-biometrics.org/isba2017/index.html

IEEE Winter School on Machine Learning in Biometrics

​IIIT-D is organizing the "IEEE Winter School on Machine Learning in Biometrics" from 19th-22nd February, 2017; Co-located with "IEEE International Conference on Identity, Security and Behavior Analysis 2017". ​In Winter School, ​t​here will be two tracks– the machine learning track and the biometrics track. In the machine learning track, time-tested and state-of-the-art successful machine learning tools will be discussed in detail while in the biometrics track the intricacies of major existing and upcoming biometrics modalities will be explained. Last date to register: 10th February, 2017​ . ​To know More: http://iab-rubric.org/mlib2017

Ganesh Bagler, (Faculty, IIITD), Vandana Ravindran, Sunitha V. (Faculty, Dhirubhai Ambani Institute of Information & Communication Technology), paper titled "Identification of critical regulatory genes in cancer signaling network using controllability analysis", has been published at Physica A (Impact Factor: 1.785) . Link for the paper http://www.sciencedirect.com/science/article/pii/S0378437117300699

 

Rahul Gupta (M.Tech IIIT-D), Ajay P. Yadav (Keysight Technologies), and Mohammad S. Hashmi (Faculty, IIIT-Delhi), paper titled "Symmetric Tri-band Balun Architecture with a Systematic Design Procedure", has been published at NCC 2017, Chennai, India

 

Smrutilekha Samanta, Bhawna Tiwari, Pydi Ganga Bahubalindruni, Pedro Barquinha and Joao Goes paper titled "Threshold Voltage Extraction Techniques Adaptable from Sub-micron CMOS to Large-area Oxide-TFT Technologies” got accepted for International Journal of Circuit Theory & Applications.

 

Shreya Singh, Pydi Ganga Bahubalindruni and Joao Goes, paper titled “A Robust Fully-Dynamic Residue Amplifier for Two-Stage SAR Assisted Pipeline ADCs” got accepted for ISCAS 2017.

 

Shikha Singh (PhD student) and Dr Angshul Majumdar(Faculty, IIIT-D) paper titled "Deep Sparse Coding for Non Intrusive Load Monitoring", has been accepted for publication in IEEE Transactions on Smart Grid.

 

Sri Harsha Gade (PhD student), Akash Aggarwal (CSE BTech 3rd year), Lakshit Tyagi (CSE BTech 3rd year) and Sujay Deb (Faculty advisor - IIITD), paper titled "A Floorplanner Framework for Physical Design Space Exploration of SoCs and CMPs", has won the VLSI Design Contest 2017 (http://vlsiconference.com/technical-program/design-contest/).

 

Mr Lokender Tiwari (PhD student, IIIT-D) paper titled "Robust Estimation in Geometric Computer Vision" has received best doctoral symposium award (third position) Doctoral Symposium, in 10th Indian Conference on Computer Vision, Graphics and Image Processing held at IIT-Guwahati, 18-22 December 2016.

 

Dr. Sujay Deb (Faculty, IIIT D) and Sri Harsha Gade (PhD student, IIIT D) paper titled "HyWin: Hybrid Wireless NoC with Sandboxed Sub-networks for CPU/GPU Architectures" has been accepted for publication in IEEE Transactions on Computers.

 

Ms. Deepika Yadav (PhD Student, IIIT-D), Mr. Deepak Sood (M.Tech Student, IIIT-D) and Dr. Pushpendra Singh (Faculty, IIIT-D) paper titled, "Sanghosti: Empowering Community Health Workers through Peer Learning in Rural India" has been accepted for publishing in World Wide Web (WWW) Conference, 2017. WWW is a prestigious conference with core A* rank.

 

Two of our papers titled, "Supervised Analysis Dictionary Learning: Application in Consumer Electronics Appliance Classification" and "Noisy Deep Dictionary Learning" co - authored by Dr Angshul Majumdar and students of IIIT-D has been accepted for oral presentation at Conference On Data Sciences (CODS).

 

Ms. Monalisa Jena ( PhD. Student, IIIT-D) paper titled,"Constant Factor Approximation for the Weighted Partial Degree Bounded Edge Packing Problem" co-authored by Dr. Rajiv Raman (Faculty; IIIT-D) and Dr. Pawan Aurora (Faculty; IISER Bhopal) was presented at COCOA 2016' at Hong Kong SAR, China from 16-18, December 2016.

