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Distance-Based K-Medoids Clustering
for Gene Expression Data
-- Geetha T and Michael Arock
This paper proposes K-medoids algorithm for clustering gene expression data. It improves the selection of initial
and updated medoids. Results of K-medoids clustering are mainly based on initial centroids; the proposed method helps
find the best initial centroids. In this approach, distance matrix is found once which helps select the first k smallest objects as initial medoids. The main features of the algorithm are: (a) Distance matrix is calculated only once and used in the
entire process. It avoids scanning of large database every time; and (b) No initial parameter requirement of k (number of clusters). Both these features help reduce execution time and the need for memory. The proposed algorithm is applied
on synthetic, genome expression and medical datasets. The outcomes are validated using various measures like Rand
index and FM index. Experiments show that the proposed algorithm runs faster and finds better results than the
existing algorithms.
© 2010 IUP. All Rights Reserved.
Intelligent Human Body Modeling
and Human Pose Classification Using Neural Networks
-- K Srinivasan, K Porkumaran and G Sainarayanan
With increased demand for security systems, video analysis plays an important role in surveillance systems. This
paper describes an intelligent visual surveillance system that detects the presence of the human body parts and actions.
The motion segmentation is achieved by background subtraction algorithm. The body parts such as head, torso and both
hands are detected individually from the segmented image. First, the head region is identified using the Vertical
Projection Histogram (VPH) algorithm. K-means clustering can be used to segment the skin regions of the monocular video
sequences. For the detected skin regions, 2D modeling has been implemented for pre-defined poses. The human pose
classification can be done by Feed forward Back propagation neural networks algorithm. In pose classification, ten poses are
considered. The proposed work is used to detect the skin regions even if the person wears half sleeved or full sleeved dress. Finally,
the efficiency of pose classification is also analyzed.
© 2010 IUP. All Rights Reserved.
A Textual Analysis of Digits Used
for Designing Yahoo-Group Identifiers
-- Jatinderkumar R Saini and Apurva A Desai
A tremendous increase in the use of the Internet for online communication is witnessed worldwide. Yahoo! Inc.,
provides one such service in the form of Yahoo! Groups. Each such group is identified and accessed using a unique group
identifier. This paper presents digit-wise statistics and a detailed analysis of the usage of digits based on the study of nearly
1,400 unique Yahoo group identifiers containing digits. The results show that one-fourth of the total usage of digits is
contributed by the digit 0, whereas the three digits 0, 1 and 2 collectively contribute more than 50% of the total digit usage. A
number of areas that influence the selection of a digit or digits by the users in the design process have also been identified. To
the best of our knowledge this is the first attempt to study online user behavior based on the usage of digits for designing
a unique online identifier.
© 2010 IUP. All Rights Reserved.
Determinants of Online Auction Success in
eBay Malaysia
-- Ching Seng Yap, Tuck Chun Loke, Wye Leng Saw,
Cheau Mei Wong and Chee Hao Wong
This study aims to examine the determinants of auction success in eBay Malaysia. The sample of this study comprises
the Internet bidders who bid for digital cameras on eBay Malaysia from June 1-June 30, 2009. Digital camera is chosen as it
is one of the top ten products Malaysians purchase on the Internet. Data are collected through observation of
auction transactions on eBay Malaysia. Seven determinants of auction successstarting price, reserve price, shipping
price, availability of payment via PayPal system, actual picture, `new in box' and `buy-it-now' optionare tested in this
study. The results reveal that auction success in eBay Malaysia is dependent on lower starting price, reserve price, availability
of payment via PayPal system and inclusion of the actual picture of the item being sold. Implications, limitations
and recommendations for future studies are also presented.
© 2010 IUP. All Rights Reserved.
Simulation of Pulse-Shaping FIR Filter for WCDMA
-- A S Kang and Vishal Sharma
Due to increasing demand for video signal processing and transmission of high speed and higher order, Finite
Impulse Response (FIR) filters have frequently been applied for performing adaptive pulse shaping and signal equalization
of received data in real time. Pulse shaping for wireless communication over time as well as frequency selective channels
is the need of the hour for 3G and 4G systems. Due to intensive use of digital filters in video and communication
systems, high performance in speed, area and power consumption is demanded. With the recent exploding research interest
in wireless communications, the application of signal processing to this area is becoming increasingly important. Indeed,
the advances in signal processing technology make the most of today's wireless communications possible and hold the key
to future services. The present paper deals with simulation model of square root raised cosine pulse shaping filter for
Wideband Code Division Multiple Access (WCDMA) with different parameters of the filter at 5 MHz.
© 2010 IUP. All Rights Reserved.
Content-Based Image Retrieval (CBIR):
State-of-the-Art and Future Scope for Research
-- Pradnya A Vikhar
Content-Based Image Retrieval (CBIR) is an active area of research since the past decade.
A lot of work is still being done in this area, which includes various applications such as security, medical imaging,
audio and video retrieval. It shows the growing interest of many researchers in this field which results in new tools and
techniques. This paper focuses on the key contributions of various researchers in the field of CBIR techniques. Then it discusses
some literature gaps found in the adaptation of existing image retrieval techniques to build useful systems. It also includes
the future scope of research in this field.
© 2010 IUP. All Rights Reserved.
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