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Updates found with 'advantageous'

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Updates found with 'advantageous'

JAVA PROJECTS ABSTRACT 2016-2017: AN EXPLORATION OF GEOGRAPHIC AUTHENTICATION SCHEMES ABSTRACT: We design and explore the usability and security of two geographic authentication schemes: GeoPass and GeoPass- Notes. GeoPass requires users to choose a place on a digital map to authenticate with (a location password). GeoPassNotes—an extension of GeoPass—requires users to annotate their location password with a sequence of words that they can associate with the location (an annotated location password). In GeoPassNotes, users are authenticated by correctly entering both a location and an annotation. We conducted user studies to test the usability and assess the security of location passwords and annotated location passwords. The results indicate that both variants are highly memorable, and that annotated location passwords may be more advantageous than location passwords alone due to their increased security and the minimal usability impact introduced by the annotation.EXISTING SYSTEM: Passwords have well-known problems relating to their memorability and vulnerability to being easily guessed by an adversary. The security problems with passwords appear to be even worse than previously believed. To ensure security requirements are met, unusable password policies are implemented that cause an increasing burden on users. When passwords are forgotten, many systems rely on secondary authentication such as challenge (or “personal knowledge”) questions for resetting his or her password. Unfortunately, such methods also appear to offer questionable security. These issues motivate new user authentication strategies that have improved memorability and security.PROPOSED SYSTEM: People generally have better memory for images over words this has motivated many graphical password schemes that involve users remembering images (or parts of images) instead of words. We hypothesize that location passwords should be highly memorable under an appropriate system design; after all, map locations are visual, and represent places (which may be more “concrete” and easier to remember). A challenge that we tackle is designing location password interfaces that are memorable and provide security against guessing attacks. Therefore, we aim to enhance the security of location passwords by asking users to choose a note they can associate with their chosen location; we call this combination of the location password and its note an annotated location password. Users are authenticated by correctly entering both a location and an annotation. In essence, an annotated location password is using the location component to cue a user’s memory for text information; however, both components (location and text) are used together for stronger authentication. GeoPassNotes is our implementation of an annotated location password system.ADVANTAGE: stronger authentication The addition of the annotation is simple but purposeful Increase resistance to both online and offline attacks Reduce time for searching the route between the locations. Gives accurate details about the current location. User friendly. Reduces paper works. Easy communication between user and the admin.SYSTEM SPECIFICATION:HARDWARE REQUIREMENTS: System : Pentium IV 2.4 GHz. Hard Disk : 40 GB. Floppy Drive : 1.44 Mb. Monitor : 14’ Colour Monitor. Mouse : Optical Mouse. Ram : 512 Mb.SOFTWARE REQUIREMENTS: Operating system : Windows 7 Ultimate. Coding Language : Java. Front-End : Eclipse. Data Base : SQLite Manger.CONCLUSION:Passwords have well-known problems relating to their memorability and vulnerability to being easily guessed by an adversary. Passwords are forgotten. To overcome this type of problems we are using location as password. Thus we can overcome password forgotten problem because people have better memory over place than the passwords. Stronger authentication. The addition of the annotation is simple but purposeful. Increase resistance to both online and offline attacks. Reduce time for searching the route between the locations. Gives accurate details about the current location. User friendly. Reduces paper works. Easy communication between user and the admin. Thus geo authentication is explained.