 

A book chapter titled "Big Data to Big Knowledge for Next Generation Medicine: A Data Science Roadmap", authored by Dr. Tavpritesh Sethi, Faculty IIIT-Delhi has been accepted for publication in the book titled Guide to Big Data Applications, Springer, New York.

 

Mr Rahul Gupta (Jr. Research Engineer) poster titled,"A new high-frequency balun with simplified impedance matching technique" was presented in APMC 2016.

 

Ms. Richa Verma ( M.Tech Student, IIIT-D), Ms. Prerna Agarwal (M.Tech Student, IIIT-D) and Dr. Vishwanth Gunturi (Faculty, IIIT-D) paper titled, "Discovering Spatial Regions of High Correlation" has been accepted to be published at SSTDM 2016, IEEE ICDM 2016 Workshop.

 

Dr Ganesh Bagler's (Faculty, IIIT-D) paper titled, "A distance constrained synaptic plasticity model of C. elegans neuronal network" has been published in Physica A: Statistical Mechanics and its Applications.

 

Dr. Ganga (Faculty, IIIT-Delhi), paper titled, " A Low-Power Analog Adder and Driver using a-IGZO TFTs " co - authored by Prof. Vıtor Grade Tavares (INESC-Tec, Porto), Prof. Rodrigo Martins (CENIMAT), Prof. Elvira Fortunato,(CENIMAT), and Prof. Pedro Barquinha (CENIMAT) has been accepted for publishing in IEEE Transactions on circuits and Systems-I.

 

Dr Ganesh Bagler (Faculty, IIIT-D), paper titled "Graph theoretical biomarkers for schizophrenic brain functional networks" and "Controllability of human cancer signaling network- Signaling as a paradigm for disease control through drug-gene interactions" have been accepted in the International Conference on Signal Processing and Communication (2016) .

 

Ms Ayushi Rastogi (PhD. student , IIIT-D), Dr Nachiappan Nagappan (Microsoft Research, Redmond), the paper titled, "On the Personality Traits of GitHub Contributors" has been accepted for publication 27th International Symposium on Software Reliability Engineering (ISSRE).

 

Five papers authored by members of the Salsa lab (Anupriya Gogna, Janki Mehta, Kavya Gupta,Vanika Singhal), headed by Dr Angshul Majumdar (faculty, IIIT-Delhi) were presented at 23rd International Conference on Neural Information processing (ICONIP 2016). The presented works focussed on improving the performance and computational cost of various applications in the domain of deep learning.

 

Mr Manoj Gulati (PhD Student, IIIT-D), Dr Shobha Sundar Ram (Faculty, IIIT-D), Dr Angshul Majumdar (Faculty, IIIT-D) and Dr Amarjeet Singh's (Faculty, IIIT-D) paper titled "Single Point Conducted EMI Sensor With Intelligent Inference for Detecting IT Appliances" has been accepted for publication in IEEE Transactions on Smart Grid. A shorter version of this work also got Best Paper Award at 3rd Non-intrusive Load Monitoring Workshop held in Canada earlier this year.

 

Dr. Akshay Kumar (Faculty IIIT-D) paper titled " Efficacy of ‘Positive Psychology Based Mindfulness CBT’ in adults with Generalized Anxiety Disorder" has been accepted for publication in International Journal of Medical and Health Sciences.

 

A. Maktoomi (PhD Graduate), A. Yadav (BTech Graduate), M. Hashmi (Faculty-IIITD), and F. Ghannouchi (University of Calgary) paper has been received the best paper award (2nd position) in the 59th edition of IEEE Midwest Symposium on Circuits and Systems.
Link: http://events.kustar.ac.ae/mwscas2016/student-paper-contest-winners-announced/

 

Mr. Nipun Batra (Ph.D. Student) and Dr. Amarjeet Singh (Faculty) paper titled "Matrix Factorisation for Scalable Energy Breakdown" has been accepted for publication in AAAI 2017. This is a joint work with faculty from University of Virginia.

 

Mr. Venkatesh Vinayakarao (Ph.D. student, IIIT-D), Anita Sarma (Faculty, Oregon State University), Rahul Purandare (Faculty, IIIT-D), Shuktika Jain (Graduated BTech student, IIIT-D) and Saumya Jain (Graduated BTech student, IIIT-D)'s paper titled," ANNE: Improving Source Code Search using Entity Retrieval Approach", has been accepted for publication in Tenth International Conference on Web Search and Data Mining (WSDM'17).

