Volume 55 (2023)
Volume 54 (2022)
Volume 53 (2021)
Volume 52 (2020)
Volume 51 (2019)
Volume 50 (2018)
Volume 49 (2017)
Volume 48 (2016)
Volume 47 (2016)
Volume 46 (2015)
Volume 45 (2014)
Volume 44 (2013)
Volume 43 (2009)
Volume 42 (2008)
Volume 41 (2007)

An improved algorithm to reconstruct a binary tree from its inorder and postorder traversals

Niloofar Aghaieabiane; Henk Koppelaar; Peyman Nasehpour

Volume 49, Issue 1 , June 2017, , Pages 93-113


  It is well-known that, given inorder traversal along with one of the preorder or postorder traversals of a binary tree, the tree can be determined uniquely. Several algorithms have been proposed to reconstruct a binary tree from its inorder and preorder traversals. There is one study to reconstruct a ...  Read More

Minimum Spanning Tree of Imprecise Points Under $L_1$-metric

Amir Mesrikhani; Mohammad Farshi; Behnam Iranfar

Volume 51, Issue 2 , December 2019, , Pages 99-110


  Let $S$ be a set of imprecise points that is represented by axis-aligned pairwise disjoint squares in the plane. A precise instance of $S$ is a set of points, one from each region of $S$. In this paper, we study the optimal minimum spanning tree (\textit{OptMST}) problem on $S$. The \textit{OptMST} problem ...  Read More

Feasibility of detecting and localizing radioactive source using image processing and computational geometry algorithms

Azadeh Sharafibadr; Zahra Nilforoushan

Volume 51, Issue 1 , June 2019, , Pages 107-120


  We consider the problem of finding the localization of radioactive source by using data from a digital camera. In other words, the camera could help us to detect the direction of radioactive rays radiation. Therefore, the outcome could be used to command a robot to move toward the true direction to achieve ...  Read More

Vibration Analysis of Global Near-regular Mechanical Systems

Iman Shojaei; Hossein Rahami

Volume 49, Issue 2 , December 2017, , Pages 113-118


  Some near-regular mechanical systems involve global deviations from their corresponding regular system. Despite extensive research on vibration analysis (eigensolution) of regular and local near-regular mechanical systems, the literature on vibration analysis of global near-regular mechanical systems ...  Read More

Sign Test for Fuzzy Random Variables

Mehdi Shams; Gholamreza Hesamian

Volume 50, issue 2 , December 2018, , Pages 121-139


  This paper extends the sign test to the case where data are observations of fuzzy random variables, and the hypotheses are imprecise rather than crisp. In this approach, first a new notion of fuzzy random variables is introduced. Then, the $\alpha$-level sets of the imprecise observations are transacted ...  Read More

Total vertex irregularity strength of corona product of some graphs

P. Jeyanthi; A. Sudha

Volume 48, Issue 1 , December 2016, , Pages 127-140


  A vertex irregular total k-labeling of a graph G with vertex set V and edge set E is an assignment of positive integer labels {1, 2, ..., k} to both vertices and edges so that the weights calculated at vertices are distinct. The total vertex irregularity strength of G, denoted by tvs(G)is the minimum ...  Read More

ﺑﺮﺭﺳﻲ ﺍﺛﺮ ﻋﻤﻠﻴﺎﺕ ﺣﺮﺍﺭﺗﻲ ﻣﺤﻠﻮﻝ ﺳﺎﺯﻱ ﺑﺮ ﺭﻳﺰﺳﺎﺧﺘﺎﺭ ﻭ ﺧﻮﺍﺹ ﺳﺎﻳﺸﻲ ﺁﻟﻴﺎﮊ ﺁﻟﻮﻣﻴﻨﻴﻢ ۳۳۲

Akbar Eshaghi; Jafar Raiszadeh; Hamid Reza Ghasemi; Reza Taghiabadi

Volume 43, Issue 2 , July 2009, , Pages 139-148


  The effect of T6 heat treatment on the microstructure and wear behavior of Al-332 piston alloy containing 1.2wt% iron was investigated. The results showed that the T6 heat treatment changed the morphology of acicular eutectic Si particles to a more spherical form. The heat treatment also reduced the ...  Read More

$k$-Total prime cordial labeling of graphs

R Ponraj; J Maruthamani; R Kala

Volume 50, Issue 1 , June 2018, , Pages 143-149


  In this paper we introduce a new graph labeling method called $k$-Total prime cordial. Let $G$ be a $(p,q)$ graph. Let $f:V(G)\to\{1,2, \ldots, k\}$ be a map where $k \in \mathbb{N}$ and $k>1$. For each edge $uv$, assign the label $gcd(f(u),f(v))$. $f$ is called $k$-Total prime cordial labeling of ...  Read More

(افزایش مقاومت خمشی کامپوزیتها توسط کشش الیاف (یادداشت فنی

Siamak Motahhari

Volume 42, Issue 2 , May 2008, , Pages 249-255


  In the present research work, the flexural modulus and strength of glass fiber-epoxy resin and carbon fiber-epoxy resin composites have been enhanced through fiber tension during curing of the polymeric resin. This study showed that the tension applied on the fibers increased the flexural modulus of ...  Read More

(به‌کارگیری رهیافت نیومارک برای تحلیل آسیب‌پذیری و ریسک زمین‌لرزه در معادن روباز (مطالعه موردی: معدن مس سرچشمه

Majid Meybodian; Hossein Memarian; Mehdi Zare

Volume 43, Issue 3 , September 2009, , Pages 325-336


  Sarcheshmeh copper mine, with the final reserves of 828 million tons of sulfur ore and average grade of 0.74%, is known to be the largest open pit of Iran and most probably the second largest copper mine in the world. This mine is located in the seismotectonic zone of Central-Iran, and 23 Km away from ...  Read More

