Abstract-In order to ensure that data stored on a medium such as a disk is not lost or damaged, a copy of that data is stored on another medium. Should the original data be lost or damaged, then the copy may be accessed to reproduce the original data. This paper explains a novel technique to backup and restore DBMS and all types of files and directory through XML and NET. With proposed Solution, user data will be safely protected from accidental delete, overwrite and viruses. Moreover, proposed methodology is compatible with both oracle and SQL Servers. In this approach, we use XML and Ionic zip file manager to deploy the application. Database structure and metadata of the documents are stored within XML format i.e. all the files and folders are stored using Extensible Mark-up language (XML) instead of data base. With XML, intended data will be created, stored and even transport by defining set of rules with encoding document and proposed algorithm. The main advantage with proposed work is database administrator can use simple XML encoded files to create and backup data from heterogeneous databases (oracle, SQL etc.) at any place instead of using complex tools and interfaces. Index Terms-Database management system (DBMS), extensible mark-up language (XML), graphical user inter face (GUI). I. INTRODUCTIONBackup is defined as a copy of data that can reconstruct from database or data-warehouse [1]. Data backup and recovery consists of set of procedures to protect database against data loss and reconstruct the database after any kind of data loss. A relatively simple backup and restore program helps to interface effectively with computer's operating system to backup data including files and directories stored on a hard disk to the tape drive and to restore such data from the tape drive onto the hard disk [2]. Backup can be stored at a specific folder where the file may be either in coded form or in normal form i.e. the application has two kinds of actions namely automatic and manual approach. In first approach, backup will be created automatically on widow's start up i.e. user cannot see interface [3]. At first start up, user needs to define automatic backup option. Subsequently, application will save the settings and data will be automatically gets backup from subsequent backups. In later Manuscript
Optimizing routes and paths improves network performance. Due to the encapsulation and tunneling of the packets, mobile IP-based communication contributes to packet drops or significant delays between the sender and receiver. Packet loss during handoff reduces TCP throughput as well. One solution is to use the IEEE 802.11 Medium Access Control (MAC) protocol and TCP or UDP models to increase routing protocol performance. In the linkage of homogeneous networks, it is challenging to determine route failure. In addition, the 802.11 MAC also uses a link connection. As a result, re-covering the entire route path takes a longer time. Thus, improving wired and wireless mobile node communication and handover is both challenging and critical. To overcome this challenge, we propose to use the Versatile Resilience Packet Ring protocol (VRPR)-based model. In this paper, we propose a novel VRPR-based network model that allows uninterrupted communication in both wired and wireless media. VRPR is used in the network layer to avoid buffer overflow and client mobility. Our new model also identifies the cause of the route failure, whether it is due to client mobility (handover), due to link breakage (channel degradation), or due to buffer overflow. We evaluate our network model based on three performance factors, namely, the delay, packet, and packet loss, and compared it between wired and wireless media. Our Enhanced-VRPR-based network model outperforms the current VRPR wired and wireless network models. We validate our model through OMNet++ simulations.
Abstract-The popularity of IEEE 802.11 networks comes with its low cost, high data rate and seamless handoff. With heavily utilized infrastructure based wireless networks, number of users are increasing rapidly which makes available unlicensed spectrum band more congested. Moreover, most of the IEEE 802.11 standards (b/g/n) operate on 2.4 GHz which has subject to interference with other services like Bluetooth, sensor networks and cordless phones. Hence, the performance of IEEE 802.11 MAC should be enhanced with respect to interference and spectral scarcity. In general, IEEE 802.11 networks operate on either DCF (Distributed co-ordination function) or PCF (Point co-ordination function) mode. This research paper mainly focuses on PCF mode IEEE 802.11g standard and explains the necessity of amendment in terms of frequency, throughput, net bit rate, maximum indoor range and maximum output range. OPNET Simulator is used to calculate network load, throughput and medium access delay. Moreover, calculated performance metrics are compared with different user probability for IEEE 802.11g networks.Index Terms-IEEE 802.11g, MAC, throughput, network load.
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