Search

Remote Radio Unit (RRU) is the main part of the 5G base station that has a great size with a high density of chipsets and be operated with significantly high temperature. This paper introduces an optimization protocol of geometric parameters of heat sink on thermal dissipation for RRU 5G 8T8R operation at 2600MHZ. Firstly, the heat sink is calculated by analytical method with minimization of entropy energy. In the next step, two more prototypes of heat sink are proposed to consider their performance on thermal dissipation. The simulation results demonstrated that in general, the heat sink with V-shaped fin has the better performance on thermal dissipation in comparison to conventional models such as in-line arrangement fin heat sinks. An optimal heatsink for RRU 5G have been simulated by FEM method considering different working conditions such as wind speed and high attitudes. [ABSTRACT FROM AUTHOR]

Distributed energy systems are a key success factor for the future and self-determined living in undeveloped or emerging regions. Education, culture and economic growth are significantly influenced by energy processes. In order to be able to use a built-up infrastructure, maintenance and condition control of the systems along their entire life cycle are indispensable. However, this can only be achieved if an independent technical condition management system can be established. Event-based data and warnings can be transmitted or retrieved at any time. Due to this, decisions can be made on the basis of the information obtained, which then lead to the maintenance of the targeted functional scope of the power systems. In the following paper, a TCM for pv-based distributed energy systems is presented. It consists of a low performance single board computer which can be connected to a cloud system with mobile communication and transmits essential data. [ABSTRACT FROM AUTHOR]

Education has widely broad effect in every part of human-life. It generally separated to two main parts; formal and informal education. The formal education, school training, provides a fundamental knowledge for people. Because of the inadequacy in formal education and constraints in daily-life, people try to find out new training ways. Many platforms give chance to people in order to improve own self. Thanks to development in information technology, mobile devices become one of those ways. In the early year of improvement of mobile devices, they could be used for just talking and text messaging. Nowadays they have much more qualifications, such as sharing, storing information, taking photos, connecting to internet and etc. because of those qualifications; there is a new concept, called "smartphones". Because of their increasing performance, portability, and facilitating in developing applications, mobile devices have huge effect in human-life. The increasing development of software, in mobile devices, directed the companies to build mobile application marketing. Thus the mobile application marketing becomes an important product of the development in mobile technology. The mobile device users can swiftly and safely upload the applications by using mobile application marketing. Those Markets provide to easily access to their users by categorizing their applications. Nowadays indisputable leaders of smartphone marketing are Android and IOS (iPhone). Likewise the highest qualified mobile devices have mostly Android or IOS operating system. Those operating systems try to give better service by developing their software. Besides they also provide "software development environments for mobile devices" to the users. There are hundreds of resources about how to develop an application. Thus, to develop mobile applications become easier for software developer. Nowadays because of the enthusiastic mobile software developers, there are lots of applications. They can be uploaded to mobile application markets and ready for downloading. There are many categories in those mobile application markets. Education is one of those categories. The goal of this research is to create awareness in mobile education category by specifying the level of sufficiency. In this research, the best IOS and Android 50 applications, which are under the education category in online application markets, will be analyzed by specifying keywords for every application. According to intense of those keywords, it will be discussed what kind of mobile education software in online application markets, how they serve to their users and what kind of inadequacy in those applications. The results will be presented in the full paper. [ABSTRACT FROM AUTHOR]

Fifth-generation communication also known as internet of things is rolling out worldwide. It has provided higher network capacity and speed for mobile broadband communications; however, 5G network focuses only on terrestrial coverage. 6G and Cognitive Radio (CR) is expected to be the future solution to all heavy data traffic and globe coverage. Satellite communication is anticipated to cover rural areas, sea, spanning air, and space in what is known as Internet of Space Things (IoST). Low Earth Orbit (LEO) CubeSat orbits earth provide real time measurements with low transmission power and high data rate. Cognitive radio will focus on providing efficient spectrum use and resources allocations. In this paper, a multi CubeSat cognitive radio network is proposed to improve time delay, increase data exchange, and increase the Signal to Noise Ratio (SNR) of the communication system. simulation results demonstrate the convergence of the multi CubeSat system improving the signal to noise ratio for different number of CubeSats structure. [ABSTRACT FROM AUTHOR]

