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IEEE 802.11ax UORA에서 우선순위 기반 추가 백오프 스테이지를 통한 처리량 향상
석지원(Jiwon Seok),김선명(Sunmyeng Kim) 한국정보기술학회 2021 Proceedings of KIIT Conference Vol.2021 No.11
IIEEE 802.11ax UORA는 랜덤 채널 접근 방법에 기반하여 동작하기 때문에 경쟁하는 단말 수가 증가하면, 충돌이 많이 발생하여 채널의 처리량이 저하되는 문제점을 갖고 있다. 본 논문에서는 채널 접근 전에 추가적인 백오프 스테이지를 통해 전송 간 충돌을 회피하여, 조밀한 네트워크 환경에서 처리량을 향상시킨다. In IEEE 802.11ax UORA, the more number of STAs participating in random access, the more rate of transmission in which collision occurs, and thus the throughput of the channel decreases. In this paper, Collision between transmissions is avoided through an additional backoff stage before random access. The proposed method improves throughput in dense networks.
박지훈,석지원,이상아,권오훈,이경숙,허용,윤충식,Park, Jihoon,Seok, Jiwon,Lee, Sangah,Kwon, Ohhun,Lee, Kyungsuk,Heo, Yong,Yoon, Chungsik 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.5
Objectives: There are many hazardous agents at livestock farms. In particular, gases can be detrimental to both workers and animals. This study evaluated ammonia and hydrogen sulfide concentrations in broiler hen barns and beef cattle barns according to sampling location and height. Methods: Three broiler hen barns and three beef cattle barns were selected for gas monitoring in this study. Ammonia and hydrogen sulfide concentrations were measured using a direct-reading instrument which could measure the target gases simultaneously. Gas monitoring was conducted at human breathing height and animal breathing height at three points in each livestock farm. Results: Ammonia concentrations at the broiler hen barns ranged from 3.3 to 12.5 ppm by sampling location and height, but hydrogen sulfide was not detected. In the beef cattle barns, ammonia ranged from 3.1 to 16.3 ppm and low concentrations of hydrogen sulfide were detected at some animal breathing heights. The gas concentrations detected at each livestock farm were significantly higher in the animal breathing zones than in human breathing zones (p<0.0001). Conclusions: We found a difference in gas concentrations between human breathing zones and animal breathing zones. Gas monitoring should be conducted to improve the related environment considering both workers' and animals' health and safety.