Justin Zobel

Feed-forward Drift Compensation and Dynamic Allan Deviation of Lasers Locked to 200 mm Fabry-Perot Cavities

Justin Zobel, Jane Gilligan, Michelle O’Toole, Andy Goers et autres

We characterize the cavity-induced frequency drift of three continuous wave lasers stabilized to Fabry-Perot cavities by locking each laser to an optical frequency comb. The carrier-envelope-offset frequency signal of each optical frequency comb was locked to a 10 MHz oscillator stabilized to …

Feed-forward Drift Compensation and Dynamic Allan Deviation of Lasers Locked to 200 mm Fabry-Perot Cavities

Justin Zobel, Jane Gilligan, Michelle O’Toole, Andy Goers et autres

We characterize the cavity-induced frequency drift of three continuous wave lasers stabilized to Fabry-Perot cavities by locking each laser to an optical frequency comb. The carrier-envelope-offset frequency signal of each optical frequency comb was locked to a 10 MHz oscillator stabilized to …

FaE: A Resource of Logs, Profiles, and Rankings for Academic Expert Finding

Marjan Azimi, Alistair Moffat, Justin Zobel

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Performance Consistency of Learning Methods for Information Retrieval Tasks

Meng Yuan, Justin Zobel

A range of approaches have been proposed for estimating the accuracy or robustness of the measured performance of IR methods. One is to use bootstrapping of test sets, which, as we confirm, provides an estimate of variation in performance. For IR methods …

Expert Finding Revisited: A Uniform Exploration of Methods

Marjan Azimi, Alistair Moffat, Justin Zobel

The goal of expert search is to identify individuals with knowledge or skills in a specific field or for a specific problem. In the context of academia, expert search is enabled by resources such as publications, profiles, and authorship networks; with numerous …

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Online Computation of String Net Frequency

Peaker Guo, Seeun William Umboh, Anthony Wirth, Justin Zobel

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Query Variability and Experimental Consistency: A Concerning Case Study

Lida Rashidi, Justin Zobel, Alistair Moffat

In offline experimentation, the effectiveness of a search engine is evaluated using a document collection, a set of queries against that collection, a set of relevance judgments connecting the documents and the queries, and an effectiveness metric. This measurement pipeline is used …

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Online Computation of String Net Frequency

Peaker Guo, Seeun William Umboh, Anthony Wirth, Justin Zobel

The net frequency (NF) of a string, of length $m$, in a text, of length $n$, is the number of occurrences of the string in the text with unique left and right extensions. Recently, Guo et al. [CPM 2024] showed that NF …

Exploiting New Properties of String Net Frequency for Efficient Computation

Peaker Guo, P. Eades, Anthony Wirth, Justin Zobel

Knowing which strings in a massive text are significant -- that is, which strings are common and distinct from other strings -- is valuable for several applications, including text compression and tokenization. Frequency in itself is not helpful for significance, because the …

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Assessment of the Quality of Topic Models for Information Retrieval Applications

Meng Yuan, Lida Rashidi, Justin Zobel

Topic modelling is an approach to generation of descriptions of document collections as a set of topics where each has a distinct theme and documents are a blend of topics. It has been applied to retrieval in a range of ways, but …

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Report on the Dagstuhl Seminar on Frontiers of Information Access Experimentation for Research and Education

Christine Bauer, Ben Carterette, Nicola Ferro, Norbert Fuhr et autres

This report documents the program and the outcomes of Dagstuhl Seminar 23031 "Frontiers of Information Access Experimentation for Research and Education", which brought together 38 participants from 12 countries. The seminar addressed technology-enhanced information access (information retrieval, recommender systems, natural language processing) …

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The Impact of Judgment Variability on the Consistency of Offline Effectiveness Measures

Lida Rashidi, Justin Zobel, Alistair Moffat

Measurement of the effectiveness of search engines is often based on use of relevance judgments. It is well known that judgments can be inconsistent between judges, leading to discrepancies that potentially affect not only scores but also system relativities and confidence in …

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