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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Internet Computing and Services
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Korean Society for Internet Information
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Volume & Issues
Volume 3, Issue 6 - Dec 2002
Volume 3, Issue 5 - Oct 2002
Volume 3, Issue 4 - Aug 2002
Volume 3, Issue 3 - Jun 2002
Volume 3, Issue 2 - Apr 2002
Volume 3, Issue 1 - Feb 2002
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Spatial Indexing Method for Efficient Retrieval of Levelized Geometric Data in Internet-GIS
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 1~13
Recently, Internet GIS(Geographic Information System) is increasing. From the results, more efficient spatial data retrieval is needed. For more efficient retrieval, a spatial indexing method is needed. This paper proposes an efficient spatial indexing method for levelized geometric data retrieval. Previous indexing methods are not adequate to retrieve levelized geometric data. For the effects, a few indexing methods for levelized geometric data, are known. But these methods support only a tew kinds of levelized geometric data. The proposed method supports all kind of levelized geometric data and outperforms to the previous method both in retrieval time and memory capacity.
A Modified Proportional Scheduler and Evaluation Method
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 15~26
Since multimedia data such as video and audio data are displayed within a certain time constraint, their computation and manipulation should be handled under limited condition. Traditional real-time scheduling algorithms could net be directly applicable, because they are not suitable for multimedia scheduling applications which support many clients at the same time. Rate Regulating Proportional Share Scheduling Algorithm is a scheduling algorithm considered the time constraint of the multimedia data. This scheduling algorithm uses a rate regulator which prevents tasks from receiving more resource than its share in a given period. But this algorithm loses fairness, and does not show graceful degradation of performance under overloaded situation, This paper proposes a new modified algorithm. namely Modified Proportional Share Scheduling Algorithm considering the characteristics of multimedia data such as its continuity and time dependency, Proposed scheduling algorithm shows graceful degradation of performance in overloaded situation and the reduction in the number of context switching, Furthermore, a new evaluation method is proposed which can evaluate the flexibility of scheduling algorithm.
Design and Implementation of Mobile IP for Handover Performance Improvement
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 27~37
This paper analyzes problems of existing Mobile IP and redesigns component functions, and proposes handover method using LRS and BCS for handover performance improvement. When mobile node moves another domain, the proposed BCS recognizes its mobility. So, BCS manages mobile node's binding information and serves micro mobility. When handover occurs among domains, micro mobility enables using LRS, As BCS and LRS have buffering function, they can reduce packet loss by forwarding the buffered datagram. It's designed component is implemented in LINUX environment. And then, handover performance was evaluated by simulation. The results of proposed handover method are better than existing method in both transmission delay time and packet loss.
A Database Schema Integration Method Using XML Schema
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 39~56
In distributed computing environments, there are many database applications that should share data each other such as data warehousing and data mining with autonomy on local databases. The first step to such applications is the integration of heterogeneous database schema, but there is no accepted common data model for the integration and also are difficulties on the construction of integration program. In this paper, we use the XML Schema for the representation of common data model and exploit XSLT for reducing the programming difficulties. We define the schema integration operations and develop a methodology for the semi-automatic schema integration according to schema conflicts types. Our integration method has benefits on standardization, extendibility on schema integration process comparing to existing methodologies.
A Physical Architecture of Management Network for High-speed Transferring of Management Information
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 57~67
The main goal of this paper is to establish the management network structure by adopting TMN concept. Hence, the management network structure consists in layers; from management application layer to lower physical layer In this paper, TMN-DCN structure is designed. That means, since the current communication network technology has developed so fast and new and more diverse communication networks have appeared, There is a need to process each management information in fast manner, The design method of management network physical structure that enhances the efficiency in network management with prompt transmission and reception of management information is proposed and the architecture is designed as well. Although there is some increase in installation fee for total link that constitutes the physical structure in lower physical layer. network management can be promptly implemented since the structure that can transfer the management information fastest is proposed.
