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For augmented reality (AR), computer-generated virtual objects are overlapped on the image of a real world. Since a disturbing real object (e.g, a moving human) on the display of an AR device reduces the immersion to AR experiences, the virtual objects need to be augmented after eliminating the disturbing object. From this motivation, this paper presents mediated reality (MR) photography, where the...
Recently, industry demands systematic safety management to decrease accident rates. However, existing safety management in industry worksites depends on a small number of safety supervisors. In particular, in case of shipbuilding industry, thousands of workers are working concurrently in wide areas of worksites. Therefore, choosing and monitoring high risk zones by priority at current status in time...
Molecular communication in nanonetworks is an emerging communication paradigm that uses molecules as information carriers. Achieving a secure information exchange is one of the practical challenges that need to be considered to address the potential of molecular communications in nanonetworks. In this article, we have introduced secure channel into molecular communications to prevent eavesdropping...
In this paper, the system-level performance of nonorthogonal multiple access (NOMA) in coordinated direct and relay transmission (CDRT) is investigated. Considering a successive interference cancellation (SIC) receiver under the 3D channel model for LTE, the system-level performance of the NOMA-CDRT is compared to the NOMA in non-coordinated direct and relay transmission (nCDRT). Simulation results...
This paper presents basic considerations on the mixed support of TDMA (Time Division Multiple Access) and SCPC (Single Channel Per Carrier) transmission for satellite disaster communications network. Since each of TDMA and SCPC transmission has its own advantages in efficiency and flexibility according to the network characteristics, integral use of them could lead to the improvements in bandwidth...
This paper presents the considerations on NCR (Network Clock Reference) variations which impact on the stability of the satellite interactive system operation. We identified what kinds of factors can influence system performance in timing synchronization aspects. The amount of impacts that each factors can cause to the system operations from the realistic calculations and corresponding solutions are...
The orbital angular momentum modes increase the system capacity and the spectral efficiency when multiplexing technology in microwave and optic communication systems is used. Despite its effectiveness, OAM for wireless communications has problems due to its divergence characteristics. In this paper an orbital angular momentum beam by the microwave antenna was presented as a pseudo-bessel mode which...
The number of users is interested in generating new contents by utilizing and editing existing videos. In order to utilize the existing videos, a video retrieval system is necessary to retrieve an appropriate source of videos. However, since the existing video retrieval system is based on keyword matching, there is a limitation to find videos they want. In this paper, we propose a query expansion...
Recently, partial video clips extracted form full video have been consumed in general. Selecting and watching a specific scene among whole video when he wants to do is a new trend. By the way, these partial video clips are generated manually. It requires of much time and cost. In this paper we will propose requirements of VoD clip service and the Scene Studio: Authoring tool for VoD clip services.
The ECG (electrocardiogram) signal measurement in a portable device faces a big challenge to avoid noise. Baseline wandering is one of them. In this study, we proposed a modified step-size of NLMS adaptive filter to eliminate baseline noise from ECG signals. The designed method mainly adjusts initial filter step-size to reduce distortion of original ECG signals characteristic after eliminate baseline...
Container-based virtualization offers several advantages such as high performance, resource efficiency, and agile environment, which can make IoT device management easy. Though previous studies introduce container-based virtualization to IoT devices, they do not address different network modes of containers and the performance issues. Because the network performance is an important factor in IoT,...
In this paper, we propose a Mobile Crowd Sensing application based on Community Information-Centric Networking to collect opportunistic sensing data in limited area where it restricts radius of Bluetooth Low Energy beacon. The application has more valuable features by comparing with common Mobile Crowd Sensing one. First is to support data integrity and utilize simple communication model according...
This paper describes the clutter loss characteristic for the building clutter losses in millimeter wave bands for small urban city in Republic of Korea. The measurement campaign has been performed to a small town in Daejeon city, which was selected to represent the over-rooftop regions of urban low rise environment. As results, we found that the clutter losses according to the distance from the transmitter...
In Information-Centric Networking (ICN), the name resolution is defined as the first step of ICN routing which translates a content name to locators of providers/sources that can provide the content and it can be omitted with the hierarchical name based routing like in CCN. However, we propose to use the name resolution step even for the hierarchical name based routing to address the routing scalability...
Efforts to open and share research outcomes (publications, data, etc.) by public funds have been performed. And efforts to spread knowledge more easily and quickly have been also promoted. However, in Korea, we do not manage the research outcomes as core assets that can be produced and reused by public funds. In this paper, we analyze the characteristics of overseas studies in terms of deposition,...
Recently, the amount of spatial information generated in real time due to the use of SNS is increasing rapidly. Research is also actively underway to extract only the information of interest from real-time spatial information. Then, the spatial information generated in the SNS can be requested by the API of the corresponding SNS company. In this case, the responding spatial information is provided...
The integration of Device-to-Device (D2D) communication into a cellular network improves system spectral efficiency, increases capacity, reduces power consumption and also reduces traffic to the evolved NodeB (eNB). However, D2D communication generates interference to the conventional cellular network which deteriorates the system performance. In this paper, we propose a radio resource allocation...
This paper proposes two non-uniform quantization schemes and also introduces an implementation system based on Software Defined Radio (SDR) consisting of GNU Radio and Universal Software defined Radio Peripheral (USRP) to sense a spectrum. In cognitive radio (CR) systems, detection and error probability are representative indicators of system performance. These performance indicators are influenced...
Sparse code multiple access (SCMA) is a nonorthogonal multiple access scheme based on a multi-dimensional codebook with sparse codewords. The sparsity property of SCMA allows the receiver to take advantage of low-complexity message passing algorithm (MPA) detector with maximum likelihood (ML)-like performance. The use of multiple antennas at the SCMA receiver will improve the detection performance...
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