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465 Results Found

  • Article
  • Open Access
10 Citations
4,370 Views
26 Pages

A Stepwise Algorithm for Linearly Combining Biomarkers under Youden Index Maximization

  • Rocío Aznar-Gimeno,
  • Luis M. Esteban,
  • Rafael del-Hoyo-Alonso,
  • Ángel Borque-Fernando and
  • Gerardo Sanz

8 April 2022

Combining multiple biomarkers to provide predictive models with a greater discriminatory ability is a discipline that has received attention in recent years. Choosing the probability threshold that corresponds to the highest combined marker accuracy...

(This article belongs to the Section D1: Probability and Statistics)
  • Article
  • Open Access
13 Citations
4,645 Views
22 Pages

Conditions of the Stepwise Cooling Algorithm for Stable Supercooling Preservation and Freshness of Pork Loin

  • Dong Hyeon Park,
  • Eun Jeong Kim,
  • Honggyun Kim,
  • Geun-Pyo Hong and
  • Mi-Jung Choi

13 December 2022

Supercooling has the advantage of maintaining the freshness of foods without a phase transition. However, it is hard to sustain the supercooled state. Static temperature control, one of the various supercooling technologies, is used for stable superc...

(This article belongs to the Section Meat)
  • Article
  • Open Access
3,232 Views
12 Pages

28 October 2022

Several electrocardiographic algorithms have been proposed to identify the site of origin for the ventricular arrhythmias (VAs) from the left ventricular outflow tract (LVOT) versus right ventricular outflow tract. However, the electrocardiographic c...

(This article belongs to the Special Issue Current Updates on Interventional Cardiac Electrophysiology)
  • Article
  • Open Access
26 Citations
6,521 Views
12 Pages

28 January 2022

Supercooling is the method of lowering the temperature of a foodstuff below its freezing point without phase transitions. This storage technique has a potential advantage for extending shelf life. Nevertheless, the supercooled state of food is thermo...

(This article belongs to the Section Food Engineering and Technology)
  • Article
  • Open Access
20 Citations
1,982 Views
20 Pages

24 May 2015

The aim of this study is to enhance the predictivity power of CoMFA and CoMSIA models by means of different variable selection algorithms. The genetic algorithm (GA), successive projection algorithm (SPA), stepwise multiple linear regression (SW-MLR)...

  • Article
  • Open Access
208 Views
23 Pages

19 September 2026

Wi-Fi fingerprint-based positioning has been widely deployed for indoor localization due to its low deployment cost and good environmental adaptability. Nevertheless, positioning accuracy is significantly degraded by signal interference, redundant ac...

(This article belongs to the Section Computer Science & Engineering)
  • Article
  • Open Access
20 Citations
6,144 Views
16 Pages

An Efficient Hardware Accelerator for the MUSIC Algorithm

  • Hui Chen,
  • Kai Chen,
  • Kaifeng Cheng,
  • Qinyu Chen and ,
  • Yuxiang Fu and
  • Li Li
  • + 1 author+ 0 author

As a classical DOA (direction of arrival) estimation algorithm, the multiple signal classification (MUSIC) algorithm can estimate the direction of signal incidence. A major bottleneck in the application of this algorithm is the large computation amou...

(This article belongs to the Special Issue VLSI Architecture Design for Digital Signal Processing)
  • Article
  • Open Access
25 Citations
7,096 Views
16 Pages

13 July 2021

Predictive maintenance conducts maintenance actions according to the prognostic state of machinery, which can be demonstrated by a model. Due to this characteristic, choosing a proper model for describing the state of machinery is important. Among va...

  • Article
  • Open Access
21 Citations
4,279 Views
24 Pages

In view of the difficulties of fruit cluster identification, the specific harvesting sequence constraints of aggregated fruits, and the balanced harvesting task assignment for the multiple arms with a series-increasing symmetric shared (SISS) region,...

