Web mining is the application of the data mining which is useful to extract the knowledge. Web mining has been explored to different techniques have been proposed for the variety of the application. Most research on Web mining has been from a 'data-centric' or information based point of view. Web usage mining, Web structure mining and Web content mining are the types of Web mining. Web usage mining is used to mining the data from the web server log files. Web Personalization is one of the areas of the Web usage mining that can be defined as delivery of content tailored to a particular user or as personalization requires implicitly or explicitly collecting visitor information and leveraging that knowledge in your content delivery framework to manipulate what information you present to your users and how you present it. In this paper, we have focused on various Web personalization categories and their research issues.

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Background: Subarachnoid blockade amongst regional anesthesia has been most commonly used for performing abdominal and umbilical surgeries. There is persistent search for finding an adjuvant to local anesthetics to prolong its action along with hemodynamic stability. In this study we have used clonidine as an adjuvant to local anaesthetic agent and have assessed its ability to prolong motor and sensory blockade and hemodynamic stability. Methods: This observational study was conducted on 56 patients of ASA grade I/II, undergoing lower limb orthopedic surgeries who were divided into 2 groups: Group B : Injection 3.0 ml hyperbaric Bupivacaine 0.5% + 0.12 ml normal saline was given intrathecally and Group C : Injection 3.0 ml Bupivacaine (0.5% hyperbaric) + 0.12 ml injection clonidine (20 mcg) was given intrathecally. We compared duration of sensory and motor blockade, hemodynamic changes, duration of analgesia and complications in both groups. Result:  The onset of sensory and motor blockage was comparable in both groups. Duration of sensory and motor blockade was significantly longer in Group C than group B (P < 0.0001, P < 0.0001, respectively).

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