Telecommunication Platform Research Articles

Numerical study of a novel monolithic heat exchanger for electrothermal space propulsion

Fully-coupled multiphysics simulations are applied to investigate a number of candidate heat exchanger materials in the Super-High Temperature Additively-Manufactured Resistojet (STAR) thruster. Two mission applications are considered: a low earth orbit (LEO) primary propulsion application and a secondary reaction control system (RCS) application of an all-electric geostationary (GEO) telecommunications platform. High-temperature operation provides a significant increase in specific impulse over the state-of-the-art Xenon-resistojets. Inconel 718 is investigated for moderate-performance for LEO applications, while pure tantalum and pure rhenium are examined for the extreme temperature high-performance GEO application. Simulations determine the attainable performance including heat transfer, Navier-Stokes continuum flow and Joule heating physics in both transient and steady state. Nozzle efficiency, heat exchanger efficiency, electrical characteristics and other key performance indicators are explored.

Sequential-index pattern mining for lifecare telecommunication platform

Lifecare for quality-of-life improvement includes not only the prevention and treatment of diseases and health management anywhere and at any-time, but also the improvement of lifestyle, the psychological environment, and the emergency response. The construction of a sustainable model on the telecommunications platform as a solution has been constantly studied using intelligence information technology. In this study, sequential-index pattern mining on the lifecare telecommunications platform is proposed. The method is as follows. Various temporal and regional indices that are provided by the Meteorological Administration, Meteorological Data Open Portal, Public Data Portal, Healthcare Big Data Hub, and Korea Environment Corporation are collected as lifecare index data. The collected index data are transmitted to the NAS file server of the lifecare telecommunications platform using peer-to-peer (P2P)-based interconnection technology and high-performance computing. The sequential relationships among the indices are discovered to consider the semantic relationships. Using the AprioriAll mining algorithm, the maximum sequence is determined to find sequential relationships in the frequent sequence set. To process the pattern extraction and computation efficiently, recomposed transactions are stored in the high-performance NAS file server. Also, a mining-index prediction model is developed in consideration of the sequential relationships to complement the weakness of the statistical time-series analysis. Since the regional meteorological conditions are similar, the index sequential pattern can solve the problem of the generation of omissions or errors regarding the real-time monitoring data that are due to the monitoring equipment or communication failures. Therefore, the proposed sequential-index pattern mining can be utilized as a lifecare tool for risk-factor detection, risk prediction, and trend analysis.

Cellular Network Planning Toward 2021 Case Study: Bukit Raya District Pekanbaru

Due to the advancement of telecommunication platform, users are now demanding high performance application. Propagation models play a vital role in the characterization and design of wireless and mobile communications networks. However, if they are utilized in a different environment than the one they were formulated for, propagation path-loss models may produce unacceptable deviation in predictions. Nowadays every mobile service provider continues to build a telecommunications tower with little regard for its impact on the area function. This paper presents the cellular network planning in the district of Bukit Raya, Pekanbaru. From the field survey, there are found sixty-two (62) cell sites. This number is extremely large compared to the calculated one. From the theory, only twenty-five (25) cell sites are required. Thus, it was found inappropriate deployment cell sites.

Model of the managment and control device for mobile radio systems

The article presents a mathematical model of a common panel for control and monitoring (PCM) of combined mobile radio engineering systems and its physical interpretation. The model describes management as a ramified process, the functions of which are entrusted on the PCM, the actual model of the PCM containing objects of different importance, among which the generator of orthogonal piecewise-continuous functions is distinguished, process of monitoring the state of objects. The physical interpretation of the above components of the model is determined. It involves the management of a mobile radio engineering system carried out from a remote control, which has in its composition a generator of orthogonal piecewise-continuous functions. The obtained results can be used for telecommunication platforms, which combined various types of communication, devices for monitoring objects and the state of data transmission paths, radar systems of detection, recognition, tracking and guidance. An example of a combined telecommunication platform is shown mobile digital troposcatter-radiorelay station.

A Dynamic Resilience Approach for WDM Optical Networks

AbstractOptical fibres have been developed as a transmission medium to carry traffic in order to provide various services in telecommunications platform. Failure of this fibre caused loss of data which can interrupt communication services. This paper has been focused only on survivable schemes in order to guarantee both protection and restoration in WDM optical networks. In this paper, a dynamic resilience approach has been proposed whose objective is to route the flows in a way which minimizes the total amount of bandwidth used for working and protection paths. In the proposed approach, path-based protection is utilized because it yields lower overhead and is also suitable for global optimization where, in case of a single link failure, all the flows utilizing the failed link are re-routed to a pre-computed set of paths. The simulation results demonstrate that proposed approach is much more efficient as it provides better quality of services (QoS) in terms of network resource utilization, blocking probability etc. as compared to conventional protection and restoration schemes. The proposed approach seems to offer an attractive combination of features, with both ring like speed and mesh-like efficiency.

