http://dspace.ewubd.edu:8080/handle/123456789/1020 2026-04-04T22:34:58Z http://dspace.ewubd.edu:8080/handle/123456789/3741 Design and Development of Net Metering Through IP Based IoT Mimu, Sharmin Akter; Rahman, Muhammad Mashiur Energy efficiency and conservation have been a heavily focused subject in recent years. So, the importance of power meter has a significant effect. The thesis aims to develop a Net Meter though IP based IoT by using a bidirectional power meter where we were using a microcontroller (Arduino nano). Arduino nano which is used because it is cheap and has less PIN. The thesis constitutes a microcontroller (Arduino nano), an Ethernet shield, a current sensor, voltage sensor, bulbs as load, and a display. The RMS values of voltage and current are determined in the thesis and sowed on the screen. Then the Calibration is done inside the developed program. After that the power is Calculated and showed in the display. Then the direction of the power is determined, which is dependent on the phase difference between voltage and current coming from the grid. If there is no phase difference between the voltage and current, then the power is positive and leaving from the network. If there is a phase difference between the voltage and current, then the power is negative and entering the grid. The negative power is calculated by reversing the direction of the current sensor, but it can be also be detected by adding a power-producing device like a generator. The direction of the power flow is significant for efficiently using power. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Telecommunication Engineering of East West University, Dhaka, Bangladesh 2020-06-23T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/3659 Study on e-Health System in Bangladesh: Prospect and Challenges Afrin, Suborna Uses of ICT in health sector is increasing day by day all over the world. Modern equipment are being manufactured by Vendor Company and industry which is added value in health care sector. Recently in academia, various research is going on for getting optimum result by using modern equipment in health sector. Though Bangladesh is a developing country, it is not much lack behind that trend. Recently, a great impact of IT of health sector in Bangladesh become very visible. However, still in some sector of e-health, current scenario of Bangladesh is at its rudimentary stage and there are few gaps which need to be fulfilled at this stage. We identify these gaps and provide recommendation. In our work, first of all we try to analyze the scenario of multi packet perspective. Secondly, we compare the e-health system (electronic health record, electronic medical record, telehealth and telemedicine, mobile health) in Bangladesh with the other developed, developing and underdeveloped country. We also try to focus on the universal standard (HL7, FHIR, and CDA) of e-health practice and interoperability of health record data of DGHS website. We have tried to make a platform to migrate the data and also identified the challenge in doing this This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Telecommunication Engineering of East West University, Dhaka, Bangladesh 2019-12-24T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/3341 Performance Evaluation of Different QAM Modulation Schemes in a VCSEL Based Single Mode Optical Link Paul, Alok; Haldar, Dipta Vertical Cavity Surface Emitting Laser (VCSEL) is first demonstrated by K.Iga in 1979. Since then it creates a new era for high speed optical communication system. The most important feature of this optical device is that it can emit light vertically from its substrate surface rather than emitting from its side edge. This special feature of VCSEL provides capability of high speed data transmission very efficiently. That is why today in applications for long range and short range high speed optical communication VCSELs have replaced edge-emitting lasers. VCSELs are now widely used in analog broadband signal transmission, absorption spectroscopy, laser printers, biological tissue analysis, optical fiber data transmission and so many applications. From the beginning of VCSELs introduction, temperature variation always remains dominant contributor to performance degradation and instable output. As VCSEL is a rapid growing field for optical communication, it has to copewith very high temperature, which makes the design of VCSEL based system more complicated and challenging. As increasing temperature reduces a major portion of output power of VCSEL, meeting up the temperature variation issue is prime need for VCSEL based optical communication system. In this thesis, we analyzed and comparedthe temperature dependence, power consumption, BER and Q factor ofM-QAM modulation schemes at 1550nm wavelength for VCSEL based optical link. We further analyzed the performance of VCSEL by designing a long range data transmission system. It is found that at bias current of 2mA the working temperature range extends up to 1250C for 1550 nm. And at a bias current of 12mA, theminimum power dissipation is found to be 1.96mW at room temperature for 1550nm VCSEL based optical data transmission system at 10Gbps. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Telecommunication Engineering of East West University, Dhaka, Bangladesh 2018-02-23T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/2532 Study on Access Point and Bandwidth Management in Overcrowded WLANs by Matching Algorithm and Game Theory Sultana, Sadia; Sarkar, Anirban Wireless Local Area Networks (WLANs) have been widely developed during this decade, due to their mobility and flexibility. As WLANs have become popular in many sectors, so we have to manage it efficiently. In a typical deployment of WLANs, the coverage areas of nearby access-points(APs) usually overlap with one another and a host may detect signals from multiple APs which degrade the network performance. The main purpose of our work to minimize the number of active APs in a overcrowded WLAS and to develop a bandwidth sharing techniques to reduce the wastage of bandwidth. This study represents the management of APs in overcrowded WLANs. In this thesis, firstly, we analyze the relationship of number of access point (AP) and achieved throughput for a given scenario. In the scenario we consider a number of parameters, i.e. given area, topology, number of users, expected rate and channel allocation vector. We find that in general with the increase of AP the performance of overall network improve. However after a certain number of deployed APs, further increase of AP does not bring substantial improvement in the network performance. More specially, performance deteriorates after a threshold value of number of APs due to increasing interference between adjacent channel (or co-channel) interference. We verify the throughput increasing rate with proper management of APs by simulation results using WIMNET (Wireless Internet-access Mesh Network) simulator. Most of the cases we see that in an overcrowded WLAN, the host does not get their expected bandwidth. By using an effective bandwidth sharing techniques, this problem can be solved. In this research work, we‟ve also proposed about the bandwidth sharing techniques for a given scenario where the different operators can share their bandwidth with each other by applying matching algorithm and game theory model. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Telecommunication Engineering of East West University, Dhaka, Bangladesh 0008-01-01T00:00:00Z