Video Browsing Service Using An Efficient Scene Change Detection
Seong-Yoon Shin ; Yang-Won Rhee ;
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 69~77
Recently, Digital video is one of the important information media delivered on the Internet and playing an increasingly important role in multimedia. This paper proposes a Video Browsing Service(VBS) that provides both the video content retrieval and the video browsing by the real-time user interface on Web, For the scene segmentation and key frame extraction of video sequence, we proposes an efficient scene change detection method that combines the RGB color histogram with the
(Chi Square) histogram. Resulting key frames are linked by both physical and logical indexing, This system involves the video editing and retrieval function of a VCR's, Three elements that are the date, the field and the subject are used for video browsing. A Video Browsing Service is implemented with MySQL, PHP and JMF under Apache Web Server.
The Mechanism for Reliable Group Communication Based on CORBA in Distributed Environment
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 79~85
In open communication architecture, application systems consist of objects distributed in lots of computing nodes. To reduce complexity of development. and management of distributed software, to manage efficiently distributed objects and to provide realtime service, the mechanisms for object group management and communication are needed in distributed environment. In this paper we compose object groups and provide reliable group communication mechanism based on CORBA which can adopt a new service without lots of changes on existing system. Group consist of some subgroups that subgroup manager manages for improving the efficiency of group management and message ordering is kept by using sequencer, Communication method among groups uses multicast based on paint to point communication as well as IP multicast and we provide high performance by using selective retransmission of message through message history, We analyze the performance of the proposed mechanism through simulation in distributed environment.
Implementation of a Mobile Agent Platform for Handheld Devices to Access the SNMP MIB
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 87~95
Due to rapid development of high speed wire/wireless internet technologies, at the current age, it cares into being one phenomenon that the internet business is able to work on anyplace and anytime. In this environment, a technology of mobile agent provides very useful mechanism for personal handheld devices because of supporting migration as autonomously executable software object Instead of users. Therefore, this paper focuses on Implementing a mobile agent platform for personal handheld devices, which supports mobile agents in wire/wireless internet environment. To do this, we construct the system with modified JAMAS, based on Java, in our previous research. Based on our proposed system, we implement the browsing application in personal handheld devices to access the MIB(Management Information Base) on SNMP(Simple Network Management Protocol), which supervises network environment on wire/wireless internet. This proposed application system is easily to access the MIB managed by SNMP agent. then provides network map viewer and updates the MIB through the browser to network administrator. As a result, we can support application area of mobile agents such as hare network management. M-Commerce, integration of remote database systems, active message and active network with personal handheld devices.
Design and Implementation of an Education Information Search System for Children Using Information Gathering Agents
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 97~108
A user with a specific information need will often need to query several search engines before finding relevant documents. To address the problem of navigating the search engines, agents are used. In general, an agent is a program that can perform a particular task automatically, when appropriate or upon request by another program. In this paper, we design and implement the education information search system for children: using Information gathering agent that is called Edulnfo4k. The information gathering agent periodically visits several portal web sites for children: Ggureogi of Yahoo Korea, Junior of Naver and Gaegujaengi of Hanmir, collects the education or learning information for children, stores the collected information into database. Then, causal users can search the education information for children from database through a uniform user interface, conveniently. As the result, we know that Edulnfo4k provides integrated search without query in several search engines.
The Design and Development of Evaluation Tool for Software Usability
Journal of Internet Computing and Services, volume 3, issue 2, 2002, Pages 109~119
Usability is defined by the effectiveness efficiency and satisfaction with which specified users can achieve a specified goal in the particular environment. This paper is not only to provide a framework for specifying the usability attributes of a product and establishing a comprehensive set of usability criteria, but also to asses usability metrics of the software. The Evaluation Tool for Software Usability are developed based on the properties of the a user interface using ISO standard and general usability principles with product-oriented view. It means that product has attributes contributing to determine the usability. This paper also suggests the way to weight the relative importance of the individual usability item depending on the software categories.