چگونگی تاثیر ابعاد نمونه بر ویژگی های الاستیک دینامیک سنگ

Mohammad Farough Hosseini; Soroush Fouladchi; Mojtaba Ganji

Volume 41, Issue 3 , September 2007, , Pages 333-342


  Wave propagation is used as an advanced tool of determining elastic properties of rocks. In spite of being cheap and non destructive tests of rock mechanics, due to its modernity method is not yet replacing the traditional dear and destructive tests. In order to pave ways of replacing this test and making ...  Read More

روش‌های تجزیه مقادیر منفرد منقطع و تیخونوف تعمیم‌یافته در پایدارسازی مسئله انتقال به سمت پائین

Ali Reza Azmoude Ardalan; Abdorreza Safari; Yahya Tavakkoli

Volume 43, Issue 4 , September 2009, , Pages 355-368


  The methods applied to regularization of the ill-posed problems can be classified under “direct” and “indirect” methods. Practice has shown that the effects of different regularization techniques on an ill-posed problem are not the same, and as such each ill-posed problem requires its own investigation ...  Read More

استفاده از POD در استخراج ساختارهای متجانس‌ یک میدان آشفته آماری- همگن

Fereydoun Sabet Ghadam; Vahid Esfahanian; Mohammad Eftekhari Yazdi

Volume 41, Issue 4 , November 2007, , Pages 401-413


  Capability of the Proper Orthogonal Decomposition (POD) method in extraction of the coherent structures from a spatio-temporal chaotic field is assessed in this paper. As the chaotic field, an ensemble of 40 snapshots, obtained from Direct Numerical Simulation (DNS) of the Kuramoto-Sivashinsky (KS) equation, ...  Read More

روشی مبتنی بر تئوری گراف جهت تعیین بهینه جزیره ها در فرآیند بازیابی

Hossein Afrakhteh; Mahmoud Reza Haghifam

Volume 41, Issue 5 , December 2007, , Pages 541-555


  In this paper, effect of the islands number variation in restoration process is investigated and a graph based method for determination of optimum islands boundaries is presented. Also, the effect of number and location of black-start units on the restoration process is evaluated. In optimization process, ...  Read More

تعیین هم زمان تنش سیلان و فاکتور اصطکاک آلومینیوم 7075 به کمک روش تحلیل معکوس

Mohammad Kazem Besharati Givi; Amir Sarvari

Volume 42, Issue 5 , September 2008, , Pages 617-623


  In all engineering applications where solid surfaces slide on each other, friction plays an important role. It becomes even more important, particularly in metal forming processes where the two sliding materials are metallic. Among forming processes, forging is an important process, because of improving ...  Read More

(بررسی فنی و اقتصادی روسازه های بتنی در خطوط راه آهن مسافری (یادداشت فنی

Abolfazl Hassani; Seyyed Hamed Mada'eni

Volume 42, Issue 6 , December 2008, , Pages 705-711


  Ballast as a part of the railway system plays an important role in the operation of the railways and also has a great impact on repair and maintenance activities. Hence most of the repair and maintenance activities in traditional railway systems are due to the defections in the ballast layer and therefore ...  Read More

ضریب اطمینان در تحلیل پایداری شیروانیها تحت‌ اثر بار متمرکز

Ourang Farzaneh; Farajollah Askari

Volume 41, Issue 6 , January 2008, , Pages 765-773


  In this paper, stability of slopes with a shallow foundation located on top including the shape of the failure mechanism is investigated in static and seismic states. This is a three dimensional problem which is analyzed two dimensionally because 3D analyses are complex and appropriate softwares are ...  Read More

زمانبندی دو معیاره در محیط جریان کاری ترکیبی با ماشینهای غیر یکسان

Reza Baradaran Kazemzadeh; Seyyed Hesamoddin Zegardi; Mohammad Ali Beheshti Nia

Volume 41, Issue 7 , February 2009, , Pages 849-861


  This study considers scheduling in Hybrid flow shop environment with unrelated parallel machines for minimizing mean of job's tardiness and mean of job's completion times. This problem does not study in the literature, so far. Flexible flow shop environment is applicable in various industries such as ...  Read More

معرفی روش تطبیقی اصلاح شده برای اندازه‌گیری دقیق ولتاژ در مبدل ولتاژ نوری

Hassan Monsef; Taher Ghomian

Volume 42, Issue 7 , January 2009, , Pages 913-922


  There are fewer problems encountered with optical voltage transducers in comparison with their inductive and capacitive counterparts. Although capacitive and inductive transformers are used vastly for the purpose of measurement and protection in the networks, they cause problems such as core saturation ...  Read More

ررسی تجربی افت فشار جریان جوششی مبرد R-134a در لوله‌های افقی

Mohammad Ali Akhavan Behabadi; Hossein Shokouhmand; Masoud Jamali Ashtiani; Amir Mohammadpour

Volume 42, Issue 1 , April 2008, , Pages 31-38


  The pressure drop of refrigerant R-134a flow boiling inside a horizontal tube has been investigated experimentally. The test set-up which was used in this investigation is a well instrumented vapor compression refrigeration system. These instruments are thermocouples, flow meter, pressure gauges and ...  Read More

A Mathematical Optimization Model for Solving Minimum Ordering Problem with Constraint Analysis and some Generalizations

Samira Rezaei; Amin Ghodousian

Volume 47, Issue 1 , June 2016, , Pages 101-117


  In this paper, a mathematical method is proposed to formulate a generalized ordering problem. This model is formed as a linear optimization model in which some variables are binary. The constraints of the problem have been analyzed with the emphasis on the assessment of their importance in the formulation. ...  Read More