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In this article we present best practices in implementing a geographic information system that may be used as a foundation for commercial geographic web services. On one hand we explain important rules to be followed during the design of the information system itself, e.g. the data supply process. On the other hand we introduce different categories for potential geographic web services and analyze...
This paper aims to propose a route navigation method for disabled access GIS. We focused the disabled’s psychologies as well as their physical conditions. This paper represents quantization of physical and psychological burden of the disabled persons inflicted by various barrier factors. Also it represents estimation of total burden of a route to determine the optimum route. The route is represented...
As the introduction of SAN progresses for the purpose of the storage management cost reduction, iSCSI is expected as a representative of IP-SAN that uses IP network. However, SAN is mostly used only in the server site currently. Thus we have claimed iSCSI can be employed in a WAN environment using VPN, as well as in a local environment. In this paper, the behavior of the TCP Congestion Window is observed...
We consider the problem of data durability in low-bandwidth large-scale distributed storage systems. Given the limited bandwidth between replicas, these systems suffer from long repair times after a hard disk crash, making them vulnerable to data loss when several replicas fail within a short period of time. Recent work has suggested that the probability of data loss can be predicted by modeling the...
We have previously proposed Autonomous Disks System as a dependable and high-performance networked parallel storage system. The system has function of load balancing by online horizontal data migration. However, the migration causes a reduction of system availability by insensitively utilizing of system resources for massive data transfers. Thus we have also proposed Replica-assisted Migration, which...
The secure storage systems adopting the encrypt-on-disk scheme, in which files are stored in cipher for efficient data transmission, need to re-encrypt files with new cryptographic keys when a revocation occurs. There are two re-encryption methods, namely active revocation in which the re-encryption is immediately performed and lazy revocation in which the re-encryption is delayed until the file is...
In this paper, we propose an effective method for segmenting large XML documents into independent meaningful subtrees based on two syntactic segmentation rates: vertical segmentation rate and horizontal segmentation rate. In the proposed method, we use DO-VLEI code to calculate the required parameters for the subtree segmentation. We conduct experiments to observe the effectiveness of the proposed...
We propose an XML storage scheme based on Document Table Model (DTM) which expresses an XML document as a table form. When performing query processing on large scale XML data, XML storage schemes on secondary storage and their access methods greatly affect the entire performance. For this reason, we developed an XQuery processing scheme in which an XML document is internally represented as a set of...
Since its advent, the Extensible Markup Language (XML) has gained tremendous popularity in many different application areas. However, XML data is generally very verbose and redundant, and thus it requires a lot of disk space to store and bandwidth to transfer. To overcome this problem, many methods for compressing XML documents have been proposed. In general, data compression requires a model which...
In recent years, the method of assigning labels to the nodes of an XML tree is getting more attraction. Various functions in an RDBMS can be easily utilized by storing the labeled XML documents into the RDB. However, in traditional labeling methods, a number of nodes need to be relabeled, when the XML documents are updated. To address this problem, we proposed DO-VLEI code combining VLEI code with...
The development of IP-SAN is expected to be scalable and cost-effective SAN, and iSCSI is also the expected data transfer protocol of IP-SAN. In this paper, we have provided a detailed analysis of iSCSI storage accesses with short blocks. First, we show turn-around times of short block iSCSI storage accesses with several iSCSI implementations. We found that the differences among the implementations...
Recently, it is needed to have high performance and use capacity efficiently at the same time on the heterogeneous disk environment. But it is difficult to do so because the performance and capacity of each disk are different. We think to extend AOD method for this aim. This method uses the difference of access load between primary data and backup data and balance access load and data amount simultaneously...
In this paper, we address the problems of the existing log-based flash memory file systems analytically and propose an efficient log-based file system, which produces higher performance, less memory usage and mount time than the existing log-based file systems. Our ideas are applied to a well-known log-based flash memory file system (YAFFS2) and the performance tests are conducted by comparing our...
Health care providing concerns a lot of individuals - patients, nurses, doctors, secretaries, managers, etc.- located in different places and belonging to multiple organizations. Collaborative work of these professionals is usually organized through process guidelines, while recommendations are given by each organization and each specialty in order to ensure quality of patients care. Difficulties...
With the considerable increase of data and the diversity of the user’s needs, the personalisation of information becomes a real challenge in medical information systems. In this context, we propose a technique to personalise medical information, based on a profile modeling. This technique consists in: 1) building user’s profile and 2) using these profiles in the medical information adaptation. The...
The hospital activities display all of the characteristics of a very complex sociotechnic organisation. Consequently, the design of Computerized Physician Order Entry (CPOE) softwares which support this type of activity is very difficult. The Study of the procedure of these projects shows communication information problems between project partners. This article proposes the principles of an approach,...
Variability is defined as the ability of a software artefact to be changed or customised to be used in multiple contexts. This paper outlines variability issues through reusable component development, and in particular, in Business Component (BC) development. The main ideas of this work are (a) to address variability issues through BC development, (b) to explain variability principles in order to...
Nosocomial infections constitute a serious problem for public health. They develop by various ways, and their detection, at early stages, is not always easy. Furthermore, their follow-up requires the collaboration of several partners, which is very complex and sometimes inefficient. The objective is to produce collaborative platform of diagnosis and follow-up of the disease in order to bring a real-time...
Semantic Web technologies in general and ontologybased approaches in particular are considered the foundation for the next generation of information services. While ontologies enable software agents to exchange knowledge and information in a standardised, intelligent manner, describing todays vast amount of information in terms of ontological knowledge and to track the evolution of such ontologies...
The paper describes a new approach for treating trust in reconfigurable groups of users with special accent on trust in the next generations of the Internet. The proposed model uses properties of weighted hypergraphs. Model flexibility enables description of relations between nodes such that these relations are preserved under frequent changes. The ideas can be straightforwardly generalized to other...
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