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Search Results: 1 - 10 of 224551 matches for " Laith R. Sultan "
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Observer Variability in BI-RADS Ultrasound Features and Its Influence on Computer-Aided Diagnosis of Breast Masses  [PDF]
Laith R. Sultan, Ghizlane Bouzghar, Benjamin J. Levenback, Nauroze A. Faizi, Santosh S. Venkatesh, Emily F. Conant, Chandra M. Sehgal
Advances in Breast Cancer Research (ABCR) , 2015, DOI: 10.4236/abcr.2015.41001
Abstract: Objective: Computer classification of sonographic BI-RADS features can aid differentiation of the malignant and benign masses. However, the variability in the diagnosis due to the differences in the observed features between the observations is not known. The goal of this study is to measure the variation in sonographic features between multiple observations and determine the effect of features variation on computer-aided diagnosis of the breast masses. Materials and Methods: Ultrasound images of biopsy proven solid breast masses were analyzed in three independent observations for BI-RADS sonographic features. The BI-RADS features from each observation were used with Bayes classifier to determine probability of malignancy. The observer agreement in the sonographic features was measured by kappa coefficient and the difference in the diagnostic performances between observations was determined by the area under the ROC curve, Az, and interclass correlation coefficient. Results: While some features were repeatedly observed, κ = 0.95, other showed a significant variation, κ = 0.16. For all features, combined intra-observer agreement was substantial, κ = 0.77. The agreement, however, decreased steadily to 0.66 and 0.56 as time between the observations increased from 1 to 2 and 3 months, respectively. Despite the variation in features between observations the probabilities of malignancy estimates from Bayes classifier were robust and consistently yielded same level of diagnostic performance, Az was 0.772-0.817 for sonographic features alone and 0.828-0.849 for sonographic features and age combined. The difference in the performance, ΔAz, between the observations for the two groups was small (0.003-0.044) and was not statistically significant (p < 0.05). Interclass correlation coefficient for the observations was 0.822 (CI: 0.787-0.853) for BI-RADS sonographic features alone and for those combined with age was 0.833 (CI: 0.800-0.862). Conclusion: Despite the differences in the BI-RADS sonographic features between different observations, the diagnostic performance of computer-aided analysis for differentiating breast masses did not change. Through continual retraining, the computer-aided analysis provides consistent diagnostic performance independent of the variations in the observed sonographic features.
Percutaneous CT-Guided Drainage of Gastric Leaks Post-Sleeve Gastrectomy  [PDF]
Sultan R. Alharbi
Open Journal of Radiology (OJRad) , 2020, DOI: 10.4236/ojrad.2020.101001
Abstract: Objectives: The aim of this study was to assess the safety and efficacy of percutaneous CT-guided drainage of gastric leaks post sleeve gastrectomy. Methods: For this single-center retrospective study, we reviewed the clinical data of 78 patients (44 men and 34 women with an average age of 34.6 ± 10.5 years and a body mass index (BMI) of 45 kg/m2 ± 3.2) that underwent percutaneous CT-guided drainage of gastric leaks due to sleeve gastrectomy from September 2011 to September 2018. The outcome measurements were technical and clinical success, complications, and the need for revisional surgery. Results: The technical success rate of drain insertion was 97.5% (76/78 patients). All of the patients (76/76 patients) exhibited early clinical and laboratory improvement, and no emergency surgery was required. However, six patients underwent revisional surgery after 3 - 5 months for non-healing gastric leaks/fistulas. One patient had a major complication of active bleeding due to arterial injury; this was managed by transcatheter coil embolization. All patients underwent endoluminal stent placement and received antimicrobial therapy and nutritional support. Conclusion: Percutaneous CT-guided drainage of gastric leaks after sleeve gastrectomy is a safe, effective, and minimally invasive alternative to surgery. This technique is in line with other conservative measures (endoluminal stent placement, antimicrobial therapy, and nutritional support), which heal most gastric leaks due to sleeve gastrectomy and prevent the need for revisional surgery.
