International Journal of Computer Applications (0975 – 8887) Volume 65– No.25, March 2013 47 Outlier Detection in RFID Datasets in Supply Chain Process: A Review Meghna Sharma Assistant Professor (Sr. Scale), Department of CSE/IT, ITMU, Gurgaon, Haryana Manjeet Singh, PhD. Associate Professor, Department of CS YMCA University, Faridabad, Haryana ABSTRACT Outlier detection has been a very important concept in the realm of data analysis. Most real-world databases include a certain amount of exceptional values, generally termed as “outliers”. The finding of outliers is important for improving the quality of original data and for reducing the impact of outlying values in the process of knowledge discovery in databases.. Outlier detection has been researched within various application domains and knowledge disciplines. Supply Chain Process is one of the popular and important domains. The implementation of RFID leads to improved visibility in supply chains. However, as a result of the increased collection of data and data granularity, new data management challenges are faced by supply chain participants new techniques for outlier detection are experimented. In this Paper the problem of detecting outliers in RFID readings stream. is addressed and considering the stream based ,spatio- temporal nature of RFID datasets, density based outlier detection technique is concluded to be the best among all the existing approaches. for outlier detection General Terms RFID, Outlier Detection Keywords Outlier Detection, RFID, Supply chain process Density Based, Data Mining. 1. INTRODUCTION Introduction is divided into two major sections. First section describes about basics of Radio Frequency Identification, RFID in Supply Chain Process, and Architecture of RFID Warehouse. Next Section gives introduction to Outlier Detection and description of Outlier Detection in RFID Supply Chain Datasets. 1.1 RFID Radio Frequency Identification (RFID) is a type of automatic identification system. An RFID system enables the transmission of data by a portable device, called a tag, which is read by a reader of RFID and processed according to the requirement of any specific application. The data transmitted by the tag provides identification or location information, or tagged product specifications, such as price, color, date of purchase, etc. The use of RFID in tracking and access applications first appeared during the 1980s. RFID quickly gained attention because it can track moving objects very quickly and that too in an automated ways. In a typical RFID system, an inexpensive tag with a transponder with a digital memory chip recognized by a unique electronic product code, is put along with individual objects An antenna with a transceiver and decoder, emits a signal and read data from and write data in it, by activating the RFID . After passing of an RFID tag through the electromagnetic zone, the antenna or interrogator detects the reader's activation signal. The data encoded in the tag's integrated circuit (silicon chip) is decoded by the reader and is passed to the host computer for its further processing. Figure 1 gives the basic structure of RFID system. The applications of Radio Frequency Identification (RFID) are one of the most emerging key components in object tracking and supply chain management systems. In future almost every major retailer will use RFID systems to track the shipment of products from suppliers to Warehouses. This data along with providing an insight into shipment and other supply chain process efficiencies is also capable of determination of product seasonality and other trends and provides very important information and analysis for the company’s plans. So many advanced uses of RFID are being explored in a wide range of applications. For example, tire manufacturers plan to embed RFID chips in tires to determine the tire deterioration. Many pharmaceutical companies are embedding RFID chips in drug containers to better track and avert the theft of highly controlled drugs. Airlines and satellites are considering RFID-enabling key onboard parts and supplies for the optimization of aircraft maintenance and turnaround time of airport gate preparation. .