Yemen University of Science and Technology

Sanaa, Yemen

Yemen University of Science and Technology

Sanaa, Yemen
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Alakwaa F.M.,Yemen University of Science and Technology
2011 1st Middle East Conference on Biomedical Engineering, MECBME 2011 | Year: 2011

A new adaptive signal-preserving technique for noise suppression in gene expression data is proposed based on spectral subtraction. The proposed technique estimates a parametric model for the power spectrum of random noise from the acquired data based on the characteristics of the Rician statistical model. The new technique is tested using computer simulations from DREAM3 competition dataset. The results show the potential of the new technique in suppressing noise while preserving the other deterministic components in the signal. Also, this new method outperforms other denoising methods like multi-wavelet algorithm. Moreover, when the new technique is used given its simple form, the new method does not change the statistical characteristics of the signal or cause correlated noise to be present in the processed signal. This suggests the value of the new technique as a useful preprocessing step for gene expression data analysis. © 2011 IEEE.


Al-hebshi N.N.,Yemen University of Science and Technology
Journal of the International Academy of Periodontology | Year: 2010

Whether or not khat chewing is detrimental to the periodontium remains uncertain. Findings from cross-sectional studies have been contradictory and, in most cases, uncontrolled for confounders. OBJECTIVES: to experimentally test the effect of khat chewing on formation of dental plaque and development of gingivitis. METHODS: This was a split-mouth, parallel-group, 20-day experimental gingivitis study involving non-smoking, young, male khat chewers (n = 8) and non-chewers (n = 9). Measurements of plaque index (PI), gingival index (GI), and bleeding on probing (BOP), as experimental outcomes, were performed on days 0, 10, and 20. Scores were compared between the two groups (parallel-group model) and between the khat-chewing and non-chewing sides (split-mouth model). RESULTS: All experimental outcomes significantly increased over time. Results from the two models were consistent. Khat chewing was associated with lower PI scores; however, differences were only significant at day 20. Despite scoring higher in baseline gingival inflammation, the khat chewers and khat-chewing sides showed significantly lower GI and BOP scores at days 10 and 20. The effect of khat chewing was evident on both the lingual and buccal aspects. CONCLUSIONS: The observed anti-plaque and anti-gingivitis properties indicate that khat chewing is probably not detrimental to the periodontium. The validity of previous findings supporting an opposite view is undermined by lack of control for confounders, particularly smoking.


Ahmed B.A.,Yemen University of Science and Technology
Asian Pacific Journal of Cancer Prevention | Year: 2010

Background: Breast cancer (BC) is the most common cancer among females in Yemen and world-wide, Yemeni women are still facing an increasing threat to it in recent years and optimal chances for survival from BC in women can be achieved by detecting it early by Breast self examination (BSE). Objective: To assess the knowledge, attitude and practice of breast cancer and breast self examination among female university students in Al-Mukalla city-2009. Methods: a cross sectional descriptive study was carried out among 425 female university students in Al-Mukalla city by using self administered questionnaire. Results: the study indicated that majority of participants had low level of knowledge of BC 58.6%. Only 1.4% had gained high level of knowledge. 95.3% of participants believed BC is a serious disease. It was found that despite 76.9% of participants heard about BSE, only 17.4% of them were performing it. 55.9% mentioned lack of knowledge about technique of BSE as a barrier for not practicing BSE. Mass media 81.6 % and 67.3% was the first source of information about BC and BSE mentioned by the participants respectively. Conclusion: the majority of participants heard about BC, but their knowledge and understanding of the disease was very low. The most known method of BC detection was BSE, however the majority never practice it due to lack of knowledge about technique.


