Catálogo de publicaciones - libros

Digital home services have been provided separately by each service provider who has a closed service delivery infrastructure for delivering home services. Because of this, 3rd party service providers who do not have the infrastructure to deploy home services have difficulties in participating in the home network market. Also, it is difficult for 3rd party service providers to provide a control-device-specific graphic user interface to service users due to the limitation of home gateway resources. In order to solve these problems, we propose a digital home service delivery and management system for small business companies that need to provide various home services to users. Also, this system supports functions for providing a user friendly graphic user interfaces dedicated to mobile device. By using the proposed system, the service aggregator can lead the competition of 3rd party service providers in the home network service market, and help it grow rapidly.

Most of Voice over IP(VoIP) systems are deployed using SIP protocol and based in a client-server architecture. A lot of people and companies could be benefited if the system did not require the configuration and maintenance of central servers. Some proposals are found in the literature. In order to improve the efficiency of such approaches and to provide a complete self-configuring service of IP telephony, we suggest a new solution based on the P2P algorithm Kademlia. According with the results of our experiments, our approach has a better performance when network experiences different kind of delays due to the fact that Kademlia supports concurrent searches, improving the latency in user location, and providing a faster call establishment.

In the area of electronic commerce, the personalized goods recommendation system is a very important research issue that raises user satisfaction, and increases loyalty towards the content provider. For this, the correct analysis of user preferences is essential, and most existing researches use a purchase history or a wish list. However, due to the rapid development of information technologies, commerce has progressed from e-commerce to . In the ubiquitous environment, computing devices of various types, including the mobile device itself, exist in user space; in addition, a broad range of information related to user preferences is generated while using these devices. Hence, if the information is efficiently managed, a more effective recommendation strategy will be established. This paper proposes a multi-agent based U-commerce system to efficiently collect and manage diverse context information that can occur in the ubiquitous environment. Therefore, a more personalized recommendation, which is reflected by various user preferences, is possible. A prototype was implemented in order to evaluate the proposed system, then, through results, the existing recommendation method is compared and the effectiveness of the system is confirmed.

In recent years, the number of messages transferred through networks has skyrocketed with the rising number of network nodes. For example, servers collect variant sensor information and store it. Although related works exist that present cache servers intended to reduce network costs, those cache functions do not work well for short lifetime content because most cached contents with short lifetimes are expired before referral. In this paper, we propose a method to resolve the problem for the coming ubiquitous network society, which is an asynchronous cache management method according to the application requirement. This method enables the CPU load of the servers to be reduced through service and application management for short-lifetime content, too. Furthermore, we propose a load-balancing method using autonomous message exchange instead of a management system. This method enables the CPU load to be balanced over multiple servers.

Windows and Unix systems have been traditionally very different with regard to configuration storage and management. In this paper we have adapted our CIM-based model-driven management framework, AdCIM, to extract, integrate and modify management and configuration information from both types of OS in a multiplatform and seamless way. We have achieved very low latencies and client footprints without sacrificing the model-driven approach. To enable this functionality for a wide range of system administration applications, we have implemented both an efficient CIM XML dialect and a distributed object infrastructure, and we have assessed its performance using two different approaches: CORBA and Web Services.

The mobile devices have gained much functionality and intelligence with the growth of network technologies, the abundance of network resources, and the increase of various services. At the same time they are also becoming complicated and related problems to services and resources of mobile devices frequently occur. Since it is not easy for the manufacturers to completely remove the software errors of the mobile devices before they sell them, the users face inconvenience caused by them and the credibility of the manufacturers also decreases. So far, no definitive method has been given to debug software errors of the sold mobile devices. In this paper, we propose a debugging method to find and correct the software errors of the sold mobile devices based on the Open Mobile Alliance (OMA) Device Management (DM) standard. We define the managed objects (MOs) for composing the execution image and design the management operations for collecting MOs at the central server. We present a system that we have developed based on the MOs and the management operations. We also present how to debug software errors with the execution image and JTAG debugger.

We propose a new technique that realizes flexible process control by combining “the planning paradigm” and “the constraint satisfaction paradigm.” Two factors should be kept consistent in business processes: business objects and activity sequences. We adopted the planning paradigm to control the sequence of processes and the constraint satisfaction paradigm to keep the objects consistent. We then developed a new process control technique that allows operation support systems to suggest executable activities and consistent values to users dynamically. We implemented a prototype system and confirmed its feasibility.

On the process of converting existing IT service management structure into ITIL based ITSM structure, many of operation management systems that introduced the guideline of ITIL are able to confront several side effects at operation of fault management process. The typical instances of the side effects are business disorder caused by refinement of fault management process, accuracy decrease of RCA (Root cause analysis) caused by reliability shortage of KEDB information, and delay of fault recovery time caused by the collaboration work to handle a fault between management steps, etc. In this paper, we proposed several mechanisms for KEDB-centric fault management in order to minimize the side effects of fault management process of the ITIL based ITSM. The main objects of proposed fault management mechanisms are to support effective collaboration system for handling a fault between management steps, to provide essential information for analyzing faults, and to provide accurate fault recovery path for prompt handling of various types of faults. The proposed mechanisms were applied to an implementation of Internet service resource management system in KT. As the result, the proposed mechanisms contributed to achieve business goals that are expected by introduction of ITIL based ITSM paradigm, such as TCO reduction through effective resource management and systematic management of service quality based on SLA with customer.

Operating a next generation network (NGN) while new services and network elements (NE) are being intermittently introduced is a complex and difficult task. We are trying to establish flexible network operation technology. This article introduces a method of automatically generating NE-adapters in element/network management systems (EMS/NMS) to interact with NEs. This method alleviates the effort of NE configuration tasks by automating the development of functions that operators use to set up NEs. We call this interface blending/diagnosis method. Our approach consists of 1) a blending method that automatically generates NE-adapters for products from different vendors from commands and responses between an EMS and an NE and 2) a diagnosis method that verifies blended adapters with actual NEs. Moreover, this article introduces a configuration support tool that we developed. The tool complements the interface blending/diagnosis method even if there is no adapter to be possible to use as knowledge.

In this paper, we propose a new approach to auto configure a power line communication modem and a coaxial cable modem with minimum user intervention. The proposed approach is based on the following strategies: (1) An ISP establishes servers, (2) An ISP operator inputs information to configure modems to the server before configuration and (3) The software for the zero configuration of modems is built into a residential gateway. We implement a system based on the proposed approach, and measure the configuration time. The result shows that the configuration time is about 280 seconds. The system allows us to zero configure modems with minimum user intervention and moreover, the configuration time is faster than manual settings.