Catálogo de publicaciones - libros

Various intelligence styles ITS systems are developed by wireless network and development of GPS (Global Positioning System). Vehicles position track system that grasps position of vehicles by real time at control and monitoring center is a core of public transportation information system and it supplies various information that are related to the vehicles position information to user and administrator. Most existing Vehicle location tracking systems use a GPS system that is a high cost device then other things. Therefore, we designed vehicle location track system that using sensor node in which node has an inexpensive and miniaturized RF transceiver. Proposed vehicles position track system collects message that wireless ad-hoc network that is consisted of fixing sensor node that is installed along bus route and mobile sensor node that is installed to bus are happened contacting in server and manage transfer information of vehicles. Also, take advantage of bidirectional of wireless ad-hoc network it can supply bus surrounding information connected with bus position information to passenger.

Korean script Hunminjeongeum (correct sounds to teach the people), called Hangul, that was distributed in 1446 can generate 39.9 billion syllabic characters by 28 basic alphabets and 5 rules. Current Hangul on computer lost scientific properties and then cannot generate all of 39.9 billion syllables because choosing syllable as a target among encoding objects of syllable, syllabic primitive, and alphabet. In this paper, we propose a coding scheme and a method of generating fonts so as to represent all syllabic characters defined in Hunminjeongeum.

What is most important issue in web services using Multimedia Content is acceleration technique for efficient distribution of the multimedia content. 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. Thus, studies on the acceleration of the acceleration of the multimedia content are directly linked with the improvement of a web system. An improvement in the system performance can be achieved using a type of load uniformity (hereinafter called load balancing) by producing a cluster system using several server systems from a web service provider’s point of view. 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 provider’s point of view.

A web caching technology is one of the major factors, which affects the performance of a web system. The existing studies related to web caching technology have been focused on an increase in object-hit ratio and a decrease in caching costs. However, a web caching technology, which analyzes and reflects the reference characteristics of the web object, is required to effectively operate a web system, because the reference characteristics of web object becomes a major factor in decreasing the performance of a web system. In this paper, we analyze the reference characteristics of web object.

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.

When building some kinds of IT systems, security-related requirements must be considered. It is essential that not only the customer’s requirements for software or systems functionality should be satisfied but also the security requirements imposed on the software or systems development should be effectively analyzed and implemented in contributing to the security objectives of customer’s requirements. Though the customer’s requirements must be implemented to software or systems perfectly, but these are not sufficient. The secure software or systems may be implemented by not only applying security products but also considering security requirement appended to customer’s requirement. In this paper, we propose a security engineering based approach considering security when developing software or systems based on System Block Model.

In this paper, the performance of a wireless communication system based on the TD-CDMA transmission technique is analyzed. In this paper, we present simulation results for the performance of a turbo coded TD-CDMA system with QPSK over Rayleigh fading channel model. And the system performance employing the simple averaging channel estimation is compared to the ideal case with the perfect channel estimation.

Ever since man invented writing he has used text to store and distribute his thoughts. With the advent of computers and the Internet the delivery of these messages has become almost instant. Textual conversations can now be had regardless of location or distance.

Advances in computational power for 3D graphics are enabling Virtual Environments(VE) within which users can become increasingly more immersed. By opening these environments to other users such as initially through sharing these text conversations channels, we aim to extend the immersed experience into an online virtual community.

This paper examines work that brings textual communications into the VE, enabling interaction between the real and virtual worlds.

In the recent years a growing interest in Collaborative Virtual Environments (CVE) can be observed. Most of these systems use event-object driven architectures for consistent and clear communication inside these systems and in between them. Networked Virtual Reality (VR) applications make heavy use of position tracking data and process a vast amount of transformation matrices during their simulation steps. This observation leads to a novel approach on how communication in Networked Virtual Environments (NVEs) could take place by considering events as well as transformation data to allow for higher responsiveness within Virtual Worlds.

Most graphics used in web pages are very attractive for the eye and useful for a lot of people. However, with the extensive use of pixel graphics such as charts without additional textual description or image maps, handicapped users of web pages are encountering an ever increasing amount of barriers. Therefore, it is essential that future development on web content focuses on accommodating all kinds of disabilities. The use of Scalable Vector Graphics (SVG) provides new possibilities as well as new challenges for the accessibility of web sites. Consequently, the implementation is embedded in a peer-to-peer (P2P) network with reusable SVG patterns for enhanced barrier-free web applications. The aim of the new architecture is to support graphic designers and web developers in making graphics accessible for as many user groups as possible.