Observation suggests that currently almost all the aspects of human live are infused with a cyber component. In the context of fast-paced implementation of smart mobile terminals, new cyber security solutions, tools and mechanisms must be created in order to protect personal and organizations information assets. Trend analysis points out toward an increase in number and complexity of malware attacks launched against the expanding mobile communication networks and terminals. Mobile devices are vulnerable to cyber-attacks, mostly in relation with their insecure access to different digital resources, and consequently taxonomies for cyber attacks would improve the analysis and assessment of malware impact over the functionality of mobile terminals and networks. Malevolent actors can disseminate mobile malware through various techniques and subsequently the infected devices can be used as a launch pad for further cyber attacks. Since the smart mobile terminal store a great amount of private data the malware attacks against this type of device are inherently complex. In order to distinguish between the behaviour of legitimate and malevolent, there are sustained efforts within the cyber security community to analyse the modus-operandi of relevant malware. In this general operational context, the "Integrated Software Platform for Malware Analysis on Mobile Terminals" project, funded by UEFISCDI / Romanian Ministry of National Education, provides an innovative solution for an emergent cyber threat vector. This paper summarizes some of the project team's findings. [ABSTRACT FROM AUTHOR]

This paper proposes an analysis of the impact generated by usage of cross-platform frameworks for mobile applications on the performance of communications technologies for short distance between mobile devices. The analysis is based on comparative practical tests performed on the Android operating system by using an application made both native and cross platform. Developing mobile applications generally involves the use of different programming techniques and specific tools, which increases the number of possible human errors, resulting in higher development and maintenance costs. To solve these problems, different solutions have been created for the development of applications capable of running in different software ecosystems using the same code. These solutions are called cross platform frameworks. The main solutions that are used in present are achieved through cross-platform compilation techniques, web and mobile-web techniques. Each solution provides to the developer specific tools and mechanisms in order to create for the user the impression of uniqueness and the UX with which he is already accustomed. Depending on the chosen technical solution, we will have a greater or lesser impact on the overall performance of the application which, of course, also affect performance of the interaction between the device of interacting between devices using short distance communication techniques for mobile devices. In order to determine the impact generated by use of cross platform development frameworks on performance, a test application has been deployed to transmit and receive data over the various communication techniques. The application was developed using both cross-platform and native technologies. The analyzed frameworks are: Xamarin as the main representative of the cross-platform compilation solution and PhoneGap as a representative of the mobile web category. Following comparative tests, could be observed that the best performance was achieved in the cross-platform compilation process, with a 10.6% decrease of performance compared to native cases, while web-based techniques create a depreciation of 34.4%. Impairment of performance varies according to the size of the transmitted data, thus, as the size of the interchanged data increases, the performance decreases. This can be explained by the time added by multiple data call-backs between the block where the cross application running and the native operating system controllers who serve them. This article will examine how performance is affected in case of various short distance communication techniques supported by cross-platform frameworks, by using the comparative test method and will present the conclusions and issues that need to be considered when choosing the right technical solution. [ABSTRACT FROM AUTHOR]

In an effort to increase student participation and classroom interaction, universities are increasingly using student response systems which have been thoroughly investigated in terms of their educational value and potential. More often called clickers such systems enable students to answer questions through the use of handheld devices and can generate results in real-time. While traditional clicker systems with specialized hardware are still in use, contemporary systems utilize popular handheld devices such as phones and tablets. This paper presents an open-source clicker system that can be used in a classroom setting for anonymous polling using mobile phones. No financial costs are involved for students or universities since an institution's existing network infrastructure is utilized. We provide justifications and discuss design principles and development considerations involved in the construction of the system which primarily aims to support the instructor by minimizing the time and effort required to use it in a classroom setting. A focus group evaluation of the system with experienced instructors provided positive feedback, as well as, valuable suggestions for further improvements. [ABSTRACT FROM AUTHOR]