(This article belongs to the Special Issue Robots and Autonomous Machines for Agriculture Production)
  • Protocol
  • Open Access
2 Citations
2,086 Views
16 Pages

A Clinical Probability-Based, Stepwise Algorithm for the Diagnosis of Giant Cell Arteritis: Study Protocol and Baseline Characteristics of the First 50 Patients Included in the Prospective Validation Study with Focus on Cranial Symptoms

  • Lukas-Caspar Thielmann,
  • Melike Findik-Kilinc,
  • Louise Füeßl,
  • Christian Lottspeich and ,
  • Anja Löw,
  • Teresa Henke,
  • Sandra Hasmann,
  • Ilaria Prearo,
  • Amanda von Bismarck and
  • Michael Czihal
  • + 15 authors+ 10 authors

26 March 2025

Background: Early diagnosis of giant cell arteritis (GCA) is crucial to avoid loss of vision, but detailed headache characteristics of GCA have been poorly studied. Clinical prediction rules have shown promise in guiding management decisions in suspe...

(This article belongs to the Section Clinical Research Methods)
  • Article
  • Open Access
72 Citations
14,156 Views
18 Pages

Machine Learning-Enabled Smart Industrial Automation Systems Using Internet of Things

  • Ali M. Al Shahrani,
  • Madani Abdu Alomar,
  • Khaled N. Alqahtani,
  • Mohammed Salem Basingab and ,
  • Bhisham Sharma and
  • Ali Rizwan
  • + 1 author+ 0 author

28 December 2022

Industrial automation uses robotics and software to operate equipment and procedures across industries. Many applications integrate IoT, machine learning, and other technologies to provide smart features that improve the user experience. The use of s...

(This article belongs to the Special Issue Emerging Sensor Communication Network-Based AI/ML Driven Intelligent IoT)
  • Article
  • Open Access
11 Citations
4,321 Views
20 Pages

21 July 2021

In this paper a Bayesian method is proposed to estimate dynamic origin–destination (O–D) demand. The proposed method can synthesize multiple sources of data collected by various sensors, including link counts, turning movements at intersections, flow...

(This article belongs to the Topic Intelligent Transportation Systems)
  • Article
  • Open Access
40 Citations
5,690 Views
28 Pages

Combining Thermal and RGB Imaging Indices with Multivariate and Data-Driven Modeling to Estimate the Growth, Water Status, and Yield of Potato under Different Drip Irrigation Regimes

  • Salah Elsayed,
  • Salah El-Hendawy,
  • Mosaad Khadr,
  • Osama Elsherbiny and ,
  • Nasser Al-Suhaibani,
  • Majed Alotaibi,
  • Muhammad Usman Tahir and
  • Waleed Darwish
  • + 3 authors+ 0 author

27 April 2021

Advances in proximal hyperspectral sensing tools, chemometric techniques, and data-driven modeling have enhanced precision irrigation management by facilitating the monitoring of several plant traits. This study investigated the performance of remote...

(This article belongs to the Special Issue Hyperspectral Remote Sensing of Vegetation Functions)
  • Article
  • Open Access
3 Citations
2,190 Views
13 Pages

Prediction Technology of a Reservoir Development Model While Drilling Based on Machine Learning and Its Application

  • Xin Wang,
  • Min Mao,
  • Yi Yang,
  • Shengbin Yuan and ,
  • Mingyu Guo,
  • Hongru Li,
  • Leli Cheng,
  • Heng Wang and
  • Xiaobin Ye
  • + 4 authors+ 0 author

10 May 2024

In order to further understand the complex spatial distribution caused by the extremely strong heterogeneity of buried hill reservoirs, this paper proposes a new method for predicting the development pattern of buried hill reservoirs based on the tra...

(This article belongs to the Special Issue Quantitative Evaluation, Efficient Development, Seepage, and Simulation of Geo-Energy Resources)
  • Article
  • Open Access
10 Citations
3,738 Views
23 Pages

A Data-Driven Approach for the Ultra-Supercritical Boiler Combustion Optimization Considering Ambient Temperature Variation: A Case Study in China

  • Zhi Wang,
  • Guojia Yao,
  • Wenyuan Xue,
  • Shengxian Cao and ,
  • Shiming Xu and
  • Xianyong Peng
  • + 1 author+ 0 author

30 September 2023

To reduce coal consumption, nitrogen oxide (NOx), and carbon emissions for coal-fired units, combustion optimization has become not only a hot issue for scientists but also a practical engineering for engineers. A data-driven multiple linear regressi...

