Mohammad Reza Malek

K.N.Toosi University of Technology | KNTU · Faculty of Geodesy and Geomatics Engineering

The spread of Covid-19 has become one of the most important challenges in the world. This disease spread rapidly around the world and affected all countries. Most countries tried to deal with it with non-pharmacological interventions, including the imposition of coronavirus restrictions. Predicting this disease is one of the basic ways to deal with...

Background Bluetooth low energy (BLE)-based contact-tracing applications were widely used during the COVID-19 pandemic. However, the use of only the received signal strength feature for proximity calculations may not be adaptable to different virus variants or scalable for other potential epidemic diseases. Objective This study presents a novel fr...

بشر همواره با تهدیدهایی در قالب همه‌گیری روبه‌رو بوده كه جديدترين آن‌، همه‌گیری ويروس كرونا می‌باشد یکی از روش های موثر در کنترل این بیماری اعمال قرنطینه و تعطیلی مشاغل می¬باشد. اعمال قرنطینه کلی، منجر به ضررهای اقتصادی و اجتماعی برای شهروندان می¬شود. به همین دلیل منطقی است که از قرنطینه¬های هوشمند و محلی به عنوان جایگزینی برای قرنطینه کلی استفاده...

A simplex-based enriched graph data model combining a discrete and place-based indoor spatial model with a location-based social network (LBSN) is presented in this research. The proposed model integrates similarity and relevance indicators from Q-analysis of simplicial complexes, allowing for easier data manipulation and discovering latent relatio...

In this paper, we developed a score-based credibility assessment model which assesses the credibility of text and map-based VGI. We proposed parameters for assessing the credibility of VGI such as distance, hazard, and clustering. Then, the model was created based on the above-mentioned parameters, and the credibility scores of reports were compute...

Ships vulnerability analysis is one of the most important issues in today’s research, to reduce damage and increase safety. To increase the safety of ships, the effective parameters of the vulnerability of ships, the impact of each of them, and the relationship between these parameters should be identified to formulate different scenarios to analyz...

Earthquakes lead to enormous harm to life and assets. The ability to quickly assess damage across a vast area is crucial for effective disaster response. In recent years, social networks have demonstrated a lot of capability for improving situational awareness and identifying impacted areas. In this regard, this study proposed an approach that appl...

One of the constraints in Wireless Sensor Network (WSN) is the limited power of distributed interconnected sensor nodes over the space. There are several proposed architectures for handling power consumption in a WSN. Traditional clustering and routing methods improve the Cluster Head (CH) selection of WSN internodes for balancing energy in the net...

Due to the increasing relevance of spatial information in different aspects of location-based services, various methods are used to collect this information. The use of crowdsourcing due to plurality and distribution is a remarkable strategy for collecting information, especially spatial information. Crowdsourcing can have a substantial effect on i...

Today, volunteered geographic information (VGI) has provided an innovative, fast, and low-cost approach to data collection. Using this approach will lead to problems such as semantic heterogeneity. Ontology is one of the newest modeling scientific methods and that can solve the data semantic heterogeneity problems. But using ontology to collect inf...

Today, volunteered geographic information (VGI) has provided an innovative, fast, and low-cost approach to data collection. Using this approach will lead to problems such as semantic heterogeneity. Ontology is one of the newest modeling scientific methods and that can solve the data semantic heterogeneity problems. But using ontology to collect inf...

Natural disasters have always been one of the threats to human societies. As a result of such crises, many people will be affected, injured, and many financial losses will incur. Large earthquakes often occur suddenly; consequently, crisis management is difficult. Quick identification of affected areas after critical events can help relief workers...

This paper introduces a simplex-based enriched graph data model integrating a discrete and place-based indoor spatial model with a spatial-social network. The proposed model incorporates similarity and relevance measures, exhibited from Q-analysis of simplicial complexes, facilitating data manipulation and revealing latent relations in a spatial-so...

One of the most important challenges of volunteered geographic information (VGI) is the quality assessment. Existing methods of VGI quality assessment, either assess the quality by comparing a reference map with the VGI map or deriving the quality from the metadata. The first approach does not work for a real-time scenario and the latter delivers a...

Trajectory similarity measurement is a vital and widely used step in many applications, including recommendation systems. In the discipline of similarity measurement, research has mostly been focused on raw trajectories, consisting of location and time‐stamp information. Due to the explosion in the use of the internet and location‐based social netw...

