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%.

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.

일제시기 사회주의 진영의 동학농민전쟁 인식

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.

식민지 조선에서 일제(日帝)의 전향정책(轉向政策) 도입과 변화 과정

최선웅 ( Sun Woong Choi ) 고려대학교 역사연구소 2014 사총 Vol.81 No.-

Japanese converting policy enforced in colonial Korea can be roughly categorized into 4 stages. First, there is the stage from 1930 to 1933 when converting policy was enforced unofficially. In this stage, converting policy was established in Japan, but in Korea, this policy was enforced unofficially at discretion of first-line site with examination of thinking as the center. Second, there is the stage from 1933 to 1936 when so-called large converting was started and also converting policy was recognized officially in Korea. In this stage, a large converting was started in Japan, and in Korea, erstwhile controversy was calmed and then converting policy was adopted officially with instruction of Chief Prosecutor in a high court of justice in October 1933. Merely, in contrast with Japan, requirement and methods of converting were never specified in the shape of legislation in Korea, and in accordance with the custom, proper steps were taken in stage of questioning political offenders and making political offenders in jail such as non-prosecution disposition such as releasing with a warning and suspension of indictment, probation, and releasing on parole. In the meantime, legislation for converting was prepared systematically by proclamation of Probation Act in December 12th 1936. Third, there is the stage from 1937 to 1940 when national spiritual mobilization was started and ‘change as a thought’ and ‘communal converting’ happened. This time is that ‘change as a thought’ happened in earnest based on converting policy realigned as a system under a war footing after the Sino-Japanese War in July 1937. Aspect of converting varied from converting announcement of individuality or small group to converting of party or organization. Last, there is the stage from 1941 to 1945 when this time had been a series of uniform converting under the national total strength movement and an assistance system. In this stage, uniform converting was forced in the time before and after the outbreak of the Pacific War, so converts in Korea accepted Japanese demand thoroughgoingly and was mobilized. Uniform converting having no the minimum difference converts showed before was established fitting to Japanese ruling logic.

행정소송에서의 석명의무의 인정근거

최선웅(Choi Sun-Woong) 행정법이론실무학회 2003 행정법연구 Vol.- No.10

미국유학시기 張德秀의 비밀결사 활동

최선웅(Choi, Sun-woong) 한국인물사연구회 2013 한국인물사연구 Vol.19 No.-

最近 行政關聯判例 動向

최선웅(Choi, Sun-Woong) 행정법이론실무학회 2011 행정법연구 Vol.- No.31

정인보와 동아일보

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.

행정소송에서의 준용규정에 관한 일 고찰

최선웅(Choi Sun-Woong) 행정법이론실무학회 2004 행정법연구 Vol.- No.12