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Posts
Regular expressions for replication
Published:
As part of the publication process for my recent article on how states preempt separatist conflict, I needed to submit replication materials to the journal. I took my graduate quantitative methods sequence with the late Tom Carsey, so I’ve long been a proponent replicability efforts in social science. I also had an hourly job in grad school replicating quantitative results for multiple political science journals, so I’m very familiar with best practices for replication. Unfortunately, in the four years since I wrote the first line of code for this project, somewhere in between defending my dissertation and starting a new job (ok, fine, almost immediately after writing that first line of code), I got a little lazy.
Faceted maps in R
Published:
I recently needed to create a choropleth of a few different countries for a project on targeting of UN peacekeepers by non-state armed actors I’m working on. A choropleth is a type of thematic map where data are aggregated up from smaller areas (or discrete points) to larger ones and then visualized using different colors to represent different numeric values.
Finding Backcountry Campsites with CalTopo, OpenStreetMap, and R
Published:
Like many people, I’ve been spending more time outdoors during this pandemic. While this means daily walks in my neighborhood, it also means getting out into the wilderness and sleeping in a tent when I can. Although outdoor recreation is one of the safer ways to entertain yourself these days, it’s not without its own concerns. The difficulty of safely getting to trailheads means that while I’m backpacking more than usual, it’s still not as often as I’d like.
R Markdown, Jekyll, and Footnotes
Published:
I use jekyll to create my website. Jekyll converts Markdown files into the HTML that your browser renders into the pages you see. As others and I have written before, it’s pretty easy to use R Markdown to generate pages with R code and output all together. One thing has consistently eluded me, however: footnotes.
Working with Large Spatial Data in R
Published:
In my research I frequently work with large datasets. Sometimes that means datasets that cover the entire globe, and other times it means working with lots of micro-level event data. Usually, my computer is powerful enough to load and manipulate all of the data in R without issue. When my computer’s fallen short of the task at hand, my solution has often been to throw it at a high performance computing cluster. However, I finally ran into a situation where the data proved too large even for that approach.
Jekyll and HTML Widgets
Published:
I’m currently compiling a list of university-affiliated programs designed to help prepare students for graduate study in political science and assist them in the process of applying to graduate school (a labyrinthine and opaque process in many regards). Since travel costs can be a deciding factor for some students when deciding whether to apply to these programs, I thought it would be nice to also put them on a map.
Extracting UN Peacekeeping Data from PDF Files
Published:
Some coauthors and I recently published a piece in the Monkey Cage on the recent military coup in Mali and the overthrow of president Ibrahim Boubacar Keïta. We examine what the ouster of Keïta means for the future of MINUSMA, the United Nations peacekeeping mission in Mali. One of my contributions that didn’t make the final cut was this plot of casualties to date among UN peacekeepers in the so-called big 5 peacekeeping missions .
Adding Content to an Academic Website
Published:
One thing I haven’t covered in my previous posts on creating and customizing an academic website is how to actually add content to your site. You know, the stuff that’s the reason why people go to your website in the first place? If you’ve followed those guides, your website should be professional looking and already feeling a little bit different from the stock template. However, adding new pages or tweaking the existing pages can be a little intimidating, and I realized I should probably walk through how to do so. Luckily Jekyll’s use of Markdown makes it really easy to add new content!
Customizing an Academic Website
Published:
This is a followup to my previous post on creating an academic website. If you’ve followed that guide, you should have a website that’s professional-looking and informative, but it’s probably lacking something to really make it feel like your own. There are an infinite number of ways you could customize the academicpages template (many of them far, far beyond my abilities) but I’m going to walk you through the process I used to start tweaking my website. The goal here isn’t to tell you how you should personalize your website, but to give you the tools to learn how to implement whatever changes you want to make.
