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OBJECTIVE The aim of this study was to develop a self-diagnostic scale that could distinguish smartphone addicts based on the Korean self-diagnostic program for Internet addiction (K-scale) and the smartphone's own features. In addition, the reliability and validity of the smartphone addiction scale (SAS) was demonstrated. METHODS A total of 197(More)
With Cell Range Extension in a heterogeneous network, the users in the range extension area usually suffer from high interference from macro cell. This may degrade the cell-edge user downlink performance if the resource provided in the Low Power Node can not compensate for the loss from the increased interference. This paper proposes an adaptive algorithm(More)
Combining Turbo-codes and high order modulation is a simple but effective way to improve the bandwidth efficiency. Since the Turbo decoder requires binary soft decisions as the input information, the demodulator has to provide bit level soft information (LLR) to it. In this paper, a novel simplified algorithm to calculate LLR is developed, which will(More)
With the development of mobile internet and multi-media service, advanced techniques need to be applied in wireless network to improve user experience. Long term evolution (LTE) systems, which can offer up to 100Mbps downlink date rates, have been deployed in USA and Korea. However, because plenty of complex physical layer algorithms are utilized, network(More)
Introducing relay node to Device-to-Device (D2D) technology can extend the cell coverage range and improve the system performance, and the relay selection is a key point of relay-assisted D2D communication. In this paper, the relay selection problem is discussed for D2D communication underlaying cellular network. We propose a two-stages relay selection and(More)