43336842
Transfer, processing and distribution of cosmic ray data from Tibet
The YBJ-ARGO experiment uses cosmic ray data collected at the International Cosmic Ray Observatory in Tibet. Because of the observatory's location, transferring those data at a speed of 0.5 TB per day is challenging. Furthermore, the stream of raw data needs to be processed in a timely fashion before the resulting, reconstructed data are made available to the physicists-users. These processes demand large capacity, computing and storage resources. In this paper, we introduce the processes of transfer, processing and distribution of cosmic ray data from Tibet. A working demonstration was presented at the iGrid 2005 workshop.
13259771
Deploying HEP Applications on Multiple Grid Infrastructures
High energy physics (HEP) experiments are facing unprecedented challenges to deal with huge volumes of data. Grid is the excellent technology for it. However, Incompatibility of a variety of grid middewares is an obstacle to exploit the resources on multiple grid infrastructures. This paper firstly introduces HEP experiments and HEP grid, and then reviews the solutions for grid interoperability and interoperations. Because current HEP applications are tightly with gLite middleware, this paper highlights a gateway approach to interoperate with gLite and described it in detail. Direct access to gLite storage system is very important, and a dedicated tool for HEP data sharing is then proposed and implemented. Finally, the implementation of the interoperability of GOS and gLite is introduced.
6814190
Adapting to Application Workflow in Processing Data Integration Queries
Data integration has evolved to provide efficient data management across distributed and heterogeneous data sources in grid environment. However, existing works in data integration consider little knowledge about the above applications. In such settings, queries from the same application are processed independently. In this paper, application properties are noticed in order to improve query performance for data integration. We present a general-purpose and well-modular architecture for addressing data integration in grid (DIG) environment first, the modules of which can be flexibly deployed to adapt specific application. Moreover, special attention has been paid on query processing to accommodate application workflow with the component of query flow processor. It introduces multi-query optimization techniques to speed up overall response time for DIG.
15163337
A Database Encryption Scheme for Enhanced Security and Easy Sharing
Database encryption is a crucial technique in the security mechanisms of database. It is widely recognized as one of the key issues of data security. Current techniques of sharing the keys and the encrypted data for databases are neither convenient nor flexible in the real applications. Inspired by the PGP technique, we propose a novel database encryption scheme for enhanced data sharing inside a database, while preserving data privacy. It is characterized by both the fast speed of the conventional encryption and the convenience of key distribution of public key encryption. It also provides secured storage for security related data and effective key management, which enables the encrypted data to be shared conveniently. The scheme has been implemented and successfully applied on Oscar, a commercial DBMS developed by us
195918627
The Design and Realization of E-Journals' Categorizing and Navigating System.
This article gives a detailed description of how to design and realize a network full-text e-journalstategorizing and navigating retrieval system considering the characteristics of electronic resources and introducing specialty concept.
1262783
An Immunity-Based Intrusion Detection Solution for Database Systems
Database intrusion detection has been an important research area in database security. It focuses on malicious transaction attacks, which cannot be handled by traditional database security mechanisms, such as authorization, access control, integrity control, and so on. Although there have appeared some intrusion detection systems, current researches on malicious transaction detection are limited in accuracy and efficiency. Inspired by natural immune system, we propose a novel immunity-based intrusion detection solution for database system in this paper. It provides an additional layer of defense against DBMS misuse, especially malicious transactions. The ability to learn and to adapt to the environment dynamically entitles the system to detect both known and unknown malicious transaction intrusions efficiently. Simulations show that the database intrusion detection system based on data immunity can accelerate detection of malicious transaction attacks and improve its accuracy without causing any other performance penalty.
27043261
Accelerating XML Structural Matching Using Suffix Bitmaps
With the rapidly increasing popularity of XML as a data format, there is a large demand for efficient techniques in structural matching of XML data. We propose a novel filtering technique to speed up the structural matching of XML data, which is based on an auxiliary data structure called suffix bitmap. The suffix bitmap captures in a packed format the suffix tag name list of the nodes in an XML document. By comparing the respective suffix bitmaps, most of the unmatched subtrees of a document can be skipped efficiently in the course of structural matching process. Using the suffix bitmap filtering, we extend two state-of-the-art structural matching algorithms: namely the traversal matchingalgorithmand the structural join matching algorithm. The experimental results show that the extended algorithms considerably outperform the original ones.