http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Analysis of Covert Hardware Attacks
Samer Moein,Fayez Gebali,Issa Traore 한국정보기술융합학회 2014 JoC Vol.5 No.3
Current embedded system, such as cell phones and smart-cards, in corporate security devices or cryptographic processor. These cryptographic devices often store private keys or other sensitive data, so compromise of this data or the underlying hardware may lead to loss of privacy, forged access, or monetary theft. Even if the attackers fail to gain the secret information that is stored in a hardware, they may be able to disrupt the hardware or deny service leading to other kinds of security failures in the system. Therefore hardware attacks targets this security devices. Hardware attacks could be covert or overt based on awareness of the targeted system. This paper reviews proposed Accessibility/Resources/Time (ART) schema that quantifies hardware attacks. We focus in this paper on presenting covert attacks and quantify the attack using the ART schema.
The Motion Planning of the Hyper-Redundant Manipulators
Samer Yahya,Haider A. F. Mohammad,S. S. Yang 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Efficient control of industrial robots is an important issue to the success of industrial automation. The motion planning of robot manipulators is one of the challenging problems encountered in this field. A new method for the motion planning is presented in this paper. The basic idea is to find a smooth path consisting of points close enough to each other. Then the computation of the inverse kinematics for these points is accomplished with the help of a geometrical method to solve the problem of multi-solution caused by redundancy. This geometrical method finds one optimal solution to the inverse kinematics of redundant or hyper redundant manipulators from these infinite solutions with fewer computations. This method can be used for any planar n-serial manipulators. Experiments are conducted on a 4-links hyper-redundant manipulator to demonstrate the effectiveness of this proposed method.
Shear strength of steel beams with trapezoidal corrugated webs using regression analysis
Samer Barakat,Ahmad Al Mansouri,Salah Altoubat 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.3
This work attempts to implement multiple regression analysis (MRA) for modeling and predicting the shear buckling strength of a steel beam with corrugated web. It was recognized from theoretical and experimental results that the shear buckling strength of a steel beam with corrugated web is complicated and affected by several parameters. A model that predicts the shear strength of a steel beam with corrugated web with reasonable accuracy was sought. To that end, a total of 93 experimental data points were collected from different sources. Then mathematical models for the key response parameter (shear buckling strength of a steel beam with corrugated web) were established via MRA in terms of different input geometric, loading and materials parameters. Results indicate that, with a minimal processing of data, MRA could accurately predict the shear buckling strength of a steel beam with corrugated web within a 95% confidence interval, having an <i>R</i><sup>2</sup> value of 0.93 and passing the F- and t-tests.
The Effect of Mechanical or Electrical Stimulation on Apnea Length in Mice
Samer Bou Jawde,Alexandra Scheuermann,Erzse´bet Bartola´k-Suki,Be´ la Suki 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.3
Premature birth is a leading cause of infant mortality which is often attributed to irregular breathing and apnea ofprematurity. A common treatment for apnea is caffeine to stimulate the brain’s respiratory center. However, caffeine’s longterm effect on infant development is not fully comprehended. We hypothesized that noninvasive localized body stimulationregularizes breathing pattern. We investigated the impact of electrical or mechanical stimulation on breathing in mice. After the mice were ventilated for 28 s to induce apnea, mice were taken off the ventilator while receiving mechanical,electrical, or no stimulation in a randomized order. Both stimuli targeted the diaphragm area through a custom-built beltwith vibrating motors or adhesive electrodes. After each apnea cycle, the time to take the first breath (T) was recorded. Theelectrical stimulation given at 4.5, 8.3, 16.7 V (pulse rate = 3 Hz, pulse width = 120 μs) showed no reduction in T. Electrical stimulation at pulse rates of 10 or 20 Hz (16.7 V, pulse width 260 μs) showed a detrimental effect increasing Tby ~7% compared to control values (p = 0.005, p = 0.038 respectively). High and medium intensity mechanical stimulationssignificantly reduced T by 11.74 (p<10-13) and by 17.08% (p<10-8), respectively. Further reducing theamplitude of vibrations did not affect T. When the probe was attached to the ankles, only the high intensity vibrationsresulted in a decrease in T (p<10-13). Mechanical vibrations, applied at various intensities and locations, could be used totreat irregular breathing and apnea in infants. Electrical stimulation at pulse rates of 10 or 20 Hz (16.7 V, pulse width 260 ls) showed a detrimental effect increasing Tby * 7% compared to control values (p = 0.005, p = 0.038 respectively). High and medium intensity mechanical stimulationssignificantly reduced T by 11.74 (p\10-13) and by 17.08% (p\10-8), respectively. Further reducing theamplitude of vibrations did not affect T. When the probe was attached to the ankles, only the high intensity vibrationsresulted in a decrease in T (p\10-13). Mechanical vibrations, applied at various intensities and locations, could be used totreat irregular breathing and apnea in infants. Premature birth is a leading cause of infant mortality which is often attributed to irregular breathing and apnea ofprematurity. A common treatment for apnea is caffeine to stimulate the brain’s respiratory center. However, caffeine’s longterm effect on infant development is not fully comprehended. We hypothesized that noninvasive localized body stimulationregularizes breathing pattern. We investigated the impact of electrical or mechanical stimulation on breathing in mice. After the mice were ventilated for 28 s to induce apnea, mice were taken off the ventilator while receiving mechanical,electrical, or no stimulation in a randomized order. Both stimuli targeted the diaphragm area through a custom-built beltwith vibrating motors or adhesive electrodes. After each apnea cycle, the time to take the first breath (T) was recorded. Theelectrical stimulation given at 4.5, 8.3, 16.7 V (pulse rate = 3 Hz, pulse width = 120 μs) showed no reduction in T. Electrical stimulation at pulse rates of 10 or 20 Hz (16.7 V, pulse width 260 μs) showed a detrimental effect increasing Tby ~7% compared to control values (p = 0.005, p = 0.038 respectively). High and medium intensity mechanical stimulationssignificantly reduced T by 11.74 (p<10-13) and by 17.08% (p<10-8), respectively. Further reducing theamplitude of vibrations did not affect T. When the probe was attached to the ankles, only the high intensity vibrationsresulted in a decrease in T (p<10-13). Mechanical vibrations, applied at various intensities and locations, could be used totreat irregular breathing and apnea in infants.
Samer Mudalal 한국축산식품학회 2019 한국축산식품학회지 Vol.39 No.3
The aim of this study is to evaluate the incidence of white striping abnormality and its consequences on the quality traits of raw and processed turkey breast (chemical composition, color traits, and water holding capacity). In total, about 2300 breasts from 22 flocks were used to assess the incidence and 60 breasts to evaluate the quality traits. Our study showed that the total incidence of moderate and severe white striping was 61.3% out of them, moderate cases were 49.4%. Severe white striped turkey breast exhibited significantly lower protein content (21.1 vs. 23.2 and 23.16%, p<0.05) and higher fat content (2.3 vs. 0.77 and 1.76%, p<0.05) if compared to normal and moderate white striped breast respectively. Moreover, moderate and severe white striped meat showed significantly higher redness (a*) (2.98 and 3.14 vs. 1.48, p<0.05) and yellowness (b*) indexes (7.27 and 7.95 vs. 4.05, p<0.05) than normal meat, respectively.
Soft ω-Continuity and Soft ωs-Continuity in Soft Topological Spaces
Samer Al Ghour 한국지능시스템학회 2022 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.22 No.2
In this study, soft ω-continuity and soft ωs-continuity are introduced as two new classes ofsoft functions, and several characterizations of these concepts are given. It is proven that softω-continuity is weaker than soft continuity and that soft ωs-continuity lies strictly between softω-continuity and soft semi-continuity. Sufficient conditions are introduced for the equivalencebetween soft ωs-continuity and soft ω-continuity, as well as that between soft ωs-continuityand soft semi-continuity. Furthermore, composition theorems regarding soft ω-continuity andsoft ωs-continuity are given. Finally, the relationships between the generated soft topologicalspaces and induced topological spaces are studied.
