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Assessment of quality of data warehouse multidimensional model

International Journal of Information Quality 2011年第4期2卷 344-358页

作者： Gosain, Anjana Sabharwal, Sangeeta Nagpal, Sushama University School of Information Technology GGSIPU New Delhi-110006 India Computer Engineering Division Netaji Subhas Institute of Technology Dwarka New Delhi-110078 India

Data warehouses are large repositories designed to enable the knowledge workers to take better and faster decisions. Due to its significance in strategic decisions, there is a need to assure data warehouse quality. One of the factors affecting the data warehouse quality is multidimensional model quality. Although there are some useful guidelines for designing good multidimensional data models, but objective indicators, i.e., metrics are needed to help designers to develop quality multidimensional models. Few researchers have proposed quality metrics for multidimensional models for data warehouse. These metrics need to be theoretically as well as empirically validated in order to prove their practical utility. In this paper, empirical validation using controlled experiment is carried out. We not only evaluate the effect of individual metric but also evaluate the effect of various combinations of metrics on data warehouse model quality specifically understandability, in order to best explain the variance of dependent variable due to independent variables. The results show that these metrics may be used as objective indicators for understandability. Finally, accuracy of our model in predicting the multidimensional model quality is also evaluated. © 2011 Inderscience Enterprises Ltd.

关键词： Data warehouses

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Design optimization using Genetic Algorithm and Cuckoo Search

Design optimization using Genetic Algorithm and Cuckoo Searc...

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IEEE International Conference on Electro-Information technology

作者： Anil Kumar Shampa Chakarverty Faculty of Technology Delhi University New Delhi India Division of Computer Engineering Netaji Subhas Institute of Technology New Delhi India

Genetic algorithm (GA) is widely used for embedded system design optimization. GA needs repeated evaluation of fitness function, but for complex embedded systems fitness function evaluation is costly as it includes multiple objectives. A recently proposed Cuckoo Search (CS) method does not require repeated evaluation of fitness function and can provide a set of optimal solutions within a reasonable time. This paper compares the application of GA and CS algorithm to the problem of design space exploration and discusses their empirical comparison.

关键词： Genetic algorithms Design optimization Algorithm design and analysis Hardware Embedded systems

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Analyses of web usage mining techniques to enhance the capabilities of E-learning environment

Analyses of web usage mining techniques to enhance the capab...

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International Conference on Emerging Trends in Networks and computer Communications (ETNCC)

作者： Anuradha Yadav Satbir Jain Department of computer Engineering Netaji Subhas Institute of Technology Delhi University New Delhi India

World Wide Web is today the most important media for collecting, sharing and distributing information. Education is one of the fields where web-based technology has been quickly and successfully adopted. Web mining is active research area which involves transformation and interpretation of web data to find out the hidden information by using various data mining techniques which will be useful in enhancing E learning environment. Web usage mining for e learning environment can mine the server logs to find the user usage pattern so that users can be provided with more personalized services. WUM is one of the latest techniques in web data mining which can provide an effective platform to the learner. We focus on identifying learning pattern of learners. This paper introduces how by using WUM techniques we can make e learning environment more effective. Based on WUM technique how we can design an effective e learning environment and implementation of the model builds more intelligent system and can promote interest of learners or learning environment is modifying its behavior to reflect learning style.

关键词： Data mining Electronic learning Servers Web pages Navigation Knowledge engineering computers

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Simulation and control of reactive distillation column

Simulation and control of reactive distillation column

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India International Conference on Power Electronics (IICPE)

作者： Ujjwal Kapoor Asha Rani Vijander Singh J. R. P Gupta Instrumentation and Control Engineering Division Netaji Subhas Institute of Technology University of Delhi New Delhi India

The paper discusses about the application of PID controller and fuzzy controller in reactive distillation column. A generic mathematical model of reactive distillation has been taken for simulation. The PID and fuzzy controllers are designed for the process and then the overall process is controlled by using conventional (PID) and intelligent (fuzzy) controllers separately. Conventional PID controller is used to control the temperature of the column and then it is replaced by fuzzy controller and then the results from both the controllers are compared.

