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Now showing items 1 - 16 of 59

  • METHOD AND APPARATUS FOR COMMUNICATING IN WIRELESS COMMUNICATION SYSTEM

    The present disclosure relates to a 5G or a pre-5G communication system for supporting a higher data rate following 4G communication systems such as LTE. In accordance with an embodiment of the present disclosure, a method of a base station includes: checking an operation mode depending on whether beam sweeping is supported, transmitting a signal related to the operation mode to a terminal, and performing communication with the terminal according to the operation mode.
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  • METHOD AND DEVICE FOR PROVIDING CONTROL INFORMATION FOR DIFFERENT SERVICES

    The present disclosure relates to a 5G or pre-5G communication system to be provided to support a higher data transmission rate since 4G communication systems like LTE. The present disclosure relates to a method for providing control information for different services of a base station. A method of a first terminal includes: receiving control information; identifying a control channel for the first terminal based on the control information; and decoding information received in the control channel for the first terminal based on superposition transmission related information included in the control information.
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  • Numerical Simulations of Local Scour at Samsan Bridge Piers in Korea

    Lee, Jooyong   Park, Sun-Kyu   Hong, Sungnam  

    The Samsan Bridge connects Ganghwa Island and Incheon in the mid-western region of South Korea. The country is making an effort to improve access to the island from its major cities, and the construction of the bridge is part of that process. External factors such as wind waves, tide currents, currents, and scour depths around piers should be considered in the construction of a bridge. In order to obtain scour depth values around bridge piers, this study conducted numerical simulations on morphological changes using the SADEM (SAnd Deposit and Erosion Model). The morphological changes were calculated by solving the conservation of sediment transport equation. A field measurement was performed at the Seokmo channel in the Han River estuary (South Korea) to verify the numerical results. A 153x210 grid system with a coarse grid size of 22.8 x 30 km was used in the SADEM. The maximum stream velocities of 10, 50, and 100-year flood return periods during the ebb tide contributes to sediment mobilization in the Seokmo channel. The maximum scour depth was calculated to be 9 m around the central bridges pier during the flood ebb for the 100-year return period. This was due to the upstream discharge during river flooding. The results of the numerical simulations are expected to be objective indicators of optimal design, construction, and future maintenance of the Samsan Bridge.
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  • Analysis of Expressway Bridge Deck Slab Deterioration

    You, Jungbhin   Park, Jongho   Lee, Cheong   Park, Sunkyu   Hong, Sungnam  

    In this study, the deterioration factors that affect the damage on the bridge deck slab wrapped with existing asphalt were estimated and analyzed to identify the final deterioration factors and a damage rate estimation equation was proposed that would predict the extent of damage on the bridge deck slab. Information on a total of 1219 bridges nationwide scale was collected through the GPR system, eight deterioration factors were derived, including number of days of de-icing chemical, de-icing chemical usage, the daily de-icing chemical usage, de-icing chemical usage compared with standard, snowfall, number of snowy days, the altitude, and the number of freeze-thaw days. In addition, through a correlation analysis between the respective deterioration factors and the damage rate of the bridge deck slab, the upper and lower lines were derived. The estimation equation of the damage rate on the bridge deck slab as suggested by this study can be used as a basic data for performing repair and reinforcement at an appropriate time by estimating the damages on the bridge deck slab, accordingly, it is expected to provide priority for repair and reinforcement work, and to citify out effective bridge maintenance as an appropriate amount of budget can be doubled.
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  • Optimal mix and freeze-thaw durability of polysulfide polymer concrete

    Hong, Sungnam   Kim, Hyeonjun   Park, Sun-Kyu  

    A study was conducted to determine the optimal mix design for polysulfide polymer concrete (PPC). Two stage binder tests and polymer concrete mixing tests were carried out for this purpose. The optimal mixing ratio was determined from the test results. In addition, the strength and freeze-thaw resistance of specimens produced using the optimal mixing ratio were evaluated. The results of the strength tests showed that the specimens satisfied the strength requirements of the relevant design codes. Repeated freezing and thawing significantly decreased the mechanical strength of the specimens but had an insignificant effect on the specimens' relative dynamic modulus of elasticity (RDME). It was found that more than 300 freeze-thaw cycles could cause a problem for PPC in terms of its strength. (C) 2016 Elsevier Ltd. All rights reserved.
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  • TRANSMIT DIVERSITY METHOD FOR FQAM AND APPARATUS THEREOF

    The present invention relates to a transmit diversity method for FQAM and an apparatus therefor. According to the present invention, a transmit diversity method for FQAM and an apparatus therefor are provided, the transmit diversity method comprising the steps of: modulating data into at least one FQAM symbol; interleaving a plurality of tones constituting the at least one FQAM symbol such that tones having the same index are located in adjacent resources; and transmitting the at least one interleaved FQAM symbol through at least one transceving unit.
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  • Optimal mix and freeze-thaw durability of polysulfide polymer concrete

    Hong, Sungnam   Kim, Hyeonjun   Park, Sun-Kyu  

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  • An Introduction of AELIS (Aquatic Environment Life-saving Integrated System)

