Research on Multi-Point Calibration and Touch Pressure of Touch-Screen

2012 ◽  
Vol 198-199 ◽  
pp. 1290-1293 ◽  
Author(s):  
Xiu Hong Jiang ◽  
Fu Hai Duan ◽  
Rui Guo
Keyword(s):  
Touch Screen ◽  
Test Results ◽  
Pressure Threshold ◽  
Calibration Algorithm ◽  
Point Set ◽  
Two Measures ◽  
Target Environment ◽  
Low Sensitivity ◽  
Coordinate Conversion ◽  
Calibration Coefficients

In view of the inaccuracy and low sensitivity of resistive touch-screen in small point target environment, two measures were proposed. First, based on the existing three-point calibration algorithm, more points were sampled to improve coordinate conversion precision, greedy algorithmm reduced the random calibration point set, and least squares algorithm fit the final calibration coefficients. Another measure was to utilize the touch pressure measurement and pressure threshold decision to remove invalid click. Finally, test results show that multi-point calibration with greedy algorithm can improve the precision of coordinate calibration, and the adoption of pressure decision can effectively enhance the system’s adaptability to touch intensity.

Improvements of Infrared Touch Screen Calibration Algorithm Based on Affine Transformation

2014 ◽  
Vol 716-717 ◽  
pp. 1341-1345
Author(s):  
Wen Ming Guo ◽  
Gang Wang
Keyword(s):  
Affine Transformation ◽  
Touch Screen ◽  
The Other ◽  
Pass Rate ◽  
Sample Point ◽  
Affine Transform ◽  
Calibration Algorithm ◽  
Windows 8

Because the affine transformation can realize the coordinate translation, rotation, scaling, it is applied to calibrate the touch screen. But,requirements for touch errors of Windows 8 is ±0.5mm,and the pass rate of sample point must reach 4%.Therefore, simply use the method of draw-point to collect the sample point has been unable to meet the requirement of accuracy. This paper tries to propose two improved calibration algorithm based on affine transform, one method use drawing lines instead of marking point, the other devides the screen into a plurality of areas to use multiple calibration. This two kind of methods can effectively improve the calibration precision.

scholarly journals A diagnostic test for heparin-induced thrombocytopenia

Blood ◽  
1986 ◽  
Vol 67 (1) ◽  
pp. 27-30 ◽  
Author(s):  
D Sheridan ◽  
C Carter ◽  
JG Kelton
Keyword(s):  
High Specificity ◽  
Heparin Therapy ◽  
Positive Test ◽  
Test Results ◽  
Specific Test ◽  
Heparin Induced Thrombocytopenia ◽  
Platelet Release ◽  
High Concentrations ◽  
Low Sensitivity ◽  
Test Result

Heparin-induced thrombocytopenia can be a serious and difficult-to- diagnose complication of heparin therapy. Serum from patients with heparin-induced thrombocytopenia can cause heparin-dependent platelet aggregation, but the low sensitivity and specificity of this test limit its clinical usefulness. In this report we describe an assay for heparin-induced thrombocytopenia that is both sensitive and specific. The improvement in the assay was accomplished by measuring platelet release instead of aggregation and by measuring platelet release at two heparin concentrations. The rationale for the use of two heparin concentrations was that sera from patients with heparin-induced thrombocytopenia caused release at therapeutic but not at high concentrations of heparin. Twenty-eight sera samples from patients suspected of having heparin-induced thrombocytopenia and 573 controls were coded and tested in the assay. The patients with possible heparin- induced thrombocytopenia were ranked according to the likelihood of having this disorder by using prospectively defined criteria. The test had a high specificity (99%); only one of 573 controls showed a positive result. The test was also very sensitive, and the likelihood of a positive test result was directly correlated with the clinical likelihood of the patient having heparin-induced thrombocytopenia. Six of six patients with definitive heparin-induced thrombocytopenia had positive test results, whereas zero of four patients in whom the diagnosis was unlikely had positive test results. The two-point test for heparin-induced thrombocytopenia represents a sensitive and specific test for this disorder. This test may be useful not only in confirming the diagnosis of this disorder but also may provide information about its pathogenesis.

