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Playbook: An animation-based game for improving children's creativity and problem solving skills
, Article 13th ACM SIGCHI Symposium on Engineering Interactive Computing Systems, EICS 2021, 8 June 2021 through 11 June 2021 ; 2021 , Pages 12-16 ; 9781450384490 (ISBN) ; Habibi, J ; Baghaei, N ; Sharif University of Technology
Association for Computing Machinery, Inc
2021
Abstract
In this paper, we describe the design, development and preliminary evaluation of a novel animation tool for smartphones and tablets, with the goal of improving creativity and problem-solving ability among novice users, mainly young children. The user first draws the objects with markers and crayons on paper and takes a photo with their mobile or tablet to import their drawings into the app as game sprites. They then design their animation scene and point to a part of the character and selecting its animation type from existing buttons. Hence the selected part is animated in a vertex shader while ensuring a smooth transition with the non-pointed part. The results of a preliminary evaluation...
Prediction of effect of thermo-mechanical parameters on mechanical properties and anisotropy of aluminum alloy AA3004 using artificial neural network
, Article Materials and Design ; Volume 28, Issue 5 , 2007 , Pages 1678-1684 ; 02613069 (ISSN) ; Akbarzadeh, A ; Sharif University of Technology
Elsevier Ltd
2007
Abstract
An artificial neural network model, using a back-propagation learning algorithm is utilized, to predict the yield stress, elongation, ultimate tension stress, over(R, -) and {divides}ΔR{divides} during hot rolling, cold rolling and annealing of AA3004 aluminum alloy. Input nodes were chosen as the ratio of initial to final thicknesses, reduction, preheating time and temperature, finish rolling temperature and the final annealing temperature. The maximum error for predicted values was 6.35%, the average of absolute relative error was 0.57% and the RMS was 0.00998. It was found that the mechanical properties and anisotropy of AA3004 alloy sheets can be predicted by this approach. © 2006...
Ultrasonic-Assisted Drilling of Glass Fiber Reinforced Composites
, M.Sc. Thesis Sharif University of Technology ; Akbari, Javad (Supervisor)
Abstract
The fiber-reinforced composite materials possess advantage for structural purpose in various industries. Delamination is recognized as one of the major causes of damage during drilling of fiber reinforced composites, which not only reduces the structural integrity, but also has the potential for long-term performance deterioration. It is difficult to produce precise quality holes with high efficiency by conventional drilling method. Drilling is frequently applied in production cycle while the anisotropy and nonhomogeneity of composite materials affect the chip deformation and machining behavior during drilling. In this thesis, a new non-traditional drilling technology is presented for solve...
Tree-dimensional Free Vibration of Nano-Composite Plates with Arbitrary Geometry within Couple Stress Theory
, M.Sc. Thesis Sharif University of Technology ; Mohammadi Shoja, Hossein (Supervisor)
Abstract
Based on Hamilton’s principle, a three-dimensional semi-analytical method for the analysis of free vibration of a nano-composite plate within the couple stress theory is developed. Computation of dynamic behavior as well as natural frequencies and mode shapes is interested. In this method, the mechanical displacement functions, in each layer, are defined as product of a base function and a three-dimensional polynomial with unknown coefficients. The base functions are defined with respect to the kinematical boundary condition and the domain geometry. The mode shapes will be obtained and the accuracy of the present approach is demonstrated by comparison it in both classical elasticity and...
Three-dimensional free vibration of arbitrarily shaped laminated micro-plates with sliding interfaces within couple stress theory
, Article Journal of Sound and Vibration ; Volume 339 , March , 2015 , Pages 176-195 ; 0022460X (ISSN) ; Shodja, H. M ; Forouzan, B ; Sharif University of Technology
Academic Press
2015
Abstract
Free vibration of laminated micro-plates with arbitrary geometry and boundary conditions consisting of several micro-layers with free sliding/frictional sliding/perfect interfaces is of interest. The inter-layer bond in the direction normal to the interfaces is perfect, and thus the corresponding displacement component is continuous across the interfaces. The mentioned in-plane interface conditions may be realized by varying the stiffness of the sliding inter-layer spring of vanishing thickness. For free sliding and perfect interface conditions the stiffness→0 and a, respectively. Couple stress theory as a useful higher order continuum theory is utilized to formulate the problem....