    Kang, Dae Young   Hong, Sungnam   Lee, Jooyong  

    AELIS (Aquatic Environment Life-saving Integrated System) is designed to monitor the high profiles of drowning and the swimmers approaching the swimming boundary lines in real time in order to prevent accidents in the water environment and maintain high standard of the safety. It also detects the swimmers who attempt to get in the water without lifeguards at night, which has high possibility of drowning. The system automatically recognize the potential danger in the blind spots where lifeguards hardly manage. AELIS proactively reduces the risk of life-threatening accidents and supports fast rescue by paging to the lifeguards and safety officers of the facilities. AELIS utilizes an image perception algorithm to detect violation of swimming boundaries and keep tracking of swimmers during its operation. The system is developed based on intelligent video surveillance algorithm, the CCTV, and Geographical Information System (GIS), which enables real time warning to the safety operators in the aquatic environment.
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  • Rip Current Zoning Map to Manage Safety at Haeundae Beach, South Korea

    Lee, Gyumin   Hong, Sungnam   Lee, Changwoo   Kim, Jinsoo   Lee, Jooyong  

    Rip currents are well-known in South Korea. Between July and August 2012, rescue workers covering Busan's beaches were on high alert for rip currents. Rescuers pay particular attention to Haeundae Beach near the Paradise Hotel because it is the frequent site of these currents. In July and August of 2012, 62 fast-moving rip currents were observed with maximum speeds of 2.5 m/s. During this period 187 people were rescued at Haeundae Beach after being dragged into deeper waters by these currents; fortunately, no casualties were reported. Authorities caution that ideal weather conditions for rip currents will persist, so this phenomenon could occur again at any time. In response to this public safety threat, the Korean Meteorological Administration plans to implement automatic monitoring systems for forecasting rip current generation at Haeundae Beach. In this study, we propose an approach for mapping the rip current risk to improve safety management at Haeundae Beach. First, we determine the spatial occurrence rate of rip currents using a field monitoring system based on closed-circuit television (CCTV) images and the Haeundae Current Model (HAECUM) rip current prediction system; the velocity and direction of the rip currents are also considered. This information is then combined with vulnerability factors such as the distribution of beachgoers and the capacity of lifeguards to produce a risk assessment map of rip currents at Haeundae Beach.
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  • METHOD AND APPARATUS FOR ESTIMATING CHANNEL INFORMATION

    Disclosed are a method and an apparatus for estimating channel information. A terminal estimates a channel coefficient for each of subcarriers included in each symbol of the received signals, calculates power of the received signal matched to each of the subcarriers, calculates an interference estimation parameter for each of the subcarriers based on the power of the received signal matched to each of the subcarriers and based on power of a channel coefficient for a subcarrier on which the received signal has maximum power among the subcarriers, and calculates a non-Gaussian characteristic parameter of an interference signal related to the received signals based on the interference estimation parameters calculated for the subcarriers of all the symbols of the received signals.
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  • METHOD AND DEVICE FOR PROVIDING DIFFERENT SERVICES IN MOBILE COMMUNICATION SYSTEM

    The present disclosure relates to a method and device for providing different services in a mobile communication system. In an embodiment, a base station sets interference influence information including information about interference of a second signal of a second system using a second TTI with regard to a first signal of a first system using a first transmission time interval (TTI). Also, the base station transmits the first signal of the first system to a terminal, and transmits the interference influence information to the terminal in a predetermined time. In a situation where different services coexist, an HARQ retransmission technique is provided for effectively overcoming a transmission failure caused by influence of interference between services.
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  • DEVICE AND METHOD FOR SUPPORTING DIFFERENT SERVICES IN WIRELESS COMMUNICATION SYSTEM

    The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transmission rate beyond a 4th generation (4G) communication system such as long term evolution (LTE). An operation method of a base station in a wireless communication system comprises the steps of: reallocating a resource, which has been allocated to a first service, to a second service in order to provide the second service; transmitting control information related to at least one reference signal punctured for reallocation of the resource; and transmitting the at least one punctured reference signal via a resource different from the resource having been allocated to the second service.
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  • Behavior of Concrete Beams with Peel-Plied Aramid-Fiber-Reinforced Polymer Plates

    Hong, Sungnam   Park, Sun-Kyu  

    The effect of fiber-reinforced polymer (FRP) plates, to which a peel-ply was fastened to increase their bonding area, on the behavior of strengthened concrete beams was investigated. A total of six concrete beams were tested. For the FRP plates, aramid-fiber-reinforced polymer (AFRP) ones were used. The test variables included their surface treatment (smooth and deformed), the depth of removal of concrete cover (0 and 10 mm), and the number of the plates. Each beam was tested in four-point bending under displacement control up to failure. Based on the experimental results obtained, the effect of the peel-plied AFRP plates on the flexural behavior of the concrete beams was evaluated.
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  • METHOD AND APPARATUS FOR PROVIDING DIFFERENT SERVICES IN MOBILE COMMUNICATION SYSTEM

    The present disclosure relates to 5G or pre-5G communication systems capable of achieving much higher data rates than 4G communication systems like LTE systems. A method for a base station to provide different services may include determining overlap related information for a first terminal of a first system employing a first transmission time interval (TTI) and a second terminal of a second system employing a second TTI different from the first TTI. The method may also include transmitting scheduling information containing the overlap related information to the first terminal and the second terminal and transmitting data to the first terminal and the second terminal based on the overlap related information.
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  • Behavior of Concrete Beams with Peel-Plied Aramid-Fiber-Reinforced Polymer Plates

    Hong, Sungnam   Park, Sun-Kyu  

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  • Qualitative Research of E-learning Success Model in the Hospitality Industry

    Hong, Sungnam   Eliot Park, Taesu   Han, Jinsoo  

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