scholarly journals Low Sensitivity of BinaxNOW RSV in Infants

2020 ◽  
Vol 222 (Supplement_7) ◽  
pp. S640-S647 ◽  
Author(s):  
Roy P Zuurbier ◽  
Louis J Bont ◽  
Annefleur C Langedijk ◽  
Mirjam Hamer ◽  
Koos Korsten ◽  
...  
Keyword(s):  
Molecular Diagnosis ◽  
Respiratory Tract Infections ◽  
Point Of Care ◽  
Test Results ◽  
Rapid Antigen Detection Test ◽  
Rsv Infection ◽  
Syncytial Virus ◽  
Low Sensitivity ◽  
Tract Infections ◽  
Point Of Care Detection

Abstract Background Respiratory syncytial virus (RSV) is a major cause of hospitalization in infants. Early detection of RSV can optimize clinical management and minimize use of antibiotics. BinaxNOW RSV (BN) is a rapid antigen detection test that is widely used. We aimed to validate the sensitivity of BN in hospitalized and nonhospitalized infants against the gold standard of molecular diagnosis. Methods We evaluated the performance of BN in infants with acute respiratory tract infections with different degrees of disease severity. Diagnostic accuracy of BN test results were compared with molecular diagnosis as reference standard. Results One hundred sixty-two respiratory samples from 148 children from October 2017 to February 2019 were studied. Sixty-six (40.7%) samples tested positive for RSV (30 hospitalizations, 31 medically attended episodes not requiring hospitalization, and 5 nonmedically attended episodes). Five of these samples tested positive with BN, leading to an overall sensitivity of BN of 7.6% (95% confidence interval [CI], 3.3%–16.5%) and a specificity of 100% (95% CI, 96.2%–100%). Sensitivity was low in all subgroups. Conclusions We found a low sensitivity of BN for point-of-care detection of RSV infection. BinaxNOW RSV should be used and interpreted with caution.

Unraveling the Mystery of Auditory Brainstem Response Corrections: The Need for Universal Standards

2017 ◽  
Vol 28 (10) ◽  
pp. 950-960 ◽  
Author(s):  
Linda W. Norrix ◽  
David Velenovsky
Keyword(s):  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Evidence Based ◽  
Test Results ◽  
Behavioral Thresholds ◽  
Hearing Thresholds ◽  
Brainstem Response ◽  
Two Measures ◽  
Impaired Children ◽  
Universal Standard

Background: The auditory brainstem response (ABR) is used to estimate behavioral hearing thresholds in infants and difficult-to-test populations. Differences between the toneburst ABR and behavioral thresholds exist making the correspondence between the two measures less than perfect. Some authors have suggested that corrections be applied to ABR thresholds to account for these differences. However, because there is no agreed upon universal standard, confusion regarding the use of corrections exists. Purpose: The primary purpose of this article is to review the reasoning behind and use of corrections when the toneburst ABR is employed to estimate behavioral hearing thresholds. We also discuss other considerations that all audiologists should be aware of when obtaining and reporting ABR test results. Results: A review of the purpose and use of corrections reveals no consensus as to whether they should be applied or which should be used. Additionally, when ABR results are adjusted, there is no agreement as to whether additional corrections for hearing loss or the age of the client are necessary. This lack of consensus can be confusing for all individuals working with hearing-impaired children and their families. Conclusions: Toneburst ABR thresholds do not perfectly align with behavioral hearing thresholds. Universal protocols for the use of corrections are needed. Additionally, evidence-based procedures must be employed to obtain valid ABRs that will accurately estimate hearing thresholds.

scholarly journals Spectral Calibration Algorithm for the Geostationary Environment Monitoring Spectrometer (GEMS)

2020 ◽  
Vol 12 (17) ◽  
pp. 2846
Author(s):  
Mina Kang ◽  
Myoung-Hwan Ahn ◽  
Xiong Liu ◽  
Ukkyo Jeong ◽  
Jhoon Kim
Keyword(s):  
Solar Irradiance ◽  
Spectral Response ◽  
Nonlinear Least Squares ◽  
Reference Spectrum ◽  
Test Results ◽  
Environment Monitoring ◽  
Spectral Calibration ◽  
Sensitivity Tests ◽  
Calibration Algorithm ◽  
Least Squares Approach