 

Mr. Naveen Gupta (Ph.D. student IIITD) and Dr. Vivek Ashok Bohara (Faculty IIITD) published a paper titled, " An Adaptive Subcarrier Sharing Scheme for OFDM based Cooperative Cognitive Radios" in the IEEE Transactions on Cognitive Communications and Networking as a transactions paper submissions, in October 2016.

 

Mr. Lokender Tiwari (Ph.D. Student, IIITD) and Dr. Saket Anand (Faculty, IIITD) presented a paper titled, "Fast Hypothesis Filtering for Multi-Structure Geometric Model Fitting" in the IEEE International Conference on Image Processing (ICIP) held at Phoenix, Arizona USA during 25-28 September 2016.

 

Arpita Gang (M.Tech, IIITD) and Dr. Pravesh Biyani (IIITD) presented a paper titled, "On discriminative framework for single channel audio source separation" at conference INTERSPEECH, held in San Francisco, CA from 8-12th September 2016.

 

Mr. Rahul Gupta, Mohd. A. Maktoomi & Dr. Mohd. S. Hashmi paper's entitled "A New High-Frequency Balun with Simplified Impedance Matching Technique" has been accepted in APMC 2016 and another paper co-authored by Mohd. H. Maktoomi and Dr. Fadhel M. Ghannouchi entitled, "A Generalized Multi-Frequency Impedance Matching Technique" in MMS 2016.

 

Arpita Gang (M.Tech, IIITD) and Dr. Pravesh Biyani (IIITD) presented a paper titled, "On discriminative framework for single channel audio source separation" at conference INTERSPEECH, held in San Francisco, CA from 8-12th September 2016.

 

Hemant Kumar Aggarwal and Dr. Angshul Majumdar presented their paper "SPARSE FILTERING BASED HYPERSPECTRAL UNMIXING" as a poster, at IEEE Workshop on Hyperspectral Image and Signal Processing, held at Los Angeles, USA from 21st Aug - 24th Aug, 2016.

 

Snigdha Tariyal, Hemant Aggarwal, and Dr. Angshul Majumdar presented their paper "Greedy Deep Dictionary Learning for Hyperspectral Image Classification" as a poster at IEEE Workshop on Hyperspectral Image and Signal Processing held at Los Angeles, USA from 21st Aug - 24th Aug, 2016.

 

Dr. Vinod Scaria, CCB Adjunct faculty, Ms. Parul Sharma (MTech Student CB) publication entitled "Landscape of warfarin and clopidogrel pharmacogenetic variants in Qatari population from whole exome datasets" has been accepted in PHARMACOGENOMICS.

 

Paper by Mr. Rohit Mehra (M.Tech Student, IIITD), Dr. Vinayak Naik (IIITD), Dr. Rahul Purandare (IIITD) & Mr. Kapish Malik (M.Tech Student, IIITD), titled "KIRKE: Re-engineering of Web Applications to Mobile Apps" got accepted in Core A ranked Conference, 13th Annual International Conference on Mobile and Ubiquitous Systems: Computing, Networking and Services (MobiQuitous 2016) Industry Track

 

Work by Hemanta Kumar Mondal (PhD student, IIIT D);Sri Harsha Gade (PhD student, IIIT D) ;Md Shamim (PhD student, RIT);Dr. Sujay Deb (Faculty, IIIT D); Dr. Amlan Ganguly (Faculty, RIT), titled "Interference-Aware Wireless Network-on-Chip Architecture using Directional Antennas" has been accepted for publication in IEEE Transactions on Multi-Scale Computing Systems

 

Mr. Hemant Kumar Aggarwal (PhD student) presented a paper titled "Robust Estimation for Subspace Based Classifiers" at World Congress on Computational Intelligence (WCCI-2016) from July 24-29, 2016 held in Vancouver, Canada. The event was co-authored by Hemant Kumar Aggarwal and Angshul Majumdar in the IJCNN 2016.

 

Dr. Ganesh Bagler's publication entitled "Differential network analysis reveals evolutionary complexity in secondary metabolism of Rauvolfia serpentina over Catharanthus roseus" accepted in the journal--'Frontiers in Plant Science' Following is the link to abstract and 'provisional article' published:
http://journal.frontiersin.org/article/10.3389/fpls.2016.01229/abstract

 

Our PhD student Rakhi Hemani presented the paper titled " Easy and Expressive LLC Contention Models", At the International Conference on High Performance Computing and Simulation ( HPCS), at Innsbruck Austria, from 18 to 22, July 2016. The paper was co-authored by Rakhi Hemani(PhD student IIITD), Subhasis Banerjee(IBM Bangalore), and Apala Guha(IIITD).

