Mun Kee Choi

Purpose The purpose of this paper is to develop a research model examining users' perceived value of a location-based social networking service (LB-SNS) through hedonic, utilitarian, and social values. This study investigates the impact for each type of perceived value on user satisfaction, behavioural intention to use, and word-of-mouth for LB-SNS.

In this paper, we have studied ubiquitous personal healthcare systems using radio frequency identification (RFID) tag, wearable electrocardiogram (ECG) sensor, smart card, PQRM Grid computing, PhysioNet, wired/wireless network, and public-key infrastructure (PKI) technologies. For research and development of these systems, we have also designed and modeled the system architecture and framework workflow, which are described by six classified core players or subsystems. They are consisting of the

Hybrid electric vehicles (HEVs) are alternatives to conventional vehicles, and have a critical role in migrating climate change and saving oil resources. Even though supported by government with several incentives, HEVs are still less accepted by consumers. Previous studies stated it mainly due to innovative perceived risks, such as perceived economic loss and psychology concern, but without considering the moderation effect of geographical culture and economic environment. Besides, the effect o

This paper proposes a flow-based admission control algorithm through an Asynchronous Transfer Mode (ATM) based Multi-Protocol Label Switching (MPLS) network for multiple service class environments of Integrated Service (IntServ) and Differentiated Service (DiffServ). We propose the Integrated Packet Scheduler to accommodate IntServ and Best Effort traffic through the DiffServ-aware MPLS core network. The numerical results of the proposed algorithm achieve reliable delay-bounded Quality of Servic

As information technology rapidly develops and the period required to enter new technology shortens, there emerges a wide variety of alternatives for consumers. When there are many alternatives in the market, users choose after making comparisons. This process of making comparisons is our research key. We established a research model to find a mixed effect that comes from new attitudes to technology adoption and alternative’s continuous usage intention. The effect is revealed through a relative

Common packet channel (CPCH) access is an efficient approach to support packet data transmissions in a wideband code-division multiple-access (W-CDMA) system. This letter introduces a simple access control method for CPCH, which results in higher throughput. This method also provides prioritized services for different traffic classes. Each traffic class is assigned a distinct transmit permission probability that is determined at the new call initiation stage based on the status of CPCH channel o

In this paper, we analyze the performance benefits of broadband ATM networks when the call control and management flows are separated from user data flows. The virtual path tunneling concept for control and management flows are applied to the same physical ATM networks. The behaviors of channel throughput and transfer delay are analyzed. It results that the proposed virtual short-cut paths can maintain the network being stable with acceptable bandwidth. They are very useful to provide the stable

The overall design issues for broadband asynchronous transfer mode (ATM) networks are investigated. Three kinds of network design requirements are considered: user grade-of-service (GOS) requirements, network manager requirements, and system designer requirements. The design balance among user, network manager, and designer performance measures is shown. It is shown that the design parameters for broadband ATM exchange can be tuned within the acceptable sets by the layering concept on performanc

We investigate the overall design issues for broadband ATM network. Three kinds of network design requirements are considered : user grade-of-service (GOS) requirements, network manager requirements, and system designer requirements. In this work, we are focusing on the balancing problems among performance measures. We suggest that the 'design parameters for broadband ATM exchange would be tuned within the acceptable sets by the layering concept on performance objectives.