این فایل چند صفحه نخست از استاندارد ملی ایران در حوزه خدمات مکان مبنا با عنوان مدل مرجع است. شماره استاندارد 11336 می باشد نسخه . کامل آن از سایت سازمان ستاندارد قابل دریافت است

زمین¬لرزه یکی از پر تکرارترین سوانح طبیعی در دنیا بوده که سالیا¬نه منجر به خسارات مالی و جانی فرااوانی می¬شود. یکی از مهم¬ترین موارد مرتبط با کاهش بحران ناشی از زمین¬لرزه چه در مرحله برنامه¬ریزی و چه بعد از رخداد آن در مرحله امداد، یافت مکان¬های مناسب برای اسکان موقت مردم می¬باشد. مکان¬یابی بویژه در شرایط بحران همواره با عناصر عدم قطعیت و نایقینی ه...

این فایل چند صفحه نخست از استاندارد ملی ایران در حوزه خدمات مکان مبنا با عنوان مدل مرجع است. شماره استاندارد 11313 می باشد نسخه . کامل آن از سایت سازمان ستاندارد قابل دریافت است

Providing recommendations in cold start situations is one of the most challenging problems for collaborative filtering based recommender systems (RSs). Although user social context information has largely contributed to the cold start problem, most of the RSs still suffer from the lack of initial social links for newcomers. For this study, we are g...

Emerging the power of collective intelligence through crowdsourcing could create a clear path for visualizing real estate as well. One of the Crowdsourcing applications is describing the indoor space of a real estate. This paper aims to describe real estate in the context of spatial crowdsourcing. Qualitative and quantitative criteria were used in...

The increase in world population and the value of time in the current period are changing the importance of air transportation. Due to increase popularity, airport officials have increased the number of flights. Because of the fact that the airports capacity is constant, airport traffic has increased. Regarding this, airport managers are looking fo...

آموزش الکترونیکی گستره وسیعی از سامانه¬های رایانه مبنا را برای یاددهی و آموزش شامل می¬شود. در مجموع همه این موارد دربردارنده سه مولفه آموزش، رایانه و شبکه مخابرات است. بسیار ساده می توان دید که اینگونه محیطها در عمل خود نوعی از ساختار اجتماعی مجازی را شکل می¬دهند. در آن مولفه¬های ساختار، علقه یا وجه ارتباط ، سیستم ارتباطی و سایر مولفه های شبکه های...

Nowadays, due to the widespread use of social networks, they can be used as a convenient, low-cost, and affordable tool for disseminating all kinds of information and data among the massive users of these networks. Issues such as marketing for new products, informing the public in critical situations, and disseminating medical and technological inn...

Natural disasters have always been difficult to manage because of their spatio-temporal scale. Although the use of GIS and RS has made this process somewhat simpler, there are still serious challenges in managing and smart allocating human resources, increasing operational power and cost savings, continuous monitoring, and ensuring the effectivenes...

A landscape generally consists of both natural and human-made elements of a land area. Human representations of landscapes can cover a wide range of expressions, from figurative paintings to photography and natural language expressions. However, the way humans perceive, describe, and value a given landscape is still a difficult task to address. The...

Introduction and Objective: Driving accidents impose numerous social, economic, and cultural costs to various societies, among which developing countries are the most affected. The identification of incident points of accidents is one of the proposed methods to deal with the dangers of accidents. Among the various events associated with transportat...

در اين مقاله مروري بر روشهاي موقعیتيابي مبتني بر مدل مکاني در محیطهاي داخلي ارائه شده است. در اين روشها از مدل مکاني تولیدشده از نقشهي محیط به عنوان يک ابزار همیار براي موقعیتيابي و ناوبري استفاده ميشود. در مجموع دو مدل مکاني سلولي و گرافمبنا براي مدلسازي در فضاهاي بسته موجود است. محققان با در نظر گرفتن خصوصیات مدل، مسئلهي مورد مطالعه و فناوري موقع...

The rapid development of IoT sensors and data provided by Social Networks has necessitated the fast development of recommender systems as they can be used as a tool to filter items that are more likely to be preferred by users. A major goal of recommender systems is to provide users with personalized recommendations after analyzing their preference...