Building an Academic Website
Published:
If you’re an academic, you need a website. Obviously I agree with this since you’re reading this on my website, but if you don’t have one, you should get one. Most universities these days provide a free option, usually powered by WordPress (both WashU and UNC use WordPress for their respective offerings). While these sites are quick to set up and come with the prestige of a .edu URL, they have several drawbacks that have been extensively written on.
Visualizing Police Militarization
Published:
Much has been written lately about the increasing militarization of US law enforcement. One of the most visible indicators of this shift in recent decades is the increased frequency of tactical gear and equipment worn and carried by police officers. However, this pales in comparison to images of police departments bringing armored vehicles to peaceful protests.
Counting Words in a Snap
Published:
14 pt periods. 1.05” margins. 2.1 spaced lines. Times Newer Roman. I’ve seen them all, and I’m tired of trying to catch them. So, I’ve stopped assigning papers in terms of page length and switched to word counts. Unfortunately, counting words is more time-intensive than counting pages.
Better Beamer Presentations the Easy Way
Published:
Everyone knows that Beamer makes frankly terrible presentations without a good deal of help. A well crafted Beamer presentation can be a thing of beauty, especially since you can use knitr or R Markdown to automatically generate tables and figures, but it takes a lot of work.
Checking Progress with Bash
Published:
I’m currently cleaning and wrangling a large (> 2 billion observations) dataset. Due to its size, I’m running code in batch mode on a remote cluster. Not running interactively makes it harder for me to check on my code’s progress.
Fancy Icons and LaTeX Quirks
Published:
I recently updated my CV to add my ORCiD identifier to it up top among the other places to find me online. An ORCiD is an online identifier that persists through any changes to your name, institution, or email address throughout your life.
Combining PDF Documents the Smarter Way
Published:
My previous post on combining multiple PDF files had an important caveat that things would end up in the wrong order if you had files with leading ID numbers that started at 1 and ended at 12, you’d end up with PDFs combined in the order 1, 10, 11, 12, 2, 3, …, 9.
Combining PDF Documents
Published:
How many times have you found that your institution has access to a digital version of a book you need only to discover that it comes in 15 different PDF files?
publications
Relay and power allocation schemes for OFDM-based cognitive radio systems
D Bharadia, G Bansal, P Kaligineedi, VK Bhargava,
IEEE Transactions on Wireless Communications
81 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=17628760006216262567
Practical, real-time, full duplex wireless
M Jain, JI Choi, T Kim, D Bharadia, S Seth, K Srinivasan, P Levis, S Katti, P Sinha,
Mobicom 2011
1654 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=6988250277139539361
QualComp: a new lossy compressor for quality scores based on rate distortion theory
I Ochoa, H Asnani, D Bharadia, M Chowdhury, T Weissman, G Yona,
BMC bioinformatics 2013
58 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=7038725991341840687
Full duplex radios
D Bharadia, E McMilin, S Katti,
Proceedings of the ACM SIGCOMM 2013 conference on SIGCOMM
2112 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=12399399471434081038
Full duplex MIMO radios
D Bharadia, S Katti,
11th USENIX Symposium on Networked Systems Design and Implementation
419 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=7009557832919391403
Fastforward: Fast and constructive full duplex relays
D Bharadia, S Katti,
ACM SIGCOMM Computer Communication Review
96 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=1285871949197835477
