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Search Results: 1 - 10 of 3260 matches for " Masud Hasan "
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Characterizing Graphs of Zonohedra
Muhammad Abdullah Adnan,Masud Hasan
Computer Science , 2008,
Abstract: A classic theorem by Steinitz states that a graph G is realizable by a convex polyhedron if and only if G is 3-connected planar. Zonohedra are an important subclass of convex polyhedra having the property that the faces of a zonohedron are parallelograms and are in parallel pairs. In this paper we give characterization of graphs of zonohedra. We also give a linear time algorithm to recognize such a graph. In our quest for finding the algorithm, we prove that in a zonohedron P both the number of zones and the number of faces in each zone is O(square root{n}), where n is the number of vertices of P.
An Approximation Algorithm for Bounded Degree Closest Phylogenetic 2nd Root Problem
Swakkhar Shatabda,Atif Rahman,Masud Hasan
Lecture Notes in Engineering and Computer Science , 2008,
On the Design and Analysis of Quaternary Serial and Parallel Adders
Anindya Das,Ifat Jahangir,Masud Hasan
Computer Science , 2010,
Abstract: Optimization techniques for decreasing the time and area of adder circuits have been extensively studied for years mostly in binary logic system. In this paper, we provide the necessary equations required to design a full adder in quaternary logic system. We develop the equations for single-stage parallel adder which works as a carry look-ahead adder. We also provide the design of a logarithmic stage parallel adder which can compute the carries within log2(n) time delay for n qudits. At last, we compare the designs and finally propose a hybrid adder which combines the advantages of serial and parallel adder.
Formulation and Development of a Novel Quaternary Algebra
Ifat Jahangir,Anindya Das,Masud Hasan
Computer Science , 2011,
Abstract: In this work, a novel quaternary algebra has been proposed that can be used to implement any quaternary logic function. Unlike other variants of quaternary algebra, this algebra is closely related to Boolean algebra and can be used to convert any binary function into quaternary without any significant modification. For this purpose, we have defined a set of quaternary operators and developed two ways to express any quaternary function mathematically. Finally, we have presented the design of several combinational logic circuits and compared these designs with several other variants of quaternary logic. Since a quaternary digit can contain as much information as a pair of binary digits, this new logic may be quite useful in the fields of communication and computing.
Irritable bowel syndrome in a Bangladeshi urban community: Prevalence and health care seeking pattern
Perveen Irin,Hasan Mahmud,Masud Mohammed,Bhuiyan Mohammed
Saudi Journal of Gastroenterology , 2009,
Abstract: Background/Aims : Although irritable bowel syndrome (IBS) is a common gastrointestinal disorder, its prevalence is unknown, especially in the urban population of Bangladesh. This community-based study aimed to find out the prevalence of IBS and healthcare-seeking patterns using the Rome-II definition. Materials and Methods : A population-based cross-sectional survey of 1503 persons aged 15 years and above was carried out in an urban community of Bangladesh. The subjects were interviewed using a valid questionnaire based on Rome-II criteria in a home setting. Statistical analysis was performed with Statistical Package for Social Science (SPSS) Programmers and the level of significance was set at P ≤ 0.05. Results : A response rate of 97.2% yielded 1503 questionnaires for analysis. The prevalence of IBS was found to be 7.7% (n = 116) with a male to female ratio of 1:1.36 (49 vs. 67). "Diarrhoea-predominant IBS" (50%, n = 58) was the predominant IBS subgroup. Symptoms of abdominal pain associated with a change in stool frequency (100%) and consistency (88.8%) were quite common. All IBS symptoms were more prevalent among women (P < 0.000). In the past one year, 65.5% (n = 76) IBS subjects had consulted a physician with a slightly higher rate of women consulters (68.6 vs. 61.2%). The main predictor for healthcare-seeking was the presence of multiple dyspeptic symptoms. Conclusions : The prevalence of IBS in the urban community was found to be similar to that in rural communities. A higher rate of consultation was found among urban IBS subjects than in the rural subjects, with sex not seen to be a discriminator to seek consultation.
Cutting a Cornered Convex Polygon Out of a Circle
Syed Ishtiaque Ahmed,Md. Ariful Islam,Masud Hasan
Journal of Computers , 2010, DOI: 10.4304/jcp.5.1.4-11
Abstract: The problem of cutting a convex polygon P out of a piece of planar material Q with minimum total cutting length is a well studied problem in computational geometry. Researchers studied several variations of the problem, such as P and Q are convex or non-convex polygons and the cuts are line cuts or ray cuts. In this paper we consider yet another variation of the problem where Q is a circle and P is a convex polygon such that P is bounded by a half circle of Q and all the cuts are line cuts. We give two algorithms for solving this problem. Our first algorithm is an O(log n)-approximation algorithm with O(n) running time, where n is the number of edges of P. The second algorithm is a constant factor approximation algorithm with approximation ratio 6.48 and running time O(n3).