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VLSI PROJECTS ABSTRACT 2016-2017 IMPLEMENTING MINIMUM-ENERGY-POINT SYSTEMS WITH ADAPTIVE LOGIC ABSTRACT: Timing-error-detection (TED)-based systems have been shown to reduce power consumption or increase yield due to reduced margins. This paper shows that the increased adaptability can be a great advantage in the system design in addition to the well-known mitigated susceptibility to ambient and internal variations. Specifically, the design tolerances of the power management are relaxed to enable even greater system-level energy savings than what can be achieved in the logic alone. In addition, the system is simultaneously able to operate near the minimum error point. Here, the power management is a simplified dc–dc converter and the TED is based on time borrowing. The target application is a single-chip system on chip without external discrete components; thus, switched capacitors are used for the dc–dc. The proposed architecture of this paper analysis the logic size, area and power consumption using Xilinx 14.2.EXISTING SYSTEM: Furthermore, the energy consumption of transmitting a bit across a given distance does not scale with Moore’s law as advantageously as the digital processing within a ubiquitous wireless node. Therefore, the energy cost of wireless transmission will proportionally grow when compared with digital processing. Increasing the energy efficiency thus requires increasing the amount of intranode processing to minimize the wireless transmission of data. The processor and the digital signal processor will thus become one of the, if not the, most important parts to be optimized. This will be compounded by the increasing functionalities within the node (video compression and analysis, machine learning, etc.). Ideally, the logic of IoT devices would operate at their minimum energy point (MEP). PROPOSED SYSTEM: For digital static CMOS logic, when the performance constraints allow, the straightforward solution to energy frugality is to lower the operating voltage, all the way to the MEP. The MEP has been proven to exist around 0.2–0.4 V depending on various factors. For process nodes down to 45 nm, this is in the subthreshold operation region and for smaller process nodes, in the near-threshold region. ADVANTAGES:• EDP is reduced• Reduce the power consumption DISADVANTAGES:• EDP is high• Power consumption is high SOFTWARE IMPLEMENTATION:• Modelsim• Xilinx ISE
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IEEE 2016 POWER ELECTRONICS ABSTRACTLCL FILTER DESIGN FOR THREE-PHASE TWO-LEVEL POWER FACTOR CORRECTION USING LINE IMPEDANCE STABILIZATION NETWORK ABSTRACT: These days, three-phase grid-connected PWM voltage source converters (VSCs) like two-level or multilevel converters are widely used in many applications. Trying to improve the power quality and attenuating the current harmonics generated by these converters leads to different approaches such as filter design and harmonic elimination/mitigation methods. To attenuate the harmonic contents at high frequencies one possible solution is relying on the inductor of three-phase boost VSC as a filter. Nevertheless, this solution leads to a bulky inductor with high power inductor losses. Besides, the large inductance value degrades the performance of the controller. Employing high order filters such as LCL, LLCL filters to fulfil the grid regulations are highly attractive solution and have been studied in many researchesEXISTING SYSTEM: The DC side of the rectifier consists of the DC capacitor and is connected to a load. Here, two LCL-filter configurations with different resonance frequencies are used. Choosing a higher filter capacitor yields to higher damping of the switching harmonics, but reduces the resonance frequency of the filter as it can be seen in the Bode diagram in Fig. 2.For the purpose of feedback the DC link voltage as well as the converter and line currents are measured. The line voltage is measured for synchronizing the control with the grid frequency. Here the space vector notation is used. The three-phase values are transformed into stationary reference frame and further, using the line voltage vector, into rotating dq coordinates in order to perform the voltage-oriented-control. From control point of view it is advantageous to control DC values since PI controllers can achieve reference tracking without steady state errors. As disadvantage the coordinate transformation leads to current dynamics coupling. PROPOSED SYSTEM: A method for designing an LCL filter for two-level PFCs using LISN. Using the equivalent circuit of the converter, the effect of LISN on measurement is studied. Filter parameters are, then, calculated by analyzing the equivalent circuit. In this paper, a passive damping method also is employed for improving the dynamic performance of the converter. Finally, a 5 kW three-phase PFC setup is used to verify the performance of the designed filter. The single-phase equivalent circuit not only simplifies designing the filter, but also helps to investigate the effect of LISN on circuit. To do that, the noise source must be defined. For an SPWM grid-connected VSC, using double Fourier analysis, the amplitude of ac link voltage at multiples of switching frequency (carrier frequency).ADVANTAGES:• Improved dynamic performance.• Low impedance network for the high frequency harmonics. APPLICATIONS:• High and low power applications.• Silicon-carbides (SiCs).
