Gil-Haeng Lee

Agent-based Web services middleware

Web services enable the integration of applications in a Web environment. Due to an increased automation of Web service interoperation, intelligent Web services are recommended, such as semantic Web services. In this paper, we first introduce Web services and the concept of intelligent Web services. We then propose an agent-based Web service middleware. We focus on the intelligent Web services platform with existing standards instead of proposing other standards. In particular, we present an agent approach to dynamic Web services, which invokes access points of UDDI registry automatically and returns execution results for Web services. The proposed approach is used to build experimental solutions involving intelligent Web service systems. Finally, we give an example to illustrate a typical scenario in which consumers search Web services using our Web services middleware.

A systematic software development process for non-functional requirements

As the importance of non-functional requirements has increased, many researchers have become interested in software development process for non-functional requirements including the notation, modeling, and assessment of non-functional requirements. However, the characteristics of non-functional requirements are so sophisticated that there have been many topics that should be defined more clearly. In order to address one of the challenging topics, we propose a systematic software development process to support the management of nonfunctional requirements. The process consists of six steps, each of which is composed of detailed activities. Using the proposed process, the non-functional requirements can be more effectively and systematically managed and modeled.

Network management system for wireless LAN service

The purpose of wireless LAN service is to provide mobile Internet environment for people who want to have wireless Internet using mobile devices. WLAN network consists of devices such as APs, routers, switches that are located in wide area, and they must be managed efficiently. So, wireless LAN network management system is developed, which is WLAN-NMS. It manages information of network elements and monitors the error status of each device on real-time. A WLAN-NMS that can manage a maximum of 50,000 network elements is designed and implemented and its operation and performance are shown.

Service Oriented Architecture for SLA Management System

SLA is a negotiated agreement between a customer and the service provider on levels of service characteristics and the associated set of metrics. The supplier organization may be an IT organization providing computing services to its customers. It is a explicit statement of the expectations and obligations that exist in a business relationship between two organization. Today, it is a major concern of business to guarantee the service level to the customer. In this paper, we present the framework of the SLM (SLA management system) to support the SLA, and define basic functions of the system.

Interactive panoramic VR system to expand spatialness and depth of 3D zone using see-through HMD glasses

In this paper, we propose a panoramic 3D display system to expand 3D spatialness and depth zone of 3D flat displays using see-through HMD glasses. For our purpose, we install circular passive filters in front of see-through glasses and also IR-LED markers for head tracking. Using these hardwares, we separately render a view region of each virtual camera with respect to 1:1 scale matching and divide its own 3D comfortable zone. Finally, we demonstrate expandable 3D virtual golf content with self-guidance.

A prediction-based adaptive location policy for distributed load balancing

Abstract The location policy in distributed load balancing is to locate the destination nodes to or from which tasks will be transferred. An efficient location policy is required to achieve high performance on distributed load balancing. In this paper, we propose a new distributed adaptive location policy based on predictable state knowledge . The predictable state knowledge in each node is composed of the system state information collected at run time and the predefined static information that is a priority order of each node for transferring tasks. The proposed scheme systematically maintains the preditable state knowledge in each node by using an efficient data structure and a rule for collecting state information with low overheads. When the state of a node becomes heavily-loaded, the proposed scheme predicts both heavily-loaded nodes and lightly-loaded nodes by exploiting predictable state knowledge and then finds a good lightly-loaded node that minimizes useless polling and maximizes even load distribution. An analytic model is developed to compare the presented scheme with other well known schemes. The validity of the model is checked with an event-driven simulation, and it is shown that the presented scheme exhibits a significant performance improvement over other schemes, especially at high system loads. Also, the presented scheme is shown to significantly improve polling hit ratio and to avoid system instability.

Dynamic markov random field model for visual tracking

We propose a new dynamic Markov random field (DMRF) model to track a heavily occluded object. The DMRF model is a bidirectional graph which consists of three random variables: hidden, observation, and validity. It temporally prunes invalid nodes and links edges among valid nodes by verifying validities of all nodes. In order to apply the proposed DMRF model to the object tracking framework, we use an image block lattice model exactly correspond to nodes and edges in the DMRF model and utilize the mean-shift belief propagation (MSBP). The proposed object tracking method using the DMRF surprisingly tracks a heavily occluded object even if the occluded region is more than 70~80%. Experimental results show that the proposed tracking method gives good tracking performance even on various tracking image sequences(ex. human and face) with heavy occlusion.

Web-based Traffic Management for Customer Network Management

Virtual private network are defined as network partitions of shared public network resources between multiple customers to form a private network that appears private to the users but is still part of the larger public networks. We suggest architecture of an integrated CNM system that is operated on the Web-based traffic management technology. The CNM system provides the customer with a Web-interface to view their entire VPN networks.

Customer Network Management of VPN Services

A virtual private network (VPN) is a collection of several physically-separate, corporate site networks that are interconnected securely over a common network shared among many corporations. The customer network management (CNM) provides the customer with a Web-interface to view their entire VPN networks. We have proposed a .NET-based customer network management using the Web technologies. This paper proposes customer network management system (CNMS) architecture, and network management of VPN services

Character Visualization in Miniature Environments with an Optical See-through Head-Mounted Display

In this paper, we present a visualization method of virtual characters to provide augmented reality (AR) experiences for a user wearing an optical see-through head-mounted display (HMD). First of all, we execute plane detection to find position of a users real desk. Second, we perform position update of virtual characters to connect real-time location information for reflecting the height of miniature objects on the desk. Finally, we visualize virtual characters that is involved in environmental properties with the optical based see-through HMD. Our method can be applied to AR contents with respect to contexts of environmental information surrounding the user such as miniature elements.