Herding Effect based Attention for Personalized Time-Sync Video Recommendation

Time-sync comment (TSC) is a new form of user-interaction review associated with real-time video contents, which contains a user's preferences for videos and therefore well suited as the data source for video recommendations. However, existing review-based recommendation methods ignore the context-dependent (generated by user-interaction), real-time, and time-sensitive properties of TSC data. To bridge the above gaps, in this paper, we use video images and users' TSCs to design an Image-Text Fusion model with a novel Herding Effect Attention mechanism (called ITF-HEA), which can predict users' favorite videos with model-based collaborative filtering. Specifically, in the HEA mechanism, we weight the context information based on the semantic similarities and time intervals between each TSC and its context, thereby considering influences of the herding effect in the model. Experiments show that ITF-HEA is on average 3.78\% higher than the state-of-the-art method upon F1-score in baselines.Comment: ACCEPTED for ORAL presentation at IEEE ICME 201

高強度TRIP型ベイニティックフェライト鋼の微細組織形成と水素脆化挙動

Tohoku University秋山英二課

Energy Star Lighting Verification Program Semi-Annual Report

The Program for the Evaluation and Analysis of Residential Lighting (PEARL) is a watchdog program. It was created in response to complaints received by utility program managers about the performance of certain Energy Star lighting products being promoted within their service territories and the lack of a self-policing mechanism within the lighting industry that would ensure the reliability of these products and their compliance with ENERGY STAR specifications. To remedy these problems, PEARL purchases and tests products that are available to the consumers in the marketplace. The Lighting Research Center (LRC) tests the selected products against the corresponding Energy Star specifications. This report includes the experimental procedure of Cycle 7 of PEARL program during the period of October 2005 to March 2006, along with the description of apparatus used, equipment calibration process, experimental methodology, and research findings from the testing. LRC administered the purchasing of CFL samples to test in Cycle 7, performed 100-hour seasoning for most of the CFL samples received by March 2006, and performed sphere testing for some of the CFL samples at 100 hours of life (initial measurement)

Energy Star Lighting Verification Program (Program for the Evaluation and Analysis of Residential Lighting)

The Program for the Evaluation and Analysis of Residential Lighting (PEARL) is a watchdog program. It was created in response to complaints received by utility program managers about the performance of certain Energy Star lighting products being promoted within their service territories and the lack of a self-policing mechanism within the lighting industry that would ensure the reliability of these products and their compliance with ENERGY STAR specifications. To remedy these problems, PEARL purchases and tests products that are available to the consumers in the marketplace. The Lighting Research Center (LRC) tests the selected products against the corresponding Energy Star specifications. This final report summarizes the experimental procedure and results of all cycles (Cycles 1 through 8) of PEARL program from the beginning of year 2000 to the end of 2007, along with the description of apparatus used, equipment calibration process, experimental methodology, and research findings from the testing. In each cycle of PEARL program, PEARL Board selects a list of Compact Fluorescent Lamp (CFL) and Residential Lighting Fixture (RLF) models that are Energy Star qualified. In Cycle 5, Cycle 7, and Cycle 8, no fixture models were selected. After that PEARL sponsors procure product samples for each selected model from different stores and locations in the retail market and send them to LRC for testing. LRC then receive and select the samples, and test them against Energy Star specifications. After the testing LRC analyze and report the results to PEARL Board. Totally 185 models of CFL and 52 models of RLF were tested in PEARL program. Along with the evolution of the Energy Star specifications from year 2000 to 2003, parameters that were required by Energy Star changed during the eight years of PEARL program. The testing parameters and number of samples tested in PEARL program also changed during this time. For example, in Cycle 1, three samples of each models were tested for their photometric and electrical parameters only; in Cycle 2, 1000-hour Lumen Maintenance and the Rapid Cycle Stress Test was added and an additional set of six samples of each models were tested for Rapid Cycle Stress Test. Also, Cycle 2 data analysis included the testing and verification results against both the 'then existing' specification dated 2000 and the 'then new' specification dated 8/9/2001. In Cycle 3, Lumen Maintenance at 40% life was added and the number of samples for photometric and electrical testing was increased to five. In Cycle 6, the number of samples for photometric and electrical testing increased again to ten so that five of them were tested in base-up position and five in base-down position. A total of 2375 CFL samples were tested in PEARL program, out of the more than 3000 CFL samples that were purchased for the testing purpose of this program

Quantum Multicritical Behavior for Coupled Optical Cavities with Driven Laser Fields

Quantum phase transitions with multicritical points are fascinating phenomena occurring in interacting quantum many-body systems. However, multicritical points predicted by theory have been rarely verified experimentally; finding multicritical points with specific behaviors and realizing their control remains a challenging topic. Here, we propose a system that a quantized light field interacts with a two-level atomic ensemble coupled by microwave fields in optical cavities, which is described by a generalized Dicke model. Multicritical points for the superradiant quantum phase transition are shown to occur. We determine the number and position of these critical points and demonstrate that they can be effectively manipulated through the tuning of system parameters. Particularly, we find that the quantum critical points can evolve into a Lifshitz point if the Rabi frequency of the light field is modulated periodically in time. Remarkably, the texture of atomic pseudo-spins can be used to characterize the quantum critical behaviors of the system. The magnetic orders of the three phases around the Lifshitz point, represented by the atomic pseudo-spins, are similar to those of an axial next-nearest-neighboring Ising model. The results reported here are beneficial for unveiling intriguing physics of quantum phase transitions and pave the way towards to find novel quantum multicritical phenomena based on the generalized Dicke model