A Survey on Service Composition Middleware in Pervasive Environments

The development of pervasive computing has put the light on a challenging problem: how to dynamically compose services in heterogeneous and highly changing environments? We propose a survey that defines the service composition as a sequence of four steps: the translation, the generation, the evaluation, and finally the execution. With this powerful and simple model we describe the major service composition middleware. Then, a classification of these service composition middleware according to pervasive requirements - interoperability, discoverability, adaptability, context awareness, QoS management, security, spontaneous management, and autonomous management - is given. The classification highlights what has been done and what remains to do to develop the service composition in pervasive environments

Semantic Service Substitution in Pervasive Environments

A computing infrastructure where everything is a service offers many new system and application possibilities. Among the main challenges, however, is the issue of service substitution for the application execution in such heterogeneous environments. An application would like to continue to execute even when a service disappears, or it would like to benefit from the environment by using better services with better QoS when possible. In this article, we define a generic service model and describe the equivalence relations between services considering the functionalities they propose and their non functional QoS properties. We define semantic equivalence relations between services and equivalence degree between non functional QoS properties. Using these relations we propose semantic substitution mechanisms upon the appearance and disappearance of services that fits the application needs. We developed a prototype as a proof of concept and evaluated its efficiency over a real use case

Multimodal Writing of University Students: The Case of Academic Posters

After having been marginalized for a long time as a second-class genre or “the poor country cousin of papers” (Swales & Feak, 2000), academic posters have recently received remarkable attention as a special multimodal genre that is indispensable for the membership of the academic community. In line with the currently growing interest in multimodal writing, the present study seeks to contribute to the limited body of knowledge on academic posters in two ways: first by investigating the textual and visual communicative strategies employed by novice multimodal writers to facilitate the comprehension of their multimodal texts and guide readers through their discourse and second by exploring the perceptions of those young multimodal writers towards that special genre. To accomplish the first objective, a corpus of 100 academic posters gathered from freshmen university students enrolled in a second language research writing course was compiled and analyzed textually and visually drawing mainly on the framework of D’Angelo (2016a) that distinguishes between interactive and interactional resources. To fulfill the second objective, a questionnaire was filled out by 66 students, and four interviews were carried out. Both quantitative and qualitative methods were used in the analysis. Descriptive statistics was employed in the multimodal analysis of the posters as well as the analysis of the questionnaire responses, and a qualitative thematic analysis was conducted to interpret the responses of the interviewees. The quantitative textual and visual analysis revealed a clear dominance of the interactive resources and, to some extent, a lack of making the best use of all the available visual resources. The analysis of the self-reported data unveiled that young multimodal writers hold quite positive perceptions towards the academic poster as a multimodal genre. Further, they tended to decode the interrelation between textual and visual resources as an illustrative or code mixing relationship where both text and visuals complement each other to communicate the intended meaning. The study has pedagogical implications relevant to introducing novice multimodal writers to the available semiotic resources

Towards Green Cities as an Approach to Achieve Climate Change Adaptation

Climate change is a complicated problem and there is an urgent need for climate change adaptation. Cities are the primary drivers of social, economic, and technical progress. Green Cities are cities that show high environmental performance relative to adapting risks derived from climate change while maximizing the economic and social co-benefits. The Authors adopted a data collection strategy to review the issues, and difficulties caused by climate change and how green cities could assist in addressing them, then adopted a case study analysis to analyze the strategies used by Sharm El Sheikh in the transition to green city. The study consequently explored the key factors that support climate change adaptation, which are CO2 emissions, energy, buildings, land use, transport, water and sanitation, waste management, air quality, and environmental governance. It concluded with a set of guidelines that recommends using the potential of green cities as a tool for adapting to climate change challenges

Quality Control Elements and Auditor Fraud Risk Assessment: An Experimental Study

This study investigates and analyzes if auditor performance toward fraud risk assessment can be an indicator for the effectiveness of some of the ISA 220 quality control elements, mainly engagement team experience and direction and supervision. An experiment was conducted with a number of auditors working in audit firms with international affiliations in Egypt. Results suggest that proper auditor experience rather than direction and supervision inside audit firms could have a significant impact on auditor fraud risk assessment. The findings have implications for regulators and the accounting profession concerned with monitoring and promoting audit quality, especially in the Egyptian environment

