Gil Young Choi

A channel allocation scheme considering with collisions and interferences in practical UHF RFID applied communication fields

In this paper, a channel allocation scheme for mediating UHF RFID bands is proposed. This scheme is designed for delivering a less-invasive channel area, a system capability enhancement, and intuitive data offering for overall strict the channel use and standardization UHF band (860 MHz-to-960 MHz). Several critical factors shall be discussed and simulated; thus, we can show the validity of this channel allocation proposal. Mostly, we focused on reducing collision effects among different types of UHF RFID reader systems within a single channel area and this shall be extended through some calculation and simulation works. Based on those works, we could obtain the appropriate solution for allocating each channel at less-invasion levels. This also will be discussed, presented and concluded with simulation results.

Adaptive quality of service resource management in IP networks

Summary form only given. Different quality of service (QoS) requirements have intensified research in dynamic and adaptive communication protocols in order to efficiently exploit high speed network technologies (e.g., gigabit and terabit networks). To support guaranteed application services, IP routers/switches need to support different protocol functions or mechanisms. The existing implementation of standard protocols do not efficiently exploit the resources offered by high-speed networks and consequently, cannot provide network applications with the required high throughput and low latency communication services. We address this limitation and present a framework to provide an adaptive resource management scheme based on the QoS requirements of networked applications in an IP network. The framework categorizes QoS mechanisms into several functions such as classification, flow control, scheduling and traffic policing. The framework provides a multitude of options to implement each of the QoS functions. We also present a real-time resource allocation algorithm (RTRM) that allocates resources to applications based on their quality of service requirements and the current state of the IP router/switch. In this algorithm, the bandwidth and memory utilization are measured and the required resources are computed in order to provide the maximum available resources to the traffic class with highest priority. The results of the experiments conducted reveal that the implementation of the RTRM algorithm guarantees the QoS requirements of applications when compared to traditional nonQoS resource allocation algorithms.

Open programmable switched network architecture for IP-based converged multi-services

With great progress in LAN technologies, users require high quality real-time services as well as data communication. This is expediting network services to be gradually converging over an IP-based network platform, especially in intranet-based enterprise and campus LANs. In this paper, we propose a quality-of-service-supported programmable switched local area network architecture under development, which can provide a variety of converged multi-services on an IP-based converged network.

Design and implementation of QoS network controller for simple management of IP network to support multimedia services

The support of QoS in the IP network is important to provide real-time applications like voice and video. But, the method in which the network uses to distinguish a real-time application and managing those service is one of the problem in supporting QoS in the IP network. The DiffServ is an efficient method of providing QoS capability without putting much burden to the network. The DiffServ architecture defines services in form of service level agreement (SLA), which is an agreement from the customer and service provider requesting differentiated service for the traffic to/from certain nodes. This paper presents a simple and practical method to provide flow based QoS service dynamically in the IP networks. The QoS controller manages the IP network to provide information for the real-time applications. Thus, the network can use that information to provide the needed QoS treatment for the pertaining flow.