关键词： Distillation equipment Feeds Temperature control Process control Temperature sensors Steady-state

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Design of fractional order differentiators and integrators using indirect discretization scheme

Design of fractional order differentiators and integrators u...

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India International Conference on Power Electronics (IICPE)

作者： Richa Yadav Maneesha Gupta Advanced Electronics Lab Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology New Delhi India

This paper attempts to find the rational approximation of fractional order differentiators and integrators and their discretized transfer functions by using continued fraction expansion (CFE) based indirect discretization scheme. Schnieder 2 nd order rule and Al-alaoui's 2-segment rule are considered for indirect discretization approach and differentiators and integrators of order ½ and ¼ based on these two rules are presented. The rational transfer functions are first tested for minimum phase and stability then the resultant rational approximations are discretized by using s to z transforms. These discretized transfer functions are checked for stability again after performing approximation process. Simulation resultant curves are drawn with the help of MATLAB for the magnitude responses, absolute magnitude errors and the phase responses of the stabilized discrete transfer functions. These curves are then compared with each other and the corresponding ideal characteristics of differentiators and integrators.

关键词： Approximation methods Equations Thermal stability Poles and zeros Stability criteria

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Optimizing Energy through Parabola Based Routing in Underwater Sensor Networks

Optimizing Energy through Parabola Based Routing in Underwat...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Sanjay K. Dhurandher Mohammad S. Obaidat Siddharth Goel Abhishek Gupta CAITFS Division of Information Technology Netaji Subhas Institute of Technology University of Delhi New Delhi India Department of Computer Science & Software Engineering Monmouth University NJ USA

This paper looks into the problems faced by Underwater Sensor Networks (UWSNs), with regard to energy optimization and efficient data delivery. A new algorithm is proposed which uses the properties of a "Parabola" in order to transmit data packets from source to destination. The scheme is called the "Parabola-based Routing"(PBR) algorithm. The algorithm is adaptive, and transmits packets in hop-by-hop fashion. Each node in the scenario is aware of its location in the form of its Cartesian coordinates. These coordinates help the nodes in the formation of the parabola for packet sending, as well as in knowing the location of other nodes. The best suited node is selected every time so as to maintain low probability of data transmission failure and optimum energy consumption thereby, using greedy approach every time in selecting the node for packet transmission. In order, to maintain the packet delivery ratio, a hop-by-hop "acknowledgement process" has also been devised. We have validated the efficiency of our algorithm through simulation analysis. The simulation results indicate a better performance of PBR over DSR in both mobile and static scenarios.

关键词： Peer to peer computing Routing Relays Algorithm design and analysis Mobile communication Routing protocols Monitoring

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A novel shape based batching and prediction approach for sunspot data using HMMs and ANNs

A novel shape based batching and prediction approach for sun...

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India International Conference on Power Electronics (IICPE)

作者： Saurabh Bhardwaj Smriti Srivastava J. R. P Gupta Advait Madhvan Department of Instrument of Control Engineering Netaji Subhas Institute of Technology New Delhi India Electrical and Computer Engineering Department University of California Santa Barbara USA

This paper introduces a novel approach which uses a Hidden Markov Model (HMM) based Artificial Neural Networks (ANN) for prediction of systems that are non deterministic, dynamical and chaotic in nature. The HMM is used for shape based batch creation of training data, which is then processed one batch at a time by an ANN. The weights and Learning Rate of the ANN are tweaked to predict the correct output for an input dataset. The novel Prediction method used here exploits the Pattern Identification prowess of the HMM for batch selection and the ANNs of each batch to predict the output of the system. The Standard application of the Sun-Spot Data (SSD) was used for testing the competence of this method.

关键词： Hidden Markov models Shape Artificial neural networks Time series analysis Markov processes Training Prediction algorithms

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SVM Based Scheme for Predicting Number of Zombies in a DDoS Attack

SVM Based Scheme for Predicting Number of Zombies in a DDoS ...

