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We present a new oblivious RAM that supports variable-sized storage blocks (vORAM), which is the first ORAM to allow varying block sizes without trivial padding. We also present a new history-independent data structure (a HIRB tree) that…

Cryptography and Security · Computer Science 2015-11-23 Daniel S. Roche , Adam J. Aviv , Seung Geol Choi

Retrieval-Augmented Generation (RAG) systems are increasingly deployed on large-scale document collections, often comprising millions of documents and tens of millions of text chunks. In industrial-scale retrieval platforms, scalability is…

Information Retrieval · Computer Science 2026-01-08 Dario Maio , Stefano Rizzi

Recent advances with in-memory columnar database techniques have increased the performance of analytical queries on very large databases and data warehouses. At the same time, advances in artificial intelligence (AI) algorithms have…

Databases · Computer Science 2017-12-11 Brad Carlile , Akiko Marti , Guy Delamarter

Growing main memory sizes have facilitated database management systems that keep the entire database in main memory. The drastic performance improvements that came along with these in-memory systems have made it possible to reunite the two…

Databases · Computer Science 2012-08-02 Florian Funke , Alfons Kemper , Thomas Neumann

Modern analytical workloads increasingly combine relational data with array-valued attributes. While columnar database systems efficiently process such workloads, their ability to optimize queries that interleave relational operators with…

Databases · Computer Science 2026-04-03 Maroua Zeblah , Etienne Couritas , Sarah Chlyah , Pierre Genevès , Nils Gesbert , Nabil Layaïda

As XML becomes ubiquitous and XML storage and processing becomes more efficient, the range of use cases for these technologies widens daily. One promising area is the integration of XML and data warehouses, where an XML-native database…

Databases · Computer Science 2009-12-08 Serge Boucher , Boris Verhaegen , Esteban Zimányi

The exploration of whether agents can align with their environment without relying on human-labeled data presents an intriguing research topic. Drawing inspiration from the alignment process observed in intelligent organisms, where…

Computation and Language · Computer Science 2024-03-06 Bo Wang , Tianxiang Sun , Hang Yan , Siyin Wang , Qingyuan Cheng , Xipeng Qiu

The ability of artificial agents to increment their capabilities when confronted with new data is an open challenge in artificial intelligence. The main challenge faced in such cases is catastrophic forgetting, i.e., the tendency of neural…

Machine Learning · Computer Science 2020-12-16 Eden Belouadah , Adrian Popescu , Ioannis Kanellos

Descriptive Analytics is the summarization of the past data and generates some useful patterns from that data. This work focuses on analyzing and querying large academic dataset for generating Student Progression using visualization and…

Software Engineering · Computer Science 2018-05-10 Harkiran Kaur , Aanchal Phutela

In this research paper so as to handle Information warehousing as well as online synthetic dispensation OLAP are necessary aspects of conclusion support which takes more and more turn into a focal point of the data source business.This…

Distributed, Parallel, and Cluster Computing · Computer Science 2016-12-28 Ahmed Mateen , Lareab Chaudhary

Business process simulation is a well-known approach to estimate the impact of changes to a process with respect to time and cost measures -- a practice known as what-if process analysis. The usefulness of such estimations hinges on the…

Artificial Intelligence · Computer Science 2022-07-14 Manuel Camargo , Marlon Dumas , Oscar González-Rojas

The fundamental goal of business data analysis is to improve business decisions using data. Business users often make decisions to achieve key performance indicators (KPIs) such as increasing customer retention or sales, or decreasing…

Databases · Computer Science 2022-02-10 Sneha Gathani , Madelon Hulsebos , James Gale , Peter J. Haas , Çağatay Demiralp

Existing off-policy reinforcement learning algorithms often rely on an explicit state-action-value function representation, which can be problematic in high-dimensional action spaces due to the curse of dimensionality. This reliance results…

Machine Learning · Computer Science 2025-02-18 Fabian Otto , Philipp Becker , Ngo Anh Vien , Gerhard Neumann

With the more and more growing demand for semantic Web services over large databases, an efficient evaluation of Datalog queries is arousing a renewed interest among researchers and industry experts. In this scenario, to reduce memory…

Artificial Intelligence · Computer Science 2020-02-19 Alessio Fiorentino , Nicola Leone , Marco Manna , Simona Perri , Jessica Zangari

Modern Hybrid Transactional/Analytical Processing (HTAP) systems use an integrated data processing engine that performs analytics on fresh data, which are ingested from a transactional engine. HTAP systems typically consider data freshness…

Databases · Computer Science 2020-04-15 Aunn Raza , Periklis Chrysogelos , Angelos Christos Anadiotis , Anastasia Ailamaki

Decisional systems are based on multidimensional databases improving OLAP analyses. The paper describes a new OLAP operator named "BLEND" to perform multigradual analyses. The operation transforms multidimensional structures during querying…

Databases · Computer Science 2010-05-04 Gilles Hubert , Olivier Teste

We consider the problem of \emph{optimal matching with queues} in dynamic systems and investigate the value-of-information. In such systems, the operators match tasks and resources stored in queues, with the objective of maximizing the…

Optimization and Control · Mathematics 2015-03-30 Longbo Huang

Dimensionality reduction (DR) is a well-established approach for the visualization of high-dimensional data sets. While DR methods are often applied to typical DR benchmark data sets in the literature, they might suffer from high runtime…

Machine Learning · Computer Science 2024-08-09 Luca Reichmann , David Hägele , Daniel Weiskopf

Off-policy evaluation (OPE) in contextual bandits has seen rapid adoption in real-world systems, since it enables offline evaluation of new policies using only historic log data. Unfortunately, when the number of actions is large, existing…

Machine Learning · Computer Science 2022-06-17 Yuta Saito , Thorsten Joachims

Recent end-to-end task oriented dialog systems use memory architectures to incorporate external knowledge in their dialogs. Current work makes simplifying assumptions about the structure of the knowledge base, such as the use of triples to…

Computation and Language · Computer Science 2020-09-30 Revanth Reddy , Danish Contractor , Dinesh Raghu , Sachindra Joshi