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콘크리트 포장 유지보수를 위한 단면보수 공법의 제설제 사용량에 따른 수명분석
최승원(Choi, Seungwon),장태진(Jang, TaeJin),정해국(Jung, Haekook),김승원(Kim, Seungwon),박철우(Park, Cheolwoo) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
이 논문은 콘크리트 포장 유지보수 체계 개선의 일환으로 단면보수 공법의 수명을 제설제 사용량에 따른 영향도를 분석하였다. 단면보수 공법이 적용된 후 재보수까지의 기간을 단면보수 공법의 수명으로 가정하였고, 구간별 제설제 사용량으로 구분하여 단면보수 공법의 평균 수명을 분석하였다. 분석결과 제설제 사용량이 증가할수록 단면보수 공법의 수명이 점진적으로 감소하는 경향을 나타내는 것을 확인하였다. This paper analyzed the effect of the surface repair methods on the cement concrete pavement with respect to the amount of de-icing agent used. The period from the application to renovation of the surface repair method was assumed to be the life of the surface repair method, As a result of the analysis, it was confirmed that the life of the surface repair method gradually decreased as the amount of de-icing agent used increased.
GPU를 이용한 TDD LTE MU-MIMO 시스템에서의 재전송 구현
박종근,최승원,Park, Jonggeun,Choi, Seungwon 디지털산업정보학회 2017 디지털산업정보학회논문지 Vol.13 No.2
The TDD LTE MU-MIMO HARQ system is designed and implemented using GPU based on 3GPP Rel.10 standard. The system consists of the DU part of the base station and the terminal using the general computer based on the GeForce GTX TITAN graphics card provided by NIVIDIA, and constructed the part of the RU using USRP N210 provided by Ettus. In the implementation part, SDR standard is applied, so that various communication standards can be compatible with software. The retransmission is implemented by combining the previous data with the retransmission data using Chase Combining among HARQ methods. In order to confirm that the retransmission was successful, the performance evaluation used LLR constellation. First, if there is an error in the data, the LLR value is not distributed at the corresponding position. in this case, a retransmission is performed to chase combine the previously stored error data and retransmitted data. As a result, the LLR value was distributed at the position of the corresponding LLR value per bit. Through this, it can be confirmed that error - free data is formed by using Chase Combining after retransmission.
면허기반 주파수 공동 사용을 위한 멀티모드 단말기 설계 및 구현
김용,최승원,Jin, Yong,Choi, Seungwon 디지털산업정보학회 2016 디지털산업정보학회논문지 Vol.12 No.4
Recently, as the heterogeneous network (HetNet) has been deployed widely to support various kinds of Radio Access Networks(RANs) with a combination of Macro, Pico, and/or Femto cells, research and standardization efforts have been very active regarding the concept of Licensed Shared Access (LSA) for supporting spectrum sharing. In order for a mobile device to efficiently support the spectrum sharing, the mobile device shall be reconfigurable, meaning that its radio application code has to be adaptively changed in accordance with the hopping of desired spectral band. Especially, Working Group 2 (WG2) of Technical Committee (TC) Reconfigurable Radio System (RRS) of European Telecommunications Standards Institute (ETSI) has been a main driving force for developing standard architecture for Multi-mode Mobile Device (MD) that can be applied to the LSA system. In this paper, we introduce the Multi-mode MD architecture for supporting LSA-based spectrum sharing. An implementation of a test-bed of Multi-mode MD is presented in order to verify the feasibility of the standard MD architecture for the purpose of LSA-based spectrum sharing through various experimental tests.
