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Search Results: 1 - 10 of 596 matches for " Issa "
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Reduction of artifacts in dental cone beam CT images to improve the three dimensional image reconstruction  [PDF]
Issa Ibraheem
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.58052
Abstract: Cone-beam CT (CBCT) scanners are based on volumetric tomography, using a 2D extended digital array providing an area detector [1,2]. Compared to traditional CT, CBCT has many advantages, such as less X-ray beam limitation, and rapid scan time, etc. However, in CBCT images the x-ray beam has lower mean kilovolt (peak) energy, so the metal artifact is more pronounced on. The position of the shadowed region in other views can be tracked by projecting the 3D coordinates of the object. Automatic image segmentation was used to replace the pixels inside the metal object with the boundary pixels. The modified projection data, using synthetically Radon Transformation, were then used to reconstruct a new back projected CBCT image. In this paper, we present a method, based on the morphological, area and pixel operators, which we applied on the Radon transformed image, to reduce the metal artifacts in CBCT, then we built the Radon back project images using the radon invers transformation. The artifacts effects on the 3d-reconstruction is that, the soft tissues appears as bones or teeth. For the preprocessing of the CBCT images, two methods are used to recognize the noisy black areas that the first depends on thresholding and closing algorithm, and the second depends on tracing boundaries after using thresholding algorithm too. The intensity of these areas is the lowest in the image than other tissues, so we profit this property to detect the edges of these areas. These two methods are applied on phantom and patient image data. It deals with reconstructed CBCT dicom images and can effectively reduce such metal artifacts. Due to the data of the constructed images are corrupted by these metal artifacts, qualitative and quantitative analysis of CBCT images is very essential.
Novel approach for the automated detection of allergy test using spectral imaging  [PDF]
Issa Ibraheem
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.58053
Abstract: This paper proposes a novel approach for the automatic detection of allergy test (allergy lesion). A hyperspectral microscope system was used to image the test samples which were diagnosed by dermatologist. It was found that allergy of different levels, and healthy skin cells show absorption spectra, which are sufficiently characteristic and yet reproducible enough to allow for differentiation when using a spectroscopic system. Principal components analysis was used to extract relevant features that could be used for classification from these spectra. Preliminary results indicate that the different types of allergy cells can be reliably distinguished by these features. We conclude that hyperspectral microscopic analysis is a promising approach for improving and automating the diagnosis of allergy test as well as another skin lesions.
Comparative Study of Functions Affecting the Behavioral Patterns of Tourists in Iran and America’s Tourism Marketing Plan Utilizing SWOT Model  [PDF]
Issa Ebrahimzadeh, Monir Yari
Journal of Service Science and Management (JSSM) , 2013, DOI: 10.4236/jssm.2013.61003
Abstract:

Behavioral patterns of tourists are designed aiming to present a scientific framework of how the variables are interacted and factors influencing consumer behavior can help decision makers and market activists in predicting and controlling consumer behavior. This study aims to explore the functions influencing tourist’s behavioral patterns in Iran and America’s tourism marketing planning which has comparatively been studied. The research methodology is analytical-descriptive and it has been studied and analyzed utilizing SWOT technique. Analytical results of this study show that America in proportion with culture, potentials and operational functions in Iran can be in some cases exploited.

Macroeconomic Determinants of the Mobilization of Tax Revenues of the Countries of the West African Economic and Monetary Union (WAEMU)  [PDF]
Issa Larba Kobyagda
Modern Economy (ME) , 2019, DOI: 10.4236/me.2019.101017
Abstract:

This article aims to analyze the fiscal potential of UEMOA member countries. The question of the fiscal potential of the states is of great importance since the domestic resources represent a high proportion in the financing in Plans and strategies of economic and social development. In this article, we adopt the technique of stochastic border estimation, which is more intuitive—and potentially more relevant for policies—to measure the potential and fiscal effort over the period 1990-2017. The results show that the tax burden is determined by structural factors and that, in most countries, the tax potential is underutilized. Similarly, the fiscal effort shows poor performance in terms of resource mobilization in the majority of countries. These results show that the WAEMU countries can reach or exceed the tax rate of 20% minimum set by the UEMOA if efforts are made to better tax the informal sector. The main contributions of this article have been to justify empirically the increase of the minimum pressure rate in the UEMOA from 17% to 20% and to demonstrate that a better taxation of the agricultural sector would considerably affect the mobilization of tax revenues.