(This article belongs to the Topic Advanced Operation, Control, and Planning of Intelligent Energy Systems)
  • Article
  • Open Access
1 Citations
1,674 Views
30 Pages

Step-Wise Parameter Adaptive FMD Incorporating Clustering Algorithm in Rolling Bearing Compound Fault Diagnosis

  • Shuai Xu,
  • Chao Zhang,
  • Jing Zhang,
  • Guiyi Liu and ,
  • Yangbiao Wu and
  • Bing Ouyang
  • + 1 author+ 0 author

18 December 2024

Ideally, the vibration signal of a rolling bearing should be symmetrical. However, in practical operation, the vibration signals in both time and frequency domains often exhibit asymmetry due to factors such as load, speed, and wear. The relatively w...

(This article belongs to the Section F: Engineering and Materials)
  • Article
  • Open Access
108 Citations
10,515 Views
18 Pages

26 October 2018

Flash-flood forecasting has emerged worldwide due to the catastrophic socio-economic impacts this hazard might cause and the expected increase of its frequency in the future. In mountain catchments, precipitation-runoff forecasts are limited by the i...

(This article belongs to the Special Issue Flood Forecasting Using Machine Learning Methods)
  • Article
  • Open Access
10 Citations
4,164 Views
18 Pages

22 January 2023

Freezing raw laver is unsuitable for the laver industry due to process characteristics and economic problems. Therefore, this study attempted to investigate supercooled storage to extend the storage period without freezing, rather than refrigeration....

(This article belongs to the Section Foods of Marine Origin)
  • Article
  • Open Access
11 Citations
3,523 Views
23 Pages

26 June 2023

This study investigates the impact of precipitation on Middle Eastern countries like Iran using precise methods such as stable isotope techniques. Stable isotope data for precipitation in Tehran were obtained from the Global Network of Isotopes in Pr...

(This article belongs to the Special Issue The Use of Environmental Isotopes in Hydrogeology)
  • Article
  • Open Access
655 Views
15 Pages

Deterministic Step-by-Step Control of Solar Generation Imbalances in Power Systems

  • Artur Zaporozhets,
  • Vitalii Babak,
  • Mykhailo Kulyk and
  • Viktor Denysov

8 May 2026

This paper examines an algorithm and evaluates the upper limits of technical parameters for step-by-step management of forecast coverage for aggregated generation from solar power plants (SPPs) in Ukraine, given the high share of renewable energy sou...

(This article belongs to the Section Solar Energy Systems and Integration)
  • Article
  • Open Access
11 Citations
5,361 Views
17 Pages

13 August 2018

Harmful algal blooms (HABs) occur frequently in the Seto Inland Sea, bringing significant economic and environmental losses for the area, which is well known as one of the world’s most productive fisheries. Our objective was to develop a quanti...

(This article belongs to the Section Remote Sensors)
  • Article
  • Open Access
54 Citations
13,062 Views
22 Pages

31 March 2021

This paper proposes different classification algorithms—logistic regression, support vector machine, K-nearest neighbors, and random forest—in order to identify which candidates are likely to default for a credit scoring model. Three different featur...

(This article belongs to the Special Issue Mathematics and Mathematical Physics Applied to Financial Markets)
  • Article
  • Open Access
2 Citations
3,281 Views
17 Pages

19 September 2023

The carousel greedy algorithm (CG) was proposed several years ago as a generalized greedy algorithm. In this paper, we implement CG to solve linear regression problems with a cardinality constraint on the number of features. More specifically, we int...

(This article belongs to the Special Issue Bio-Inspired Algorithms)
  • Article
  • Open Access
14 Citations
5,011 Views
23 Pages

Stepwise Fusion of Hyperspectral, Multispectral and Panchromatic Images with Spectral Grouping Strategy: A Comparative Study Using GF5 and GF1 Images

  • Leping Huang,
  • Zhongwen Hu,
  • Xin Luo,
  • Qian Zhang and ,
  • Jingzhe Wang and
  • Guofeng Wu
  • + 1 author+ 0 author

20 February 2022

Since hyperspectral satellite images (HSIs) usually hold low spatial resolution, improving the spatial resolution of hyperspectral imaging (HSI) is an effective solution to explore its potential for remote sensing applications, such as land cover map...

(This article belongs to the Special Issue Multisource Remote Sensing for Coastal Mapping, Monitoring, and Applications)
  • Article
  • Open Access
3 Citations
7,975 Views
11 Pages

Transdermal delivery of certain drugs is challenging because of skin barrier resistance. This study focuses on the implementation of feature-selection algorithms to design chemical penetration enhancers. A database, consisting of 145 polar and nonpol...