رﺷﺪ روزاﻓﺰون دﺳﺘﮕﺎه¬ﻫﺎي ﻣﺠﻬﺰ ﺑﻪ فناوری¬های ﺗﻌﻴﻴﻦ ﻣﻮﻗﻌﻴﺖ ﺑﻪ ﻛﺎرﺑﺮان ﺷﺒﻜﻪﻫﺎي اﺟﺘﻤﺎﻋﻲ، اﻣﻜﺎن ﻣﻲدﻫﺪ ﺗﺎ ﺑﻪ ﻃﻮر ﻣﺴﺘﻤﺮ اﻃﻼﻋﺎت ﻣﻜﺎﻧﻲ ﻣﺮﺗﺒﻂ ﺑﺎ ﻣﻮﻗﻌﻴﺖ ﻓﻌﻠﻲ ﺧﻮدﺷﺎن را ﺑﻪ اﺷﺘﺮاك ﺑﮕﺬارﻧﺪ و از اﻳﻦ ﻃﺮﻳﻖ اﻳﻦ ﺷﺒﻜﻪﻫﺎ داراي ﺷﺎﺧﺼﻪﻫﺎي ﻣﻜﺎﻧﻲ ﮔﺮدﻳﺪه و بعنوان داده¬های مکان¬مبنا بکار می¬روند. یکی از مباحث به¬¬روز در زمینه شبکه¬های اجتماعی مکان¬مبنا، مانایابی و یا تعیین شبا...

Propagating crowdsourcing services via a wireless network can be an appropriate solution to using the potential of crowds in crisis management processes. The present study aimed to deploy crowdsourcing services properly to spatial urgent requests. Composing such atomic services can conquer sophisticated crisis management. In addition, the conducted...

Nowadays, one of the most important factor for better land management are the land administration systems. Therefore, it is necessary accurate and up-to-date data on these systems. Common data collection methods, such as photogrammetry and remote sensing, are usually cost-effective and somewhat time-consuming. So, it is necessary to find new method...

Nowadays, one of the most important factor for better land management are the land administration systems. Therefore, it is necessary accurate and up-to-date data on these systems. Common data collection methods, such as photogrammetry and remote sensing, are usually cost-effective and somewhat time-consuming. So, it is necessary to find new method...

Identifying influential nodes in social networks is a key issue in many domains such as sociology, economy, biology, and marketing. A common objective when studying such networks is to find the minimum number of nodes with the highest influence. One might for example, maximize information diffusion in social networks by selecting some appropriate n...

Introduction Initially, researches were conducted on the positioning inside and outside of the building separately, and separate methods have been presented to determine the position inside and outside the building. But today, they are seeking methodswithout borderfor the positioning that can be used to conduct both indoor and outdoor location. Tod...

Intelligent air-based threats are considered as the main elements of terrorist attacks which damage vital infrastructures. Air defence systems with a strategic and decisive role in defense networks require smart management and operational mechanisms to countermeasure the threats and risks both quickly and decisively. The main objective of this inve...

Almost all crises or disasters have vast consequences in both spatial and temporal scale which are difficult to manage because of the size of hazards and their complexities. To conquer the vast size of consequences, it is possible to deploy potential of crowds but there are few developed tools to come over the complexity of required emergency proce...

Nowadays, mobile phones have been increasingly advertised. These performance advertisement tools altered to be one of the beneficial factor in order to promote products and services in national or local companies. One of the outstanding features of mobile phones is that everybody has its accessibility in different circumstances and times. Companies...

Introduction: Over time, spatial data has evolved from paper maps to Web GIS through digital mapping and finally to the current generation of GIS. Although this new interface has enhanced user’s insights about spatial information, it still needs more tangible interface that can be usable to the public and enhance human interaction with the environm...

Improving the safety of the service needs total integrated management of the airport, which due to In-dependency of management in various sectors of activity is relatively difficult. Yet, continuance of this process, can affect all operations of an airport alone. Increasing flights in the airports lead to traffic jam of service cars results in an i...

Designing and Implementation a Context-Aware Augmented Reality System Introduction: Over time, spatial data has evolved from paper maps to Web GIS through digital mapping and finally to the current generation of GIS. Although this new interface has enhanced user’s insights about spatial information, it still needs more tangible interface that can b...

