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1. Sensemaking Strategies with Immersive Space to Think

   Lisle, Lee; Davidson, Kylie; Gitre, Edward J.K.; North, Chris; Bowman, Doug A. (July 2021, IEEE Virtual Reality 2021)

   null (Ed.)

   The process of sensemaking involves foraging through and extracting information from large sets of documents, and it can be a cognitively intensive task. A recent approach, the Immersive Space to Think (IST), allows analysts to browse, read, mark up documents, and use immersive 3D space to organize and label collections of documents. In this study, we observed seventeen novice analysts perform a historical analysis task in order to understand how users utilize the features of IST to extract meaning from large text-based datasets. We found three different layout strategies they employed to create meaning with the documents we provided. We further found patterns of interaction and organization that can inform future improvements to the IST approach. 

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2. Reverse Space‐Time Nonlocal Sine‐Gordon/Sinh‐Gordon Equations with Nonzero Boundary Conditions

   https://doi.org/10.1111/sapm.12222  

   Ablowitz, Mark J.; Feng, Bao‐Feng; Luo, Xu‐Dan; Musslimani, Ziad H. (July 2018, Studies in Applied Mathematics)

   Abstract Nonlocal reverse space‐time Sine/Sinh‐Gordon type equations were recently introduced. They arise from a remarkably simple nonlocal reduction of the well‐known AKNS scattering problem, hence, they constitute an integrable evolution equations. Furthermore, the inverse scattering transform (IST) for rapidly decaying data was also constructed. In this paper, the IST for these novel nonlocal equations corresponding to nonzero boundary conditions (NZBCs) at infinity is presented. The NZBC problem is more complex due to the intricate branching structure of the associated linear eigenfunctions. Two cases are analyzed, which correspond to two different values of the phase at infinity. Special soliton solutions are discussed and explicit 1‐soliton and 2‐soliton solutions are found. Both spatially independent and spatially dependent boundary conditions are considered. 

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3. Efficient top-k document retrieval

   Mallia, Antonio (January 2019, Proceedings of the 9th PhD Symposium on Future Directions in Information Access)

   Over the past few decades, the IR community has been making a continuous effort to improve the efficiency of search in large collections of documents. Query processing is still one of the main bottlenecks in large-scale search systems. The top-k document retrieval problem, which can be defined as reporting the k most relevant documents from a collection for a given query, can be extremely expensive, as it involves scoring large amounts of documents. In this work, we investigate the top-k document retrieval problem from several angles with the aim of improving the efficiency of this task in large-scale search systems. Finally, we briefly describe our initial findings and conclude by proposing future directions to follow. 

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4. Inverse scattering transform for continuous and discrete space‐time‐shifted integrable equations

   https://doi.org/10.1111/sapm.12764  

   Ablowitz, Mark_J; Musslimani, Ziad_H; Ossi, Nicholas_J (September 2024, Studies in Applied Mathematics)

   Abstract Nonlocal integrable partial differential equations possessing a spatial or temporal reflection have constituted an active research area for the past decade. Recently, more general classes of these nonlocal equations have been proposed, wherein the nonlocality appears as a combination of a shift (by a real or a complex parameter) and a reflection. This new shifting parameter manifests itself in the inverse scattering transform (IST) as an additional phase factor in an analogous way to the classical Fourier transform. In this paper, the IST is analyzed in detail for several examples of such systems. Particularly, time, space, and space‐time‐shifted nonlinear Schrödinger (NLS) and space‐time‐shifted modified Korteweg‐de Vries equations are studied. Additionally, the semidiscrete IST is developed for the time, space, and space‐time‐shifted variants of the Ablowitz–Ladik integrable discretization of the NLS. One‐soliton solutions are constructed for all continuous and discrete cases. 

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5. The effects of presentation method and simulation fidelity on psychomotor education in a bimanual metrology training simulation

   https://doi.org/10.1109/3DUI.2017.7893318  

   Bertrand, Jeffrey; Bhargava, Ayush; Madathil, Kapil Chalil; Gramopadhye, Anand; Babu, Sabarish V. (January 2017, 2017 IEEE Symposium on 3D User Interfaces (3DUI))

   null (Ed.)

   In this study, we empirically evaluated the effects of presentation method and simulation fidelity on task performance and psychomotor skills acquisition in an immersive bimanual simulation towards precision metrology education. In a 2 × 2 experiment design, we investigated a large-screen immersive display (LSID) with a head-mounted display (HMD), and the presence versus absence of gravity. Advantages of the HMD include interacting with the simulation in a more natural manner as compared to using a large-screen immersive display due to the similarities between the interactions afforded in the virtual compared to the real-world task. Suspending the laws of physics may have an effect on usability and in turn could affect learning outcomes. Our dependent variables consisted of a pre and post cognition questionnaire, quantitative performance measures, perceived workload and system usefulness, and a psychomotor assessment to measure to what extent transfer of learning took place from the virtual to the real world. Results indicate that the HMD condition was preferable to the immersive display in several metrics while the no-gravity condition resulted in users adopting strategies that were not advantageous for task performance. 

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