  • Article
  • Open Access
7 Citations
2,346 Views
22 Pages

Spectral Clustering Effect in Software Development Effort Estimation

  • Petr Silhavy,
  • Radek Silhavy and
  • Zdenka Prokopova

8 November 2021

Software development effort estimation is essential for software project planning and management. In this study, we present a spectral clustering algorithm based on symmetric matrixes as an option for data processing. It is expected that constructing...

  • Article
  • Open Access
1 Citations
2,941 Views
75 Pages

Complete Subhedge Projection for Stepwise Hedge Automata

  • Antonio Al Serhali and
  • Joachim Niehren

2 August 2024

We demonstrate how to evaluate stepwise hedge automata (Shas) with subhedge projection while completely projecting irrelevant subhedges. Since this requires passing finite state information top-down, we introduce the notion of downward stepwise hedge...

  • Article
  • Open Access
8 Citations
3,722 Views
15 Pages

Beamforming Optimization for Intelligent Reflecting Surface-Assisted MIMO Systems

  • Wenjuan Zhang,
  • Honggui Deng,
  • Youzhen Li,
  • Zaoxing Zhu and ,
  • Chengzuo Peng and
  • Gang Liu
  • + 1 author+ 0 author

23 July 2022

To improve the spectral efficiency of symmetry-based intelligent reconfigurable surface (IRS)-assisted MIMO communication systems, this paper investigates the joint precoding and passive beamforming optimization problem for millimeter-wave point-to-p...

(This article belongs to the Special Issue Symmetry/Asymmetry in Wireless Communication and Sensor Networks)
  • Article
  • Open Access
3 Citations
1,543 Views
22 Pages

10 March 2025

Electric vehicle technologies present promising solutions for achieving energy conservation and emission reduction goals. However, efficiently distributing power across hybrid energy storage systems (HESSs) remains a major challenge in enhancing over...

(This article belongs to the Special Issue Motor Vehicles Energy Management)
  • Article
  • Open Access
1 Citations
2,174 Views
15 Pages

Automatic Variable Selection Algorithms in Prognostic Factor Research in Neck Pain

  • Bernard X. W. Liew,
  • Francisco M. Kovacs,
  • David Rügamer and
  • Ana Royuela

27 September 2023

This study aims to compare the variable selection strategies of different machine learning (ML) and statistical algorithms in the prognosis of neck pain (NP) recovery. A total of 3001 participants with NP were included. Three dichotomous outcomes of...

(This article belongs to the Special Issue Clinical Advances in Musculoskeletal Disorders)
  • Article
  • Open Access
1 Citations
847 Views
23 Pages

13 March 2026

Plane segmentation of real-world 3D point clouds captured by LiDAR or depth sensors remains challenging due to data sparsity, noise, and complex geometric configurations such as stepwise and intersecting non-coplanar structures. To address these issu...

(This article belongs to the Special Issue Intelligent Point Cloud Processing, Sensing and Understanding—Third Edition)
  • Article
  • Open Access
8 Citations
2,723 Views
18 Pages

23 February 2023

Precise tree inventory plays a critical role in sustainable forest planting, restoration, and management. LiDAR-based individual tree detection algorithms often focus on finding individual treetops to discern tree positions. However, deliquescent tre...

(This article belongs to the Special Issue Recent Advancements in High Resolution Remote Sensing for Precision Forestry)
  • Article
  • Open Access
1 Citations
612 Views
9 Pages

Introduction. Results from single medical centers having large numbers of patients with multiple colonic polyps that have undergone colonoscopy management are rare. Material and method. The present study is based on 2000 cases enrolled during 2009 an...

  • Article
  • Open Access
27 Citations
6,556 Views
30 Pages

18 March 2022

Timely, accurate estimates of forest aboveground carbon density (AGC) are essential for understanding the global carbon cycle and providing crucial reference information for climate-change-related policies. To date, airborne LiDAR has been considered...

(This article belongs to the Special Issue Monitoring Forest Carbon Sequestration with Remote Sensing)
  • Review
  • Open Access
3 Citations
4,741 Views
16 Pages

4 August 2022

In recent years, new interest is growing in the left atrium (LA). LA functional analysis and measurement have an essential role in cardiac function evaluation. Left atrial size and function are key elements during the noninvasive analysis of diastoli...

