Density

Open Access Article

1 - Spatial Analysis of Changes of Population Density Pattern under Renewal Actions in Tehran (1996-2011)

This paper contains a comparative study of neighbourhood transformation taking place in different administrative parts of Tehran city in Iran. The way of occupation of different areas of the city show it’s certain economic, social and cultural identity and presents diff More

This paper contains a comparative study of neighbourhood transformation taking place in different administrative parts of Tehran city in Iran. The way of occupation of different areas of the city show it’s certain economic, social and cultural identity and presents different landscapes in city. This paper tried to answer this question that how is population density during 1996, 2006 and 2011 in Tehran. This tried to recognize the spatial pattern for population density using ArcGIS, Geoda and techniques of spatial-statistical analysis especially spatial autocorrelation in better way by spatial-temporal investigation. Spatial autocorrelation measures the correlation of a variable with itself through space. The results show that during the three periods of 1996, 2006 & 2011 pattern of population distribution in Tehran has been clustered and has changed during these three periods. Although the intensity and concentration of High-High and Low-Low clusters is reduced however, the more high-density clusters have been formed in the city. Indifferent (Residual) zones have emerged during these periods in places where the High-High zones have formed, this means that New boundaries will change to form high-high clusters. Manuscript profile

Open Access Article

2 - Spatial Variability of Light Non-Aqueous Phase Liquid (LNAPL) in the Industrial Shahr-e-Rey Aquifer (South Tehran)

In the study area, Shahr-e-Ray industrial zone, south of Tehran, petroleum activities have led to aquifer pollution, so that in some parts the thickness of a light non-aqueous phase liquid (LNAPL) on the surface of the groundwater reaches to more than 20 meters. In t More

In the study area, Shahr-e-Ray industrial zone, south of Tehran, petroleum activities have led to aquifer pollution, so that in some parts the thickness of a light non-aqueous phase liquid (LNAPL) on the surface of the groundwater reaches to more than 20 meters. In this regard, estimation of thickness, density and viscosity of LNAPL, is of great importance to understand the quality of petroleum products of aquifer. Regarding the results of measurement, the range of LNAPL thickness in the aquifer vary between 2.73 to 14.305 m and the range of relative density (LNAPL to water) vary 0.78 to 0.83 and the range of viscosity vary 0.60 to 1.91 cst. According to the result in 10 wells the highest thickness of LNAPL is in the eastern and northeastern regions of the study area. Manuscript profile

Open Access Article

3 - Spatial Variability of Light Non-Aqueous Phase Liquid (LNAPL) in the Industrial Shahr-e-Rey Aquifer‌ (South Tehran)

In the study area, Shahr-e-Ray industrial zone, south of Tehran, petroleum activities have led to aquifer pollution, so that in some parts the thickness of a light non-aqueous phase liquid (LNAPL) on the surface of the groundwater reaches to more than 20 meters. In this More

In the study area, Shahr-e-Ray industrial zone, south of Tehran, petroleum activities have led to aquifer pollution, so that in some parts the thickness of a light non-aqueous phase liquid (LNAPL) on the surface of the groundwater reaches to more than 20 meters. In this regard, estimation of thickness, density and viscosity of LNAPL, is of great importance to understand the quality of petroleum products of aquifer. Regarding the results of measurement, the range of LNAPL thickness in the aquifer vary between 2.73 to 14.305 m and the range of relative density (LNAPL to water) vary 0.78 to 0.83 and the range of viscosity vary 0.60 to 1.91 cst. According to the result in 10 wells the highest thickness of LNAPL is in the eastern and northeastern regions of the study area. Manuscript profile

Open Access Article

4 - Cultural Sustainability, Density and Housing Typology; Case study : Residential Areas of Tabriz Metropolis
Islam Karami Mojtaba Rafieian Ali Javan Frozandeh Roshanak Sakhinia

By drawing on the tool of studying physical density and residential typology with reference to cultural dimensions, this study aims to examine the concept of culture, with particular emphasis on traditional and Islamic values (with qualitative nature), within both theor More