Living in an age of information and technology in which time is of the essence, people try to use their available resources and time as efficiently as possible. Because traditional methods of training and educating students have become obsolete, there is a need for new ways to approach and interactive training in the e-Learning system where these stand out as key factors in the society of tomorrow. This paper will also tackle the advantages and disadvantages of this mobile technology which requires a remote learning system. The purpose is to create flexible teaching solutions, which will allow access to information via all kinds of devices, as well as to produce flexible materials in a wide variety of situations. Furthermore, this paper will try to approach the answer to the question: how can we learn effectively? And how can we address the issue of limited availability of time using mobile technology? It is becoming more and more clear that mobile learning is not only just a fad, but is becoming an important part of individual development, regardless of age, gender, nationality, cultural background or social status. It is also desirable that future learning should work together with traditional learning, with m-learning and e-learning. In conclusion, the quality of educational system will increase, leading to the development of a new society based on a new core concept which will lead to an increasingly modern education. [ABSTRACT FROM AUTHOR]

Thanks to a recent British Council initiative Anadolu University, Okan University two universities in Turkey and a commercial trainer in Turkey are collaborating with one university, University of Wolverhampton in the United Kingdom on an exciting and innovative project. The use of mobile devices in formal education is still an emergent field and one where the socio-technical context is changing rapidly and is evolving differently in different countries and cultures. The focus for this project is the development, deployment and evaluation of a mobile app to support undergraduate/graduate programmes, initially aspects of marketing. The combination of the three universities creates a target student population covering both distance students, that is Open and Distance Learning (ODL), open and distance learning, and 'formal',that is face-to-face, students. The funding is to support capacity-building and knowledge-sharing, and teams from the partner institutions have worked together on surveying the digital 'habits', that is access, expectations and experiences of mobile digital technologies, of their very different staff and student populations. This paper describes work-in-progress and reports on the significance and context of the project, and on its early findings. [ABSTRACT FROM AUTHOR]

Considered a new concept until about a decade ago, mobile learning (mLearning) is now regarded as a natural and, in some circumstances, an essential learning technology. The key factors that made this development possible are the continuously decreasing prices and increasing capabilities of the mobile devices and infrastructure, as well as the growing need to be connected and learn anywhere and anytime. The great variety of mobile devices leads to various issues. One of the main technical issues is the need to make learning content available for different devices, which may be a costly and time consuming process. One increasingly popular technology for creating cross-platform content for mobile devices is HTML5, the latest revision of the well-established HTML standard. The purpose of this paper is to present the results of a research on the HTML5 support in selected mLearning tools. [ABSTRACT FROM AUTHOR]

The use of mobile devices and healthcare applications is increasing exponentially worldwide. This has lead to the need for the healthcare industry to develop a better understanding of the impact of the usability of mobile software and hardware upon consumer and health professional adoption and use of these technologies. There are many methodological approaches that can be employed in conducting usability evaluation of mobile technologies. More obtrusive approaches to collecting study data may lead to changes in study participant behaviour, leading to study results that are less consistent with how the technologies will be used in the real-world. Alternatively, less obstrusive methods used in evaluating the usability of mobile software and hardware insitu and laboratory settings can lead to less detailed information being collected about how an individual interacts with both the software and hardware. In this paper we review and discuss several innovative mobile usability evaluation methods on a contiuum from least to most obtrusive and their effects on the quality of the usability data collected. The strengths and limitations of methods are also discussed. [ABSTRACT FROM AUTHOR]