(This article belongs to the Special Issue New Advances in Cardiac Imaging)
  • Article
  • Open Access
5 Citations
2,417 Views
19 Pages

5 August 2022

One of the key tools in an organization’s performance management is the goal tree, which is used for solving both direct and inverse problems. This research deals with goal setting based on a model of the future by presenting the goal and subgo...

(This article belongs to the Special Issue Mathematical Methods and Analysis for the Industrial Management and Business, 2nd Edition)
  • Article
  • Open Access
17 Citations
6,537 Views
15 Pages

DiamondTorre Algorithm for High-Performance Wave Modeling

  • Vadim Levchenko,
  • Anastasia Perepelkina and
  • Andrey Zakirov

Effective algorithms of physical media numerical modeling problems’ solution are discussed. The computation rate of such problems is limited by memory bandwidth if implemented with traditional algorithms. The numerical solution of the wave equation i...

(This article belongs to the Section Computational Engineering)
  • Article
  • Open Access
4 Citations
2,583 Views
14 Pages

Retrieval of Road Surface (Bridge Deck) Temperature near 0 °C Based on Random Forest Model

  • Chuanhui Wang,
  • Beixi Jia,
  • Jianping Zhou,
  • Lei Feng and
  • Jian Chen

13 September 2022

Based on the road surface (bridge deck) temperature, relative humidity, air temperature, wind speed and precipitation observed at two road surface meteorological stations and two bridge deck meteorological stations, as well as subsurface temperature...

(This article belongs to the Special Issue Characteristics and Attribution of Air Temperature Variability)
  • Article
  • Open Access
3 Citations
2,037 Views
29 Pages

Optimizing Water-Light Complementary Systems for the Complex Terrain of the Southwestern China Plateau Region: A Two-Layer Model Approach

  • Zhikai Hu,
  • Zhumei Luo,
  • Na Luo,
  • Xiaoxv Zhang and ,
  • Haocheng Chao and
  • Linsheng Dai
  • + 1 author+ 0 author

28 December 2023

This study aimed to optimize the real-time, short-term dispatch of water-light complementary systems in plateau areas. A two-layer nested improved particle swarm optimization-stepwise optimization algorithm trial (IPSO-SOAT) model was devised to addr...

(This article belongs to the Special Issue Energy Storage and Integration of Renewable Energy Systems towards Energy Sustainability)
  • Article
  • Open Access
3 Citations
1,742 Views
15 Pages

A Comparison of Machine Learning-Based Models and a Simple Clinical Bedside Tool to Predict Morbidity and Mortality After Gastrointestinal Cancer Surgery in the Elderly

  • Barbara Frezza,
  • Mario Cesare Nurchis,
  • Gabriella Teresa Capolupo,
  • Filippo Carannante and ,
  • Marco De Prizio,
  • Fabio Rondelli,
  • Danilo Alunni Fegatelli,
  • Alessio Gili,
  • Luca Lepre and
  • Gianluca Costa
  • + 5 authors+ 0 author

Frailty in the elderly population is associated with increased vulnerability to stressors, including surgical interventions. This study compared machine learning (ML) models with a clinical bedside tool, the Gastrointestinal Surgery Frailty Index (Gi...

(This article belongs to the Special Issue Medical Artificial Intelligence and Data Analysis)
  • Article
  • Open Access
2 Citations
3,573 Views
20 Pages

Development and Assessment of Seasonal Rainfall Forecasting Models for the Bani and the Senegal Basins by Identifying the Best Predictive Teleconnection

  • Luis Balcázar,
  • Khalidou M. Bâ,
  • Carlos Díaz-Delgado,
  • Miguel A. Gómez-Albores and ,
  • Gabriel Gaona and
  • Saula Minga-León
  • + 1 author+ 0 author

19 December 2022

The high variability of rainfall in the Sahel region causes droughts and floods that affect millions of people every year. Several rainfall forecasting models have been proposed, but the results still need to be improved. In this study, linear, polyn...

