Haojian Jin

Corona: Positioning Adjacent Device with Asymmetric Bluetooth Low Energy RSSI Distributions

We introduce Corona, a novel spatial sensing technique that implicitly locates adjacent mobile devices by examining asymmetric Bluetooth Low Energy RSSI distributions. The phenomenon underlying Corona is that the Bluetooth RSSI distributions around the device are distinguishable because of the off-center antenna and asymmetric radio frequency field pattern. By comparing the real-time RSSI readings against a RSSI distribution model, each device can derive the relative position of the other adjacent device.

Haojian Jin, Cheng Xu, and Kent Lyons. "Corona: Positioning Adjacent Device with Asymmetric Bluetooth Low Energy RSSI Distributions," In Proceedings of UIST '15. [paper] [presentation] [video]

Tracko: Relative 3D Tracking For Ad-hoc Cross-Device Interaction

We present Tracko, a relative 3D tracking system between two or more commodity devices without added components or device synchronization. Tracko achieves this by fusing three signal types: 1) The strength of Bluetooth low energy signals reveals the presence and rough distance to other devices. 2) A series of inaudible stereo sounds and the difference in their arrival times on all devices produces a set of accurate distances between devices. 3) Tracko incorporates inertial sensors to refine 3D estimates and support quick interactions.

Haojian Jin, Christian Holz, Kasper Hornbæk. "Tracko: Ad-hoc Mobile 3D Tracking Using Bluetooth Low Energy and Inaudible Signals for Cross-Device Interaction," In Proceedings of UIST '15.
[paper] [presentation] [video]

ReviewCollage: A Mobile Interface for Direct Comparison Using Online Reviews

Review comments posted in online websites can help the user decide a product to purchase or place to visit. They can also be useful to closely compare a couple of candidate entities. However, the user may have to read different webpages back and forth for comparison, and this is not desirable particularly when she is using a mobile device. We present ReviewCollage, a mobile interface that aggregates information about two reviewed entities in a one-page view.

Haojian Jin, Tetsuya Sakai, and Koji Yatani. "ReviewCollage: A Mobile Interface for Direct Comparison Using Online Reviews," In Proceedings of MobileHCI 2014. [paper] [presentation] [video]
MobileHCI Honorable Mention Award, top 5%

Mobile HCI
Mining touch interaction data

In this paper, we present the first in-depth study of modeling interactions on touch-enabled device for improving Web search ranking. In particular, we evaluate a variety of touch interactions on a smart phone as implicit relevance feedback, and compare them with the corresponding fine-grained interactions on a desktop computer with mouse and keyboard as the primary input devices.

Qi Guo, Haojian Jin, Dmitry Lagun, Shuai Yuan, and Eugene Agichtein.
"Mining touch interaction data on mobile devices to predict web search result relevance," In Proceedings of SIGIR 2013 [paper]
"Towards estimating web search result relevance from touch interactions on mobile devices," In SIGCHI 2013 Extended Abstracts [paper].

acm computing reviews
Rapid Construction of Speech Enabled Applications for Android

Despite the prevalence of libraries that provide speech recognition and text-to-speech synthesis “in the cloud”, it remains difficult for developers to create user-friendly, consistent spoken language interfaces to their mobile applications. In this paper, we present the Speechify / Cohort libraries for rapid speech enabling of Android applications.

Tejaswi Kasturi, Haojian Jin, Aasish Pappu, Sungjin Lee Beverly Harrison, Ramana Murthy, Amanda Stent. "The Cohort and Speechify Libraries for Rapid Construction of Speech Enabled Applications for Android". In Proceedings of SIGDIAL 2015 (SIGDIAL 2015). [paper]

memory impairment detection
Web-based Behavioral Diagnostics for early detection of memory impairment

Deficits in memory are the clinical hallmark of Alzheimer's disease. Visual Paired Comparison (VPC) task is a recognition memory task that assesses the proportion of time an individual spends viewing a novel picture compared to a recently seen (familiar) picture. This project proposed a web-based test to measures visual recognition memory by observing how a patient views familiar or novel images which has been shown to be effective in the clinical setting.

[project page]

A continuously improving search engine with Click-through data

Sharp Search is a personalized search engine which can automatically optimize the retrieval quality of search using clickthrough data. In this project, I focused on the clickthough data in a search engine, and re-calculate the relevance score based on my click history. From May 3rd to June 3rd 2010, I hosted Sharp search on my laptop and collected all my search queries and behavior data for this experiment.

[project page]

Chinese word segmentation

This project was a part of the project "Culture Grid - Dunhuang" in Knowledge Grid Group. "Dunhuang" is an important tourist attraction and the subject of lots of ongoing archaeological projects. The goal of "Culture Grid" is to manage the continuous research progress in Archaeology research and improve the sociologists' collaboration. Since most manuscripts are written in classical Chinese, this project was to implement the information extraction in classical Chinese.

[project page]