Yun Ji Na

ACASH: an adaptive web caching method based on the heterogeneity of web object and reference characteristics

The use of cache to store and process web objects has increased, and studies on effective web caching have been actively conducted. A processing unit of web caching contains web objects, and changes in the heterogeneity of these web objects and their reference characteristics become a major factor of decreased performance in the existing method. This study proposes ACASH, a new web caching method. ACASH manages a cache scope by dividing it based on the heterogeneity of web objects. Also, it adaptively reflects changes in the reference characteristics of the object according to the time elapsed. In addition, it is shown in an experimental model, which captures the heterogeneity of the object that the proposed method performs better than the existing method.

An adaptive web caching method based on the heterogeneity of web object

Heterogeneity of Web objects is the important causes of the decrease the performance of web caching algorithms. To increase the throughput of web caching process and to improve service availability, we may consider heterogeneity of web object adaptively. In this study, we proposed the new web-caching algorithm. A heterogeneity variation of an object can be reduced as the proposed method dividedly managing. Web objects and a cache scope with heterogeneity, and it is adaptively reflecting a variation of object reference characteristics with the flowing of time. In the experiments, we verified that the performance of the proposed method was more improved than existing algorithms through the two experiment models, which considered heterogeneity of an object.

Distribution of digital contents based on public key considering execution speed and security

Information security is becoming a more important factor in distribution of digital contents. Generally, illegal facsimile of high-quality multimedia products such as DVDs, MP3s and AACs is possible without damaging quality. Thus, the illegal distribution of duplicated contents on the Web is causing digital content providers great economic loss. Therefore, a study of security and efficient distribution of digital contents is required. The most important issues in the design of a digital content distribution system are user convenience, execution speed and security. In this study, we designed a digital contents distribution system that uses web caching technology and encryption/ decryption techniques in hierarchical structures. We propose a digital content distribution system that improves user convenience, security and execution speed. The superior performance of the proposed system has been proven in the tests. The results of experiment show that the developed system has improved the security of DC without decreasing process speed.

Design and performance analysis of the web caching algorithm for performance improvement of the response speed

Until now, various web caching replacement algorithms related to this were researched. An aggravation of web object heterogeneity more frequently generates a replacement of a web object, but cannot reflect enough all kinds of characteristics of web object in these traditional replacement techniques. Especially size heterogeneity of an object has an influence on performance of a web caching seriously. Therefore, a study on web caching algorithm with size heterogeneity of an object is required. In this study, we proposed a web object replacement algorithm with heterogeneity of a web object for performance improvement of the response speed. The algorithm is designed with a divided scope that considered size reference characteristic and reduced size heterogeneity on web object. The performance of the algorithm is analyzed with an experiment. With the experiments results, the algorithm is compared with previous replacement algorithms, and its performance is confirmed with 10%-20% elevation of object-hit ratio and an improvement of response speed.

A multilayered digital content distribution using a group-key based on web

Web based distribution of multimedia digital content has been accelerated due to the increase in the use of the Internet. The major issue regarding the design of a multimedia digital content distribution system through the web is to guarantee the security of digital content and to supply a large amount of high quality multimedia digital content to users. This study focused on designing a security technique for each group in a multilayered structure, and on a caching technique, which is based on this security technique, and to improve the users response speed. Using these techniques guarantees the security of digital content distribution. We implemented the prototype and verified the performance of the proposed system through testing.

A Design of the Simulator for Web-Based Load Balancing

Web services are based on a web-based system in which the performance of this system becomes a major factor in determining the quality of services.An improvement in the system performance can be achieved using a typeof load uniformity (hereinafter called load balancing) by producing a cluster system using several server systems from a web service providers point of view. In addition, certain frequently used web objects or objects that will be frequently applied during web caching from a web service users point of view are to be closely related to a nearby web server in clients. This study investigates a method that improves the acceleration performance in a web-based service. A method that distributes loads applied to a web system itself using a dynamic load balancing method, which uses various types of information between nearby servers, was investigated from a web service providers point of view.

A digital content distribution using a group-key and multi-layered structure based on web

Regarding the design of a multimedia digital content distribution system, the important issues are to supply a large amount of multimedia digital content to users and to guarantee the security of digital content. In this study we proposed designing a security technique for each group in a multilayered structure, and on a caching technique, which is based on this security technique, and to improve the user’s response speed. Using these techniques guarantees the security of digital content distribution.

A design of hybrid mobile multimedia game content

This paper proposes a hybrid mobile multimedia game content using a hybrid method. The proposed method can share linked materials in real-time between these methods and presents an effective solution for various limitations caused by the memory capacity of mobile terminals in the planning and production processes of Multi media game content. In addition, this method presents a real performance by applying it to the production of an actual mobile multimedia game.

A study on a design of efficient electronic commerce system

In this study, an e-commerce system with the capability of web cache based on the split area in a hierarchical structure is designed. The performance is then assessed through experiment. The local server for the proposed system is a duplicated server for the e-commerce system. The advantage of location improves the latency time. The systems response speed is also improved due to dispersion of the entire systems load. The performances of the system and algorithm are analyzed with an experiment. With these experiment results, the algorithm is compared with previous replacement algorithms.

A design of the flexible mobile agents based on web

The key features of mobile agent systems are mobility, autonomy, and intelligence. On integrity protection within mobile agent technology, mobile agent integrity should be protected against attacks from malicious hosts and other agents. In this paper, we design flexible Mobile Agents (FMA). The traditional mobile agents consist of fixed code parts. But FMA consist of flexibly upgradeable agent code part for that new agent code modules can be added and redundant code modules can be deleted on the executing requirement. FMA prove to be more flexible in agent-based web systems compared to the traditional static-type mobile agent.