Remote-Controlled Laboratories of Experimental Physics: Measuring the Stiffness of a Spring

In modern E-Learning, students and scientists will be able to access Web portals for scientific computer and data infrastructures, thus accessing large collections of data and digital objects using metadata, knowledge management techniques, and specific data services. Students will apply existing scalable Web and grid technologies to access and share scientific data, using educational and computing resources to run scientific Practical exercises. Such an approach will allow the creation of enriched interactive through a real devices and real remote mechanisms that interactively support the exploration of scientific phenomena. Advanced repository and collaboration services will allow students to remotely and securely up- and download science and engineering learning objects. E-lab is essentially created to realize experiments by interacting with real devices that are real remote mechanisms, through an appropriate telecommunications platform, equipped with a dedicated management system and a number of software interfaces and material. Our works is aiming to : Measurement of the rigidity of a spring. This method translator pedagogical experiences and turn them into reality at an affordable, expand research sources to students.

Telehomecare telecommunication framework - from remote patient monitoring to video visits and robot telepresence.

Over the last few years, the number of remote patient monitoring (RPM) products and of videoconferencing systems has exploded. There is also a significant number of research initiatives addressing the use of service robots for assistance in daily living activities. From a technological standpoint, providing telehomecare services is certainly feasible. However, one technological barrier is to have access to a telecommunication platform that can be adapted to address the broad range of specifications and requirements of clinical and telehealth applications. Handling the full spectrum of possibilities requires a telecommunication framework that can transmit vital sign data from patients to clinicians, bidirectional audio-video from a standard computing device, and also multiple video streams and bidirectional transmission of control data. This paper presents a framework that integrates such capabilities. It also illustrates the versatility of the framework by presenting custom-designed devices allowing integration of capabilities ranging from RPM to video visits and robot telepresence.

Mantle cloaking for co-site radio-frequency antennas

We show that properly designed mantle cloaks, consisting of patterned metallic sheets placed around cylindrical monopoles, allow tightly packing the same antennas together in a highly dense telecommunication platform. Our experimental demonstration is applied to the relevant example of two cylindrical monopole radiators operating for 3G and 4G mobile communications. The two antennas are placed in close proximity, separated by 1/10 of the shorter operational wavelength, and, after cloaking, are shown to remarkably operate as if isolated in free-space. This result paves the way to unprecedented co-siting strategies for multiple antennas handling different services and installed in overcrowded platforms, such as communication towers, satellite payloads, aircrafts, or ship trees. More broadly, this work presents a significant application of cloaking technology to improve the efficiency of modern communication systems.

Bi-objective optimization of maintenance scheduling for power systems

Enhance the quality of energy production in power generating stations and reducing its cost have become of paramount importance. One of the methods to reach that goal is by minimizing the maintenance scheduling time. For this purpose, a new competitive mechanism, based on a modified genetic algorithm (MGA), has been proposed to perform the preventive maintenance (PM) scheduling. Firstly, a mono-objective optimization (makespan) has implemented, and the results were quite good. Secondly, and in order to benefit from the waste time, a bi-objective optimization was developed to find a trade-off between makespan and training time of operators. Finally, the MGA-based maintenance scheduling was tested on a hybrid renewable power system (HRPS), that uses photovoltaic modules and a fuel cell (PV/FC) as sources and the telecommunication platform as load, the obtained results have proved the high efficiency of the proposed MGA-based maintenance scheduling.

