Enhancing Secrecy With Multiantenna Transmission in Millimeter Wave Vehicular Communication Systems

Eltayeb, Mohammed E.,Choi, Junil,Al-Naffouri, Tareq Y.,Heath, Robert W. IEEE 2017 IEEE Transactions on Vehicular Technology VT Vol.66 No.9

<P>Millimeter wave (mmWave) vehicular communication systems will provide an abundance of bandwidth for the exchange of raw sensor data and support driver-assisted and safety-related functionalities. Lack of secure communication links, however, may lead to abuses and attacks that jeopardize the efficiency of transportation systems and the physical safety of drivers. In this paper, we propose two physical layer (PHY) security techniques for vehicular mmWave communication systems. The first technique uses multiple antennas with a single radio-frequency (RF) chain to transmit information symbols to a target receiver and noise-like signals in nonreceiver directions. The second technique uses multiple antennas with a few RF chains to transmit information symbols to a target receiver and opportunistically inject artificial noise in controlled directions, thereby reducing interference in vehicular environments. Theoretical and numerical results show that the proposed techniques provide higher secrecy rate when compared to traditional PHY security techniques that require digital or more complex antenna architectures.</P>

Field-assisted sintering of multiphase toughening zirconia ceramics

Khalid Eltayeb 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.1

Field-assisted sintering technology was used to fabricate multiphase zirconia ceramics composed of tetragonal and cubicphases. The composites were based on 3 mol. % yttria tetragonal zirconia polycrystals (3Y-TZP) with the addition of 8.5 mol. % yttria-stabilized zirconia (8.5Y-YSZ). The phase composition of the ceramics was characterized by X-ray diffraction, andthe fracture surface of the bulks was examined by field emission scanning electron microscopy. The phase volume fractionsof the tetragonal and cubic phases in the sintered ceramics were estimated and the mechanical properties of the ceramics wereanalyzed. The multiphase structure and mechanical properties of the ceramics were investigated. The results showed that10 wt. % 8.5YSZ with a yttria content of 3.55 mol. % exhibited the optimal mechanical properties. The maximum fracturetoughness and Vickers hardness were obtained in the ceramic with a tetragonal composition of 99.7 vol. % that was sinteredat 1400°C. These results suggest that the improved mechanical properties of the composites are due to a multiphase effect.

ANOTHER LOOK AT THE DETERMINANTS OF FOREIGN DIRECT INVESTMENT IN MENA COUNTRIES: AN EMPIRICAL INVESTIGATION

Sufian Eltayeb Mohamed,MOISE G. SIDIROPOULOS 중앙대학교 경제연구소 2010 Journal of Economic Development Vol.35 No.2

The paper is concerned with the analysis of the main determinants of foreign direct investment in MENA countries. The estimation is run on the eterminants of FDI in our sample which consist of 36 countries. 12 of these countries were in MENA countries and another 24 were the major recipients of FDI in their respective regions in developing countries. By employing a panel data methodology the study investigates whether the determinants of FDI are similar to the other FDI receiving developing countries. The study reveals that the key determinants of FDI inflows in MENA countries are the size of the host economy, the government size, natural resources and the institutional variables. The paper concludes that, countries that are receiving fewer foreign investments could make themselves more attractive to potential foreign investors. So, the policy makers in the MENA region should remove all barriers to trade, develop their financial system and build appropriate institutions.

Another Look at the Determinants of Foreign Direct Investment in MENA Countries : An Empirical Investigation

SUFIAN ELTAYEB MOHAMED;MOISE G. SIDIROPOULOS 경제연구소 2010 Journal of Economic Development Vol.35 No.2

The paper is concerned with the analysis of the main determinants of foreign direct investment in MENA countries. The estimation is run on the determinants of FDI in our sample which consist of 36 countries. 12 of these countries were in MENA countries and another 24 were the major recipients of FDI in their respective regions in developing countries. By employing a panel data methodology the study investigates whether the determinants of FDI are similar to the other FDI receiving developing countries. The study reveals that the key determinants of FDI inflows in MENA countries are the size of the host economy, the government size, natural resources and the institutional variables. The paper concludes that, countries that are receiving fewer foreign investments could make themselves more attractive to potential foreign investors. So, the policy makers in the MENA region should remove all barriers to trade, develop their financial system and build appropriate institutions.

