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- research-articleJune 2024
Investigating Translation Invariance and Shiftability in CNNs for Robust Multimedia Forensics: A JPEG Case Study
IH&MMSec '24: Proceedings of the 2024 ACM Workshop on Information Hiding and Multimedia SecurityPages 53–63https://doi.org/10.1145/3658664.3659644Convolutional Neural Networks (CNNs) have been the state of the art in many applications, including computer vision and multimedia forensics. Translation invariance is often included among the reasons for their success. However, the recent literature has ...
- extended-abstractMay 2024
Neurological Based Timing Mechanism for Reinforcement Learning
AAMAS '24: Proceedings of the 23rd International Conference on Autonomous Agents and Multiagent SystemsPages 2504–2506The inherently time-dependent dynamics which underly the neuronal spiking communication, are ubquitous throughout brain, and yet are not fully understood. Likewise time-based mechanisms are underdeveloped in the field of Machine and Reinforcement ...
- research-articleOctober 2023
Periodicity May Be Emanative: Hierarchical Contrastive Learning for Sequential Recommendation
CIKM '23: Proceedings of the 32nd ACM International Conference on Information and Knowledge ManagementPages 2442–2451https://doi.org/10.1145/3583780.3615007Nowadays, contrastive self-supervised learning has been widely incorporated into sequential recommender systems. However, most existing contrastive sequential recommender systems simply emphasize the overall information of interaction sequences, thereby ...
- research-articleJanuary 2023
Random periodic oscillations and global mean-square exponential stability of discrete-space and discrete-time stochastic competitive neural networks with Dirichlet boundary condition
Journal of Intelligent & Fuzzy Systems: Applications in Engineering and Technology (JIFS), Volume 45, Issue 3Pages 3729–3748https://doi.org/10.3233/JIFS-230821The current article explores the affects of space-time discrete stochastic competitive neural networks. In line with a discrete-space and discrete-time constant variation formula, boundedness and stability are addressed to the space-time discrete ...
- research-articleAugust 2022
Learning to Rotate: Quaternion Transformer for Complicated Periodical Time Series Forecasting
KDD '22: Proceedings of the 28th ACM SIGKDD Conference on Knowledge Discovery and Data MiningPages 146–156https://doi.org/10.1145/3534678.3539234Time series forecasting is a critical and challenging problem in many real applications. Recently, Transformer-based models prevail in time series forecasting due to their advancement in long-range dependencies learning. Besides, some models introduce ...
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- research-articleMarch 2021
Relation-aware Meta-learning for E-commerce Market Segment Demand Prediction with Limited Records
WSDM '21: Proceedings of the 14th ACM International Conference on Web Search and Data MiningPages 220–228https://doi.org/10.1145/3437963.3441750E-commerce business is revolutionizing our shopping experiences by providing convenient and straightforward services. One of the most fundamental problems is how to balance the demand and supply in market segments to build an efficient platform. While ...
- research-articleOctober 2020
Deep Behavior Tracing with Multi-level Temporality Preserved Embedding
CIKM '20: Proceedings of the 29th ACM International Conference on Information & Knowledge ManagementPages 2813–2820https://doi.org/10.1145/3340531.3412696Behavior tracing or predicting is a key component in various application scenarios like online user modeling and ubiquitous computing, which significantly benefits the system design (e.g., resource pre-caching) and improves the user experience (e.g., ...
- research-articleJuly 2019
I/O Scheduling Strategy for Periodic Applications
ACM Transactions on Parallel Computing (TOPC), Volume 6, Issue 2Article No.: 7, Pages 1–26https://doi.org/10.1145/3338510With the ever-growing need of data in HPC applications, the congestion at the I/O level becomes critical in supercomputers. Architectural enhancement such as burst buffers and pre-fetching are added to machines but are not sufficient to prevent ...
- research-articleMay 2019
Learning from Multiple Cities: A Meta-Learning Approach for Spatial-Temporal Prediction
Spatial-temporal prediction is a fundamental problem for constructing smart city, which is useful for tasks such as traffic control, taxi dispatching, and environment policy making. Due to data collection mechanism, it is common to see data collection ...
- articleFebruary 2019
Periodicity for the fourier quantum walk on regular graphs
Quantum walks determined by the coin operator on graphs have been intensively studied. The typical examples of coin operator are the Grover and Fourier matrices. The periodicity of the Grover walk is well investigated. However, the corresponding result ...