The development of telerehabilitation in China: a systematic survey

Background: In China, 70 million people suffer from chronic diseases and call for timely rehabilitation service [1]. This number is estimated to grow over 50% of the whole population by the year 2030 [2]. However, current medical resources cannot meet such huge demand. Furthermore, the distribution of these resources in China is not equal. Most of the rehabilitation professionals are centered in large tier 3 hospitals of the big cities. One of the studies shows that about 56% of local community hospitals do not have department of rehabilitation, and most community rehabilitation professionals are primary physicians, only one-fourth of them receive formal rehabilitation education and training [3]. Telerehabilitation, which provides timely rehabilitation services and education, was hence expected to meet this challenge. Aim: Through this systematic review, we aimed to understand the status of development of telerehabilitation in China, to discuss whether telerehabilitation is conducive to meet the challenges of Chinese rehabilitation service. Methods: A systematic review was conducted on the development status of Chinese telerehabilitation. The major representative databases were searched: PubMed, CNKI, Wanfang, and CQVIP. Additionally, we searched for published research protocols, conference proceedings and governmental reports on telerehabilitation since 2009. Findings and discussions: We have identified several large-scale telemedicine systems in China [4]. These systems have established a telecommunication platform for diagnose and supervision between tier 3 hospitals and other smaller hospitals. Patients and doctors hence can seek advice online from experienced rehabilitation specialist distantly. In addition, a growing number of telerehabilitation technologies are emerged in China, such as computer aided rehabilitation evaluation system based on the neural function assessment scale, cognitive rehabilitation training system based on virtual reality technology, exoskeleton remote rehabilitation system based on browser/server structure and rehabilitation robotics [5-12]. This indicates that telerehabilitation technology is receiving a growing attention in China. However, it is suggested that there should be more large scale random control trial in relation to the implementation of the technology. Evaluation on its economic effect should also be performed.

Design and Implementation Based on Telecommunications Platform Electronic Lottery Sales System

This product is based on the telecom platform and unified payment platform completed using telephone, web pages and then complete the purchase of electronic lottery deducted by telecommunication unified e-commerce system. The system is designed to provide users with a convenient and secure electronic concise quick way to buy lottery tickets. On the one hand you can use fixed telephone IVR(interactive voice response) to achieve electronic lottery purchases, it’s of ways to buy at the same time. On the other hand you can also buy lottery tickets, select the number and Check winning information on it 。This unified payment system is provided by the unified payment platform the cost of buy lottery tickets will deducted from the bill in uniform. In addition, this system can provide a detailed list of rates inquiries.

Saving Costs using Smart Call Routing: Aligning Business and IT through Finance

This case describes the effective information technology (IT) business alignment considerations that led to the successful implementation of a telecommunication platform designed to efficiently route cell phone calls in a financial institution in Chile. The company had several branches throughout the country, including its headquarters in Santiago. This initiative was part of a Technology Cost Savings strategy generated in response to the 2008 crisis. The idea behind it was to align internal business leaders with the IT team in order to optimize these costs, realizing a more efficient telecommunication platform, and to work together, as several cost-reducing initiatives were being executed at the same time. Achievements were thoroughly reviewed by the board of directors, and thus pressure to clean up the house was high. At that time, when users called a cellular phone from a landline, the call was charged using a fee much higher than a mobile company rate. The goal of the project was naturally to optimize these charges. An automatic call routing was designed, discussed and executed with the participation of the business leaders, based on each branch's demand and projected growth. The case relates the project lifecycle: the mistakes made at the beginning, the initial platform tests and bottlenecks, the rejection and frustration of the business, and a posterior crisis control and recovery phase. IT alignment and sponsorship from the directors were crucial, as there was no way back. All these factors, plus the additional IT activities competing for business attention, made this project both a challenging and learning experience.

LTE Cellular Network Planning for Urban Area

Due to the advancement of telecommunication platform, users are now demanding new applications such as Online Gaming, mobile TV, Web 2.0, and to meet this requirement operators needed to design more flexible network. To fulfill the requirements, 3rd Generation Partnership Project (3GPP) works on the Long Term Evolution (LTE) and propose a system which has larger bandwidths (up to 20 MHz), low latency and packet optimized radio access technology having peak data rates of 100 Mbps in downlink and 50 Mbps in the uplink (Magdalena, 2007; Motorola, 2007; Skold, 2009). Offering a greater coverage by providing higher data rates over wider areas and flexibility of use at existing and new frequency bands plan is a major challenge. In this paper, we are analyzing practical coverage scenario in an urban area (i.e. Kolkata) in terms of received signal levels, total noise, interference, throughput, and quality factor for downlink signal level.

Design, modeling and control for a stratospheric telecommunication platform

The stratospheric airship provides a unique and promising platform for broad band telecommunication relay missions, which combine the advantages of both terrestrial and satellite communication. In this paper, the conceptual design, dynamics modeling and attitude control of the stratospheric telecommunication platform are presented. First, the stratospheric telecommunication platform is introduced, including conceptual design, configuration, energy sources, propeller and payload. Second, dynamics model of the platform is derived form the Newton–Euler formulation and the station-keeping attitude control problem is formulated. Then, the adaptive fuzzy sliding mode control scheme is proposed to develop the attitude-tracking control system, with a particular focus on parametric uncertainties and external disturbances. Finally, simulation results verify the effectiveness and robustness of the proposed control scheme. The proposed conceptual design and control scheme provide a promising approach for telecommunication relay missions using the stratospheric station-keeping airship.