The Geostationary Environment Monitoring Spectrometer (GEMS) onboard the Geostationary Korean Multi-Purpose Satellite 2B was successfully launched in February 2020. GEMS is a hyperspectral spectrometer measuring solar irradiance and Earth radiance in the wavelength range of 300 to 500 nm. This paper introduces the spectral calibration algorithm for GEMS, which uses a nonlinear least-squares approach. Sensitivity tests for a series of unknown algorithm parameters such as spectral range for fitting, spectral response function (SRF), and reference spectrum were conducted using the synthetic GEMS spectrum prepared with the ground-measured GEMS SRF. The test results show that the required accuracy of 0.002 nm is achievable provided the SRF and the high-resolution reference spectrum are properly prepared. Such a satisfactory performance is possible mainly due to the inclusion of additional fitting parameters of spectral scales (shift, squeeze, and high order shifts) and SRF (width, shape and asymmetry). For the application to the actual GEMS data, in-orbit SRF is to be monitored using an analytic SRF function and the measured GEMS solar irradiance, while a reference spectrum is going to be selected during the instrument in-orbit test. The calibrated GEMS data is expected to be released by the end of 2020.

The Torrance Tests of Creative Thinking and the Rorschach Inkblot Test: Relationships between Two Measures of Creativity

1978 ◽  
Vol 46 (2) ◽  
pp. 539-547 ◽  
Author(s):  
Margaret Baker
Keyword(s):  
Creative Thinking ◽  
Divergent Thinking ◽  
Human Movement ◽  
Test Results ◽  
Significant Relationships ◽  
Fourth Grade Students ◽  
Total Movement ◽  
Two Measures ◽  
Rorschach Inkblot Test ◽  
Inkblot Test

The purpose of this study is to determine whether there are any significant correlations between the subscores and total scores of the Torrance Tests of Creative Thinking and the Rorschach Inkblot Test, as scored by the Rorschach Index of Repressive Style. Twenty-six teachers of Grades 3, 4, and 5 and 51 fourth grade students were given, by group administration, the Torrance Tests of Creative Thinking and the Rorschach Inkblot Test. Results show that although neither the Total Verbal, Total Non-verbal nor Over-all Torrance scores correlate significantly with either the Rorschach Human Movement score or with the Rorschach Total Movement score (HM + FM + m), there are significant relationships between the Total RIR, m score and the Over-all Torrance score. The main conclusion is that the Rorschach HM and Total M score measure artistic, associative, intuitive creativity, while the Torrance Tests of Creative Thinking and RIR Total score measure divergent thinking.

scholarly journals Poor Performance of the Chlamydia Rapid Test Device for the Detection of Asymptomatic Infections in South African Men: A Pilot Study

2016 ◽  
Vol 2016 ◽  
pp. 1-3 ◽  
Author(s):  
N. S. Abbai-Shaik ◽  
T. Reddy ◽  
S. Govender ◽  
G. Ramjee
Keyword(s):  
South African ◽  
Sensitivity And Specificity ◽  
Rapid Test ◽  
Poor Performance ◽  
Current Approach ◽  
Test Results ◽  
Pcr Assay ◽  
Asymptomatic Infections ◽  
Low Sensitivity ◽  
Asymptomatic Men

Background. To the best of our knowledge, there have been no published reports on the diagnostic performance of the Chlamydia Rapid Test (CRT) Device for male urine samples. We evaluated the performance of the CRT Device when compared with that of the BD ProbeTec ET PCR Assay in a population of asymptomatic men. Methods. The study enrolled 100 men between June and July 2015. From each consenting male, 20–30 mL of urine was collected. Sensitivity and specificity of the rapid test compared to PCR were calculated. All analysis was performed in STATA version 13. Results. All men had valid rapid and PCR test results. The test showed a low sensitivity against PCR (20%) (95% CI 3.7–6.2%); however, an excellent specificity was observed (100%) (one sided 97.5% CI: 96.0–100). Conclusions. This test was not found to be suitable as a screening tool for genital Chlamydia infections in men. Our findings emphasize the need for more sensitive POC tests to be developed since the current approach for the management of STIs in Africa is confounded by poor sensitivity and specificity resulting in many infected individuals not being treated.