This paper is a pioneering attempt to utilize a Brownian motion (BM) process with drift to model the mobile radio channel under non-stationary conditions. It is assumed that the mobile station (MS) starts moving in a semi-random way, but subject to follow a given direction. This moving scenario is modelled by a BM process with drift (BMD). The starting point of the movement is a fixed point in the twodimensional (2D) propagation area, while its destination is a random point along a predetermined drift. To model the propagation area, we propose a non-centred one-ring scattering model in which the local scatterers are uniformly distributed on a ring that is not necessarily centred on the MS. The semi-random movement of the MS results in local angles-ofarrival (AOAs) and local angles-of-motion (AOMs), which are stochastic processes instead of random variables. We present the first-order density of the AOA and AOM processes in closed form. Subsequently, the local power spectral density (PSD) and autocorrelation function (ACF) of the complex channel gain are provided. The analytical results are simulated, illustrated, and physically explained. It turns out that the targeted Brownian path model results in a statistically non-stationary channel model. The interdisciplinary idea of the paper opens a new perspective on the modelling of non-stationary channels under realistic propagation conditions. [ABSTRACT FROM AUTHOR]

M-learning is a relatively new form of e-learning. The process of learning is based on the functional possibilities of modern devices for mobile communication. In the paper the main objects of the engineering education and the possibilities of the mobile devices for technical support of the education process are reviewed. The comparison of these two factors requires adaptation of the learning methodology and the control of the knowledge according to the new possibilities. [ABSTRACT FROM AUTHOR]

Starting with 'iFever', during the last five years, mobile devices became the next big step in the ITC industry with the next five anticipating their becoming the "de facto" Internet access devices. eLearning must migrate as well, in order to maintain its main purpose: delivering information and empowering knowledge acquisition. The mobile enabled Learning Management Systems must be a hybrid one, capable of delivering content and record user progress in various contexts both classical and mobile. Although the main focus in present times has been on how content should be designed for mobile delivery, the same question should be asked for Learning Management Systems, as well, how they should be designed to enable delivery of such mobile content. This paper analyses what are the main challenges for designing such an mLMS are, and how they can obey both the quite old requirements like the SCORM standard as well as the mobile devices characteristics such as discontinuous access to the LMS (due to Internet access limitations) within a session or between sessions, content faceting (adding mobile support for existing content), feedback from and synchronisation of multiple access points (mobile or desktop) in achieving learning goals and objectives by using cloud enabled architectures. We are addressing issues concerning content compatibility validation for mobile devices, aggregation of mobile content with analogous content, enhancement of existing content and how an mLMS should be storing asynchronous submission of learner progress data as well as synchronicity between desktop clients and mobile clients. The last concern involves analysing device delivery mechanisms, custom LMS clients for mobiles and capabilities that could be implemented by such clients in order to overcome the inherent limitations of a browser-only web application delivery system for mobile devices. Last but not least we address issues concerning accessibility of content, a feature often overlooked by mobile content in general. [ABSTRACT FROM AUTHOR]

All teachers are faced with decisions about allowing and/or encouraging the use of highly mobile devices in classrooms. Some writers in the literature, and many teachers, propose strict rules governing the use of highly mobile devices in class; other researchers demonstrate added value through the affordances of highly mobile devices in class (e.g., Swan, Kratcoski, & van t'Hooft, 2007). This paper will draw on recent research to clarify the main issues in this debate and help teachers in Higher Education (HE) to consider the best approach to adopt in their own practice. [ABSTRACT FROM AUTHOR]

With the introduction of mobile technology, user behavior has been changed. One of the most representative features of mobile channels is that it enables users to access services regardless of time and place. The mobile channel is expected to enhance the flexibility of users. We examine whether there is a difference in purchase behavior between users who adopted mobile channels and those who did not, in a context where purchase time is limited and early purchase gives potential financial merit, using a large dataset from high-speed railway service in Korea. An interesting issue is whether mobile channel makes users purchase earlier and increase the chance to get discounts. Our results using difference-in-differences estimation with propensity score matching show that people who adopted mobile channel purchase tickets later on average and at a higher price than those who did not adopt mobile channel. [ABSTRACT FROM AUTHOR]

Mobile technology is considered one the most important directions of the new knowledge based society concept all over the world. By using mobile devices, people have broken the time and space frontiers of communication, making the market of such gadgets grow rapidly and become leader of the new technological development. Mobile users are looking permanently for new specified software solutions to have access to the knowledge and digital content for educational purposes. This paper will describe in few words our effort to research and develop a mobile learning system and mobile knowledge system founded by a national research program PNII. [ABSTRACT FROM AUTHOR]