A Family of Continuous Conduction Mode with Quasi Steady State Approach based on the General Pulse Width Modulator

Ala Eldin Abdallah,Khalifa Eltayeb,Lee, Yong-Hui(이용희),Yi, Jae-Young(이재영),Hong, Yong-In(홍용인),Ryu, Ki-Han(류기한),Yi, Cheon-Hee(이천희) 대한전자공학회 2002 대한전자공학회 학술대회 Vol.2002 No.6

Delta Reverse Polarity Shoulder Replacement: Single Surgeon Experience with a Minimum 2-Year Follow-up

Shah Jehan,Magid Eltayeb,Mohammad Muddassir Mahmood Javaid 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.3

Background: The delta reverse shoulder replacement system was developed for the treatment of rotator cuff arthropathy so that the deltoid can substitute for the deficient rotator cuff. To evaluate the results of delta reverse shoulder replacement for functional improvement and complications in a consecutive series by a single surgeon over a period of six years with a minimum follow-up of 2 years. Methods: The data were collected retrospectively from electronic theatre records. Over a period of 6 years (2006–2012), 46 cases that fulfilled the inclusion criteria were identified. There were 34 females and 12 males. The average age of patients was 76.2 years (range, 58 to 87 years). A single surgeon performed all procedures using the anterosuperior approach. The mean follow-up time was 49 months (range, 24 to 91 months). All cases had preoperative and postoperative Constant scores. We collected the data on indications, hospital stay, and change in the Constant score, complications, and reoperation rates. Results: The main indication for surgery was rotator cuff arthropathy (52.2%), followed by massive rotator cuff tear (28.3%), osteoarthritis (8.7%), fractures (6.5%), and rheumatoid arthritis (4.3%). Also, 65.2% of the cases were referred by general practitioners, 26% of the cases were referred by other consultants, and 8.8% of the cases were already under the care of a shoulder surgeon. The average preoperative Constant score was 23.5 (range, 8 to 59). The average Constant score at the final follow-up was 56 (range, 22 to 83). On average, there was an improvement of 33 points in the Constant score. The improvement in the Constant score was significant (p < 0.001). We observed complications in four patients (8.6%). Three of four patients (6.5%) needed reoperation. The first complication was pulmonary embolism in the early postoperative period. The other complications included dissociation of the glenosphere from the metaglene, deltoid detachment, and stitch abscess. Conclusions: This is a single-surgeon, single-approach series of 46 cases with a minimum follow-up of 2 years. At this stage, the results are encouraging with no cases of loosening, dislocation, or nerve injury.

Determinants of Antenatal Care Services Utilization among Reproductive Age Women in Rural Sudan

( He Luzhu ),( Sirelkhtem Eltayeb Elfaki ),( Jung Hye Hwang ),( Soo Jeung Choi ),( Hayun Kim ),( Haebin Lm ),( Dongwoon Han ) 한국모자보건학회 2016 한국모자보건학회 학술대회 연제집 Vol.2016 No.2

Background The indices of maternal mortality and morbidity in Sudan are among the highest globally, meanwhile poor utilization of antenatal care (ANG) services are reported. Antenatal care services are key maternal health services that can significantly reduce maternal mortality. However, much less is known about the factors associated with utilization of ANG services in rural areas of Sudan. Aim To assess quality of ANG services and identify the factors associated with low prevalence of antenatal care services among reproductive age women in rural Sudan. Method: A cross-sectional study was conducted in four primary health centers in Marawi, Northern Sudan from October to November 2015. The questionnaire was developed with 4 sections, including 3 on independent variables (knowledge of pregnancy, accessibility, socio-demographic), and the dependent variable was utilization of ANG services. Data were collected through face to face interview survey and then coded and analyzed with Excel and SPSS software. Chi-square and logistic regression were used to determine the association between dependent and independent variables. Results 348 women were approached during the survey, only 163 (46.8%) women made four or more ANG visits. Most of them (over 80%) had good knowledge about danger signs and information of pregnancy. ‘Transport cost is high” was the most (56.8%) reported barrier to utilizing ANG services, following answers were “Health center is far” and “Husband refusing” . Distance form home to health center and health services waiting time were significantly related to number of ANG visits. Many socio-demographic characters such as marital status and education level of women or husbands were factors influencing the utilization of ANG services Conclusion Utilization of ANG visits was low in Marawi District. The women living there had good knowledge about pregnancy, however, had several barriers to access the ANG services in health center. Thus, public health intervention programs should be targeted towards improving the pattern of antenatal care use among the reproductive age women in Sudan.

