scholarly journals Visual Performance Evaluation Study of Wayfinding Factors in Subway Transfer Station - Focus on the Sadang Subway Station, Seoul Subway Station, Jongro3-ga Subway Station and Gongduck Subway Station -

2013 ◽  
Vol 22 (4) ◽  
pp. 167-177 ◽  
Author(s):  
Hyeon-Ji Song ◽  
Nam-Hyo Kim
Keyword(s):  
Performance Evaluation ◽  
Evaluation Study ◽  
Visual Performance ◽  
Subway Station ◽  
Transfer Station

Performance Evaluation of Distributed Database Systems

2014 ◽  
Vol 13 (9) ◽  
pp. 4859-4867
Author(s):  
Khaled Saleh Maabreh
Keyword(s):  
Performance Evaluation ◽  
System Performance ◽  
Operation Mode ◽  
Database Systems ◽  
Distributed Database ◽  
Evaluation Study ◽  
Distributed Database Systems ◽  
Different Types ◽  
Distributed Database System ◽  
Distributed Database Management

Distributed database management systems manage a huge amount of data as well as large and increasingly growing number of users through different types of queries. Therefore, efficient methods for accessing these data volumes will be required to provide a high and an acceptable level of system performance.  Data in these systems are varying in terms of types from texts to images, audios and videos that must be available through an optimized level of replication. Distributed database systems have many parameters like data distribution degree, operation mode and the number of sites and replication. These parameters have played a major role in any performance evaluation study. This paper investigates the main parameters that may affect the system performance, which may help with configuring the distributed database system for enhancing the overall system performance.

scholarly journals Clinical performance evaluation of SARS-CoV-2 rapid antigen testing in point of care usage in comparison to RT-qPCR

2021 ◽  
Author(s):  
Isabell Wagenhaeuser ◽  
Kerstin Knies ◽  
Vera Rauschenberger ◽  
Michael Eisenmann ◽  
Miriam McDonogh ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Viral Load ◽  
Clinical Performance ◽  
Point Of Care ◽  
Hospital Setting ◽  
High Viral Load ◽  
Evaluation Study ◽  
Study Cohort ◽  
Protein Variant ◽  
Atypical Symptoms

Background Antigen rapid diagnostic tests (RDT) for SARS-CoV-2 are fast, broadly available, and inexpensive. Despite this, reliable clinical performance data is sparse. Methods In a prospective performance evaluation study, RDT from three manufacturers (NADAL, Panbio, MEDsan) were compared to quantitative reverse transcription polymerase chain reaction (RT-qPCR) in 5 068 oropharyngeal swabs for detection of SARS-CoV-2 in a hospital setting. Viral load was derived from standardized RT-qPCR Cycle threshold (Ct) values. The data collection period ranged from November 12, 2020 to February 28, 2021. Findings Overall, sensitivity of RDT compared to RT-qPCR was 42.57% (95% CI 33.38%-52.31%), and specificity 99.68% (95% CI 99.48%-99.80%). Sensitivity declined with decreasing viral load from 100% in samples with a deduced viral load of 10^8 SARS-CoV-2 RNA copies per ml to 8.82% in samples with a viral load lower than 104 SARS-CoV-2 RNA copies per ml. No significant differences in sensitivity or specificity could be observed between the three manufacturers, or between samples with and without spike protein variant B.1.1.7. The NPV in the study cohort was 98.84%; the PPV in persons with typical COVID-19 symptoms was 97.37%, and 28.57% in persons without or with atypical symptoms. Interpretation RDT are a reliable method to diagnose SARS-CoV-2 infection in persons with high viral load. RDT are a valuable addition to RT-qPCR testing, as they reliably detect infectious persons with high viral loads before RT-qPCR results are available. Funding German Federal Ministry for Education and Science (BMBF), Free State of Bavaria

DMA

2013 ◽  
Vol 9 (4) ◽  
pp. 62-75 ◽  
Author(s):  
Damla Oguz ◽  
Baris Yildiz ◽  
Belgin Ergenc
Keyword(s):  
Performance Evaluation ◽  
Evaluation Study ◽  
Frequent Itemsets ◽  
Current Work ◽  
Apriori Algorithm ◽  
Itemset Mining ◽  
Support Threshold ◽  
Benchmark Datasets ◽  
Mining Algorithms

Updates on an operational database bring forth the challenge of keeping the frequent itemsets up-to-date without re-running the itemset mining algorithms. Studies on dynamic itemset mining, which is the solution to such an update problem, have to address some challenges as handling i) updates without re-running the base algorithm, ii) changes in the support threshold, iii) new items and iv) additions/deletions in updates. The study in this paper is the extension of the Incremental Matrix Apriori Algorithm which proposes solutions to the first three challenges besides inheriting the advantages of the base algorithm which works without candidate generation. In the authors' current work, the authors have improved a former algorithm as to handle updates that are composed of additions and deletions. The authors have also carried out a detailed performance evaluation study on a real and two benchmark datasets.

Is Node.js a viable option for building modern web applications? A performance evaluation study

Computing ◽  
2014 ◽  
Vol 97 (10) ◽  
pp. 1023-1044 ◽  
Author(s):  
Ioannis K. Chaniotis ◽  
Kyriakos-Ioannis D. Kyriakou ◽  
Nikolaos D. Tselikas
Keyword(s):  
Performance Evaluation ◽  
Web Applications ◽  
Evaluation Study ◽  
Viable Option ◽  
A Performance

scholarly journals Point-of-Care Test for Detection of Urogenital Chlamydia in Women Shows Low Sensitivity. A Performance Evaluation Study in Two Clinics in Suriname

PLoS ONE ◽  
2012 ◽  
Vol 7 (2) ◽  
pp. e32122 ◽  
Author(s):  
Jannie J. van der Helm ◽  
Leslie O. A. Sabajo ◽  
Antoon W. Grunberg ◽  
Servaas A. Morré ◽  
Arjen G. C. L. Speksnijder ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Point Of Care ◽  
Evaluation Study ◽  
Point Of Care Test ◽  
Low Sensitivity ◽  
A Performance
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