멀티모드 단말기를 위한 셀 경계 지역에서의 SINR 기반 사용자 선택 방법
금동현,최승원,Kum, Donghyun,Choi, Seungwon 디지털산업정보학회 2015 디지털산업정보학회논문지 Vol.11 No.3
We consider a cell edge environment. In cell edge, a user interfered by signal which is generated by a base stations not including the user. In cell edge environment, that is, there are inter cell interference (ICI) as well as multi user interference (MUI). Coordinated multi-point transmission (CoMP) is a technique which mitigates ICI between base stations. In CoMP, therefore, base stations can coordinate with each other by sharing user state information (CSI) in order to mitigate ICI. To improve sum rate performance in CoMP, each base station should generate optimal user group and transmit data to users selected in the optimal user group. In this paper, we propose a user selection algorithm in CoMP. The proposed method use signal to interference plus noise ratio (SINR) as criterion of selecting users. Because base station can't measure accurate SINR of users, in this paper, we estimate SINR equation considering ICI as well as MUI. Also, we propose a user selection algorithm based on the estimated SINR. Through MATAL simulation, we verify that the proposed method improves the system sum rate by an average of 1.5 ~ 3 bps/Hz compared to the conventional method.
5G 이동통신 셀 설계를 위한 타부 탐색과 유전 알고리즘의 성능
권오현,안흥섭,최승원,Kwon, Ohyun,Ahn, Heungseop,Choi, Seungwon 디지털산업정보학회 2017 디지털산업정보학회논문지 Vol.13 No.3
The fifth generation(5G) of wireless networks will connect not only smart phone but also unimaginable things. Therefore, 5G cellular network is facing the soaring traffic demand of numerous user devices. To solve this problem, a huge amount of 5G base stations will need to be installed. The base station positioning problem is an NP-hard problem that does not know how long it will take to solve the problem. Because, it can not find an answer other than to check the number of all cases. In this paper, to solve the NP hard problem, we compare the tabu search and the genetic algorithm using real maps for optimal cell planning. We also perform Monte Carlo simulations to study the performance of the Tabu search and Genetic algorithm for 5G cell planning. As a results, Tabu search required 2.95 times less computation time than Genetic algorithm and showed accuracy difference of 2dBm.
Hybrid A* 와 강화학습을 이용한 다중 에이전트 경로 계획
최범성(Beomseong Choi),최승원(Seungwon Choi),류재언(Jaeun Ryu),허건수(Kunsoo Huh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
As autonomous driving technology has recently expanded and increased, the need for a path planning technology considering interaction with surrounding agents is increasing. In addition, Multi-Agent path planning is essential when a large number of autonomous driving mobility drives in a narrow environment. In particular, Multi-Agent path planning requires collision avoidance algorithms for dynamic obstacles. Therefore, in this paper, we propose a decentralized Multi-Agent path planning algorithm considering their interactions with surrounding agents. In global path planning, we use Hybrid A* to allow creating physically feasible paths by considering the kinematic characteristics of mobility. In local path planning, we used Proximal Policy Optimization(PPO), one of the reinforcement learning methods, to learn interactions with surrounding agents. The proposed algorithm is trained and evaluated through Unity ML-Agents. As a result of the simulation, we find that the success rate increases due to fewer collisions with surrounding agents than the traditionally frequently used RRT*-based path planning methods.
WPAN에서 간섭을 피하기 위한 멀티모드 단말기 채널등급 방법
정성원,금동현,최승원,Jung, Sungwon,Kum, Donghyun,Choi, Seungwon 디지털산업정보학회 2015 디지털산업정보학회논문지 Vol.11 No.3
There is a new evolution in technological advancement taking place called the Internet of Things (IoT), The IoT enables physical world objects in our surrounding to be connected to the Internet. ISM (Industrial Scientific Medical) band that is 2.4GHz band authorized free of charge is being widely used for smart devices. Accordingly studies have been continuously conducted on the possibility of coexistence among nodes using ISM band. In particular, the interference of IEEE 802.11b based Wi-Fi devices using overlapping channel during communication among IEEE 802.15.4 based wireless sensor nodes suitable for low-power, low-speed communication using ISM band. Because serious network performance deterioration of wireless sensor networks. In this paper, we will propose an algorithm that identifies the possibility of using more accurate channels by mixing utilization of interference signal and RSSI (Received Signal Strength Indicator) Min/Max/Activity of Interference signal by wireless sensor nodes. In addition, it will verify our algorithm by using OPNET Network verification simulator.