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무선 랜 성능 향상을 위한 링크 계층 트래픽 제어 알고리즘
최선웅,Choi, Sun-Woong 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.4
오늘날 인프라 무선 랜은 많은 사용자들이 사용하는 중요한 인터넷 접속 기술이다. 무선 랜의 성능은 포화상태에서 시스템의 처리율이 저하되고, 각 노드의 처리율은 시간에 따라 심하게 변화하는 문제점이 있다. 본 논문에서는 링크 계층에서 DCF 시스템의 입력 로드를 조정하여 이러한 문제를 해결하는 트래픽 제어 방법을 제안한다. 트래픽 제어기를 사용하여 DCF로 유입되는 시스템 로드를 적절하게 조정하면 기존 MAC 프로토콜을 수정 없이도 시스템 처리율을 향상시키고 노드의 처리율 변화도 줄일 수 있는 것을 보인다. 또한, 시스템의 상황에 맞는 최적의 시스템 로드를 찾는 동적 제어 알고리즘을 제안하고, ns-2 시뮬레이션을 통하여 성능 향상을 보였다. Wide-spread deployment of infrastructure WLANs has made Wi-Fi an integral part of today's Internet access technology. WLANs suffer from degraded system throughput and each node's throughput fluctuates significantly in the saturation regime. In this paper, we propose a link layer traffic control mechanism which controls the offered load of DCF system. It is shown that the link layer traffic controller can improve DCF system throughput and reduce nodes' throughput fluctuation with properly controlled offered load. We propose a dynamic traffic control algorithm which can find an optimal offered load and show its performance improvement with ns-2 simulation.
입체음향효과 향상을 위한 스테레오-10.2채널 블라인드 업믹스 기법
최선웅,현동일,이석필,박영철,윤대희,Choi, Sun-Woong,Hyun, Dong-Il,Lee, Suk-Pil,Park, Young-Cheol,Youn, Dae-Hee 한국음향학회 2012 韓國音響學會誌 Vol.31 No.5
본 논문에서는 입체음향효과의 향상을 위한 스테레오-10.2채널의 블라인드 업믹스 알고리즘을 제안하였다. 최근에, 소비자들은 더 나은 입체음향효과나 3D 사운드를 즐기길 원하고 다양한 멀티채널 포맷의 등장으로 업믹스 알고리즘들이 연구 되어 왔다. 그러나 기존의 업믹스 알고리즘들은 공간정보를 왜곡하는 문제점을 가지고 있었다. 이러한 문제점을 해결하기위해 전 후방 채널에 대한 이득 조절 및 10.2 채널의 각 채널별 믹싱 알고리즘을 제안한다. 기존의 상용화된 멀티채널 업믹스 알고리즘들과의 주관적 평가 실험결과 제안한 알고리즘은 입력신호의 공간정보를 유지하면서 입체음향효과를 향상시킨 것으로 확인되었다. In this paper, we proposed the stereo-10.2channel blind upmix algorithm for the enhanced 3D sound. Recently, consumers want to enjoy better sound and the use of a various of multichannel configuration has been steadily improved. Thus, upmix algorithms have been researched. However, conventional upmix algorithms have the problem that distorts the spatial information of original source. To solve this problem and enhance the spatial sound quality, we proposed front and rear channel gain adjustment and 10.2 channel upmix algorithm for each additional channel. The listening test results show that it maintains spatial information of stereo input and enhances 3D sound effects unlike other conventional upmix algorithms.
방송 패킷을 활용한 무선 애드혹 네트워크의 이웃 정보 전송절감
최선웅,Choi, Sun-Woong 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.7
무선 애드혹 네트워크에서 동작하는 많은 프로토콜들은 이웃 노드에 대한 정보를 중요하게 사용한다. 이웃 노드에 대한 정보는 Hello 메시지를 주고받음으로써 알 수 있다. 자신기 존재를 알리고 싶은 노드는 주기적으로 Hello 패킷을 전송한다. 하지만, 이러한 Hello 패킷의 전송은 무선 애드혹 네트워크에 큰 제어 부하로 작용하게 된다. 이 논문에서는 Hello 패킷뿐만 아니라 방송 패킷을 활용하여 이웃 노드 정보를 주고받는 방법을 고찰한다. 분석과 컴퓨터 시뮬레이션을 통하여 방송 패킷을 활용하는 기법이 Hello 패킷만을 사용하는 방식에 비하여 상당한 효과를 보인다는 것을 분석한다. Hello 패킷의 전송 주기와 방송 패킷의 전송기가 같다면 42% 정도의 부하 절감 효과가 있다. Neighbor knowledge in wireless ad hoc networks provides important functionality for a number of protocols. The neighbor knowledge is acquired via Hello packets. Hello packets are periodically broadcasted by the nodes which want to advertise their existence. Usage of periodic Hello packet, however, is a big burden on the wireless ad hoc networks. This paper deals with an approach where each node acquires neighbor knowledge by observing not only Hello packets but also broadcasting packets. Analysis and computer simulation results show that the method using broadcast packets offers significant improvement over the method using Hello packet only. When the required hello packet transmission interval and the average broadcasting interval are equal, the overhead reduction is about 42%.
