About Me

Gonzalo Martinez is currently a 5th year PhD candidate (ABD) at the University of Notre Dame, working under supervision of Prof. Aaron Striegel.

Publications

• Detecting Job Promotion in the Workplace using Mobile Sensing
  Subigya K. Nepal, Shayan Mirjafari, Gonzalo J. Martinez, Pino Audia, Aaron D. Striegel, Andrew Campbell.
  Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies, vol. 4, no. 3, p. 113:1–113:28
• Characterizing Exploratory Behaviors on a Personal Visualization Interface Using Interaction Logs 
  Sukumar, P. T. , Martinez, G. J. , Grover, T. , Mark. G, D’Mello, S., Chawla, N. V. , Mattingly, S. M., Striegel, A. D.,
  Eurovis 2020
• Filling Missing Values on Wearable-Sensory Time Series Data
  Lin, S., Wu, X., Martinez, G. J.
  SIAM International Conference on Data Mining (SDM20)
• Martinez, G. J., Mattingly, S. M., Young, J., Faust. L, Dey, A., Campbell, A., Choudhury, M., Mirjafari, S., Nepal, S., Robles-Granda, P., Saha, K., Striegel, A. D., Improved Sleep Detection Through the Fusion of Phone Agent and Wearable Data Streams, Pervasive Computing Wristsense Workshop 2020 – Best Paper Honorable Mention
• Martinez, G. J., Mattingly, S. M., Mirjafari, S., Nepal, S., Campbell, A., Dey, A., Striegel, A. D., On the Quality of Real-world Wearable Data in a Longitudinal Study of Information Workers, Pervasive Computing Wristsense Workshop 2020
• Vedant Das Swain, Koustuv Saha, Hemang Rajvanshy, Anusha Sirigiri, Julie M. Gregg, Suwen Lin, Gonzalo J. Martinez, Stephen M. Mattingly, Shayan Mirjafari, Raghu Mulukutla, Subigya Nepal, Kari Nies, Manikanta D. Reddy, Pablo Robles-Granda, Andrew T. Campbell, Nitesh V. Chawla, Sidney D’Mello, Anind K. Dey, Kaifeng Jiang, Qiang Liu, Gloria Mark, Edward Moskal, Aaron Striegel, Louis Tay, Gregory D. Abowd, and Munmun De Choudhury. 2019. A Multisensor Person-Centered Approach to Understand the Role of Daily Activities in Job Performance with Organizational Personas. Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 3, 4: 130:1–130:27
• Koustuv Saha, Manikanta D. Reddy, Vedant das Swain, Julie M. Gregg, Ted Grover, Suwen Lin, Gonzalo J. Martinez, Stephen M. Mattingly, Shayan Mirjafari, Raghu Mulukutla, Kari Nies, Pablo Robles-Granda, Anusha Sirigiri, Dong Whi Yoo, Pino Audia, Andrew T. Campbell, Nitesh V. Chawla, Sidney K. D’Mello, Anind K. Dey, Kaifeng Jiang, Qiang Liu, Gloria Mark, Edward Moskal, Aaron Striegel, and Munmun de Choudhury. 2019. Imputing Missing Social Media Data Stream in Multisensor Studies of Human Behavior. In 2019 8th International Conference on Affective Computing and Intelligent Interaction (ACII), 178–184.
• Shayan Mirjafari, Kizito Masaba, Ted Grover, Weichen Wang, Pino Audia, Andrew T. Campbell, Nitesh V. Chawla, Vedant Das Swain, Munmun De Choudhury, Anind K. Dey, Sidney K. D’Mello, Ge Gao, Julie M. Gregg, Krithika Jagannath, Kaifeng Jiang, Suwen Lin, Qiang Liu, Gloria Mark, Gonzalo J. Martinez, Stephen M. Mattingly, Edward Moskal, Raghu Mulukutla, Subigya Nepal, Kari Nies, Manikanta D. Reddy, Pablo Robles-Granda, Koustuv Saha, Anusha Sirigiri, and Aaron Striegel. 2019. Differentiating Higher and Lower Job Performers in the Workplace Using Mobile Sensing. Proc. ACM Interact. Mob. Wearable Ubiquitous Technol. 3, 2, Article 37 (June 2019), 24 pages.
• Koustuv Saha, Ayse E. Bayraktaroglu, Andrew T. Campbell, Nitesh V. Chawla, Munmun De Choudhury, Sidney K. D’mello, Anind K. Dey, Ge Gao, Julie M. Gregg, Krithika Jagannath, Gloria Mark, Gonzalo J. Martinez, Stephen M. Mattingly, Edward Moskal, Anusha Sirigiri, Aaron Striegel, And Dong Whi Yoo. 2019. Social Media as A Passive Sensor in Longitudinal Studies of Human Behavior and Wellbeing. In Extended Abstracts of the 2019 Chi Conference on Human Factors in Computing Systems (CHI EA ’19). Association for Computing Machinery, New York, NY, USA, Paper CS12, 1–8.
• Stephen M. Mattingly, Julie M. Gregg, Pino Audia, Ayse Elvan Bayraktaroglu, Andrew T. Campbell, Nitesh V. Chawla, Vedant Das Swain, Munmun De Choudhury, Sidney K. D’mello, Anind K. Dey, Ge Gao, Krithika Jagannath, Kaifeng Jiang, Suwen Lin, Qiang Liu, Gloria Mark, Gonzalo J. Martinez, Kizito Masaba, Shayan Mirjafari, Edward Moskal, Raghu Mulukutla, Kari Nies, Manikanta D. Reddy, Pablo Robles-Granda, Koustuv Saha, Anusha Sirigiri, And Aaron Striegel. 2019. The Tesserae Project: Large-Scale, Longitudinal, In Situ, Multimodal Sensing of Information Workers. In Extended Abstracts of the 2019 Chi Conference on Human Factors in Computing Systems (CHI EA ’19). Association for Computing Machinery, New York, NY, USA, Paper CS11, 1–8
• Kleber, N., Termos, A., Martinez, G., Merritt, J., Hochwald, B., Chisum, J., … & Laneman, J. N. (2017, March). RadioHound: A pervasive sensing platform for sub-6 GHz dynamic spectrum monitoring. In 2017 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN) (pp. 1-2). IEEE.
• Martınez, G. J., & Val, L. (2015). Capataz: a framework for distributing algorithms via the World Wide Web. CLEI electronic journal, 18(08).
• Martínez, G., & Val, L. (2014, September). Implementing crossplatform distributed algorithms using standard web technologies. In 2014 XL Latin American Computing Conference (CLEI) (pp. 1-8). IEEE.

