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( Rahim,Medhat H ),( Siddo Radcliffe A ) 한국수학교육학회 2012 수학교육연구 Vol.16 No.2
A group of twenty-nine high school student-teachers were given a set of mathematical propositions focusing on shape-to-shape transformations. Their task was to determine through hands-on manipulation and use of dynamic software that each shape be transformed into an area equivalent rectangular region. This paper reports on a classroom-based research.
Probabilistic-based damage identification based on error functions with an autofocusing feature
Rahim Gorgin,Yunlong Ma,Zhanjun Wu,Dongyue Gao,Yishou Wang 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.4
This study presents probabilistic-based damage identification technique for highlightingdamage in metallic structures. This technique utilizes distributed piezoelectric transducers to generate andmonitor the ultrasonic Lamb wave with narrowband frequency. Diagnostic signals were used to define thescatter signals of different paths. The energy of scatter signals till different times were calculated by takingroot mean square of the scatter signals. For each pair of parallel paths an error function based on the energyof scatter signals is introduced. The resultant error function then is used to estimate the probability of thepresence of damage in the monitoring area. The presented method with an autofocusing feature is applied toaluminum plates for method verification. The results identified using both simulation and experimentalLamb wave signals at different central frequencies agreed well with the actual situations, demonstrating thepotential of the presented algorithm for identification of damage in metallic structures. An obvious merit ofthe presented technique is that in addition to damages located inside the region between transducers; thosewho are outside this region can also be monitored without any interpretation of signals. This noveltyqualifies this method for online structural health monitoring.
Rahim, Md Abdur,Afrin, Khandker Shazia,Jung, Hee-Jeong,Kim, Hoy-Taek,Park, Jong-In,Hur, Yoonkang,Nou, Ill-Sup National Research Council of Canada, Conseil natio 2019 Genome Vol. No.
<P> Broccoli <I>(Brassica oleracea var. italica L.)</I> is a highly nutritious vegetable that typically forms pure green or purple florets. However, green broccoli florets sometimes accumulate slight purplish pigmentation in response environmental factors, decreasing their market value. In the present study, we aimed to develop molecular markers to distinguish broccoli genotypes as pure green or purplish floret color at the early seedling stage. Anthocyanins are known to be involved in the purple pigmentation in plants. The purplish broccoli lines were shown to accumulate purple pigmentation in the hypocotyls of very young seedlings; therefore, the expression profiles of the structural and regulatory genes of anthocyanin biosynthesis were analyzed in the hypocotyls using <I>qRT-PCR. BoPAL, BoDFR, BoMYB114, BoTT8, BoMYC1.1, BoMYC1.2,</I> and <I>BoTTG1</I> were identified as putative candidate genes responsible for the purple hypocotyl color. <I>BoTT8</I> was much more highly expressed in the purple than green hypocotyls; therefore, it was cloned and sequenced from various broccoli lines, revealing SNP and InDel variations between these genotypes. We tested four SNPs (G > A; A > T; G > C; T > G) in the first three exons and a 14-bp InDel (ATATTTATATATAT) in the <I>BoTT8</I> promoter in 51 broccoli genotypes, and we found these genetic variations could distinguish the green lines, purple lines, and F<SUB>1</SUB> hybrids. These novel molecular markers could be useful in broccoli breeding programs to develop a true green or purple broccoli cultivar. </P>
( Rahim Golmohammadi ),( Mohammad J Namazi ),( Mehdi Nikbakht ),( Mohammad Salehi ),( Mohammad H Derakhshan ) The Editorial Office of Gut and Liver 2013 Gut and Liver Vol.7 No.3
Background/Aims: We aimed to investigate the relationships among various mutations of the p53 gene and their protein products, histological characteristics, and disease prognosis of primary colorectal cancer in Isfahan, central Iran. Methods: Sixty-one patients with colorectal adenocarcinoma were enrolled in the study. Mutations of the p53 gene were detected by single-stranded conformation polymorphism and DNA sequencing. The protein stability was evaluated by immunohistochemistry. Patients were followed up to 48 months. Results: Twenty-one point mutations in exons 5 and 6 were detected in the tumor specimens of 14 patients (23%). Of those, 81% and 9.5% were missense and nonsense mutations, respectively. There were also two novel mutations in the intronic region between exons 5 and 6. In 11 mutated specimens, protein stability and protein accumulation were identified. There was a relationship between the type of mutation and protein accumulation in exons 5 and 6 of the p53 gene. The presence of the mutation was associated with an advanced stage of cancer (trend, p<0.009). Patients with mutated p53 genes had significantly lower survival rates than those with wild type p53 genes (p<0.01). Conclusions: Mutations in exons 5 and 6 of the p53 gene are common genetic alterations in colorectal adenocarcinoma in central Iran and are associated with a poor prognosis of the disease. (Gut Liver 2013; 7:295-302)
Rahim Khan,Shah Nawaz Khan,Mushtaq Ahmad 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, we propose a routing technique that takes into account the importance of a particular node for the overall network connectivity for routing. We show that some nodes are more important than others and need to be used sporadically for data forwarding. Avoiding the use of such important nodes results in prolonging network lifetime and maximizing the data transfer. Simulation results are shown to confirm the effectiveness of the proposed technique.