By drawing on the tool of studying physical density and residential typology with reference to cultural dimensions, this study aims to examine the concept of culture, with particular emphasis on traditional and Islamic values (with qualitative nature), within both theoretical and practical domains and bring it together with the complex and practical concept of physical density(with quantitative nature). In doing so, this study attempts to find strategies to guarantee the perpetual presence of culture in contemporary cities and particularly in residential setups (with qualitative/quantitative nature). The Spacemate is a tool based on the relation between density and structural forms in any scale under study which can assist architects, planners, and urban designers in their decision-making and design projects, where four quantitative indices of density can get involved simultaneously. In this study, not only this tool would be examined in relation to sustainability but also it will be used as a method in defining the relation between the types and sustainability itself. After a brief review on the related literature in three fields of typology, density and cultural sustainability, the study attempts to clarify the relationship between these three fields and the definition of qualitative indices, cultural sustainability and quantitative indices of physical density which relate to different types of residences. A typological approach to the issue of housing with regards to cultural debates can be instrumental because while proposing solutions and programming it can indicate which specific types are to be supported and which types to be prevented or restricted. In order to extract the dimensions and indices of cultural sustainability, qualitative concepts of residential sustainability in the domain of culture was surveyed and by utilizing the Delphi method, during two stages, the questionnaires completed by tens of experts in the field were assessed and selected. From among these concepts, six were detected as the most important concepts and were used during the analysis. Eleven samples from various points of residential spaces in the city of Tabriz were selected for the analysis as representatives of the different types while considering the geographical and cultural distribution of the city. After calculation and statistical analysis of the data, the degree of cultural sustainability of each sample was transferred to Spacemate and was interpreted. Manuscript profile

Open Access Article

5 - Investigation of birds' density and species diversity of Amir-Kelayeh international wetland during a 10-year period (2007-2016), based on winter census
Hadi Pourmosa shaykhAlikelayeh Saeid Naderi

10.29252/.5.8.15

Amir-Kelayeh international wetland is as one of the important wintering habitats for birds. In present study, the density and diversity of bird species (waterbird, wader and terrestrial bird dependent to the wetland) has been studied in Amir-Kelayeh international wetlan More

Amir-Kelayeh international wetland is as one of the important wintering habitats for birds. In present study, the density and diversity of bird species (waterbird, wader and terrestrial bird dependent to the wetland) has been studied in Amir-Kelayeh international wetland based on the semi-winter birds census data, over a 10-year statistical period. During this ten-year period, the total number of 334776 birds from 46 different birds species was recorded in this wetland. Among the studied years, the highest number of 72188 birds in 2008 and the lowest number of 1877 birds in 2015 have been counted. In terms of quality and food items, this wetland and it's around paddy fields is a good refuge for the Anatidae and Rallidae family that with 64.86 and 50.06 percent of frequency depending on their diet, have the most abundant among the identified family. The biodiversity indexes showed a relatively high amounts, but with a declining trend, and also the index of species evenness indicated a stable trend during this 10-year period in Amir-Kelayeh Wetland. Considering the decreasing trend of biodiversity indexes in Amir-Kelayeh wetland in recent years, increasing the wetland ecological conservation through the management plans such as habitat structure conservation, and illegal hunting and pollution control is recommended. Manuscript profile

Open Access Article

6 - Low Distance Airplanes Detection and Tracking Visually using Spectral Residual and KLT Composition
Mohammad Anvaripour Sima Soltanpour

10.7508/jist.2014.03.004

This paper presents the method for detection and tracking airplanes which can be observed visually in low distances from sensors. They are used widely for some reasons such as military or unmanned aerial vehicle (UAV) because of their ability to hide from radar signals; More

This paper presents the method for detection and tracking airplanes which can be observed visually in low distances from sensors. They are used widely for some reasons such as military or unmanned aerial vehicle (UAV) because of their ability to hide from radar signals; however they can be detected and viewed by human eyes. Vision based methods are low cost and robust against jamming signals. Therefore, it is mandatory to have some visual approaches to detect airplanes. By this way, we propose spectral density for airplane detection and KLT algorithm for tracking. This approach is a hybrid of two distinct methods which have been presented by researchers and used widely in detection or tracking specific objects. To have accurate detection, image intensity would be adjusted adaptively. Correct detected airplanes would be achievable by eliminating some long optical flow trajectory in image frames. The proposed method would be analyzed and evaluated by comparison with state of the art approaches. The experimental results show the power of our approach in detection of multiple airplanes unless they become too small in presence of other objects and multiple airplanes. We make some test by implementing our approach on an useful database presented by some researchers. Manuscript profile

