Purpose – The purpose of this study is to develop and analyse the usage status, level of satisfaction and success model of a mobile library service system in Taiwan. The research results could serve as a reference for the development, evaluation and improvement of libraries’ mobile services. Design/methodology/approach – This study designed a mobile library service system and used the informational system success model to evaluate its use status and level of satisfaction and, thus, to develop a success model for a mobile library service system. Findings – Results showed that students’ level of satisfaction with the mobile library service system had a positive correlation with the usage status indicated that the system could help them to improve their work efficiency, such as by reducing time spent searching for books and cost of obtaining electronic resources. The students also expressed a willingness to continue using the mobile library service system. Practical implications – In general, the students thought that the mobile library service system could reduce the time needed to search for book-related information, but that the service quality should be improved. Therefore, this study suggests that the education and training of system service personnel should be enhanced and that easy-to-use functions be provided to promote the users’ level of satisfaction and willingness to use the system. Originality/value – This study developed a mobile library service system and invited students studying in the National University of Tainan, in southern Taiwan, to be the subjects in an experiment, with a goal to evaluate the success of a model mobile library. The findings showed that the overall explanatory power (R2) of this model was 55 per cent and, thus, that the findings of this work have practical significance.

Purpose -The aim of this paper is to improve the service quality of digital libraries (DLs) through an evaluation model for DLs' user interfaces. This evaluation model can provide a useful reference for existing DLs or relevant research. Design/methodology/approach -Relevant literature was synthesized, an evaluation framework was established, and the Fuzzy AHP was employed to investigate the evaluation model for DLs' user interfaces, obtain the relative weights for the importance of the evaluation criteria, and establish the priority ranking for the criteria of DLs' user interfaces. Findings -The top five criteria are ease of use, searching, language, presentation, and design, respectively. For users, an interface should be intuitive. Good interface presentation and design are critical when users evaluate a digital library. Practical implications -All of the students, teachers and experts considered that the presentation and design of DL user interfaces were what users had had contact with in the very beginning, and they were critical influential factors in DL user interfaces. Furthermore, ease-of-use and searching were fundamental interface functions, as well as important evaluation criteria. Interfaces should also provide interactive functions to improve interaction, while tailor-made services should be taken into account to establish an excellent interface in order to meet each user's need. Originality/value -The evaluation model for DLs' user interfaces employed in this study will help developers of DL user interfaces discover the criteria that they should aim for as a reference, perform comprehensive criteria evaluation according to their actual needs, and employ top criteria for evaluation.

Purpose – The purpose of this paper is to increase usage rate of libraries in universities and colleges, this study developed a Mobile Library APP System and analyzed users’ usage and level of satisfaction. The analysis results served as the reference for the development and improvement of libraries in universities and colleges’ mobile information systems. Design/methodology/approach – This study developed a Mobile Library APP System and probed into and evaluated college students’ usage and level of satisfaction with the system by using questionnaire. Individual interviews were carried out to find out their standpoints and opinions about their library usage via mobile technology. Findings – The analysis of experiment results showed that students’ attitude toward the Mobile Library APP System was highly positive. This indicated the system certainly assisted them in increasing their work efficiency and their willingness in continuously using this APP system in library-relevant activities. Practical implications – Students’ viewpoints indicated that, by using Mobile Library APP System, they could effectively searched for books, magazines, e-books and other e-resources in a timely manner. The time spent in information searching was shortened and individual work efficiency was promoted. Moreover, in interview sessions, students suggested to add categorized search, book recommendation, book discussion and other functions to increase user population and willingness of continuous usage. Originality/value – To find out the actual usage of the Mobile Library, this study developed the Mobile Library APP System and invited students of National University of Tainan in Taiwan to be experimental subjects. The results of data analysis indicate that the system acquires highly favorable view from student. Thus, it can be inferred that research results of this study are representative and have practical values in real world practice.

Coordinated Multi-Point (CoMP) is an important technique in B4G/5G networks. With CoMP, multiple base stations can be clustered to compose a cooperating set to improve system throughput, especially for the users in cell edges. Existed studies have discussed how to mitigate overloading scenarios and enhance system throughput with CoMP statically. However, static cooperation fixes the set size and neglects the fast-changing of B4G/5G networks. Thus, this paper provides a full study of off-peak hours and overloading scenarios. During off-peak hours, we propose to reduce BSs’ transmission power and use the free radio resource to save energy while guaranteeing users’ QoS. In addition, if large-scale activities happen with crowds gathering or in peak hours, we dynamically compose the cooperating set based on instant traffic requests to adjust base stations’ BSs’ transmission power; thus, the system will efficiently offload the traffic to the member cells which have available radio resources in the cooperating set. Experimental results show that the proposed schemes enhance system throughput, radio resource utilization, and energy efficiency, compared to other existing schemes.

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