Patterns for Development of Windows Form Applications and Web Applications
Rahim Lotfi 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.6
Design pattern is a mechanism to show experience in object-oriented design, as well as an appropriate solution which has been provided by experts for particular problems and which can be used over and over throughout the design. Using design patterns helps improve software quality and reusability. There are different patterns for development of data source (database, file, array, etc.) systems but most of them have features that are not appropriate for code generation. We seek in this research new patterns for development of data source systems that can accelerate the development of such systems and reduce costs and are appropriate for code generation as well. This article deals with challenges related to prototype, singleton and MV* (MVC, MVP, MVVM) patterns. As a solution, we will propose two patterns called MVC+ and MVC++ as well as a tool called LCG for code generation. We compare the proposed patterns with similar patterns in terms of efficiency. MVC+ and MVC++ are appropriate for model-driven architecture, code generation and the development of windows form applications and web applications.
Large eddy simulation of flow around two side-by-side spheres
Rahim Hassanzadeh,Besir Sahin,Muammer Ozgoren 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7
Large eddy simulation, using a dynamic Smagorinsky sub-grid scale, is used for the prediction of flow structures around two identical spheres fixed side-by-side at a subcritical flow regime with the Reynolds number equal to 5,000. The QUICK discretization method is applied to discretize the convection terms of the Navier-Stokes equation by means of the finite volume approach. This work focuses mainly on the wake structures downstream of the two interactive spheres located at three various dimensionless separation distances between spheres such as G/D = 1.50, 2.00, and 3.00. The obtained results revealed that the interaction between wakes affects the flow structures downstream of spheres. The rate of this interaction is strongly altered as a function of separation distance. On the other hand,some flow data such as mean drag and mean lift coefficients are affected due to the wake interactions. Finally, examination of the Reynolds stress variation along the different lateral axis, L/D, revealed that the nozzle effect does not play a significant role on the turbulence characteristics beyond the G/D = 3.00.
Rahim Sabbaghizadeh,Mansor Hashim,Sasan Moraddeh 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.3
Melt-spun ribbons with nominal composition of Nd6Pr1Fe76B12Ti4C1 have been prepared at different quenching wheel speeds (5, 7.5, 10 and 15 m/s) and investigated for microstructural and magnetic properties. The asspun ribbons were examined by using x-ray diffractometry (XRD) with Cu-kα radiation and differential scanning calorimetry (DSC) and vibrating sample magnetometry (VSM). Based on the results obtained, it was shown that the lower speeds increased the magnetic properties. Hence, a uniform Nd2Fe14B/Fe3B nanocomposite structure with fine soft grains can be developed at an optimum quenching wheel speed of about 5 m/s. Further,it is seen that the higher quenching wheel speed leads to a lower grain size and higher amorphous phase amount.
Rahim Jan,AMIR HABIB,Iftikhar Hussain Gul 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.1
In this study, graphene nanosheets (GNS) prepared through a liquid exfoliationtechnique are dispersed in thermoplastic polyurethane (TPU) at a volume fraction(Vf) of up to 0.19. Then, the electrical and mechanical properties of the obtainedcomposites are characterized. The dielectric spectroscopy shows an excessivevariation in dielectric constant (1.1 to 3.53 × 107) and dielectric tangent loss (0.03to 2515) with varying Vf over the frequency range of 25 kHz to 5 MHz. Aconsiderable enhancement in electrical conductivity (DC) is found, from3.87 × 10−10 S/m (base polymer) to 53.5 S/m for the 0.19 Vf GNS-TPUnanocomposite. The GNS-TPU composites are mechanically robust, with aconsiderable increase in stiffness (~4-fold) and strength (almost twice),maintaining its ductility up to 0.09 Vf GNS. The high dielectric constant at lowerfrequencies is attributed to the well-established Maxwell-Wagner polarizationeffect, whereas the high dielectric tangent loss is due to leakage currents as aphysical conducting network is formed at high filler loadings. The layeredstructure, high aspect ratio, and improved dispersion of GNS are the main reasonsfor the improvement in both the dielectric characteristics and the mechanicalproperties of the host polymer.