최선웅 ( Choi Sun Woong ) 역사문제연구소 2015 역사문제연구 Vol.19 No.1
This article may be summarized as follows. First, the Donghak Peasant War was turmed the `Donghak Rebellion or Donghak Party`s Rebellion` by the socialist camp during the Japanese colonial period. This also seemed to be the general term at that time for the socialist camp. Second, the term "Gabo Revolution" or "Donghak Revolution" was often used as an alternative one for a specific purpose. Donghee Choi used the term Gabo Revolution, however, in the 1920s, Gabo was used instead of Donghak to highlight the periodic and continuous revolutionary activities by Donghak. It was used as a measure to separate the Peasant War and Donghak by replacing the latter term in the 1930s. Third, the socialist camp positioned the Donghak Peasant War as a peasant war or popular movements when analyzing it based on the `theory of religious outer cover` since the 1930s. Nevertheless, there seemed to be various opinions about the actual role of Donghak. Despite the difference in opinion about the role of Donghak, it seemed that the tendency to position a peasant war as a popular or peasant movement persisted until the mid and late 1930s. Fourth, during the Japanese colonial period, the socialist camp focused on anti-feudalism among anti-foreign powers. As anti-feudalism was a characteristic of the Donghak Peasant War, the socialist camp did not pay much attention to it. This is because the socialist camp sought national liberation from imperialism during the Japanese colonial period. Fifth, the change in the recognition of the Donghak Peasant War by the socialist camp was possibly linked to the change in the united front tactics or rise of revolutionism.
제1차 당대회시기 조선공산당의 전남 동부지역 조직과 활동
최선웅(Choi, Sun-woong) 가천대학교 아시아문화연구소 2014 아시아문화연구 Vol.33 No.-
1924년을 전후한 무렵 전남 동부지역,즉 순천을 중심으로 하는 광양, 여수, 구례, 고흥, 보성 등 동부6군을 활동범위로 하는 공산주의그룹이 태동하였다. 순천과 인근 지역 공산주의 그룹에 대해 화요파와 북풍파가 모두 자신의 계통임을 주장하는 상황이었다. 그런 와중에 화요파가 주도하던 조선공산당 창당에 김기수가 순천그룹을 대표해 참석했다. 조선공산당 창당을 계기로 전남 동부지역에는 조공 및 공청의 군 조직이 결성되었다. 하지만 1926년 5월부터 6월 사이 조공 및 고려공산청년회의 전남도기관,순천야체이카 회의 등에서 결정된 사항은 이들이 중앙의 지령을 일방적으로 실현하는 것이 아니라 지역의 사정에 맞추어 자체적으로 운동의 방향과 과제를 선정하고 있었음을 확인할 수 있다. 특히 조공 전남도기관에서는 현재 조공을 둘러싼 분파투쟁을 비판하며 그에 대한 해결책으로 제2차 당대회의 소집을 요구하고 있다. 그리고 당대회가 열리기 전까지는 중앙의 지령을 거부하겠다고 결의했다. In 1924 or so, a communist group grew up, which was active in the eastern part of South Jeolla Province. It was the cell of the domestic division of Korean Bureau, led by Lee Yeong-min. However, when it was organized in Suncheon, there were also Hwayo(Tuesday) Faction and Bukpung(north wind) Faction tendencies in the domestic division. These tendencies were separated in 1924. Then, the both factions insisted communist groups in Suncheon and the surrounding area were of their line. Yet, Kim Gi-su attended as a representative of Suncheon group when the Korean Communist Party(KCP) was formed. And then KCP and Korean Communist Youth Association(KCYA) formed local organizations in the eastern part of South Jeolla Province. But, we can identify through the matters decided in the meetings of organizations of South Jeolla Province and Suncheon cell of KCP and KCYA between May and June, 1926, they didn’t unilaterally realize the order of center, but autonomously selected campaign direction and tasks according to the regional situation. In particular, the organization of South Jeolla Province of KCP condemned factional fight surrounding KCP. And it called for the second party convention to solve the problem. Also, they determined to reject the order of center until the party convention was held.
최선웅(Choi, Sun-woong) 한국인물사연구회 2015 한국인물사연구 Vol.23 No.-
This research aimed at analyzing the theory of movement of Jeong, inbo and Dong-A Ilbo from 1920s to early and mid 1930, checking the agreement between the two, and investigating the development of Jeong, inbo"s "Joseonhak"(Joseon studies) movement therein. It was determined that Dong-A Ilbo and Jeong, inbo formed a steady bond of sympathy on national movement. That could be found in the fact that both of them asserted the development of independent national culture as an urgent problem of national movement, which took Joseon as the unit. In the point that the selected urgent problem was the development of independent national culture based on the same ideological foundation, nationalism, agreement of the two existed. Therefore, Jeong, inbo, who began to make relationship with Dong-A Ilbo from 1924, at the latest, clarified his political opinion through Dong-A Ilbo, as well, utilized it as the major stage of developing Joseonhak movement of 1930s. Jeong, inbo"s study on Joseonhak was progressed by being interconnected with national culture enhancement planning of Dong-A Ilbo. Jeong, inbo serially published a bibliographical introduction of a classical work of Joseon in Dong-A Ilbo, and asserted historic place preservation such as Admiral Yi Sun-sin enhancement project, etc. by receiving Song, jinwoo"s advice. Also, he serially published "Yangmyunghak-yeonron" in Dong-A Ilbo, one of his major achievement in 66 installments. In Dasan commemoration business, the opportunity of regular Joseon studies movement, Jeong, inbo published editorial and thesis in Dong-A Ilbo and conducted commemorative lecture. "Eol-sagwan"(historical view by national spirit), peak of Jeong, inbo"s Joseon studies research, was also published in Dong-A Ilbo. This way, Jeong, inbo"s Joseon studies research was developed through the medium, Dong-A Ilbo. This proved that his Joseonhak movement was developed by being mutually closely interlocked with cultural movement theory of Dong-A Ilbo, accordingly, it is not valid to divide the two into compromise and non-compromise, or left/right nationalism.