Open Access Article

7 - A New Node Density Based k-edge Connected Topology Control Method: A Desirable QoS Tolerance Approach
Mohsen Heydarian

10.7508/jist.2016.04.006

This research is an ongoing work for achieving consistency between topology control and QoS guarantee in MANET. Desirable topology and Quality of Service (QoS) control are two important challenges in wireless communication networks such as MANETs.In a Mobile Ad hoc Netw More

This research is an ongoing work for achieving consistency between topology control and QoS guarantee in MANET. Desirable topology and Quality of Service (QoS) control are two important challenges in wireless communication networks such as MANETs.In a Mobile Ad hoc Network, MANET, nodes move in the network area; therefore, the network topology is randomly and unpredictably changed. If the network topology is not controlled properly, the energy consumption is increased and also network topology probably becomes disconnected. To prevent from this situation, it is necessary to use desirable dynamic topology control algorithms such as k-edge connectivity methods. This papertries to improvethe three following parameters according to the k-edge connectivity concepts: (1) network performance, (2) reduce energy consumption, and (3) maintain the network connectivity. To achieve these goals, as a new method, we enhance k-edge connectivity methods using an improved definition of node density. The new method is called as: Node Density Based k-edge connected Topology Control (NDBkTC) algorithm. For the first time the node density definition is dynamically used. The new method, computes the node density based on a new equation which consists of the following factors: the relative velocity of nodes, distance between nodes, the number of nodes and the transmission range of nodes. The results show that our new method improves the network performance compared with the existing methods. Also we will show that the new method can holds QoS in a desirable tolerance range. Manuscript profile

Open Access Article

8 - Density Measure in Context Clustering for Distributional Semantics of Word Sense Induction
Masood Ghayoomi

10.7508/jist.2020.01.002

Word Sense Induction (WSI) aims at inducing word senses from data without using a prior knowledge. Utilizing no labeled data motivated researchers to use clustering techniques for this task. There exist two types of clustering algorithm: parametric or non-parametric. Al More

Word Sense Induction (WSI) aims at inducing word senses from data without using a prior knowledge. Utilizing no labeled data motivated researchers to use clustering techniques for this task. There exist two types of clustering algorithm: parametric or non-parametric. Although non-parametric clustering algorithms are more suitable for inducing word senses, their shortcomings make them useless. Meanwhile, parametric clustering algorithms show competitive results, but they suffer from a major problem that is requiring to set a predefined fixed number of clusters in advance. The main contribution of this paper is to show that utilizing the silhouette score normally used as an internal evaluation metric to measure the clusters’ density in a parametric clustering algorithm, such as K-means, in the WSI task captures words’ senses better than the state-of-the-art models. To this end, word embedding approach is utilized to represent words’ contextual information as vectors. To capture the context in the vectors, we propose two modes of experiments: either using the whole sentence, or limited number of surrounding words in the local context of the target word to build the vectors. The experimental results based on V-measure evaluation metric show that the two modes of our proposed model beat the state-of-the-art models by 4.48% and 5.39% improvement. Moreover, the average number of clusters and the maximum number of clusters in the outputs of our proposed models are relatively equal to the gold data Manuscript profile

Open Access Article

9 - The Study of mosque distribution in the Tehran 8 region with spatial analyses in Geographic Information System

One of the main indicators among Muslim people is the spatial distribution of mosque in relation with population density and location of mosque in the cities In this study the spatial distribution of mosques in the region 8 Tehran municipality based on spatial analysis More

One of the main indicators among Muslim people is the spatial distribution of mosque in relation with population density and location of mosque in the cities In this study the spatial distribution of mosques in the region 8 Tehran municipality based on spatial analysis techniques in the GIS environment studied After creating a mosque geodatabase in the GIS environment for the distribution of mosques in the region 8 Tehran, density analysis and distance analysis for distribution of mosques with population density. Based on spatial analyses studied. Based on this research results, 43.3 percent of region 8 Tehran had a normal condition of proportion population and mosque distribution. Although 32.2 percent of region 8 that are located in the east part of this region, doesn’t have good relation among population density and mosque distribution. The lack of land for development in this region is one of problem for increase mosque in this area Manuscript profile