The mobile phone is no longer just a device that is limited simply to call or send and receive text messages, as with earlier models of this century. A decade later, has become a true media center with an increasing storage capacity, program implementers, network connections, TV, GPS geolocation, etc. We are presenting a research paper about designing web pages for mobile phones in an educational context. In the theoretical framework, we will study the current situation of mobile telephony as an educational resource. Then we will establish a framework of methodological approach based on the tools of the Web 2.0, finally arriving to the creation of mobile Web "Design of Web Pages in Educational Contexts"as part of the doctoral program at UNED MODELTIC. [ABSTRACT FROM AUTHOR]

More than a fifth of the world's population will soon have a mobile device and access to the Internet. With so many potential users, the mobile environment sets a fast place for development and, at the same time, requires sustainable education and training to allow users to overpass challenges and benefit of emerging perspectives and opportunities. The authors of this paper aim to approach case scenarios for web content delivery methods based on mobile technologies within universities and training centres. They present the template philosophy and illustrate the concept with template applications developed for the Mobile Learning Environment and explore their transformation into other domains of application. [ABSTRACT FROM AUTHOR]

This paper describes a mobile prototype capable of recognizing characters from a photograph of a medication package. The prototype was built to work on the iOS platform and was developed using Objective-C and C programming languages. The prototype, capable of recognizing text out of an image, included image processing algorithms, text processing algorithms, and techniques to search and handle information from a database. This prototype is presented as an option for capturing reliable and validated information by using new technologies available to the general population. [ABSTRACT FROM AUTHOR]

The occurrence of the Covid-19 pandemic has caused changes in public payment methods, with the aim of reducing the transmission of the Covid-19 virus through physical money. With so many mobile services available, payments made using e-wallets are more convenient and faster than conventional banking systems because they save time and money. Over time, people are getting used to using digital transactions as their payment method. This study focuses on the Continuance Intention to use E-Wallet during the Covid-19 Pandemic in Indonesia, with the influence of Perceived Value, and E-Service Quality on Customer Satisfaction, as well as Government Support, Customer Satisfaction, and Perceived Health Risk on Continuance Intention to Use. Total of 351 data were collected from the users of e-wallet in the Greater Jakarta Area of Indonesia and analyzed by deploying partial least squares structural equation modeling (PLS-SEM). Our results show that only the perceived health risk variable does not affect continuance intention to use. In the context of this study, the Covid-19 virus disease is no longer a motivating factor for e-wallet users to use e-wallet continuously. However, other variables show a positive influence on continuance intention to use. [ABSTRACT FROM AUTHOR]

Indonesia's 5G network deployment has faced challenges that have postponed the target to be available nationwide in 2022. However, with its potential to improve the interconnectivity of the people and increase business efficiency and effectiveness, the government still pushed the deployment of the technology. Therefore, this research aims to better understand these challenges and opportunities by offering the systems perspectives on the adoption of 5G. The study identified the sub-component and its relationship in developing the ideal 5G network deployment systems using a modified soft system methodology. It also lists recommendations for improvement after comparing the actual and conceptual models. [ABSTRACT FROM AUTHOR]

This paper presents a study on the HSPA+ technology and the impact it have on today's mobile communication networks. To this end we study how to use features such as MIMO (Multiple Input Multiple Output) and HOM (Higher Order Modulation) and how they can increase the data rate transfer per user. The extracted results show that we can increase the data transmission rate by varying the configuration of antennas and the modulation type, obtaining the maximum theoretical order of 43.8 Mbps and 23 Mbps in Downlink (DL) and Uplink (UL), respectively using 4x4 MIMO and 64-QAM (Quadrature Amplitude Modulation) modulation. These results are obtained based on the direct application or manipulation of existing models and integrated in a simulator implemented for this purpose. [ABSTRACT FROM AUTHOR]