 

Visible Light communication (VLC) project with Prof. Anand Srivastava (IIITD) as Principal Investigator got selected under the collaboration between Department of Science & Technology, India and Academy of Scientific Research and Technology (ASRT), Egypt in the area of Information and Communication Technology. This project is among top 20 selected project proposals from a total of 120 proposal applications received by DST from various top institutes of India. The project was selected based on scientific merit, national priority of both the countries and scientific strengths of the project coordinators.
Under this project, researchers from IIIT-Delhi and National Institute of Laser Enhanced Sciences (NILES), Cairo University will collaboratively work for providing "High performance VLC systems". The primary objective of this project would be analysis of the VLC-OFDM system for increasing system throughput and reducing BER. Further, various modulations, multiplexing and coding schemes will be analyzed and efficient techniques for data transmission will be identified.

 

Mr. M. A. Maktoomi (PhD student - IIITD), Dr. M. S. Hashmi (IIITD), Dr. M. Akbarpour (University of Calgary), and Prof. F. M. Ghannouchi's (University of Calgary)

paper titled "On the Dual-Frequency Impedance/Admittance Characteristic of Multi-Section Commensurate Transmission-Line" got accepted in the prestigious IEEE Transactions on Circuits and Systems-II.

Ishant, PhD student from CSE Department working under the guidance of Dr. Chetan Arora presented his paper "Min Norm Point Algorithm for Higher Order MRF-MAP Inference" in CVPR2016 " as spotlight presentation".

 

Alvika Gautam's (PhD scholar at IIIT-Delhi) work titled "Vision based landing of quadcopter using guidance laws" was accepted as a poster at 9th IFAC symposium for Intelligent Autonomous Vehicles (IAV), Leipzig, Germany.

She was also awarded a research support grant of 500 euros. Only 6 students received this award for the symposium.

Mr. Haroon Rashid presented a poster entitled "Collect, Compare and Score: A Generic Data-driven Anomaly Detection Method for Buildings" in 7th International Conference Future Energy Systems (ACM e-Energy), held at Waterloo Canada from 21st - 24th June 2016.

In the presented paper, he proposed a method called Collect, Compare and Score (CCS), that can be used across buildings following different energy usage patterns. CCS is evaluated using a real-world dataset, consisting of 16 weeks of data from commercial and residential buildings. Using Area Under Curve (AUC), a performance metric, CCS results in an increase of 15% in AUC value as compared to baseline method.

Jalaj Pandey and Ojaswa Sharma authored the paper titled "Fast and Robust Construction of 3D Architectural Models from 2D Plans" which is accepted for publication in the WSCG 2016 conference.

In this work we present a simple and robust method to create 3D building models from a set of architectural plans. Such plans are created for human readability and thus pose some problem in automatic creation of a 3D model. We suggest a semi-automated approach for plan cleaning and provide an algorithm for alignment and stacking of the plans followed by generation of 3D building model. We show results of our method on floor plans that generate complex 3D models in near real-time.

Ojaswa Sharma and Nidhi Agarwal authored the paper titled "3D Surface Reconstruction from Unorganized Sparse Cross Sections" which is accepted for publication in the Graphics Interface 2016 conference.

In this paper, we propose an algorithm for closed and smooth 3D surface reconstruction from unorganized planar cross sections. We address the problem in its full generality, and show its effectiveness on sparse set of cutting planes. Our algorithm is based on the construction of a globally consistent signed distance function over the cutting planes. It uses a split-and-merge approach utilising Hermite mean-value interpolation for triangular meshes. This work improvises on recent approaches by providing a simplified construction that avoids need for post-processing to smooth the reconstructed object boundary. We provide results of reconstruction and its comparison with other algorithms.

Adaptive multi-voltage scaling in wireless NoC for high performance low power applications authored by Hemanta Kumar Mondal;Sri Harsha Gade;Raghav Kishore and Sujay Deb published in Design, Automation & Test in Europe Conference & Exhibition (DATE), 2016.