Al Rohani M.,Yemen University of Science and Technology
Saudi journal of kidney diseases and transplantation : an official publication of the Saudi Center for Organ Transplantation, Saudi Arabia | Year: 2011

Acute renal failure (ARF) is defined as a rapid decrease in the glomerular filtration rate, occurring over a period of hours to days. The Science and Technology University Hospital, Sana'a, is a referral hospital that caters to patients from all parts of Yemen. The aim of this study is to have a deeper overview about the epidemiological status of ARF in Yemeni patients and to identify the major causes of ARF in this country. We studied 203 patients with ARF over a period of 24 months. We found that tropical infectious diseases constituted the major causes of ARF, seen in 45.3% of the patients. Malaria was the most important and dominant infectious disease causing ARF. Hypotension secondary to infection or cardiac failure was seen in 28.6% of the patients. Obstructive nephropathy due to urolithiasis or prostate enlargement was the cause of ARF in a small number of patients. ARF was a part of multi-organ failure in 19.7% of the patients, and was accompanied by a high mortality rate. Majority of the patients were managed conservatively, and only 39.9% required dialysis. Our study suggests that early detection of renal failure helps improve the outcome and return of renal function to normal. Mortality was high in patients with malaria and in those with associated hepatocellular failure.


Ba'amer A.A.,Yemen University of Science and Technology
Eastern Mediterranean Health Journal | Year: 2010

To determine the vaccination coverage for children 12-23 months and to identify reasons for non-vaccination, we conducted a community-based survey in Al Mukalla district. Information about vaccination status and related barriers was collected for 210 children: 82% were fully vaccinated, 12% were partially vaccinated, and 5% were not vaccinated. Drop-out rate between DPT1 and DPT3 was 3.1%. Combining the evidence of vaccine cards and parent's history, the coverage for OPV1 was 94.3%, OPV3 91.4%, measles 90%, and BCG 88.1%. Reasons for not vaccinating included lack of information (54%) and existence of obstacles (35%). There is a need to raise the awareness of families about vaccination and to expand continuous outreach sessions to cover all children.


Webair H.H.,Yemen University of Science and Technology | Bin-Gouth A.S.,Yemen University of Science and Technology
Patient Preference and Adherence | Year: 2013

Appropriate medical care seeking could prevent a significant number of child deaths and complications due to ill health. This study aims to determine factors affecting health seeking behavior (HSB) for childhood illnesses, thereby improving child survival. Methods: A cross sectional study was carried out from January 11 to April 2, 2012. A total of 212 caretakers of children under the age of 5 years participated. Caretakers who visited the vaccination unit in the Shehair Health Center during the study period and had a child with a history of diarrhea, fever, cough, and/or difficulty of breathing during the last 14 days were included. The data were collected by interviewing caretakers and the answers were reported in pretested structured questionnaires. Results: Medical care was sought for about half of the sick children (n=109, 51.42%). Seeking medical care was frequently initiated for illnesses that did not improve or worsened. The major reasons for not seeking medical care were "illness was mild" (n=40, 38.83%) and "illness is not for medical treatment" (n=32, 31.07%). The caretakers sought medical care significantly more when they had a higher level of school education (POR [prevalence odds ratio] 5.85, 95% CI [confidence interval]: 2.34-14.61), when the illness was perceived as severe (POR 5.39, 95% CI: 2.81-10.33), and when the child had difficulty of breathing (POR 2.93, 95% CI: 1.10-7.80). Conclusion: For the preventable childhood illnesses with existing interventions, appropriate HSB prevalence is low. Symptom type, caretakers' education, and perception of illness severity are the predictors of HSB. Educational improvement of the mothers, introduction of community based integrated management of childhood illness, and in-depth research are imperative to improve mothers' HSB. © 2013 Webair and Bin-Gouth.


Al-Haddad A.M.,Yemen University of Science and Technology
Journal of the Egyptian Society of Parasitology | Year: 2010

Six hundred children from urban and rural regions of Hadhramout governorate were examined targeted for the detection of intestinal parasites during the year 2009. The main infective parasites prevailed in children were Gardia lamblia (19.17%), Entamoeba histolytica (16.83%), Ascaris lumbricoides (15.83%), Trichuris trichiura (2.33%), Hymenolepis nana (2.33%), Taenia saginata (1.50%) and Schistosoma mansoni (0.67%). Besides, infections were accompanied by different symptoms as diarrhea (43.5%), abdominal pain (23.3%), abdominal distention (17.3%), constipation (9.1%), nausea and vomiting (8.02%) and fever (5.1%). The parasitosis reflected the hygienic problems and their influence on public health of Hadhramout.