Open Access Article

10 - Citizens' Behavioral Response to Social Diseases in Conflict with Natural Disasters and City Spread
hasanali faraji sabokbar behzad nadi Mohammad Rezaei Narimisa

When the damage condition occurs, accidents such as earthquakes and floods become critical crises. Today, these natural crises are among the issues that are the prevalence of urban communities and can endanger the everyday life of various economic, social and environmen More

When the damage condition occurs, accidents such as earthquakes and floods become critical crises. Today, these natural crises are among the issues that are the prevalence of urban communities and can endanger the everyday life of various economic, social and environmental dimensions. This research is also aimed at explaining social factors that provide vulnerability conditions. Based on this nature, it is descriptive-analytical in nature and in terms of the purpose of developmental-applied purpose. The community of this region is 6th municipality of Tehran, which has been selected as a sample based on the age and the centrality. The data were collected in two fields of the field and a library with tools such as the Dmitry questionnaire and network analysis, books, articles and various maps, and analyzed using EXCEL, MATLAB, IDRISI and ARC GIS 10.1 software’s. The results indicate that the highest vulnerability of the center, the south, and especially the south-east of the range, are among the problematic tissues with a high life and age, as well as the highest density of buildings, population and household size they also have to. The presence of such factors has a significant effect on the access of residential areas to fire centers, therapies and open spaces during and after natural disasters. Manuscript profile

Open Access Article

11 - A New Approximate Analytical Method for Performance Analysis of Regular LDPC Codes Iterative Decoding on AWGN Channels
H. Samimi P. Azmi Mohammad hakak

In this paper we propose a new Gaussian-based analytical method for performance analysis of regular LDPC codes iterative decoding on AWGN channel. The proposed method has good accuracy and low complexity in comparison with current methods. Based on our developed analyti More

In this paper we propose a new Gaussian-based analytical method for performance analysis of regular LDPC codes iterative decoding on AWGN channel. The proposed method has good accuracy and low complexity in comparison with current methods. Based on our developed analytical equations, we present an error propagation model for the iterative decoder of LDPC codes which can be used as a simple tool for convergence analysis of LDPC codes on the AWGN channel. Manuscript profile

Open Access Article

12 - A Likelihood Ratio Approach to Information Fusion for Image-Based Fingerprint Verification
M. S. Helfroush M. Mohammadpour

Image-based fingerprint verification systems have been considered as a parallel method against the minutiae-based approach. This paper proposes a training based fusion method for fingerprint verification, using likelihood ratio (L.R). In this method, the matching scores More

Image-based fingerprint verification systems have been considered as a parallel method against the minutiae-based approach. This paper proposes a training based fusion method for fingerprint verification, using likelihood ratio (L.R). In this method, the matching scores which are extracted from orientation, spectral and textural features are fused. In order to fuse these image-based features, the likelihood ratio approach has been employed. FVC2000 database has been selected to evaluate the method. Also, the proposed method has been compared to a similar one that uses the simple sum as its fusion system. The comparison results show that the proposed fusion method has made a significant improvement for the accuracy of matching system, so that the equal error rate (ERR) of proposed system has been reduced to 0.14%. Manuscript profile

Open Access Article

13 - Multi-Objective Optimization of Surface-Mounted PM Machines Using an Analytical Model for the Pole-Shifting Method
V. Zamani Faradonbe S. Taghipour Boroujeni

In the presented work an analytical model is developed for the pole-shifting method in the surface-mounted PM machine at no-load condition. The machine cogging torque and the harmonic spectrum of the air gap flux density are most no-load indexes of the machine performan More

In the presented work an analytical model is developed for the pole-shifting method in the surface-mounted PM machine at no-load condition. The machine cogging torque and the harmonic spectrum of the air gap flux density are most no-load indexes of the machine performance. It is shown that, although, the pole-shifting reduces the machine cogging torque; it destroyed the half-odd symmetry in the PMs and produces even harmonics in the air gap flux density. The even harmonics of the air gap flux density, results in undesired torque pulsations. Using the developed analytical model and the direct search method a multi-objective optimization is carried out for the machine cogging torque and the total harmonic distortion of the air gap flux density. Since, the considered variables are not in a same unite; a normalized technique is applied. Finally, the developed model and the obtained results are verified by finite element analysis. Manuscript profile

Open Access Article

14 - Proposing a Density-Based Clustering Algorithm with Ability to Discover Multi-Density Clusters in Spatial Databases
A. Zadedehbalaei A. Bagheri H. Afshar