Networks-on-Chip (NoCs) have garnered significant interest as communication backbone for multicore processors used across a wide range of fields that demand higher computation capability. Wireless NoCs (WNoCs) by augmenting single hop, long range wireless links with wired interconnects; offer the most promising solution to reduce multi-hop long distance communication bottlenecks and opens up innumerable possibilities of topological innovations that are not possible otherwise. However, energy consumption in routers along with Wireless Interface (WI) components still remains considerably high. Specifically for large systems with many nodes in the network, a significant amount of energy is consumed by the communication infrastructure (routers, links, WIs). The usage of the routers and WIs are application dependent and for most cases performance requirements can be met without operating the whole communication infrastructure to its maximum limit. Dynamic reconfigurable systems that can switch between both high performance and low power modes can cater to wide range of applications. In this paper, we propose a novel design methodology for energy efficient WNoC using Adaptive Multi-voltage Scaling (AMS) that reduces dynamic power consumption, along with power gating to prevent static power dissipation in routers and WIs. We evaluate our proposed design in presence of real and synthetic traffic patterns. This approach saves up to 62.50% of static power with less than 1% area overhead. In different traffic scenarios, the proposed WNoC reduces overall packet energy dissipation up to 35% on average compared to a regular WNoC, without significant performance degradation. Design considerations for augmenting existing WNoCs with these routers and corresponding overheads are also presented.
More information can be obtained here: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=7459513&c...

Dr. Pydi Ganga Bahubalindruni co-authored the paper titled “Influence of channel length scaling on InGaZnO TFTs characteristics: current-gain cutoff frequency, intrinsic voltage-gain and on-resistance” which is accepted, IEEE/OSA Journal of display technology.

This paper presents a study concerning the role of channel length scaling on IGZO TFT technology benchmark parameters, which are fabricated at temperatures not exceeding 180oC. The parameters under investigation are unity current gain cutoff frequency, intrinsic voltage-gain and on-resistance of the bottom-gate IGZO TFTs. As the channel length varies from 160 µm to 3 µm, the measured cutoff frequency increases from 163 kHz to 111.5 MHz, which is a superior value compared to the other competing low-temperature thin-film technologies, such as organic TFTs. On the other hand, for the same transistor dimensions, the measured intrinsic voltage-gain is changing from 165 to 5.3 and the on-resistance is decreasing from 1135.6 kΩ to 26.1 kΩ. TFTs with smaller channel length (3 µm) have shown a highly negative turn-on voltage and hump in the sub-threshold region, which can be attributed to short channel effects. The results obtained here, together with their interpretation based on device physics, provide crucial information for accurate IC design, enabling an adequate selection of device dimensions to maximize the performance of different circuit building blocks assuring the multifunctionality demanded by system-on-panel concepts.
Paper can be downloaded at: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7447659

Pydi Ganga Bahubalindruni co-authored the paper titled “Novel Linear Low-Power Adder with Oxide TFTs” which accepted to be presented at ISACS 2016 Conference

Low-power circuits are very important in various applications. They are essential to increase the life time of a battery operated systems or in wearable technology. This paper presented a low-cost, very low-power linear analog adder with oxide TFTs, which was fabricated at low temperature (not exceeding 200 degrees). The fabricated circuit performance was tested under normal ambient.
A novel linear analog adder is proposed only with n-type enhancement IGZO TFTs that computes summation of four voltage signals. However, this design can be easily extended to perform summation of more number of signals, just by adding a single TFT for each additional signal in the input block. The circuit needs few number of transistors, only a single power supply irrespective of the number of voltage signals to be added, and offers good accuracy over a reasonable range of input values. The circuit was fabricated on glass substrate with the annealing temperature not exceeding 200 degrees C. The circuit performance is characterized from measurements under normal ambient at room temperature, with a power supply voltage of 12V and a load of 4 pF. The designed circuit has shown a linearity error of 2.3% (until input signal peak to peak value is 2V), a power consumption of 78 uW and a bandwidth of 115 kHz, under the worst case condition (when it is adding four signals with the same frequency). In this , it has been noticed that the second harmonic is 32 dB below the fundamental frequency component. This circuit could offer an economic alternative to the conventional approaches.

To know more: http://www.epapers.org/iscas2016/ESR/session_view.php?PHPSESSID=680i8ql918kf3tpo30bi0uqj22&session_id=33

 

Domain Specific Learning for Newborn Face Recognition Paper authored by Samarth Bharadwaj, Himanshu Bhatt, Mayank Vatsa, Richa Singh accepted for publication in IEEE Transactions on Information Forensics and Security.