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European Intelligence and Security Informatics Conference (EISIC)

作者： P.K. Agrawal B.B. Gupta Satbir Jain Department of computer Engineering Netaji Subhas Institute of Technology Delhi University New Delhi India Department of Computer Science Graphic Era University Dehradun India

In recent time, Internet or network services has gain popularity due to rapid growth in information and telecommunication technologies. Internet or network services become the mean for finance management, education, and global information service center for news, advertisements and many others. Denial of service attack and most particularly the distributed denial of service attack (DDoS) is most common and harmful threat to the Internet or network services. In order to design and develop reliable and secure network services, rapid detection and quick response to these attacks are major concern. In practice, there is no scheme that completely detects or prevents the DDoS attack. Predicting number of zombies in a DDoS attack is helpful to suppress the effect of DDoS attack by filtering and rate limiting the most suspicious attack sources or improve DDoS response system. In this paper, we present machine learning approach based on support vector machine for regression to predict the number of zombies in a DDoS attack. MATLAB implementation of support vector machine for regression and datasets generated using NS-2 network simulators running on Linux platform are used for training and testing. SVM for regression with various kernel function and other parameters are compared for their prediction performance using mean square error (MSE). Results show SVM based scheme have promising prediction performance for small dataset.

关键词： Support vector machines computer crime Kernel Polynomials Testing Training Training data

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Synthesis of New Single CFOA-Based VCOs Incorporating the Voltage Summing Property of Analog Multipliers

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International Scholarly Research Notices 2012年第1期2012卷

作者： S. S. Gupta D. R. Bhaskar R. Senani Department of Industrial Policy and Promotion Ministry of Commerce and Industry Government of India Udyog Bhawan New Delhi 110011 India Department of Electronics and Communication Engineering Faculty of Engineering and Technology Jamia Millia Islamia New Delhi 110025 Indiajmi.nic.in Division of Electronics and Communication Engineering Netaji Subhas Institute of Technology Sector 3 Dwarka New Delhi 110078 Indiansit.ac.in

Recently, current feedback operational amplifier (CFOA) and analog multiplier-(AM-) based-voltage controlled oscillators (VCOs) have been published in the literature which require 2 CFOAs and 2 AMs for linear tuning law between control voltage and frequency of oscillation. In this paper, a family of eight new voltage-controlled oscillators (VCOs), with linear tuning laws, employing only a single CFOA in conjunction with two analog multipliers (AMs), has been derived through a systematic state-variable methodology. This has been made possible by exploiting the voltage summing property of the multiplier chosen which has never been done in the literature earlier. The workability of the presented VCOs has been verified by experimental results based on AD844 type CFOAs and AD534 type AMs, and the advantages of new circuits over the previously known CFOA-AM-based VCOs have been highlighted.

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Message Security in Multi-Path Ad Hoc Networks Using a Neural Network-Based Cipher

Message Security in Multi-Path Ad Hoc Networks Using a Neura...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Che-Yu Liu Isaac Woungang Han-Chieh Chao Sanjay K. Dhurandher Ting-Yun Chi Mohammad S. Obaidat Institute of Computer Science & Information Engineering National I-lan University Taiwan Department of Computer Science Ryerson University Toronto ONT Canada Division of Information Technology Netaji Subhas Institute of Technology University of Delhi India Department of Computer Science and Software Engineering Monmouth University West Long Branch NJ USA

Securing the transfer of data in mobile ad hoc networks (MANETs) is still a challenging issue. This paper proposes a method for providing message security in MANETs when nodes cooperate in routing. Our approach combines a trust-based multipath routing scheme and a real-time recurrent neural network-based (RRNN) cipher (yielding our so-called TR-RRNN scheme) to deal with the issues underlying message confidentiality, integrity, and access control. Simulation experiments using QualNet were conducted, showing that the proposed scheme is much more secured compared to the traditional multi-path routing algorithms and a recently proposed message security scheme for MANETs (our so- called Original Trust-based Multi-path Routing scheme (OTMR)). The route selection time and trust compromise are used as the performance criteria.

关键词： Peer to peer computing Routing Ad hoc networks Mobile computing Routing protocols Encryption

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