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A time series data management framework

A time series data management framework

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international conference on information technology: coding and computing (itcc)

作者： A. Matus-Castillejos R. Jentzsch School of Information Sciences & Engineering University of Canberra Canberra ACT Australia

In the real world there are thousands of time series data that coexists with other data. Every day tons of data is collected in the form of time series. Time series is a collection of observations that is recorded or measured over time on a regular or irregular basis generally sequentially. Time series arise in financial, economic, and scientific applications. Typical examples are the recording of different values of stock prices, bank transactions, consumer price index, electricity and telecommunication data, etc. In theory, such data is processed, analyzed, disseminated, and presented. However, many institutions are facing some difficult issues in organizing such a vast amount of data. Therefore, the need for data management tools has become more and more important. This paper addresses this issue by proposing a framework for Time Series Data Management (TSDM). The central abstraction for the proposed domain specific framework is the notion of Business Sections, Group of Time Series, and Time Series itself. The framework integrates minimum specification regarding structural and functional aspects for time series data management.

关键词： Database systems Relational databases Economic forecasting Object oriented modeling Object oriented databases Industrial relations Data engineering Australia Time measurement Energy consumption

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Mining biomedical images with density-based clustering

Mining biomedical images with density-based clustering

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international conference on information technology: coding and computing (itcc)

作者： M.E. Celebi Y.A. Aslandogan P.R. Bergstresser Department of Computer Science & Engineering University of Technology Arlington TX USA Department of Dermatology University of Texas Southwestern Medical Centre Dallas TX USA

Density-based clustering algorithms have recently gained popularity in the data mining field due to their ability to discover arbitrary shaped clusters while preserving spatial proximity of data points. In this work we adapt a density-based clustering algorithm, DBSCAN, to a new problem domain: identification of homogenous color regions in biomedical images. Examples of specific problems of this nature include landscape segmentation of satellite imagery, object detection and, in our case, identification of significant color regions in images of skin lesions (tumors). Automated outer and inner boundary segmentation is a key step in segmentation of structures such as skin lesions, tumors of breast, bone, and brain. This step is important because the accuracy of the subsequent steps (extraction of various features, post-processing) crucially depends on the accuracy of this very first step. In this paper, we present an unsupervised approach to segmentation of pigmented skin lesion images based on DBSCAN clustering algorithm. The color regions identified by the algorithm are compared to those identified by the human subjects and the Kappa coefficient, a statistical indicator of computer-human agreement, is found to be significant.

关键词： Biomedical imaging Clustering algorithms Image segmentation Lesions Skin neoplasms Breast neoplasms Data mining Satellites Object detection Bones

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CompChall: addressing password guessing attacks

CompChall: addressing password guessing attacks

引用

international conference on information technology: coding and computing (itcc)

作者： V. Goyal V. Kumar M. Singh A. Abraham S. Sanyal OSP Global Mumbai India Crypto Group Institute of Technology Banaras Hindu University India School of Computer Science and Engineering Chung Ang University South Korea School of Technology & Computer Science Tata Institute of Fundamental Research India

Even though passwords are the most convenient means of authentication, they bring along themselves the threat of dictionary attacks. Dictionary attacks may be of two kinds: online and offline. While offline dictionary attacks are possible only if the adversary is able to collect data for a successful protocol execution by eavesdropping on the communication channel and can be successfully countered using public key cryptography, online dictionary attacks can be performed by anyone and there is no satisfactory solution to counter them. This paper presents a new authentication protocol which is called CompChall (computational challenge). The proposed protocol uses only one way hash functions as the building blocks and attempts to eliminate online dictionary attacks by implementing a challenge-response system. This challenge-response system is designed in a fashion that it does not pose any difficulty to a genuine user but is time consuming and computationally intensive for an adversary trying to launch a large number of login requests per unit time as in the case of an online dictionary attack. The protocol is stateless and thus less vulnerable to DoS (Denial of Service) attacks.

关键词： Dictionaries Cryptographic protocols Authentication Public key cryptography Computer science Communication channels Counting circuits Computer crime Humans Testing

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StackOFFence: a technique for defending against buffer overflow attacks

StackOFFence: a technique for defending against buffer overf...