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IEEE 2016 POWER ELECTRONICS ABSTRACTA SENSITIVITY-IMPROVED PFM LLC RESONANT FULL-BRIDGE DC-DC CONVERTER WITH LC ANTI-RESONANT CIRCUITRY ABSTRACT: An asymmetrical half-bridge LLC resonant dc-dc converter has been gaining the popularity in a variety of switching power supplies encompassing from a small power ICT equipment, LED lighting, battery chargers for electric vehicles, to a dc micro-grid power distribution system due to a soft-switching operation over the wide range of load power; zero voltage soft-switching (ZVS) of active switches and zero current soft switching (ZCS) of rectifier diodes. The wide range of soft switching operation in the LLC converter is attractive for a full-bridge dc-dc converter topology as well, while a typical phase-shift pulse-width-modulation (PS-PWM) full-bridge circuit topology suffers from a severely-limited range of soft switching for load power variations. EXISTING SYSTEM: The switching bridge generates a square waveform to excite the LLC resonant tank, which will output a resonant sinusoidal current that gets scaled and rectified by the transformer and rectifier circuit, the output capacitor filters the rectified ac current and outputs a DC voltage. PROPOSED SYSTEM: This paper presents the performance of the LLC-LC resonant converter with the complete experimental results on soft switching performance, output voltage and power regulations, power conversion efficiency and loss analysis, including the design consideration of resonant tank parameters, all of which are not mentioned or evaluated in any past reference papers. Performance comparison between the LLC and proposed converters are presented in experiment, then the feasibility of the LLC-LC resonant topology are proven. Furthermore, the steady-state characteristics of the series and anti-resonant tanks are originally analyzed by the state-plane trajectory, which is truly effective for demonstrating the power and energy within the resonant tanks. ADVANTAGES:• The voltage step-down ratio increases by triple, and the output power range can improve by 30% as compared to a LLC converter.• The current though the power devices and components under the short-circuit load condition are reduced 44% as compared to the full load condition owing to the effect of the anti-resonant tank in the LLC-LC converter, where the anti-resonant frequency is designed in just 50% higher than the first resonant frequency.• This advantageous property contributes for protecting over-current in the case of the short-circuit load condition as well as the start-up interval in the designed band of switching frequency. APPLICATIONS:• Microgrid.• Transportation applications.
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IEEE 2016 POWER ELECTRONICS ABSTRACT: SWITCHED-COUPLED-INDUCTOR QUASI-Z-SOURCE INVERTER ABSTRACT: VSIs can perform only buck operations, while CSIs can perform only voltage boost inversions. Therefore, in applications that require both buck and boost operations, an additional dc–dc converter is needed, resulting in a two-stage power conversion with a higher system cost and volume, low efficiency, and complex control. Moreover, the shoot-through of power switches in one leg of a VSI, or an open circuit in the case of a CSI, can damage the switching devices, and is therefore prohibited. To address these limitations, an impedance-source inverter (ZSI), which advantageously used the shoot-through of inverter-bridge arms to boost the voltage, and therefore, exhibits single-stage buck–boost voltage inversion ability; it also has better output waveform quality due to the elimination of the dead time. Because of its obvious advantages, the ZSI has become a research hotspot in power electronics, with the focus being on pulse width modulation (PWM) schemes.EXISTING SYSTEM: The Z-source concept can be applied to all dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion. To describe the operating principle and control, this paper focuses on an application example of the Z-source converter: a Z-source inverter for dc-ac power conversion needed for fuel-cell applications. Above Fig shows the traditional two-stage power conversion for fuel-cell applications. Because fuel cells are usually produce a voltage that changes widely (2:1 ratio) depending on current drawn from the stacks. For fuel-cell vehicles and distributed power generation, a boost dc–dc converter is needed because the V-source inverter cannot produce an ac voltage that is greater than the dc voltage. PROPOSED SYSTEM: A combination of SC and a three-winding switched-coupled inductor (SCL) is applied to the qZSI, and the topology obtained is termed as switched-coupled-inductor quasi-Z-source inverter (SCL-qZSI). The proposed SCL-qZSI retains all of the advantages of the classical qZSI topology, such as continuous input current and a common ground between the dc-voltage source and the inverter bridge; it can also suppress the startup inrush current. The integration of the SC with SCL is beneficial in that it significantly enhances the boost ability of the SCL-qZSI with a smaller component count and lower turn ratio. The proposed inverter adds only one capacitor and two diodes to a classical qZSI, and even with a turns ratio of 1, its voltage boost ability B is higher than that of the existing high-voltage boost (q) ZSI and trans-ZSI, which were discussed before. Therefore, for the same input and output voltages, it can use lower D and higher M, which results in lower component voltage stresses, a better output power quality, and a lower input current ripple.ADVANTAGES:• lower component-voltage stresses, • It has better spectral performance, and• Has a lower input inductor current ripple and flux density swing or, alternately, it can reduce the number of turns or size of the input inductorAPPLICATIONS:• Industrial applications, such as adjustable speed drives, distributed power systems, and hybrid electric vehicles.
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