Mobile phones are used by a wide range of people. Even children use mobile phone although they are in high risk group. Because of this, use of mobile phone should be evaluated based on valid and safe information and measurements. We can utilize mobile phone in a way we desire, that is, we can turn it off in order to avoid its radiation when we do not want to use it. However, we cannot control base stations; moreover we do not know where they are mounted. So, radiation of base stations has more importance than that of mobile phones in this respect. Additionally, some GSM service providers may prefer to conceal base station in a way people cannot notice when people are probably opposed to mounting of base station very close to their live space. In this paper, signal strength of base stations (900 MHz) in a pilot region were measured and recorded. The selected region was averagely 500,000 m2 and has 4 base stations. 53 measurement points were determined on the streets of the region. The measurement region had nearly 97 apartments and these apartments had between 400 and 500 flats. The population living in this region was between 1500 and 2000. The averaged signal strength over 53 points in this pilot region were estimated as - 72.7 dBm. The minimum and maximum measurements were recorded as - 87 and - 47 dBm, respectively. The standard deviation of the measurement values was calculated as - 8.5 dBm. [ABSTRACT FROM AUTHOR]

Mobile devices are changing the traditional way in which people engage in activities such as communication, entertainment, information, connect to the Internet and other services offered by companies and institutions that are more dificult to use. In this context, in the Academic Division of Computer Systems was proposed the development of a mobile application for grades query, which is described in this paper. [ABSTRACT FROM AUTHOR]

The demand for increased mobile phone subscribers requires an efficient radio network planning that involves an accurate prediction of path loss. Although various empirical path loss models are in use, they are suitable for a particular environment or a specific cell radius. In this paper, GSM 900 MHz mobile signals that are recorded experimentally, for five base stations in Hyderabad city, are considered for path loss analysis. The measured path loss is determined from the collected field strength data. Three standard prediction models namely, Cost-231 Hata model, ECC-33 model and SUI model are implemented. Based on the comparison of measured and predicted path loss exponents, Cost-231 Hata model is identified as the best suited model. In order to improve the prediction accuracy, this model is statistically tuned using Least Square algorithm. The initial offset parameter and slope of the model curve in Cost-231 Hata model are considered for tuning and new model parameters are estimated. The performance of the tuned model is evaluated using mean square error, root mean square error, standard deviation and relative error. The error statistics are estimated for the tuned model as well as the prediction models. The tuned model gives a mean error of 1.294, root mean square error of 4.764, standard deviation of 4.29 and a relative error of 12.75%. The results show that the errors are least for the tuned Cost-231 Hata model, compared to the implemented empirical models. This successfully validates the tuning methodology and suggests that the tuned model is more accurate for the specified environment. [ABSTRACT FROM AUTHOR]

Urban Traffic Network (UTN) can be represented as a directed graph say, G={V,E}, where V={v1,v2,v3.....,vm}, is a finite set of vertices and E={e1,e2.e3,...,en}, is a finite set of edges. The vertices of UTN are the road junctions or terminals and the edges are road segments. The Mobile Phone Network (MPN) around the UTN can also be represented as a graph say G'={T,E} with vertices T={t1,t2,t3.....,tl} and edges E={e1,e2.e3,...en} . The vertices t1,t2, t3.....,tl are the points on the road segments nearest to Base Transceiver Station (BTS) Cell centre and the edges e1,e2.e3,...en are the finite set of edges, same as the edges of UTN. In this paper, a method has been discussed to map a MPN onto a UTN. The mapping can be used for urban traffic management, such as counting the number of traffic users around a road junction. We have also stated and proved that "Any MPN graph can be constructed as an UTN graph". Further, we have used the application of the mapping in counting traffic users to find the traffic congestion levels. [ABSTRACT FROM AUTHOR]

