The emission characteristics of diesel powered vehicles using conventional diesel fuel and six different biodiesel blends at proportions of 1% (B1), 3% (B3), 5% (B5), and 20% (B20) by volume were investigated. The emission tests were performed following the NEDC (New European Driving Cycle) and...

In this study, to evaluate the potential of a dedicated liquefied petroleum gas-direct injection (LPG-DI) vehicle, regulated and unregulated emissions from a light-duty gasoline direct injection (GDI) vehicle were compared. The vehicle tests were performed on a chassis dynamometer with constant...

This paper proposes a novel simulation method of wind power generation system (WPGS) using PSCAD/EMTDC. The pitch control-based rotation speed control scheme of turbine under variable wind speed is implemented. For the purpose of achieving effective and user-friendly simulation method for...

This study relies on a customer demand-based view to examine how mobile number portability affects competition in the Korean mobile telecommunications market. Using a contingent valuation method, we investigate 1,161 subscribers’ willingness to pay for mobile number portability. The...

To achieve the information society for all, access for all is crucial. However, many countries have reported to have large gender discrepancies in online access and participation. This study empirically verified user perception data and compared the data across countries and genders to determine...

Recently, ICT ecosystems are changing rapidly due to the increasing number of innovative products and services in these ecosystems. Among them, SNS is one of the most important elements that make up the ICT ecosystem. With the phenomenal boom of personal SNS, information and knowledge sharing...

The lack of detailed guideline of network traffic management has led complex conflicts among ICT players. Among them, the most severe case was KT and Samsung's case: Korea Telecom (KT) once blocked Internet connection of Samsung Smart TV service users. This aroused the needs of a reasonable...

The phenomenal advancement of mobile technologies and the large penetration of mobile phones in developing countries have provided alternative solutions to re-engineer public service delivery mechanism. Governments are now challenged to deliver an expanding set of services to citizen given the...

The development and complexity of mobile and smart technologies continues to evolve with a greater speed, attention needs to be turned to the possibility of continuous development. It has become important to monitor users’ post-purchase behavior in order to understand their continued use of...

Digital divide is one of the most concerning issues today. It positions those who 'have-no' access to technology at disadvantage socially and economically. The key to reduce digital divide is to provide access to basic technology and information content. This study explored the role of...