  • Article
  • Open Access
1 Citations
319 Views
21 Pages

Time-Varying Equivalent Power Source Modeling for High Penetration Renewable-Rich Grids

  • Weibiao Xiong,
  • Zhongmin Sun,
  • Yang Liao,
  • Jianfeng Liu and
  • Pengyuan Chen

1 July 2026

The output responses of renewable energy sources differ significantly from those of a synchronous generator during disturbances. Therefore, an accurate and adaptable equivalent model is urgently needed for power system analysis in modern renewable-ri...

(This article belongs to the Special Issue Advanced in Modeling, Analysis and Control of Microgrids)
  • Article
  • Open Access
30 Citations
4,215 Views
21 Pages

In this paper, we present the results of the research concerning extraction of informative gene expression profiles from high-dimensional array of gene expressions considering the state of patients’ health using clustering method, ML-based bina...

(This article belongs to the Section Machine Learning and Artificial Intelligence in Diagnostics)
  • Article
  • Open Access
3 Citations
3,922 Views
21 Pages

10 June 2019

To support high-level wind energy utilization, wind power prediction has become a more and more attractive topic. To improve prediction accuracy and flexibility, joint point-interval prediction of wind power via a stepwise procedure is studied in thi...

  • Article
  • Open Access
6 Citations
3,440 Views
16 Pages

10 January 2021

Spatial-frequency domain imaging (SFDI) is a wide-field, noncontact, and label-free imaging modality that is currently being explored as a new means for estimating optical absorption and scattering properties of two-layered turbid materials. The accu...

(This article belongs to the Section Food Science and Technology)
  • Article
  • Open Access
529 Views
13 Pages

Plating of a Single Bone Is Promising for the Treatment of Both-Bone Forearm Fractures in Children

  • Shou En Cheng,
  • Kai Xuan Lim,
  • Shang-Ming Lin,
  • Ching-Ting Liang and
  • Tsung-Yu Lan

10 June 2026

Background: Forearm fractures involving both bones are common orthopedic injuries. Children have a higher tolerance for greater displacement and angulation owing to the remodeling potential. The optimal fixation method for managing pediatric forearm...

(This article belongs to the Special Issue New Challenges in Fracture Management)
  • Feature Paper
  • Article
  • Open Access
28 Citations
7,357 Views
13 Pages

Condition Monitoring of Drive Trains by Data Fusion of Acoustic Emission and Vibration Sensors

  • Oliver Mey,
  • André Schneider,
  • Olaf Enge-Rosenblatt,
  • Dirk Mayer and ,
  • Christian Schmidt,
  • Samuel Klein and
  • Hans-Georg Herrmann
  • + 2 authors+ 0 author

25 June 2021

Early damage detection and classification by condition monitoring systems is crucial to enable predictive maintenance of manufacturing systems and industrial facilities. Data analysis can be improved by applying machine learning algorithms and fusion...

(This article belongs to the Special Issue Process Control and Smart Manufacturing for Industry 4.0)
  • Article
  • Open Access
1 Citations
2,421 Views
11 Pages

How to Assess Different Algorithms Using Intuitionistic Fuzzy Logic

  • Tania Pencheva,
  • Maria Angelova,
  • Evdokia Sotirova and
  • Krassimir Atanassov

7 September 2021

Intuitionistic fuzzy logic is the main tool in the recently developed step-wise “cross-evaluation” procedure that aims at the assessment of different optimization algorithms. In this investigation, the procedure previously applied to compare the effe...

(This article belongs to the Special Issue Intuitionistic Fuzzy Sets and Applications)
  • Article
  • Open Access
1 Citations
3,467 Views
11 Pages

Evaluating the Diagnostic Accuracy of a Novel Bayesian Decision-Making Algorithm for Vision Loss

  • Amy Basilious,
  • Chris N. Govas,
  • Alexander M. Deans,
  • Pradeepa Yoganathan and
  • Robin M. Deans

4 April 2022

The current diagnostic aids for acute vision loss are static flowcharts that do not provide dynamic, stepwise workups. We tested the diagnostic accuracy of a novel dynamic Bayesian algorithm for acute vision loss. Seventy-nine “participants&rdq...

  • Article
  • Open Access
2,682 Views
11 Pages

24 October 2022

The current diagnostic aids for red eye are static flowcharts that do not provide dynamic, stepwise workups. The diagnostic accuracy of a novel dynamic Bayesian algorithm for red eye was tested. Fifty-seven patients with red eye were evaluated by an...

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