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The world is facing the pandemic of infectious diseases. Together with the development of transportation technology, the global spread of diseases continues to accelerate. To examine the correlation between transportation and infection, we did the statistical analysis on the highway transport and the domestic flight based on the GIS in the South Korea. Consequentially, the traffic movement through...
In recent years, a new communication technology emerged by taking advantage of the high-speed switching capabilities of LED known as VLC (Visible Light Communication) has been getting more attention. On the other hand, OFDM is one of the technology that can efficiently utilize a frequency band. In this paper, our goal is to develop a VLC OFDM system, that is easily operable, and capable of high speed...
The purpose of this research is proposing a theory to verify the influence of virtual props trading sites to game loyalty of players. The objects of sampling aims at users who are actually engaged in online games props trading sites. A survey of 459 game players in Taiwan was conducted; research results were generated through the use of descriptive analysis, reliability analysis, correlation analysis,...
Cognitive radio (CR) is an intelligent system for designing modern wireless communication systems. Spectrum sensing is one of the most important issues in CR. This paper presents a semi blind spectrum sensing method which exploits the combination of comb filter and autocorrelator. The proposed method improves the detection performance of blind spectrum sensing in severe noise environments where an...
A cluster formation algorithm is proposed to save the wastage of energy in cooperative spectrum sensing (CSS), in which small number of groups called clusters are made using fuzzy c-means (FCM). Based on spatial correlation, only limited number of SUs are selected from each cluster, whose sensing information is forwarded to their cluster head (CHs). The primary goal of cognitive radio network is spectrum...
In this paper, a new cell selection technique is proposed for millimeter-wave (mm-wave) considering hybrid beamforming structure in data transmission stage. In order to reduce processing time for channel estimation, cell and beam synchronization signals (CBSS) are proposed which are simultaneously transmitted from multiple beams. It is shown by simulation that the proposed technique with the CBSS...
The energy consumption in residential section accounts for over 30% of the world and cost-effective indoor energy management is important. Visible light communication based on variable pulse position modulation (VPPM) is a scheme for efficient and convenient indoor energy management. This paper proposes methods for detecting dimmable packet. First, we describe a method based on correlation bank expanding...
In this paper, an LFM-based random access preamble (RAP) for underwater acoustic cellular systems is proposed. After showing that the conventional RAP used in LTE systems is not appropriate for underwater acoustic cellular systems, a suitable RAP, robust to Doppler effect, is proposed to detect the identity of underwater equipment/node (UE) and estimate the time delay between a UE and an underwater...
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