Introduction to the special issue: The development of episodic foresight

This study aimed to develop Iranian online banking scenarios using the cross-impact matrix approach. In the present study, first, by reviewing the literature and interviewing experts, twenty-four factors affecting online banking were extracted to develop plausible scenarios. Then, the variables affecting the future of online banking were directly and indirectly estimated using a questionnaire and analysis by MICMAC software. Finally, according to the two most significant factors, “telecommunication and network platforms” and “online banking experts,” plausible scenarios for the future of Iranian online banking were developed. According to the research findings, four scenarios were presented. These scenarios included Mars, Captainless Ship, Nike, and Janus. In the first scenario, “Mars,” no network and telecommunication platform is underlying online banking, and there are no experts, nor is there any intention to recruit them. The second scenario, “Captainless Ship,” is based on the fact that there are facilities and infrastructure, but there is no expert and knowledgeable person to manage and control the work. In the third scenario, “Nike,” everything works well. Under such circumstances, the future of the online banking industry will be pretty promising and ideal, there are good telecommunications and network platforms, and highly specialized professionals and managers perform well. Finally, in the fourth scenario, “Janus,” experts are hired, but there are no network and telecommunication infrastructure and facilities to advance the work.

Scheduling scheme of MAC layer for stratospheric telecommunication platform

To satisfy the protocol and requirements of different services flow of the stratospheric telecommunication platform, a scheduling scheme that could meet Medium Access Control (MAC) layer QoS and dynamic bandwidth allocation was proposed. The proposed scheduling scheme allocated up link and down link bandwidth not only to Mobile Station (MS) by Mobile Center Station (MCS) but also to all types of traffic in MS simultaneously and dynamically. At last, the simulation on the slot of different services flow, different delay characteristics of the traffic and different algorithms in the same services prove the feasibility of the scheme.

Scheduling scheme of MAC layer for stratospheric telecommunication platform

Scheduling scheme of MAC layer for stratospheric telecommunication platform

Is HAPS Viable for the Next-Generation Telecommunication Platform in Korea?

HAPS is a promising technology capable of providing broadband multimedia services as an alternative to the satellite communication system or terrestrial network. In this study, economic aspects of HAPS service are analyzed, HAPS services are defined, and revenues from the defined services are forecasted assuming nine scenarios. Capital expenditure as well as operating expenditure is estimated. To evaluate the profitability of HAPS service, the net present value (NPV), payback period, and the internal rate of return (IRR) are calculated. The results show that HAPS is economically justifiable in all the scenarios. Assuming that ARPU for the service is $35 per month in the average scenario, NPV is calculated as $2964 million, IRR becomes 31.9%, and payback occurs in 2017, which implies that HAPS service is profitable in Korea. In addition, the results of the sensitivity analysis show that the results are fairly robust.

Optimized hand-over scheme based on SIP for stratospheric telecommunication platform

In the Stratospheric Telecommunication Platform,when the user equipment(UE)mobiles to another Platform,his IP address will change.If the UE changes access technology he will automatically get a new IP-address.After this reassignment of the IP-address the UE has to re-register to the IMS and send new invites to all corresponding nodes before the sessions can continue.This will potentially introduce a long delay of ongoing sessions.In this paper,a solution was introduced to reduce the handover delay by sharing the registration information and call states of the UE.The full register and invite flows were not necessary in that case,since the servers in the IMS already had state information about the UE and sessions from the context transfer.The benefit with respect to reduced hand-over delay was theoretically analyzed in the quantity of signaling packets and the delayed of rebuilding the communication.An OPNET simulation was carried out to verify the solution.

A Decision Support System for Telemedicine Through the Mobile Telecommunications Platform

In this paper we have discussed the application of artificial intelligence in telemedicine using mobile device. The main goal of our research is to develop methods and systems to collect, analyze, distribute and use medical diagnostics information from multiple knowledge sources and areas of expertise. Physicians may collect and analyze information obtained from experts worldwide with the help of a medical decision support system. In this information retrieval system, modern communication tools such as computers and mobile phones can be used efficiently. In this work we propose a medical decision support system using the general packet radio service (GPRS). GPRS, a data extension of the mobile telephony standard Global system for mobile communications (GSM) is emerging as the first true packet-switched architecture to allow mobile subscribers to benefit from high-speed transmission rates and run JAVA based applications from their mobile terminals. An academic prototype of a medical decision support system using mobile device was implemented. The results reveal that the system could find acceptance from the medical community and it could be an effective means of providing quality health care in developing countries.