Research and Teaching Experience

University of Notre Dame

Research Assistant, Computer Science and Engineering

• Produced backend and mobile systems to support everyday operation of the Tesserae study, such as data collection, compliance computations, and participant communications.
• Designed the database schema with 100+ tables and 4TB in size. Parsed all data that is being used across 5 Universities in the Tesserae study for analysis.
• The Tesserae study is a year-long study of 750 participants where we use a combination of sensors and social media data to understand the behaviors that support good workplace performance.
• Analyzed compliance data, patterns of use of wearable technology, sleep data directly captured by a wearable, and the fusion of multiple sensors for more accurate sleep readings.
• Built a mobile application and gathered mobile network data using a Low Altitude Unmanned Aircraft Vehicle for the Drone Sounder project. Analyzed the results, produced a research paper (currently in editing), and an open-source dataset to be made public at the time of publishing.
• Created a prototype server backend and frontend for the Radiohound project, a custom spectrum sensing network capable of tuning from 25 MHz to 6 GHz, which covers nearly all widely-deployed wireless activity. The backend and frontend enabled us to see the data as it was coming in from the hardware sensors developed at ND in a close to real-time manner.

Universidad Catolica del Uruguay (2013 – 2016)

• Worked on the implementation of a framework for distributing algorithms using standard web technologies that resulted in two research papers in a top CS conference in Latin America.
• Lectured in the Object-Oriented Programming course. Was also a teaching assistant helping implement Team Based Learning methodology in Data Structures and Algorithms, Artificial Intelligence, and Functional Programming.

Professional Experience

Full Stack Software Developer, Web department, Decemberlabs (Jan 2016 – Aug 2016)

• Developed the backend and frontend of multiple web-based applications, as well as maintained and upgraded the backend of mobile applications for startups in the United States, resulting in ambitious projects being completed on time and on budget.
• The technology stack included MySQL, Yii, Laravel, Angular JS, HTML+CSS.

Senior Java Developer, Lithium Software (Oct 2013 – Feb 2016)

• Developed in-house applications for our client El Correo Uruguayo (post office of Uruguay).
• Upgraded and consolidated tracking applications in the agency by replacing several satellite applications with a web-based centralized server running on J2EE technology.

Web Developer, Freelance, (Apr 2008 – Aug 2016)

• Development of http://cotizadorlogistico.com (04/2015 – 08/2016)
• Development and maintenance of 15 different websites and an elementary school management system for my client RedTotal (04/2008 – 06/2010) .
• Academic Management System for Instituto Crandon – (06/2012 – 08/2016). As part of a three people team, developed and maintained a Java Web Application to substitute paper-based processes, i.e. creation, editing and validation of grades reports, creation of Ministry of Education required documentation, etc. Tasks developed included requirements analysis, development, documentation development and training employees in the use of the system developed. Technologies used during the project: Java, Git, Tomcat, Hibernate, Vaadin Framework, Eclipse IDE, MySQL running on top of an Ubuntu Server 2012 virtual machine.