Biometric recognition of newborn babies is an opportunity for the realization of several useful applications such as improved security against swapping and abduction, accurate census and effective drug delivery. In this paper, the authors have explored the possibility of using face recognition towards an affordable and friendly biometric modality for newborns. The largest publicly available database of newborns collected from various sources to study face recognition is introduced. Several existing face recognition approaches and commercial systems are also evaluated on a common benchmark test. This research proposes a learning based distance metric, an online SVM formulation of the one shot similarity, to match deep neural network based encoding features with low semantic gap.

 

Ojaswa Sharma co-authored the paper titled "Shape-aware MLS deformation for line handles" which is accepted for publication in ACM SIGGRAPH Asia Technical briefs 2015.

In this work, we propose a shape-aware extension to the Moving Least Squares (MLS) image deformation algorithm proposed by Schaefer et al. The original algorithm is not applicable to concave shapes since the weights are based on the Euclidean distance. A number of recent MLS-based deformation algorithms have proposed shape-aware extensions, but only for point handles. In contrast, we suggest a closed-form mathematical solution that applies naturally to point handles as well as line handles. In particular, our solution is based on the interior distance metric to the MLS weights for line handles so that they are shape aware and produce plausible deformations.

More details about the work are available here .

Multi-Heuristic A* paper co-authored by Sandip Aine accepted for publication in International Journal of Robotics Research

The performance of heuristic search-based planners depends heavily on the quality of the heuristic function used to focus the search. Consequently, the research in developing an efficient planner for a specific domain becomes the design of a good heuristic function. However, for many domains, it is hard to design a single heuristic function that captures all of the complexities of the problem. Furthermore, it is hard to ensure that heuristics are admissible (provide lower bounds on the cost-to-goal) and consistent, which is necessary for A* like searches to provide guarantees on completeness and bounds on sub-optimality. In this paper, we develop a novel heuristic search, called Multi-Heuristic A* (MHA*), that takes in multiple, arbitrarily inadmissible heuristic functions in addition to a single consistent heuristic, and uses all of them simultaneously to search in a way that preserves guarantees on completeness and bounds on sub-optimality. This enables the search to combine very effectively the guiding powers of different heuristic functions and simplifies dramatically the process of designing heuristic functions by a user because these functions no longer need to be admissible or consistent. We support these claims with experimental analysis on several domains ranging from inherently continuous domains such as full-body manipulation and navigation to inherently discrete domains such as the sliding tile puzzle.

More information can be obtained from here

Three papers co-authored by Vivek Bohara and his studens are accepted in IEEE PIMRC

Paper1 :  S. Sharma, A. Vashistha and V.A. Bohara, “On the Performance of Multiple Antenna Cooperative Spectrum Sharing Protocol under Nakagami-m Fading” accepted to proc. of IEEE Personal, Indoor and Mobile Radio Communications (PIMRC), Hong Kong, China, August, 2015.

Summary: In a cooperative spectrum sharing protocol, two wireless systems operate over the same frequency band albeit with different priorities. The secondary (or cognitive) system which has a lower priority, helps the higher priority primary system to achieve its target rate by acting as a relay and allocating a fraction of its power to forward the primary signal.

The secondary system in return is benefited by transmitting its own data on primary system’s spectrum. In this paper, we have analyzed the performance of multiple antenna cooperative spectrum sharing protocol under Nakagami-m Fading.

Paper2 :  V. K. Singh, S. Baghoriya and V. A. Bohara. “HELPER: A Home assisted and cost Effective Living system for People with disabilities and homebound Elderly." accepted to proc. of IEEE PIMRC, Hong Kong, China, August, 2015.

Summary: Although there has been significant research and development on automation devices for assisted living, there has always been trade-offs in terms of the cost, complexity, design and efficiency. In this paper, a state-of-the art simple and efficient yet cost effective reconfigurable assisted living system is proposed and implemented which will cater for the needs of bed-ridden patients, people with disability and senior citizens.

Paper3 :  P. Aggarwal, A. Gupta and V.A. Bohara, “A Guard Interval Assisted OFDM Symbol-Based Channel Estimation for Rapid Time-Varying Scenarios in IEEE 802.11p” accepted to proc. of IEEE PIMRC, Hong Kong, China,August, 2015.

Summary: IEEE 802.11p standard is a wireless vehicular communication standard meant for outdoor applications. This standard suffers from the challenge of robust channel estimation due to rapid time-varying nature of the channel. In this paper we proposed a novel scheme of channel estimation by utilizing the guard interval of every orthogonal frequency division multiplexing (OFDM) symbol. Simulation results show considerably improved bit error rate (BER) performance compared to the existing techniques.