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international conference on information technology: coding and computing (itcc)

作者： B.B. Madan S. Phoha K.S. Trivedi IST Division ARL Pennsylvania State University PA USA Information Technology Laboratory National Institute for Standards and Technology Gaithersburg MD USA Pratt School of Engn. EC&E Department Duke University Durham NC USA

Software coding practices, in the interest of efficiency, often ignore to enforce strict bound checking on buffers, arrays and pointers. This results in software code that is more vulnerable to security intrusions exploiting buffer overflow vulnerabilities. Unfortunately, such attacks form the most common type of security threats to the computer and information systems, making it imperative to find efficient solutions for the buffer overflow vulnerabilities. Typically, an attacker is able to affect a successful intrusion by causing buffer overflow in the stack frame of a function call, thereby causing the valid return address to get overwritten by a malicious value. This allows the attacker to redirect the return from a function call to a malicious piece of code introduced by the attacker. Depending on the nature of the malicious code, the attacker is able to compromise availability, integrity, or confidentiality of a system. Researchers have suggested transforming the return address or even using an entirely separate stack for managing the return addresses. This paper describes a simple technique that ensures the integrity of the return address by pushing on the stack two copies of the return address, a transformed (or encrypted) return address value along with the original one. Before popping the return address, two return address values are compared to detect any malicious activity, thus preventing the exploitation of the stack based buffer overflow vulnerabilities. The proposed modification may be implemented at the CPU architecture level or by simple modification to the compiler's prologue and epilogue code.

关键词： Buffer overflow Internet information security information systems Algorithms Educational institutions NIST Computer security Cryptography Surveillance

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Resisting flooding attacks in ad hoc networks

Resisting flooding attacks in ad hoc networks

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international conference on information technology: coding and computing (itcc)

作者： Ping Yi Zhoulin Dai Yiping Zhong Shiyong Zhang Department of Computing and Information Technology Fudan University Shanghai China

ISBN: (纸本)0769523153

Mobile ad hoc networks will often be deployed in environments where the nodes of the networks are unattended and have little or no physical protection against tampering. The nodes of mobile ad hoc networks are thus susceptible to compromise. The networks are particularly vulnerable to denial of service (DOS) attacks launched through compromised nodes or intruders. In this paper, we present a new DOS attack and its defense in ad hoc networks. The new DOS attack, called ad hoc flooding attack, can result in denial of service when used against on-demand routing protocols for mobile ad hoc networks, such as AODV, DSR. The intruder broadcasts mass Route Request packets or sends a lot of attacking DATA packets to exhaust the communication bandwidth and node resource so that the valid communication can not be kept. After analyzed ad hoc flooding attack, we develop flooding attack prevention (FAP), a generic defense against the ad hoc flooding attack in mobile ad hoc networks. The FAP is composed of neighbor suppression and path cutoff. When the intruder broadcasts exceeding packets of route request, the immediate neighbors of the intruder observe a high rate of route request and then they lower the corresponding priority according to the rate of incoming queries. Moreover, not serviced low priority queries are eventually discarded. When the intruder sends many attacking DATA packets to the victim node, the node may cut off the path and does not set up a path with the intruder any more. Mobile ad hoc networks can prevent the ad hoc flooding attack by FAP with little overhead.

关键词： Intelligent networks Ad hoc networks Mobile ad hoc networks Computer crime Routing protocols Floods Financial advantage program Broadcasting information technology Mobile communication

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Customizing a geographical routing protocol for wireless sensor networks

Customizing a geographical routing protocol for wireless sen...

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international conference on information technology: coding and computing (itcc)

作者： J. Chen Y. Guan U. Pooch Department of Computer Science Texas A and M University College Station TX USA Department of Electrical & Computer Engineering Iowa State University Ames IA USA

Several problems are required to be fixed in order to apply geographical routing protocol greedy perimeter stateless routing (GPSR) in wireless sensor networks. First, GPSR is designed under the assumption of symmetric links (i.e., bidirectional reachability), which is not realistic for many practical sensor networks, since wireless links in sensor networks often are asymmetric. Second, in sensor networks, packet destinations are often marked with locations instead of identifiers like IP address. Therefore, packets are routed to the home node, which is the node geographically closest to the destined location. Under GPSR, when the target location is outside the exterior perimeter of the sensor network, each packet has to visit all nodes on the boundary of the sensor network topology before it identifies the home node, which results in energy inefficiency. Third, due to the dynamic nature of sensor networks, maintaining data consistency, that is, data retrieved from the home node for a location should be consistent with the data sent to the same location, becomes a challenge when home nodes change. We propose on-demand GPSR (OD-GPSR), a data driven geographical routing protocol customized for sensor networks with solutions to the above three problems. Simulation results show that OD-GPSR performs well in terms of energy efficiency and packet delivery rate at the cost of a little bit more packet delivery delay.