An $O(n^2)$ Algorithm for Computing Longest Common Cyclic Subsequence
Shihabur Rahman Chowdhury,Masud Hasan,Sumaiya Iqbal,M. Sohel Rahman
Computer Science , 2009,
Abstract: The {\em longest common subsequence (LCS)} problem is a classic and well-studied problem in computer science. LCS is a central problem in stringology and finds broad applications in text compression, error-detecting codes and biological sequence comparison. However, in numerous contexts, words represent cyclic sequences of symbols and LCS must be generalized to consider all circular shifts of the strings. This occurs especially in computational biology when genetic material is sequenced form circular DNA or RNA molecules. This initiates the problem of {\em longest common cyclic subsequence (LCCS)} which finds the longest subsequence between all circular shifts of two strings. In this paper, we give an $O(n^2)$ algorithm for solving LCCS problem where $n$ is the number of symbols in the strings.
Cutting a Convex Polyhedron Out of a Sphere
Syed Ishtiaque Ahmed,Masud Hasan,Md. Ariful Islam
Computer Science , 2009,
Abstract: Given a convex polyhedron $P$ of $n$ vertices inside a sphere $Q$, we give an $O(n^3)$-time algorithm that cuts $P$ out of $Q$ by using guillotine cuts and has cutting cost $O((\log n)^2)$ times the optimal.
Md Ruhul Amin,Moynul Hasan,Abdullah Al Masud,Md Hanif uddin
Pharmacie Globale : International Journal of Comprehensive Pharmacy , 2011,
Abstract: The objective of this present investigation is to develop a simple, sensitive and accurate spectrophotometric method for the determination of Dutasteride in raw material and tablet dosage form. The λmax of was found to be 241 nm. The linear dynamic response was found to be in the concentration range of 12-28 μg/ml and coefficient of correlation was found to be 0.997. The %RSD value was below 2.0 for intraday and interday precision indicated that the method was highly precise. The LOD and LOQ were found to be 0.125 and 0.345 μg/ml respectively which revealed that method was highly sensitive. The percentage recovery value was higher than 100 %, indicating the accuracy of the method and absence of interference of the excipients present in the tablet formulation. The proposed method was simple, fast, accurate, precise and reproducible and hence can be applied for routine quality control analysis of Dutasteride in bulk and pharmaceutical tablet formulations.
Analysis of Cell Planning and Link Budgeting in WiMAX Communication
Md. Masud Hasan,Kishore Bhowmik,Md. Maruf Ahamed,Md. Shihabul Islam
International Journal of Computer Science Issues , 2012,
Abstract: This thesis is related with the WiMAX (Worldwide Interoperatibility for Microwave Access) technology. Today, different types of cellular networks are actively working on the radio links. For instance, the Global System for Mobile Communication (GSM) is being used in nearly all of the countries of the world and currently it has around three billion users all over the world. Universal Mobile Telecommunication System (UMTS) is currently deployed in many countries and it is providing increased data rates, coverage and mobility as compared to GSM. Wireless Local Area Networks (WLAN) are very famous when we have a small area and none real time services. Worldwide Interoperability for Microwave Access (WiMAX) is a new technology and it is in deployment phase. In all these cellular technologies, we have very limited resources and we have to make best use of them by proper management. Radio Resource Management (RRM) is a control mechanism for the overall system which is being used to manage radio resources in the air interface inside a cellular network. The main objective is to utilize the available spectral resources as efficiently as possible. Our aim is to use them in the best possible way to maximize the performance and spectral efficiency in such a way that we have maximum number of users in our network and Quality of Service (QoS) is up to the mark. In a cellular communication system, a service area or a geographical region is divided into a number of cells and each cell is served by an infrastructure element called the base station which works through a radio interface. The frequency license fees, real estate, distribution network and maintenance are the issues which dominates the cost for deploying a cellular network. In RRM, we control parameters like Radio Frequency (RF) planning, link budgeting, modulation schemes, channel access schemes etc. RF planning includes cell planning, coverage of the network and capacity of the network. Our main focus in this thesis will be on cell planning and link budgeting and we will discuss them in context of a WiMAX network.
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