A Randomized, Placebo-controlled Trial of Digestive Enzymes in Children with Autism Spectrum Disorders

Khaled Saad,Azza A. Eltayeb,Ismail L. Mohamad,Abdulrahman A. Al-Atram,Yasser Elserogy,Geir Bjørklund,Amira A. El-Houfey,Bubba Nicholson 대한정신약물학회 2015 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.13 No.2

Objective: There is growing evidence for a gut-brain connection associated with autism spectrum disorders (ASDs). This suggests a potential benefit from introduced digestive enzymes for children with ASD. Methods: We performed a double-blind, randomized clinical trial on 101 children with ASD (82 boys and 19 girls) aged from 3 to 9 years. ASD patients were diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders 4th edition, text revision (DSM-IV-TR) diagnostic criteria. Structured interviews of at least one hour each both with the parents and the child were performed. Later on, another two hours-session was conducted applying the Childhood Autism Rating Scale (CARS). ASD patients were randomized to receive digestive enzymes or placebo. Results: The ASD group receiving digestive enzyme therapy for 3 months had significant improvement in emotional response, general impression autistic score, general behavior and gastrointestinal symptoms. Our study demonstrated the usefulness of digestive enzyme in our population of ASD patients. Conclusion: Digestive enzymes are inexpensive, readily available, have an excellent safety profile, and have mildly beneficial effects in ASD patients. Depending on the parameter measured in our study, we propose digestive enzymes for managing symptoms of ASD. Digestive enzyme therapy may be a possible option in treatment protocols for ASD in the future.

Efficiency and accuracy of artificial intelligence in the radiographic detection of periodontal bone loss: A systematic review

Tariq Asmhan,Nakhi Fatmah Bin,Salah Fatema,Eltayeb Gabass,Abdulla Ghada Jassem,Najim Noor,Khedr Salma Ahmed,Elkerdasy Sara,Al-Rawi Natheer,Al Kawas Sausan,Mohammed Marwan,Shetty Shishir Ram 대한영상치의학회 2023 Imaging Science in Dentistry Vol.53 No.3

Purpose: Artificial intelligence (AI) is poised to play a major role in medical diagnostics. Periodontal disease is one of the most common oral diseases. The early diagnosis of periodontal disease is essential for effective treatment and a favorable prognosis. This study aimed to assess the effectiveness of AI in diagnosing periodontal bone loss through radiographic analysis. Materials and Methods: A literature search involving 5 databases (PubMed, ScienceDirect, Scopus, Health and Medical Collection, Dentistry and Oral Sciences) was carried out. A specific combination of keywords was used to obtain the articles. The PRISMA guidelines were used to filter eligible articles. The study design, sample size, type of AI software, and the results of each eligible study were analyzed. The CASP diagnostic study checklist was used to evaluate the evidence strength score. Results: Seven articles were eligible for review according to the PRISMA guidelines. Out of the 7 eligible studies, 4 had strong CASP evidence strength scores (7-8/9). The remaining studies had intermediate CASP evidence strength scores (3.5-6.5/9). The highest area under the curve among the reported studies was 94%, the highest F1 score was 91%, and the highest specificity and sensitivity were 98.1% and 94%, respectively. Conclusion: AI-based detection of periodontal bone loss using radiographs is an efficient method. However, more clinical studies need to be conducted before this method is introduced into routine dental practice.

Patterns of Esophageal Cancer in the National Cancer Institute at the University of Gezira, in Gezira State, Sudan, in 1999-2012

Gasmelseed, Nagla,Abudris, Daffalla,Elhaj, Ahmed,Eltayeb, Elgaylani A,Elmadani, Ahmed,Elhassan, Moawia M,Mohammed, Khadiga,Elgaili, Elgaili M,Elbalal, Moawia,Schuz, Joachim,Leon, Maria E Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Background: Esophageal cancer (EC) is among the most common malignancies in Eastern Africa, but the occurrence of EC in Sudan has rarely been described in the scientific literature. This paper reports the results of a consecutive case series of all EC patients who visited one of the two public cancer treatment centers in the country in 1999-2012, providing a first description of this disease in a treatment center located in central Sudan. Materials and Methods: Clinical and demographic data for all EC patients who visited the Department of Oncology of the National Cancer Institute at the University of Gezira (NCI-UG) from 1999 to the end of 2012 were abstracted and tabulated by sex, tumor type and other characteristics. Results: A total of 448 EC patients visited NCI-UG in 1999-2012, and the annual number of EC cases increased steadily from 1999. Squamous cell carcinoma (SCC) was the predominant EC tumor type (90%), and adenocarcinoma (ADC) was reported in 9.4% of the EC cases. The overall male-to-female ratio for EC was 1:1.8, but the ratio was tumor type-dependent, being 1:2 for SCC and 2:1 for ADC. Only 20% of EC patients reported having ever used tobacco and/or alcohol, and the vast majority of these patients were male. At the time of EC diagnosis, 47.3% of the patients resided in Gezira State. Some EC patients from Gezira State seek out-of-state treatment in the national capital of Khartoum instead of visiting NCI-UG. Conclusions: The annual number of EC patients visiting NCI-UG has increased in recent years, approximately half of these patients being from Gezira State. Although this consecutive series of EC patients who visited NCI-UG was complete, it did not capture all EC patients from the state. A populationbased cancer registry would provide more complete data required to better understand EC patterns and risk factors.