Group Sparse Representation Based Classification for Multi-feature Multimodal Biometrics

Gaurav Goswami, Paritosh Mittal, Angshul Majumdar, Mayank Vatsa, and Richa Singh co-authored the paper titled "Group Sparse Representation Based Classification for Multi-feature Multimodal Biometrics" which is accepted for publication in Information Fusion Journal (Elsevier).

Multimodal biometrics technology consolidates various information obtained from multiple sources at sensor level, feature level, match score level, and decision level. It is used to increase robustness and provide broader population coverage for inclusion. Due to the inherent challenges involved with feature-level fusion, combining multiple evidences is attempted at score, rank, or decision level where only a minimal amount of information is preserved. In this paper, we propose the Group Sparse Representation based Classifier (GSRC) which removes the requirement for a separate feature-level fusion mechanism and integrates multi-feature representation seamlessly into classification.

More information can be obtained here

CLOTHO: Saving Programs from Malformed Strings and Incorrect String-handling

Aritra Dhar, Rahul Purandare, Mohan Dhawan, and Suresh Rangaswamy co-authored the paper titled “CLOTHO: Saving Programs from Malformed Strings and Incorrect String-handling” which is accepted for publication in the joint meeting of the European Software Engineering Conference and the ACM SIGSOFT Symposium on the Foundations of Software Engineering (ESEC/FSE 2015).

Programs are susceptible to malformed data coming from untrusted sources. Occasionally the programming logic or constructs used are inappropriate to handle all types of constraints that are imposed by legal and well-formed data. As a result programs produce unexpected results or even worse, they may crash. Program behavior in both of these cases is highly undesirable. In this paper, we present a novel hybrid approach that saves programs from crashing when the failures originate from malformed strings or inappropriate handling of strings. Our approach statically analyses a program to identify statements that are vulnerable to failures related to associate string data. It then generates patches that are likely to satisfy constraints on the data, and in case of failures produce program behavior which would be close to the expected. The precision of the patches is improved with the help of a dynamic analysis. The patches are activated only after a failure is detected, and the technique incurs no runtime overhead during normal course of execution, and negligible overhead in case of failures. We have experimented with JAVA String API, and applied CLOTHO to several popular open-source libraries to patch 30 bugs, several of them rated either critical or major. Our evaluation shows that CLOTHO is both practical and effective. The comparison of the patches generated by our technique with the actual patches developed by the programmers in the later versions shows that they are semantically similar.

A Hardware and Thermal Analysis of DVFS in a Multi-Core System with Hybrid WNoC Architecture

Sri Harsha Gade, Hemanta Kumar Mondal and Sujay Deb co-authored the paper titled "A Hardware and Thermal Analysis of DVFS in a Multi-Core System with Hybrid WNoC Architecture" which is accepted for publication in 28th IEEE Internation Conference on VLSI Design (VLSID), 2015.

Evolution of CMOS manufacturing technologies has led to billions of transistors per chip. But maintaining this trend is a significant challenge due to the power and thermal issues. This further results in increased system temperature that can cause damage to the system. DVFS schemes reduce the power consumption without significant loss in system performance. In this paper, we design and evaluate a centralized DVFS control mechanism for multi core systems and discuss its merits and overheads. One of the major issues with centralized controllers, long delays in control signal transmission is alleviated by using wireless interfaces for transmitting controller signals along with the data signals. Finally the thermal profile of the proposed DVFS mechanism is analyzed and compared with normal operating conditions.

More information can be obtained here

QFuse: Online Learning Framework for Adaptive Biometrics

Samarth Bharadwaj, Himanshu S. Bhatt, Richa Singh, Mayank Vatsa, Afzel Noore co-authored the paper titled "QFuse: Online Learning Framework for Adaptive Biometrics" which is accepted for publication in Pattern Recognition Journal (Elsevier).

Existing biometric techniques are unable to provide significant levels of accuracy in uncontrolled noisy environments. Further, scalability is another challenge due to variations in data distribution with changing conditions. This paper presents an adaptive context switching algorithm coupled with online learning to address both these challenges. The proposed framework, termed as QFuse, uses the quality of input images to dynamically select the best biometric matcher or fusion algorithm to verify the identity of an individual.

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Ocular Biometrics: A Survey of Modalities and Fusion Approaches

Ishan Nigam, Mayank Vatsa, and Richa Singh co-authored the paper titled "Ocular Biometrics: A Survey of Modalities and Fusion Approaches" which is accepted for publication in Information Fusion Journal (Elsevier).

