scholarly journals Investigating Recommendation Algorithms for Escape Rooms

2019 ◽  
Vol 06 (04) ◽  
pp. 377-388
Author(s):  
Sagi Bazinin ◽  
Guy Shani
Keyword(s):  
Current System ◽  
Recommendation Systems ◽  
Limited Time ◽  
Empirical Comparison ◽  
Recommendation Algorithms ◽  
Puzzle Solving ◽  
Rating Prediction ◽  
A Current

An escape room is a physical puzzle solving game, where participants solve a series of riddles within a limited time to exit a locked room. Escape rooms differ in their theme, environment, and difficulty, and people hence often differ on their preferences over escape rooms. As such, recommendation systems can help people in deciding which room to visit. In this paper, we describe the properties of the escape rooms recommendation problem, with respect to other popular recommendation problems. We describe a dataset of reviews collected within a current system. We provide an empirical comparison between a set of recommendation algorithms over two problems, top-N recommendation and rating prediction. In both cases, a KNN method performed the best.

scholarly journals Novel SDDM Rating Prediction Models for Recommendation Systems

IEEE Access ◽  
2021 ◽  
Vol 9 ◽  
pp. 101197-101206
Author(s):  
Diao Zhou ◽  
Shengnan Hao ◽  
Haiyang Zhang ◽  
Chenxu Dai ◽  
Yongli An ◽  
...  
Keyword(s):  
Prediction Models ◽  
Recommendation Systems ◽  
Rating Prediction

Fault Detection With NURBs-Based Metamodels

2006 ◽  
Author(s):  
Cameron J. Turner ◽  
Abiola M. Ajetunmobi ◽  
Richard H. Crawford
Keyword(s):  
Current System ◽  
Cost Savings ◽  
Operating Conditions ◽  
Engineering Systems ◽  
Brushless Dc Motors ◽  
Brushless Dc ◽  
Dc Motors ◽  
Modern Engineering ◽  
Incipient Faults ◽  
A Current

Developing the ability for a system to self-monitor its condition is a desirable feature in many modern engineering systems. This capability facilitates a maintenance-as-needed rather than a maintenance-as-scheduled paradigm, offering potential efficiency improvements and corresponding cost savings. By using continuously updated Non-Uniform Rational B-spline (NURBs) metamodels of system performance to monitor the system condition, the onset of incipient faults can be detected by comparison to a self-generated as-built system metamodel, providing a basis for determining off-normal operating conditions. This capability is demonstrated for three distinct fault conditions prevalent in brushless DC motors. The results show that this technique can be used to develop an as-built system metamodel, develop a current system model during system operation, and detect the presence of an incipient fault condition despite the compensation provided by a feedback control system.

scholarly journals <i>Swarm</i> field-aligned currents during a severe magnetic storm of September 2017

2019 ◽  
Author(s):  
Renata Lukianova
Keyword(s):  
Magnetic Storm ◽  
Ring Current ◽  
Current System ◽  
Small Scale ◽  
Substantial Fraction ◽  
H Index ◽  
Swarm Satellites ◽  
Scale Field ◽  
Extreme Behavior ◽  
A Current

Abstract. Swarm satellites observations are used to characterize the extreme behavior of large- and small-scale field-aligned currents (FACs) during the severe magnetic storm of September 2017. Evolution of the current intensities and the equatorward displacement of FACs are analyzed while the satellites cross the pre-midnight, pre-noon, dusk and dawn sectors in both hemispheres. The equatorward boundaries of FACs mainly follow the dynamics of ring current (as monitored in terms of the SYM-H index). The minimum latitude of the FAC boundaries is limited to 50° MLat, below which saturation occurs. The FAC densities are very variable and may increase dramatically, especially in the nightside ionosphere during the storm-time substorms. At the peak of substorm, the average FAC densities reach 3 μA/m2, while the quite level is below 0.1 μA/m2. The dawn–dusk asymmetry is manifested in the enhanced dusk-side R2 FACs in both hemispheres. Filamentary high-density structures are always observed confirming that a substantial fraction of R1/R2 FACs is composed of many small-scale currents. In the pre-noon sector, the bipolar structures (7.5 km width FACs of opposite polarities adjacent to each other) dominate, while in the post-midnight sector the upward and downward FACs tend to form more latitudinally extended structures of a certain polarity. The most intense small-scale FACs (up to ~80 μA/m2) is observed just in the post-midnight sector. Simultaneous magnetic and plasma perturbations indicate that this structure is likely a current system of a mesoscale auroral arc.