Exploring the Relationship between Ethical Sales Behavior, Relationship Quality, and Customer Loyalty
Laith Alrubaiee
International Journal of Marketing Studies , 2012, DOI: 10.5539/ijms.v4n1p7
Abstract: In today's heightened ethical awareness and increased competitive pressure, the implications of ethical behavior for financial institutions have become a vital determinant of customer loyalty. The purpose of this study is to develop a conceptual framework to investigate the relationship between ethical sales behavior, relationship quality, and customer loyalty. The proposed model is tested on data collected from 217 bank customers. Structural equation modeling technique was employed using AMOS 7.0 to verify the reliability and validity of the multi-item scales and to test the hypothesized relationships. Result indicates that ethical behavior did increase customer loyalty to the bank; yet this effect was not direct, but mediated by customer trust and customer commitment to the bank. Findings also indicate that, customer trust in the bank has positive effects on customer commitment to the bank. The result of this study positions customer trust and customer commitment as the primary mechanism through which the beneficial effects of ethical sales behavior are realized. However, the study show that perceived ethical behavior has a major impact on the development and maintenance of the customer-bank relationship. Bank manager, which value the critical importance of long term relationships with their customers, should achieve an environment where the potential for unethical behavior is at a minimum.
Services provided at the premarital counseling center and characteristics of the clients, in kayseri, Turkey  [PDF]
rüvvet Ba?er, Tülay ?zkan, P?nar Tekinsoy, Evrim Albayrak, Sultan Ta?ci
Health (Health) , 2011, DOI: 10.4236/health.2011.36057
Abstract: Objectives: The study was conducted retro-spectively to evaluate the services offered at the Premarital Counseling Center (PCC) and the characteristics of the individuals who obtained counseling at the center in Kayseri. Methods: A retrospective review is based on data from the Premarital Counseling Center (PCC) in Kayseri. Seven hundred fifty four (754) individuals who attended the Center were included in the study sample. Data were collected from the Center’s records. Records of all people were reviewed by the researchers. Differences in proportions were analyzed by Chi square test and t test. Results: The age-average of the individuals who consulted the PCC was 26.2 ± 8.3, 91.1% of the individuals had Rh (+), 99.5% of them had VDRL (-), 3.9% had Hbs Ag (+), 0.8% had HCV (+) while none of the individuals was HIV (+) affected. It’s shown that 90.6% of the individuals who were between the ages of 15 - 19 were women, 9.4% of them were men. The difference between the age and the gender of the individuals who came to the center was considered significant. It was determined that the individuals who received counseling services at the PCC were not given any kind of educational and consulting services before.
On Exact Solutions of Second Order Nonlinear Ordinary Differential Equations  [PDF]
Amjed Zraiqat, Laith K. Al-Hwawcha
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.66087
Abstract: In this paper, a new approach for solving the second order nonlinear ordinary differential equation y’’ + p(x; y)y’ = G(x; y) is considered. The results obtained by this approach are illustrated by examples and show that this method is powerful for this type of equations.
Radium and Uranium Concentrations Measurements in Vegetables Samples of Iraq  [PDF]
Abdalsattar Kareem Hashim, Laith Ahmed Najam
Detection (Detection) , 2015, DOI: 10.4236/detection.2015.34004
Abstract: In the present study twenty-two vegetable samples were collected from Iraqi market. Sealed can technique using CR-39 plastic track detector strippable has been used in order to measure radium and uranium concentrations. Etching was done with 6.25 N NaOH and optical microscope was used with the purpose of counting of alpha particle tracks. The values of effective radium content are found to range from 0.074 Bq/ kg to 0.566 Bq/ kg with the mean value of 0.317 Bq/kg. The values of uranium concentrations are found to range from 0.081 ppm to 0.615 ppm with the mean value of 0.345 ppm. Positive correlation has been observed between radium concentration and uranium concentrations in vegetable samples. Measurements of radium and uranium concentrations in vegetables are important from the health protection point of view, so simple and reliable analytical methods must be available.