Samer Younes,Dania Awad,Elias Kassab,Martina Haack,Claudia Schuler,Norbert Mehlmer,Thomas Brueck 한국생물공학회 2021 Biotechnology and Bioprocess Engineering Vol.26 No.4
The monomer, 3-hydroxybutyrate (3HB), plays an interesting role as a precursor for antibiotics, vitamins, and bioplastics such as polyhydroxybutyrates (PHB). The biotechnological production of both compounds in Escherichia coli has seen increased interest in the last decade. The central metabolite in the 3HB production pathway is acetyl-CoA, the derivative of coenzyme A (CoA). Enriching the intracellular pool of these cofactors could improve 3HB titers. In our study, we opted to increase CoA titers by upregulating pantothenate kinase (PanK), the rate limiting step in CoA biosynthetic pathway. To this end, 4 PanKs genes of different taxonomic origins (mammalian, fungal, and bacterial) were individually expressed and evaluated in 3HB producing E. coli cells. In shake flask studies, strains expressing Aspergillus nidulans PankII and Mus musculus PanK1β achieved the highest 3HB titers. In a bioreactor fermentation, the strain harboring murine PanK1β resulted in 7.6 g/L compared to 5.4 g/L of 3HB in the control strain. Although structurally different from the bacterial PankI, our study showed that eukaryotic Panks can supplement the kinase activity in prokaryotes. Expressing the exogenous PanKs offer several advantages over the host’s enzyme; PanKII is only inhibited by acetyl- CoA, for which the 3HB-production system would provide a constant metabolic sink. Additionally, PanK1β is weakly regulated by acetyl-CoA, and its activity is stimulated by free CoA. Overexpressing eukaryotic PanKs constitutes a suitable strategy for improving 3HB titers in E. coli.
Samer Mudala,Ahmed Zaazaa 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.3
The aim of this study was to assess the occurrence of white striping (WS), wooden breast (WB), and WS combined with WS/WB muscle abnormalities in broilers (Ross 500) at different slaughter ages (34, 41, and 48 d). In addition, the influence of these muscle abnormalities at different slaughter ages on quality characteristics (physical dimensions, pH, color index, and chemical composition) was studied. Overall occurrence of muscle abnormalities was 45%, 92%, and 100% at slaughter ages of 34, 41, and 48 d, respectively. It was found that about 39% from the occurrence of muscle abnormalities was not similar in the same bird (left and right fillets). Breast fillets affected by muscle abnormalities had significantly (p<0.05) higher weight than normal fillets. At slaughter age of 34 d, normal fillets had significantly higher L* (67.37 vs. 61.73 and 63.05, p<0.05), lower a* (3.25 vs. 4.87 and 5.18, p<0.05) and b* (4.02 vs. 5.20 and 5.99, p<0.05) than WS and WS combined with WB fillets; respectively. The changes in chemical composition due to muscle abnormalities were more significant at high slaughter age than at low slaughter age. In conclusion, the occurrence of muscle abnormalities was strongly influenced by slaughter age. Moreover, breast fillets affected by muscle abnormalities had different quality characteristics (proximate composition, color traits, and dimensions) in comparison to normal fillets.
Soft ω*-Paracompactness in Soft Topological Spaces
Samer Al Ghour 한국지능시스템학회 2021 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.21 No.1
In this study, we introduce a new concept in soft topological spaces, namely, soft ω-paracompactness, and we provide characterizations thereof. Its connection with other related concepts is also studied. In particular, we show that soft ω*-paracompactness and soft paracompactness are independent of each other. In addition, we study the soft ω*-paracompactness of the soft topological space generated by an indexed family of ω*-paracompact topological spaces.