Constructing Recommendation Systems for Effective Health Messages Using Content, Collaborative, and Hybrid Algorithms

2015 ◽  
Vol 659 (1) ◽  
pp. 290-306 ◽  
Author(s):  
Joseph N. Cappella ◽  
Sijia Yang ◽  
Sungkyoung Lee
Keyword(s):  
Recommendation System ◽  
Recommendation Systems ◽  
Theory Development ◽  
Health Messages ◽  
Recommendation Algorithms ◽  
Public Health Messages ◽  
Message Testing ◽  
Conventional Models ◽  
Content Similarity ◽  
Empirical Approaches

Theoretical and empirical approaches to the design of effective messages to increase healthy and reduce risky behavior have shown only incremental progress. This article explores approaches to the development of a “recommendation system” for archives of public health messages. Recommendation systems are algorithms operating on dense data involving both individual preferences and objective message features. Their goal is to predict ratings for items (i.e., messages) not previously seen by the user on content similarity, prior preference patterns, or their combination. Standard approaches to message testing and research, while making progress, suffer from very slow accumulation of knowledge. This article seeks to leapfrog conventional models of message research, taking advantage of modeling developments in recommendation systems from the commercial arena. After sketching key components in developing recommendation algorithms, this article concludes with reflections on the implications of these approaches in both theory development and application.

scholarly journals DEFORMATION OF ROTATIONAL TIDAL CURRENTS IN SHALLOW COASTAL WATER

1970 ◽  
Vol 1 (12) ◽  
pp. 130
Author(s):  
Harold Gohren
Keyword(s):  
Bottom Sediment ◽  
North Sea ◽  
Coastal Water ◽  
Current System ◽  
Tidal Currents ◽  
Elbe Estuary ◽  
Residual Currents ◽  
A Current

Along gently sloping coasts of seas having rotary tidal currents, the symmetry of the rotary current is interrupted where the water is shallow As a result, residual counter currents are formed The dynamics of such a current system are described based on current measurements in the Elbe Estuary (southeastern North Sea) The residual currents of this area result in the movement of bottom sediment and are most likely responsible for a series of similar appearing morphologic features.

scholarly journals Design of Personalized Recommendation Algorithms based on Big Data Framework

2021 ◽  
Vol 2138 (1) ◽  
pp. 012025
Author(s):  
Fang Liu
Keyword(s):  
Big Data ◽  
Information Overload ◽  
Recommendation Systems ◽  
Recall Rate ◽  
Personalized Recommendation ◽  
Processing Technologies ◽  
Data Framework ◽  
Recommendation Algorithms ◽  
Data Environment ◽  
Better Than

Abstract The issue of information overload has become increasingly prominent since there are various kinds of data generated daily. A good recommendation systems can better deal with such problems. However, traditional recommendation systems for a single machine are suffering from the computing bottleneck in the environment of massive data. An individual recommendation algorithm is unable to gratify desiring users. To tackle this problem, we designed and implemented three kinds of recommendation algorithms based on big data framework in this paper. Besides, we improved the traditional recommendation algorithms leveraging the prevailing big data processing technologies. Finally, we evaluated the efficiency of the algorithm through recall rate, precision rate and coverage. Experiments show that the hybrid model-based recommendation algorithms which can be applied to the bulk data environment are better than the single recommendation algorithms.

scholarly journals News Recommendation Systems in the Era of Information Overload

2021 ◽  
Author(s):  
Shuaishuai Feng ◽  
Junyan Meng ◽  
Jiaxing Zhang
Keyword(s):  
Information Overload ◽  
Recommendation Systems ◽  
Mobile Internet ◽  
Modern World ◽  
The Internet ◽  
The Public ◽  
Recommendation Algorithms ◽  
Cold Starts ◽  
News Recommendation ◽  
Source Of Information

The internet has reconstructed information boundaries in the modern world, and along with mobile internet has become the most important source of information for the public. Simultaneously, the internet has brought humanity into an era of information overload. In response to this information overload, recommendation systems backed by big data and smart algorithms have become highly popular on information platforms on the internet. There have already been many studies that attempted to improve and upgrade recommendation algorithms from a technical perspective, but the field lacks a comprehensive reflection on news recommendation algorithms. In our study, we summarize the principles and characteristics of current news recommendation algorithms and discuss “unexpected consequences” that might arise from these algorithms. In particular, technical bottlenecks include cold starts and data sparsity, and moral bottlenecks are presented in the form of information imbalance and manipulation. These problems may cause new recommendation systems to become a “warped mirror”.