Frame time-hopping patterns in multirate optical CDMA networks using conventional and multicode schemes
, Article IEEE Transactions on Communications ; Volume 53, Issue 5 , 2005 , Pages 863-875 ; 00906778 (ISSN) ; Nasiri Kenari, M ; Rezaee, N ; Sharif University of Technology
2005
Abstract
A class of generalized optical orthogonal codes (OOCs), namely, frame time-hopping (FTH) patterns with an extremely large cardinality, are studied for implementing multirate and multiservice (MR/MS) optical CDMA (OCDMA) networks. Conventional MR/MS methods, namely variable spreading rate and parallel mapping, are considered. Using FTH patterns, the problem of low OOC code cardinality in conventional MR/MS schemes is removed. Moreover, several new multicode methods, using subcode concatenation scheme, are proposed for MR/MS OCDMA. The proposed multicode schemes present flexibility for supporting MR/MS applications such as lower implementation complexity and cost, less need for service...
Animation–based Gamification of Children
, M.Sc. Thesis Sharif University of Technology ; Habibi, Jafar (Supervisor) ; Hemmatyar, Ali Mohammad Afshin (Supervisor)
Abstract
Creative play is both engaging and educational. Finger painting, building with blocks, drawing, or dressing up – all such activities intimately link imagination and self expression with exploration and problem solving. With creative play, children have fun while learning new skills and enhancing their understanding of the world. However, with the popularity and ubiquity of digital devices, an increasing amount of play time happens in the digital world, such as with video games where the link to creativity is sometimes questionable. Instead of creative play, children simply play. In this thesis, we describe the design, development and preliminary evaluation of a novel animation tool for...
Frame time-hopping fiber-optic code-division multiple access using generalized optical orthogonal codes
, Article IEEE Transactions on Communications ; Volume 50, Issue 12 , 2002 , Pages 1971-1983 ; 00906778 (ISSN) ; Salehi, J. A ; Nasiri Kenari, M ; Sharif University of Technology
2002
Abstract
In this paper, a new spreading technique for intensity modulation direct detection fiber-optic code-division multiple-access (FO-CDMA) communication systems is proposed. This new spreading technique is based on generalized optical orthogonal codes (OOC) with large cardinality and minimal degradation in performance when compared with a more optimum system, namely, an optical CDMA system using OOC with autocorrelation and cross-correlation value bounded by one, i.e., OOC (λ = 1). To obtain the performance of such systems, we use a recently introduced communication scheme, namely, frame time-hopping (FTH)-CDMA with random coding. It is discussed that systems with generalized OOC patterns and...
Performance analysis of time-hopping spread-spectrum multiple-access systems: Uncoded and coded schemes
, Article IEEE Transactions on Wireless Communications ; Volume 1, Issue 4 , 2002 , Pages 671-681 ; 15361276 (ISSN) ; Nasiri Kenari, M ; Salehi, J. A ; Sharif University of Technology
2002
Abstract
In [Scholtz (1993)], an ultra-wide bandwidth time-hopping spread-spectrum code division multiple-access system employing a binary PPM signaling has been introduced, and its performance was obtained based on a Gaussian distribution assumption for the multiple-access interference. In this paper, we begin first by proposing to use a practical low-rate error correcting code in the system without any further required bandwidth expansion. We then present a more precise performance analysis of the system for both coded and uncoded schemes. Our analysis shows that the Gaussian assumption is not accurate for predicting bit error rates at high data transmission rates for the uncoded scheme....
Low-rate convolutionally encoded time-hopping spread spectrum multiple access systems
, Article 11th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2000), London, 18 September 2000 through 21 September 2000 ; Volume 2 , 2000 , Pages 1555-1558 ; Nasiri Kenari, M ; Salehi, J. A ; Sharif University of Technology
2000
Abstract
In this paper, we propose to use a practical low rate error-correcting code in a time-hopping spread spectrum multiple access system employing a binary PPM signaling. To this end, superorthogonal codes, which are near optimal and have relatively low implementation complexity, are considered. The performance analysis shows that the proposed coded scheme outperforms the uncoded scheme significantly, or more importantly, at a given bit error rate the proposed scheme increases the number of users by a factor which is logarithmic in the number of pulses used in time hopping spread spectrum system
Performance analysis of ultrawideband time-hopping code division multiple access systems: Uncoded and coded schemes
, Article International Conference on Communications (ICC2001), Helsinki, 11 June 2000 through 14 June 2000 ; Volume 10 , 2001 , Pages 3017-3021 ; 05361486 (ISSN) ; Nasiri Kenari, M ; Salehi, J. A ; Sharif University of Technology
2001
Abstract
In [1], an ultra-wide bandwidth time-hopping spread-spectrum code division multiple access system employing a binary PPM signaling has been introduced, and its performance was obtained based on a Gaussian distribution assumption for the multiple access interference. A coded scheme of this system has been proposed in [2], which shows much better performance in comparison to the uncoded scheme under the above Gaussian assumption. In this paper, we present a more precise performance analysis of the system for both coded and uncoded schemes. Our analysis shows that the Gaussian assumption is not accurate for predicting bit error rates at high data transmission rates