IMPROVING PERSONALIZED QUESTIONNAIRE WITH REDUNDANCY REDUCTION FOR ADDRESSING COLD USER PROBLEM

User-based and item-based collaborative filtering techniques are among most explored strategies of making products’ recommendations to Users on online shopping platforms. However, a notable weakness of the collaborative filtering techniques is the cold start problem. Which include cold user problem, cold item problem and cold system problem – i.e., the failure of collaborative filtering to make recommendation of products to a new user, failure of an item to be recommended, or combination of the two respectively. Literature investigation has shown that cold user problem could be effectively addressed using technique of personalized questionnaire. Unfortunately, where the products’ database is too large (as in Amazon.com), results obtained from personalized questionnaire technique could contain some user preference uncertainties. This paper presents technique of improving personalized questionnaire with uncertainty reduction technique. In addition, the paper presents classification of product recommendation systems. In this work we will be limited to user-based cold start. Experimentation was conducted using Movielens dataset, where the proposed technique achieved significant performance improvement over personalized questionnaire technique with RMSE, Precision, Recall,1 and NDCG of 0.200, 0.227, 0.261, 0.174 and 0.249

Conservative Neck Rejuvenation

In the field of facial rejuvenation, among the recurrent topics, one of the most discussed is the return to less invasive techniques. Lower face rejuvenation is best achieved acting on the platysma muscle. Many techniques are used and usually include platysma section, redundancy reduction, and redraping. Platysma plication is also used especially in secondary cases because of the increased risk of nerve injury due to possible anatomical damage caused by previous operations. A technique that preserves the deep planes based on a new plication method is proposed (conservative neck rejuvenation). In this technique, the dissection plane is only subcutaneous to reduce the risk of nerve injuries. An effective neck contouring is possible using a simpler technique with very good results and a lower rate of morbidity.