Anodic Polarization Characteristics Of Gold and Silver In Chloride and Sulfate Media

CORROSION ◽  
1963 ◽  
Vol 19 (4) ◽  
pp. 115t-119t ◽  
Author(s):  
F. P. A. ROBINSON ◽  
F. A. FROST
Keyword(s):  
Anodic Polarization ◽  
Current System ◽  
Anodic Polarization Curve ◽  
Chloride Ions ◽  
Passive State ◽  
Anode Reaction ◽  
Polarization Characteristics ◽  
Impressed Current ◽  
The Stability ◽  
A Current

Abstract The anodic polarization characteristics of gold and silver in chloride and sulfate media have been studied, employing potentiostatic techniques. It was found that gold produces an active-passive S-shaped curve, the form of which is not seriously affected by the presence of oxygen in the electrolyte. The stability of the passive state was greater in the sulfate than in the chloride media. Silver does not give a typical anodic polarization curve in NaCl solution, because formation of an AgCl film is the primary anode reaction. This film thickens and exfoliates at a current density of 2 a/sq ft. For this reason, silver could not be used as an inexpendable anode in an impressed current system containing chloride ions.

scholarly journals Using Smart Sensors to Monitor Physical Activity and Technical–Tactical Actions in Junior Tennis Players

2020 ◽  
Vol 17 (3) ◽  
pp. 1068 ◽  
Author(s):  
José María Giménez-Egido ◽  
Enrique Ortega ◽  
Isidro Verdu-Conesa ◽  
Antonio Cejudo ◽  
Gema Torres-Luque
Keyword(s):  
Physical Activity ◽  
Current System ◽  
World Health ◽  
Smart Devices ◽  
Time Data ◽  
Ball Impact ◽  
Tennis Players ◽  
Junior Tennis ◽  
Green Stage ◽  
A Current

The use of smart devices to obtain real-time data has notably increased in the context of training. These technological tools provide data which monitor the external load and technical–tactical actions related to psychological and physical health in junior tennis players. The purpose of this paper is to monitor technical–tactical actions and physical activity during a current tennis competition in the Green stage using a Zepp Tennis Smart Sensor 2. The participants were 20 junior tennis players (under 10 years of age), with an average age of 9.46 years. The total number of strokes (n= 21,477) during 75 matches was analyzed. The study variables were the following aspects: (a) number of strokes, (b) ball impact in the sweet spot; (c) racket speed; (d) ball spin; (e) calories burned; and (f) match time. The current system of competition, based on knockout, does not meet the World Health Organization’s recommendations for daily physical activity time. Players mainly used flat forehands with a lack of variability in technical–tactical actions which did not meet the current learning opportunity criteria of comprehensive methodologies. The competition system in under-11 tennis should be adapted to the players’ characteristics by improving the variability and quantity of practice.

scholarly journals Swarm field-aligned currents during a severe magnetic storm of September 2017

2020 ◽  
Vol 38 (1) ◽  
pp. 191-206
Author(s):  
Renata Lukianova
Keyword(s):  
Magnetic Storm ◽  
Ring Current ◽  
Current System ◽  
Local Times ◽  
Small Scale ◽  
H Index ◽  
Scale Field ◽  
Extreme Behavior ◽  
Swarm Satellite ◽  
A Current

Abstract. Swarm satellite observations are used to characterize the extreme behavior of large- and small-scale field-aligned currents (FACs) during the severe magnetic storm of September 2017. Evolutions of the current intensities and the equatorward displacement of FACs are analyzed while the satellites cross the pre-midnight, pre-noon, dusk and dawn sectors in both hemispheres. The equatorward boundaries of FACs mainly follow the dynamics of the ring current as monitored in terms of the SYM-H index. The minimum latitude of the FAC boundaries is limited to 50∘ magnetic latitude (MLat). The FAC densities are very variable and may increase dramatically, especially in the nightside ionosphere during the storm-time substorms. At the peak of substorms, the average FAC densities reach >3 µA m−2. The dawn–dusk asymmetry is manifested in the enhanced dusk-side R2 FACs in both hemispheres. In the 1 Hz data filamentary high-density structures are always observed. In the pre-noon sector, the bipolar structures (7.5 km width FACs of opposite polarities adjacent to each other) dominate, while at the other local times the upward and downward FACs tend to be latitudinally separated. The most intense small-scale FACs, up to ∼80 µA m−2, are observed just in the post-midnight sector. Simultaneous magnetic and plasma perturbations indicate that this structure is likely a current system of a mesoscale auroral arc.

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