Biometrics, an integral component of Identity Science, is widely used in several large-scale-county-wide projects to provide a meaningful way of recognizing individuals. Among existing modalities, ocular biometric traits such as iris, periocular, retina, and eye movement have received significant attention in the recent past. This paper reviews the research progression in these modalities. The paper discusses existing algorithms and the limitations of each of the biometric traits and information fusion approaches which combine ocular modalities with other modalities. The paper also presents the future research directions in ocular biometric modalities.

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Three "Sparsity" based Papers in ICASSP2015

Angshul Majumdar co-authored three papers accepted for publication in 40th IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP) 2015.

Paper 1: Combining Sparsity with Rank-Deficiency for Energy Efficient EEG Sensing and Transmission over Wireless Body Area Network

This work proposes a new technique that allows reconstructing EEG signals from partial time samples. Partial sampling allows for energy efficient data acquisition; moreover it eliminates any processing step (therefore does not require any processing energy as well). The overall energy consumption reduces by half - meaning an overall extension of battery life by two-fold.

Paper 2: Learning the Sparsity Basis in Low-rank plus Sparse Model for Dynamic MRI Reconstruction

There are recent studies in dynamic MRI that separates the active foreground (sparse component) from the static background (low-rank) during image reconstruction itself. In this work, we learn the sparsity basis adaptively from the data, resultingin better reconstruction and separation.

Paper 3: Hyper-spectral Impulse Denoising: A row-sparse Blind Compressed Sensing Formulation

Traditionally wavelet and other sparsifying transforms have been used for removing noise from images. In this work, BCS formulation is used to learn the sparsifying basis on the fly. This allows better sparsification (since it is adapative) an in turn better denoising results.

Efficient Search with an Ensemble of Heuristics

Sandip Aine co-authored the paper titled "Efficient Search with an Ensemble of Heuristics" which is accepted for publication in International Joint Conference on Artificial Intelligence, 2015.

Recently works in search based planning have shown that using multiple heuristics in independent searches performs better than combining them into a single heuristic. Currently, these multi-heuristic searches use round-robin scheduling to distribute resources, which can be inefficient, especially when only a few heuristics are leading to progress. In this paper, we present two principled methods to adaptively distribute computation time among the different searches. We provide a theoretical analysis discussing the optimality of our methods and present experimental results on a 12-DOF full-body motion planning problem and on sliding tile puzzles.

Survival Analysis: Objective assessment of Wait Time in HCI

Siddhartha Asthana, Pushpendra Singh and Parul Gupta co-authored the paper titled "Survival Analysis: Objective assessment of Wait Time in HCI” which is accepted for publication in ACM Human Factors in Computing (ACM-CHI) 2015.

The paper encapsulates the first study on distress callers and presents survival analysis as an objective assessment method to evaluate temporal metaphors. Through a field experiment, the application of survival analysis has been demonstrated. It is observed that, the auditory progress bar, which becomes a temporal metaphor for audio interfaces successfully works for callers of a distress helpline.

More details about the work are available here.

EgoSampling: Fast-Forward and Stereo for Egocentric Videos

Chetan Arora co-authored the paper titled “EgoSampling: Fast-Forward and Stereo for Egocentric Videos” which is accepted for publication in IEEE Computer Vision and Pattern Recognition (CVPR) 2015.

Possibility of sharing one's own actions is popularizing the use of egocentric videos captured through Google Glass or GoPro. Always on nature of such cameras, makes egocentric videos long and boring. Fast forwarding is a natural solution but increases the shake, making fast forwarded videos impossible to watch. The paper proposes jointly solving fast forwarding and video stabilization problems by formulating it as energy minimization. Proposed technique can fast forward egocentric videos in almost real time.

More details about the work are available here.

Identity and Behavior Analysis: Two Sides of the Security Coin

Mayank Vatsa served as the panelist on “Identity and Behavior Analysis: Two Sides of the Security Coin” - a panel session at the IEEE International Conference on Identity, Security and Behavior Analysis (ISBA) 2015, Hong Kong. Other panelists were Brian C. Lovell (The University of Queensland, Australia), M. Angela Sasse (University College of London, UK), P.C. Yuen (Hong Kong Baptist University, Hong Kong) and chaired by Rama Chellappa (University of Maryland College Park, USA).

The panelists concluded that combining biometrics and behavior analysis can help improving the performance in inclusion services such as India’s Aadhaar project and make peoples’ life better.