Wideo: Fine-grained device-free motion tracing using RF backscatter
K Joshi, D Bharadia, M Kotaru, S Katti,
12th USENIX Symposium on Networked Systems Design and Implementation
152 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=16800494916549127560
Backfi: High throughput wifi backscatter
D Bharadia, KR Joshi, M Kotaru, S Katti,
ACM SIGCOMM 2015
359 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=9368376063280010959
Spotfi: Decimeter level localization using wifi
M Kotaru, K Joshi, D Bharadia, S Katti
ACM SIGCOMM 2015
935 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=11027465511092921527
Numfabric: Fast and flexible bandwidth allocation in datacenters
K Nagaraj, D Bharadia, H Mao, S Chinchali, M Alizadeh, S Katti,
ACM SIGCOMM 2016
81 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=12638641209357825109
Hitchhike: Practical backscatter using commodity wifi
P Zhang, D Bharadia, K Joshi, S Katti
ACM SENSYS 2016 -- (Best paper award nominee)
165 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=3231133807055811837
Enabling high-quality untethered virtual reality
O Abari, D Bharadia, A Duffield, D Katabi,
NSDI 2017 -- Acceptance rate 18% (46 papers accepted out of 255 submitted)
126 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=5103195521437052288
Freerider: Backscatter communication using commodity radios
P Zhang, C Josephson, D Bharadia, S Katti,
ACM CoNEXT 2017 -- Acceptance rate 18.3% (41 papers accepted out of 223 submitted)
73 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=2207608068708370638
BLoc: CSI-based accurate localization for BLE tags
R Ayyalasomayajula, D Vasisht, D Bharadia,
ACM CoNEXT 2018 -- Acceptance rate 17.2% (32 papers accepted out of 185 submitted)
32 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=2387300467601962233
Sweepsense: Sensing 5 ghz in 5 milliseconds with low-cost radios
Y Guddeti, R Subbaraman, M Khazraee, A Schulman, D Bharadia,
NSDI 2020 -- Acceptance rate 12.5% (30 papers accepted out of 240 submitted)
10 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=14234708084808496076
Capttery: Scalable battery-like room-level wireless power
C Zhang, S Kumar, D Bharadia,
ACM Mobisys 2019 -- Acceptance rate 22 (39 papers accepted out of 172 submitted)
4 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=16351981963794167443
Signet: Semantic instance aided unsupervised 3d geometry perception
Y Meng, Y Lu, A Raj, S Sunarjo, R Guo, T Javidi, G Bansal, D Bharadia,
IEEE/CVF CVPR 2019
26 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=9357944003335228407
Sparsdr: Sparsity-proportional backhaul and compute for sdrs
M Khazraee, Y Guddeti, S Crow, AC Snoeren, K Levchenko, D Bharadia, A Schulman,
ACM Mobisys 2019 -- Acceptance rate 22 (39 papers accepted out of 172 submitted)
5 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=17100681048462830739
LocAP: Autonomous Millimeter Accurate Mapping of WiFi Infrastructure
Roshan Ayyalasomayajula, Aditya Arun, Chenfeng Wu, Shrivatsan Rajagopalan, Ish Jain, Dinesh Bharadia,
NSDI 2020 -- Acceptance rate 17.5% (48 papers accepted out of 275 submitted)
7 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=966029656364373257
\(S^3\) Net: Semantic-Aware Self-supervised Depth Estimation with Monocular Videos and Synthetic Data
B Cheng, IS Saggu, R Shah, G Bansal, D Bharadia,
European Conference on Computer Vision (acceptance rate 26%)
6 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=2729708241956805516
A low-power backscatter modulation system communicating across tens of meters with standards-compliant wi-fi transceivers
PHP Wang, C Zhang, H Yang, M Dunna, D Bharadia, PP Mercier,
IEEE Journal of Solid-State Circuits (ISSCC 2020)
2 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=11843764222899462876
Deep learning based wireless localization for indoor navigation
R Ayyalasomayajula, A Arun, C Wu, S Sharma, AR Sethi, D Vasisht, D Bharadia,