关键词： Routing protocols Wireless sensor networks Computer science Network topology information retrieval Energy efficiency Computer networks Costs Delay Hardware

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A new region of interest image coding for narrowband network: Partial bitplane alternating shift 1

引用

IFIP international conference on Network and Parallel computing, NPC 2005

作者： Zhang, Li-Bao College of Information Science and Technology Beijing Normal University Beijing 100875 China

ISBN: (数字)9783540322467

ISBN: (纸本)354029810X

Regions Of Interest (ROI) image coding is one of the most significant features in JPEG2000. It allows ROIs of the image are of higher importance than background (BG). In this paper, a new and efficient scaling-based method so-called Partial Bitplane Alternating Shift (PBAShift) is described. The new algorithm firstly shifts up partial most significant bitplanes of ROI. Then, the most significant bitplanes of BG coefficients and general significant bitplanes of ROI coefficients are shifted up by bitplanes alternating scaling method. The least significant bitplanes of ROI and BG coefficients are obtained in the original position. The PBAShift method, in addition to supporting efficient single ROI coding, can flexibly code multiple ROIs with degrees of interest in an image. The experiments on remote sensing images show the presented method supports ROI coding of both arbitrary shape and arbitrary scaling without shape coding. Additionally, it can handle complexity multiple ROIs of arbitrary shapes efficiently. © IFIP international Federation for information Processing 2005.

关键词： Image coding

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Analysis, specification and generation of mobile computer data synchronisation 4

Analysis, specification and generation of mobile computer da...

引用

4th Annual international conference on Mobile Business, ICMB 2005

作者： Ye, Qingsong Sloane, Anthony M. Verity, Dominic R. Department of Computing Macquarie University SydneyNSW2109 Australia

ISBN: (纸本)0769523676

In current technologies, mobile computer data synchronisation protocols are typically programmed at a low-level. The disadvantages of this are that they are error-prone and time consuming. This paper analyses current Palm OS data synchronisation problems and applies embedded domain-specific language (EDSL) techniques in the problem domain to improve the current situation. The key advantage is that domain developers can describe problems using their natural terms and concepts at high conceptual level. Our approach allows equivalent code to be generated automatically from higher-level specifications, enabling domain developers to express their ideas quickly and concisely, to work more productively and to avoid certain kinds of coding error. © 2005 IEEE.

关键词： Specifications

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Implementation of a fast square in RSA encryption/decryption architecture

Implementation of a fast square in RSA encryption/decryption...

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2005 international conference on Security and Management, SAM'05

作者： Thapliyal, Himanshu Srinivas, M.B. Arabnia, Hamid R. Center for VLSI and Embedded System Technologies International Institute of Information Technology Hyderabad-500019 India University of Georgia Department of Computer Science 415 Graduate Studies Research Center Athens GA 30602-7404 United States

ISBN: (纸本)1932415823

This paper proposes the hardware implementation of RSA encryption algorithm using the recently proposed square architecture. It is an object of the present paper to provide a RSA encryption/ decryption circuit which can reduce circuit size by eliminating unnecessary logic in comparison to computing the square with a dedicated multiplier. The coding of the RSA is done in Verilog HDL and the FPGA synthesis is done using Xilinx libraries. The result shows that RSA hardware implemented using the proposed architecture is faster than RSA hardware implemented using traditional multiplication algorithm.

关键词： Computation theory

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Wavelet-based image compression using support vector machine learning and encoding techniques

Wavelet-based image compression using support vector machine...

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Eighth IASTED international conference on Computer Graphics and Imaging, CGIM 2005

作者： Ahmed, Rakib Gippsland School of Computing and Information Technology Monash University Gippsland Campus Australia

ISBN: (纸本)0889865140

This paper presents a method of compressing still images combining the powerful features of support vector machine (SVM) for machine learning with discrete wavelet transform (DWT) in image transformation. DWT, based on the 'haar' wavelet, has been used to transform the image and the coefficients acquired from DWT are then trained with SVM using Gaussian kernel. SVM has the property that it selects a minimal number of coefficients to model the training data for a predefined level of accuracy. The coefficients are then quantized and encoded using the Huffman coding algorithm. The performance of the proposed method is aspiring and comparable with the existing image compression standards.

关键词： Image compression

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