- research-articleJanuary 2019
High-dimensional Arnold inverse transformation for multiple images scrambling
International Journal of Computational Science and Engineering (IJCSE), Volume 20, Issue 3Pages 362–375https://doi.org/10.1504/ijcse.2019.103941The traditional scrambling technology based on the low-dimensional Arnold transformation (AT) is not able to assure the security of images during the transmission process, since the key space of the low-dimensional AT is small and the scrambling period is ...
- demonstrationNovember 2018
Periodic stops discovery through density-based trajectory segmentation
SIGSPATIAL '18: Proceedings of the 26th ACM SIGSPATIAL International Conference on Advances in Geographic Information SystemsPages 584–587https://doi.org/10.1145/3274895.3274946Stop-and-move is a popular mobility pattern describing the behavior of an object alternating periods of relative stationarity (stops) with periods of mobility (move). In this demo, we present a system supporting the discovery of periodic stops in ...
- short-paperApril 2018
Hearts and Politics: Metrics for Tracking Biorhythm Changes during Brexit and Trump
DH '18: Proceedings of the 2018 International Conference on Digital HealthPages 111–115https://doi.org/10.1145/3194658.3194678Our internal experience of time reflects what is going in the world around us. Our body»s natural rhythms get disrupted for a variety of external factors, including exposure to collective events. We collect readings of steps, sleep, and heart rates from ...
- research-articleNovember 2017
Finding Periodic Discrete Events in Noisy Streams
CIKM '17: Proceedings of the 2017 ACM on Conference on Information and Knowledge ManagementPages 627–636https://doi.org/10.1145/3132847.3132981Periodic phenomena are ubiquitous, but detecting and predicting periodic events can be difficult in noisy environments. We describe a model of periodic events that covers both idealized and realistic scenarios characterized by multiple kinds of noise. ...
- invited-talkOctober 2017
Insights from Data Analytics Into Our Personal Sensor Data
MMHealth '17: Proceedings of the 2nd International Workshop on Multimedia for Personal Health and Health CarePage 1https://doi.org/10.1145/3132635.3132644Personal sensors are now ubiquitous and they can be wearable, they can be carried or they can be in situ and fixed into our homes or workplaces. The major factors influencing the growth in personal sensing include that they are smaller, smarter, cheaper,...
- research-articleApril 2017
Periodicity in User Engagement with a Search Engine and Its Application to Online Controlled Experiments
ACM Transactions on the Web (TWEB), Volume 11, Issue 2Article No.: 9, Pages 1–35https://doi.org/10.1145/2856822Nowadays, billions of people use the Web in connection with their daily needs. A significant part of these needs are constituted by search tasks that are usually addressed by search engines. Thus, daily search needs result in regular user engagement ...
- short-paperOctober 2016
Modeling and Predicting Popularity Dynamics via an Influence-based Self-Excited Hawkes Process
CIKM '16: Proceedings of the 25th ACM International on Conference on Information and Knowledge ManagementPages 1897–1900https://doi.org/10.1145/2983323.2983868Modeling and predicting the popularity dynamics of individual user generated items on online social networks has important implications in a wide range of areas. The challenge of this problem comes from the inequality of the popularity of content and ...
- research-articleSeptember 2015
Using periodicity intensity to detect long term behaviour change
UbiComp/ISWC'15 Adjunct: Adjunct Proceedings of the 2015 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2015 ACM International Symposium on Wearable ComputersPages 1069–1074https://doi.org/10.1145/2800835.2800962This paper introduces a new way to analyse and visualize quantified-self or lifelog data captured from any lifelogging device over an extended period of time. The mechanism works on the raw, unstructured lifelog data by detecting periodicities, those ...
- short-paperAugust 2015
Sign-Aware Periodicity Metrics of User Engagement for Online Search Quality Evaluation
SIGIR '15: Proceedings of the 38th International ACM SIGIR Conference on Research and Development in Information RetrievalPages 779–782https://doi.org/10.1145/2766462.2767814Modern Internet companies improve evaluation criteria of their data-driven decision-making that is based on online controlled experiments (also known as A/B tests). The amplitude metrics of user engagement are known to be well sensitive to service ...
- research-articleFebruary 2015
Engagement Periodicity in Search Engine Usage: Analysis and its Application to Search Quality Evaluation
WSDM '15: Proceedings of the Eighth ACM International Conference on Web Search and Data MiningPages 27–36https://doi.org/10.1145/2684822.2685318Nowadays, billions of people use the Web in connection with their daily needs. A significant part of the needs are constituted by search tasks that are usually addressed by search engines. Thus, daily search needs result in regular user engagement with ...