ACM Mobicom 2020 -- Acceptance rate 16% (62 papers accepted out of 384 submitted)
25 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=34378211762698709
ScatterMIMO: Enabling virtual MIMO with smart surfaces
M Dunna, C Zhang, D Sievenpiper, D Bharadia
ACM Mobicom 2020 -- Acceptance rate 16% (62 papers accepted out of 384 submitted)
27 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=9406824394284923402
DroneScale: drone load estimation via remote passive RF sensing
Phuc Nguyen, Vimal Kakaraparthi, Nam Bui, Nikshep Umamahesh, Nhat Pham, Hoang Truong, Yeswanth Guddeti, Dinesh Bharadia, Richard Han, Eric Frew, Daniel Massey, Tam Vu,
Sensys 2020 -- Acceptance rate 20% (43 papers accepted out of 213 submitted
1 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=12285452767937590149
HarvestNet: Mining Valuable Training Data from High-Volume Robot Sensory Streams
S Chinchali, E Pergament, M Nakanoya, E Cidon, E Zhang, D Bharadia, M Pavone, S Katti,
ISER 2020
Pointillism: accurate 3D bounding box estimation with multi-radars
K Bansal, K Rungta, S Zhu, D Bharadia
Sensys 2020 -- Acceptance rate 20% (43 papers accepted out of 213 submitted)
2 cites: https://scholar.google.com/scholar?oi=bibs\&hl=en\&cites=3637153603386786697
Sampling Training Data for Continual Learning Between Robots and the Cloud
S Chinchali, E Pergament, M Nakanoya, E Cidon, E Zhang, D Bharadia, M Pavone, S Katti,
ISER 2020 -- Experimental Robotics
Towards a wireless force sensor based on wave backscattering for medical applications
C Girerd, Q Zhang, A Gupta, M Dunna, D Bharadia, TK Morimoto
IEEE Sensors Journal
Two beams are better than one: towards reliable and high throughput mmWave links
SyncScatter: Enabling WiFi like synchronization and range for WiFi backscatter Communication.
M Dunna, M Meng, PH Wang, C Zhang, PP Mercier, D Bharadia,
NSDI 2021 (Acceptance rate 15% -- 40 papers accepted out of 255 submitted)
WiForce: Wireless Sensing and Localization of Contact Forces on a Space Continuum.
A Gupta, C Girerd, M Dunna, Q Zhang, R Subbaraman, T Morimoto, D Bharadia,
NSDI 2021 (Acceptance rate 15% -- 40 papers accepted out of 255 submitted)
SSLIDE: Sound Source Localization for Indoors Based on Deep Learning
Y Wu, R Ayyalasomayajula, MJ Bianco, D Bharadia, P Gerstoft,
ICASSP 2021-- IEEE International Conference on Acoustics, Speech and Signal Processing
ULoc: Low-Power, Scalable and cm-Accurate UWB-Tag Localization and Tracking for Indoor Applications
M Zhao, T Chang, A Arun, R Ayyalasomayajula, C Zhang, D Bharadia,
ACM UbiComp 2021 (Acceptance rate of close to 15%)
ZLeaks: Passive Inference Attacks on Zigbee based Smart Homes
N Shafqat, DJ Dubois, D Choffnes, A Schulman, D Bharadia, A Raghunathan,
ACM/IEEE ANCS 2021
Evaluating Physical-Layer BLE Location Tracking Attacks on Mobile Devices
H Givehchian, N Bhaskar, ER Herrera, HRL Soto, C Dameff, D Bharadia, A Schulman
IEEE Symposium on Security and Privacy 2022 -- Acceptance rate 14.7% (36 papers accepted out of 244 submitted) my group
research
talks
Sensing the Physical World with RF: Self-Interferometry & Passive-Interferometry
Use Google Scholar for full citation
teaching
ECE 157A
Undergraduate course, UC San Diego, Electrical and Computer Engineering, Winter, 2020
This is a description of a teaching experience. You can use markdown like any other post.
ECE 257B
Workshop, UC San Diego, Electrical and Computer Engineering, winter, 2020
This is a description of a teaching experience. You can use markdown like any other post.
ECE 101
Undergraduate course, UC San Diego, Electrical and Computer Engineering, spring, 2020
This is a description of a teaching experience. You can use markdown like any other post.
ECE 157B
Undergraduate course, UC San Diego, Electrical and Computer Engineering, spring, 2020
This is a description of a teaching experience. You can use markdown like any other post.