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대수정규-나카가미(Nakagami)페이딩을 받은 간섭파가 불완전 전력제어된 DS/CDMA 셀룰러 시스템에 미치는 영향
현근주,김남수 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.8
본 논문에서는 대수정규 쉐도잉(shadowing)과 나카가미(Nakagami) 페이딩을 함께 받은 타 시스템의 동일 채널 간섭파가 불완전 전력제어 된 DS/CDMA 셀룰러 시스템의 용량에 미치는 영향을 분석하였다. 분석에는 먼저 간섭을 고려하지 않고 불완전 전력제어만을 해석한 Prasad와 Jansen의 결과와 비교하였으며, 대수정규-나카가미 페이딩을 받은 다중 간섭은 Schwartz와 Yeh가 제시한 방법을 적용하여 DS/CDMA 시스템에 미치는 영향을 오수신확률로 유도하였다. 유도한 오수신확률에 대해 불완전 전력제어, 페이딩 지수, 처리이득, 전력비, 간섭수, 음성화율 등을 파라미터로 하여 각각의 상황에서 DS/CDMA 시스템의 가입자 용량 감소를 분석하였다. 결과로부터 DS/CDMA 시스템의 용량은 전력제어 오차와 간섭파의 증가에 매우 민감하여 전력제어 오차가 클수록, 무선채널 환경의 페이딩이 심할수록, 또한 간섭파의 수가 증가할수록 감소하였다. In this paper, we analyze the effect of co-channel interferers coming from other systems with composite log-normal shadowing and Nakagami fading on the capacity of the imperfect power-controlled DS/CDMA cellular system. The analytical results are compared with the results of Prasad and Jansen in which they derive the result under the condition of imperfect power-control of DS/CDMA system and without considering interference. And the outage probability is calculated fro the effect of the log-normal/Nakagami faded inferers on DS/CDMA system using Schwartz and Yeh's method. With the deviation of outage probability, we analyzed the decreases in the capacity of DS/CDMA system with the variation of the paramenters of the imperfect power-control, the fadig index, the processing gain, the power ratio, the voice activity factor, and the number of interferers. Analysis reuslts have shown that the capacity of DS/CDMA system is very sensitive to the imperfect power-control and the number of interferers. It is shown that the DS/CDMA system capacity decreased according to increase of the deviation of the impertect power-control, the increase of the fading, and the increase of interferer number.
상관된 대수 정규-나카가미 페이딩을 받은 다중 간섭파가 DS-CDMA 시스템에 미치는 영향
이현행,현근주,김남수 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1
In the paper, We have considered the correlation coefficient that wasn't reflected to compute the performance of DS-CDMA in the real wireless channel. Also, according to increase of the log-normal variable, the number of interference, and the variance of interference and change of correlation coefficient, have analyzed the probability of call drop and the capacity of user in DS-CDMA Cellular system. In the analysis, We have analyzed the effect of multiple wave interference on DS-CDMA Cellular system by the proposed method by Schwartz and Yeh. Also, the effect of reciprocal correlated multiple wave interference on DS-CDMA system is analyzed by outage probability and analyzed capacity of DS-CDMA system, according to the change of the correlation coefficient, imperfect power control, processing gain, signal to noise, number of interference, voice activity, etc, respectively. From the results, we have known the capacity of DS-CDMA system is much sensitively affected by increase of the correlation coefficient and the number of interference. Also, the more the error of the power control increase and the fading of the mobile channel is severe, the more the outage probability increases and the capacity of the system reduces.
항만 BIM 플랫폼의 클라우드 서비스를 위한 IaaS+PaaS 통합 환경 개발
문현석,현근주,김원식 한국BIM학회 2019 KIBIM Magazine Vol.9 No.4
Because the existing BIM platform is based on user services, the focus is on the development of SaaS (Software as a Service), which provides business services online. However, since a harbor is a security facility, the harbor BIM platform is preferably provided in a private form, rather than relying on the infrastructure environment provided by external cloud providers. Therefore, this study analyzes and reviews the main functions to be provided as SaaS services of the harbor BIM platform. The goal is to build a cloud-based harbor BIM platform that can provide this service to users. To this end, we built IaaS (Infrastructure as a Service) environment of the harbor BIM platform based on the open source Open Stack and integrate and develop PaaS environment with Open Shift applied with IaaS. We applied the GPU to the harbor BIM platform to verify the performance of the harbor BIM platform, and found that the rendering and loading times are improved. In particular, it is expected to reduce the cost of introduction and provide it as the basic cloud environment of similar BIM platform for infrastructure facilities.
최성우,현근주,김현승 한국BIM학회 2023 KIBIM Magazine Vol.13 No.4
In recent years, the mandatory use of BIM has been actively promoted due to the digital transformation of the construction industry. However, the CDE (Common Data Environment) system, which is an essential element for operating BIM, has not been established in accordance with the domestic situation. To solve this problem, this study analyzed the results of previous studies, including the ISO 19650 standard and domestic CDE system requirements, and developed BIM-based collaboration functions that are suitable for the domestic construction industry through functional analysis of domestic and foreign commercial CDE solutions. And we developed a BIM collaboration framework to provide BIM-based collaboration functions as a service by using cloud technologies such as IaaS, PaaS, and SaaS to provide infrastructure resources flexibly and flexibly. The BIM collaboration framework developed in this study meets most of the CDE requirements of ISO1965, so it can secure competitiveness when bidding for overseas BIM projects. Also, because the BIM collaboration functions can be selectively applied to build a BIM-based collaboration platform, it is expected that the utilization of the BIM collaboration framework will be high, as it can minimize not only the time to build the platform but also the operating costs, and the usability is higher than that of existing commercial BIM CDE solutions.