The role of MRI in the diagnosis of endometriosis

AbstractAimThe aim of this study is to evaluate the accuracy of the magnetic resonance imaging in diagnosis of endometriosis especially in non-apparent types as tubal and cul de sac endometriosis.Patients and methodsMRI obtained between January 2007 and June 2009 for 34 premenopausal women complaining of dysmenorrhea, menorrhagia and infertility and the diagnosis of endometriosis were included in the differential diagnosis. T1 weighted fat saturated and T2 weighted images were done for every patient, we evaluated the MR images for the presence of T1 bright signal suggesting endometriosis. Transvaginal US was performed in two perpendicular planes for the detection of focal areas with ill defined borders or abnormal echo texture. Suspicious cases which become negative by laparoscopy were excluded from the study.ResultsMRI diagnosed endometriosis in the uterus in 18 patients, ovarian endometriosis in 13 patients, tubal in two patients, and cul de sac in one patient.ConclusionIt is concluded that MRI is superior in the diagnosis of endometriosis than transvaginal ultrasound

Evaluation of stresses developed in different bracket-cement-enamel systems using finite element analysis with in vitro bond strength tests

BACKGROUND: The purpose of this study was to determine the bond strength of different orthodontic bracket materials (ceramic, stainless steel, and titanium) as well as stresses developed in bracket-cement-enamel systems using finite element (FE) analysis. METHODS: One hundred and thirty-five extracted human caries-free upper central incisors were divided into three groups (n = 45/group) according to the type of orthodontic bracket materials (stainless steel, ceramic, and titanium). Each group was further subdivided into three subgroups (n = 15/group) according to the bond strength test loading mode (shear short side, shear long side, and tensile). After debonding, the fractured specimen was examined, and the adhesive remnant index (ARI) was determined. FE analysis models analyzed the stress distribution within the cement and enamel. Bond strengths were analyzed using ANOVA and Tukey's test, and the ARI scores were analyzed using chi-square (χ(2)) test. RESULTS: Shear loading at the short side of the bracket resulted in the highest bond strength and lowest maximum principal stress both on cement and enamel compared with the other loading modes (P < 0.05). Ceramic brackets presented with higher bond strength and lower maximum principal stress than metallic brackets (P < 0.05). There was a significant difference for ARI scores between the type of brackets (χ(2) = 64.852, P < 0.001). CONCLUSION: The findings suggest that the manner of loading orthodontic brackets and the selection of orthodontic bracket materials affect the bond strength and stresses developed both on cement and enamel

Olmesartan modulates proliferating cell nuclear antigen expression and improves dextran sulfate - induced ulcerative colitis in rats

Background: Ulcerative colitis (UC) is a chronic inflammatory bowel disease characterized by sudden attacks of remissions and exacerbations with increased incidence of cancer colon. The present study aims to determine the possible ameliorative mechanisms of Olmesartan in UC induced experimentally in rat.Methods: Adult albino rats were randomly grouped into control, UC model non treated group: Rats received dextran sodium (DSS) orally for 21 days with intra-colic administration of acetic acid (AA) for 3 consecutive days for induction of UC model, Olmesartan (1, 5, 10mg/kg/orally) and UC + Olmesartan in different doses (1 mg, 5 mg and 10 mg/kg/day orally).Results: DSS orally and AA intra-rectal produced sever colitis manifested by significant weight loss, watery and bloody diarrhea. Significant increase in serum and colonic tissue levels of tumor necrosis factor alpha and interleukine-1β. Pro-apoptotic Bax protein, myeloperoxidase (MPO) and expression of PCNA significantly increased in colonic tissue. Lipid peroxidation (MDA) significantly elevated while reduced glutathione (GSH) was depleted in UC non-treated group compared with normal control group. Treatment with Olmesartan (5 mg, 10 mg/kg/day, orally) ameliorated mucosal ulceration and improved inflammatory signs as confirmed by immunohistochemical and histopathological examination. Also, Olmesartan significantly attenuates overexpression of PCNA in colonic mucosa.Conclusions: Our results point out that Olmesartan had ameliorative effects on UC by its anti-inflammatory, antioxidant and anti-apoptotic effects and attenuates PCNA expression which is the main cause of dysplasia and colorectal cancer. Olmesartan may be a promising therapeutic drug for treating UC and protection of colorectal carcinoma.