Swelling Properties of New Hydrogels Based on the Dimethyl Amino Ethyl Acrylate Methyl Chloride Quaternary Salt with Acrylic Acid and 2-Methylene Butane-1,4-Dioic Acid Monomers in Aqueous Solutions  [PDF]
Issa Katime, Eduardo Mendizábal
Materials Sciences and Applications (MSA) , 2010, DOI: 10.4236/msa.2010.13026
Abstract: Hydrogels of dimethylaminoethyl acrylate methyl chloride quaternary salt (Q9) have been synthesized with different monomer ratio by copolymerization of this poorly studied monomer either with acrylic acid or with 2-methylene bu-tane-1,4-dioic acid. Hydrogel swelling was measured as a function of the composition of the hydrogel and of the crosslinking agent ratio. High values of swelling have been obtained at very high crosslinking values (< 14 wt %) and the equilibrium swelling was reached at very low time (less than 15 minutes). The swelling isotherms consisted of a steep initial portion and then levelled off as asymptotically to the equilibrium swelling limit. The experimental data suggest clearly that the swelling process obeys second-order kinetics. According to this, the kinetics rate constant and the equilibrium water content were determined at different comonomer composition and crosslinker concentration. The calculated kinetic constants ranged from 0.48 to 3.76 × 10-2 min-1 for poly (acrylic acid-co-Q9) hydrogels and from 0.68 to 4.0 × 10-2 min-1 for poly (2-methylene butane-1,4-dioic acid-co-Q9) hydrogels depending on the hydrogels composition. The diffusion process was evaluated for each hydrogel showing a non-Fickian type diffusion. In all cases was observed a considerable increase in diffusion coefficient as Q9 content increases.
Manifolds with Bakry-Emery Ricci Curvature Bounded Below  [PDF]
Issa Allassane Kaboye, Bazanfaré Mahaman
Advances in Pure Mathematics (APM) , 2016, DOI: 10.4236/apm.2016.611061
Abstract: In this paper we show that, under some conditions, if M is a manifold with Bakry-émery Ricci curvature bounded below and with bounded potential function then M is compact. We also establish a volume comparison theorem for manifolds with nonnegative Bakry-émery Ricci curvature which allows us to prove a topolological rigidity theorem for such manifolds.
Crystal Structure, Thermal Behavior and Vibrational Spectra of 4,4’Diamoniumdiphenylmethan Sulfate Hydrate  [PDF]
Takoua Ben Issa, Latifa Benhamada
Open Journal of Inorganic Chemistry (OJIC) , 2017, DOI: 10.4236/ojic.2017.72004
Abstract: Single crystals of the 4,4’-diamoniumdiphenylmethan sulfate hydrate, denoted DDPS, were grown by slow evaporation solution technique at room temperature. The compound was characterized by single crystal X-ray diffraction, IR and thermal analysis (TG-DTA). It crystallizes in the monoclinic system (space group C2/c) with the following unit cell dimensions: a = 17.7635(10) ?, b = 9.3796(10) ?, c = 27.5676(10) ?, β = 97.37(2)°, V = 4555.2(6) . The structure was solved by the direct method and refined to final R value of 0.0472 for 2108 independent reflections. The anions are hydrogen bonded to each other, forming clusters [HS2O8]3 parallel to the plan (a, b). The water molecules connect these clusters via O-H···O hydrogen bonds. The organic cations are attached to the clusters through N-H···O hydrogen bonds, forming an infinite three-dimensional network.
Erratum to “Manifolds with Bakry-Emery Ricci Curvature Bounded Below”, Advances in Pure Mathematics, Vol. 6 (2016), 754-764  [PDF]
Issa Allassane Kaboye, Bazanfaré Mahaman
Advances in Pure Mathematics (APM) , 2017, DOI: 10.4236/apm.2017.711039
Abstract: The original online version of this article (Issa Allassane Kaboye, Bazanfaré Mahaman (2016) Manifolds with Bakry-Emery Ricci Curvature bounded below 6, 754-764. http://dx.doi.org/10.4236/apm.2016.611061 unfortunately contains a mistake. The author wishes to correct the errors.
Optimization of ATSC Mobile Handheld Service Capacity
Omneya Issa
International Journal of Digital Multimedia Broadcasting , 2013, DOI: 10.1155/2013/837153
Abstract:
Safety of pegylated interferon and ribavirin therapy for chronic hepatitis C in patients with sickle cell anemia
Hussain Issa
World Journal of Hepatology , 2010,
Abstract: AIM: To evaluate the safety and efficacy of combined pegylated interferon and ribavirin for the treatment of chronic hepatitis C (HCV) in patients with sickle cell anemia (SCA).METHODS: Fifty-two patients with SCA and HCV were treated over a period of 7 years from June 2002 to July 2009. Their medical records were reviewed for: age at treatment, sex, body mass index, Hb level at the start of therapy and on follow-up, hemoglobin electrophoresis, liver function tests, G6PD level, LDH, bilirubin, HCV-RNA viral load, HCV genotype, liver biopsy, duration of treatment, and side effects. All were treated with pegylated interferon and a standard dose of ribavirin. The treatment was continued for 24 wk for those with genotype 2 and 3 and for 48 wk for those with genotype 1 and 4.RESULTS: Fifty-two patients (30 females and 22 males) were treated. Their mean age was 29.5 years (range 15-54 years). HCV genotype was determined in 48 and 15 had liver biopsy. Their mean pre-treatment HCV-RNA viral load was 986330 IU/mL (range 12762-3329282 IU/mL). The liver biopsy showed grade I in 6 and grade II in 9 and stage I in 13 and stage II in 2. Only 8 were receiving hydroxyurea at the time of treatment. All tolerated the treatment well and none experienced a decrease in their Hb which required blood transfusion pre, during or after therapy. There were no hematological side effects attributable to ribavirin at the usual recommended dose. Thirty-seven (71.2%) achieved SVR at 6 mo after the end of treatment. The remaining 15 were non-responders. Two of them showed an ETR but had a relapse. The remaining 13 had a relatively significant HCV-RNA viral load with a mean HCV-RNA viral load of 1829741.2 IU/mL (900000-3329282 IU/mL) and eight of them had HCV genotype 1, four had HCV genotype 4, and one had HCV genotype 5.CONCLUSION: Patients with SCA and HCV can be treated with pegylated interferon and ribavirin at the usual recommended dose. This is even so in those who are not receiving hydroxyurea. The treatment is safe and effective and the response rate is comparable to those without SCA.
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