The aim of this study is to investigate the university students' transition process from computer usage to mobile phone usage in different domains. In order to collect the data to perform the required analyses, a quantitative survey is applied to 172 college students in five different Turkish universities in 2011 fall term. The data are examined using Pearson's product-moment correlation analysis. In order to evaluate the results, correlation coefficient, means and standard deviations are used. According to the results, a statistical significant relation is found between mobile phones and PCs in the domains of social media usage, Internet usage, and e-mail usage. However, significant relation couldn't be found between mobile phones and PCs in gaming domain [ABSTRACT FROM AUTHOR]

IEEE 802.16 OFDMA network (WiMAX) is promising technology which defines PHY and MAC layer for fixed and mobile profile. The WiMAX systems need effective QOS to provide broadband wireless access. The interference is one of major problems in wireless networks, frequency reuse and Adaptive Modulation Scheme (AMC) and Hybrid Automatic Repeat request (HARQ) are different network deployment causes to retain network QOS. This paper is based on simulation of Signal to Interference plus Noise Ratio (SINR) in 802.16 systems, the QOS metric of throughput and outage probability are estimated, according to assessment criterions, the system Performance on combination of different frequency reuse and AMC and HARQ are evaluated. In our novel method, we found that combination of Fractional Frequency Reuse (FFR) and Aggressive AMC parameters with HARQ algorithm will give us the optimal network configuration which can be applied as reference parameters in the practical networks. [ABSTRACT FROM AUTHOR]

Since Android has become a popular software platform for mobile devices recently, many software repositories collect and archive Android applications to facilitate the dissemination of Android applications. As the number of new Android applications tends to be rapidly increased in the near future, automatic software categorization will be in great demand. Although there are many approaches proposed for automatic software categorization, they do not consider the challenges specifically for Android applications. In this paper, we propose an enhancement called LACTA based on LACT to tackle this problem. LACTA extensively employs Android domain knowledge in the process and uses LDA to extract meaningful software topics for classification. We have conducted empirical experiments with 42 applications. The experimental results show that LACTA has promising improvements under the consideration of Android domain knowledge. [ABSTRACT FROM AUTHOR]

It was found that in the disaster-hit area, a communication supporting system using the existing mobile ad hoc network techniques cannot function as expected and communication would be interrupted from time to time, since they have not taken into consideration the sleep operation that is a very frequently used means for users of mobile terminals to increase their battery life time. In order to solve the problem, this paper proposes a system model and two methods. The one is used to create a house-watching network taking charge of waking up the sleeping terminals, so that periodic or planned communication can be supported even though users freely get into sleep at their convenience. The other is used to incorporate the sleeping with the routing protocols, so that users' consideration for other people can be technically supported, and they can know if their terminals are functioning as routers, and when sleeping buttons of their terminals can be pushed down safely without interrupting the relaying in progress, and so without interfering with others' communication. These methods have been demonstrated to be effective by simulation experiments. [ABSTRACT FROM AUTHOR]

In this paper, we propose a prototype system to enhance the management of asthma condition in patients who are also users of mobile devices. This system provides convenience to patients as well as facilitates the interaction with their doctors. The enhanced interaction enables a timely and cost effective management of asthma conditions by both patients and medical practitioners. [ABSTRACT FROM AUTHOR]

This paper presents a simulation analysis of the impact of mobility on concurrent transaction processing over a mixture of mobile and fixed transactions. Our results show that the traditional concurrency protocol yield low throughput in mixture mobile and fixed environments due to the fact that traditional protocol cannot discriminate implications of restart of both types of transactions. As a result, the number of restarts can be unbounded and the ongoing mobile transactions that share the same wireless resources will be affected. We investigate adaptive adjustment the serialization order of transactions such that a conflict resolution should be give more rooms for mobile transaction. We show that by effectively capitalizing this information, the number of unnecessary restarts can be highly reduced. Based on the simulation analysis, we show that this protocol provide a significant performance gain in mixed transaction environments. [ABSTRACT FROM AUTHOR]