اطلاعات مکاني داوطلبانه گونهاي از اطلاعات مکاني است که به صورت اختیاري، توسط افراد عادي، بدون نیاز به آموزش علمي و با توجه به دانش محلي تهیه ميشود. اطلاعات مکاني داوطلبانه در مقايسه با دادههاي مکاني استاندارد، داراي مزاياي فراواني از جمله دسترسي آسان به اطلاعات و قابلیت بهروزرساني سريع است، ولي کیفیت اين دادهها يکي از موانع استفاده گسترده از اين دا...

A pervasive computing environment is characterized by computing capabilities and effective use of smart spaces.Many critical elements of pervasive computing, such as wireless networks are now viably commercial products. Ambient services are known as one of the main types of pervasive information services in which suitable information is presented t...

Point-of-interest is a feature in a specific location which is somehow important for user. For clear reasons, these features are kinds of point feature in a spatial database. Similarly, line-of-interest is a linear feature that is attractive to the users. The surface feature such as an entertainment area or a specific land use, can be defined as an...

واقعیت افزوده ترکیبي از ديد واقعي با محتواي مجازي در زمان آني است که رابطي جهت بهبود درک کاربر با دنیاي واقعي و تعامل با آن است. استفاده گسترده از دستگاههاي تلفن هوشمند مجهز به حسگرهاي مختلف مانند GPS ، ژيروسکوپ، دوربین و همچنین دسترسي گوناگون به شبکههاي بيسیم با سرعتبالا، سرويسهاي واقعیت افزوده را در سالهاي اخیر بهطور فزايندهاي محبوب کرده است. اغل...

Improve the safety of the service needs total integrated management of the airport, which due to independency of management in various sectors of activity is relatively difficult. Yet, continuance of this process, can affect all operations of an airport alone. Increasing flights in the airports lead to traffic jam of service cars results in an incr...

AI (Avian Influenza) is one of the most important respiratory, and contagious pathogens in poultry that has fast release power. At present, around 33 pandemics of H5 and H7 over-the-counter influenza have emerged from the 1950s to 2017. The largest pandemic is H5N1 pandemic in 63 countries, and now it turnes to H5N8. Like the H5N8 pandemic in the y...

Large amount of users’ trajectories, is an emerging source of inexpensive data that can be used to provide an opportunity to present route recommendation service to the unfamiliar users within the area. In this study, with the aim of finding the optimal route, we first extract both local users and local road segments data sets by ranking them via H...

Flood is one of the most devastating natural disasters with socio-economic and environmental Consequences. Thus, comprehensive flood management is essential to reduce the flood effects on human lives and livelihoods. The main goal of current study is to investigate the application ensemble of evidential belief function with AHP (EBF-AHP), for flood...

As the GIS increases its influence in practical solutions especially for urban management, interests in complex features among software companies increase too. Nevertheless ontological developments has not been started to consider urban object relations especially for topological ones. Although topological relations have numerous applications in di...

با وجود گستردگی استفاده از سیستم تعیین موقعیت جهانی ،GPSاین سیستم برای محیطهای بسته و مسقف قابل استفاده نیست. روشهای مختلفی برای توسعهی سیستم تعیین موقعیت محیطهای مسقف ارائه شده که عموما بر اساس دریافت امواج رادیویی ارسالی از فرستندههایی با موقعیت مشخص هستند. زمان دریافت سیگنال، اختلاف زمان دریافت سیگنال، زاویه دریافت و اثرانگشت مکانی از جمله این ر...

Describing a landscape means making link between concepts of visible features and people’s perception. Most landscape description methods underline salient entities which are a key trigger for wayfinding problems and tourism management. Searching for a better understanding of landscape descriptions implies to explore and identify the main visual pr...

Nowadays, due to widespread use of maps and geospatial information systems in different organizations, different data layers collection methods for the preparation of required spatial data information, is of great importance. On the other hand doing in parallel in the preparation of spatial data and its storage in disparate sources often cause heav...

Ad hoc shared ride trip planning (SRTP) utilizes mobile devices, geo-sensors and wireless networks to match on-the-fly individual travel demand with transport supply. It represents one of many alternatives to single occupancy vehicle use. This paper outlines a SRTP approach via a two-phase algorithm based on user preferences in a time-dependent rou...

The rapid growth of location-based social networks throght attracting millions users, reveal the high popularity in the shor time period. A result of the location based social network services, access to a large collection of data that can extract the spatial history, social relationships structure, movement behavior and characteristics of users.Th...