Clustering is one of the important techniques for knowledge discovery in spatial databases. density-based clustering algorithms are one of the main clustering methods in data mining. DBSCAN which is the base of density-based clustering algorithms, besides its benefits s More

Clustering is one of the important techniques for knowledge discovery in spatial databases. density-based clustering algorithms are one of the main clustering methods in data mining. DBSCAN which is the base of density-based clustering algorithms, besides its benefits suffers from some issues such as difficulty in determining appropriate values for input parameters and inability to detect clusters with different densities. In this paper, we introduce a new clustering algorithm which unlike DBSCAN algorithm, can detect clusters with different densities. This algorithm also detects nested clusters and clusters sticking together. The idea of the proposed algorithm is as follows. First, we detect the different densities of the dataset by using a technique and Eps parameter is computed for each density. Then DBSCAN algorithm is adapted with the computed parameters to apply on the dataset. The experimental results which are obtained by running the suggested algorithm on standard and synthetic datasets by using well-known clustering assessment criteria are compared to the results of DBSCAN algorithm and some of its variants including VDBSCAN, VMDBSCAN, LDBSCAN, DVBSCAN and MDDBSCAN. All these algorithms have been introduced to solve the problem of multi-density data sets. The results show that the suggested algorithm has higher accuracy and lower error rate in comparison to the other algorithms. Manuscript profile

Open Access Article

15 - Optimum Design of Out-runner PM BLDC Motor with High Torque Density for Flywheel Applications as Energy Storages: Design, FEA and Fabrication
O. Safdarzadeh H. Torkaman Mohammad Mahdavy Fakhr

Optimum design of electrical motors may be considered as a complex optimization problem due to the wide variety of mechanical, electrical, electromagnetics parameters, although recently it can be accomplished utilizing heuristic optimization algorithms. In this paper op More

Optimum design of electrical motors may be considered as a complex optimization problem due to the wide variety of mechanical, electrical, electromagnetics parameters, although recently it can be accomplished utilizing heuristic optimization algorithms. In this paper optimum design of an out-runner PM BLDC motor for flywheel energy storage applications is performed. The optimization utilized particle swarm optimization (PSO) algorithm to achieve maximum torque density. Accordingly, the motor design equations are employed in the fitness function of the algorithm. Based on the random initial values and respecting the designs constraints, the optimum design is achieved. Effectiveness of the algorithm results are verified by finite element analysis (FEA) and motor operating parameters are obtained and analyzed. Finally, the prototype of the motor is fabricated and experimental results are demonstrated to show the applicability of the model and analysis. Manuscript profile

Open Access Article

16 - Review on the Polysulfone Based Membranes for Separation of Low-Density Lipoprotein from Blood
Rahim Dehghan Jalal Barzin Behnam Darabi Hamidreza Ghaderi

Cardiovascular diseases are the most common cause of fatality all over the world. A severe increase of low-density lipoprotein (LDL) concentration in blood is recognized as the main cause of coronary artery disease (CAD) and atherosclerosis. LDL apheresis from blood is More

Cardiovascular diseases are the most common cause of fatality all over the world. A severe increase of low-density lipoprotein (LDL) concentration in blood is recognized as the main cause of coronary artery disease (CAD) and atherosclerosis. LDL apheresis from blood is one of the extracorporeal options for patients suffering from this disorder which drug therapy is not effective for them. LDL apheresis is classified in cascade filtration and adsorption-based methods. In this study further reviewing all LDL apheresis techniques, polysulfone (PSU) membranes for selective adsorption of LDL were investigated. By inspiring from inherent LDL receptor (LDLR) of body, different methods including heparinization of PSU membrane by various methods such as chloromethylation, treatment with ammonia plasma and co-deposition of polydopamine and polyethyleneimine can be used for adsorption of LDL from the blood. Also, membrane ionic glycosylation by click chemistry and grafting of alginate sulfate on the surface of PSU membrane to adsorption of LDL were reviewed. To investigate surface modification accuracy, different analyses such as X-ray photo spectroscopy (XPS), Attenuated total reflectance Fourier transform infrared (ATR-FTIR), -Potential and water contact angle are used. Blood compatibility is another factor for the development of these membranes for defined application. Manuscript profile

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