Data about moving objects have been collected in huge amounts due to the proliferation of mobile devices, which capture the position of objects over time. Studies about moving objects have been developed as a specific research area of Geographic Information Systems. Those systems are designed to process traditional, static or slowly changing, geospatial data. However, moving objects have inherent a dynamism that requires different approaches to data storage and analysis. This paper presents a review of the key concepts associated to moving objects and their characteristics, as well as the approaches proposed to store data about moving objects. For the analysis of moving objects, an overview of the existing data mining techniques and some future guidelines are also presented. [ABSTRACT FROM AUTHOR]

A wireless Ad-hoc network consists of wireless nodes communicating without the need for a centralized administration. In this paper, an ad hoc network model has been set up for different scenario. The performance comparison of the network has been analyzed for different protocol such as AODV & DSDV. For validation the results are compared with reported experimental data of AODV protocol. The performances of proposed network are evaluated in terms of throughput. Channel speed 11 Mbps and simulation time 600 sim-seconds have been taken for all different scenarios. It is observed that the simulation results are closely resembles with the experimental results and DSDV shows better performance compared with AODV, which is more than 5.01%. The performance will be degrade with mobility of the dynamic (giving mobility) network. [ABSTRACT FROM AUTHOR]

VLC (Visible Light Communications) technology represents nowadays a new paradigm that could have a significant impact on future wireless communications. Although this technology has many advantages, one of the most common problem generated by the use of optical communication systems (based on the light in the visible spectrum), is the increased degree of disruption of the communication channel under the direct sunlight influence. The purpose of this article is to present the technological developments specific to the VLC/IR-RF (Visible Light Communication / Infrared - Radio-Frequency) hybrid system developed in the framework of a scientific research project started in 2017, which were recorded during the first half of 2019. This system based on multiple sensory devices such as temperature, motion, light intensity, dust, IR and microbolometer sensors will present the ability of intelligent monitoring and control of indoor environments (houses, office buildings, universities, campuses, etc.). From the point of view of the final purpose of the project, this will result in a hybrid bidirectional optical communication system capable of supporting high transfer rates, increased resistance to the specific sunlight disturbance, and the possibility of transmitting sensory information over long distances. The previous experimentation activities undertaken during the project were based on the use of the Arduino UNO development boards. Currently, it has been chosen to replace them with the development boards based on the ARM Cortex-A53 processor, in order to improve the system's performance. The Arduino development boards have limited the performance of the communications system from the point of view of the transfer speeds and distances. The new Raspberry Pi development boards, being a complete operating and control system, presents high operational performances that can be used in favor of the final goal of the project. [ABSTRACT FROM AUTHOR]

Managers of social media platforms aggressively compete for users to stimulate user generated content on their sites. In this study, we delve into one tactic of this competition which has become increasingly popular, but has received limited attention, the extension of character limits. In this study, we investigate how extending length limits of posts may influence user engagement. As expected, findings from more than 7,000 users suggest that extending length limits increases the average length of posts. However, results also indicate that the magnitude of the effect is infinitesimal (only 2 characters). Further, results indicate that extending length limits significantly increases user engagement by enticing users into posting more actively. Finally, it appears that accessing the platform through tethered or mobile connection strongly moderates these effects; inasmuch as the observed changes to post length and volumes are only observed for PC users (versus mobile-only users). [ABSTRACT FROM AUTHOR]

Consumer location tracking is becoming omnipresent on mobile devices, producing vast volumes of behavior-rich location trajectory data. However, this comes at a cost - potential invasion of consumer privacy. Existing approaches to privacy preservation are largely unsuited for these new data, not personalized, and difficult to interpret the trade-off between consumer privacy and data utility. We propose a personalized and interpretable framework to enable location data collectors to optimize the privacy-utility trade-off. Validating on a sample of nearly one million location trajectories from over 40,000 individuals, we find that high privacy risks indeed prevail in the absence of data obfuscation. Outperforming multiple baselines, the proposed framework significantly reduces the privacy risk with minimal decrease in an advertiser's utility. As novel and powerful consumer location trajectory data become increasingly leveraged, we demonstrate its value and propose an interpretable framework to mitigate its risk while maximizing its value. [ABSTRACT FROM AUTHOR]