Some exact inequalities of Hardy-Littlewood-Polya type for periodic functions
Laith Emil Azar
International Journal of Mathematics and Mathematical Sciences , 2004, DOI: 10.1155/s016117120430921x
Abstract: We investigate the following problem: for a given A≥0, find the infimum of the set of B≥0 such that the inequality ‖x(k)‖22≤A‖x(r)‖22
Modeling the Effects of Integrating Larval Habitat Source Reduction and Insecticide Treated Nets for Malaria Control
Laith Yakob, Guiyun Yan
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0006921
Abstract: Integrated vector management for malaria control has received a lot of recent interest. Attacking multiple points in the transmission cycle is hoped to act synergistically and improve upon current single-tool interventions based on the use of insecticide-treated bed nets (ITNs). In the present study, we theoretically examined the application of larval habitat source reduction with ITNs in reducing malaria transmission. We selected this type of environmental management to complement ITNs because of a potential secondary mode of action that both control strategies share. In addition to increasing vector mortality, ITNs reduce the rate at which female mosquitoes locate human hosts for blood feeding, thereby extending their gonotrophic cycle. Similarly, while reducing adult vector emergence and abundance, source reduction of larval habitats may prolong the cycle duration by extending delays in locating oviposition sites. We found, however, that source reduction of larval habitats only operates through this secondary mode of action when habitat density is below a critical threshold. Hence, we illustrate how this strategy becomes increasingly effective when larval habitats are limited. We also demonstrate that habitat source reduction is better suited to human populations of higher density and in the presence of insecticide resistance or when the insecticidal properties of ITNs are depleted.
The effect of formalin, alcohol and freezing on some body proportions of Alepes djeddaba (Pisces: Carangidae) collected from the Red Sea coast of Yemen
Jawad,Laith A;
Revista de biología marina y oceanografía , 2003, DOI: 10.4067/S0718-19572003000200004
Abstract: se investigó el efecto de formalina, alcohol y congelamiento en las proporciones de tres partes del cuerpo en el pez alepes djeddaba. las técnicas de preservación tuvieron diferente efecto en la longitud total, estándar y de la cabeza de a. djeddaba recolectados en la costa del mar rojo de yemen,. las técnicas de preservación y congelación no afectaron la morfología de los peces en 8 de 21 pruebas. se observó encogimiento en siete casos y un aumento en las proporciones del cuerpo en seis casos
Investigate the impact of relationship marketing orientation
Laith Salman Alrubaiee
International Journal of Marketing Studies , 2010,
Abstract: In today high competitive and globalize banking context, increasing Customer loyalty emerge as the most important challenges faced by marketers. Cultivating loyal customers is frequently argued to be the single most important driver of organizations’ long-term financial performance, so can lead to increased sales and customer share, lower costs, and higher prices. Therefore Marketing scholars emphasize the influence of Relationship marketing as a strategically important tool from which customer loyalty can be secured and, as a result, the attainment of higher competitiveness and enhanced customer satisfaction can be achieved. The purpose of this study is to empirically investigate the impact of relationship marketing orientation on customer loyalty. The study also aims to test the impact of demographic variables, in association with relationship marketing dimensions , on customer loyalty. The study was carried out in 2008 on a convenience sample of 450 respondents through the distribution of structured questionnaires to bank customers within the area of Amman, Jordan. The data were factor analyzed to determine the key dimensions of relationship marketing orientation measurement scale. Results confirm that the five dimensions scale(Bonding , trust, communication, satisfaction and commitment) possesses adequate reliability and internal consistency as well as convergent validity. Results of regression analysis show that relationship marketing orientation are significant in explaining the variation in customer loyalty. In addition, sex and income
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