Information sharing through semantic Web services is the new essential paradigm in the 21st century. The standard web provides a suitable platform to put different data in a simple and understandable manner. Although the standard web is successful in gathering, retrieval and accessing to this information is difficult. One of the main sources of suc...

Landscape refers to the visible features of an area of land often considered in terms of their aesthetic appeal. The spatial configurations, composition conditions and perception situations of a landscape may be described by people, which reveal how they see and percept the landscape; thus they are different from person to person depending on the w...

Information sharing through semantic Web services is the new essential paradigm in the 21st century. The standard web provides a suitable platform to put different data in a simple and understandable manner. Although the standard web is successful in gathering, retrieval and accessing to this information is difficult. One of the main sources of suc...

Today's internet and wireless networks have been improved and it has been possible to use various sensors like GPS and Accelerometer in mobile devices. Also considering other improvements of mobile devices, these devices have being changed from toys into tools. Mobile navigation services are those of the applications that help users in navigation p...

استفا ده از سیستم های اطلاعات همراه براي ارائه انواع خ دمات اطلاعاتي به ویژه د ر حوزه اطلاعات مکاني روز به روز در حال گسترش است. يکي از خ دمات بسيار پرکاربر د در این زمینه، خ دمات مرتبط با ناوبري و راهی‌ابی است. توسعه قابلی تها و امکانات د ر اين حوزه همواره با مح دو ديت فضاي حافظه، پرد ازش و صفحه نمایش روبرو بود ه است. د ر این راستا، مقاله حاضر، به...

Using 3D spatial data causes efficiency in urban planning and faster decision making. Within the last years, such terms like Volunteered Geographic Information (VGI) and User Generated Geographic Content (UGGC) appeared, and produce a completely new phenomenon in public collecting spatial data and define a new source of data. Adding 3D data to VGI...

In recent years development of electronics and computations conduced to significant progresses to create smart environments and systems. Ambient intelligence is one of the most paradigms of electronic and telecommunication environments. Ambient intelligence refers to an environment in which the people are surrounded by intelligent and intuitive int...

A Location-Aware Map Visualization Based on Fisheye Projection System Key words: Map visualization, Context awareness, Fisheye projection, Location aware system, Navigation Abstract In a navigation system, map visualization based on vehicle’s location and environment plays an important role. Therefore, it is necessary to visualize useful informati...

The infrastructure of most of the practical and construction activity in communities is based on correct understanding and proper use of spatial data in GIS1 and SDI2. Optimal and efficient use of infrastructure systems of the spatial data by users, depends on how to search and access of user to proper and desired data among informative sources of...

در چند سال اخير شبکه هاي اجتماعي مکان مبنا در قالب رسانه هاي اجتماعي, محبوبيت زيادي کسب کرده اند. آنها خدماتي ارائه مي دهند که مرتبط با مکان بوده و به کاربران اجازه مي دهد تا در نقاط جغرافيايي مختلف اقدام به ورود نمايند و از اين طريق تجربيات و موقعيت هاي بازديد شده را با دوستان خود به اشتراک بگذارند. در واقع اين شبکه ها به عنوان پل ارتباطي بين جهان...

در سال‌های اخیر، با توسعه ی سیستم‌های کامپیوتری و علوم الکترونیک، شاهد پیشرفت‌های چشمگیری در ایجاد محیط‌های الکترونیکی و هوشمند هستیم. یکی از این محیط‌های الکترونیکی که از مهم‌ترین چشم اندازهای علوم الکترونیک و مخابرات محسوب شده، هوش محدوده‌ای است. هوش محدوده ای(Ambient Intelligence) محدوده ای است که در آن، افراد توسط محیطی متشکل از ابزارهای هوشمند...

راهيابي يکي از مهمترين فعاليت هاي روزمره افراد در کي محيط شهري است. سيستم هاي اطلاعات مکاني هدايت کاربر از متداو لترين خدماتي هستند که افراد را در پيمودن مسيرهاي مختلف با اهداف گوناگون راهنمايي م يکنند. چالش اصلي اينگونه سيستم ها ارائه اطلاعات راهيابي بصورت بافت آگاه است. مکان، زمان و شناسه فرد از جمله بافت هاي اوليه به شمار رفته و ساير بافت هاي مر...