scholarly journals Low sensitivity of ParaHIT-f rapid malaria test among patients with fever in rural health centers, Northern Tanzania

2011 ◽  
Vol 5 (03) ◽  
pp. 204-208 ◽  
Author(s):  
Eliningaya John Kweka ◽  
Asanterabi Lowassa ◽  
Shandala Msangi ◽  
Epiphania E Kimaro ◽  
Ester E Lyatuu ◽  
...  
Keyword(s):  
Rapid Test ◽  
Health Centers ◽  
Diagnostic Tools ◽  
Test Results ◽  
Predictive Values ◽  
Rural Tanzania ◽  
Northern Tanzania ◽  
Low Sensitivity ◽  
Sensitivity Specificity ◽  
Malaria Test

Introduction: Several rapid diagnostic tools for malaria are currently available in local markets. However, diagnostic accuracy varies widely. The present study was conducted to evaluate a cheaply and easily available rapid diagnostic malaria test (ParaHIT-f) in rural Tanzania. Methodology: Participants presenting with fever at health centers in the Kilimanjaro and Manyara regions were eligible. Parasitological thin and thick smears were examined from finger-prick blood samples and compared to ParaHIT-f test results. Sensitivity, specificity and predictive values were calculated using microscopic parasitological examination as the gold standard. Results: In total, 236/743 (31.8%) individuals had a positive malaria microscopy, and 25/715 (3.4%) were positive in the rapid diagnostic test. The sensitivity of ParaHIT-f was 10.7% (95% CI, 6.7-14.7) and specificity was 100% (95% CI, 97.4-102), with positive and negative predictive values (PPV and NPV) of 100% (95% CI, 99.1-100.2) and 70.9% (95% CI, 66.9-74.9) respectively. Sensitivity of ParaHIT-f increased with increasing P. falciparum density (P > 0.003) from 5.8% (95% CI, 0-12.9) at < 100 parasites/μl to 20.5% (95% CI, 13.5-27) at ≥ 100 parasites/μl. Conclusions: Sensitivity of the ParaHIT-f rapid test was very low in this setting, therefore concomitant use of rapid diagnostic tests and microscopy is recommended. In the case of positive test results, confirmation by parasitological techniques is not necessary. Further monitoring of ParaHIT-f in various epidemiological settings in Tanzania is warranted. 

scholarly journals Distributions of p-values smaller than .05 in Psychology: What is going on?

2016 ◽  
Author(s):  
Chris HJ Hartgerink ◽  
Robbie CM van Aert ◽  
Michèle B Nuijten ◽  
Jelte M. Wicherts ◽  
Marcel ALM van Assen
Keyword(s):  
Social Psychology ◽  
Direct Evidence ◽  
Developmental Psychology ◽  
High Impact ◽  
Test Results ◽  
Applied Psychology ◽  
P Values ◽  
Psychological Literature ◽  
Two Measures ◽  
Over Time

Previous studies provided mixed findings on pecularities in p-value distributions in psychology. This paper examined 258,050 test results across 30,710 articles from eight high impact journals to investigate the existence of a peculiar prevalence of p-values just below .05 in the psychological literature, and a potential increase thereof over time. We indeed found evidence for a bump just below .05 in the distribution of exactly reported p-values in the journals Developmental Psychology, Journal of Applied Psychology, and Journal of Personality and Social Psychology, but the bump did not increase over the years and disappeared when using recalculated p-values. We found clear and direct evidence for the QRP ”incorrect rounding of p-value” (John et al., 2012) in all psychology journals. Finally, we also investigated monotonic excess of p-values, an effect of certain QRPs that has been neglected in previous research, and developed two measures to detect this by modeling the distributions of statistically significant p-values. Using simulations and applying the two measures to the retrieved test results, we argue that, although one of the measures suggests the use of QRPs in psychology, it is difficult to draw general conclusions concerning QRPs based on modeling of p-value distributions.

Study on Calibration Algorithm of Embedded Touch Screen

2014 ◽  
Vol 9 (4) ◽  
Author(s):  
Ping-yong Li ◽  
Zhong-wen Li
Keyword(s):  
Touch Screen ◽  
Calibration Algorithm
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