Alkhawlani M.M.,Yemen University of Science and Technology
Proceedings - ICCES 2012: 2012 International Conference on Computer Engineering and Systems | Year: 2012

Heterogeneous Wireless Network (HWN) is defined as a new type of wireless networks where anyone can communicate with anyone else, anywhere and anytime, or enjoy any service of any network operator, through any network of any service provider in the most efficient and optimal way according to the user criteria. The needs for supporting various applications and services and for providing ubiquitous coverage in the HWN require more complex and intelligent radio resource management techniques that enable the coordination among the different radio access technologies. This paper considers the most important radio resource management mechanism in HWN that is Joint Admission Control (JAC). JAC handles all new or handoff service requests in the HWN and checks whether the incoming service requests to be admitted. Then, it allocates the required resources and guarantees the QoS constraints for the service. This paper develops a VIKOR decision support system based algorithm to address the JAC problem in the modern HWN networks. The proposed algorithm aims to decrease the influence of the dissimilar, imprecise, and contradictory measurements for the JAC criteria coming from different sources. A performance analysis is done and the results are compared with traditional algorithms for JAC. These results demonstrate a significant improvement with our developed algorithm. © 2012 IEEE.


BinMerdhah A.B.,Yemen University of Science and Technology
Journal of Petroleum Science and Engineering | Year: 2012

One of the most common methods for preventing scale formation is through the use of scale inhibitor. This study was conducted to investigate the permeability reduction caused by deposition of barium sulfate in Malaysian sandstone and Berea cores from mixing of injected Malaysian seawaters (Angsi and Barton) and formation water that contained high concentration of barium ion at various temperatures (50-95°C) and differential pressures (75-200psig). Scale inhibition efficiency was determined in both the bulk jar and core tests by using scale inhibitors Methylene Phosphonic Acid (DETPMP), Poly-Phosphino Carboxylic Acid (PPCA), and Phosphonate-based scale inhibitor (PBSI) at various temperatures (50-95°C) and concentrations. The results showed that a large extent of permeability damage was caused by barium sulfate that deposited on the rock pore surface. At higher temperatures, the rate of BaSO 4 precipitation decreases since the solubility of BaSO 4 increases with increasing temperature. At 60°C temperature, PPCA showed very efficient BaSO 4 inhibition effect where it reduced most amount of BaSO 4 compared to the DETPMP and PBSI inhibitors. © 2012 Elsevier B.V.


BinMerdhah A.B.,Yemen University of Science and Technology
SPE Production and Operations | Year: 2010

One of the most common methods of preventing downhole and topside mineral-scale formation in oil fields is through the use of chemical-scale inhibitors. Several aspects of the brine composition may affect the performance of the various scale inhibitors used in oilfield applications. This study was conducted to investigate the permeability reduction caused by deposition of calcium sulfate (CaSO4) and strontium sulfate (SrSO4) in Malaysian sandstone and Berea cores from mixing injected Malaysian seawaters (SW) (Angsi and Barton) and formation water (FW) that contain a high concentration of calcium and strontium ions at various temperatures (50 to 95°C) and differential pressures (75 to 200 psig). Scale-inhibition efficiency was determined in both the bulk jar and the core tests by using scale inhibitors methylene phosphonic acid (DETPMP), polyphosphino carboxylic acid (PPCA), and phosphorus-based scale inhibitor (PBSI) at various temperatures (50 to 95°C) and concentrations. The results showed a large extent of permeability damage caused by calcium and strontium sulfates that deposited on the rock pore surface. At higher temperatures, the rate of CaSO4 and SrSO4 precipitation increases because the solubilities of CaSO 4 and SrSO4 scales decrease with increasing temperature. At 90°C temperature, PBSI was the best inhibitor because it reduced more scale deposition compared to the DETPMP and PPCA inhibitors. Copyright © 2010 Society of Petroleum Engineers.

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